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-rw-r--r--layout/svg/SVGViewportFrame.cpp254
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diff --git a/layout/svg/SVGViewportFrame.cpp b/layout/svg/SVGViewportFrame.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/. */
+
+// Main header first:
+#include "SVGViewportFrame.h"
+
+// Keep others in (case-insensitive) order:
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "mozilla/ISVGDisplayableFrame.h"
+#include "mozilla/SVGContainerFrame.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/dom/SVGViewportElement.h"
+#include "nsLayoutUtils.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// ISVGDisplayableFrame methods
+
+void SVGViewportFrame::PaintSVG(gfxContext& aContext,
+ const gfxMatrix& aTransform,
+ imgDrawingParams& aImgParams) {
+ NS_ASSERTION(HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
+ "Only painting of non-display SVG should take this code path");
+
+ gfxClipAutoSaveRestore autoSaveClip(&aContext);
+
+ if (StyleDisplay()->IsScrollableOverflow()) {
+ float x, y, width, height;
+ static_cast<SVGViewportElement*>(GetContent())
+ ->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
+
+ if (width <= 0 || height <= 0) {
+ return;
+ }
+
+ gfxRect clipRect = SVGUtils::GetClipRectForFrame(this, x, y, width, height);
+ autoSaveClip.TransformedClip(aTransform, clipRect);
+ }
+
+ SVGDisplayContainerFrame::PaintSVG(aContext, aTransform, aImgParams);
+}
+
+void SVGViewportFrame::ReflowSVG() {
+ // mRect must be set before FinishAndStoreOverflow is called in order
+ // for our overflow areas to be clipped correctly.
+ float x, y, width, height;
+ static_cast<SVGViewportElement*>(GetContent())
+ ->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
+ mRect = nsLayoutUtils::RoundGfxRectToAppRect(gfxRect(x, y, width, height),
+ AppUnitsPerCSSPixel());
+
+ // If we have a filter, we need to invalidate ourselves because filter
+ // output can change even if none of our descendants need repainting.
+ if (StyleEffects()->HasFilters()) {
+ InvalidateFrame();
+ }
+
+ SVGDisplayContainerFrame::ReflowSVG();
+}
+
+void SVGViewportFrame::NotifySVGChanged(uint32_t aFlags) {
+ MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
+ "Invalidation logic may need adjusting");
+
+ if (aFlags & COORD_CONTEXT_CHANGED) {
+ SVGViewportElement* svg = static_cast<SVGViewportElement*>(GetContent());
+
+ bool xOrYIsPercentage =
+ svg->mLengthAttributes[SVGViewportElement::ATTR_X].IsPercentage() ||
+ svg->mLengthAttributes[SVGViewportElement::ATTR_Y].IsPercentage();
+ bool widthOrHeightIsPercentage =
+ svg->mLengthAttributes[SVGViewportElement::ATTR_WIDTH].IsPercentage() ||
+ svg->mLengthAttributes[SVGViewportElement::ATTR_HEIGHT].IsPercentage();
+
+ if (xOrYIsPercentage || widthOrHeightIsPercentage) {
+ // Ancestor changes can't affect how we render from the perspective of
+ // any rendering observers that we may have, so we don't need to
+ // invalidate them. We also don't need to invalidate ourself, since our
+ // changed ancestor will have invalidated its entire area, which includes
+ // our area.
+ // For perf reasons we call this before calling NotifySVGChanged() below.
+ SVGUtils::ScheduleReflowSVG(this);
+ }
+
+ // Coordinate context changes affect mCanvasTM if we have a
+ // percentage 'x' or 'y', or if we have a percentage 'width' or 'height' AND
+ // a 'viewBox'.
+
+ if (!(aFlags & TRANSFORM_CHANGED) &&
+ (xOrYIsPercentage ||
+ (widthOrHeightIsPercentage && svg->HasViewBox()))) {
+ aFlags |= TRANSFORM_CHANGED;
+ }
+
+ if (svg->HasViewBox() || !widthOrHeightIsPercentage) {
+ // Remove COORD_CONTEXT_CHANGED, since we establish the coordinate
+ // context for our descendants and this notification won't change its
+ // dimensions:
+ aFlags &= ~COORD_CONTEXT_CHANGED;
+
+ if (!aFlags) {
+ return; // No notification flags left
+ }
+ }
+ }
+
+ SVGDisplayContainerFrame::NotifySVGChanged(aFlags);
+}
+
+SVGBBox SVGViewportFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
+ uint32_t aFlags) {
+ // XXXjwatt It seems like authors would want the result to be clipped by the
+ // viewport we establish if IsScrollableOverflow() is true. We should
+ // consider doing that. See bug 1350755.
+
+ SVGBBox bbox;
+
+ if (aFlags & SVGUtils::eForGetClientRects) {
+ // XXXjwatt For consistency with the old code this code includes the
+ // viewport we establish in the result, but only includes the bounds of our
+ // descendants if they are not clipped to that viewport. However, this is
+ // both inconsistent with Chrome and with the specs. See bug 1350755.
+ // Ideally getClientRects/getBoundingClientRect should be consistent with
+ // getBBox.
+ float x, y, w, h;
+ static_cast<SVGViewportElement*>(GetContent())
+ ->GetAnimatedLengthValues(&x, &y, &w, &h, nullptr);
+ if (w < 0.0f) w = 0.0f;
+ if (h < 0.0f) h = 0.0f;
+ Rect viewport(x, y, w, h);
+ bbox = aToBBoxUserspace.TransformBounds(viewport);
+ if (StyleDisplay()->IsScrollableOverflow()) {
+ return bbox;
+ }
+ // Else we're not clipping to our viewport so we fall through and include
+ // the bounds of our children.
+ }
+
+ SVGBBox descendantsBbox =
+ SVGDisplayContainerFrame::GetBBoxContribution(aToBBoxUserspace, aFlags);
+
+ bbox.UnionEdges(descendantsBbox);
+
+ return bbox;
+}
+
+nsresult SVGViewportFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsAtom* aAttribute,
+ int32_t aModType) {
+ if (aNameSpaceID == kNameSpaceID_None &&
+ !HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
+ SVGViewportElement* content =
+ static_cast<SVGViewportElement*>(GetContent());
+
+ if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height) {
+ nsLayoutUtils::PostRestyleEvent(
+ mContent->AsElement(), RestyleHint{0},
+ nsChangeHint_InvalidateRenderingObservers);
+ SVGUtils::ScheduleReflowSVG(this);
+
+ if (content->HasViewBoxOrSyntheticViewBox()) {
+ // make sure our cached transform matrix gets (lazily) updated
+ mCanvasTM = nullptr;
+ content->ChildrenOnlyTransformChanged();
+ SVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
+ } else {
+ uint32_t flags = COORD_CONTEXT_CHANGED;
+ if (mCanvasTM && mCanvasTM->IsSingular()) {
+ mCanvasTM = nullptr;
+ flags |= TRANSFORM_CHANGED;
+ }
+ SVGUtils::NotifyChildrenOfSVGChange(this, flags);
+ }
+
+ } else if (aAttribute == nsGkAtoms::transform ||
+ aAttribute == nsGkAtoms::preserveAspectRatio ||
+ aAttribute == nsGkAtoms::viewBox || aAttribute == nsGkAtoms::x ||
+ aAttribute == nsGkAtoms::y) {
+ // make sure our cached transform matrix gets (lazily) updated
+ mCanvasTM = nullptr;
+
+ SVGUtils::NotifyChildrenOfSVGChange(
+ this, aAttribute == nsGkAtoms::viewBox
+ ? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED
+ : TRANSFORM_CHANGED);
+
+ // We don't invalidate for transform changes (the layers code does that).
+ // Also note that SVGTransformableElement::GetAttributeChangeHint will
+ // return nsChangeHint_UpdateOverflow for "transform" attribute changes
+ // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
+
+ if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
+ nsLayoutUtils::PostRestyleEvent(
+ mContent->AsElement(), RestyleHint{0},
+ nsChangeHint_InvalidateRenderingObservers);
+ SVGUtils::ScheduleReflowSVG(this);
+ } else if (aAttribute == nsGkAtoms::viewBox ||
+ (aAttribute == nsGkAtoms::preserveAspectRatio &&
+ content->HasViewBoxOrSyntheticViewBox())) {
+ content->ChildrenOnlyTransformChanged();
+ // SchedulePaint sets a global state flag so we only need to call it
+ // once (on ourself is fine), not once on each child (despite bug
+ // 828240).
+ SchedulePaint();
+ }
+ }
+ }
+
+ return NS_OK;
+}
+
+nsIFrame* SVGViewportFrame::GetFrameForPoint(const gfxPoint& aPoint) {
+ MOZ_ASSERT_UNREACHABLE("A clipPath cannot contain svg or symbol elements");
+ return nullptr;
+}
+
+//----------------------------------------------------------------------
+// ISVGSVGFrame methods:
+
+void SVGViewportFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) {
+ // The dimensions of inner-<svg> frames are purely defined by their "width"
+ // and "height" attributes, and transform changes can only occur as a result
+ // of changes to their "width", "height", "viewBox" or "preserveAspectRatio"
+ // attributes. Changes to all of these attributes are handled in
+ // AttributeChanged(), so we should never be called.
+ NS_ERROR("Not called for SVGViewportFrame");
+}
+
+//----------------------------------------------------------------------
+// SVGContainerFrame methods:
+
+bool SVGViewportFrame::HasChildrenOnlyTransform(gfx::Matrix* aTransform) const {
+ SVGViewportElement* content = static_cast<SVGViewportElement*>(GetContent());
+
+ if (content->HasViewBoxOrSyntheticViewBox()) {
+ // XXX Maybe return false if the transform is the identity transform?
+ if (aTransform) {
+ *aTransform = content->GetViewBoxTransform();
+ }
+ return true;
+ }
+ return false;
+}
+
+} // namespace mozilla