Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/layout/painting/DisplayItemClip.cpp b/layout/painting/DisplayItemClip.cpp
new file mode 100644
index 0000000000..78aae2e1ec
--- /dev/null
+++ b/layout/painting/DisplayItemClip.cpp
@@ -0,0 +1,486 @@
+/* -*- 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/. */
+
+#include "DisplayItemClip.h"
+
+#include "gfxContext.h"
+#include "gfxUtils.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/layers/StackingContextHelper.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/webrender/WebRenderTypes.h"
+#include "nsPresContext.h"
+#include "nsCSSRendering.h"
+#include "nsLayoutUtils.h"
+#include "nsRegion.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+
+void DisplayItemClip::SetTo(const nsRect& aRect) { SetTo(aRect, nullptr); }
+
+void DisplayItemClip::SetTo(const nsRect& aRect, const nscoord* aRadii) {
+  mHaveClipRect = true;
+  mClipRect = aRect;
+  if (aRadii) {
+    mRoundedClipRects.SetLength(1);
+    mRoundedClipRects[0].mRect = aRect;
+    memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord) * 8);
+  } else {
+    mRoundedClipRects.Clear();
+  }
+}
+
+void DisplayItemClip::SetTo(const nsRect& aRect, const nsRect& aRoundedRect,
+                            const nscoord* aRadii) {
+  mHaveClipRect = true;
+  mClipRect = aRect;
+  mRoundedClipRects.SetLength(1);
+  mRoundedClipRects[0].mRect = aRoundedRect;
+  memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord) * 8);
+}
+
+bool DisplayItemClip::MayIntersect(const nsRect& aRect) const {
+  if (!mHaveClipRect) {
+    return !aRect.IsEmpty();
+  }
+  nsRect r = aRect.Intersect(mClipRect);
+  if (r.IsEmpty()) {
+    return false;
+  }
+  for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
+    const RoundedRect& rr = mRoundedClipRects[i];
+    if (!nsLayoutUtils::RoundedRectIntersectsRect(rr.mRect, rr.mRadii, r)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void DisplayItemClip::IntersectWith(const DisplayItemClip& aOther) {
+  if (!aOther.mHaveClipRect) {
+    return;
+  }
+  if (!mHaveClipRect) {
+    *this = aOther;
+    return;
+  }
+  if (!mClipRect.IntersectRect(mClipRect, aOther.mClipRect)) {
+    mRoundedClipRects.Clear();
+    return;
+  }
+  mRoundedClipRects.AppendElements(aOther.mRoundedClipRects);
+}
+
+void DisplayItemClip::ApplyTo(gfxContext* aContext, int32_t A2D) const {
+  ApplyRectTo(aContext, A2D);
+  ApplyRoundedRectClipsTo(aContext, A2D, 0, mRoundedClipRects.Length());
+}
+
+void DisplayItemClip::ApplyRectTo(gfxContext* aContext, int32_t A2D) const {
+  aContext->NewPath();
+  gfxRect clip = nsLayoutUtils::RectToGfxRect(mClipRect, A2D);
+  aContext->SnappedRectangle(clip);
+  aContext->Clip();
+}
+
+void DisplayItemClip::ApplyRoundedRectClipsTo(gfxContext* aContext, int32_t A2D,
+                                              uint32_t aBegin,
+                                              uint32_t aEnd) const {
+  DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
+
+  aEnd = std::min<uint32_t>(aEnd, mRoundedClipRects.Length());
+
+  for (uint32_t i = aBegin; i < aEnd; ++i) {
+    RefPtr<Path> roundedRect =
+        MakeRoundedRectPath(aDrawTarget, A2D, mRoundedClipRects[i]);
+    aContext->Clip(roundedRect);
+  }
+}
+
+void DisplayItemClip::FillIntersectionOfRoundedRectClips(
+    gfxContext* aContext, const DeviceColor& aColor,
+    int32_t aAppUnitsPerDevPixel) const {
+  DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
+
+  uint32_t end = mRoundedClipRects.Length();
+  if (!end) {
+    return;
+  }
+
+  // Push clips for any rects that come BEFORE the rect at |aEnd - 1|, if any:
+  ApplyRoundedRectClipsTo(aContext, aAppUnitsPerDevPixel, 0, end - 1);
+
+  // Now fill the rect at |aEnd - 1|:
+  RefPtr<Path> roundedRect = MakeRoundedRectPath(
+      aDrawTarget, aAppUnitsPerDevPixel, mRoundedClipRects[end - 1]);
+  aDrawTarget.Fill(roundedRect, ColorPattern(aColor));
+
+  // Finally, pop any clips that we may have pushed:
+  for (uint32_t i = 0; i < end - 1; ++i) {
+    aContext->PopClip();
+  }
+}
+
+already_AddRefed<Path> DisplayItemClip::MakeRoundedRectPath(
+    DrawTarget& aDrawTarget, int32_t A2D, const RoundedRect& aRoundRect) const {
+  RectCornerRadii pixelRadii;
+  nsCSSRendering::ComputePixelRadii(aRoundRect.mRadii, A2D, &pixelRadii);
+
+  Rect rect = NSRectToSnappedRect(aRoundRect.mRect, A2D, aDrawTarget);
+
+  return MakePathForRoundedRect(aDrawTarget, rect, pixelRadii);
+}
+
+nsRect DisplayItemClip::ApproximateIntersectInward(const nsRect& aRect) const {
+  nsRect r = aRect;
+  if (mHaveClipRect) {
+    r.IntersectRect(r, mClipRect);
+  }
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    const RoundedRect& rr = mRoundedClipRects[i];
+    nsRegion rgn =
+        nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, r);
+    r = rgn.GetLargestRectangle();
+  }
+  return r;
+}
+
+// Test if (aXPoint, aYPoint) is in the ellipse with center (aXCenter, aYCenter)
+// and radii aXRadius, aYRadius.
+static bool IsInsideEllipse(nscoord aXRadius, nscoord aXCenter, nscoord aXPoint,
+                            nscoord aYRadius, nscoord aYCenter,
+                            nscoord aYPoint) {
+  float scaledX = float(aXPoint - aXCenter) / float(aXRadius);
+  float scaledY = float(aYPoint - aYCenter) / float(aYRadius);
+  return scaledX * scaledX + scaledY * scaledY < 1.0f;
+}
+
+bool DisplayItemClip::IsRectClippedByRoundedCorner(const nsRect& aRect) const {
+  if (mRoundedClipRects.IsEmpty()) return false;
+
+  nsRect rect;
+  rect.IntersectRect(aRect, NonRoundedIntersection());
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    const RoundedRect& rr = mRoundedClipRects[i];
+    // top left
+    if (rect.x < rr.mRect.x + rr.mRadii[eCornerTopLeftX] &&
+        rect.y < rr.mRect.y + rr.mRadii[eCornerTopLeftY]) {
+      if (!IsInsideEllipse(rr.mRadii[eCornerTopLeftX],
+                           rr.mRect.x + rr.mRadii[eCornerTopLeftX], rect.x,
+                           rr.mRadii[eCornerTopLeftY],
+                           rr.mRect.y + rr.mRadii[eCornerTopLeftY], rect.y)) {
+        return true;
+      }
+    }
+    // top right
+    if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[eCornerTopRightX] &&
+        rect.y < rr.mRect.y + rr.mRadii[eCornerTopRightY]) {
+      if (!IsInsideEllipse(rr.mRadii[eCornerTopRightX],
+                           rr.mRect.XMost() - rr.mRadii[eCornerTopRightX],
+                           rect.XMost(), rr.mRadii[eCornerTopRightY],
+                           rr.mRect.y + rr.mRadii[eCornerTopRightY], rect.y)) {
+        return true;
+      }
+    }
+    // bottom left
+    if (rect.x < rr.mRect.x + rr.mRadii[eCornerBottomLeftX] &&
+        rect.YMost() > rr.mRect.YMost() - rr.mRadii[eCornerBottomLeftY]) {
+      if (!IsInsideEllipse(rr.mRadii[eCornerBottomLeftX],
+                           rr.mRect.x + rr.mRadii[eCornerBottomLeftX], rect.x,
+                           rr.mRadii[eCornerBottomLeftY],
+                           rr.mRect.YMost() - rr.mRadii[eCornerBottomLeftY],
+                           rect.YMost())) {
+        return true;
+      }
+    }
+    // bottom right
+    if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[eCornerBottomRightX] &&
+        rect.YMost() > rr.mRect.YMost() - rr.mRadii[eCornerBottomRightY]) {
+      if (!IsInsideEllipse(rr.mRadii[eCornerBottomRightX],
+                           rr.mRect.XMost() - rr.mRadii[eCornerBottomRightX],
+                           rect.XMost(), rr.mRadii[eCornerBottomRightY],
+                           rr.mRect.YMost() - rr.mRadii[eCornerBottomRightY],
+                           rect.YMost())) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+nsRect DisplayItemClip::NonRoundedIntersection() const {
+  NS_ASSERTION(mHaveClipRect, "Must have a clip rect!");
+  nsRect result = mClipRect;
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    result.IntersectRect(result, mRoundedClipRects[i].mRect);
+  }
+  return result;
+}
+
+bool DisplayItemClip::IsRectAffectedByClip(const nsRect& aRect) const {
+  if (mHaveClipRect && !mClipRect.Contains(aRect)) {
+    return true;
+  }
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    const RoundedRect& rr = mRoundedClipRects[i];
+    nsRegion rgn =
+        nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, aRect);
+    if (!rgn.Contains(aRect)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool DisplayItemClip::IsRectAffectedByClip(const nsIntRect& aRect,
+                                           float aXScale, float aYScale,
+                                           int32_t A2D) const {
+  if (mHaveClipRect) {
+    nsIntRect pixelClipRect =
+        mClipRect.ScaleToNearestPixels(aXScale, aYScale, A2D);
+    if (!pixelClipRect.Contains(aRect)) {
+      return true;
+    }
+  }
+
+  // Rounded rect clipping only snaps to user-space pixels, not device space.
+  nsIntRect unscaled = aRect;
+  unscaled.Scale(1 / aXScale, 1 / aYScale);
+
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    const RoundedRect& rr = mRoundedClipRects[i];
+
+    nsIntRect pixelRect = rr.mRect.ToNearestPixels(A2D);
+
+    RectCornerRadii pixelRadii;
+    nsCSSRendering::ComputePixelRadii(rr.mRadii, A2D, &pixelRadii);
+
+    nsIntRegion rgn = nsLayoutUtils::RoundedRectIntersectIntRect(
+        pixelRect, pixelRadii, unscaled);
+    if (!rgn.Contains(unscaled)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+nsRect DisplayItemClip::ApplyNonRoundedIntersection(const nsRect& aRect) const {
+  if (!mHaveClipRect) {
+    return aRect;
+  }
+
+  nsRect result = aRect.Intersect(mClipRect);
+  for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
+    result = result.Intersect(mRoundedClipRects[i].mRect);
+  }
+  return result;
+}
+
+void DisplayItemClip::RemoveRoundedCorners() {
+  if (mRoundedClipRects.IsEmpty()) return;
+
+  mClipRect = NonRoundedIntersection();
+  mRoundedClipRects.Clear();
+}
+
+// Computes the difference between aR1 and aR2, limited to aBounds.
+static void AccumulateRectDifference(const nsRect& aR1, const nsRect& aR2,
+                                     const nsRect& aBounds, nsRegion* aOut) {
+  if (aR1.IsEqualInterior(aR2)) return;
+  nsRegion r;
+  r.Xor(aR1, aR2);
+  r.And(r, aBounds);
+  aOut->Or(*aOut, r);
+}
+
+static void AccumulateRoundedRectDifference(
+    const DisplayItemClip::RoundedRect& aR1,
+    const DisplayItemClip::RoundedRect& aR2, const nsRect& aBounds,
+    const nsRect& aOtherBounds, nsRegion* aOut) {
+  const nsRect& rect1 = aR1.mRect;
+  const nsRect& rect2 = aR2.mRect;
+
+  // If the two rectangles are totally disjoint, just add them both - otherwise
+  // we'd end up adding one big enclosing rect
+  if (!rect1.Intersects(rect2) ||
+      memcmp(aR1.mRadii, aR2.mRadii, sizeof(aR1.mRadii))) {
+    aOut->Or(*aOut, rect1.Intersect(aBounds));
+    aOut->Or(*aOut, rect2.Intersect(aOtherBounds));
+    return;
+  }
+
+  nscoord lowestBottom = std::max(rect1.YMost(), rect2.YMost());
+  nscoord highestTop = std::min(rect1.Y(), rect2.Y());
+  nscoord maxRight = std::max(rect1.XMost(), rect2.XMost());
+  nscoord minLeft = std::min(rect1.X(), rect2.X());
+
+  // At this point, we know that the radii haven't changed, and that the bounds
+  // are different in some way. To explain how this works, consider the case
+  // where the rounded rect has just been translated along the X direction.
+  // |          ______________________ _ _ _ _ _ _            |
+  // |        /           /            \           \          |
+  // |       |                          |                     |
+  // |       |     aR1   |              |     aR2   |         |
+  // |       |                          |                     |
+  // |        \ __________\___________ / _ _ _ _ _ /          |
+  // |                                                        |
+  // The invalidation region will be as if we lopped off the left rounded part
+  // of aR2, and the right rounded part of aR1, and XOR'd them:
+  // |          ______________________ _ _ _ _ _ _            |
+  // |       -/-----------/-          -\-----------\-         |
+  // |       |--------------          --|------------         |
+  // |       |-----aR1---|--          --|-----aR2---|         |
+  // |       |--------------          --|------------         |
+  // |       -\ __________\-__________-/ _ _ _ _ _ /-          |
+  // |                                                        |
+  // The logic below just implements this idea, but generalized to both the
+  // X and Y dimensions. The "(...)Adjusted(...)" values represent the lopped
+  // off sides.
+  nscoord highestAdjustedBottom = std::min(
+      rect1.YMost() - aR1.mRadii[eCornerBottomLeftY],
+      std::min(rect1.YMost() - aR1.mRadii[eCornerBottomRightY],
+               std::min(rect2.YMost() - aR2.mRadii[eCornerBottomLeftY],
+                        rect2.YMost() - aR2.mRadii[eCornerBottomRightY])));
+  nscoord lowestAdjustedTop =
+      std::max(rect1.Y() + aR1.mRadii[eCornerTopLeftY],
+               std::max(rect1.Y() + aR1.mRadii[eCornerTopRightY],
+                        std::max(rect2.Y() + aR2.mRadii[eCornerTopLeftY],
+                                 rect2.Y() + aR2.mRadii[eCornerTopRightY])));
+
+  nscoord minAdjustedRight = std::min(
+      rect1.XMost() - aR1.mRadii[eCornerTopRightX],
+      std::min(rect1.XMost() - aR1.mRadii[eCornerBottomRightX],
+               std::min(rect2.XMost() - aR2.mRadii[eCornerTopRightX],
+                        rect2.XMost() - aR2.mRadii[eCornerBottomRightX])));
+  nscoord maxAdjustedLeft =
+      std::max(rect1.X() + aR1.mRadii[eCornerTopLeftX],
+               std::max(rect1.X() + aR1.mRadii[eCornerBottomLeftX],
+                        std::max(rect2.X() + aR2.mRadii[eCornerTopLeftX],
+                                 rect2.X() + aR2.mRadii[eCornerBottomLeftX])));
+
+  // We only want to add an invalidation rect if the bounds have changed. If we
+  // always added all of the 4 rects below, we would always be invalidating a
+  // border around the rects, even in cases where we just translated along the X
+  // or Y axis.
+  nsRegion r;
+  // First, or with the Y delta rects, wide along the X axis
+  if (rect1.Y() != rect2.Y()) {
+    r.Or(r, nsRect(minLeft, highestTop, maxRight - minLeft,
+                   lowestAdjustedTop - highestTop));
+  }
+  if (rect1.YMost() != rect2.YMost()) {
+    r.Or(r, nsRect(minLeft, highestAdjustedBottom, maxRight - minLeft,
+                   lowestBottom - highestAdjustedBottom));
+  }
+  // Then, or with the X delta rects, wide along the Y axis
+  if (rect1.X() != rect2.X()) {
+    r.Or(r, nsRect(minLeft, highestTop, maxAdjustedLeft - minLeft,
+                   lowestBottom - highestTop));
+  }
+  if (rect1.XMost() != rect2.XMost()) {
+    r.Or(r, nsRect(minAdjustedRight, highestTop, maxRight - minAdjustedRight,
+                   lowestBottom - highestTop));
+  }
+
+  r.And(r, aBounds.Union(aOtherBounds));
+  aOut->Or(*aOut, r);
+}
+
+void DisplayItemClip::AddOffsetAndComputeDifference(
+    const nsPoint& aOffset, const nsRect& aBounds,
+    const DisplayItemClip& aOther, const nsRect& aOtherBounds,
+    nsRegion* aDifference) {
+  if (mHaveClipRect != aOther.mHaveClipRect ||
+      mRoundedClipRects.Length() != aOther.mRoundedClipRects.Length()) {
+    aDifference->Or(*aDifference, aBounds);
+    aDifference->Or(*aDifference, aOtherBounds);
+    return;
+  }
+  if (mHaveClipRect) {
+    AccumulateRectDifference(mClipRect + aOffset, aOther.mClipRect,
+                             aBounds.Union(aOtherBounds), aDifference);
+  }
+  for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
+    if (mRoundedClipRects[i] + aOffset != aOther.mRoundedClipRects[i]) {
+      AccumulateRoundedRectDifference(mRoundedClipRects[i] + aOffset,
+                                      aOther.mRoundedClipRects[i], aBounds,
+                                      aOtherBounds, aDifference);
+    }
+  }
+}
+
+void DisplayItemClip::AppendRoundedRects(nsTArray<RoundedRect>* aArray) const {
+  aArray->AppendElements(mRoundedClipRects.Elements(),
+                         mRoundedClipRects.Length());
+}
+
+bool DisplayItemClip::ComputeRegionInClips(const DisplayItemClip* aOldClip,
+                                           const nsPoint& aShift,
+                                           nsRegion* aCombined) const {
+  if (!mHaveClipRect || (aOldClip && !aOldClip->mHaveClipRect)) {
+    return false;
+  }
+
+  if (aOldClip) {
+    *aCombined = aOldClip->NonRoundedIntersection();
+    aCombined->MoveBy(aShift);
+    aCombined->Or(*aCombined, NonRoundedIntersection());
+  } else {
+    *aCombined = NonRoundedIntersection();
+  }
+  return true;
+}
+
+void DisplayItemClip::MoveBy(const nsPoint& aPoint) {
+  if (!mHaveClipRect) {
+    return;
+  }
+  mClipRect += aPoint;
+  for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
+    mRoundedClipRects[i].mRect += aPoint;
+  }
+}
+
+static StaticAutoPtr<DisplayItemClip> gNoClip;
+
+const DisplayItemClip& DisplayItemClip::NoClip() {
+  if (!gNoClip) {
+    gNoClip = new DisplayItemClip();
+  }
+  return *gNoClip;
+}
+
+void DisplayItemClip::Shutdown() { gNoClip = nullptr; }
+
+nsCString DisplayItemClip::ToString() const {
+  nsAutoCString str;
+  if (mHaveClipRect) {
+    str.AppendPrintf("%d,%d,%d,%d", mClipRect.x, mClipRect.y, mClipRect.width,
+                     mClipRect.height);
+    for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
+      const RoundedRect& r = mRoundedClipRects[i];
+      str.AppendPrintf(" [%d,%d,%d,%d corners %d,%d,%d,%d,%d,%d,%d,%d]",
+                       r.mRect.x, r.mRect.y, r.mRect.width, r.mRect.height,
+                       r.mRadii[0], r.mRadii[1], r.mRadii[2], r.mRadii[3],
+                       r.mRadii[4], r.mRadii[5], r.mRadii[6], r.mRadii[7]);
+    }
+  }
+  return std::move(str);
+}
+
+void DisplayItemClip::ToComplexClipRegions(
+    int32_t aAppUnitsPerDevPixel,
+    nsTArray<wr::ComplexClipRegion>& aOutArray) const {
+  for (const auto& clipRect : mRoundedClipRects) {
+    aOutArray.AppendElement(wr::ToComplexClipRegion(
+        clipRect.mRect, clipRect.mRadii, aAppUnitsPerDevPixel));
+  }
+}
+
+}  // namespace mozilla