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a1b7878e33
Take care to restore only the parts of the gfxContext that we need to because saving and restoring the complete gfxContext is expensive. Differential Revision: https://phabricator.services.mozilla.com/D178304
254 lines
9.6 KiB
C++
254 lines
9.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Main header first:
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#include "SVGViewportFrame.h"
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// Keep others in (case-insensitive) order:
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#include "gfx2DGlue.h"
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#include "gfxContext.h"
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#include "mozilla/ISVGDisplayableFrame.h"
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#include "mozilla/SVGContainerFrame.h"
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#include "mozilla/SVGUtils.h"
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#include "mozilla/dom/SVGViewportElement.h"
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#include "nsLayoutUtils.h"
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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using namespace mozilla::image;
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namespace mozilla {
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//----------------------------------------------------------------------
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// ISVGDisplayableFrame methods
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void SVGViewportFrame::PaintSVG(gfxContext& aContext,
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const gfxMatrix& aTransform,
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imgDrawingParams& aImgParams) {
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NS_ASSERTION(HasAnyStateBits(NS_FRAME_IS_NONDISPLAY),
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"Only painting of non-display SVG should take this code path");
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gfxClipAutoSaveRestore autoSaveClip(&aContext);
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if (StyleDisplay()->IsScrollableOverflow()) {
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float x, y, width, height;
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static_cast<SVGViewportElement*>(GetContent())
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->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
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if (width <= 0 || height <= 0) {
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return;
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}
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gfxRect clipRect = SVGUtils::GetClipRectForFrame(this, x, y, width, height);
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autoSaveClip.TransformedClip(aTransform, clipRect);
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}
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SVGDisplayContainerFrame::PaintSVG(aContext, aTransform, aImgParams);
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}
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void SVGViewportFrame::ReflowSVG() {
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// mRect must be set before FinishAndStoreOverflow is called in order
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// for our overflow areas to be clipped correctly.
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float x, y, width, height;
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static_cast<SVGViewportElement*>(GetContent())
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->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
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mRect = nsLayoutUtils::RoundGfxRectToAppRect(gfxRect(x, y, width, height),
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AppUnitsPerCSSPixel());
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// If we have a filter, we need to invalidate ourselves because filter
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// output can change even if none of our descendants need repainting.
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if (StyleEffects()->HasFilters()) {
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InvalidateFrame();
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}
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SVGDisplayContainerFrame::ReflowSVG();
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}
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void SVGViewportFrame::NotifySVGChanged(uint32_t aFlags) {
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MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
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"Invalidation logic may need adjusting");
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if (aFlags & COORD_CONTEXT_CHANGED) {
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SVGViewportElement* svg = static_cast<SVGViewportElement*>(GetContent());
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bool xOrYIsPercentage =
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svg->mLengthAttributes[SVGViewportElement::ATTR_X].IsPercentage() ||
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svg->mLengthAttributes[SVGViewportElement::ATTR_Y].IsPercentage();
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bool widthOrHeightIsPercentage =
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svg->mLengthAttributes[SVGViewportElement::ATTR_WIDTH].IsPercentage() ||
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svg->mLengthAttributes[SVGViewportElement::ATTR_HEIGHT].IsPercentage();
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if (xOrYIsPercentage || widthOrHeightIsPercentage) {
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// Ancestor changes can't affect how we render from the perspective of
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// any rendering observers that we may have, so we don't need to
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// invalidate them. We also don't need to invalidate ourself, since our
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// changed ancestor will have invalidated its entire area, which includes
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// our area.
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// For perf reasons we call this before calling NotifySVGChanged() below.
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SVGUtils::ScheduleReflowSVG(this);
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}
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// Coordinate context changes affect mCanvasTM if we have a
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// percentage 'x' or 'y', or if we have a percentage 'width' or 'height' AND
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// a 'viewBox'.
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if (!(aFlags & TRANSFORM_CHANGED) &&
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(xOrYIsPercentage ||
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(widthOrHeightIsPercentage && svg->HasViewBox()))) {
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aFlags |= TRANSFORM_CHANGED;
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}
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if (svg->HasViewBox() || !widthOrHeightIsPercentage) {
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// Remove COORD_CONTEXT_CHANGED, since we establish the coordinate
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// context for our descendants and this notification won't change its
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// dimensions:
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aFlags &= ~COORD_CONTEXT_CHANGED;
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if (!aFlags) {
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return; // No notification flags left
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}
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}
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}
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SVGDisplayContainerFrame::NotifySVGChanged(aFlags);
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}
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SVGBBox SVGViewportFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
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uint32_t aFlags) {
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// XXXjwatt It seems like authors would want the result to be clipped by the
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// viewport we establish if IsScrollableOverflow() is true. We should
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// consider doing that. See bug 1350755.
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SVGBBox bbox;
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if (aFlags & SVGUtils::eForGetClientRects) {
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// XXXjwatt For consistency with the old code this code includes the
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// viewport we establish in the result, but only includes the bounds of our
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// descendants if they are not clipped to that viewport. However, this is
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// both inconsistent with Chrome and with the specs. See bug 1350755.
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// Ideally getClientRects/getBoundingClientRect should be consistent with
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// getBBox.
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float x, y, w, h;
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static_cast<SVGViewportElement*>(GetContent())
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->GetAnimatedLengthValues(&x, &y, &w, &h, nullptr);
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if (w < 0.0f) w = 0.0f;
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if (h < 0.0f) h = 0.0f;
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Rect viewport(x, y, w, h);
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bbox = aToBBoxUserspace.TransformBounds(viewport);
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if (StyleDisplay()->IsScrollableOverflow()) {
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return bbox;
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}
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// Else we're not clipping to our viewport so we fall through and include
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// the bounds of our children.
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}
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SVGBBox descendantsBbox =
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SVGDisplayContainerFrame::GetBBoxContribution(aToBBoxUserspace, aFlags);
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bbox.UnionEdges(descendantsBbox);
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return bbox;
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}
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nsresult SVGViewportFrame::AttributeChanged(int32_t aNameSpaceID,
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nsAtom* aAttribute,
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int32_t aModType) {
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if (aNameSpaceID == kNameSpaceID_None &&
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!HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
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SVGViewportElement* content =
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static_cast<SVGViewportElement*>(GetContent());
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if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height) {
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nsLayoutUtils::PostRestyleEvent(
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mContent->AsElement(), RestyleHint{0},
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nsChangeHint_InvalidateRenderingObservers);
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SVGUtils::ScheduleReflowSVG(this);
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if (content->HasViewBoxOrSyntheticViewBox()) {
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// make sure our cached transform matrix gets (lazily) updated
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mCanvasTM = nullptr;
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content->ChildrenOnlyTransformChanged();
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SVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
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} else {
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uint32_t flags = COORD_CONTEXT_CHANGED;
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if (mCanvasTM && mCanvasTM->IsSingular()) {
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mCanvasTM = nullptr;
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flags |= TRANSFORM_CHANGED;
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}
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SVGUtils::NotifyChildrenOfSVGChange(this, flags);
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}
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} else if (aAttribute == nsGkAtoms::transform ||
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aAttribute == nsGkAtoms::preserveAspectRatio ||
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aAttribute == nsGkAtoms::viewBox || aAttribute == nsGkAtoms::x ||
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aAttribute == nsGkAtoms::y) {
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// make sure our cached transform matrix gets (lazily) updated
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mCanvasTM = nullptr;
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SVGUtils::NotifyChildrenOfSVGChange(
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this, aAttribute == nsGkAtoms::viewBox
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? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED
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: TRANSFORM_CHANGED);
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// We don't invalidate for transform changes (the layers code does that).
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// Also note that SVGTransformableElement::GetAttributeChangeHint will
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// return nsChangeHint_UpdateOverflow for "transform" attribute changes
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// and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
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if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
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nsLayoutUtils::PostRestyleEvent(
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mContent->AsElement(), RestyleHint{0},
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nsChangeHint_InvalidateRenderingObservers);
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SVGUtils::ScheduleReflowSVG(this);
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} else if (aAttribute == nsGkAtoms::viewBox ||
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(aAttribute == nsGkAtoms::preserveAspectRatio &&
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content->HasViewBoxOrSyntheticViewBox())) {
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content->ChildrenOnlyTransformChanged();
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// SchedulePaint sets a global state flag so we only need to call it
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// once (on ourself is fine), not once on each child (despite bug
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// 828240).
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SchedulePaint();
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}
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}
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}
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return NS_OK;
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}
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nsIFrame* SVGViewportFrame::GetFrameForPoint(const gfxPoint& aPoint) {
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MOZ_ASSERT_UNREACHABLE("A clipPath cannot contain svg or symbol elements");
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return nullptr;
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}
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//----------------------------------------------------------------------
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// ISVGSVGFrame methods:
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void SVGViewportFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) {
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// The dimensions of inner-<svg> frames are purely defined by their "width"
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// and "height" attributes, and transform changes can only occur as a result
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// of changes to their "width", "height", "viewBox" or "preserveAspectRatio"
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// attributes. Changes to all of these attributes are handled in
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// AttributeChanged(), so we should never be called.
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NS_ERROR("Not called for SVGViewportFrame");
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}
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//----------------------------------------------------------------------
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// SVGContainerFrame methods:
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bool SVGViewportFrame::HasChildrenOnlyTransform(gfx::Matrix* aTransform) const {
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SVGViewportElement* content = static_cast<SVGViewportElement*>(GetContent());
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if (content->HasViewBoxOrSyntheticViewBox()) {
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// XXX Maybe return false if the transform is the identity transform?
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if (aTransform) {
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*aTransform = content->GetViewBoxTransform();
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}
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return true;
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}
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return false;
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}
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} // namespace mozilla
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