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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
// 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
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
// 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