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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
commit2aa4a82499d4becd2284cdb482213d541b8804dd (patch)
treeb80bf8bf13c3766139fbacc530efd0dd9d54394c /layout/painting/nsCSSRendering.cpp
parentInitial commit. (diff)
downloadfirefox-upstream.tar.xz
firefox-upstream.zip
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/painting/nsCSSRendering.cpp')
-rw-r--r--layout/painting/nsCSSRendering.cpp4903
1 files changed, 4903 insertions, 0 deletions
diff --git a/layout/painting/nsCSSRendering.cpp b/layout/painting/nsCSSRendering.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* utility functions for drawing borders and backgrounds */
+
+#include <ctime>
+
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/ComputedStyle.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Helpers.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/HashFunctions.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/SVGImageContext.h"
+#include "gfxFont.h"
+#include "ScaledFontBase.h"
+#include "skia/include/core/SkTextBlob.h"
+
+#include "BorderConsts.h"
+#include "nsStyleConsts.h"
+#include "nsPresContext.h"
+#include "nsIFrame.h"
+#include "nsIFrameInlines.h"
+#include "nsPoint.h"
+#include "nsRect.h"
+#include "nsFrameManager.h"
+#include "nsGkAtoms.h"
+#include "nsCSSAnonBoxes.h"
+#include "nsIContent.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "nsIScrollableFrame.h"
+#include "imgIContainer.h"
+#include "ImageOps.h"
+#include "nsCSSRendering.h"
+#include "nsCSSColorUtils.h"
+#include "nsITheme.h"
+#include "nsLayoutUtils.h"
+#include "nsBlockFrame.h"
+#include "nsStyleStructInlines.h"
+#include "nsCSSFrameConstructor.h"
+#include "nsCSSProps.h"
+#include "nsContentUtils.h"
+#include "gfxDrawable.h"
+#include "GeckoProfiler.h"
+#include "nsCSSRenderingBorders.h"
+#include "mozilla/css/ImageLoader.h"
+#include "ImageContainer.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/Telemetry.h"
+#include "gfxUtils.h"
+#include "gfxGradientCache.h"
+#include "nsInlineFrame.h"
+#include "nsRubyTextContainerFrame.h"
+#include <algorithm>
+#include "TextDrawTarget.h"
+
+using namespace mozilla;
+using namespace mozilla::css;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+using mozilla::CSSSizeOrRatio;
+using mozilla::dom::Document;
+
+static int gFrameTreeLockCount = 0;
+
+// To avoid storing this data on nsInlineFrame (bloat) and to avoid
+// recalculating this for each frame in a continuation (perf), hold
+// a cache of various coordinate information that we need in order
+// to paint inline backgrounds.
+struct InlineBackgroundData {
+ InlineBackgroundData()
+ : mFrame(nullptr),
+ mLineContainer(nullptr),
+ mContinuationPoint(0),
+ mUnbrokenMeasure(0),
+ mLineContinuationPoint(0),
+ mPIStartBorderData{},
+ mBidiEnabled(false),
+ mVertical(false) {}
+
+ ~InlineBackgroundData() = default;
+
+ void Reset() {
+ mBoundingBox.SetRect(0, 0, 0, 0);
+ mContinuationPoint = mLineContinuationPoint = mUnbrokenMeasure = 0;
+ mFrame = mLineContainer = nullptr;
+ mPIStartBorderData.Reset();
+ }
+
+ /**
+ * Return a continuous rect for (an inline) aFrame relative to the
+ * continuation that draws the left-most part of the background.
+ * This is used when painting backgrounds.
+ */
+ nsRect GetContinuousRect(nsIFrame* aFrame) {
+ MOZ_ASSERT(static_cast<nsInlineFrame*>(do_QueryFrame(aFrame)));
+
+ SetFrame(aFrame);
+
+ nscoord pos; // an x coordinate if writing-mode is horizontal;
+ // y coordinate if vertical
+ if (mBidiEnabled) {
+ pos = mLineContinuationPoint;
+
+ // Scan continuations on the same line as aFrame and accumulate the widths
+ // of frames that are to the left (if this is an LTR block) or right
+ // (if it's RTL) of the current one.
+ bool isRtlBlock = (mLineContainer->StyleVisibility()->mDirection ==
+ StyleDirection::Rtl);
+ nscoord curOffset = mVertical ? aFrame->GetOffsetTo(mLineContainer).y
+ : aFrame->GetOffsetTo(mLineContainer).x;
+
+ // If the continuation is fluid we know inlineFrame is not on the same
+ // line. If it's not fluid, we need to test further to be sure.
+ nsIFrame* inlineFrame = aFrame->GetPrevContinuation();
+ while (inlineFrame && !inlineFrame->GetNextInFlow() &&
+ AreOnSameLine(aFrame, inlineFrame)) {
+ nscoord frameOffset = mVertical
+ ? inlineFrame->GetOffsetTo(mLineContainer).y
+ : inlineFrame->GetOffsetTo(mLineContainer).x;
+ if (isRtlBlock == (frameOffset >= curOffset)) {
+ pos += mVertical ? inlineFrame->GetSize().height
+ : inlineFrame->GetSize().width;
+ }
+ inlineFrame = inlineFrame->GetPrevContinuation();
+ }
+
+ inlineFrame = aFrame->GetNextContinuation();
+ while (inlineFrame && !inlineFrame->GetPrevInFlow() &&
+ AreOnSameLine(aFrame, inlineFrame)) {
+ nscoord frameOffset = mVertical
+ ? inlineFrame->GetOffsetTo(mLineContainer).y
+ : inlineFrame->GetOffsetTo(mLineContainer).x;
+ if (isRtlBlock == (frameOffset >= curOffset)) {
+ pos += mVertical ? inlineFrame->GetSize().height
+ : inlineFrame->GetSize().width;
+ }
+ inlineFrame = inlineFrame->GetNextContinuation();
+ }
+ if (isRtlBlock) {
+ // aFrame itself is also to the right of its left edge, so add its
+ // width.
+ pos += mVertical ? aFrame->GetSize().height : aFrame->GetSize().width;
+ // pos is now the distance from the left [top] edge of aFrame to the
+ // right [bottom] edge of the unbroken content. Change it to indicate
+ // the distance from the left [top] edge of the unbroken content to the
+ // left [top] edge of aFrame.
+ pos = mUnbrokenMeasure - pos;
+ }
+ } else {
+ pos = mContinuationPoint;
+ }
+
+ // Assume background-origin: border and return a rect with offsets
+ // relative to (0,0). If we have a different background-origin,
+ // then our rect should be deflated appropriately by our caller.
+ return mVertical
+ ? nsRect(0, -pos, mFrame->GetSize().width, mUnbrokenMeasure)
+ : nsRect(-pos, 0, mUnbrokenMeasure, mFrame->GetSize().height);
+ }
+
+ /**
+ * Return a continuous rect for (an inline) aFrame relative to the
+ * continuation that should draw the left[top]-border. This is used when
+ * painting borders and clipping backgrounds. This may NOT be the same
+ * continuous rect as for drawing backgrounds; the continuation with the
+ * left[top]-border might be somewhere in the middle of that rect (e.g. BIDI),
+ * in those cases we need the reverse background order starting at the
+ * left[top]-border continuation.
+ */
+ nsRect GetBorderContinuousRect(nsIFrame* aFrame, nsRect aBorderArea) {
+ // Calling GetContinuousRect(aFrame) here may lead to Reset/Init which
+ // resets our mPIStartBorderData so we save it ...
+ PhysicalInlineStartBorderData saved(mPIStartBorderData);
+ nsRect joinedBorderArea = GetContinuousRect(aFrame);
+ if (!saved.mIsValid || saved.mFrame != mPIStartBorderData.mFrame) {
+ if (aFrame == mPIStartBorderData.mFrame) {
+ if (mVertical) {
+ mPIStartBorderData.SetCoord(joinedBorderArea.y);
+ } else {
+ mPIStartBorderData.SetCoord(joinedBorderArea.x);
+ }
+ } else if (mPIStartBorderData.mFrame) {
+ // Copy data to a temporary object so that computing the
+ // continous rect here doesn't clobber our normal state.
+ InlineBackgroundData temp = *this;
+ if (mVertical) {
+ mPIStartBorderData.SetCoord(
+ temp.GetContinuousRect(mPIStartBorderData.mFrame).y);
+ } else {
+ mPIStartBorderData.SetCoord(
+ temp.GetContinuousRect(mPIStartBorderData.mFrame).x);
+ }
+ }
+ } else {
+ // ... and restore it when possible.
+ mPIStartBorderData.SetCoord(saved.mCoord);
+ }
+ if (mVertical) {
+ if (joinedBorderArea.y > mPIStartBorderData.mCoord) {
+ joinedBorderArea.y =
+ -(mUnbrokenMeasure + joinedBorderArea.y - aBorderArea.height);
+ } else {
+ joinedBorderArea.y -= mPIStartBorderData.mCoord;
+ }
+ } else {
+ if (joinedBorderArea.x > mPIStartBorderData.mCoord) {
+ joinedBorderArea.x =
+ -(mUnbrokenMeasure + joinedBorderArea.x - aBorderArea.width);
+ } else {
+ joinedBorderArea.x -= mPIStartBorderData.mCoord;
+ }
+ }
+ return joinedBorderArea;
+ }
+
+ nsRect GetBoundingRect(nsIFrame* aFrame) {
+ SetFrame(aFrame);
+
+ // Move the offsets relative to (0,0) which puts the bounding box into
+ // our coordinate system rather than our parent's. We do this by
+ // moving it the back distance from us to the bounding box.
+ // This also assumes background-origin: border, so our caller will
+ // need to deflate us if needed.
+ nsRect boundingBox(mBoundingBox);
+ nsPoint point = mFrame->GetPosition();
+ boundingBox.MoveBy(-point.x, -point.y);
+
+ return boundingBox;
+ }
+
+ protected:
+ // This is a coordinate on the inline axis, but is not a true logical inline-
+ // coord because it is always measured from left to right (if horizontal) or
+ // from top to bottom (if vertical), ignoring any bidi RTL directionality.
+ // We'll call this "physical inline start", or PIStart for short.
+ struct PhysicalInlineStartBorderData {
+ nsIFrame* mFrame; // the continuation that may have a left-border
+ nscoord mCoord; // cached GetContinuousRect(mFrame).x or .y
+ bool mIsValid; // true if mCoord is valid
+ void Reset() {
+ mFrame = nullptr;
+ mIsValid = false;
+ }
+ void SetCoord(nscoord aCoord) {
+ mCoord = aCoord;
+ mIsValid = true;
+ }
+ };
+
+ nsIFrame* mFrame;
+ nsIFrame* mLineContainer;
+ nsRect mBoundingBox;
+ nscoord mContinuationPoint;
+ nscoord mUnbrokenMeasure;
+ nscoord mLineContinuationPoint;
+ PhysicalInlineStartBorderData mPIStartBorderData;
+ bool mBidiEnabled;
+ bool mVertical;
+
+ void SetFrame(nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame, "Need a frame");
+ NS_ASSERTION(gFrameTreeLockCount > 0,
+ "Can't call this when frame tree is not locked");
+
+ if (aFrame == mFrame) {
+ return;
+ }
+
+ nsIFrame* prevContinuation = GetPrevContinuation(aFrame);
+
+ if (!prevContinuation || mFrame != prevContinuation) {
+ // Ok, we've got the wrong frame. We have to start from scratch.
+ Reset();
+ Init(aFrame);
+ return;
+ }
+
+ // Get our last frame's size and add its width to our continuation
+ // point before we cache the new frame.
+ mContinuationPoint +=
+ mVertical ? mFrame->GetSize().height : mFrame->GetSize().width;
+
+ // If this a new line, update mLineContinuationPoint.
+ if (mBidiEnabled &&
+ (aFrame->GetPrevInFlow() || !AreOnSameLine(mFrame, aFrame))) {
+ mLineContinuationPoint = mContinuationPoint;
+ }
+
+ mFrame = aFrame;
+ }
+
+ nsIFrame* GetPrevContinuation(nsIFrame* aFrame) {
+ nsIFrame* prevCont = aFrame->GetPrevContinuation();
+ if (!prevCont && aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
+ nsIFrame* block = aFrame->GetProperty(nsIFrame::IBSplitPrevSibling());
+ if (block) {
+ // The {ib} properties are only stored on first continuations
+ NS_ASSERTION(!block->GetPrevContinuation(),
+ "Incorrect value for IBSplitPrevSibling");
+ prevCont = block->GetProperty(nsIFrame::IBSplitPrevSibling());
+ NS_ASSERTION(prevCont, "How did that happen?");
+ }
+ }
+ return prevCont;
+ }
+
+ nsIFrame* GetNextContinuation(nsIFrame* aFrame) {
+ nsIFrame* nextCont = aFrame->GetNextContinuation();
+ if (!nextCont && aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
+ // The {ib} properties are only stored on first continuations
+ aFrame = aFrame->FirstContinuation();
+ nsIFrame* block = aFrame->GetProperty(nsIFrame::IBSplitSibling());
+ if (block) {
+ nextCont = block->GetProperty(nsIFrame::IBSplitSibling());
+ NS_ASSERTION(nextCont, "How did that happen?");
+ }
+ }
+ return nextCont;
+ }
+
+ void Init(nsIFrame* aFrame) {
+ mPIStartBorderData.Reset();
+ mBidiEnabled = aFrame->PresContext()->BidiEnabled();
+ if (mBidiEnabled) {
+ // Find the line container frame
+ mLineContainer = aFrame;
+ while (mLineContainer &&
+ mLineContainer->IsFrameOfType(nsIFrame::eLineParticipant)) {
+ mLineContainer = mLineContainer->GetParent();
+ }
+
+ MOZ_ASSERT(mLineContainer, "Cannot find line containing frame.");
+ MOZ_ASSERT(mLineContainer != aFrame,
+ "line container frame "
+ "should be an ancestor of the target frame.");
+ }
+
+ mVertical = aFrame->GetWritingMode().IsVertical();
+
+ // Start with the previous flow frame as our continuation point
+ // is the total of the widths of the previous frames.
+ nsIFrame* inlineFrame = GetPrevContinuation(aFrame);
+ bool changedLines = false;
+ while (inlineFrame) {
+ if (!mPIStartBorderData.mFrame &&
+ !(mVertical ? inlineFrame->GetSkipSides().Top()
+ : inlineFrame->GetSkipSides().Left())) {
+ mPIStartBorderData.mFrame = inlineFrame;
+ }
+ nsRect rect = inlineFrame->GetRect();
+ mContinuationPoint += mVertical ? rect.height : rect.width;
+ if (mBidiEnabled &&
+ (changedLines || !AreOnSameLine(aFrame, inlineFrame))) {
+ mLineContinuationPoint += mVertical ? rect.height : rect.width;
+ changedLines = true;
+ }
+ mUnbrokenMeasure += mVertical ? rect.height : rect.width;
+ mBoundingBox.UnionRect(mBoundingBox, rect);
+ inlineFrame = GetPrevContinuation(inlineFrame);
+ }
+
+ // Next add this frame and subsequent frames to the bounding box and
+ // unbroken width.
+ inlineFrame = aFrame;
+ while (inlineFrame) {
+ if (!mPIStartBorderData.mFrame &&
+ !(mVertical ? inlineFrame->GetSkipSides().Top()
+ : inlineFrame->GetSkipSides().Left())) {
+ mPIStartBorderData.mFrame = inlineFrame;
+ }
+ nsRect rect = inlineFrame->GetRect();
+ mUnbrokenMeasure += mVertical ? rect.height : rect.width;
+ mBoundingBox.UnionRect(mBoundingBox, rect);
+ inlineFrame = GetNextContinuation(inlineFrame);
+ }
+
+ mFrame = aFrame;
+ }
+
+ bool AreOnSameLine(nsIFrame* aFrame1, nsIFrame* aFrame2) {
+ if (nsBlockFrame* blockFrame = do_QueryFrame(mLineContainer)) {
+ bool isValid1, isValid2;
+ nsBlockInFlowLineIterator it1(blockFrame, aFrame1, &isValid1);
+ nsBlockInFlowLineIterator it2(blockFrame, aFrame2, &isValid2);
+ return isValid1 && isValid2 &&
+ // Make sure aFrame1 and aFrame2 are in the same continuation of
+ // blockFrame.
+ it1.GetContainer() == it2.GetContainer() &&
+ // And on the same line in it
+ it1.GetLine().get() == it2.GetLine().get();
+ }
+ if (nsRubyTextContainerFrame* rtcFrame = do_QueryFrame(mLineContainer)) {
+ nsBlockFrame* block = nsLayoutUtils::FindNearestBlockAncestor(rtcFrame);
+ // Ruby text container can only hold one line of text, so if they
+ // are in the same continuation, they are in the same line. Since
+ // ruby text containers are bidi isolate, they are never split for
+ // bidi reordering, which means being in different continuation
+ // indicates being in different lines.
+ for (nsIFrame* frame = rtcFrame->FirstContinuation(); frame;
+ frame = frame->GetNextContinuation()) {
+ bool isDescendant1 =
+ nsLayoutUtils::IsProperAncestorFrame(frame, aFrame1, block);
+ bool isDescendant2 =
+ nsLayoutUtils::IsProperAncestorFrame(frame, aFrame2, block);
+ if (isDescendant1 && isDescendant2) {
+ return true;
+ }
+ if (isDescendant1 || isDescendant2) {
+ return false;
+ }
+ }
+ MOZ_ASSERT_UNREACHABLE("None of the frames is a descendant of this rtc?");
+ }
+ MOZ_ASSERT_UNREACHABLE("Do we have any other type of line container?");
+ return false;
+ }
+};
+
+static InlineBackgroundData* gInlineBGData = nullptr;
+
+// Initialize any static variables used by nsCSSRendering.
+void nsCSSRendering::Init() {
+ NS_ASSERTION(!gInlineBGData, "Init called twice");
+ gInlineBGData = new InlineBackgroundData();
+}
+
+// Clean up any global variables used by nsCSSRendering.
+void nsCSSRendering::Shutdown() {
+ delete gInlineBGData;
+ gInlineBGData = nullptr;
+}
+
+/**
+ * Make a bevel color
+ */
+static nscolor MakeBevelColor(mozilla::Side whichSide, StyleBorderStyle style,
+ nscolor aBorderColor) {
+ nscolor colors[2];
+ nscolor theColor;
+
+ // Given a background color and a border color
+ // calculate the color used for the shading
+ NS_GetSpecial3DColors(colors, aBorderColor);
+
+ if ((style == StyleBorderStyle::Outset) ||
+ (style == StyleBorderStyle::Ridge)) {
+ // Flip colors for these two border styles
+ switch (whichSide) {
+ case eSideBottom:
+ whichSide = eSideTop;
+ break;
+ case eSideRight:
+ whichSide = eSideLeft;
+ break;
+ case eSideTop:
+ whichSide = eSideBottom;
+ break;
+ case eSideLeft:
+ whichSide = eSideRight;
+ break;
+ }
+ }
+
+ switch (whichSide) {
+ case eSideBottom:
+ theColor = colors[1];
+ break;
+ case eSideRight:
+ theColor = colors[1];
+ break;
+ case eSideTop:
+ theColor = colors[0];
+ break;
+ case eSideLeft:
+ default:
+ theColor = colors[0];
+ break;
+ }
+ return theColor;
+}
+
+static bool GetRadii(nsIFrame* aForFrame, const nsStyleBorder& aBorder,
+ const nsRect& aOrigBorderArea, const nsRect& aBorderArea,
+ nscoord aRadii[8]) {
+ bool haveRoundedCorners;
+ nsSize sz = aBorderArea.Size();
+ nsSize frameSize = aForFrame->GetSize();
+ if (&aBorder == aForFrame->StyleBorder() &&
+ frameSize == aOrigBorderArea.Size()) {
+ haveRoundedCorners = aForFrame->GetBorderRadii(sz, sz, Sides(), aRadii);
+ } else {
+ haveRoundedCorners = nsIFrame::ComputeBorderRadii(
+ aBorder.mBorderRadius, frameSize, sz, Sides(), aRadii);
+ }
+
+ return haveRoundedCorners;
+}
+
+static bool GetRadii(nsIFrame* aForFrame, const nsStyleBorder& aBorder,
+ const nsRect& aOrigBorderArea, const nsRect& aBorderArea,
+ RectCornerRadii* aBgRadii) {
+ nscoord radii[8];
+ bool haveRoundedCorners =
+ GetRadii(aForFrame, aBorder, aOrigBorderArea, aBorderArea, radii);
+
+ if (haveRoundedCorners) {
+ auto d2a = aForFrame->PresContext()->AppUnitsPerDevPixel();
+ nsCSSRendering::ComputePixelRadii(radii, d2a, aBgRadii);
+ }
+ return haveRoundedCorners;
+}
+
+static nsRect JoinBoxesForBlockAxisSlice(nsIFrame* aFrame,
+ const nsRect& aBorderArea) {
+ // Inflate the block-axis size as if our continuations were laid out
+ // adjacent in that axis. Note that we don't touch the inline size.
+ const auto wm = aFrame->GetWritingMode();
+ const nsSize dummyContainerSize;
+ LogicalRect borderArea(wm, aBorderArea, dummyContainerSize);
+ nscoord bSize = 0;
+ nsIFrame* f = aFrame->GetNextContinuation();
+ for (; f; f = f->GetNextContinuation()) {
+ bSize += f->BSize(wm);
+ }
+ borderArea.BSize(wm) += bSize;
+ bSize = 0;
+ f = aFrame->GetPrevContinuation();
+ for (; f; f = f->GetPrevContinuation()) {
+ bSize += f->BSize(wm);
+ }
+ borderArea.BStart(wm) -= bSize;
+ borderArea.BSize(wm) += bSize;
+ return borderArea.GetPhysicalRect(wm, dummyContainerSize);
+}
+
+/**
+ * Inflate aBorderArea which is relative to aFrame's origin to calculate
+ * a hypothetical non-split frame area for all the continuations.
+ * See "Joining Boxes for 'slice'" in
+ * http://dev.w3.org/csswg/css-break/#break-decoration
+ */
+enum InlineBoxOrder { eForBorder, eForBackground };
+static nsRect JoinBoxesForSlice(nsIFrame* aFrame, const nsRect& aBorderArea,
+ InlineBoxOrder aOrder) {
+ if (static_cast<nsInlineFrame*>(do_QueryFrame(aFrame))) {
+ return (aOrder == eForBorder
+ ? gInlineBGData->GetBorderContinuousRect(aFrame, aBorderArea)
+ : gInlineBGData->GetContinuousRect(aFrame)) +
+ aBorderArea.TopLeft();
+ }
+ return JoinBoxesForBlockAxisSlice(aFrame, aBorderArea);
+}
+
+/* static */
+bool nsCSSRendering::IsBoxDecorationSlice(const nsStyleBorder& aStyleBorder) {
+ return aStyleBorder.mBoxDecorationBreak == StyleBoxDecorationBreak::Slice;
+}
+
+/* static */
+nsRect nsCSSRendering::BoxDecorationRectForBorder(
+ nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
+ const nsStyleBorder* aStyleBorder) {
+ if (!aStyleBorder) {
+ aStyleBorder = aFrame->StyleBorder();
+ }
+ // If aSkipSides.IsEmpty() then there are no continuations, or it's
+ // a ::first-letter that wants all border sides on the first continuation.
+ return IsBoxDecorationSlice(*aStyleBorder) && !aSkipSides.IsEmpty()
+ ? ::JoinBoxesForSlice(aFrame, aBorderArea, eForBorder)
+ : aBorderArea;
+}
+
+/* static */
+nsRect nsCSSRendering::BoxDecorationRectForBackground(
+ nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
+ const nsStyleBorder* aStyleBorder) {
+ if (!aStyleBorder) {
+ aStyleBorder = aFrame->StyleBorder();
+ }
+ // If aSkipSides.IsEmpty() then there are no continuations, or it's
+ // a ::first-letter that wants all border sides on the first continuation.
+ return IsBoxDecorationSlice(*aStyleBorder) && !aSkipSides.IsEmpty()
+ ? ::JoinBoxesForSlice(aFrame, aBorderArea, eForBackground)
+ : aBorderArea;
+}
+
+//----------------------------------------------------------------------
+// Thebes Border Rendering Code Start
+
+/*
+ * Compute the float-pixel radii that should be used for drawing
+ * this border/outline, given the various input bits.
+ */
+/* static */
+void nsCSSRendering::ComputePixelRadii(const nscoord* aAppUnitsRadii,
+ nscoord aAppUnitsPerPixel,
+ RectCornerRadii* oBorderRadii) {
+ Float radii[8];
+ for (const auto corner : mozilla::AllPhysicalHalfCorners()) {
+ radii[corner] = Float(aAppUnitsRadii[corner]) / aAppUnitsPerPixel;
+ }
+
+ (*oBorderRadii)[C_TL] = Size(radii[eCornerTopLeftX], radii[eCornerTopLeftY]);
+ (*oBorderRadii)[C_TR] =
+ Size(radii[eCornerTopRightX], radii[eCornerTopRightY]);
+ (*oBorderRadii)[C_BR] =
+ Size(radii[eCornerBottomRightX], radii[eCornerBottomRightY]);
+ (*oBorderRadii)[C_BL] =
+ Size(radii[eCornerBottomLeftX], radii[eCornerBottomLeftY]);
+}
+
+static Maybe<nsStyleBorder> GetBorderIfVisited(const ComputedStyle& aStyle) {
+ Maybe<nsStyleBorder> result;
+ // Don't check RelevantLinkVisited here, since we want to take the
+ // same amount of time whether or not it's true.
+ const ComputedStyle* styleIfVisited = aStyle.GetStyleIfVisited();
+ if (MOZ_LIKELY(!styleIfVisited)) {
+ return result;
+ }
+
+ result.emplace(*aStyle.StyleBorder());
+ auto& newBorder = result.ref();
+ for (const auto side : mozilla::AllPhysicalSides()) {
+ nscolor color = aStyle.GetVisitedDependentColor(
+ nsStyleBorder::BorderColorFieldFor(side));
+ newBorder.BorderColorFor(side) = StyleColor::FromColor(color);
+ }
+
+ return result;
+}
+
+ImgDrawResult nsCSSRendering::PaintBorder(
+ nsPresContext* aPresContext, gfxContext& aRenderingContext,
+ nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ ComputedStyle* aStyle, PaintBorderFlags aFlags, Sides aSkipSides) {
+ AUTO_PROFILER_LABEL("nsCSSRendering::PaintBorder", GRAPHICS);
+
+ Maybe<nsStyleBorder> visitedBorder = GetBorderIfVisited(*aStyle);
+ return PaintBorderWithStyleBorder(
+ aPresContext, aRenderingContext, aForFrame, aDirtyRect, aBorderArea,
+ visitedBorder.refOr(*aStyle->StyleBorder()), aStyle, aFlags, aSkipSides);
+}
+
+Maybe<nsCSSBorderRenderer> nsCSSRendering::CreateBorderRenderer(
+ nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
+ const nsRect& aDirtyRect, const nsRect& aBorderArea, ComputedStyle* aStyle,
+ bool* aOutBorderIsEmpty, Sides aSkipSides) {
+ Maybe<nsStyleBorder> visitedBorder = GetBorderIfVisited(*aStyle);
+ return CreateBorderRendererWithStyleBorder(
+ aPresContext, aDrawTarget, aForFrame, aDirtyRect, aBorderArea,
+ visitedBorder.refOr(*aStyle->StyleBorder()), aStyle, aOutBorderIsEmpty,
+ aSkipSides);
+}
+
+ImgDrawResult nsCSSRendering::CreateWebRenderCommandsForBorder(
+ nsDisplayItem* aItem, nsIFrame* aForFrame, const nsRect& aBorderArea,
+ mozilla::wr::DisplayListBuilder& aBuilder,
+ mozilla::wr::IpcResourceUpdateQueue& aResources,
+ const mozilla::layers::StackingContextHelper& aSc,
+ mozilla::layers::RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder) {
+ const auto* style = aForFrame->Style();
+ Maybe<nsStyleBorder> visitedBorder = GetBorderIfVisited(*style);
+ return nsCSSRendering::CreateWebRenderCommandsForBorderWithStyleBorder(
+ aItem, aForFrame, aBorderArea, aBuilder, aResources, aSc, aManager,
+ aDisplayListBuilder, visitedBorder.refOr(*style->StyleBorder()));
+}
+
+void nsCSSRendering::CreateWebRenderCommandsForNullBorder(
+ nsDisplayItem* aItem, nsIFrame* aForFrame, const nsRect& aBorderArea,
+ mozilla::wr::DisplayListBuilder& aBuilder,
+ mozilla::wr::IpcResourceUpdateQueue& aResources,
+ const mozilla::layers::StackingContextHelper& aSc,
+ const nsStyleBorder& aStyleBorder) {
+ bool borderIsEmpty = false;
+ Maybe<nsCSSBorderRenderer> br =
+ nsCSSRendering::CreateNullBorderRendererWithStyleBorder(
+ aForFrame->PresContext(), nullptr, aForFrame, nsRect(), aBorderArea,
+ aStyleBorder, aForFrame->Style(), &borderIsEmpty,
+ aForFrame->GetSkipSides());
+ if (!borderIsEmpty && br) {
+ br->CreateWebRenderCommands(aItem, aBuilder, aResources, aSc);
+ }
+}
+
+ImgDrawResult nsCSSRendering::CreateWebRenderCommandsForBorderWithStyleBorder(
+ nsDisplayItem* aItem, nsIFrame* aForFrame, const nsRect& aBorderArea,
+ mozilla::wr::DisplayListBuilder& aBuilder,
+ mozilla::wr::IpcResourceUpdateQueue& aResources,
+ const mozilla::layers::StackingContextHelper& aSc,
+ mozilla::layers::RenderRootStateManager* aManager,
+ nsDisplayListBuilder* aDisplayListBuilder,
+ const nsStyleBorder& aStyleBorder) {
+ auto& borderImage = aStyleBorder.mBorderImageSource;
+ // First try to create commands for simple borders.
+ if (borderImage.IsNone()) {
+ CreateWebRenderCommandsForNullBorder(
+ aItem, aForFrame, aBorderArea, aBuilder, aResources, aSc, aStyleBorder);
+ return ImgDrawResult::SUCCESS;
+ }
+
+ // Next we try image and gradient borders. Gradients are not supported at
+ // this very moment.
+ if (!borderImage.IsImageRequestType()) {
+ return ImgDrawResult::NOT_SUPPORTED;
+ }
+
+ if (aStyleBorder.mBorderImageRepeatH == StyleBorderImageRepeat::Space ||
+ aStyleBorder.mBorderImageRepeatV == StyleBorderImageRepeat::Space) {
+ return ImgDrawResult::NOT_SUPPORTED;
+ }
+
+ uint32_t flags = 0;
+ if (aDisplayListBuilder->IsPaintingToWindow()) {
+ flags |= nsImageRenderer::FLAG_PAINTING_TO_WINDOW;
+ }
+ if (aDisplayListBuilder->ShouldSyncDecodeImages()) {
+ flags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
+ }
+
+ image::ImgDrawResult result;
+ Maybe<nsCSSBorderImageRenderer> bir =
+ nsCSSBorderImageRenderer::CreateBorderImageRenderer(
+ aForFrame->PresContext(), aForFrame, aBorderArea, aStyleBorder,
+ aItem->GetPaintRect(), aForFrame->GetSkipSides(), flags, &result);
+
+ if (!bir) {
+ // We aren't ready. Try to fallback to the null border image if present but
+ // return the draw result for the border image renderer.
+ CreateWebRenderCommandsForNullBorder(
+ aItem, aForFrame, aBorderArea, aBuilder, aResources, aSc, aStyleBorder);
+ return result;
+ }
+
+ return bir->CreateWebRenderCommands(aItem, aForFrame, aBuilder, aResources,
+ aSc, aManager, aDisplayListBuilder);
+}
+
+static nsCSSBorderRenderer ConstructBorderRenderer(
+ nsPresContext* aPresContext, ComputedStyle* aStyle, DrawTarget* aDrawTarget,
+ nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ const nsStyleBorder& aStyleBorder, Sides aSkipSides, bool* aNeedsClip) {
+ nsMargin border = aStyleBorder.GetComputedBorder();
+
+ // Compute the outermost boundary of the area that might be painted.
+ // Same coordinate space as aBorderArea & aBGClipRect.
+ nsRect joinedBorderArea = nsCSSRendering::BoxDecorationRectForBorder(
+ aForFrame, aBorderArea, aSkipSides, &aStyleBorder);
+ RectCornerRadii bgRadii;
+ ::GetRadii(aForFrame, aStyleBorder, aBorderArea, joinedBorderArea, &bgRadii);
+
+ PrintAsFormatString(" joinedBorderArea: %d %d %d %d\n", joinedBorderArea.x,
+ joinedBorderArea.y, joinedBorderArea.width,
+ joinedBorderArea.height);
+
+ // start drawing
+ if (nsCSSRendering::IsBoxDecorationSlice(aStyleBorder)) {
+ if (joinedBorderArea.IsEqualEdges(aBorderArea)) {
+ // No need for a clip, just skip the sides we don't want.
+ border.ApplySkipSides(aSkipSides);
+ } else {
+ // We're drawing borders around the joined continuation boxes so we need
+ // to clip that to the slice that we want for this frame.
+ *aNeedsClip = true;
+ }
+ } else {
+ MOZ_ASSERT(joinedBorderArea.IsEqualEdges(aBorderArea),
+ "Should use aBorderArea for box-decoration-break:clone");
+ MOZ_ASSERT(
+ aForFrame->GetSkipSides().IsEmpty() ||
+ aForFrame->IsTrueOverflowContainer() ||
+ aForFrame->IsColumnSetFrame(), // a little broader than column-rule
+ "Should not skip sides for box-decoration-break:clone except "
+ "::first-letter/line continuations or other frame types that "
+ "don't have borders but those shouldn't reach this point. "
+ "Overflow containers do reach this point though, as does "
+ "column-rule drawing (which always involves a columnset).");
+ border.ApplySkipSides(aSkipSides);
+ }
+
+ // Convert to dev pixels.
+ nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
+ Rect joinedBorderAreaPx = NSRectToRect(joinedBorderArea, oneDevPixel);
+ Float borderWidths[4] = {
+ Float(border.top) / oneDevPixel, Float(border.right) / oneDevPixel,
+ Float(border.bottom) / oneDevPixel, Float(border.left) / oneDevPixel};
+ Rect dirtyRect = NSRectToRect(aDirtyRect, oneDevPixel);
+
+ StyleBorderStyle borderStyles[4];
+ nscolor borderColors[4];
+
+ // pull out styles, colors
+ for (const auto i : mozilla::AllPhysicalSides()) {
+ borderStyles[i] = aStyleBorder.GetBorderStyle(i);
+ borderColors[i] = aStyleBorder.BorderColorFor(i).CalcColor(*aStyle);
+ }
+
+ PrintAsFormatString(
+ " borderStyles: %d %d %d %d\n", static_cast<int>(borderStyles[0]),
+ static_cast<int>(borderStyles[1]), static_cast<int>(borderStyles[2]),
+ static_cast<int>(borderStyles[3]));
+
+ Document* document = nullptr;
+ nsIContent* content = aForFrame->GetContent();
+ if (content) {
+ document = content->OwnerDoc();
+ }
+
+ return nsCSSBorderRenderer(
+ aPresContext, document, aDrawTarget, dirtyRect, joinedBorderAreaPx,
+ borderStyles, borderWidths, bgRadii, borderColors,
+ !aForFrame->BackfaceIsHidden(),
+ *aNeedsClip ? Some(NSRectToRect(aBorderArea, oneDevPixel)) : Nothing());
+}
+
+ImgDrawResult nsCSSRendering::PaintBorderWithStyleBorder(
+ nsPresContext* aPresContext, gfxContext& aRenderingContext,
+ nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ const nsStyleBorder& aStyleBorder, ComputedStyle* aStyle,
+ PaintBorderFlags aFlags, Sides aSkipSides) {
+ DrawTarget& aDrawTarget = *aRenderingContext.GetDrawTarget();
+
+ PrintAsStringNewline("++ PaintBorder");
+
+ // Check to see if we have an appearance defined. If so, we let the theme
+ // renderer draw the border. DO not get the data from aForFrame, since the
+ // passed in ComputedStyle may be different! Always use |aStyle|!
+ StyleAppearance appearance = aStyle->StyleDisplay()->EffectiveAppearance();
+ if (appearance != StyleAppearance::None) {
+ nsITheme* theme = aPresContext->Theme();
+ if (theme->ThemeSupportsWidget(aPresContext, aForFrame, appearance)) {
+ return ImgDrawResult::SUCCESS; // Let the theme handle it.
+ }
+ }
+
+ if (!aStyleBorder.mBorderImageSource.IsNone()) {
+ ImgDrawResult result = ImgDrawResult::SUCCESS;
+
+ uint32_t irFlags = 0;
+ if (aFlags & PaintBorderFlags::SyncDecodeImages) {
+ irFlags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
+ }
+
+ // Creating the border image renderer will request a decode, and we rely on
+ // that happening.
+ Maybe<nsCSSBorderImageRenderer> renderer =
+ nsCSSBorderImageRenderer::CreateBorderImageRenderer(
+ aPresContext, aForFrame, aBorderArea, aStyleBorder, aDirtyRect,
+ aSkipSides, irFlags, &result);
+ // renderer was created successfully, which means border image is ready to
+ // be used.
+ if (renderer) {
+ MOZ_ASSERT(result == ImgDrawResult::SUCCESS);
+ return renderer->DrawBorderImage(aPresContext, aRenderingContext,
+ aForFrame, aDirtyRect);
+ }
+ }
+
+ ImgDrawResult result = ImgDrawResult::SUCCESS;
+
+ // If we had a border-image, but it wasn't loaded, then we should return
+ // ImgDrawResult::NOT_READY; we'll want to try again if we do a paint with
+ // sync decoding enabled.
+ if (!aStyleBorder.mBorderImageSource.IsNone()) {
+ result = ImgDrawResult::NOT_READY;
+ }
+
+ nsMargin border = aStyleBorder.GetComputedBorder();
+ if (0 == border.left && 0 == border.right && 0 == border.top &&
+ 0 == border.bottom) {
+ // Empty border area
+ return result;
+ }
+
+ bool needsClip = false;
+ nsCSSBorderRenderer br = ConstructBorderRenderer(
+ aPresContext, aStyle, &aDrawTarget, aForFrame, aDirtyRect, aBorderArea,
+ aStyleBorder, aSkipSides, &needsClip);
+ if (needsClip) {
+ aDrawTarget.PushClipRect(NSRectToSnappedRect(
+ aBorderArea, aForFrame->PresContext()->AppUnitsPerDevPixel(),
+ aDrawTarget));
+ }
+
+ br.DrawBorders();
+
+ if (needsClip) {
+ aDrawTarget.PopClip();
+ }
+
+ PrintAsStringNewline();
+
+ return result;
+}
+
+Maybe<nsCSSBorderRenderer> nsCSSRendering::CreateBorderRendererWithStyleBorder(
+ nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
+ const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ const nsStyleBorder& aStyleBorder, ComputedStyle* aStyle,
+ bool* aOutBorderIsEmpty, Sides aSkipSides) {
+ if (!aStyleBorder.mBorderImageSource.IsNone()) {
+ return Nothing();
+ }
+ return CreateNullBorderRendererWithStyleBorder(
+ aPresContext, aDrawTarget, aForFrame, aDirtyRect, aBorderArea,
+ aStyleBorder, aStyle, aOutBorderIsEmpty, aSkipSides);
+}
+
+Maybe<nsCSSBorderRenderer>
+nsCSSRendering::CreateNullBorderRendererWithStyleBorder(
+ nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
+ const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ const nsStyleBorder& aStyleBorder, ComputedStyle* aStyle,
+ bool* aOutBorderIsEmpty, Sides aSkipSides) {
+ StyleAppearance appearance = aStyle->StyleDisplay()->EffectiveAppearance();
+ if (appearance != StyleAppearance::None) {
+ nsITheme* theme = aPresContext->Theme();
+ if (theme->ThemeSupportsWidget(aPresContext, aForFrame, appearance)) {
+ return Nothing();
+ }
+ }
+
+ nsMargin border = aStyleBorder.GetComputedBorder();
+ if (0 == border.left && 0 == border.right && 0 == border.top &&
+ 0 == border.bottom) {
+ // Empty border area
+ if (aOutBorderIsEmpty) {
+ *aOutBorderIsEmpty = true;
+ }
+ return Nothing();
+ }
+
+ bool needsClip = false;
+ nsCSSBorderRenderer br = ConstructBorderRenderer(
+ aPresContext, aStyle, aDrawTarget, aForFrame, aDirtyRect, aBorderArea,
+ aStyleBorder, aSkipSides, &needsClip);
+ return Some(br);
+}
+
+static nsRect GetOutlineInnerRect(nsIFrame* aFrame) {
+ nsRect* savedOutlineInnerRect =
+ aFrame->GetProperty(nsIFrame::OutlineInnerRectProperty());
+ if (savedOutlineInnerRect) {
+ return *savedOutlineInnerRect;
+ }
+
+ // FIXME bug 1221888
+ NS_ERROR("we should have saved a frame property");
+ return nsRect(nsPoint(0, 0), aFrame->GetSize());
+}
+
+Maybe<nsCSSBorderRenderer> nsCSSRendering::CreateBorderRendererForOutline(
+ nsPresContext* aPresContext, gfxContext* aRenderingContext,
+ nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
+ ComputedStyle* aStyle) {
+ nscoord twipsRadii[8];
+
+ // Get our ComputedStyle's color struct.
+ const nsStyleOutline* ourOutline = aStyle->StyleOutline();
+
+ if (!ourOutline->ShouldPaintOutline()) {
+ // Empty outline
+ return Nothing();
+ }
+
+ nsRect innerRect;
+ if (
+#ifdef MOZ_XUL
+ aStyle->GetPseudoType() == PseudoStyleType::XULTree
+#else
+ false
+#endif
+ ) {
+ innerRect = aBorderArea;
+ } else {
+ innerRect = GetOutlineInnerRect(aForFrame) + aBorderArea.TopLeft();
+ }
+ nscoord offset = ourOutline->mOutlineOffset.ToAppUnits();
+ innerRect.Inflate(offset);
+ // If the dirty rect is completely inside the border area (e.g., only the
+ // content is being painted), then we can skip out now
+ // XXX this isn't exactly true for rounded borders, where the inside curves
+ // may encroach into the content area. A safer calculation would be to
+ // shorten insideRect by the radius one each side before performing this test.
+ if (innerRect.Contains(aDirtyRect)) return Nothing();
+
+ nscoord width = ourOutline->GetOutlineWidth();
+
+ nsRect outerRect = innerRect;
+ outerRect.Inflate(width);
+
+ // get the radius for our outline
+ nsIFrame::ComputeBorderRadii(ourOutline->mOutlineRadius, aBorderArea.Size(),
+ outerRect.Size(), Sides(), twipsRadii);
+
+ // Get our conversion values
+ nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
+
+ // get the outer rectangles
+ Rect oRect(NSRectToRect(outerRect, oneDevPixel));
+
+ // convert the radii
+ nsMargin outlineMargin(width, width, width, width);
+ RectCornerRadii outlineRadii;
+ ComputePixelRadii(twipsRadii, oneDevPixel, &outlineRadii);
+
+ StyleBorderStyle outlineStyle;
+ if (ourOutline->mOutlineStyle.IsAuto()) {
+ if (StaticPrefs::layout_css_outline_style_auto_enabled()) {
+ nsITheme* theme = aPresContext->Theme();
+ if (theme->ThemeSupportsWidget(aPresContext, aForFrame,
+ StyleAppearance::FocusOutline)) {
+ theme->DrawWidgetBackground(aRenderingContext, aForFrame,
+ StyleAppearance::FocusOutline, innerRect,
+ aDirtyRect);
+ return Nothing();
+ }
+ }
+ if (width == 0) {
+ return Nothing(); // empty outline
+ }
+ // http://dev.w3.org/csswg/css-ui/#outline
+ // "User agents may treat 'auto' as 'solid'."
+ outlineStyle = StyleBorderStyle::Solid;
+ } else {
+ outlineStyle = ourOutline->mOutlineStyle.AsBorderStyle();
+ }
+
+ StyleBorderStyle outlineStyles[4] = {outlineStyle, outlineStyle, outlineStyle,
+ outlineStyle};
+
+ // This handles treating the initial color as 'currentColor'; if we
+ // ever want 'invert' back we'll need to do a bit of work here too.
+ nscolor outlineColor =
+ aStyle->GetVisitedDependentColor(&nsStyleOutline::mOutlineColor);
+ nscolor outlineColors[4] = {outlineColor, outlineColor, outlineColor,
+ outlineColor};
+
+ // convert the border widths
+ Float outlineWidths[4] = {
+ Float(width) / oneDevPixel, Float(width) / oneDevPixel,
+ Float(width) / oneDevPixel, Float(width) / oneDevPixel};
+ Rect dirtyRect = NSRectToRect(aDirtyRect, oneDevPixel);
+
+ Document* document = nullptr;
+ nsIContent* content = aForFrame->GetContent();
+ if (content) {
+ document = content->OwnerDoc();
+ }
+
+ DrawTarget* dt =
+ aRenderingContext ? aRenderingContext->GetDrawTarget() : nullptr;
+ nsCSSBorderRenderer br(aPresContext, document, dt, dirtyRect, oRect,
+ outlineStyles, outlineWidths, outlineRadii,
+ outlineColors, !aForFrame->BackfaceIsHidden(),
+ Nothing());
+
+ return Some(br);
+}
+
+void nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
+ gfxContext& aRenderingContext,
+ nsIFrame* aForFrame, const nsRect& aDirtyRect,
+ const nsRect& aBorderArea,
+ ComputedStyle* aStyle) {
+ Maybe<nsCSSBorderRenderer> br = CreateBorderRendererForOutline(
+ aPresContext, &aRenderingContext, aForFrame, aDirtyRect, aBorderArea,
+ aStyle);
+ if (!br) {
+ return;
+ }
+
+ // start drawing
+ br->DrawBorders();
+
+ PrintAsStringNewline();
+}
+
+void nsCSSRendering::PaintFocus(nsPresContext* aPresContext,
+ DrawTarget* aDrawTarget,
+ const nsRect& aFocusRect, nscolor aColor) {
+ nscoord oneCSSPixel = nsPresContext::CSSPixelsToAppUnits(1);
+ nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
+
+ Rect focusRect(NSRectToRect(aFocusRect, oneDevPixel));
+
+ RectCornerRadii focusRadii;
+ {
+ nscoord twipsRadii[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+ ComputePixelRadii(twipsRadii, oneDevPixel, &focusRadii);
+ }
+ Float focusWidths[4] = {
+ Float(oneCSSPixel) / oneDevPixel, Float(oneCSSPixel) / oneDevPixel,
+ Float(oneCSSPixel) / oneDevPixel, Float(oneCSSPixel) / oneDevPixel};
+
+ StyleBorderStyle focusStyles[4] = {
+ StyleBorderStyle::Dotted, StyleBorderStyle::Dotted,
+ StyleBorderStyle::Dotted, StyleBorderStyle::Dotted};
+ nscolor focusColors[4] = {aColor, aColor, aColor, aColor};
+
+ // Because this renders a dotted border, the background color
+ // should not be used. Therefore, we provide a value that will
+ // be blatantly wrong if it ever does get used. (If this becomes
+ // something that CSS can style, this function will then have access
+ // to a ComputedStyle and can use the same logic that PaintBorder
+ // and PaintOutline do.)
+ //
+ // WebRender layers-free mode don't use PaintFocus function. Just assign
+ // the backface-visibility to true for this case.
+ nsCSSBorderRenderer br(aPresContext, nullptr, aDrawTarget, focusRect,
+ focusRect, focusStyles, focusWidths, focusRadii,
+ focusColors, true, Nothing());
+ br.DrawBorders();
+
+ PrintAsStringNewline();
+}
+
+// Thebes Border Rendering Code End
+//----------------------------------------------------------------------
+
+//----------------------------------------------------------------------
+
+/**
+ * Helper for ComputeObjectAnchorPoint; parameters are the same as for
+ * that function, except they're for a single coordinate / a single size
+ * dimension. (so, x/width vs. y/height)
+ */
+static void ComputeObjectAnchorCoord(const LengthPercentage& aCoord,
+ const nscoord aOriginBounds,
+ const nscoord aImageSize,
+ nscoord* aTopLeftCoord,
+ nscoord* aAnchorPointCoord) {
+ nscoord extraSpace = aOriginBounds - aImageSize;
+
+ // The anchor-point doesn't care about our image's size; just the size
+ // of the region we're rendering into.
+ *aAnchorPointCoord = aCoord.Resolve(aOriginBounds, NSToCoordRoundWithClamp);
+ // Adjust aTopLeftCoord by the specified % of the extra space.
+ *aTopLeftCoord = aCoord.Resolve(extraSpace, NSToCoordRoundWithClamp);
+}
+
+void nsImageRenderer::ComputeObjectAnchorPoint(const Position& aPos,
+ const nsSize& aOriginBounds,
+ const nsSize& aImageSize,
+ nsPoint* aTopLeft,
+ nsPoint* aAnchorPoint) {
+ ComputeObjectAnchorCoord(aPos.horizontal, aOriginBounds.width,
+ aImageSize.width, &aTopLeft->x, &aAnchorPoint->x);
+
+ ComputeObjectAnchorCoord(aPos.vertical, aOriginBounds.height,
+ aImageSize.height, &aTopLeft->y, &aAnchorPoint->y);
+}
+
+nsIFrame* nsCSSRendering::FindNonTransparentBackgroundFrame(
+ nsIFrame* aFrame, bool aStartAtParent /*= false*/) {
+ NS_ASSERTION(aFrame,
+ "Cannot find NonTransparentBackgroundFrame in a null frame");
+
+ nsIFrame* frame = nullptr;
+ if (aStartAtParent) {
+ frame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
+ }
+ if (!frame) {
+ frame = aFrame;
+ }
+
+ while (frame) {
+ // No need to call GetVisitedDependentColor because it always uses
+ // this alpha component anyway.
+ if (NS_GET_A(frame->StyleBackground()->BackgroundColor(frame)) > 0) {
+ break;
+ }
+
+ if (frame->IsThemed()) {
+ break;
+ }
+
+ nsIFrame* parent = nsLayoutUtils::GetParentOrPlaceholderFor(frame);
+ if (!parent) {
+ break;
+ }
+
+ frame = parent;
+ }
+ return frame;
+}
+
+// Returns true if aFrame is a canvas frame.
+// We need to treat the viewport as canvas because, even though
+// it does not actually paint a background, we need to get the right
+// background style so we correctly detect transparent documents.
+bool nsCSSRendering::IsCanvasFrame(const nsIFrame* aFrame) {
+ LayoutFrameType frameType = aFrame->Type();
+ return frameType == LayoutFrameType::Canvas ||
+ frameType == LayoutFrameType::XULRoot ||
+ frameType == LayoutFrameType::PageContent ||
+ frameType == LayoutFrameType::Viewport;
+}
+
+nsIFrame* nsCSSRendering::FindBackgroundStyleFrame(nsIFrame* aForFrame) {
+ const nsStyleBackground* result = aForFrame->StyleBackground();
+
+ // Check if we need to do propagation from BODY rather than HTML.
+ if (!result->IsTransparent(aForFrame)) {
+ return aForFrame;
+ }
+
+ nsIContent* content = aForFrame->GetContent();
+ // The root element content can't be null. We wouldn't know what
+ // frame to create for aFrame.
+ // Use |OwnerDoc| so it works during destruction.
+ if (!content) {
+ return aForFrame;
+ }
+
+ Document* document = content->OwnerDoc();
+
+ dom::Element* bodyContent = document->GetBodyElement();
+ // We need to null check the body node (bug 118829) since
+ // there are cases, thanks to the fix for bug 5569, where we
+ // will reflow a document with no body. In particular, if a
+ // SCRIPT element in the head blocks the parser and then has a
+ // SCRIPT that does "document.location.href = 'foo'", then
+ // nsParser::Terminate will call |DidBuildModel| methods
+ // through to the content sink, which will call |StartLayout|
+ // and thus |Initialize| on the pres shell. See bug 119351
+ // for the ugly details.
+ if (!bodyContent) {
+ return aForFrame;
+ }
+
+ nsIFrame* bodyFrame = bodyContent->GetPrimaryFrame();
+ if (!bodyFrame) {
+ return aForFrame;
+ }
+
+ return nsLayoutUtils::GetStyleFrame(bodyFrame);
+}
+
+/**
+ * |FindBackground| finds the correct style data to use to paint the
+ * background. It is responsible for handling the following two
+ * statements in section 14.2 of CSS2:
+ *
+ * The background of the box generated by the root element covers the
+ * entire canvas.
+ *
+ * For HTML documents, however, we recommend that authors specify the
+ * background for the BODY element rather than the HTML element. User
+ * agents should observe the following precedence rules to fill in the
+ * background: if the value of the 'background' property for the HTML
+ * element is different from 'transparent' then use it, else use the
+ * value of the 'background' property for the BODY element. If the
+ * resulting value is 'transparent', the rendering is undefined.
+ *
+ * Thus, in our implementation, it is responsible for ensuring that:
+ * + we paint the correct background on the |nsCanvasFrame|,
+ * |nsRootBoxFrame|, or |nsPageFrame|,
+ * + we don't paint the background on the root element, and
+ * + we don't paint the background on the BODY element in *some* cases,
+ * and for SGML-based HTML documents only.
+ *
+ * |FindBackground| returns true if a background should be painted, and
+ * the resulting ComputedStyle to use for the background information
+ * will be filled in to |aBackground|.
+ */
+ComputedStyle* nsCSSRendering::FindRootFrameBackground(nsIFrame* aForFrame) {
+ return FindBackgroundStyleFrame(aForFrame)->Style();
+}
+
+inline bool FindElementBackground(const nsIFrame* aForFrame,
+ nsIFrame* aRootElementFrame) {
+ if (aForFrame == aRootElementFrame) {
+ // We must have propagated our background to the viewport or canvas. Abort.
+ return false;
+ }
+
+ // Return true unless the frame is for a BODY element whose background
+ // was propagated to the viewport.
+
+ nsIContent* content = aForFrame->GetContent();
+ if (!content || content->NodeInfo()->NameAtom() != nsGkAtoms::body)
+ return true; // not frame for a "body" element
+ // It could be a non-HTML "body" element but that's OK, we'd fail the
+ // bodyContent check below
+
+ if (aForFrame->Style()->GetPseudoType() != PseudoStyleType::NotPseudo) {
+ return true; // A pseudo-element frame.
+ }
+
+ // We should only look at the <html> background if we're in an HTML document
+ Document* document = content->OwnerDoc();
+
+ dom::Element* bodyContent = document->GetBodyElement();
+ if (bodyContent != content)
+ return true; // this wasn't the background that was propagated
+
+ // This can be called even when there's no root element yet, during frame
+ // construction, via nsLayoutUtils::FrameHasTransparency and
+ // nsContainerFrame::SyncFrameViewProperties.
+ if (!aRootElementFrame) {
+ return true;
+ }
+
+ const nsStyleBackground* htmlBG = aRootElementFrame->StyleBackground();
+ return !htmlBG->IsTransparent(aRootElementFrame);
+}
+
+bool nsCSSRendering::FindBackgroundFrame(const nsIFrame* aForFrame,
+ nsIFrame** aBackgroundFrame) {
+ nsIFrame* rootElementFrame =
+ aForFrame->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
+ if (IsCanvasFrame(aForFrame)) {
+ *aBackgroundFrame = FindCanvasBackgroundFrame(aForFrame, rootElementFrame);
+ return true;
+ }
+
+ *aBackgroundFrame = const_cast<nsIFrame*>(aForFrame);
+ return FindElementBackground(aForFrame, rootElementFrame);
+}
+
+bool nsCSSRendering::FindBackground(const nsIFrame* aForFrame,
+ ComputedStyle** aBackgroundSC) {
+ nsIFrame* backgroundFrame = nullptr;
+ if (FindBackgroundFrame(aForFrame, &backgroundFrame)) {
+ *aBackgroundSC = backgroundFrame->Style();
+ return true;
+ }
+ return false;
+}
+
+void nsCSSRendering::BeginFrameTreesLocked() { ++gFrameTreeLockCount; }
+
+void nsCSSRendering::EndFrameTreesLocked() {
+ NS_ASSERTION(gFrameTreeLockCount > 0, "Unbalanced EndFrameTreeLocked");
+ --gFrameTreeLockCount;
+ if (gFrameTreeLockCount == 0) {
+ gInlineBGData->Reset();
+ }
+}
+
+bool nsCSSRendering::HasBoxShadowNativeTheme(nsIFrame* aFrame,
+ bool& aMaybeHasBorderRadius) {
+ const nsStyleDisplay* styleDisplay = aFrame->StyleDisplay();
+ nsITheme::Transparency transparency;
+ if (aFrame->IsThemed(styleDisplay, &transparency)) {
+ aMaybeHasBorderRadius = false;
+ // For opaque (rectangular) theme widgets we can take the generic
+ // border-box path with border-radius disabled.
+ return transparency != nsITheme::eOpaque;
+ }
+
+ aMaybeHasBorderRadius = true;
+ return false;
+}
+
+gfx::sRGBColor nsCSSRendering::GetShadowColor(const StyleSimpleShadow& aShadow,
+ nsIFrame* aFrame,
+ float aOpacity) {
+ // Get the shadow color; if not specified, use the foreground color
+ nscolor shadowColor = aShadow.color.CalcColor(aFrame);
+ sRGBColor color = sRGBColor::FromABGR(shadowColor);
+ color.a *= aOpacity;
+ return color;
+}
+
+nsRect nsCSSRendering::GetShadowRect(const nsRect& aFrameArea,
+ bool aNativeTheme, nsIFrame* aForFrame) {
+ nsRect frameRect = aNativeTheme ? aForFrame->InkOverflowRectRelativeToSelf() +
+ aFrameArea.TopLeft()
+ : aFrameArea;
+ Sides skipSides = aForFrame->GetSkipSides();
+ frameRect = BoxDecorationRectForBorder(aForFrame, frameRect, skipSides);
+
+ // Explicitly do not need to account for the spread radius here
+ // Webrender does it for us or PaintBoxShadow will for non-WR
+ return frameRect;
+}
+
+bool nsCSSRendering::GetBorderRadii(const nsRect& aFrameRect,
+ const nsRect& aBorderRect, nsIFrame* aFrame,
+ RectCornerRadii& aOutRadii) {
+ const nscoord oneDevPixel = aFrame->PresContext()->DevPixelsToAppUnits(1);
+ nscoord twipsRadii[8];
+ NS_ASSERTION(
+ aBorderRect.Size() == aFrame->VisualBorderRectRelativeToSelf().Size(),
+ "unexpected size");
+ nsSize sz = aFrameRect.Size();
+ bool hasBorderRadius = aFrame->GetBorderRadii(sz, sz, Sides(), twipsRadii);
+ if (hasBorderRadius) {
+ ComputePixelRadii(twipsRadii, oneDevPixel, &aOutRadii);
+ }
+
+ return hasBorderRadius;
+}
+
+void nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
+ gfxContext& aRenderingContext,
+ nsIFrame* aForFrame,
+ const nsRect& aFrameArea,
+ const nsRect& aDirtyRect,
+ float aOpacity) {
+ DrawTarget& aDrawTarget = *aRenderingContext.GetDrawTarget();
+ auto shadows = aForFrame->StyleEffects()->mBoxShadow.AsSpan();
+ if (shadows.IsEmpty()) {
+ return;
+ }
+
+ bool hasBorderRadius;
+ // mutually exclusive with hasBorderRadius
+ bool nativeTheme = HasBoxShadowNativeTheme(aForFrame, hasBorderRadius);
+ const nsStyleDisplay* styleDisplay = aForFrame->StyleDisplay();
+
+ nsRect frameRect = GetShadowRect(aFrameArea, nativeTheme, aForFrame);
+
+ // Get any border radius, since box-shadow must also have rounded corners if
+ // the frame does.
+ RectCornerRadii borderRadii;
+ const nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
+ if (hasBorderRadius) {
+ nscoord twipsRadii[8];
+ NS_ASSERTION(
+ aFrameArea.Size() == aForFrame->VisualBorderRectRelativeToSelf().Size(),
+ "unexpected size");
+ nsSize sz = frameRect.Size();
+ hasBorderRadius = aForFrame->GetBorderRadii(sz, sz, Sides(), twipsRadii);
+ if (hasBorderRadius) {
+ ComputePixelRadii(twipsRadii, oneDevPixel, &borderRadii);
+ }
+ }
+
+ // We don't show anything that intersects with the frame we're blurring on. So
+ // tell the blurrer not to do unnecessary work there.
+ gfxRect skipGfxRect = ThebesRect(NSRectToRect(frameRect, oneDevPixel));
+ skipGfxRect.Round();
+ bool useSkipGfxRect = true;
+ if (nativeTheme) {
+ // Optimize non-leaf native-themed frames by skipping computing pixels
+ // in the padding-box. We assume the padding-box is going to be painted
+ // opaquely for non-leaf frames.
+ // XXX this may not be a safe assumption; we should make this go away
+ // by optimizing box-shadow drawing more for the cases where we don't have a
+ // skip-rect.
+ useSkipGfxRect = !aForFrame->IsLeaf();
+ nsRect paddingRect =
+ aForFrame->GetPaddingRectRelativeToSelf() + aFrameArea.TopLeft();
+ skipGfxRect = nsLayoutUtils::RectToGfxRect(paddingRect, oneDevPixel);
+ } else if (hasBorderRadius) {
+ skipGfxRect.Deflate(gfxMargin(
+ std::max(borderRadii[C_TL].height, borderRadii[C_TR].height), 0,
+ std::max(borderRadii[C_BL].height, borderRadii[C_BR].height), 0));
+ }
+
+ for (const StyleBoxShadow& shadow : Reversed(shadows)) {
+ if (shadow.inset) {
+ continue;
+ }
+
+ nsRect shadowRect = frameRect;
+ nsPoint shadowOffset(shadow.base.horizontal.ToAppUnits(),
+ shadow.base.vertical.ToAppUnits());
+ shadowRect.MoveBy(shadowOffset);
+ nscoord shadowSpread = shadow.spread.ToAppUnits();
+ if (!nativeTheme) {
+ shadowRect.Inflate(shadowSpread);
+ }
+
+ // shadowRect won't include the blur, so make an extra rect here that
+ // includes the blur for use in the even-odd rule below.
+ nsRect shadowRectPlusBlur = shadowRect;
+ nscoord blurRadius = shadow.base.blur.ToAppUnits();
+ shadowRectPlusBlur.Inflate(
+ nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, oneDevPixel));
+
+ Rect shadowGfxRectPlusBlur = NSRectToRect(shadowRectPlusBlur, oneDevPixel);
+ shadowGfxRectPlusBlur.RoundOut();
+ MaybeSnapToDevicePixels(shadowGfxRectPlusBlur, aDrawTarget, true);
+
+ sRGBColor gfxShadowColor = GetShadowColor(shadow.base, aForFrame, aOpacity);
+
+ if (nativeTheme) {
+ nsContextBoxBlur blurringArea;
+
+ // When getting the widget shape from the native theme, we're going
+ // to draw the widget into the shadow surface to create a mask.
+ // We need to ensure that there actually *is* a shadow surface
+ // and that we're not going to draw directly into aRenderingContext.
+ gfxContext* shadowContext = blurringArea.Init(
+ shadowRect, shadowSpread, blurRadius, oneDevPixel, &aRenderingContext,
+ aDirtyRect, useSkipGfxRect ? &skipGfxRect : nullptr,
+ nsContextBoxBlur::FORCE_MASK);
+ if (!shadowContext) continue;
+
+ MOZ_ASSERT(shadowContext == blurringArea.GetContext());
+
+ aRenderingContext.Save();
+ aRenderingContext.SetColor(gfxShadowColor);
+
+ // Draw the shape of the frame so it can be blurred. Recall how
+ // nsContextBoxBlur doesn't make any temporary surfaces if blur is 0 and
+ // it just returns the original surface? If we have no blur, we're
+ // painting this fill on the actual content surface (aRenderingContext ==
+ // shadowContext) which is why we set up the color and clip before doing
+ // this.
+
+ // We don't clip the border-box from the shadow, nor any other box.
+ // We assume that the native theme is going to paint over the shadow.
+
+ // Draw the widget shape
+ gfxContextMatrixAutoSaveRestore save(shadowContext);
+ gfxPoint devPixelOffset = nsLayoutUtils::PointToGfxPoint(
+ shadowOffset, aPresContext->AppUnitsPerDevPixel());
+ shadowContext->SetMatrixDouble(
+ shadowContext->CurrentMatrixDouble().PreTranslate(devPixelOffset));
+
+ nsRect nativeRect = aDirtyRect;
+ nativeRect.MoveBy(-shadowOffset);
+ nativeRect.IntersectRect(frameRect, nativeRect);
+ aPresContext->Theme()->DrawWidgetBackground(
+ shadowContext, aForFrame, styleDisplay->EffectiveAppearance(),
+ aFrameArea, nativeRect);
+
+ blurringArea.DoPaint();
+ aRenderingContext.Restore();
+ } else {
+ aRenderingContext.Save();
+
+ {
+ Rect innerClipRect = NSRectToRect(frameRect, oneDevPixel);
+ if (!MaybeSnapToDevicePixels(innerClipRect, aDrawTarget, true)) {
+ innerClipRect.Round();
+ }
+
+ // Clip out the interior of the frame's border edge so that the shadow
+ // is only painted outside that area.
+ RefPtr<PathBuilder> builder =
+ aDrawTarget.CreatePathBuilder(FillRule::FILL_EVEN_ODD);
+ AppendRectToPath(builder, shadowGfxRectPlusBlur);
+ if (hasBorderRadius) {
+ AppendRoundedRectToPath(builder, innerClipRect, borderRadii);
+ } else {
+ AppendRectToPath(builder, innerClipRect);
+ }
+ RefPtr<Path> path = builder->Finish();
+ aRenderingContext.Clip(path);
+ }
+
+ // Clip the shadow so that we only get the part that applies to aForFrame.
+ nsRect fragmentClip = shadowRectPlusBlur;
+ Sides skipSides = aForFrame->GetSkipSides();
+ if (!skipSides.IsEmpty()) {
+ if (skipSides.Left()) {
+ nscoord xmost = fragmentClip.XMost();
+ fragmentClip.x = aFrameArea.x;
+ fragmentClip.width = xmost - fragmentClip.x;
+ }
+ if (skipSides.Right()) {
+ nscoord xmost = fragmentClip.XMost();
+ nscoord overflow = xmost - aFrameArea.XMost();
+ if (overflow > 0) {
+ fragmentClip.width -= overflow;
+ }
+ }
+ if (skipSides.Top()) {
+ nscoord ymost = fragmentClip.YMost();
+ fragmentClip.y = aFrameArea.y;
+ fragmentClip.height = ymost - fragmentClip.y;
+ }
+ if (skipSides.Bottom()) {
+ nscoord ymost = fragmentClip.YMost();
+ nscoord overflow = ymost - aFrameArea.YMost();
+ if (overflow > 0) {
+ fragmentClip.height -= overflow;
+ }
+ }
+ }
+ fragmentClip = fragmentClip.Intersect(aDirtyRect);
+ aRenderingContext.Clip(NSRectToSnappedRect(
+ fragmentClip, aForFrame->PresContext()->AppUnitsPerDevPixel(),
+ aDrawTarget));
+
+ RectCornerRadii clipRectRadii;
+ if (hasBorderRadius) {
+ Float spreadDistance = Float(shadowSpread / oneDevPixel);
+
+ Float borderSizes[4];
+
+ borderSizes[eSideLeft] = spreadDistance;
+ borderSizes[eSideTop] = spreadDistance;
+ borderSizes[eSideRight] = spreadDistance;
+ borderSizes[eSideBottom] = spreadDistance;
+
+ nsCSSBorderRenderer::ComputeOuterRadii(borderRadii, borderSizes,
+ &clipRectRadii);
+ }
+ nsContextBoxBlur::BlurRectangle(
+ &aRenderingContext, shadowRect, oneDevPixel,
+ hasBorderRadius ? &clipRectRadii : nullptr, blurRadius,
+ gfxShadowColor, aDirtyRect, skipGfxRect);
+ aRenderingContext.Restore();
+ }
+ }
+}
+
+nsRect nsCSSRendering::GetBoxShadowInnerPaddingRect(nsIFrame* aFrame,
+ const nsRect& aFrameArea) {
+ Sides skipSides = aFrame->GetSkipSides();
+ nsRect frameRect = BoxDecorationRectForBorder(aFrame, aFrameArea, skipSides);
+
+ nsRect paddingRect = frameRect;
+ nsMargin border = aFrame->GetUsedBorder();
+ paddingRect.Deflate(border);
+ return paddingRect;
+}
+
+bool nsCSSRendering::ShouldPaintBoxShadowInner(nsIFrame* aFrame) {
+ const Span<const StyleBoxShadow> shadows =
+ aFrame->StyleEffects()->mBoxShadow.AsSpan();
+ if (shadows.IsEmpty()) {
+ return false;
+ }
+
+ if (aFrame->IsThemed() && aFrame->GetContent() &&
+ !nsContentUtils::IsChromeDoc(aFrame->GetContent()->GetComposedDoc())) {
+ // There's no way of getting hold of a shape corresponding to a
+ // "padding-box" for native-themed widgets, so just don't draw
+ // inner box-shadows for them. But we allow chrome to paint inner
+ // box shadows since chrome can be aware of the platform theme.
+ return false;
+ }
+
+ return true;
+}
+
+bool nsCSSRendering::GetShadowInnerRadii(nsIFrame* aFrame,
+ const nsRect& aFrameArea,
+ RectCornerRadii& aOutInnerRadii) {
+ // Get any border radius, since box-shadow must also have rounded corners
+ // if the frame does.
+ nscoord twipsRadii[8];
+ nsRect frameRect =
+ BoxDecorationRectForBorder(aFrame, aFrameArea, aFrame->GetSkipSides());
+ nsSize sz = frameRect.Size();
+ nsMargin border = aFrame->GetUsedBorder();
+ aFrame->GetBorderRadii(sz, sz, Sides(), twipsRadii);
+ const nscoord oneDevPixel = aFrame->PresContext()->DevPixelsToAppUnits(1);
+
+ RectCornerRadii borderRadii;
+
+ const bool hasBorderRadius =
+ GetBorderRadii(frameRect, aFrameArea, aFrame, borderRadii);
+
+ if (hasBorderRadius) {
+ ComputePixelRadii(twipsRadii, oneDevPixel, &borderRadii);
+
+ Float borderSizes[4] = {
+ Float(border.top) / oneDevPixel, Float(border.right) / oneDevPixel,
+ Float(border.bottom) / oneDevPixel, Float(border.left) / oneDevPixel};
+ nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
+ &aOutInnerRadii);
+ }
+
+ return hasBorderRadius;
+}
+
+void nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
+ gfxContext& aRenderingContext,
+ nsIFrame* aForFrame,
+ const nsRect& aFrameArea) {
+ if (!ShouldPaintBoxShadowInner(aForFrame)) {
+ return;
+ }
+
+ const Span<const StyleBoxShadow> shadows =
+ aForFrame->StyleEffects()->mBoxShadow.AsSpan();
+ NS_ASSERTION(
+ aForFrame->IsFieldSetFrame() || aFrameArea.Size() == aForFrame->GetSize(),
+ "unexpected size");
+
+ nsRect paddingRect = GetBoxShadowInnerPaddingRect(aForFrame, aFrameArea);
+
+ RectCornerRadii innerRadii;
+ bool hasBorderRadius = GetShadowInnerRadii(aForFrame, aFrameArea, innerRadii);
+
+ const nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
+
+ for (const StyleBoxShadow& shadow : Reversed(shadows)) {
+ if (!shadow.inset) {
+ continue;
+ }
+
+ // shadowPaintRect: the area to paint on the temp surface
+ // shadowClipRect: the area on the temporary surface within shadowPaintRect
+ // that we will NOT paint in
+ nscoord blurRadius = shadow.base.blur.ToAppUnits();
+ nsMargin blurMargin =
+ nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, oneDevPixel);
+ nsRect shadowPaintRect = paddingRect;
+ shadowPaintRect.Inflate(blurMargin);
+
+ // Round the spread radius to device pixels (by truncation).
+ // This mostly matches what we do for borders, except that we don't round
+ // up values between zero and one device pixels to one device pixel.
+ // This way of rounding is symmetric around zero, which makes sense for
+ // the spread radius.
+ int32_t spreadDistance = shadow.spread.ToAppUnits() / oneDevPixel;
+ nscoord spreadDistanceAppUnits =
+ aPresContext->DevPixelsToAppUnits(spreadDistance);
+
+ nsRect shadowClipRect = paddingRect;
+ shadowClipRect.MoveBy(shadow.base.horizontal.ToAppUnits(),
+ shadow.base.vertical.ToAppUnits());
+ shadowClipRect.Deflate(spreadDistanceAppUnits, spreadDistanceAppUnits);
+
+ Rect shadowClipGfxRect = NSRectToRect(shadowClipRect, oneDevPixel);
+ shadowClipGfxRect.Round();
+
+ RectCornerRadii clipRectRadii;
+ if (hasBorderRadius) {
+ // Calculate the radii the inner clipping rect will have
+ Float borderSizes[4] = {0, 0, 0, 0};
+
+ // See PaintBoxShadowOuter and bug 514670
+ if (innerRadii[C_TL].width > 0 || innerRadii[C_BL].width > 0) {
+ borderSizes[eSideLeft] = spreadDistance;
+ }
+
+ if (innerRadii[C_TL].height > 0 || innerRadii[C_TR].height > 0) {
+ borderSizes[eSideTop] = spreadDistance;
+ }
+
+ if (innerRadii[C_TR].width > 0 || innerRadii[C_BR].width > 0) {
+ borderSizes[eSideRight] = spreadDistance;
+ }
+
+ if (innerRadii[C_BL].height > 0 || innerRadii[C_BR].height > 0) {
+ borderSizes[eSideBottom] = spreadDistance;
+ }
+
+ nsCSSBorderRenderer::ComputeInnerRadii(innerRadii, borderSizes,
+ &clipRectRadii);
+ }
+
+ // Set the "skip rect" to the area within the frame that we don't paint in,
+ // including after blurring.
+ nsRect skipRect = shadowClipRect;
+ skipRect.Deflate(blurMargin);
+ gfxRect skipGfxRect = nsLayoutUtils::RectToGfxRect(skipRect, oneDevPixel);
+ if (hasBorderRadius) {
+ skipGfxRect.Deflate(gfxMargin(
+ std::max(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height), 0,
+ std::max(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height), 0));
+ }
+
+ // When there's a blur radius, gfxAlphaBoxBlur leaves the skiprect area
+ // unchanged. And by construction the gfxSkipRect is not touched by the
+ // rendered shadow (even after blurring), so those pixels must be completely
+ // transparent in the shadow, so drawing them changes nothing.
+ DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
+
+ // Clip the context to the area of the frame's padding rect, so no part of
+ // the shadow is painted outside. Also cut out anything beyond where the
+ // inset shadow will be.
+ Rect shadowGfxRect = NSRectToRect(paddingRect, oneDevPixel);
+ shadowGfxRect.Round();
+
+ sRGBColor shadowColor = GetShadowColor(shadow.base, aForFrame, 1.0);
+ aRenderingContext.Save();
+
+ // This clips the outside border radius.
+ // clipRectRadii is the border radius inside the inset shadow.
+ if (hasBorderRadius) {
+ RefPtr<Path> roundedRect =
+ MakePathForRoundedRect(*drawTarget, shadowGfxRect, innerRadii);
+ aRenderingContext.Clip(roundedRect);
+ } else {
+ aRenderingContext.Clip(shadowGfxRect);
+ }
+
+ nsContextBoxBlur insetBoxBlur;
+ gfxRect destRect =
+ nsLayoutUtils::RectToGfxRect(shadowPaintRect, oneDevPixel);
+ Point shadowOffset(shadow.base.horizontal.ToAppUnits() / oneDevPixel,
+ shadow.base.vertical.ToAppUnits() / oneDevPixel);
+
+ insetBoxBlur.InsetBoxBlur(
+ &aRenderingContext, ToRect(destRect), shadowClipGfxRect, shadowColor,
+ blurRadius, spreadDistanceAppUnits, oneDevPixel, hasBorderRadius,
+ clipRectRadii, ToRect(skipGfxRect), shadowOffset);
+ aRenderingContext.Restore();
+ }
+}
+
+/* static */
+nsCSSRendering::PaintBGParams nsCSSRendering::PaintBGParams::ForAllLayers(
+ nsPresContext& aPresCtx, const nsRect& aDirtyRect,
+ const nsRect& aBorderArea, nsIFrame* aFrame, uint32_t aPaintFlags,
+ float aOpacity) {
+ MOZ_ASSERT(aFrame);
+
+ PaintBGParams result(aPresCtx, aDirtyRect, aBorderArea, aFrame, aPaintFlags,
+ -1, CompositionOp::OP_OVER, aOpacity);
+
+ return result;
+}
+
+/* static */
+nsCSSRendering::PaintBGParams nsCSSRendering::PaintBGParams::ForSingleLayer(
+ nsPresContext& aPresCtx, const nsRect& aDirtyRect,
+ const nsRect& aBorderArea, nsIFrame* aFrame, uint32_t aPaintFlags,
+ int32_t aLayer, CompositionOp aCompositionOp, float aOpacity) {
+ MOZ_ASSERT(aFrame && (aLayer != -1));
+
+ PaintBGParams result(aPresCtx, aDirtyRect, aBorderArea, aFrame, aPaintFlags,
+ aLayer, aCompositionOp, aOpacity);
+
+ return result;
+}
+
+ImgDrawResult nsCSSRendering::PaintStyleImageLayer(const PaintBGParams& aParams,
+ gfxContext& aRenderingCtx) {
+ AUTO_PROFILER_LABEL("nsCSSRendering::PaintStyleImageLayer", GRAPHICS);
+
+ MOZ_ASSERT(aParams.frame,
+ "Frame is expected to be provided to PaintStyleImageLayer");
+
+ ComputedStyle* sc;
+ if (!FindBackground(aParams.frame, &sc)) {
+ // We don't want to bail out if moz-appearance is set on a root
+ // node. If it has a parent content node, bail because it's not
+ // a root, otherwise keep going in order to let the theme stuff
+ // draw the background. The canvas really should be drawing the
+ // bg, but there's no way to hook that up via css.
+ if (!aParams.frame->StyleDisplay()->HasAppearance()) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ nsIContent* content = aParams.frame->GetContent();
+ if (!content || content->GetParent()) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ sc = aParams.frame->Style();
+ }
+
+ return PaintStyleImageLayerWithSC(aParams, aRenderingCtx, sc,
+ *aParams.frame->StyleBorder());
+}
+
+bool nsCSSRendering::CanBuildWebRenderDisplayItemsForStyleImageLayer(
+ LayerManager* aManager, nsPresContext& aPresCtx, nsIFrame* aFrame,
+ const nsStyleBackground* aBackgroundStyle, int32_t aLayer,
+ uint32_t aPaintFlags) {
+ if (!aBackgroundStyle) {
+ return false;
+ }
+
+ MOZ_ASSERT(aFrame && aLayer >= 0 &&
+ (uint32_t)aLayer < aBackgroundStyle->mImage.mLayers.Length());
+
+ // We cannot draw native themed backgrounds
+ StyleAppearance appearance = aFrame->StyleDisplay()->EffectiveAppearance();
+ if (appearance != StyleAppearance::None) {
+ nsITheme* theme = aPresCtx.Theme();
+ if (theme->ThemeSupportsWidget(&aPresCtx, aFrame, appearance)) {
+ return false;
+ }
+ }
+
+ // We only support painting gradients and image for a single style image
+ // layer, and we don't support crop-rects.
+ const auto& styleImage =
+ aBackgroundStyle->mImage.mLayers[aLayer].mImage.FinalImage();
+ if (styleImage.IsImageRequestType()) {
+ if (styleImage.IsRect()) {
+ return false;
+ }
+
+ imgRequestProxy* requestProxy = styleImage.GetImageRequest();
+ if (!requestProxy) {
+ return false;
+ }
+
+ uint32_t imageFlags = imgIContainer::FLAG_NONE;
+ if (aPaintFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES) {
+ imageFlags |= imgIContainer::FLAG_SYNC_DECODE;
+ }
+
+ nsCOMPtr<imgIContainer> srcImage;
+ requestProxy->GetImage(getter_AddRefs(srcImage));
+ if (!srcImage ||
+ !srcImage->IsImageContainerAvailable(aManager, imageFlags)) {
+ return false;
+ }
+
+ return true;
+ }
+
+ if (styleImage.IsGradient()) {
+ return true;
+ }
+
+ return false;
+}
+
+ImgDrawResult nsCSSRendering::BuildWebRenderDisplayItemsForStyleImageLayer(
+ const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
+ mozilla::wr::IpcResourceUpdateQueue& aResources,
+ const mozilla::layers::StackingContextHelper& aSc,
+ mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem) {
+ MOZ_ASSERT(aParams.frame,
+ "Frame is expected to be provided to "
+ "BuildWebRenderDisplayItemsForStyleImageLayer");
+
+ ComputedStyle* sc;
+ if (!FindBackground(aParams.frame, &sc)) {
+ // We don't want to bail out if moz-appearance is set on a root
+ // node. If it has a parent content node, bail because it's not
+ // a root, otherwise keep going in order to let the theme stuff
+ // draw the background. The canvas really should be drawing the
+ // bg, but there's no way to hook that up via css.
+ if (!aParams.frame->StyleDisplay()->HasAppearance()) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ nsIContent* content = aParams.frame->GetContent();
+ if (!content || content->GetParent()) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ sc = aParams.frame->Style();
+ }
+ return BuildWebRenderDisplayItemsForStyleImageLayerWithSC(
+ aParams, aBuilder, aResources, aSc, aManager, aItem, sc,
+ *aParams.frame->StyleBorder());
+}
+
+static bool IsOpaqueBorderEdge(const nsStyleBorder& aBorder,
+ mozilla::Side aSide) {
+ if (aBorder.GetComputedBorder().Side(aSide) == 0) return true;
+ switch (aBorder.GetBorderStyle(aSide)) {
+ case StyleBorderStyle::Solid:
+ case StyleBorderStyle::Groove:
+ case StyleBorderStyle::Ridge:
+ case StyleBorderStyle::Inset:
+ case StyleBorderStyle::Outset:
+ break;
+ default:
+ return false;
+ }
+
+ // If we're using a border image, assume it's not fully opaque,
+ // because we may not even have the image loaded at this point, and
+ // even if we did, checking whether the relevant tile is fully
+ // opaque would be too much work.
+ if (!aBorder.mBorderImageSource.IsNone()) {
+ return false;
+ }
+
+ StyleColor color = aBorder.BorderColorFor(aSide);
+ // We don't know the foreground color here, so if it's being used
+ // we must assume it might be transparent.
+ return !color.MaybeTransparent();
+}
+
+/**
+ * Returns true if all border edges are either missing or opaque.
+ */
+static bool IsOpaqueBorder(const nsStyleBorder& aBorder) {
+ for (const auto i : mozilla::AllPhysicalSides()) {
+ if (!IsOpaqueBorderEdge(aBorder, i)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+static inline void SetupDirtyRects(const nsRect& aBGClipArea,
+ const nsRect& aCallerDirtyRect,
+ nscoord aAppUnitsPerPixel,
+ /* OUT: */
+ nsRect* aDirtyRect, gfxRect* aDirtyRectGfx) {
+ aDirtyRect->IntersectRect(aBGClipArea, aCallerDirtyRect);
+
+ // Compute the Thebes equivalent of the dirtyRect.
+ *aDirtyRectGfx = nsLayoutUtils::RectToGfxRect(*aDirtyRect, aAppUnitsPerPixel);
+ NS_WARNING_ASSERTION(aDirtyRect->IsEmpty() || !aDirtyRectGfx->IsEmpty(),
+ "converted dirty rect should not be empty");
+ MOZ_ASSERT(!aDirtyRect->IsEmpty() || aDirtyRectGfx->IsEmpty(),
+ "second should be empty if first is");
+}
+
+static bool IsSVGStyleGeometryBox(StyleGeometryBox aBox) {
+ return (aBox == StyleGeometryBox::FillBox ||
+ aBox == StyleGeometryBox::StrokeBox ||
+ aBox == StyleGeometryBox::ViewBox);
+}
+
+static bool IsHTMLStyleGeometryBox(StyleGeometryBox aBox) {
+ return (aBox == StyleGeometryBox::ContentBox ||
+ aBox == StyleGeometryBox::PaddingBox ||
+ aBox == StyleGeometryBox::BorderBox ||
+ aBox == StyleGeometryBox::MarginBox);
+}
+
+static StyleGeometryBox ComputeBoxValue(nsIFrame* aForFrame,
+ StyleGeometryBox aBox) {
+ if (!aForFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
+ // For elements with associated CSS layout box, the values fill-box,
+ // stroke-box and view-box compute to the initial value of mask-clip.
+ if (IsSVGStyleGeometryBox(aBox)) {
+ return StyleGeometryBox::BorderBox;
+ }
+ } else {
+ // For SVG elements without associated CSS layout box, the values
+ // content-box, padding-box, border-box and margin-box compute to fill-box.
+ if (IsHTMLStyleGeometryBox(aBox)) {
+ return StyleGeometryBox::FillBox;
+ }
+ }
+
+ return aBox;
+}
+
+bool nsCSSRendering::ImageLayerClipState::IsValid() const {
+ // mDirtyRectInDevPx comes from mDirtyRectInAppUnits. mDirtyRectInAppUnits
+ // can not be empty if mDirtyRectInDevPx is not.
+ if (!mDirtyRectInDevPx.IsEmpty() && mDirtyRectInAppUnits.IsEmpty()) {
+ return false;
+ }
+
+ if (mHasRoundedCorners == mClippedRadii.IsEmpty()) {
+ return false;
+ }
+
+ return true;
+}
+
+/* static */
+void nsCSSRendering::GetImageLayerClip(
+ const nsStyleImageLayers::Layer& aLayer, nsIFrame* aForFrame,
+ const nsStyleBorder& aBorder, const nsRect& aBorderArea,
+ const nsRect& aCallerDirtyRect, bool aWillPaintBorder,
+ nscoord aAppUnitsPerPixel,
+ /* out */ ImageLayerClipState* aClipState) {
+ StyleGeometryBox layerClip = ComputeBoxValue(aForFrame, aLayer.mClip);
+ if (IsSVGStyleGeometryBox(layerClip)) {
+ MOZ_ASSERT(aForFrame->IsFrameOfType(nsIFrame::eSVG) &&
+ !aForFrame->IsSVGOuterSVGFrame());
+
+ // The coordinate space of clipArea is svg user space.
+ nsRect clipArea = nsLayoutUtils::ComputeGeometryBox(aForFrame, layerClip);
+
+ nsRect strokeBox = (layerClip == StyleGeometryBox::StrokeBox)
+ ? clipArea
+ : nsLayoutUtils::ComputeGeometryBox(
+ aForFrame, StyleGeometryBox::StrokeBox);
+ nsRect clipAreaRelativeToStrokeBox = clipArea - strokeBox.TopLeft();
+
+ // aBorderArea is the stroke-box area in a coordinate space defined by
+ // the caller. This coordinate space can be svg user space of aForFrame,
+ // the space of aForFrame's reference-frame, or anything else.
+ //
+ // Which coordinate space chosen for aBorderArea is not matter. What
+ // matter is to ensure returning aClipState->mBGClipArea in the consistent
+ // coordiante space with aBorderArea. So we evaluate the position of clip
+ // area base on the position of aBorderArea here.
+ aClipState->mBGClipArea =
+ clipAreaRelativeToStrokeBox + aBorderArea.TopLeft();
+
+ SetupDirtyRects(aClipState->mBGClipArea, aCallerDirtyRect,
+ aAppUnitsPerPixel, &aClipState->mDirtyRectInAppUnits,
+ &aClipState->mDirtyRectInDevPx);
+ MOZ_ASSERT(aClipState->IsValid());
+ return;
+ }
+
+ if (layerClip == StyleGeometryBox::NoClip) {
+ aClipState->mBGClipArea = aCallerDirtyRect;
+
+ SetupDirtyRects(aClipState->mBGClipArea, aCallerDirtyRect,
+ aAppUnitsPerPixel, &aClipState->mDirtyRectInAppUnits,
+ &aClipState->mDirtyRectInDevPx);
+ MOZ_ASSERT(aClipState->IsValid());
+ return;
+ }
+
+ MOZ_ASSERT(!aForFrame->IsFrameOfType(nsIFrame::eSVG) ||
+ aForFrame->IsSVGOuterSVGFrame());
+
+ // Compute the outermost boundary of the area that might be painted.
+ // Same coordinate space as aBorderArea.
+ Sides skipSides = aForFrame->GetSkipSides();
+ nsRect clipBorderArea =
+ BoxDecorationRectForBorder(aForFrame, aBorderArea, skipSides, &aBorder);
+
+ bool haveRoundedCorners = false;
+ LayoutFrameType fType = aForFrame->Type();
+ if (fType != LayoutFrameType::TableColGroup &&
+ fType != LayoutFrameType::TableCol &&
+ fType != LayoutFrameType::TableRow &&
+ fType != LayoutFrameType::TableRowGroup) {
+ haveRoundedCorners = GetRadii(aForFrame, aBorder, aBorderArea,
+ clipBorderArea, aClipState->mRadii);
+ }
+ bool isSolidBorder = aWillPaintBorder && IsOpaqueBorder(aBorder);
+ if (isSolidBorder && layerClip == StyleGeometryBox::BorderBox) {
+ // If we have rounded corners, we need to inflate the background
+ // drawing area a bit to avoid seams between the border and
+ // background.
+ layerClip = haveRoundedCorners ? StyleGeometryBox::MozAlmostPadding
+ : StyleGeometryBox::PaddingBox;
+ }
+
+ aClipState->mBGClipArea = clipBorderArea;
+
+ if (aForFrame->IsScrollFrame() &&
+ StyleImageLayerAttachment::Local == aLayer.mAttachment) {
+ // As of this writing, this is still in discussion in the CSS Working Group
+ // http://lists.w3.org/Archives/Public/www-style/2013Jul/0250.html
+
+ // The rectangle for 'background-clip' scrolls with the content,
+ // but the background is also clipped at a non-scrolling 'padding-box'
+ // like the content. (See below.)
+ // Therefore, only 'content-box' makes a difference here.
+ if (layerClip == StyleGeometryBox::ContentBox) {
+ nsIScrollableFrame* scrollableFrame = do_QueryFrame(aForFrame);
+ // Clip at a rectangle attached to the scrolled content.
+ aClipState->mHasAdditionalBGClipArea = true;
+ aClipState->mAdditionalBGClipArea =
+ nsRect(aClipState->mBGClipArea.TopLeft() +
+ scrollableFrame->GetScrolledFrame()->GetPosition()
+ // For the dir=rtl case:
+ + scrollableFrame->GetScrollRange().TopLeft(),
+ scrollableFrame->GetScrolledRect().Size());
+ nsMargin padding = aForFrame->GetUsedPadding();
+ // padding-bottom is ignored on scrollable frames:
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=748518
+ padding.bottom = 0;
+ padding.ApplySkipSides(skipSides);
+ aClipState->mAdditionalBGClipArea.Deflate(padding);
+ }
+
+ // Also clip at a non-scrolling, rounded-corner 'padding-box',
+ // same as the scrolled content because of the 'overflow' property.
+ layerClip = StyleGeometryBox::PaddingBox;
+ }
+
+ // See the comment of StyleGeometryBox::Margin.
+ // Hitting this assertion means we decide to turn on margin-box support for
+ // positioned mask from CSS parser and style system. In this case, you
+ // should *inflate* mBGClipArea by the margin returning from
+ // aForFrame->GetUsedMargin() in the code chunk bellow.
+ MOZ_ASSERT(layerClip != StyleGeometryBox::MarginBox,
+ "StyleGeometryBox::MarginBox rendering is not supported yet.\n");
+
+ if (layerClip != StyleGeometryBox::BorderBox &&
+ layerClip != StyleGeometryBox::Text) {
+ nsMargin border = aForFrame->GetUsedBorder();
+ if (layerClip == StyleGeometryBox::MozAlmostPadding) {
+ // Reduce |border| by 1px (device pixels) on all sides, if
+ // possible, so that we don't get antialiasing seams between the
+ // {background|mask} and border.
+ border.top = std::max(0, border.top - aAppUnitsPerPixel);
+ border.right = std::max(0, border.right - aAppUnitsPerPixel);
+ border.bottom = std::max(0, border.bottom - aAppUnitsPerPixel);
+ border.left = std::max(0, border.left - aAppUnitsPerPixel);
+ } else if (layerClip != StyleGeometryBox::PaddingBox) {
+ NS_ASSERTION(layerClip == StyleGeometryBox::ContentBox,
+ "unexpected background-clip");
+ border += aForFrame->GetUsedPadding();
+ }
+ border.ApplySkipSides(skipSides);
+ aClipState->mBGClipArea.Deflate(border);
+
+ if (haveRoundedCorners) {
+ nsIFrame::InsetBorderRadii(aClipState->mRadii, border);
+ }
+ }
+
+ if (haveRoundedCorners) {
+ auto d2a = aForFrame->PresContext()->AppUnitsPerDevPixel();
+ nsCSSRendering::ComputePixelRadii(aClipState->mRadii, d2a,
+ &aClipState->mClippedRadii);
+ aClipState->mHasRoundedCorners = !aClipState->mClippedRadii.IsEmpty();
+ }
+
+ if (!haveRoundedCorners && aClipState->mHasAdditionalBGClipArea) {
+ // Do the intersection here to account for the fast path(?) below.
+ aClipState->mBGClipArea =
+ aClipState->mBGClipArea.Intersect(aClipState->mAdditionalBGClipArea);
+ aClipState->mHasAdditionalBGClipArea = false;
+ }
+
+ SetupDirtyRects(aClipState->mBGClipArea, aCallerDirtyRect, aAppUnitsPerPixel,
+ &aClipState->mDirtyRectInAppUnits,
+ &aClipState->mDirtyRectInDevPx);
+
+ MOZ_ASSERT(aClipState->IsValid());
+}
+
+static void SetupImageLayerClip(nsCSSRendering::ImageLayerClipState& aClipState,
+ gfxContext* aCtx, nscoord aAppUnitsPerPixel,
+ gfxContextAutoSaveRestore* aAutoSR) {
+ if (aClipState.mDirtyRectInDevPx.IsEmpty()) {
+ // Our caller won't draw anything under this condition, so no need
+ // to set more up.
+ return;
+ }
+
+ if (aClipState.mCustomClip) {
+ // We don't support custom clips and rounded corners, arguably a bug, but
+ // table painting seems to depend on it.
+ return;
+ }
+
+ // If we have rounded corners, clip all subsequent drawing to the
+ // rounded rectangle defined by bgArea and bgRadii (we don't know
+ // whether the rounded corners intrude on the dirtyRect or not).
+ // Do not do this if we have a caller-provided clip rect --
+ // as above with bgArea, arguably a bug, but table painting seems
+ // to depend on it.
+
+ if (aClipState.mHasAdditionalBGClipArea) {
+ gfxRect bgAreaGfx = nsLayoutUtils::RectToGfxRect(
+ aClipState.mAdditionalBGClipArea, aAppUnitsPerPixel);
+ bgAreaGfx.Round();
+ gfxUtils::ConditionRect(bgAreaGfx);
+
+ aAutoSR->EnsureSaved(aCtx);
+ aCtx->SnappedClip(bgAreaGfx);
+ }
+
+ if (aClipState.mHasRoundedCorners) {
+ Rect bgAreaGfx = NSRectToRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
+ bgAreaGfx.Round();
+
+ if (bgAreaGfx.IsEmpty()) {
+ // I think it's become possible to hit this since
+ // https://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
+ NS_WARNING("converted background area should not be empty");
+ // Make our caller not do anything.
+ aClipState.mDirtyRectInDevPx.SizeTo(gfxSize(0.0, 0.0));
+ return;
+ }
+
+ aAutoSR->EnsureSaved(aCtx);
+
+ RefPtr<Path> roundedRect = MakePathForRoundedRect(
+ *aCtx->GetDrawTarget(), bgAreaGfx, aClipState.mClippedRadii);
+ aCtx->Clip(roundedRect);
+ }
+}
+
+static void DrawBackgroundColor(nsCSSRendering::ImageLayerClipState& aClipState,
+ gfxContext* aCtx, nscoord aAppUnitsPerPixel) {
+ if (aClipState.mDirtyRectInDevPx.IsEmpty()) {
+ // Our caller won't draw anything under this condition, so no need
+ // to set more up.
+ return;
+ }
+
+ DrawTarget* drawTarget = aCtx->GetDrawTarget();
+
+ // We don't support custom clips and rounded corners, arguably a bug, but
+ // table painting seems to depend on it.
+ if (!aClipState.mHasRoundedCorners || aClipState.mCustomClip) {
+ aCtx->NewPath();
+ aCtx->SnappedRectangle(aClipState.mDirtyRectInDevPx);
+ aCtx->Fill();
+ return;
+ }
+
+ Rect bgAreaGfx = NSRectToRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
+ bgAreaGfx.Round();
+
+ if (bgAreaGfx.IsEmpty()) {
+ // I think it's become possible to hit this since
+ // https://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
+ NS_WARNING("converted background area should not be empty");
+ // Make our caller not do anything.
+ aClipState.mDirtyRectInDevPx.SizeTo(gfxSize(0.0, 0.0));
+ return;
+ }
+
+ aCtx->Save();
+ gfxRect dirty = ThebesRect(bgAreaGfx).Intersect(aClipState.mDirtyRectInDevPx);
+
+ aCtx->SnappedClip(dirty);
+
+ if (aClipState.mHasAdditionalBGClipArea) {
+ gfxRect bgAdditionalAreaGfx = nsLayoutUtils::RectToGfxRect(
+ aClipState.mAdditionalBGClipArea, aAppUnitsPerPixel);
+ bgAdditionalAreaGfx.Round();
+ gfxUtils::ConditionRect(bgAdditionalAreaGfx);
+ aCtx->SnappedClip(bgAdditionalAreaGfx);
+ }
+
+ RefPtr<Path> roundedRect =
+ MakePathForRoundedRect(*drawTarget, bgAreaGfx, aClipState.mClippedRadii);
+ aCtx->SetPath(roundedRect);
+ aCtx->Fill();
+ aCtx->Restore();
+}
+
+enum class ScrollbarColorKind {
+ Thumb,
+ Track,
+};
+
+static Maybe<nscolor> CalcScrollbarColor(nsIFrame* aFrame,
+ ScrollbarColorKind aKind) {
+ ComputedStyle* scrollbarStyle = nsLayoutUtils::StyleForScrollbar(aFrame);
+ const auto& colors = scrollbarStyle->StyleUI()->mScrollbarColor;
+ if (colors.IsAuto()) {
+ return Nothing();
+ }
+ const auto& color = aKind == ScrollbarColorKind::Thumb
+ ? colors.AsColors().thumb
+ : colors.AsColors().track;
+ return Some(color.CalcColor(*scrollbarStyle));
+}
+
+static nscolor GetBackgroundColor(nsIFrame* aFrame, ComputedStyle* aStyle) {
+ switch (aStyle->StyleDisplay()->EffectiveAppearance()) {
+ case StyleAppearance::ScrollbarthumbVertical:
+ case StyleAppearance::ScrollbarthumbHorizontal: {
+ if (Maybe<nscolor> overrideColor =
+ CalcScrollbarColor(aFrame, ScrollbarColorKind::Thumb)) {
+ return *overrideColor;
+ }
+ break;
+ }
+ case StyleAppearance::ScrollbarVertical:
+ case StyleAppearance::ScrollbarHorizontal:
+ case StyleAppearance::Scrollcorner: {
+ if (Maybe<nscolor> overrideColor =
+ CalcScrollbarColor(aFrame, ScrollbarColorKind::Track)) {
+ return *overrideColor;
+ }
+ break;
+ }
+ default:
+ break;
+ }
+ return aStyle->GetVisitedDependentColor(&nsStyleBackground::mBackgroundColor);
+}
+
+nscolor nsCSSRendering::DetermineBackgroundColor(nsPresContext* aPresContext,
+ ComputedStyle* aStyle,
+ nsIFrame* aFrame,
+ bool& aDrawBackgroundImage,
+ bool& aDrawBackgroundColor) {
+ auto shouldPaint = aFrame->ComputeShouldPaintBackground();
+ aDrawBackgroundImage = shouldPaint.mImage;
+ aDrawBackgroundColor = shouldPaint.mColor;
+
+ const nsStyleBackground* bg = aStyle->StyleBackground();
+ nscolor bgColor;
+ if (aDrawBackgroundColor) {
+ bgColor = GetBackgroundColor(aFrame, aStyle);
+ if (NS_GET_A(bgColor) == 0) {
+ aDrawBackgroundColor = false;
+ }
+ } else {
+ // If GetBackgroundColorDraw() is false, we are still expected to
+ // draw color in the background of any frame that's not completely
+ // transparent, but we are expected to use white instead of whatever
+ // color was specified.
+ bgColor = NS_RGB(255, 255, 255);
+ if (aDrawBackgroundImage || !bg->IsTransparent(aStyle)) {
+ aDrawBackgroundColor = true;
+ } else {
+ bgColor = NS_RGBA(0, 0, 0, 0);
+ }
+ }
+
+ // We can skip painting the background color if a background image is opaque.
+ nsStyleImageLayers::Repeat repeat = bg->BottomLayer().mRepeat;
+ bool xFullRepeat = repeat.mXRepeat == StyleImageLayerRepeat::Repeat ||
+ repeat.mXRepeat == StyleImageLayerRepeat::Round;
+ bool yFullRepeat = repeat.mYRepeat == StyleImageLayerRepeat::Repeat ||
+ repeat.mYRepeat == StyleImageLayerRepeat::Round;
+ if (aDrawBackgroundColor && xFullRepeat && yFullRepeat &&
+ bg->BottomLayer().mImage.IsOpaque() &&
+ bg->BottomLayer().mBlendMode == StyleBlend::Normal) {
+ aDrawBackgroundColor = false;
+ }
+
+ return bgColor;
+}
+
+static CompositionOp DetermineCompositionOp(
+ const nsCSSRendering::PaintBGParams& aParams,
+ const nsStyleImageLayers& aLayers, uint32_t aLayerIndex) {
+ if (aParams.layer >= 0) {
+ // When drawing a single layer, use the specified composition op.
+ return aParams.compositionOp;
+ }
+
+ const nsStyleImageLayers::Layer& layer = aLayers.mLayers[aLayerIndex];
+ // When drawing all layers, get the compositon op from each image layer.
+ if (aParams.paintFlags & nsCSSRendering::PAINTBG_MASK_IMAGE) {
+ // Always using OP_OVER mode while drawing the bottom mask layer.
+ if (aLayerIndex == (aLayers.mImageCount - 1)) {
+ return CompositionOp::OP_OVER;
+ }
+
+ return nsCSSRendering::GetGFXCompositeMode(layer.mComposite);
+ }
+
+ return nsCSSRendering::GetGFXBlendMode(layer.mBlendMode);
+}
+
+ImgDrawResult nsCSSRendering::PaintStyleImageLayerWithSC(
+ const PaintBGParams& aParams, gfxContext& aRenderingCtx,
+ ComputedStyle* aBackgroundSC, const nsStyleBorder& aBorder) {
+ MOZ_ASSERT(aParams.frame,
+ "Frame is expected to be provided to PaintStyleImageLayerWithSC");
+
+ // If we're drawing all layers, aCompositonOp is ignored, so make sure that
+ // it was left at its default value.
+ MOZ_ASSERT(aParams.layer != -1 ||
+ aParams.compositionOp == CompositionOp::OP_OVER);
+
+ // Check to see if we have an appearance defined. If so, we let the theme
+ // renderer draw the background and bail out.
+ // XXXzw this ignores aParams.bgClipRect.
+ StyleAppearance appearance =
+ aParams.frame->StyleDisplay()->EffectiveAppearance();
+ if (appearance != StyleAppearance::None) {
+ nsITheme* theme = aParams.presCtx.Theme();
+ if (theme->ThemeSupportsWidget(&aParams.presCtx, aParams.frame,
+ appearance)) {
+ nsRect drawing(aParams.borderArea);
+ theme->GetWidgetOverflow(aParams.presCtx.DeviceContext(), aParams.frame,
+ appearance, &drawing);
+ drawing.IntersectRect(drawing, aParams.dirtyRect);
+ theme->DrawWidgetBackground(&aRenderingCtx, aParams.frame, appearance,
+ aParams.borderArea, drawing);
+ return ImgDrawResult::SUCCESS;
+ }
+ }
+
+ // For canvas frames (in the CSS sense) we draw the background color using
+ // a solid color item that gets added in nsLayoutUtils::PaintFrame,
+ // or nsSubDocumentFrame::BuildDisplayList (bug 488242). (The solid
+ // color may be moved into nsDisplayCanvasBackground by
+ // PresShell::AddCanvasBackgroundColorItem(), and painted by
+ // nsDisplayCanvasBackground directly.) Either way we don't need to
+ // paint the background color here.
+ bool isCanvasFrame = IsCanvasFrame(aParams.frame);
+ const bool paintMask = aParams.paintFlags & PAINTBG_MASK_IMAGE;
+
+ // Determine whether we are drawing background images and/or
+ // background colors.
+ bool drawBackgroundImage = true;
+ bool drawBackgroundColor = !paintMask;
+ nscolor bgColor = NS_RGBA(0, 0, 0, 0);
+ if (!paintMask) {
+ bgColor =
+ DetermineBackgroundColor(&aParams.presCtx, aBackgroundSC, aParams.frame,
+ drawBackgroundImage, drawBackgroundColor);
+ }
+
+ // Masks shouldn't be suppressed for print.
+ MOZ_ASSERT_IF(paintMask, drawBackgroundImage);
+
+ const nsStyleImageLayers& layers =
+ paintMask ? aBackgroundSC->StyleSVGReset()->mMask
+ : aBackgroundSC->StyleBackground()->mImage;
+ // If we're drawing a specific layer, we don't want to draw the
+ // background color.
+ if (drawBackgroundColor && aParams.layer >= 0) {
+ drawBackgroundColor = false;
+ }
+
+ // At this point, drawBackgroundImage and drawBackgroundColor are
+ // true if and only if we are actually supposed to paint an image or
+ // color into aDirtyRect, respectively.
+ if (!drawBackgroundImage && !drawBackgroundColor) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ // The 'bgClipArea' (used only by the image tiling logic, far below)
+ // is the caller-provided aParams.bgClipRect if any, or else the area
+ // determined by the value of 'background-clip' in
+ // SetupCurrentBackgroundClip. (Arguably it should be the
+ // intersection, but that breaks the table painter -- in particular,
+ // taking the intersection breaks reftests/bugs/403249-1[ab].)
+ nscoord appUnitsPerPixel = aParams.presCtx.AppUnitsPerDevPixel();
+ ImageLayerClipState clipState;
+ if (aParams.bgClipRect) {
+ clipState.mBGClipArea = *aParams.bgClipRect;
+ clipState.mCustomClip = true;
+ clipState.mHasRoundedCorners = false;
+ SetupDirtyRects(clipState.mBGClipArea, aParams.dirtyRect, appUnitsPerPixel,
+ &clipState.mDirtyRectInAppUnits,
+ &clipState.mDirtyRectInDevPx);
+ } else {
+ GetImageLayerClip(layers.BottomLayer(), aParams.frame, aBorder,
+ aParams.borderArea, aParams.dirtyRect,
+ (aParams.paintFlags & PAINTBG_WILL_PAINT_BORDER),
+ appUnitsPerPixel, &clipState);
+ }
+
+ // If we might be using a background color, go ahead and set it now.
+ if (drawBackgroundColor && !isCanvasFrame) {
+ aRenderingCtx.SetColor(sRGBColor::FromABGR(bgColor));
+ }
+
+ // If there is no background image, draw a color. (If there is
+ // neither a background image nor a color, we wouldn't have gotten
+ // this far.)
+ if (!drawBackgroundImage) {
+ if (!isCanvasFrame) {
+ DrawBackgroundColor(clipState, &aRenderingCtx, appUnitsPerPixel);
+ }
+ return ImgDrawResult::SUCCESS;
+ }
+
+ if (layers.mImageCount < 1) {
+ // Return if there are no background layers, all work from this point
+ // onwards happens iteratively on these.
+ return ImgDrawResult::SUCCESS;
+ }
+
+ MOZ_ASSERT((aParams.layer < 0) ||
+ (layers.mImageCount > uint32_t(aParams.layer)));
+
+ // The background color is rendered over the entire dirty area,
+ // even if the image isn't.
+ if (drawBackgroundColor && !isCanvasFrame) {
+ DrawBackgroundColor(clipState, &aRenderingCtx, appUnitsPerPixel);
+ }
+
+ // Compute the outermost boundary of the area that might be painted.
+ // Same coordinate space as aParams.borderArea & aParams.bgClipRect.
+ Sides skipSides = aParams.frame->GetSkipSides();
+ nsRect paintBorderArea = BoxDecorationRectForBackground(
+ aParams.frame, aParams.borderArea, skipSides, &aBorder);
+ nsRect clipBorderArea = BoxDecorationRectForBorder(
+ aParams.frame, aParams.borderArea, skipSides, &aBorder);
+
+ ImgDrawResult result = ImgDrawResult::SUCCESS;
+ StyleGeometryBox currentBackgroundClip = StyleGeometryBox::BorderBox;
+ const bool drawAllLayers = (aParams.layer < 0);
+ uint32_t count = drawAllLayers
+ ? layers.mImageCount // iterate all image layers.
+ : layers.mImageCount -
+ aParams.layer; // iterate from the bottom layer to
+ // the 'aParams.layer-th' layer.
+ NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT_WITH_RANGE(
+ i, layers, layers.mImageCount - 1, count) {
+ // NOTE: no Save() yet, we do that later by calling autoSR.EnsureSaved(ctx)
+ // in the cases we need it.
+ gfxContextAutoSaveRestore autoSR;
+ const nsStyleImageLayers::Layer& layer = layers.mLayers[i];
+
+ if (!aParams.bgClipRect) {
+ bool isBottomLayer = (i == layers.mImageCount - 1);
+ if (currentBackgroundClip != layer.mClip || isBottomLayer) {
+ currentBackgroundClip = layer.mClip;
+ ImageLayerClipState currentLayerClipState;
+ if (isBottomLayer) {
+ currentLayerClipState = clipState;
+ } else {
+ // For the bottom layer, we already called GetImageLayerClip above
+ // and it stored its results in clipState.
+ GetImageLayerClip(layer, aParams.frame, aBorder, aParams.borderArea,
+ aParams.dirtyRect,
+ (aParams.paintFlags & PAINTBG_WILL_PAINT_BORDER),
+ appUnitsPerPixel, &currentLayerClipState);
+ }
+ SetupImageLayerClip(currentLayerClipState, &aRenderingCtx,
+ appUnitsPerPixel, &autoSR);
+ if (!clipBorderArea.IsEqualEdges(aParams.borderArea)) {
+ // We're drawing the background for the joined continuation boxes
+ // so we need to clip that to the slice that we want for this
+ // frame.
+ gfxRect clip = nsLayoutUtils::RectToGfxRect(aParams.borderArea,
+ appUnitsPerPixel);
+ autoSR.EnsureSaved(&aRenderingCtx);
+ aRenderingCtx.SnappedClip(clip);
+ }
+ }
+ }
+
+ // Skip the following layer preparing and painting code if the current
+ // layer is not selected for drawing.
+ if (aParams.layer >= 0 && i != (uint32_t)aParams.layer) {
+ continue;
+ }
+ nsBackgroundLayerState state = PrepareImageLayer(
+ &aParams.presCtx, aParams.frame, aParams.paintFlags, paintBorderArea,
+ clipState.mBGClipArea, layer, nullptr);
+ result &= state.mImageRenderer.PrepareResult();
+
+ // Skip the layer painting code if we found the dirty region is empty.
+ if (clipState.mDirtyRectInDevPx.IsEmpty()) {
+ continue;
+ }
+
+ if (!state.mFillArea.IsEmpty()) {
+ CompositionOp co = DetermineCompositionOp(aParams, layers, i);
+ if (co != CompositionOp::OP_OVER) {
+ NS_ASSERTION(aRenderingCtx.CurrentOp() == CompositionOp::OP_OVER,
+ "It is assumed the initial op is OP_OVER, when it is "
+ "restored later");
+ aRenderingCtx.SetOp(co);
+ }
+
+ result &= state.mImageRenderer.DrawLayer(
+ &aParams.presCtx, aRenderingCtx, state.mDestArea, state.mFillArea,
+ state.mAnchor + paintBorderArea.TopLeft(),
+ clipState.mDirtyRectInAppUnits, state.mRepeatSize, aParams.opacity);
+
+ if (co != CompositionOp::OP_OVER) {
+ aRenderingCtx.SetOp(CompositionOp::OP_OVER);
+ }
+ }
+ }
+
+ return result;
+}
+
+ImgDrawResult
+nsCSSRendering::BuildWebRenderDisplayItemsForStyleImageLayerWithSC(
+ const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
+ mozilla::wr::IpcResourceUpdateQueue& aResources,
+ const mozilla::layers::StackingContextHelper& aSc,
+ mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
+ ComputedStyle* aBackgroundSC, const nsStyleBorder& aBorder) {
+ MOZ_ASSERT(!(aParams.paintFlags & PAINTBG_MASK_IMAGE));
+
+ nscoord appUnitsPerPixel = aParams.presCtx.AppUnitsPerDevPixel();
+ ImageLayerClipState clipState;
+
+ clipState.mBGClipArea = *aParams.bgClipRect;
+ clipState.mCustomClip = true;
+ clipState.mHasRoundedCorners = false;
+ SetupDirtyRects(clipState.mBGClipArea, aParams.dirtyRect, appUnitsPerPixel,
+ &clipState.mDirtyRectInAppUnits,
+ &clipState.mDirtyRectInDevPx);
+
+ // Compute the outermost boundary of the area that might be painted.
+ // Same coordinate space as aParams.borderArea & aParams.bgClipRect.
+ Sides skipSides = aParams.frame->GetSkipSides();
+ nsRect paintBorderArea = BoxDecorationRectForBackground(
+ aParams.frame, aParams.borderArea, skipSides, &aBorder);
+
+ const nsStyleImageLayers& layers = aBackgroundSC->StyleBackground()->mImage;
+ const nsStyleImageLayers::Layer& layer = layers.mLayers[aParams.layer];
+
+ // Skip the following layer painting code if we found the dirty region is
+ // empty or the current layer is not selected for drawing.
+ if (clipState.mDirtyRectInDevPx.IsEmpty()) {
+ return ImgDrawResult::SUCCESS;
+ }
+
+ ImgDrawResult result = ImgDrawResult::SUCCESS;
+ nsBackgroundLayerState state =
+ PrepareImageLayer(&aParams.presCtx, aParams.frame, aParams.paintFlags,
+ paintBorderArea, clipState.mBGClipArea, layer, nullptr);
+ result &= state.mImageRenderer.PrepareResult();
+
+ if (!state.mFillArea.IsEmpty()) {
+ return state.mImageRenderer.BuildWebRenderDisplayItemsForLayer(
+ &aParams.presCtx, aBuilder, aResources, aSc, aManager, aItem,
+ state.mDestArea, state.mFillArea,
+ state.mAnchor + paintBorderArea.TopLeft(),
+ clipState.mDirtyRectInAppUnits, state.mRepeatSize, aParams.opacity);
+ }
+
+ return result;
+}
+
+nsRect nsCSSRendering::ComputeImageLayerPositioningArea(
+ nsPresContext* aPresContext, nsIFrame* aForFrame, const nsRect& aBorderArea,
+ const nsStyleImageLayers::Layer& aLayer, nsIFrame** aAttachedToFrame,
+ bool* aOutIsTransformedFixed) {
+ // Compute {background|mask} origin area relative to aBorderArea now as we
+ // may need it to compute the effective image size for a CSS gradient.
+ nsRect positionArea;
+
+ StyleGeometryBox layerOrigin = ComputeBoxValue(aForFrame, aLayer.mOrigin);
+
+ if (IsSVGStyleGeometryBox(layerOrigin)) {
+ MOZ_ASSERT(aForFrame->IsFrameOfType(nsIFrame::eSVG) &&
+ !aForFrame->IsSVGOuterSVGFrame());
+ *aAttachedToFrame = aForFrame;
+
+ positionArea = nsLayoutUtils::ComputeGeometryBox(aForFrame, layerOrigin);
+
+ nsPoint toStrokeBoxOffset = nsPoint(0, 0);
+ if (layerOrigin != StyleGeometryBox::StrokeBox) {
+ nsRect strokeBox = nsLayoutUtils::ComputeGeometryBox(
+ aForFrame, StyleGeometryBox::StrokeBox);
+ toStrokeBoxOffset = positionArea.TopLeft() - strokeBox.TopLeft();
+ }
+
+ // For SVG frames, the return value is relative to the stroke box
+ return nsRect(toStrokeBoxOffset, positionArea.Size());
+ }
+
+ MOZ_ASSERT(!aForFrame->IsFrameOfType(nsIFrame::eSVG) ||
+ aForFrame->IsSVGOuterSVGFrame());
+
+ LayoutFrameType frameType = aForFrame->Type();
+ nsIFrame* geometryFrame = aForFrame;
+ if (MOZ_UNLIKELY(frameType == LayoutFrameType::Scroll &&
+ StyleImageLayerAttachment::Local == aLayer.mAttachment)) {
+ nsIScrollableFrame* scrollableFrame = do_QueryFrame(aForFrame);
+ positionArea = nsRect(scrollableFrame->GetScrolledFrame()->GetPosition()
+ // For the dir=rtl case:
+ + scrollableFrame->GetScrollRange().TopLeft(),
+ scrollableFrame->GetScrolledRect().Size());
+ // The ScrolledRect’s size does not include the borders or scrollbars,
+ // reverse the handling of background-origin
+ // compared to the common case below.
+ if (layerOrigin == StyleGeometryBox::BorderBox) {
+ nsMargin border = geometryFrame->GetUsedBorder();
+ border.ApplySkipSides(geometryFrame->GetSkipSides());
+ positionArea.Inflate(border);
+ positionArea.Inflate(scrollableFrame->GetActualScrollbarSizes());
+ } else if (layerOrigin != StyleGeometryBox::PaddingBox) {
+ nsMargin padding = geometryFrame->GetUsedPadding();
+ padding.ApplySkipSides(geometryFrame->GetSkipSides());
+ positionArea.Deflate(padding);
+ NS_ASSERTION(layerOrigin == StyleGeometryBox::ContentBox,
+ "unknown background-origin value");
+ }
+ *aAttachedToFrame = aForFrame;
+ return positionArea;
+ }
+
+ if (MOZ_UNLIKELY(frameType == LayoutFrameType::Canvas)) {
+ geometryFrame = aForFrame->PrincipalChildList().FirstChild();
+ // geometryFrame might be null if this canvas is a page created
+ // as an overflow container (e.g. the in-flow content has already
+ // finished and this page only displays the continuations of
+ // absolutely positioned content).
+ if (geometryFrame) {
+ positionArea =
+ nsPlaceholderFrame::GetRealFrameFor(geometryFrame)->GetRect();
+ }
+ } else {
+ positionArea = nsRect(nsPoint(0, 0), aBorderArea.Size());
+ }
+
+ // See the comment of StyleGeometryBox::MarginBox.
+ // Hitting this assertion means we decide to turn on margin-box support for
+ // positioned mask from CSS parser and style system. In this case, you
+ // should *inflate* positionArea by the margin returning from
+ // geometryFrame->GetUsedMargin() in the code chunk bellow.
+ MOZ_ASSERT(aLayer.mOrigin != StyleGeometryBox::MarginBox,
+ "StyleGeometryBox::MarginBox rendering is not supported yet.\n");
+
+ // {background|mask} images are tiled over the '{background|mask}-clip' area
+ // but the origin of the tiling is based on the '{background|mask}-origin'
+ // area.
+ if (layerOrigin != StyleGeometryBox::BorderBox && geometryFrame) {
+ nsMargin border = geometryFrame->GetUsedBorder();
+ if (layerOrigin != StyleGeometryBox::PaddingBox) {
+ border += geometryFrame->GetUsedPadding();
+ NS_ASSERTION(layerOrigin == StyleGeometryBox::ContentBox,
+ "unknown background-origin value");
+ }
+ positionArea.Deflate(border);
+ }
+
+ nsIFrame* attachedToFrame = aForFrame;
+ if (StyleImageLayerAttachment::Fixed == aLayer.mAttachment) {
+ // If it's a fixed background attachment, then the image is placed
+ // relative to the viewport, which is the area of the root frame
+ // in a screen context or the page content frame in a print context.
+ attachedToFrame = aPresContext->PresShell()->GetRootFrame();
+ NS_ASSERTION(attachedToFrame, "no root frame");
+ nsIFrame* pageContentFrame = nullptr;
+ if (aPresContext->IsPaginated()) {
+ pageContentFrame = nsLayoutUtils::GetClosestFrameOfType(
+ aForFrame, LayoutFrameType::PageContent);
+ if (pageContentFrame) {
+ attachedToFrame = pageContentFrame;
+ }
+ // else this is an embedded shell and its root frame is what we want
+ }
+
+ // If the background is affected by a transform, treat is as if it
+ // wasn't fixed.
+ if (nsLayoutUtils::IsTransformed(aForFrame, attachedToFrame)) {
+ attachedToFrame = aForFrame;
+ *aOutIsTransformedFixed = true;
+ } else {
+ // Set the background positioning area to the viewport's area
+ // (relative to aForFrame)
+ positionArea = nsRect(-aForFrame->GetOffsetTo(attachedToFrame),
+ attachedToFrame->GetSize());
+
+ if (!pageContentFrame) {
+ // Subtract the size of scrollbars.
+ nsIScrollableFrame* scrollableFrame =
+ aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
+ if (scrollableFrame) {
+ nsMargin scrollbars = scrollableFrame->GetActualScrollbarSizes();
+ positionArea.Deflate(scrollbars);
+ }
+ }
+ }
+ }
+ *aAttachedToFrame = attachedToFrame;
+
+ return positionArea;
+}
+
+/* static */
+nscoord nsCSSRendering::ComputeRoundedSize(nscoord aCurrentSize,
+ nscoord aPositioningSize) {
+ float repeatCount = NS_roundf(float(aPositioningSize) / float(aCurrentSize));
+ if (repeatCount < 1.0f) {
+ return aPositioningSize;
+ }
+ return nscoord(NS_lround(float(aPositioningSize) / repeatCount));
+}
+
+// Apply the CSS image sizing algorithm as it applies to background images.
+// See http://www.w3.org/TR/css3-background/#the-background-size .
+// aIntrinsicSize is the size that the background image 'would like to be'.
+// It can be found by calling nsImageRenderer::ComputeIntrinsicSize.
+static nsSize ComputeDrawnSizeForBackground(
+ const CSSSizeOrRatio& aIntrinsicSize, const nsSize& aBgPositioningArea,
+ const StyleBackgroundSize& aLayerSize, StyleImageLayerRepeat aXRepeat,
+ StyleImageLayerRepeat aYRepeat) {
+ nsSize imageSize;
+
+ // Size is dictated by cover or contain rules.
+ if (aLayerSize.IsContain() || aLayerSize.IsCover()) {
+ nsImageRenderer::FitType fitType = aLayerSize.IsCover()
+ ? nsImageRenderer::COVER
+ : nsImageRenderer::CONTAIN;
+ imageSize = nsImageRenderer::ComputeConstrainedSize(
+ aBgPositioningArea, aIntrinsicSize.mRatio, fitType);
+ } else {
+ MOZ_ASSERT(aLayerSize.IsExplicitSize());
+ const auto& width = aLayerSize.explicit_size.width;
+ const auto& height = aLayerSize.explicit_size.height;
+ // No cover/contain constraint, use default algorithm.
+ CSSSizeOrRatio specifiedSize;
+ if (width.IsLengthPercentage()) {
+ specifiedSize.SetWidth(
+ width.AsLengthPercentage().Resolve(aBgPositioningArea.width));
+ }
+ if (height.IsLengthPercentage()) {
+ specifiedSize.SetHeight(
+ height.AsLengthPercentage().Resolve(aBgPositioningArea.height));
+ }
+
+ imageSize = nsImageRenderer::ComputeConcreteSize(
+ specifiedSize, aIntrinsicSize, aBgPositioningArea);
+ }
+
+ // See https://www.w3.org/TR/css3-background/#background-size .
+ // "If 'background-repeat' is 'round' for one (or both) dimensions, there is a
+ // second
+ // step. The UA must scale the image in that dimension (or both dimensions)
+ // so that it fits a whole number of times in the background positioning
+ // area."
+ // "If 'background-repeat' is 'round' for one dimension only and if
+ // 'background-size'
+ // is 'auto' for the other dimension, then there is a third step: that other
+ // dimension is scaled so that the original aspect ratio is restored."
+ bool isRepeatRoundInBothDimensions =
+ aXRepeat == StyleImageLayerRepeat::Round &&
+ aYRepeat == StyleImageLayerRepeat::Round;
+
+ // Calculate the rounded size only if the background-size computation
+ // returned a correct size for the image.
+ if (imageSize.width && aXRepeat == StyleImageLayerRepeat::Round) {
+ imageSize.width = nsCSSRendering::ComputeRoundedSize(
+ imageSize.width, aBgPositioningArea.width);
+ if (!isRepeatRoundInBothDimensions && aLayerSize.IsExplicitSize() &&
+ aLayerSize.explicit_size.height.IsAuto()) {
+ // Restore intrinsic ratio
+ if (aIntrinsicSize.mRatio) {
+ imageSize.height =
+ aIntrinsicSize.mRatio.Inverted().ApplyTo(imageSize.width);
+ }
+ }
+ }
+
+ // Calculate the rounded size only if the background-size computation
+ // returned a correct size for the image.
+ if (imageSize.height && aYRepeat == StyleImageLayerRepeat::Round) {
+ imageSize.height = nsCSSRendering::ComputeRoundedSize(
+ imageSize.height, aBgPositioningArea.height);
+ if (!isRepeatRoundInBothDimensions && aLayerSize.IsExplicitSize() &&
+ aLayerSize.explicit_size.width.IsAuto()) {
+ // Restore intrinsic ratio
+ if (aIntrinsicSize.mRatio) {
+ imageSize.width = aIntrinsicSize.mRatio.ApplyTo(imageSize.height);
+ }
+ }
+ }
+
+ return imageSize;
+}
+
+/* ComputeSpacedRepeatSize
+ * aImageDimension: the image width/height
+ * aAvailableSpace: the background positioning area width/height
+ * aRepeat: determine whether the image is repeated
+ * Returns the image size plus gap size of app units for use as spacing
+ */
+static nscoord ComputeSpacedRepeatSize(nscoord aImageDimension,
+ nscoord aAvailableSpace, bool& aRepeat) {
+ float ratio = static_cast<float>(aAvailableSpace) / aImageDimension;
+
+ if (ratio < 2.0f) { // If you can't repeat at least twice, then don't repeat.
+ aRepeat = false;
+ return aImageDimension;
+ }
+
+ aRepeat = true;
+ return (aAvailableSpace - aImageDimension) / (NSToIntFloor(ratio) - 1);
+}
+
+/* static */
+nscoord nsCSSRendering::ComputeBorderSpacedRepeatSize(nscoord aImageDimension,
+ nscoord aAvailableSpace,
+ nscoord& aSpace) {
+ int32_t count = aImageDimension ? (aAvailableSpace / aImageDimension) : 0;
+ aSpace = (aAvailableSpace - aImageDimension * count) / (count + 1);
+ return aSpace + aImageDimension;
+}
+
+nsBackgroundLayerState nsCSSRendering::PrepareImageLayer(
+ nsPresContext* aPresContext, nsIFrame* aForFrame, uint32_t aFlags,
+ const nsRect& aBorderArea, const nsRect& aBGClipRect,
+ const nsStyleImageLayers::Layer& aLayer, bool* aOutIsTransformedFixed) {
+ /*
+ * The properties we need to keep in mind when drawing style image
+ * layers are:
+ *
+ * background-image/ mask-image
+ * background-repeat/ mask-repeat
+ * background-attachment
+ * background-position/ mask-position
+ * background-clip/ mask-clip
+ * background-origin/ mask-origin
+ * background-size/ mask-size
+ * background-blend-mode
+ * box-decoration-break
+ * mask-mode
+ * mask-composite
+ *
+ * (background-color applies to the entire element and not to individual
+ * layers, so it is irrelevant to this method.)
+ *
+ * These properties have the following dependencies upon each other when
+ * determining rendering:
+ *
+ * background-image/ mask-image
+ * no dependencies
+ * background-repeat/ mask-repeat
+ * no dependencies
+ * background-attachment
+ * no dependencies
+ * background-position/ mask-position
+ * depends upon background-size/mask-size (for the image's scaled size)
+ * and background-break (for the background positioning area)
+ * background-clip/ mask-clip
+ * no dependencies
+ * background-origin/ mask-origin
+ * depends upon background-attachment (only in the case where that value
+ * is 'fixed')
+ * background-size/ mask-size
+ * depends upon box-decoration-break (for the background positioning area
+ * for resolving percentages), background-image (for the image's intrinsic
+ * size), background-repeat (if that value is 'round'), and
+ * background-origin (for the background painting area, when
+ * background-repeat is 'round')
+ * background-blend-mode
+ * no dependencies
+ * mask-mode
+ * no dependencies
+ * mask-composite
+ * no dependencies
+ * box-decoration-break
+ * no dependencies
+ *
+ * As a result of only-if dependencies we don't strictly do a topological
+ * sort of the above properties when processing, but it's pretty close to one:
+ *
+ * background-clip/mask-clip (by caller)
+ * background-image/ mask-image
+ * box-decoration-break, background-origin/ mask origin
+ * background-attachment (postfix for background-origin if 'fixed')
+ * background-size/ mask-size
+ * background-position/ mask-position
+ * background-repeat/ mask-repeat
+ */
+
+ uint32_t irFlags = 0;
+ if (aFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES) {
+ irFlags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
+ }
+ if (aFlags & nsCSSRendering::PAINTBG_TO_WINDOW) {
+ irFlags |= nsImageRenderer::FLAG_PAINTING_TO_WINDOW;
+ }
+ if (aFlags & nsCSSRendering::PAINTBG_HIGH_QUALITY_SCALING) {
+ irFlags |= nsImageRenderer::FLAG_HIGH_QUALITY_SCALING;
+ }
+
+ nsBackgroundLayerState state(aForFrame, &aLayer.mImage, irFlags);
+ if (!state.mImageRenderer.PrepareImage()) {
+ // There's no image or it's not ready to be painted.
+ if (aOutIsTransformedFixed &&
+ StyleImageLayerAttachment::Fixed == aLayer.mAttachment) {
+ nsIFrame* attachedToFrame = aPresContext->PresShell()->GetRootFrame();
+ NS_ASSERTION(attachedToFrame, "no root frame");
+ nsIFrame* pageContentFrame = nullptr;
+ if (aPresContext->IsPaginated()) {
+ pageContentFrame = nsLayoutUtils::GetClosestFrameOfType(
+ aForFrame, LayoutFrameType::PageContent);
+ if (pageContentFrame) {
+ attachedToFrame = pageContentFrame;
+ }
+ // else this is an embedded shell and its root frame is what we want
+ }
+
+ *aOutIsTransformedFixed =
+ nsLayoutUtils::IsTransformed(aForFrame, attachedToFrame);
+ }
+ return state;
+ }
+
+ // The frame to which the background is attached
+ nsIFrame* attachedToFrame = aForFrame;
+ // Is the background marked 'fixed', but affected by a transform?
+ bool transformedFixed = false;
+ // Compute background origin area relative to aBorderArea now as we may need
+ // it to compute the effective image size for a CSS gradient.
+ nsRect positionArea = ComputeImageLayerPositioningArea(
+ aPresContext, aForFrame, aBorderArea, aLayer, &attachedToFrame,
+ &transformedFixed);
+ if (aOutIsTransformedFixed) {
+ *aOutIsTransformedFixed = transformedFixed;
+ }
+
+ // For background-attachment:fixed backgrounds, we'll override the area
+ // where the background can be drawn to the viewport.
+ nsRect bgClipRect = aBGClipRect;
+
+ if (StyleImageLayerAttachment::Fixed == aLayer.mAttachment &&
+ !transformedFixed && (aFlags & nsCSSRendering::PAINTBG_TO_WINDOW)) {
+ bgClipRect = positionArea + aBorderArea.TopLeft();
+ }
+
+ StyleImageLayerRepeat repeatX = aLayer.mRepeat.mXRepeat;
+ StyleImageLayerRepeat repeatY = aLayer.mRepeat.mYRepeat;
+
+ // Scale the image as specified for background-size and background-repeat.
+ // Also as required for proper background positioning when background-position
+ // is defined with percentages.
+ CSSSizeOrRatio intrinsicSize = state.mImageRenderer.ComputeIntrinsicSize();
+ nsSize bgPositionSize = positionArea.Size();
+ nsSize imageSize = ComputeDrawnSizeForBackground(
+ intrinsicSize, bgPositionSize, aLayer.mSize, repeatX, repeatY);
+
+ if (imageSize.width <= 0 || imageSize.height <= 0) return state;
+
+ state.mImageRenderer.SetPreferredSize(intrinsicSize, imageSize);
+
+ // Compute the anchor point.
+ //
+ // relative to aBorderArea.TopLeft() (which is where the top-left
+ // of aForFrame's border-box will be rendered)
+ nsPoint imageTopLeft;
+
+ // Compute the position of the background now that the background's size is
+ // determined.
+ nsImageRenderer::ComputeObjectAnchorPoint(aLayer.mPosition, bgPositionSize,
+ imageSize, &imageTopLeft,
+ &state.mAnchor);
+ state.mRepeatSize = imageSize;
+ if (repeatX == StyleImageLayerRepeat::Space) {
+ bool isRepeat;
+ state.mRepeatSize.width = ComputeSpacedRepeatSize(
+ imageSize.width, bgPositionSize.width, isRepeat);
+ if (isRepeat) {
+ imageTopLeft.x = 0;
+ state.mAnchor.x = 0;
+ } else {
+ repeatX = StyleImageLayerRepeat::NoRepeat;
+ }
+ }
+
+ if (repeatY == StyleImageLayerRepeat::Space) {
+ bool isRepeat;
+ state.mRepeatSize.height = ComputeSpacedRepeatSize(
+ imageSize.height, bgPositionSize.height, isRepeat);
+ if (isRepeat) {
+ imageTopLeft.y = 0;
+ state.mAnchor.y = 0;
+ } else {
+ repeatY = StyleImageLayerRepeat::NoRepeat;
+ }
+ }
+
+ imageTopLeft += positionArea.TopLeft();
+ state.mAnchor += positionArea.TopLeft();
+ state.mDestArea = nsRect(imageTopLeft + aBorderArea.TopLeft(), imageSize);
+ state.mFillArea = state.mDestArea;
+
+ ExtendMode repeatMode = ExtendMode::CLAMP;
+ if (repeatX == StyleImageLayerRepeat::Repeat ||
+ repeatX == StyleImageLayerRepeat::Round ||
+ repeatX == StyleImageLayerRepeat::Space) {
+ state.mFillArea.x = bgClipRect.x;
+ state.mFillArea.width = bgClipRect.width;
+ repeatMode = ExtendMode::REPEAT_X;
+ }
+ if (repeatY == StyleImageLayerRepeat::Repeat ||
+ repeatY == StyleImageLayerRepeat::Round ||
+ repeatY == StyleImageLayerRepeat::Space) {
+ state.mFillArea.y = bgClipRect.y;
+ state.mFillArea.height = bgClipRect.height;
+
+ /***
+ * We're repeating on the X axis already,
+ * so if we have to repeat in the Y axis,
+ * we really need to repeat in both directions.
+ */
+ if (repeatMode == ExtendMode::REPEAT_X) {
+ repeatMode = ExtendMode::REPEAT;
+ } else {
+ repeatMode = ExtendMode::REPEAT_Y;
+ }
+ }
+ state.mImageRenderer.SetExtendMode(repeatMode);
+ state.mImageRenderer.SetMaskOp(aLayer.mMaskMode);
+
+ state.mFillArea.IntersectRect(state.mFillArea, bgClipRect);
+
+ return state;
+}
+
+nsRect nsCSSRendering::GetBackgroundLayerRect(
+ nsPresContext* aPresContext, nsIFrame* aForFrame, const nsRect& aBorderArea,
+ const nsRect& aClipRect, const nsStyleImageLayers::Layer& aLayer,
+ uint32_t aFlags) {
+ Sides skipSides = aForFrame->GetSkipSides();
+ nsRect borderArea =
+ BoxDecorationRectForBackground(aForFrame, aBorderArea, skipSides);
+ nsBackgroundLayerState state = PrepareImageLayer(
+ aPresContext, aForFrame, aFlags, borderArea, aClipRect, aLayer);
+ return state.mFillArea;
+}
+
+// Begin table border-collapsing section
+// These functions were written to not disrupt the normal ones and yet satisfy
+// some additional requirements At some point, all functions should be unified
+// to include the additional functionality that these provide
+
+static nscoord RoundIntToPixel(nscoord aValue, nscoord aOneDevPixel,
+ bool aRoundDown = false) {
+ if (aOneDevPixel <= 0) {
+ // We must be rendering to a device that has a resolution greater than
+ // one device pixel!
+ // In that case, aValue is as accurate as it's going to get.
+ return aValue;
+ }
+
+ nscoord halfPixel = NSToCoordRound(aOneDevPixel / 2.0f);
+ nscoord extra = aValue % aOneDevPixel;
+ nscoord finalValue = (!aRoundDown && (extra >= halfPixel))
+ ? aValue + (aOneDevPixel - extra)
+ : aValue - extra;
+ return finalValue;
+}
+
+static nscoord RoundFloatToPixel(float aValue, nscoord aOneDevPixel,
+ bool aRoundDown = false) {
+ return RoundIntToPixel(NSToCoordRound(aValue), aOneDevPixel, aRoundDown);
+}
+
+static void SetPoly(const Rect& aRect, Point* poly) {
+ poly[0].x = aRect.x;
+ poly[0].y = aRect.y;
+ poly[1].x = aRect.x + aRect.width;
+ poly[1].y = aRect.y;
+ poly[2].x = aRect.x + aRect.width;
+ poly[2].y = aRect.y + aRect.height;
+ poly[3].x = aRect.x;
+ poly[3].y = aRect.y + aRect.height;
+}
+
+static void DrawDashedSegment(DrawTarget& aDrawTarget, nsRect aRect,
+ nscoord aDashLength, nscolor aColor,
+ int32_t aAppUnitsPerDevPixel, bool aHorizontal) {
+ ColorPattern color(ToDeviceColor(aColor));
+ DrawOptions drawOptions(1.f, CompositionOp::OP_OVER, AntialiasMode::NONE);
+ StrokeOptions strokeOptions;
+
+ Float dash[2];
+ dash[0] = Float(aDashLength) / aAppUnitsPerDevPixel;
+ dash[1] = dash[0];
+
+ strokeOptions.mDashPattern = dash;
+ strokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
+
+ if (aHorizontal) {
+ nsPoint left = (aRect.TopLeft() + aRect.BottomLeft()) / 2;
+ nsPoint right = (aRect.TopRight() + aRect.BottomRight()) / 2;
+ strokeOptions.mLineWidth = Float(aRect.height) / aAppUnitsPerDevPixel;
+ StrokeLineWithSnapping(left, right, aAppUnitsPerDevPixel, aDrawTarget,
+ color, strokeOptions, drawOptions);
+ } else {
+ nsPoint top = (aRect.TopLeft() + aRect.TopRight()) / 2;
+ nsPoint bottom = (aRect.BottomLeft() + aRect.BottomRight()) / 2;
+ strokeOptions.mLineWidth = Float(aRect.width) / aAppUnitsPerDevPixel;
+ StrokeLineWithSnapping(top, bottom, aAppUnitsPerDevPixel, aDrawTarget,
+ color, strokeOptions, drawOptions);
+ }
+}
+
+static void DrawSolidBorderSegment(
+ DrawTarget& aDrawTarget, nsRect aRect, nscolor aColor,
+ int32_t aAppUnitsPerDevPixel,
+ mozilla::Side aStartBevelSide = mozilla::eSideTop,
+ nscoord aStartBevelOffset = 0,
+ mozilla::Side aEndBevelSide = mozilla::eSideTop,
+ nscoord aEndBevelOffset = 0) {
+ ColorPattern color(ToDeviceColor(aColor));
+ DrawOptions drawOptions(1.f, CompositionOp::OP_OVER, AntialiasMode::NONE);
+
+ nscoord oneDevPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerDevPixel);
+ // We don't need to bevel single pixel borders
+ if ((aRect.width == oneDevPixel) || (aRect.height == oneDevPixel) ||
+ ((0 == aStartBevelOffset) && (0 == aEndBevelOffset))) {
+ // simple rectangle
+ aDrawTarget.FillRect(
+ NSRectToSnappedRect(aRect, aAppUnitsPerDevPixel, aDrawTarget), color,
+ drawOptions);
+ } else {
+ // polygon with beveling
+ Point poly[4];
+ SetPoly(NSRectToSnappedRect(aRect, aAppUnitsPerDevPixel, aDrawTarget),
+ poly);
+
+ Float startBevelOffset =
+ NSAppUnitsToFloatPixels(aStartBevelOffset, aAppUnitsPerDevPixel);
+ switch (aStartBevelSide) {
+ case eSideTop:
+ poly[0].x += startBevelOffset;
+ break;
+ case eSideBottom:
+ poly[3].x += startBevelOffset;
+ break;
+ case eSideRight:
+ poly[1].y += startBevelOffset;
+ break;
+ case eSideLeft:
+ poly[0].y += startBevelOffset;
+ }
+
+ Float endBevelOffset =
+ NSAppUnitsToFloatPixels(aEndBevelOffset, aAppUnitsPerDevPixel);
+ switch (aEndBevelSide) {
+ case eSideTop:
+ poly[1].x -= endBevelOffset;
+ break;
+ case eSideBottom:
+ poly[2].x -= endBevelOffset;
+ break;
+ case eSideRight:
+ poly[2].y -= endBevelOffset;
+ break;
+ case eSideLeft:
+ poly[3].y -= endBevelOffset;
+ }
+
+ RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+ builder->MoveTo(poly[0]);
+ builder->LineTo(poly[1]);
+ builder->LineTo(poly[2]);
+ builder->LineTo(poly[3]);
+ builder->Close();
+ RefPtr<Path> path = builder->Finish();
+ aDrawTarget.Fill(path, color, drawOptions);
+ }
+}
+
+static void GetDashInfo(nscoord aBorderLength, nscoord aDashLength,
+ nscoord aOneDevPixel, int32_t& aNumDashSpaces,
+ nscoord& aStartDashLength, nscoord& aEndDashLength) {
+ aNumDashSpaces = 0;
+ if (aStartDashLength + aDashLength + aEndDashLength >= aBorderLength) {
+ aStartDashLength = aBorderLength;
+ aEndDashLength = 0;
+ } else {
+ aNumDashSpaces =
+ (aBorderLength - aDashLength) / (2 * aDashLength); // round down
+ nscoord extra = aBorderLength - aStartDashLength - aEndDashLength -
+ (((2 * aNumDashSpaces) - 1) * aDashLength);
+ if (extra > 0) {
+ nscoord half = RoundIntToPixel(extra / 2, aOneDevPixel);
+ aStartDashLength += half;
+ aEndDashLength += (extra - half);
+ }
+ }
+}
+
+void nsCSSRendering::DrawTableBorderSegment(
+ DrawTarget& aDrawTarget, StyleBorderStyle aBorderStyle,
+ nscolor aBorderColor, const nsRect& aBorder, int32_t aAppUnitsPerDevPixel,
+ mozilla::Side aStartBevelSide, nscoord aStartBevelOffset,
+ mozilla::Side aEndBevelSide, nscoord aEndBevelOffset) {
+ bool horizontal =
+ ((eSideTop == aStartBevelSide) || (eSideBottom == aStartBevelSide));
+ nscoord oneDevPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerDevPixel);
+
+ if ((oneDevPixel >= aBorder.width) || (oneDevPixel >= aBorder.height) ||
+ (StyleBorderStyle::Dashed == aBorderStyle) ||
+ (StyleBorderStyle::Dotted == aBorderStyle)) {
+ // no beveling for 1 pixel border, dash or dot
+ aStartBevelOffset = 0;
+ aEndBevelOffset = 0;
+ }
+
+ switch (aBorderStyle) {
+ case StyleBorderStyle::None:
+ case StyleBorderStyle::Hidden:
+ // NS_ASSERTION(false, "style of none or hidden");
+ break;
+ case StyleBorderStyle::Dotted:
+ case StyleBorderStyle::Dashed: {
+ nscoord dashLength =
+ (StyleBorderStyle::Dashed == aBorderStyle) ? DASH_LENGTH : DOT_LENGTH;
+ // make the dash length proportional to the border thickness
+ dashLength *= (horizontal) ? aBorder.height : aBorder.width;
+ // make the min dash length for the ends 1/2 the dash length
+ nscoord minDashLength =
+ (StyleBorderStyle::Dashed == aBorderStyle)
+ ? RoundFloatToPixel(((float)dashLength) / 2.0f,
+ aAppUnitsPerDevPixel)
+ : dashLength;
+ minDashLength = std::max(minDashLength, oneDevPixel);
+ nscoord numDashSpaces = 0;
+ nscoord startDashLength = minDashLength;
+ nscoord endDashLength = minDashLength;
+ if (horizontal) {
+ GetDashInfo(aBorder.width, dashLength, aAppUnitsPerDevPixel,
+ numDashSpaces, startDashLength, endDashLength);
+ nsRect rect(aBorder.x, aBorder.y, startDashLength, aBorder.height);
+ DrawSolidBorderSegment(aDrawTarget, rect, aBorderColor,
+ aAppUnitsPerDevPixel);
+
+ rect.x += startDashLength + dashLength;
+ rect.width =
+ aBorder.width - (startDashLength + endDashLength + dashLength);
+ DrawDashedSegment(aDrawTarget, rect, dashLength, aBorderColor,
+ aAppUnitsPerDevPixel, horizontal);
+
+ rect.x += rect.width;
+ rect.width = endDashLength;
+ DrawSolidBorderSegment(aDrawTarget, rect, aBorderColor,
+ aAppUnitsPerDevPixel);
+ } else {
+ GetDashInfo(aBorder.height, dashLength, aAppUnitsPerDevPixel,
+ numDashSpaces, startDashLength, endDashLength);
+ nsRect rect(aBorder.x, aBorder.y, aBorder.width, startDashLength);
+ DrawSolidBorderSegment(aDrawTarget, rect, aBorderColor,
+ aAppUnitsPerDevPixel);
+
+ rect.y += rect.height + dashLength;
+ rect.height =
+ aBorder.height - (startDashLength + endDashLength + dashLength);
+ DrawDashedSegment(aDrawTarget, rect, dashLength, aBorderColor,
+ aAppUnitsPerDevPixel, horizontal);
+
+ rect.y += rect.height;
+ rect.height = endDashLength;
+ DrawSolidBorderSegment(aDrawTarget, rect, aBorderColor,
+ aAppUnitsPerDevPixel);
+ }
+ } break;
+ default:
+ AutoTArray<SolidBeveledBorderSegment, 3> segments;
+ GetTableBorderSolidSegments(
+ segments, aBorderStyle, aBorderColor, aBorder, aAppUnitsPerDevPixel,
+ aStartBevelSide, aStartBevelOffset, aEndBevelSide, aEndBevelOffset);
+ for (const auto& segment : segments) {
+ DrawSolidBorderSegment(
+ aDrawTarget, segment.mRect, segment.mColor, aAppUnitsPerDevPixel,
+ segment.mStartBevel.mSide, segment.mStartBevel.mOffset,
+ segment.mEndBevel.mSide, segment.mEndBevel.mOffset);
+ }
+ break;
+ }
+}
+
+void nsCSSRendering::GetTableBorderSolidSegments(
+ nsTArray<SolidBeveledBorderSegment>& aSegments,
+ StyleBorderStyle aBorderStyle, nscolor aBorderColor, const nsRect& aBorder,
+ int32_t aAppUnitsPerDevPixel, mozilla::Side aStartBevelSide,
+ nscoord aStartBevelOffset, mozilla::Side aEndBevelSide,
+ nscoord aEndBevelOffset) {
+ const bool horizontal =
+ eSideTop == aStartBevelSide || eSideBottom == aStartBevelSide;
+ const nscoord oneDevPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerDevPixel);
+
+ switch (aBorderStyle) {
+ case StyleBorderStyle::None:
+ case StyleBorderStyle::Hidden:
+ return;
+ case StyleBorderStyle::Dotted:
+ case StyleBorderStyle::Dashed:
+ MOZ_ASSERT_UNREACHABLE("Caller should have checked");
+ return;
+ case StyleBorderStyle::Groove:
+ case StyleBorderStyle::Ridge:
+ if ((horizontal && (oneDevPixel >= aBorder.height)) ||
+ (!horizontal && (oneDevPixel >= aBorder.width))) {
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{aBorder,
+ aBorderColor,
+ {aStartBevelSide, aStartBevelOffset},
+ {aEndBevelSide, aEndBevelOffset}});
+ } else {
+ nscoord startBevel =
+ (aStartBevelOffset > 0)
+ ? RoundFloatToPixel(0.5f * (float)aStartBevelOffset,
+ aAppUnitsPerDevPixel, true)
+ : 0;
+ nscoord endBevel =
+ (aEndBevelOffset > 0)
+ ? RoundFloatToPixel(0.5f * (float)aEndBevelOffset,
+ aAppUnitsPerDevPixel, true)
+ : 0;
+ mozilla::Side ridgeGrooveSide = (horizontal) ? eSideTop : eSideLeft;
+ // FIXME: In theory, this should use the visited-dependent
+ // background color, but I don't care.
+ nscolor bevelColor =
+ MakeBevelColor(ridgeGrooveSide, aBorderStyle, aBorderColor);
+ nsRect rect(aBorder);
+ nscoord half;
+ if (horizontal) { // top, bottom
+ half = RoundFloatToPixel(0.5f * (float)aBorder.height,
+ aAppUnitsPerDevPixel);
+ rect.height = half;
+ if (eSideTop == aStartBevelSide) {
+ rect.x += startBevel;
+ rect.width -= startBevel;
+ }
+ if (eSideTop == aEndBevelSide) {
+ rect.width -= endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{rect,
+ bevelColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ } else { // left, right
+ half = RoundFloatToPixel(0.5f * (float)aBorder.width,
+ aAppUnitsPerDevPixel);
+ rect.width = half;
+ if (eSideLeft == aStartBevelSide) {
+ rect.y += startBevel;
+ rect.height -= startBevel;
+ }
+ if (eSideLeft == aEndBevelSide) {
+ rect.height -= endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{rect,
+ bevelColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ }
+
+ rect = aBorder;
+ ridgeGrooveSide =
+ (eSideTop == ridgeGrooveSide) ? eSideBottom : eSideRight;
+ // FIXME: In theory, this should use the visited-dependent
+ // background color, but I don't care.
+ bevelColor =
+ MakeBevelColor(ridgeGrooveSide, aBorderStyle, aBorderColor);
+ if (horizontal) {
+ rect.y = rect.y + half;
+ rect.height = aBorder.height - half;
+ if (eSideBottom == aStartBevelSide) {
+ rect.x += startBevel;
+ rect.width -= startBevel;
+ }
+ if (eSideBottom == aEndBevelSide) {
+ rect.width -= endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{rect,
+ bevelColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ } else {
+ rect.x = rect.x + half;
+ rect.width = aBorder.width - half;
+ if (eSideRight == aStartBevelSide) {
+ rect.y += aStartBevelOffset - startBevel;
+ rect.height -= startBevel;
+ }
+ if (eSideRight == aEndBevelSide) {
+ rect.height -= endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{rect,
+ bevelColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ }
+ }
+ break;
+ case StyleBorderStyle::Double:
+ // We can only do "double" borders if the thickness of the border
+ // is more than 2px. Otherwise, we fall through to painting a
+ // solid border.
+ if ((aBorder.width > 2 * oneDevPixel || horizontal) &&
+ (aBorder.height > 2 * oneDevPixel || !horizontal)) {
+ nscoord startBevel =
+ (aStartBevelOffset > 0)
+ ? RoundFloatToPixel(0.333333f * (float)aStartBevelOffset,
+ aAppUnitsPerDevPixel)
+ : 0;
+ nscoord endBevel =
+ (aEndBevelOffset > 0)
+ ? RoundFloatToPixel(0.333333f * (float)aEndBevelOffset,
+ aAppUnitsPerDevPixel)
+ : 0;
+ if (horizontal) { // top, bottom
+ nscoord thirdHeight = RoundFloatToPixel(
+ 0.333333f * (float)aBorder.height, aAppUnitsPerDevPixel);
+
+ // draw the top line or rect
+ nsRect topRect(aBorder.x, aBorder.y, aBorder.width, thirdHeight);
+ if (eSideTop == aStartBevelSide) {
+ topRect.x += aStartBevelOffset - startBevel;
+ topRect.width -= aStartBevelOffset - startBevel;
+ }
+ if (eSideTop == aEndBevelSide) {
+ topRect.width -= aEndBevelOffset - endBevel;
+ }
+
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{topRect,
+ aBorderColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+
+ // draw the botom line or rect
+ nscoord heightOffset = aBorder.height - thirdHeight;
+ nsRect bottomRect(aBorder.x, aBorder.y + heightOffset, aBorder.width,
+ aBorder.height - heightOffset);
+ if (eSideBottom == aStartBevelSide) {
+ bottomRect.x += aStartBevelOffset - startBevel;
+ bottomRect.width -= aStartBevelOffset - startBevel;
+ }
+ if (eSideBottom == aEndBevelSide) {
+ bottomRect.width -= aEndBevelOffset - endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{bottomRect,
+ aBorderColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ } else { // left, right
+ nscoord thirdWidth = RoundFloatToPixel(
+ 0.333333f * (float)aBorder.width, aAppUnitsPerDevPixel);
+
+ nsRect leftRect(aBorder.x, aBorder.y, thirdWidth, aBorder.height);
+ if (eSideLeft == aStartBevelSide) {
+ leftRect.y += aStartBevelOffset - startBevel;
+ leftRect.height -= aStartBevelOffset - startBevel;
+ }
+ if (eSideLeft == aEndBevelSide) {
+ leftRect.height -= aEndBevelOffset - endBevel;
+ }
+
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{leftRect,
+ aBorderColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+
+ nscoord widthOffset = aBorder.width - thirdWidth;
+ nsRect rightRect(aBorder.x + widthOffset, aBorder.y,
+ aBorder.width - widthOffset, aBorder.height);
+ if (eSideRight == aStartBevelSide) {
+ rightRect.y += aStartBevelOffset - startBevel;
+ rightRect.height -= aStartBevelOffset - startBevel;
+ }
+ if (eSideRight == aEndBevelSide) {
+ rightRect.height -= aEndBevelOffset - endBevel;
+ }
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{rightRect,
+ aBorderColor,
+ {aStartBevelSide, startBevel},
+ {aEndBevelSide, endBevel}});
+ }
+ break;
+ }
+ // else fall through to solid
+ [[fallthrough]];
+ case StyleBorderStyle::Solid:
+ aSegments.AppendElement(
+ SolidBeveledBorderSegment{aBorder,
+ aBorderColor,
+ {aStartBevelSide, aStartBevelOffset},
+ {aEndBevelSide, aEndBevelOffset}});
+ break;
+ case StyleBorderStyle::Outset:
+ case StyleBorderStyle::Inset:
+ MOZ_ASSERT_UNREACHABLE(
+ "inset, outset should have been converted to groove, ridge");
+ break;
+ }
+}
+
+// End table border-collapsing section
+
+Rect nsCSSRendering::ExpandPaintingRectForDecorationLine(
+ nsIFrame* aFrame, const uint8_t aStyle, const Rect& aClippedRect,
+ const Float aICoordInFrame, const Float aCycleLength, bool aVertical) {
+ switch (aStyle) {
+ case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
+ case NS_STYLE_TEXT_DECORATION_STYLE_DASHED:
+ case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
+ break;
+ default:
+ NS_ERROR("Invalid style was specified");
+ return aClippedRect;
+ }
+
+ nsBlockFrame* block = nullptr;
+ // Note that when we paint the decoration lines in relative positioned
+ // box, we should paint them like all of the boxes are positioned as static.
+ nscoord framePosInBlockAppUnits = 0;
+ for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
+ block = do_QueryFrame(f);
+ if (block) {
+ break;
+ }
+ framePosInBlockAppUnits +=
+ aVertical ? f->GetNormalPosition().y : f->GetNormalPosition().x;
+ }
+
+ NS_ENSURE_TRUE(block, aClippedRect);
+
+ nsPresContext* pc = aFrame->PresContext();
+ Float framePosInBlock =
+ Float(pc->AppUnitsToGfxUnits(framePosInBlockAppUnits));
+ int32_t rectPosInBlock = int32_t(NS_round(framePosInBlock + aICoordInFrame));
+ int32_t extraStartEdge =
+ rectPosInBlock - (rectPosInBlock / int32_t(aCycleLength) * aCycleLength);
+ Rect rect(aClippedRect);
+ if (aVertical) {
+ rect.y -= extraStartEdge;
+ rect.height += extraStartEdge;
+ } else {
+ rect.x -= extraStartEdge;
+ rect.width += extraStartEdge;
+ }
+ return rect;
+}
+
+// Converts a GfxFont to an SkFont
+// Either returns true if it was successful, or false if something went wrong
+static bool GetSkFontFromGfxFont(DrawTarget& aDrawTarget, gfxFont* aFont,
+ SkFont& aSkFont) {
+ RefPtr<ScaledFont> scaledFont = aFont->GetScaledFont(&aDrawTarget);
+ if (!scaledFont) {
+ return false;
+ }
+
+ ScaledFontBase* fontBase = static_cast<ScaledFontBase*>(scaledFont.get());
+
+ SkTypeface* typeface = fontBase->GetSkTypeface();
+ if (!typeface) {
+ return false;
+ }
+
+ aSkFont = SkFont(sk_ref_sp(typeface), SkFloatToScalar(fontBase->GetSize()));
+ return true;
+}
+
+// Computes data used to position the decoration line within a
+// SkTextBlob, data is returned through aBounds
+static void GetPositioning(
+ const nsCSSRendering::PaintDecorationLineParams& aParams, const Rect& aRect,
+ Float aOneCSSPixel, Float aCenterBaselineOffset, SkScalar aBounds[]) {
+ /**
+ * How Positioning in Skia Works
+ * Take the letter "n" for example
+ * We set textPos as 0, 0
+ * This is represented in Skia like so (not to scale)
+ * ^
+ * -10px | _ __
+ * | | '_ \
+ * -5px | | | | |
+ * y-axis | |_| |_|
+ * (0,0) ----------------------->
+ * | 5px 10px
+ * 5px |
+ * |
+ * 10px |
+ * v
+ * 0 on the x axis is a line that touches the bottom of the n
+ * (0,0) is the bottom left-hand corner of the n character
+ * Moving "up" from the n is going in a negative y direction
+ * Moving "down" from the n is going in a positive y direction
+ *
+ * The intercepts that are returned in this arrangement will be
+ * offset by the original point it starts at. (This happens in
+ * the SkipInk function below).
+ *
+ * In Skia, text MUST be laid out such that the next character
+ * in the RunBuffer is further along the x-axis than the previous
+ * character, otherwise there is undefined/strange behavior.
+ */
+
+ Float rectThickness = aParams.vertical ? aRect.Width() : aRect.Height();
+
+ // the upper and lower lines/edges of the under or over line
+ SkScalar upperLine, lowerLine;
+ if (aParams.decoration == mozilla::StyleTextDecorationLine::OVERLINE) {
+ lowerLine =
+ -aParams.offset + aParams.defaultLineThickness - aCenterBaselineOffset;
+ upperLine = lowerLine - rectThickness;
+ } else {
+ // underlines in vertical text are offset from the center of
+ // the text, and not the baseline
+ // Skia sets the text at it's baseline so we have to offset it
+ // for text in vertical-* writing modes
+ upperLine = -aParams.offset - aCenterBaselineOffset;
+ lowerLine = upperLine + rectThickness;
+ }
+
+ // set up the bounds, add in a little padding to the thickness of the line
+ // (unless the line is <= 1 CSS pixel thick)
+ Float lineThicknessPadding = aParams.lineSize.height > aOneCSSPixel
+ ? 0.25f * aParams.lineSize.height
+ : 0;
+ // don't allow padding greater than 0.75 CSS pixel
+ lineThicknessPadding = std::min(lineThicknessPadding, 0.75f * aOneCSSPixel);
+ aBounds[0] = upperLine - lineThicknessPadding;
+ aBounds[1] = lowerLine + lineThicknessPadding;
+}
+
+// positions an individual glyph according to the given offset
+static SkPoint GlyphPosition(const gfxTextRun::DetailedGlyph& aGlyph,
+ const SkPoint& aTextPos,
+ int32_t aAppUnitsPerDevPixel) {
+ SkPoint point = {aGlyph.mOffset.x, aGlyph.mOffset.y};
+
+ // convert to device pixels
+ point.fX /= (float)aAppUnitsPerDevPixel;
+ point.fY /= (float)aAppUnitsPerDevPixel;
+
+ // add offsets
+ point.fX += aTextPos.fX;
+ point.fY += aTextPos.fY;
+ return point;
+}
+
+// returns a count of all the glyphs that will be rendered
+// excludes ligature continuations, includes the number of individual
+// glyph records. This includes the number of DetailedGlyphs that a single
+// CompressedGlyph record points to. This function is necessary because Skia
+// needs the total length of glyphs to add to it's run buffer before it creates
+// the RunBuffer object, and this cannot be resized later.
+static uint32_t CountAllGlyphs(
+ const gfxTextRun* aTextRun,
+ const gfxTextRun::CompressedGlyph* aCompressedGlyph, uint32_t aStringStart,
+ uint32_t aStringEnd) {
+ uint32_t totalGlyphCount = 0;
+
+ for (const gfxTextRun::CompressedGlyph* cg = aCompressedGlyph + aStringStart;
+ cg < aCompressedGlyph + aStringEnd; ++cg) {
+ totalGlyphCount += cg->IsSimpleGlyph() ? 1 : cg->GetGlyphCount();
+ }
+
+ return totalGlyphCount;
+}
+
+static void AddDetailedGlyph(const SkTextBlobBuilder::RunBuffer& aRunBuffer,
+ const gfxTextRun::DetailedGlyph& aGlyph,
+ int aIndex, float aAppUnitsPerDevPixel,
+ SkPoint& aTextPos) {
+ // add glyph ID to the run buffer at i
+ aRunBuffer.glyphs[aIndex] = aGlyph.mGlyphID;
+
+ // position the glyph correctly using the detailed offsets
+ SkPoint position = GlyphPosition(aGlyph, aTextPos, aAppUnitsPerDevPixel);
+ aRunBuffer.pos[2 * aIndex] = position.fX;
+ aRunBuffer.pos[(2 * aIndex) + 1] = position.fY;
+
+ // increase aTextPos.fx by the advance
+ aTextPos.fX += ((float)aGlyph.mAdvance / aAppUnitsPerDevPixel);
+}
+
+static void AddSimpleGlyph(const SkTextBlobBuilder::RunBuffer& aRunBuffer,
+ const gfxTextRun::CompressedGlyph& aGlyph,
+ int aIndex, float aAppUnitsPerDevPixel,
+ SkPoint& aTextPos) {
+ aRunBuffer.glyphs[aIndex] = aGlyph.GetSimpleGlyph();
+
+ // simple glyphs are offset from 0, so we'll just use textPos
+ aRunBuffer.pos[2 * aIndex] = aTextPos.fX;
+ aRunBuffer.pos[(2 * aIndex) + 1] = aTextPos.fY;
+
+ // increase aTextPos.fX by the advance
+ aTextPos.fX += ((float)aGlyph.GetSimpleAdvance() / aAppUnitsPerDevPixel);
+}
+
+// Sets up a Skia TextBlob of the specified font, text position, and made up of
+// the glyphs between aStringStart and aStringEnd. Handles RTL and LTR text
+// and positions each glyph within the text blob
+static sk_sp<const SkTextBlob> CreateTextBlob(
+ const gfxTextRun* aTextRun,
+ const gfxTextRun::CompressedGlyph* aCompressedGlyph, const SkFont& aFont,
+ const gfxTextRun::PropertyProvider::Spacing* aSpacing,
+ uint32_t aStringStart, uint32_t aStringEnd, float aAppUnitsPerDevPixel,
+ SkPoint& aTextPos, int32_t& aSpacingOffset) {
+ // allocate space for the run buffer, then fill it with the glyphs
+ uint32_t len =
+ CountAllGlyphs(aTextRun, aCompressedGlyph, aStringStart, aStringEnd);
+ if (len <= 0) {
+ return nullptr;
+ }
+
+ SkTextBlobBuilder builder;
+ const SkTextBlobBuilder::RunBuffer& run = builder.allocRunPos(aFont, len);
+
+ // RTL text should be read in by glyph starting at aStringEnd - 1 down until
+ // aStringStart.
+ bool isRTL = aTextRun->IsRightToLeft();
+ uint32_t currIndex = isRTL ? aStringEnd - 1 : aStringStart; // textRun index
+ // currIndex will be advanced by |step| until it reaches |limit|, which is the
+ // final index to be handled (NOT one beyond the final index)
+ int step = isRTL ? -1 : 1;
+ uint32_t limit = isRTL ? aStringStart : aStringEnd - 1;
+
+ uint32_t i = 0; // index into the SkTextBlob we're building
+ while (true) {
+ // Loop exit test is below, just before we update currIndex.
+ aTextPos.fX +=
+ isRTL ? aSpacing[aSpacingOffset].mAfter / aAppUnitsPerDevPixel
+ : aSpacing[aSpacingOffset].mBefore / aAppUnitsPerDevPixel;
+
+ if (aCompressedGlyph[currIndex].IsSimpleGlyph()) {
+ MOZ_ASSERT(i < len, "glyph count error!");
+ AddSimpleGlyph(run, aCompressedGlyph[currIndex], i, aAppUnitsPerDevPixel,
+ aTextPos);
+ i++;
+ } else {
+ // if it's detailed, potentially add multiple into run.glyphs
+ uint32_t count = aCompressedGlyph[currIndex].GetGlyphCount();
+ if (count > 0) {
+ gfxTextRun::DetailedGlyph* detailGlyph =
+ aTextRun->GetDetailedGlyphs(currIndex);
+ for (uint32_t d = isRTL ? count - 1 : 0; count; count--, d += step) {
+ MOZ_ASSERT(i < len, "glyph count error!");
+ AddDetailedGlyph(run, detailGlyph[d], i, aAppUnitsPerDevPixel,
+ aTextPos);
+ i++;
+ }
+ }
+ }
+ aTextPos.fX += isRTL
+ ? aSpacing[aSpacingOffset].mBefore / aAppUnitsPerDevPixel
+ : aSpacing[aSpacingOffset].mAfter / aAppUnitsPerDevPixel;
+ aSpacingOffset += step;
+
+ if (currIndex == limit) {
+ break;
+ }
+ currIndex += step;
+ }
+
+ MOZ_ASSERT(i == len, "glyph count error!");
+
+ return builder.make();
+}
+
+// Given a TextBlob, the bounding lines, and the set of current intercepts this
+// function adds the intercepts for the current TextBlob into the given set of
+// previoulsy calculated intercepts. This set is either of length 0, or a
+// multiple of 2 (since every intersection with a piece of text results in two
+// intercepts: entering/exiting)
+static void GetTextIntercepts(const sk_sp<const SkTextBlob>& aBlob,
+ const SkScalar aBounds[],
+ nsTArray<SkScalar>& aIntercepts) {
+ // https://skia.org/user/api/SkTextBlob_Reference#Text_Blob_Text_Intercepts
+ int count = aBlob->getIntercepts(aBounds, nullptr);
+ if (count < 2) {
+ return;
+ }
+ aBlob->getIntercepts(aBounds, aIntercepts.AppendElements(count));
+}
+
+// This function, given a set of intercepts that represent each intersection
+// between an under/overline and text, makes a series of calls to
+// PaintDecorationLineInternal that paints a series of clip rects which
+// implement the text-decoration-skip-ink property
+// Logic for where to place each clipped rect, and the length of each rect is
+// included here
+static void SkipInk(nsIFrame* aFrame, DrawTarget& aDrawTarget,
+ const nsCSSRendering::PaintDecorationLineParams& aParams,
+ const nsTArray<SkScalar>& aIntercepts, Float aPadding,
+ Rect& aRect) {
+ nsCSSRendering::PaintDecorationLineParams clipParams = aParams;
+ int length = aIntercepts.Length();
+
+ SkScalar startIntercept = 0;
+ SkScalar endIntercept = 0;
+
+ // keep track of the direction we are drawing the clipped rects in
+ // for sideways text, our intercepts from the first glyph are actually
+ // decreasing (towards the top edge of the page), so we use a negative
+ // direction
+ Float dir = 1.0f;
+ Float lineStart = aParams.vertical ? aParams.pt.y : aParams.pt.x;
+ Float lineEnd = lineStart + aParams.lineSize.width;
+ if (aParams.sidewaysLeft) {
+ dir = -1.0f;
+ std::swap(lineStart, lineEnd);
+ }
+
+ for (int i = 0; i <= length; i += 2) {
+ // handle start/end edge cases and set up general case
+ startIntercept = (i > 0) ? (dir * aIntercepts[i - 1]) + lineStart
+ : lineStart - (dir * aPadding);
+ endIntercept = (i < length) ? (dir * aIntercepts[i]) + lineStart
+ : lineEnd + (dir * aPadding);
+
+ // remove padding at both ends for width
+ // the start of the line is calculated so the padding removes just
+ // enough so that the line starts at its normal position
+ clipParams.lineSize.width =
+ (dir * (endIntercept - startIntercept)) - (2.0 * aPadding);
+
+ // Don't draw decoration lines that have a smaller width than 1, or half
+ // the line-end padding dimension.
+ if (clipParams.lineSize.width < std::max(aPadding * 0.5, 1.0)) {
+ continue;
+ }
+
+ // Start the line right after the intercept's location plus room for
+ // padding; snap the rect edges to device pixels for consistent rendering
+ // of dots across separate fragments of a dotted line.
+ if (aParams.vertical) {
+ clipParams.pt.y = aParams.sidewaysLeft ? endIntercept + aPadding
+ : startIntercept + aPadding;
+ aRect.y = std::floor(clipParams.pt.y + 0.5);
+ aRect.SetBottomEdge(
+ std::floor(clipParams.pt.y + clipParams.lineSize.width + 0.5));
+ } else {
+ clipParams.pt.x = startIntercept + aPadding;
+ aRect.x = std::floor(clipParams.pt.x + 0.5);
+ aRect.SetRightEdge(
+ std::floor(clipParams.pt.x + clipParams.lineSize.width + 0.5));
+ }
+
+ nsCSSRendering::PaintDecorationLineInternal(aFrame, aDrawTarget, clipParams,
+ aRect);
+ }
+}
+
+void nsCSSRendering::PaintDecorationLine(
+ nsIFrame* aFrame, DrawTarget& aDrawTarget,
+ const PaintDecorationLineParams& aParams) {
+ NS_ASSERTION(aParams.style != NS_STYLE_TEXT_DECORATION_STYLE_NONE,
+ "aStyle is none");
+
+ Rect rect = ToRect(GetTextDecorationRectInternal(aParams.pt, aParams));
+ if (rect.IsEmpty() || !rect.Intersects(aParams.dirtyRect)) {
+ return;
+ }
+
+ if (aParams.decoration != StyleTextDecorationLine::UNDERLINE &&
+ aParams.decoration != StyleTextDecorationLine::OVERLINE &&
+ aParams.decoration != StyleTextDecorationLine::LINE_THROUGH) {
+ MOZ_ASSERT_UNREACHABLE("Invalid text decoration value");
+ return;
+ }
+
+ // Check if decoration line will skip past ascenders/descenders
+ // text-decoration-skip-ink only applies to overlines/underlines
+ mozilla::StyleTextDecorationSkipInk skipInk =
+ aFrame->StyleText()->mTextDecorationSkipInk;
+ bool skipInkEnabled =
+ skipInk != mozilla::StyleTextDecorationSkipInk::None &&
+ aParams.decoration != StyleTextDecorationLine::LINE_THROUGH;
+
+ if (!skipInkEnabled || aParams.glyphRange.Length() == 0) {
+ PaintDecorationLineInternal(aFrame, aDrawTarget, aParams, rect);
+ return;
+ }
+
+ // check if the frame is a text frame or not
+ nsTextFrame* textFrame = nullptr;
+ if (aFrame->IsTextFrame()) {
+ textFrame = static_cast<nsTextFrame*>(aFrame);
+ } else {
+ PaintDecorationLineInternal(aFrame, aDrawTarget, aParams, rect);
+ return;
+ }
+
+ // get text run and current text offset (for line wrapping)
+ gfxTextRun* textRun =
+ textFrame->GetTextRun(nsTextFrame::TextRunType::eInflated);
+
+ // used for conversions from app units to device pixels
+ int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
+
+ // pointer to the array of glyphs for this TextRun
+ gfxTextRun::CompressedGlyph* characterGlyphs = textRun->GetCharacterGlyphs();
+
+ // get positioning info
+ SkPoint textPos = {0, aParams.baselineOffset};
+ SkScalar bounds[] = {0, 0};
+ Float oneCSSPixel = aFrame->PresContext()->CSSPixelsToDevPixels(1.0f);
+ if (!textRun->UseCenterBaseline()) {
+ GetPositioning(aParams, rect, oneCSSPixel, 0, bounds);
+ }
+
+ // array for the text intercepts
+ AutoTArray<SkScalar, 256> intercepts;
+
+ // array for spacing data
+ AutoTArray<gfxTextRun::PropertyProvider::Spacing, 64> spacing;
+ spacing.SetLength(aParams.glyphRange.Length());
+ if (aParams.provider != nullptr) {
+ aParams.provider->GetSpacing(aParams.glyphRange, spacing.Elements());
+ }
+
+ // loop through each glyph run
+ // in most cases there will only be one
+ bool isRTL = textRun->IsRightToLeft();
+ int32_t spacingOffset = isRTL ? aParams.glyphRange.Length() - 1 : 0;
+ gfxTextRun::GlyphRunIterator iter(textRun, aParams.glyphRange, isRTL);
+
+ // For any glyph run where we don't actually do skipping, we'll need to
+ // advance the current position by its width.
+ // (For runs we do process, CreateTextBlob will update the position.)
+ auto currentGlyphRunAdvance = [&]() {
+ return textRun->GetAdvanceWidth(
+ gfxTextRun::Range(iter.GetStringStart(), iter.GetStringEnd()),
+ aParams.provider) /
+ appUnitsPerDevPixel;
+ };
+
+ while (iter.NextRun()) {
+ if (iter.GetGlyphRun()->mOrientation ==
+ mozilla::gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT ||
+ (iter.GetGlyphRun()->mIsCJK &&
+ skipInk == mozilla::StyleTextDecorationSkipInk::Auto)) {
+ // We don't support upright text in vertical modes currently
+ // (see https://bugzilla.mozilla.org/show_bug.cgi?id=1572294),
+ // but we do need to update textPos so that following runs will be
+ // correctly positioned.
+ // We also don't apply skip-ink to CJK text runs because many fonts
+ // have an underline that looks really bad if this is done
+ // (see https://bugzilla.mozilla.org/show_bug.cgi?id=1573249),
+ // when skip-ink is set to 'auto'.
+ textPos.fX += currentGlyphRunAdvance();
+ continue;
+ }
+
+ gfxFont* font = iter.GetGlyphRun()->mFont;
+ // Don't try to apply skip-ink to 'sbix' fonts like Apple Color Emoji,
+ // because old macOS (10.9) may crash trying to retrieve glyph paths
+ // that don't exist.
+ if (font->GetFontEntry()->HasFontTable(TRUETYPE_TAG('s', 'b', 'i', 'x'))) {
+ textPos.fX += currentGlyphRunAdvance();
+ continue;
+ }
+
+ // get a Skia version of the glyph run's font
+ SkFont skiafont;
+ if (!GetSkFontFromGfxFont(aDrawTarget, font, skiafont)) {
+ PaintDecorationLineInternal(aFrame, aDrawTarget, aParams, rect);
+ return;
+ }
+
+ // Create a text blob with correctly positioned glyphs. This also updates
+ // textPos.fX with the advance of the glyphs.
+ sk_sp<const SkTextBlob> textBlob =
+ CreateTextBlob(textRun, characterGlyphs, skiafont, spacing.Elements(),
+ iter.GetStringStart(), iter.GetStringEnd(),
+ (float)appUnitsPerDevPixel, textPos, spacingOffset);
+
+ if (!textBlob) {
+ textPos.fX += currentGlyphRunAdvance();
+ continue;
+ }
+
+ if (textRun->UseCenterBaseline()) {
+ // writing modes that use a center baseline need to be adjusted on a
+ // font-by-font basis since Skia lines up the text on a alphabetic
+ // baseline, but for some vertical-* writing modes the offset is from the
+ // center.
+ gfxFont::Metrics metrics = font->GetMetrics(nsFontMetrics::eHorizontal);
+ Float centerToBaseline = (metrics.emAscent - metrics.emDescent) / 2.0f;
+ GetPositioning(aParams, rect, oneCSSPixel, centerToBaseline, bounds);
+ }
+
+ // compute the text intercepts that need to be skipped
+ GetTextIntercepts(textBlob, bounds, intercepts);
+ }
+ bool needsSkipInk = intercepts.Length() > 0;
+
+ if (needsSkipInk) {
+ // Padding between glyph intercepts and the decoration line: we use the
+ // decoration line thickness, clamped to a minimum of 1px and a maximum
+ // of 0.2em.
+ Float padding =
+ std::min(std::max(aParams.lineSize.height, oneCSSPixel),
+ Float(textRun->GetFontGroup()->GetStyle()->size / 5.0));
+ SkipInk(aFrame, aDrawTarget, aParams, intercepts, padding, rect);
+ } else {
+ PaintDecorationLineInternal(aFrame, aDrawTarget, aParams, rect);
+ }
+}
+
+void nsCSSRendering::PaintDecorationLineInternal(
+ nsIFrame* aFrame, DrawTarget& aDrawTarget,
+ const PaintDecorationLineParams& aParams, Rect aRect) {
+ Float lineThickness = std::max(NS_round(aParams.lineSize.height), 1.0);
+
+ DeviceColor color = ToDeviceColor(aParams.color);
+ ColorPattern colorPat(color);
+ StrokeOptions strokeOptions(lineThickness);
+ DrawOptions drawOptions;
+
+ Float dash[2];
+
+ AutoPopClips autoPopClips(&aDrawTarget);
+
+ mozilla::layout::TextDrawTarget* textDrawer = nullptr;
+ if (aDrawTarget.GetBackendType() == BackendType::WEBRENDER_TEXT) {
+ textDrawer = static_cast<mozilla::layout::TextDrawTarget*>(&aDrawTarget);
+ }
+
+ switch (aParams.style) {
+ case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
+ case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE:
+ break;
+ case NS_STYLE_TEXT_DECORATION_STYLE_DASHED: {
+ autoPopClips.PushClipRect(aRect);
+ Float dashWidth = lineThickness * DOT_LENGTH * DASH_LENGTH;
+ dash[0] = dashWidth;
+ dash[1] = dashWidth;
+ strokeOptions.mDashPattern = dash;
+ strokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
+ strokeOptions.mLineCap = CapStyle::BUTT;
+ aRect = ExpandPaintingRectForDecorationLine(
+ aFrame, aParams.style, aRect, aParams.icoordInFrame, dashWidth * 2,
+ aParams.vertical);
+ // We should continue to draw the last dash even if it is not in the rect.
+ aRect.width += dashWidth;
+ break;
+ }
+ case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED: {
+ autoPopClips.PushClipRect(aRect);
+ Float dashWidth = lineThickness * DOT_LENGTH;
+ if (lineThickness > 2.0) {
+ dash[0] = 0.f;
+ dash[1] = dashWidth * 2.f;
+ strokeOptions.mLineCap = CapStyle::ROUND;
+ } else {
+ dash[0] = dashWidth;
+ dash[1] = dashWidth;
+ }
+ strokeOptions.mDashPattern = dash;
+ strokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
+ aRect = ExpandPaintingRectForDecorationLine(
+ aFrame, aParams.style, aRect, aParams.icoordInFrame, dashWidth * 2,
+ aParams.vertical);
+ // We should continue to draw the last dot even if it is not in the rect.
+ aRect.width += dashWidth;
+ break;
+ }
+ case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
+ autoPopClips.PushClipRect(aRect);
+ if (lineThickness > 2.0) {
+ drawOptions.mAntialiasMode = AntialiasMode::SUBPIXEL;
+ } else {
+ // Don't use anti-aliasing here. Because looks like lighter color wavy
+ // line at this case. And probably, users don't think the
+ // non-anti-aliased wavy line is not pretty.
+ drawOptions.mAntialiasMode = AntialiasMode::NONE;
+ }
+ break;
+ default:
+ NS_ERROR("Invalid style value!");
+ return;
+ }
+
+ // The block-direction position should be set to the middle of the line.
+ if (aParams.vertical) {
+ aRect.x += lineThickness / 2;
+ } else {
+ aRect.y += lineThickness / 2;
+ }
+
+ switch (aParams.style) {
+ case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
+ case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
+ case NS_STYLE_TEXT_DECORATION_STYLE_DASHED: {
+ Point p1 = aRect.TopLeft();
+ Point p2 = aParams.vertical ? aRect.BottomLeft() : aRect.TopRight();
+ if (textDrawer) {
+ textDrawer->AppendDecoration(p1, p2, lineThickness, aParams.vertical,
+ color, aParams.style);
+ } else {
+ aDrawTarget.StrokeLine(p1, p2, colorPat, strokeOptions, drawOptions);
+ }
+ return;
+ }
+ case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE: {
+ /**
+ * We are drawing double line as:
+ *
+ * +-------------------------------------------+
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
+ * | |
+ * | |
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
+ * +-------------------------------------------+
+ */
+ Point p1a = aRect.TopLeft();
+ Point p2a = aParams.vertical ? aRect.BottomLeft() : aRect.TopRight();
+
+ if (aParams.vertical) {
+ aRect.width -= lineThickness;
+ } else {
+ aRect.height -= lineThickness;
+ }
+
+ Point p1b = aParams.vertical ? aRect.TopRight() : aRect.BottomLeft();
+ Point p2b = aRect.BottomRight();
+
+ if (textDrawer) {
+ textDrawer->AppendDecoration(p1a, p2a, lineThickness, aParams.vertical,
+ color,
+ NS_STYLE_TEXT_DECORATION_STYLE_SOLID);
+ textDrawer->AppendDecoration(p1b, p2b, lineThickness, aParams.vertical,
+ color,
+ NS_STYLE_TEXT_DECORATION_STYLE_SOLID);
+ } else {
+ aDrawTarget.StrokeLine(p1a, p2a, colorPat, strokeOptions, drawOptions);
+ aDrawTarget.StrokeLine(p1b, p2b, colorPat, strokeOptions, drawOptions);
+ }
+ return;
+ }
+ case NS_STYLE_TEXT_DECORATION_STYLE_WAVY: {
+ /**
+ * We are drawing wavy line as:
+ *
+ * P: Path, X: Painted pixel
+ *
+ * +---------------------------------------+
+ * XX|X XXXXXX XXXXXX |
+ * PP|PX XPPPPPPX XPPPPPPX | ^
+ * XX|XPX XPXXXXXXPX XPXXXXXXPX| |
+ * | XPX XPX XPX XPX XP|X |adv
+ * | XPXXXXXXPX XPXXXXXXPX X|PX |
+ * | XPPPPPPX XPPPPPPX |XPX v
+ * | XXXXXX XXXXXX | XX
+ * +---------------------------------------+
+ * <---><---> ^
+ * adv flatLengthAtVertex rightMost
+ *
+ * 1. Always starts from top-left of the drawing area, however, we need
+ * to draw the line from outside of the rect. Because the start
+ * point of the line is not good style if we draw from inside it.
+ * 2. First, draw horizontal line from outside the rect to top-left of
+ * the rect;
+ * 3. Goes down to bottom of the area at 45 degrees.
+ * 4. Slides to right horizontaly, see |flatLengthAtVertex|.
+ * 5. Goes up to top of the area at 45 degrees.
+ * 6. Slides to right horizontaly.
+ * 7. Repeat from 2 until reached to right-most edge of the area.
+ *
+ * In the vertical case, swap horizontal and vertical coordinates and
+ * directions in the above description.
+ */
+
+ Float& rectICoord = aParams.vertical ? aRect.y : aRect.x;
+ Float& rectISize = aParams.vertical ? aRect.height : aRect.width;
+ const Float rectBSize = aParams.vertical ? aRect.width : aRect.height;
+
+ const Float adv = rectBSize - lineThickness;
+ const Float flatLengthAtVertex =
+ std::max((lineThickness - 1.0) * 2.0, 1.0);
+
+ // Align the start of wavy lines to the nearest ancestor block.
+ const Float cycleLength = 2 * (adv + flatLengthAtVertex);
+ aRect = ExpandPaintingRectForDecorationLine(
+ aFrame, aParams.style, aRect, aParams.icoordInFrame, cycleLength,
+ aParams.vertical);
+
+ if (textDrawer) {
+ // Undo attempted centering
+ Float& rectBCoord = aParams.vertical ? aRect.x : aRect.y;
+ rectBCoord -= lineThickness / 2;
+
+ textDrawer->AppendWavyDecoration(aRect, lineThickness, aParams.vertical,
+ color);
+ return;
+ }
+
+ // figure out if we can trim whole cycles from the left and right edges
+ // of the line, to try and avoid creating an unnecessarily long and
+ // complex path (but don't do this for webrender, )
+ const Float dirtyRectICoord =
+ aParams.vertical ? aParams.dirtyRect.y : aParams.dirtyRect.x;
+ int32_t skipCycles = floor((dirtyRectICoord - rectICoord) / cycleLength);
+ if (skipCycles > 0) {
+ rectICoord += skipCycles * cycleLength;
+ rectISize -= skipCycles * cycleLength;
+ }
+
+ rectICoord += lineThickness / 2.0;
+
+ Point pt(aRect.TopLeft());
+ Float& ptICoord = aParams.vertical ? pt.y : pt.x;
+ Float& ptBCoord = aParams.vertical ? pt.x : pt.y;
+ if (aParams.vertical) {
+ ptBCoord += adv;
+ }
+ Float iCoordLimit = ptICoord + rectISize + lineThickness;
+
+ const Float dirtyRectIMost = aParams.vertical ? aParams.dirtyRect.YMost()
+ : aParams.dirtyRect.XMost();
+ skipCycles = floor((iCoordLimit - dirtyRectIMost) / cycleLength);
+ if (skipCycles > 0) {
+ iCoordLimit -= skipCycles * cycleLength;
+ }
+
+ RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+ RefPtr<Path> path;
+
+ ptICoord -= lineThickness;
+ builder->MoveTo(pt); // 1
+
+ ptICoord = rectICoord;
+ builder->LineTo(pt); // 2
+
+ // In vertical mode, to go "down" relative to the text we need to
+ // decrease the block coordinate, whereas in horizontal we increase
+ // it. So the sense of this flag is effectively inverted.
+ bool goDown = !aParams.vertical;
+ uint32_t iter = 0;
+ while (ptICoord < iCoordLimit) {
+ if (++iter > 1000) {
+ // stroke the current path and start again, to avoid pathological
+ // behavior in cairo with huge numbers of path segments
+ path = builder->Finish();
+ aDrawTarget.Stroke(path, colorPat, strokeOptions, drawOptions);
+ builder = aDrawTarget.CreatePathBuilder();
+ builder->MoveTo(pt);
+ iter = 0;
+ }
+ ptICoord += adv;
+ ptBCoord += goDown ? adv : -adv;
+
+ builder->LineTo(pt); // 3 and 5
+
+ ptICoord += flatLengthAtVertex;
+ builder->LineTo(pt); // 4 and 6
+
+ goDown = !goDown;
+ }
+ path = builder->Finish();
+ aDrawTarget.Stroke(path, colorPat, strokeOptions, drawOptions);
+ return;
+ }
+ default:
+ NS_ERROR("Invalid style value!");
+ }
+}
+
+Rect nsCSSRendering::DecorationLineToPath(
+ const PaintDecorationLineParams& aParams) {
+ NS_ASSERTION(aParams.style != NS_STYLE_TEXT_DECORATION_STYLE_NONE,
+ "aStyle is none");
+
+ Rect path; // To benefit from RVO, we return this from all return points
+
+ Rect rect = ToRect(GetTextDecorationRectInternal(aParams.pt, aParams));
+ if (rect.IsEmpty() || !rect.Intersects(aParams.dirtyRect)) {
+ return path;
+ }
+
+ if (aParams.decoration != StyleTextDecorationLine::UNDERLINE &&
+ aParams.decoration != StyleTextDecorationLine::OVERLINE &&
+ aParams.decoration != StyleTextDecorationLine::LINE_THROUGH) {
+ MOZ_ASSERT_UNREACHABLE("Invalid text decoration value");
+ return path;
+ }
+
+ if (aParams.style != NS_STYLE_TEXT_DECORATION_STYLE_SOLID) {
+ // For the moment, we support only solid text decorations.
+ return path;
+ }
+
+ Float lineThickness = std::max(NS_round(aParams.lineSize.height), 1.0);
+
+ // The block-direction position should be set to the middle of the line.
+ if (aParams.vertical) {
+ rect.x += lineThickness / 2;
+ path = Rect(rect.TopLeft() - Point(lineThickness / 2, 0.0),
+ Size(lineThickness, rect.Height()));
+ } else {
+ rect.y += lineThickness / 2;
+ path = Rect(rect.TopLeft() - Point(0.0, lineThickness / 2),
+ Size(rect.Width(), lineThickness));
+ }
+
+ return path;
+}
+
+nsRect nsCSSRendering::GetTextDecorationRect(
+ nsPresContext* aPresContext, const DecorationRectParams& aParams) {
+ NS_ASSERTION(aPresContext, "aPresContext is null");
+ NS_ASSERTION(aParams.style != NS_STYLE_TEXT_DECORATION_STYLE_NONE,
+ "aStyle is none");
+
+ gfxRect rect = GetTextDecorationRectInternal(Point(0, 0), aParams);
+ // The rect values are already rounded to nearest device pixels.
+ nsRect r;
+ r.x = aPresContext->GfxUnitsToAppUnits(rect.X());
+ r.y = aPresContext->GfxUnitsToAppUnits(rect.Y());
+ r.width = aPresContext->GfxUnitsToAppUnits(rect.Width());
+ r.height = aPresContext->GfxUnitsToAppUnits(rect.Height());
+ return r;
+}
+
+gfxRect nsCSSRendering::GetTextDecorationRectInternal(
+ const Point& aPt, const DecorationRectParams& aParams) {
+ NS_ASSERTION(aParams.style <= NS_STYLE_TEXT_DECORATION_STYLE_WAVY,
+ "Invalid aStyle value");
+
+ if (aParams.style == NS_STYLE_TEXT_DECORATION_STYLE_NONE)
+ return gfxRect(0, 0, 0, 0);
+
+ bool canLiftUnderline = aParams.descentLimit >= 0.0;
+
+ gfxFloat iCoord = aParams.vertical ? aPt.y : aPt.x;
+ gfxFloat bCoord = aParams.vertical ? aPt.x : aPt.y;
+
+ // 'left' and 'right' are relative to the line, so for vertical writing modes
+ // they will actually become top and bottom of the rendered line.
+ // Similarly, aLineSize.width and .height are actually length and thickness
+ // of the line, which runs horizontally or vertically according to aVertical.
+ const gfxFloat left = floor(iCoord + 0.5),
+ right = floor(iCoord + aParams.lineSize.width + 0.5);
+
+ // We compute |r| as if for a horizontal text run, and then swap vertical
+ // and horizontal coordinates at the end if vertical was requested.
+ gfxRect r(left, 0, right - left, 0);
+
+ gfxFloat lineThickness = NS_round(aParams.lineSize.height);
+ lineThickness = std::max(lineThickness, 1.0);
+ gfxFloat defaultLineThickness = NS_round(aParams.defaultLineThickness);
+ defaultLineThickness = std::max(defaultLineThickness, 1.0);
+
+ gfxFloat ascent = NS_round(aParams.ascent);
+ gfxFloat descentLimit = floor(aParams.descentLimit);
+
+ gfxFloat suggestedMaxRectHeight =
+ std::max(std::min(ascent, descentLimit), 1.0);
+ r.height = lineThickness;
+ if (aParams.style == NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE) {
+ /**
+ * We will draw double line as:
+ *
+ * +-------------------------------------------+
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
+ * | | ^
+ * | | | gap
+ * | | v
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
+ * |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
+ * +-------------------------------------------+
+ */
+ gfxFloat gap = NS_round(lineThickness / 2.0);
+ gap = std::max(gap, 1.0);
+ r.height = lineThickness * 2.0 + gap;
+ if (canLiftUnderline) {
+ if (r.Height() > suggestedMaxRectHeight) {
+ // Don't shrink the line height, because the thickness has some meaning.
+ // We can just shrink the gap at this time.
+ r.height = std::max(suggestedMaxRectHeight, lineThickness * 2.0 + 1.0);
+ }
+ }
+ } else if (aParams.style == NS_STYLE_TEXT_DECORATION_STYLE_WAVY) {
+ /**
+ * We will draw wavy line as:
+ *
+ * +-------------------------------------------+
+ * |XXXXX XXXXXX XXXXXX | ^
+ * |XXXXXX XXXXXXXX XXXXXXXX | | lineThickness
+ * |XXXXXXX XXXXXXXXXX XXXXXXXXXX| v
+ * | XXX XXX XXX XXX XX|
+ * | XXXXXXXXXX XXXXXXXXXX X|
+ * | XXXXXXXX XXXXXXXX |
+ * | XXXXXX XXXXXX |
+ * +-------------------------------------------+
+ */
+ r.height = lineThickness > 2.0 ? lineThickness * 4.0 : lineThickness * 3.0;
+ if (canLiftUnderline) {
+ if (r.Height() > suggestedMaxRectHeight) {
+ // Don't shrink the line height even if there is not enough space,
+ // because the thickness has some meaning. E.g., the 1px wavy line and
+ // 2px wavy line can be used for different meaning in IME selections
+ // at same time.
+ r.height = std::max(suggestedMaxRectHeight, lineThickness * 2.0);
+ }
+ }
+ }
+
+ gfxFloat baseline = floor(bCoord + aParams.ascent + 0.5);
+
+ // Calculate adjusted offset based on writing-mode/orientation and thickness
+ // of decoration line. The input value aParams.offset is the nominal position
+ // (offset from baseline) where we would draw a single, infinitely-thin line;
+ // but for a wavy or double line, we'll need to move the bounding rect of the
+ // decoration outwards from the baseline so that an underline remains below
+ // the glyphs, and an overline above them, despite the increased block-dir
+ // extent of the decoration.
+ //
+ // So adjustments by r.Height() are used to make the wider line styles (wavy
+ // and double) "grow" in the appropriate direction compared to the basic
+ // single line.
+ //
+ // Note that at this point, the decoration rect is being calculated in line-
+ // relative coordinates, where 'x' is line-rightwards, and 'y' is line-
+ // upwards. We'll swap them to be physical coords at the end.
+ gfxFloat offset = 0.0;
+
+ if (aParams.decoration == StyleTextDecorationLine::UNDERLINE) {
+ offset = aParams.offset;
+ if (canLiftUnderline) {
+ if (descentLimit < -offset + r.Height()) {
+ // If we can ignore the offset and the decoration line is overflowing,
+ // we should align the bottom edge of the decoration line rect if it's
+ // possible. Otherwise, we should lift up the top edge of the rect as
+ // far as possible.
+ gfxFloat offsetBottomAligned = -descentLimit + r.Height();
+ gfxFloat offsetTopAligned = 0.0;
+ offset = std::min(offsetBottomAligned, offsetTopAligned);
+ }
+ }
+ } else if (aParams.decoration == StyleTextDecorationLine::OVERLINE) {
+ // For overline, we adjust the offset by defaultlineThickness (the default
+ // thickness of a single decoration line) because empirically it looks
+ // better to draw the overline just inside rather than outside the font's
+ // ascent, which is what nsTextFrame passes as aParams.offset (as fonts
+ // don't provide an explicit overline-offset).
+ offset = aParams.offset - defaultLineThickness + r.Height();
+ } else if (aParams.decoration == StyleTextDecorationLine::LINE_THROUGH) {
+ // To maintain a consistent mid-point for line-through decorations,
+ // we adjust the offset by half of the decoration rect's height.
+ gfxFloat extra = floor(r.Height() / 2.0 + 0.5);
+ extra = std::max(extra, lineThickness);
+ // computes offset for when user specifies a decoration width since
+ // aParams.offset is derived from the font metric's line height
+ gfxFloat decorationThicknessOffset =
+ (lineThickness - defaultLineThickness) / 2.0;
+ offset = aParams.offset - lineThickness + extra + decorationThicknessOffset;
+ } else {
+ MOZ_ASSERT_UNREACHABLE("Invalid text decoration value");
+ }
+
+ // Convert line-relative coordinate system (x = line-right, y = line-up)
+ // to physical coords, and move the decoration rect to the calculated
+ // offset from baseline.
+ if (aParams.vertical) {
+ std::swap(r.x, r.y);
+ std::swap(r.width, r.height);
+ // line-upwards in vertical mode = physical-right, so we /add/ offset
+ // to baseline. Except in sideways-lr mode, where line-upwards will be
+ // physical leftwards.
+ if (aParams.sidewaysLeft) {
+ r.x = baseline - floor(offset + 0.5);
+ } else {
+ r.x = baseline + floor(offset - r.Width() + 0.5);
+ }
+ } else {
+ // line-upwards in horizontal mode = physical-up, but our physical coord
+ // system works downwards, so we /subtract/ offset from baseline.
+ r.y = baseline - floor(offset + 0.5);
+ }
+
+ return r;
+}
+
+#define MAX_BLUR_RADIUS 300
+#define MAX_SPREAD_RADIUS 50
+
+static inline gfxPoint ComputeBlurStdDev(nscoord aBlurRadius,
+ int32_t aAppUnitsPerDevPixel,
+ gfxFloat aScaleX, gfxFloat aScaleY) {
+ // http://dev.w3.org/csswg/css3-background/#box-shadow says that the
+ // standard deviation of the blur should be half the given blur value.
+ gfxFloat blurStdDev = gfxFloat(aBlurRadius) / gfxFloat(aAppUnitsPerDevPixel);
+
+ return gfxPoint(
+ std::min((blurStdDev * aScaleX), gfxFloat(MAX_BLUR_RADIUS)) / 2.0,
+ std::min((blurStdDev * aScaleY), gfxFloat(MAX_BLUR_RADIUS)) / 2.0);
+}
+
+static inline IntSize ComputeBlurRadius(nscoord aBlurRadius,
+ int32_t aAppUnitsPerDevPixel,
+ gfxFloat aScaleX = 1.0,
+ gfxFloat aScaleY = 1.0) {
+ gfxPoint scaledBlurStdDev =
+ ComputeBlurStdDev(aBlurRadius, aAppUnitsPerDevPixel, aScaleX, aScaleY);
+ return gfxAlphaBoxBlur::CalculateBlurRadius(scaledBlurStdDev);
+}
+
+// -----
+// nsContextBoxBlur
+// -----
+gfxContext* nsContextBoxBlur::Init(const nsRect& aRect, nscoord aSpreadRadius,
+ nscoord aBlurRadius,
+ int32_t aAppUnitsPerDevPixel,
+ gfxContext* aDestinationCtx,
+ const nsRect& aDirtyRect,
+ const gfxRect* aSkipRect, uint32_t aFlags) {
+ if (aRect.IsEmpty()) {
+ mContext = nullptr;
+ return nullptr;
+ }
+
+ IntSize blurRadius;
+ IntSize spreadRadius;
+ GetBlurAndSpreadRadius(aDestinationCtx->GetDrawTarget(), aAppUnitsPerDevPixel,
+ aBlurRadius, aSpreadRadius, blurRadius, spreadRadius);
+
+ mDestinationCtx = aDestinationCtx;
+
+ // If not blurring, draw directly onto the destination device
+ if (blurRadius.width <= 0 && blurRadius.height <= 0 &&
+ spreadRadius.width <= 0 && spreadRadius.height <= 0 &&
+ !(aFlags & FORCE_MASK)) {
+ mContext = aDestinationCtx;
+ return mContext;
+ }
+
+ // Convert from app units to device pixels
+ gfxRect rect = nsLayoutUtils::RectToGfxRect(aRect, aAppUnitsPerDevPixel);
+
+ gfxRect dirtyRect =
+ nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
+ dirtyRect.RoundOut();
+
+ gfxMatrix transform = aDestinationCtx->CurrentMatrixDouble();
+ rect = transform.TransformBounds(rect);
+
+ mPreTransformed = !transform.IsIdentity();
+
+ // Create the temporary surface for blurring
+ dirtyRect = transform.TransformBounds(dirtyRect);
+ bool useHardwareAccel = !(aFlags & DISABLE_HARDWARE_ACCELERATION_BLUR);
+ if (aSkipRect) {
+ gfxRect skipRect = transform.TransformBounds(*aSkipRect);
+ mContext =
+ mAlphaBoxBlur.Init(aDestinationCtx, rect, spreadRadius, blurRadius,
+ &dirtyRect, &skipRect, useHardwareAccel);
+ } else {
+ mContext =
+ mAlphaBoxBlur.Init(aDestinationCtx, rect, spreadRadius, blurRadius,
+ &dirtyRect, nullptr, useHardwareAccel);
+ }
+
+ if (mContext) {
+ // we don't need to blur if skipRect is equal to rect
+ // and mContext will be nullptr
+ mContext->Multiply(transform);
+ }
+ return mContext;
+}
+
+void nsContextBoxBlur::DoPaint() {
+ if (mContext == mDestinationCtx) {
+ return;
+ }
+
+ gfxContextMatrixAutoSaveRestore saveMatrix(mDestinationCtx);
+
+ if (mPreTransformed) {
+ mDestinationCtx->SetMatrix(Matrix());
+ }
+
+ mAlphaBoxBlur.Paint(mDestinationCtx);
+}
+
+gfxContext* nsContextBoxBlur::GetContext() { return mContext; }
+
+/* static */
+nsMargin nsContextBoxBlur::GetBlurRadiusMargin(nscoord aBlurRadius,
+ int32_t aAppUnitsPerDevPixel) {
+ IntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel);
+
+ nsMargin result;
+ result.top = result.bottom = blurRadius.height * aAppUnitsPerDevPixel;
+ result.left = result.right = blurRadius.width * aAppUnitsPerDevPixel;
+ return result;
+}
+
+/* static */
+void nsContextBoxBlur::BlurRectangle(
+ gfxContext* aDestinationCtx, const nsRect& aRect,
+ int32_t aAppUnitsPerDevPixel, RectCornerRadii* aCornerRadii,
+ nscoord aBlurRadius, const sRGBColor& aShadowColor,
+ const nsRect& aDirtyRect, const gfxRect& aSkipRect) {
+ DrawTarget& aDestDrawTarget = *aDestinationCtx->GetDrawTarget();
+
+ if (aRect.IsEmpty()) {
+ return;
+ }
+
+ Rect shadowGfxRect = NSRectToRect(aRect, aAppUnitsPerDevPixel);
+
+ if (aBlurRadius <= 0) {
+ ColorPattern color(ToDeviceColor(aShadowColor));
+ if (aCornerRadii) {
+ RefPtr<Path> roundedRect =
+ MakePathForRoundedRect(aDestDrawTarget, shadowGfxRect, *aCornerRadii);
+ aDestDrawTarget.Fill(roundedRect, color);
+ } else {
+ aDestDrawTarget.FillRect(shadowGfxRect, color);
+ }
+ return;
+ }
+
+ gfxFloat scaleX = 1;
+ gfxFloat scaleY = 1;
+
+ // Do blurs in device space when possible.
+ // Chrome/Skia always does the blurs in device space
+ // and will sometimes get incorrect results (e.g. rotated blurs)
+ gfxMatrix transform = aDestinationCtx->CurrentMatrixDouble();
+ // XXX: we could probably handle negative scales but for now it's easier just
+ // to fallback
+ if (!transform.HasNonAxisAlignedTransform() && transform._11 > 0.0 &&
+ transform._22 > 0.0) {
+ scaleX = transform._11;
+ scaleY = transform._22;
+ aDestinationCtx->SetMatrix(Matrix());
+ } else {
+ transform = gfxMatrix();
+ }
+
+ gfxPoint blurStdDev =
+ ComputeBlurStdDev(aBlurRadius, aAppUnitsPerDevPixel, scaleX, scaleY);
+
+ gfxRect dirtyRect =
+ nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
+ dirtyRect.RoundOut();
+
+ gfxRect shadowThebesRect =
+ transform.TransformBounds(ThebesRect(shadowGfxRect));
+ dirtyRect = transform.TransformBounds(dirtyRect);
+ gfxRect skipRect = transform.TransformBounds(aSkipRect);
+
+ if (aCornerRadii) {
+ aCornerRadii->Scale(scaleX, scaleY);
+ }
+
+ gfxAlphaBoxBlur::BlurRectangle(aDestinationCtx, shadowThebesRect,
+ aCornerRadii, blurStdDev, aShadowColor,
+ dirtyRect, skipRect);
+}
+
+/* static */
+void nsContextBoxBlur::GetBlurAndSpreadRadius(
+ DrawTarget* aDestDrawTarget, int32_t aAppUnitsPerDevPixel,
+ nscoord aBlurRadius, nscoord aSpreadRadius, IntSize& aOutBlurRadius,
+ IntSize& aOutSpreadRadius, bool aConstrainSpreadRadius) {
+ // Do blurs in device space when possible.
+ // Chrome/Skia always does the blurs in device space
+ // and will sometimes get incorrect results (e.g. rotated blurs)
+ Matrix transform = aDestDrawTarget->GetTransform();
+ // XXX: we could probably handle negative scales but for now it's easier just
+ // to fallback
+ gfxFloat scaleX, scaleY;
+ if (transform.HasNonAxisAlignedTransform() || transform._11 <= 0.0 ||
+ transform._22 <= 0.0) {
+ scaleX = 1;
+ scaleY = 1;
+ } else {
+ scaleX = transform._11;
+ scaleY = transform._22;
+ }
+
+ // compute a large or smaller blur radius
+ aOutBlurRadius =
+ ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel, scaleX, scaleY);
+ aOutSpreadRadius =
+ IntSize(int32_t(aSpreadRadius * scaleX / aAppUnitsPerDevPixel),
+ int32_t(aSpreadRadius * scaleY / aAppUnitsPerDevPixel));
+
+ if (aConstrainSpreadRadius) {
+ aOutSpreadRadius.width =
+ std::min(aOutSpreadRadius.width, int32_t(MAX_SPREAD_RADIUS));
+ aOutSpreadRadius.height =
+ std::min(aOutSpreadRadius.height, int32_t(MAX_SPREAD_RADIUS));
+ }
+}
+
+/* static */
+bool nsContextBoxBlur::InsetBoxBlur(
+ gfxContext* aDestinationCtx, Rect aDestinationRect, Rect aShadowClipRect,
+ sRGBColor& aShadowColor, nscoord aBlurRadiusAppUnits,
+ nscoord aSpreadDistanceAppUnits, int32_t aAppUnitsPerDevPixel,
+ bool aHasBorderRadius, RectCornerRadii& aInnerClipRectRadii, Rect aSkipRect,
+ Point aShadowOffset) {
+ if (aDestinationRect.IsEmpty()) {
+ mContext = nullptr;
+ return false;
+ }
+
+ gfxContextAutoSaveRestore autoRestore(aDestinationCtx);
+
+ IntSize blurRadius;
+ IntSize spreadRadius;
+ // Convert the blur and spread radius to device pixels
+ bool constrainSpreadRadius = false;
+ GetBlurAndSpreadRadius(aDestinationCtx->GetDrawTarget(), aAppUnitsPerDevPixel,
+ aBlurRadiusAppUnits, aSpreadDistanceAppUnits,
+ blurRadius, spreadRadius, constrainSpreadRadius);
+
+ // The blur and spread radius are scaled already, so scale all
+ // input data to the blur. This way, we don't have to scale the min
+ // inset blur to the invert of the dest context, then rescale it back
+ // when we draw to the destination surface.
+ gfx::Size scale = aDestinationCtx->CurrentMatrix().ScaleFactors();
+ Matrix transform = aDestinationCtx->CurrentMatrix();
+
+ // XXX: we could probably handle negative scales but for now it's easier just
+ // to fallback
+ if (!transform.HasNonAxisAlignedTransform() && transform._11 > 0.0 &&
+ transform._22 > 0.0) {
+ // If we don't have a rotation, we're pre-transforming all the rects.
+ aDestinationCtx->SetMatrix(Matrix());
+ } else {
+ // Don't touch anything, we have a rotation.
+ transform = Matrix();
+ }
+
+ Rect transformedDestRect = transform.TransformBounds(aDestinationRect);
+ Rect transformedShadowClipRect = transform.TransformBounds(aShadowClipRect);
+ Rect transformedSkipRect = transform.TransformBounds(aSkipRect);
+
+ transformedDestRect.Round();
+ transformedShadowClipRect.Round();
+ transformedSkipRect.RoundIn();
+
+ for (size_t i = 0; i < 4; i++) {
+ aInnerClipRectRadii[i].width =
+ std::floor(scale.width * aInnerClipRectRadii[i].width);
+ aInnerClipRectRadii[i].height =
+ std::floor(scale.height * aInnerClipRectRadii[i].height);
+ }
+
+ mAlphaBoxBlur.BlurInsetBox(aDestinationCtx, transformedDestRect,
+ transformedShadowClipRect, blurRadius,
+ aShadowColor,
+ aHasBorderRadius ? &aInnerClipRectRadii : nullptr,
+ transformedSkipRect, aShadowOffset);
+ return true;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 12:09:23 +0000