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gecko-dev/layout/svg/nsSVGUtils.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:
// This is also necessary to ensure our definition of M_SQRT1_2 is picked up
#include "nsSVGUtils.h"
#include <algorithm>
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxMatrix.h"
#include "gfxPlatform.h"
#include "gfxRect.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PatternHelpers.h"
#include "mozilla/Preferences.h"
#include "mozilla/SVGContextPaint.h"
#include "nsCSSClipPathInstance.h"
#include "nsCSSFrameConstructor.h"
#include "nsDisplayList.h"
#include "nsFilterInstance.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIFrame.h"
#include "nsIPresShell.h"
#include "nsSVGDisplayableFrame.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsStyleCoord.h"
#include "nsStyleStruct.h"
#include "nsSVGClipPathFrame.h"
#include "nsSVGContainerFrame.h"
#include "SVGObserverUtils.h"
#include "nsSVGFilterPaintCallback.h"
#include "nsSVGForeignObjectFrame.h"
#include "nsSVGInnerSVGFrame.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGLength2.h"
#include "nsSVGMaskFrame.h"
#include "nsSVGOuterSVGFrame.h"
#include "mozilla/dom/SVGClipPathElement.h"
#include "mozilla/dom/SVGPathElement.h"
#include "SVGGeometryElement.h"
#include "SVGGeometryFrame.h"
#include "nsSVGPaintServerFrame.h"
#include "mozilla/dom/SVGViewportElement.h"
#include "nsTextFrame.h"
#include "SVGContentUtils.h"
#include "SVGTextFrame.h"
#include "mozilla/Unused.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
static bool sSVGPathCachingEnabled;
static bool sSVGDisplayListHitTestingEnabled;
static bool sSVGDisplayListPaintingEnabled;
static bool sSVGNewGetBBoxEnabled;
bool
NS_SVGPathCachingEnabled()
{
return sSVGPathCachingEnabled;
}
bool
NS_SVGDisplayListHitTestingEnabled()
{
return sSVGDisplayListHitTestingEnabled;
}
bool
NS_SVGDisplayListPaintingEnabled()
{
return sSVGDisplayListPaintingEnabled;
}
bool
NS_SVGNewGetBBoxEnabled()
{
return sSVGNewGetBBoxEnabled;
}
// we only take the address of this:
static mozilla::gfx::UserDataKey sSVGAutoRenderStateKey;
SVGAutoRenderState::SVGAutoRenderState(DrawTarget* aDrawTarget
MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
: mDrawTarget(aDrawTarget)
, mOriginalRenderState(nullptr)
, mPaintingToWindow(false)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
mOriginalRenderState =
aDrawTarget->RemoveUserData(&sSVGAutoRenderStateKey);
// We always remove ourselves from aContext before it dies, so
// passing nullptr as the destroy function is okay.
aDrawTarget->AddUserData(&sSVGAutoRenderStateKey, this, nullptr);
}
SVGAutoRenderState::~SVGAutoRenderState()
{
mDrawTarget->RemoveUserData(&sSVGAutoRenderStateKey);
if (mOriginalRenderState) {
mDrawTarget->AddUserData(&sSVGAutoRenderStateKey,
mOriginalRenderState, nullptr);
}
}
void
SVGAutoRenderState::SetPaintingToWindow(bool aPaintingToWindow)
{
mPaintingToWindow = aPaintingToWindow;
}
/* static */ bool
SVGAutoRenderState::IsPaintingToWindow(DrawTarget* aDrawTarget)
{
void *state = aDrawTarget->GetUserData(&sSVGAutoRenderStateKey);
if (state) {
return static_cast<SVGAutoRenderState*>(state)->mPaintingToWindow;
}
return false;
}
void
nsSVGUtils::Init()
{
Preferences::AddBoolVarCache(&sSVGPathCachingEnabled,
"svg.path-caching.enabled");
Preferences::AddBoolVarCache(&sSVGDisplayListHitTestingEnabled,
"svg.display-lists.hit-testing.enabled");
Preferences::AddBoolVarCache(&sSVGDisplayListPaintingEnabled,
"svg.display-lists.painting.enabled");
Preferences::AddBoolVarCache(&sSVGNewGetBBoxEnabled,
"svg.new-getBBox.enabled");
}
nsRect
nsSVGUtils::GetPostFilterVisualOverflowRect(nsIFrame *aFrame,
const nsRect &aPreFilterRect)
{
MOZ_ASSERT(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT,
"Called on invalid frame type");
nsSVGFilterProperty *property = SVGObserverUtils::GetFilterProperty(aFrame);
if (!property || !property->ReferencesValidResources()) {
return aPreFilterRect;
}
return nsFilterInstance::GetPostFilterBounds(aFrame, nullptr, &aPreFilterRect);
}
bool
nsSVGUtils::OuterSVGIsCallingReflowSVG(nsIFrame *aFrame)
{
return GetOuterSVGFrame(aFrame)->IsCallingReflowSVG();
}
bool
nsSVGUtils::AnyOuterSVGIsCallingReflowSVG(nsIFrame* aFrame)
{
nsSVGOuterSVGFrame* outer = GetOuterSVGFrame(aFrame);
do {
if (outer->IsCallingReflowSVG()) {
return true;
}
outer = GetOuterSVGFrame(outer->GetParent());
} while (outer);
return false;
}
void
nsSVGUtils::ScheduleReflowSVG(nsIFrame *aFrame)
{
MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG),
"Passed bad frame!");
// If this is triggered, the callers should be fixed to call us before
// ReflowSVG is called. If we try to mark dirty bits on frames while we're
// in the process of removing them, things will get messed up.
NS_ASSERTION(!OuterSVGIsCallingReflowSVG(aFrame),
"Do not call under nsSVGDisplayableFrame::ReflowSVG!");
// We don't call SVGObserverUtils::InvalidateRenderingObservers here because
// we should only be called under InvalidateAndScheduleReflowSVG (which
// calls InvalidateBounds) or nsSVGDisplayContainerFrame::InsertFrames
// (at which point the frame has no observers).
if (aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
return;
}
if (aFrame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_FIRST_REFLOW)) {
// Nothing to do if we're already dirty, or if the outer-<svg>
// hasn't yet had its initial reflow.
return;
}
nsSVGOuterSVGFrame *outerSVGFrame = nullptr;
// We must not add dirty bits to the nsSVGOuterSVGFrame or else
// PresShell::FrameNeedsReflow won't work when we pass it in below.
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG) {
outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(aFrame);
} else {
aFrame->AddStateBits(NS_FRAME_IS_DIRTY);
nsIFrame *f = aFrame->GetParent();
while (f && !(f->GetStateBits() & NS_STATE_IS_OUTER_SVG)) {
if (f->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) {
return;
}
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
f = f->GetParent();
MOZ_ASSERT(f->IsFrameOfType(nsIFrame::eSVG),
"NS_STATE_IS_OUTER_SVG check above not valid!");
}
outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(f);
MOZ_ASSERT(outerSVGFrame && outerSVGFrame->IsSVGOuterSVGFrame(),
"Did not find nsSVGOuterSVGFrame!");
}
if (outerSVGFrame->GetStateBits() & NS_FRAME_IN_REFLOW) {
// We're currently under an nsSVGOuterSVGFrame::Reflow call so there is no
// need to call PresShell::FrameNeedsReflow, since we have an
// nsSVGOuterSVGFrame::DidReflow call pending.
return;
}
nsFrameState dirtyBit =
(outerSVGFrame == aFrame ? NS_FRAME_IS_DIRTY : NS_FRAME_HAS_DIRTY_CHILDREN);
aFrame->PresShell()->FrameNeedsReflow(
outerSVGFrame, nsIPresShell::eResize, dirtyBit);
}
bool
nsSVGUtils::NeedsReflowSVG(nsIFrame *aFrame)
{
MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG),
"SVG uses bits differently!");
// The flags we test here may change, hence why we have this separate
// function.
return NS_SUBTREE_DIRTY(aFrame);
}
void
nsSVGUtils::NotifyAncestorsOfFilterRegionChange(nsIFrame *aFrame)
{
MOZ_ASSERT(!(aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG),
"Not expecting to be called on the outer SVG Frame");
aFrame = aFrame->GetParent();
while (aFrame) {
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG)
return;
nsSVGFilterProperty *property = SVGObserverUtils::GetFilterProperty(aFrame);
if (property) {
property->Invalidate();
}
aFrame = aFrame->GetParent();
}
}
Size
nsSVGUtils::GetContextSize(const nsIFrame* aFrame)
{
Size size;
MOZ_ASSERT(aFrame->GetContent()->IsSVGElement(), "bad cast");
const nsSVGElement* element = static_cast<nsSVGElement*>(aFrame->GetContent());
SVGViewportElement* ctx = element->GetCtx();
if (ctx) {
size.width = ctx->GetLength(SVGContentUtils::X);
size.height = ctx->GetLength(SVGContentUtils::Y);
}
return size;
}
float
nsSVGUtils::ObjectSpace(const gfxRect &aRect, const nsSVGLength2 *aLength)
{
float axis;
switch (aLength->GetCtxType()) {
case SVGContentUtils::X:
axis = aRect.Width();
break;
case SVGContentUtils::Y:
axis = aRect.Height();
break;
case SVGContentUtils::XY:
axis = float(SVGContentUtils::ComputeNormalizedHypotenuse(
aRect.Width(), aRect.Height()));
break;
default:
NS_NOTREACHED("unexpected ctx type");
axis = 0.0f;
break;
}
if (aLength->IsPercentage()) {
// Multiply first to avoid precision errors:
return axis * aLength->GetAnimValInSpecifiedUnits() / 100;
}
return aLength->GetAnimValue(static_cast<SVGViewportElement*>(nullptr)) * axis;
}
float
nsSVGUtils::UserSpace(nsSVGElement *aSVGElement, const nsSVGLength2 *aLength)
{
return aLength->GetAnimValue(aSVGElement);
}
float
nsSVGUtils::UserSpace(nsIFrame *aNonSVGContext, const nsSVGLength2 *aLength)
{
return aLength->GetAnimValue(aNonSVGContext);
}
float
nsSVGUtils::UserSpace(const UserSpaceMetrics& aMetrics, const nsSVGLength2 *aLength)
{
return aLength->GetAnimValue(aMetrics);
}
nsSVGOuterSVGFrame *
nsSVGUtils::GetOuterSVGFrame(nsIFrame *aFrame)
{
while (aFrame) {
if (aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG) {
return static_cast<nsSVGOuterSVGFrame*>(aFrame);
}
aFrame = aFrame->GetParent();
}
return nullptr;
}
nsIFrame*
nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(nsIFrame* aFrame, nsRect* aRect)
{
nsSVGDisplayableFrame* svg = do_QueryFrame(aFrame);
if (!svg)
return nullptr;
nsSVGOuterSVGFrame* outer = GetOuterSVGFrame(aFrame);
if (outer == svg) {
return nullptr;
}
if (aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
*aRect = nsRect(0, 0, 0, 0);
} else {
uint32_t flags = nsSVGUtils::eForGetClientRects |
nsSVGUtils::eBBoxIncludeFill |
nsSVGUtils::eBBoxIncludeStroke |
nsSVGUtils::eBBoxIncludeMarkers;
gfxMatrix m = nsSVGUtils::GetUserToCanvasTM(aFrame);
SVGBBox bbox = nsSVGUtils::GetBBox(aFrame, flags, &m);
nsRect bounds =
nsLayoutUtils::RoundGfxRectToAppRect(bbox,
aFrame->PresContext()->AppUnitsPerDevPixel());
nsMargin bp = outer->GetUsedBorderAndPadding();
*aRect = bounds + nsPoint(bp.left, bp.top);
}
return outer;
}
gfxMatrix
nsSVGUtils::GetCanvasTM(nsIFrame *aFrame)
{
// XXX yuck, we really need a common interface for GetCanvasTM
if (!aFrame->IsFrameOfType(nsIFrame::eSVG)) {
return GetCSSPxToDevPxMatrix(aFrame);
}
LayoutFrameType type = aFrame->Type();
if (type == LayoutFrameType::SVGForeignObject) {
return static_cast<nsSVGForeignObjectFrame*>(aFrame)->GetCanvasTM();
}
if (type == LayoutFrameType::SVGOuterSVG) {
return GetCSSPxToDevPxMatrix(aFrame);
}
nsSVGContainerFrame *containerFrame = do_QueryFrame(aFrame);
if (containerFrame) {
return containerFrame->GetCanvasTM();
}
return static_cast<SVGGeometryFrame*>(aFrame)->GetCanvasTM();
}
gfxMatrix
nsSVGUtils::GetUserToCanvasTM(nsIFrame *aFrame)
{
nsSVGDisplayableFrame* svgFrame = do_QueryFrame(aFrame);
NS_ASSERTION(svgFrame, "bad frame");
gfxMatrix tm;
if (svgFrame) {
nsSVGElement *content = static_cast<nsSVGElement*>(aFrame->GetContent());
tm = content->PrependLocalTransformsTo(
GetCanvasTM(aFrame->GetParent()),
eUserSpaceToParent);
}
return tm;
}
void
nsSVGUtils::NotifyChildrenOfSVGChange(nsIFrame *aFrame, uint32_t aFlags)
{
for (nsIFrame* kid : aFrame->PrincipalChildList()) {
nsSVGDisplayableFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
SVGFrame->NotifySVGChanged(aFlags);
} else {
NS_ASSERTION(kid->IsFrameOfType(nsIFrame::eSVG) ||
nsSVGUtils::IsInSVGTextSubtree(kid),
"SVG frame expected");
// recurse into the children of container frames e.g. <clipPath>, <mask>
// in case they have child frames with transformation matrices
if (kid->IsFrameOfType(nsIFrame::eSVG)) {
NotifyChildrenOfSVGChange(kid, aFlags);
}
}
}
}
// ************************************************************
class SVGPaintCallback : public nsSVGFilterPaintCallback
{
public:
virtual void Paint(gfxContext& aContext, nsIFrame *aTarget,
const gfxMatrix& aTransform,
const nsIntRect* aDirtyRect,
imgDrawingParams& aImgParams) override
{
nsSVGDisplayableFrame* svgFrame = do_QueryFrame(aTarget);
NS_ASSERTION(svgFrame, "Expected SVG frame here");
nsIntRect* dirtyRect = nullptr;
nsIntRect tmpDirtyRect;
// aDirtyRect is in user-space pixels, we need to convert to
// outer-SVG-frame-relative device pixels.
if (aDirtyRect) {
gfxMatrix userToDeviceSpace = aTransform;
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxRect dirtyBounds = userToDeviceSpace.TransformBounds(
gfxRect(aDirtyRect->x, aDirtyRect->y, aDirtyRect->width, aDirtyRect->height));
dirtyBounds.RoundOut();
if (gfxUtils::GfxRectToIntRect(dirtyBounds, &tmpDirtyRect)) {
dirtyRect = &tmpDirtyRect;
}
}
svgFrame->PaintSVG(aContext, nsSVGUtils::GetCSSPxToDevPxMatrix(aTarget),
aImgParams, dirtyRect);
}
};
float
nsSVGUtils::ComputeOpacity(nsIFrame* aFrame, bool aHandleOpacity)
{
float opacity = aFrame->StyleEffects()->mOpacity;
if (opacity != 1.0f &&
(nsSVGUtils::CanOptimizeOpacity(aFrame) || !aHandleOpacity)) {
return 1.0f;
}
return opacity;
}
void
nsSVGUtils::DetermineMaskUsage(nsIFrame* aFrame, bool aHandleOpacity,
MaskUsage& aUsage)
{
aUsage.opacity = ComputeOpacity(aFrame, aHandleOpacity);
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
SVGObserverUtils::EffectProperties effectProperties =
SVGObserverUtils::GetEffectProperties(firstFrame);
const nsStyleSVGReset *svgReset = firstFrame->StyleSVGReset();
nsTArray<nsSVGMaskFrame*> maskFrames = effectProperties.GetMaskFrames();
aUsage.shouldGenerateMaskLayer = (maskFrames.Length() > 0);
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame();
MOZ_ASSERT(!clipPathFrame ||
svgReset->mClipPath.GetType() == StyleShapeSourceType::URL);
switch (svgReset->mClipPath.GetType()) {
case StyleShapeSourceType::URL:
if (clipPathFrame) {
if (clipPathFrame->IsTrivial()) {
aUsage.shouldApplyClipPath = true;
} else {
aUsage.shouldGenerateClipMaskLayer = true;
}
}
break;
case StyleShapeSourceType::Shape:
case StyleShapeSourceType::Box:
aUsage.shouldApplyBasicShape = true;
break;
case StyleShapeSourceType::None:
MOZ_ASSERT(!aUsage.shouldGenerateClipMaskLayer &&
!aUsage.shouldApplyClipPath && !aUsage.shouldApplyBasicShape);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unsupported clip-path type.");
break;
}
}
class MixModeBlender {
public:
typedef mozilla::gfx::Factory Factory;
MixModeBlender(nsIFrame *aFrame, gfxContext* aContext)
: mFrame(aFrame), mSourceCtx(aContext)
{
MOZ_ASSERT(mFrame && mSourceCtx);
}
bool ShouldCreateDrawTargetForBlend() const
{
return mFrame->StyleEffects()->mMixBlendMode != NS_STYLE_BLEND_NORMAL;
}
gfxContext* CreateBlendTarget(const gfxMatrix& aTransform)
{
MOZ_ASSERT(ShouldCreateDrawTargetForBlend());
// Create a temporary context to draw to so we can blend it back with
// another operator.
IntRect drawRect = ComputeClipExtsInDeviceSpace(aTransform);
RefPtr<DrawTarget> targetDT =
mSourceCtx->GetDrawTarget()->CreateSimilarDrawTarget(drawRect.Size(),
SurfaceFormat::B8G8R8A8);
if (!targetDT || !targetDT->IsValid()) {
return nullptr;
}
MOZ_ASSERT(!mTargetCtx,
"CreateBlendTarget is designed to be used once only.");
mTargetCtx = gfxContext::CreateOrNull(targetDT);
MOZ_ASSERT(mTargetCtx); // already checked the draw target above
mTargetCtx->SetMatrix(mSourceCtx->CurrentMatrix() *
Matrix::Translation(-drawRect.TopLeft()));
mTargetOffset = drawRect.TopLeft();
return mTargetCtx;
}
void BlendToTarget()
{
MOZ_ASSERT(ShouldCreateDrawTargetForBlend());
MOZ_ASSERT(mTargetCtx,
"BlendToTarget should be used after CreateBlendTarget.");
RefPtr<SourceSurface> targetSurf = mTargetCtx->GetDrawTarget()->Snapshot();
gfxContextAutoSaveRestore save(mSourceCtx);
mSourceCtx->SetMatrix(Matrix()); // This will be restored right after.
RefPtr<gfxPattern> pattern =
new gfxPattern(targetSurf,
Matrix::Translation(mTargetOffset.x, mTargetOffset.y));
mSourceCtx->SetPattern(pattern);
mSourceCtx->Paint();
}
private:
MixModeBlender() = delete;
IntRect ComputeClipExtsInDeviceSpace(const gfxMatrix& aTransform)
{
// These are used if we require a temporary surface for a custom blend
// mode. Clip the source context first, so that we can generate a smaller
// temporary surface. (Since we will clip this context in
// SetupContextMatrix, a pair of save/restore is needed.)
gfxContextAutoSaveRestore saver(mSourceCtx);
if (!(mFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
// aFrame has a valid visual overflow rect, so clip to it before calling
// PushGroup() to minimize the size of the surfaces we'll composite:
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(mSourceCtx);
mSourceCtx->Multiply(aTransform);
nsRect overflowRect = mFrame->GetVisualOverflowRectRelativeToSelf();
if (mFrame->IsFrameOfType(nsIFrame::eSVGGeometry) ||
nsSVGUtils::IsInSVGTextSubtree(mFrame)) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
overflowRect = overflowRect + mFrame->GetPosition();
}
mSourceCtx->Clip(NSRectToSnappedRect(overflowRect,
mFrame->PresContext()->AppUnitsPerDevPixel(),
*mSourceCtx->GetDrawTarget()));
}
// Get the clip extents in device space.
gfxRect clippedFrameSurfaceRect =
mSourceCtx->GetClipExtents(gfxContext::eDeviceSpace);
clippedFrameSurfaceRect.RoundOut();
IntRect result;
ToRect(clippedFrameSurfaceRect).ToIntRect(&result);
return Factory::CheckSurfaceSize(result.Size()) ? result : IntRect();
}
nsIFrame* mFrame;
gfxContext* mSourceCtx;
RefPtr<gfxContext> mTargetCtx;
IntPoint mTargetOffset;
};
void
nsSVGUtils::PaintFrameWithEffects(nsIFrame *aFrame,
gfxContext& aContext,
const gfxMatrix& aTransform,
imgDrawingParams& aImgParams,
const nsIntRect *aDirtyRect)
{
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY) ||
aFrame->PresContext()->IsGlyph(),
"If display lists are enabled, only painting of non-display "
"SVG should take this code path");
nsSVGDisplayableFrame* svgFrame = do_QueryFrame(aFrame);
if (!svgFrame)
return;
MaskUsage maskUsage;
DetermineMaskUsage(aFrame, true, maskUsage);
if (maskUsage.opacity == 0.0f) {
return;
}
const nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return;
}
if (aDirtyRect &&
!(aFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY)) {
// Here we convert aFrame's paint bounds to outer-<svg> device space,
// compare it to aDirtyRect, and return early if they don't intersect.
// We don't do this optimization for nondisplay SVG since nondisplay
// SVG doesn't maintain bounds/overflow rects.
nsRect overflowRect = aFrame->GetVisualOverflowRectRelativeToSelf();
if (aFrame->IsFrameOfType(nsIFrame::eSVGGeometry) ||
nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
// Unlike containers, leaf frames do not include GetPosition() in
// GetCanvasTM().
overflowRect = overflowRect + aFrame->GetPosition();
}
int32_t appUnitsPerDevPx = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxMatrix tm = aTransform;
if (aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer)) {
gfx::Matrix childrenOnlyTM;
if (static_cast<nsSVGContainerFrame*>(aFrame)->
HasChildrenOnlyTransform(&childrenOnlyTM)) {
// Undo the children-only transform:
if (!childrenOnlyTM.Invert()) {
return;
}
tm = ThebesMatrix(childrenOnlyTM) * tm;
}
}
nsIntRect bounds = TransformFrameRectToOuterSVG(overflowRect,
tm, aFrame->PresContext()).
ToOutsidePixels(appUnitsPerDevPx);
if (!aDirtyRect->Intersects(bounds)) {
return;
}
}
/* SVG defines the following rendering model:
*
* 1. Render fill
* 2. Render stroke
* 3. Render markers
* 4. Apply filter
* 5. Apply clipping, masking, group opacity
*
* We follow this, but perform a couple of optimizations:
*
* + Use cairo's clipPath when representable natively (single object
* clip region).
*f
* + Merge opacity and masking if both used together.
*/
/* Properties are added lazily and may have been removed by a restyle,
so make sure all applicable ones are set again. */
SVGObserverUtils::EffectProperties effectProperties =
SVGObserverUtils::GetEffectProperties(aFrame);
if (effectProperties.HasInvalidEffects()) {
// Some resource is invalid. We shouldn't paint anything.
return;
}
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame();
nsTArray<nsSVGMaskFrame*> masks = effectProperties.GetMaskFrames();
nsSVGMaskFrame *maskFrame = masks.IsEmpty() ? nullptr : masks[0];
MixModeBlender blender(aFrame, &aContext);
gfxContext* target = blender.ShouldCreateDrawTargetForBlend()
? blender.CreateBlendTarget(aTransform) : &aContext;
if (!target) {
return;
}
/* Check if we need to do additional operations on this child's
* rendering, which necessitates rendering into another surface. */
bool shouldGenerateMask = (maskUsage.opacity != 1.0f ||
maskUsage.shouldGenerateClipMaskLayer ||
maskUsage.shouldGenerateMaskLayer);
bool shouldPushMask = false;
if (shouldGenerateMask) {
Matrix maskTransform;
RefPtr<SourceSurface> maskSurface;
// maskFrame can be nullptr even if maskUsage.shouldGenerateMaskLayer is
// true. That happens when a user gives an unresolvable mask-id, such as
// mask:url()
// mask:url(#id-which-does-not-exist)
// Since we only uses nsSVGUtils with SVG elements, not like mask on an
// HTML element, we should treat an unresolvable mask as no-mask here.
if (maskUsage.shouldGenerateMaskLayer && maskFrame) {
uint8_t maskMode =
aFrame->StyleSVGReset()->mMask.mLayers[0].mMaskMode;
nsSVGMaskFrame::MaskParams params(&aContext, aFrame, aTransform,
maskUsage.opacity, &maskTransform,
maskMode, aImgParams);
maskSurface = maskFrame->GetMaskForMaskedFrame(params);
if (!maskSurface) {
// Either entire surface is clipped out, or gfx buffer allocation
// failure in nsSVGMaskFrame::GetMaskForMaskedFrame.
return;
}
shouldPushMask = true;
}
if (maskUsage.shouldGenerateClipMaskLayer) {
Matrix clippedMaskTransform;
RefPtr<SourceSurface> clipMaskSurface =
clipPathFrame->GetClipMask(aContext, aFrame, aTransform,
&clippedMaskTransform, maskSurface,
maskTransform);
if (clipMaskSurface) {
maskSurface = clipMaskSurface;
maskTransform = clippedMaskTransform;
} else {
// Either entire surface is clipped out, or gfx buffer allocation
// failure in nsSVGClipPathFrame::GetClipMask.
return;
}
shouldPushMask = true;
}
if (!maskUsage.shouldGenerateClipMaskLayer &&
!maskUsage.shouldGenerateMaskLayer) {
shouldPushMask = true;
}
// SVG mask multiply opacity into maskSurface already, so we do not bother
// to apply opacity again.
if (shouldPushMask) {
target->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA,
maskFrame ? 1.0 : maskUsage.opacity,
maskSurface, maskTransform);
}
}
/* If this frame has only a trivial clipPath, set up cairo's clipping now so
* we can just do normal painting and get it clipped appropriately.
*/
if (maskUsage.shouldApplyClipPath || maskUsage.shouldApplyBasicShape) {
if (maskUsage.shouldApplyClipPath) {
clipPathFrame->ApplyClipPath(aContext, aFrame, aTransform);
} else {
nsCSSClipPathInstance::ApplyBasicShapeClip(aContext, aFrame);
}
}
/* Paint the child */
if (effectProperties.HasValidFilter()) {
nsRegion* dirtyRegion = nullptr;
nsRegion tmpDirtyRegion;
if (aDirtyRect) {
// aDirtyRect is in outer-<svg> device pixels, but the filter code needs
// it in frame space.
gfxMatrix userToDeviceSpace = aTransform;
if (userToDeviceSpace.IsSingular()) {
return;
}
gfxMatrix deviceToUserSpace = userToDeviceSpace;
deviceToUserSpace.Invert();
gfxRect dirtyBounds = deviceToUserSpace.TransformBounds(
gfxRect(aDirtyRect->x, aDirtyRect->y,
aDirtyRect->width, aDirtyRect->height));
tmpDirtyRegion =
nsLayoutUtils::RoundGfxRectToAppRect(
dirtyBounds, aFrame->PresContext()->AppUnitsPerCSSPixel()) -
aFrame->GetPosition();
dirtyRegion = &tmpDirtyRegion;
}
gfxContextMatrixAutoSaveRestore autoSR(target);
// 'target' is currently scaled such that its user space units are CSS
// pixels (SVG user space units). But PaintFilteredFrame expects it to be
// scaled in such a way that its user space units are device pixels. So we
// have to adjust the scale.
gfxMatrix reverseScaleMatrix = nsSVGUtils::GetCSSPxToDevPxMatrix(aFrame);
DebugOnly<bool> invertible = reverseScaleMatrix.Invert();
target->SetMatrixDouble(reverseScaleMatrix * aTransform *
target->CurrentMatrixDouble());
SVGPaintCallback paintCallback;
nsFilterInstance::PaintFilteredFrame(aFrame, target, &paintCallback,
dirtyRegion, aImgParams);
} else {
svgFrame->PaintSVG(*target, aTransform, aImgParams, aDirtyRect);
}
if (maskUsage.shouldApplyClipPath || maskUsage.shouldApplyBasicShape) {
aContext.PopClip();
}
if (shouldPushMask) {
target->PopGroupAndBlend();
}
if (blender.ShouldCreateDrawTargetForBlend()) {
MOZ_ASSERT(target != &aContext);
blender.BlendToTarget();
}
}
bool
nsSVGUtils::HitTestClip(nsIFrame *aFrame, const gfxPoint &aPoint)
{
SVGObserverUtils::EffectProperties props =
SVGObserverUtils::GetEffectProperties(aFrame);
if (!props.mClipPath) {
const nsStyleSVGReset *style = aFrame->StyleSVGReset();
if (style->HasClipPath()) {
return nsCSSClipPathInstance::HitTestBasicShapeClip(aFrame, aPoint);
}
return true;
}
if (props.HasInvalidClipPath()) {
// clipPath is not a valid resource, so nothing gets painted, so
// hit-testing must fail.
return false;
}
nsSVGClipPathFrame *clipPathFrame = props.GetClipPathFrame();
if (!clipPathFrame) {
// clipPath doesn't exist, ignore it.
return true;
}
return clipPathFrame->PointIsInsideClipPath(aFrame, aPoint);
}
nsIFrame *
nsSVGUtils::HitTestChildren(nsSVGDisplayContainerFrame* aFrame,
const gfxPoint& aPoint)
{
// First we transform aPoint into the coordinate space established by aFrame
// for its children (e.g. take account of any 'viewBox' attribute):
gfxPoint point = aPoint;
if (aFrame->GetContent()->IsSVGElement()) { // must check before cast
gfxMatrix m = static_cast<const nsSVGElement*>(aFrame->GetContent())->
PrependLocalTransformsTo(gfxMatrix(),
eChildToUserSpace);
if (!m.IsIdentity()) {
if (!m.Invert()) {
return nullptr;
}
point = m.TransformPoint(point);
}
}
// Traverse the list in reverse order, so that if we get a hit we know that's
// the topmost frame that intersects the point; then we can just return it.
nsIFrame* result = nullptr;
for (nsIFrame* current = aFrame->PrincipalChildList().LastChild();
current;
current = current->GetPrevSibling()) {
nsSVGDisplayableFrame* SVGFrame = do_QueryFrame(current);
if (SVGFrame) {
const nsIContent* content = current->GetContent();
if (content->IsSVGElement() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
continue;
}
// GetFrameForPoint() expects a point in its frame's SVG user space, so
// we need to convert to that space:
gfxPoint p = point;
if (content->IsSVGElement()) { // must check before cast
gfxMatrix m = static_cast<const nsSVGElement*>(content)->
PrependLocalTransformsTo(gfxMatrix(),
eUserSpaceToParent);
if (!m.IsIdentity()) {
if (!m.Invert()) {
continue;
}
p = m.TransformPoint(p);
}
}
result = SVGFrame->GetFrameForPoint(p);
if (result)
break;
}
}
if (result && !HitTestClip(aFrame, aPoint))
result = nullptr;
return result;
}
nsRect
nsSVGUtils::TransformFrameRectToOuterSVG(const nsRect& aRect,
const gfxMatrix& aMatrix,
nsPresContext* aPresContext)
{
gfxRect r(aRect.x, aRect.y, aRect.width, aRect.height);
r.Scale(1.0 / nsPresContext::AppUnitsPerCSSPixel());
return nsLayoutUtils::RoundGfxRectToAppRect(
aMatrix.TransformBounds(r), aPresContext->AppUnitsPerDevPixel());
}
IntSize
nsSVGUtils::ConvertToSurfaceSize(const gfxSize& aSize,
bool *aResultOverflows)
{
IntSize surfaceSize(ClampToInt(ceil(aSize.width)), ClampToInt(ceil(aSize.height)));
*aResultOverflows = surfaceSize.width != ceil(aSize.width) ||
surfaceSize.height != ceil(aSize.height);
if (!Factory::AllowedSurfaceSize(surfaceSize)) {
surfaceSize.width = std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION,
surfaceSize.width);
surfaceSize.height = std::min(NS_SVG_OFFSCREEN_MAX_DIMENSION,
surfaceSize.height);
*aResultOverflows = true;
}
return surfaceSize;
}
bool
nsSVGUtils::HitTestRect(const gfx::Matrix &aMatrix,
float aRX, float aRY, float aRWidth, float aRHeight,
float aX, float aY)
{
gfx::Rect rect(aRX, aRY, aRWidth, aRHeight);
if (rect.IsEmpty() || aMatrix.IsSingular()) {
return false;
}
gfx::Matrix toRectSpace = aMatrix;
toRectSpace.Invert();
gfx::Point p = toRectSpace.TransformPoint(gfx::Point(aX, aY));
return rect.x <= p.x && p.x <= rect.XMost() &&
rect.y <= p.y && p.y <= rect.YMost();
}
gfxRect
nsSVGUtils::GetClipRectForFrame(nsIFrame *aFrame,
float aX, float aY, float aWidth, float aHeight)
{
const nsStyleDisplay* disp = aFrame->StyleDisplay();
const nsStyleEffects* effects = aFrame->StyleEffects();
if (!(effects->mClipFlags & NS_STYLE_CLIP_RECT)) {
NS_ASSERTION(effects->mClipFlags == NS_STYLE_CLIP_AUTO,
"We don't know about this type of clip.");
return gfxRect(aX, aY, aWidth, aHeight);
}
if (disp->mOverflowX == NS_STYLE_OVERFLOW_HIDDEN ||
disp->mOverflowY == NS_STYLE_OVERFLOW_HIDDEN) {
nsIntRect clipPxRect =
effects->mClip.ToOutsidePixels(aFrame->PresContext()->AppUnitsPerDevPixel());
gfxRect clipRect =
gfxRect(clipPxRect.x, clipPxRect.y, clipPxRect.width, clipPxRect.height);
if (NS_STYLE_CLIP_RIGHT_AUTO & effects->mClipFlags) {
clipRect.width = aWidth - clipRect.X();
}
if (NS_STYLE_CLIP_BOTTOM_AUTO & effects->mClipFlags) {
clipRect.height = aHeight - clipRect.Y();
}
if (disp->mOverflowX != NS_STYLE_OVERFLOW_HIDDEN) {
clipRect.x = aX;
clipRect.width = aWidth;
}
if (disp->mOverflowY != NS_STYLE_OVERFLOW_HIDDEN) {
clipRect.y = aY;
clipRect.height = aHeight;
}
return clipRect;
}
return gfxRect(aX, aY, aWidth, aHeight);
}
void
nsSVGUtils::SetClipRect(gfxContext *aContext,
const gfxMatrix &aCTM,
const gfxRect &aRect)
{
if (aCTM.IsSingular())
return;
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(aContext);
aContext->Multiply(aCTM);
aContext->Clip(aRect);
}
gfxRect
nsSVGUtils::GetBBox(nsIFrame* aFrame, uint32_t aFlags,
const gfxMatrix* aToBoundsSpace)
{
if (aFrame->GetContent()->IsNodeOfType(nsINode::eTEXT)) {
aFrame = aFrame->GetParent();
}
if (nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
// It is possible to apply a gradient, pattern, clipping path, mask or
// filter to text. When one of these facilities is applied to text
// the bounding box is the entire text element in all
// cases.
nsIFrame* ancestor = GetFirstNonAAncestorFrame(aFrame);
if (ancestor && nsSVGUtils::IsInSVGTextSubtree(ancestor)) {
while (!ancestor->IsSVGTextFrame()) {
ancestor = ancestor->GetParent();
}
}
aFrame = ancestor;
}
nsSVGDisplayableFrame* svg = do_QueryFrame(aFrame);
const bool hasSVGLayout = aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT;
if (hasSVGLayout && !svg) {
// An SVG frame, but not one that can be displayed directly (for
// example, nsGradientFrame). These can't contribute to the bbox.
return gfxRect();
}
const bool isOuterSVG = svg && !hasSVGLayout;
MOZ_ASSERT(!isOuterSVG || aFrame->IsSVGOuterSVGFrame());
if (!svg ||
(isOuterSVG && (aFlags & eUseFrameBoundsForOuterSVG))) {
// An HTML element or an SVG outer frame.
MOZ_ASSERT(!hasSVGLayout);
bool onlyCurrentFrame = aFlags & eIncludeOnlyCurrentFrameForNonSVGElement;
return nsSVGIntegrationUtils::GetSVGBBoxForNonSVGFrame(
aFrame,
/* aUnionContinuations = */ !onlyCurrentFrame);
}
MOZ_ASSERT(svg);
nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement() &&
!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return gfxRect();
}
// Clean out flags which have no effects on returning bbox from now, so that
// we can cache and reuse ObjectBoundingBoxProperty() in the code below.
aFlags &= ~eIncludeOnlyCurrentFrameForNonSVGElement;
aFlags &= ~eUseFrameBoundsForOuterSVG;
if (!aFrame->IsSVGUseFrame()) {
aFlags &= ~eUseUserSpaceOfUseElement;
}
if (aFlags == eBBoxIncludeFillGeometry &&
// We only cache bbox in element's own user space
!aToBoundsSpace) {
gfxRect* prop = aFrame->GetProperty(ObjectBoundingBoxProperty());
if (prop) {
return *prop;
}
}
gfxMatrix matrix;
if (aToBoundsSpace) {
matrix = *aToBoundsSpace;
}
if (aFrame->IsSVGForeignObjectFrame() ||
aFlags & nsSVGUtils::eUseUserSpaceOfUseElement) {
// The spec says getBBox "Returns the tight bounding box in *current user
// space*". So we should really be doing this for all elements, but that
// needs investigation to check that we won't break too much content.
// NOTE: When changing this to apply to other frame types, make sure to
// also update nsSVGUtils::FrameSpaceInCSSPxToUserSpaceOffset.
MOZ_ASSERT(content->IsSVGElement(), "bad cast");
nsSVGElement *element = static_cast<nsSVGElement*>(content);
matrix = element->PrependLocalTransformsTo(matrix, eChildToUserSpace);
}
gfxRect bbox =
svg->GetBBoxContribution(ToMatrix(matrix), aFlags).ToThebesRect();
// Account for 'clipped'.
if (aFlags & nsSVGUtils::eBBoxIncludeClipped) {
gfxRect clipRect(0, 0, 0, 0);
float x, y, width, height;
gfxMatrix tm;
gfxRect fillBBox =
svg->GetBBoxContribution(ToMatrix(tm),
nsSVGUtils::eBBoxIncludeFill).ToThebesRect();
x = fillBBox.x;
y = fillBBox.y;
width = fillBBox.width;
height = fillBBox.height;
bool hasClip = aFrame->StyleDisplay()->IsScrollableOverflow();
if (hasClip) {
clipRect =
nsSVGUtils::GetClipRectForFrame(aFrame, x, y, width, height);
if (aFrame->IsSVGForeignObjectFrame() || aFrame->IsSVGUseFrame()) {
clipRect = matrix.TransformBounds(clipRect);
}
}
SVGObserverUtils::EffectProperties effectProperties =
SVGObserverUtils::GetEffectProperties(aFrame);
if (effectProperties.HasInvalidClipPath()) {
bbox = gfxRect(0, 0, 0, 0);
} else {
nsSVGClipPathFrame *clipPathFrame =
effectProperties.GetClipPathFrame();
if (clipPathFrame) {
SVGClipPathElement *clipContent =
static_cast<SVGClipPathElement*>(clipPathFrame->GetContent());
RefPtr<SVGAnimatedEnumeration> units = clipContent->ClipPathUnits();
if (units->AnimVal() == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
matrix.PreTranslate(gfxPoint(x, y));
matrix.PreScale(width, height);
} else if (aFrame->IsSVGForeignObjectFrame()) {
matrix = gfxMatrix();
}
matrix = clipContent->PrependLocalTransformsTo(matrix, eUserSpaceToParent);
bbox =
clipPathFrame->GetBBoxForClipPathFrame(bbox, matrix).ToThebesRect();
}
if (hasClip) {
bbox = bbox.Intersect(clipRect);
}
if (bbox.IsEmpty()) {
bbox = gfxRect(0, 0, 0, 0);
}
}
}
if (aFlags == eBBoxIncludeFillGeometry &&
// We only cache bbox in element's own user space
!aToBoundsSpace) {
// Obtaining the bbox for objectBoundingBox calculations is common so we
// cache the result for future calls, since calculation can be expensive:
aFrame->SetProperty(ObjectBoundingBoxProperty(), new gfxRect(bbox));
}
return bbox;
}
gfxPoint
nsSVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(nsIFrame *aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
// The user space for non-SVG frames is defined as the bounding box of the
// frame's border-box rects over all continuations.
return gfxPoint();
}
// Leaf frames apply their own offset inside their user space.
if (aFrame->IsFrameOfType(nsIFrame::eSVGGeometry) ||
nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
return nsLayoutUtils::RectToGfxRect(aFrame->GetRect(),
nsPresContext::AppUnitsPerCSSPixel()).TopLeft();
}
// For foreignObject frames, nsSVGUtils::GetBBox applies their local
// transform, so we need to do the same here.
if (aFrame->IsSVGForeignObjectFrame()) {
gfxMatrix transform = static_cast<nsSVGElement*>(aFrame->GetContent())->
PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace);
NS_ASSERTION(!transform.HasNonTranslation(), "we're relying on this being an offset-only transform");
return transform.GetTranslation();
}
return gfxPoint();
}
static gfxRect
GetBoundingBoxRelativeRect(const nsSVGLength2 *aXYWH,
const gfxRect& aBBox)
{
return gfxRect(aBBox.x + nsSVGUtils::ObjectSpace(aBBox, &aXYWH[0]),
aBBox.y + nsSVGUtils::ObjectSpace(aBBox, &aXYWH[1]),
nsSVGUtils::ObjectSpace(aBBox, &aXYWH[2]),
nsSVGUtils::ObjectSpace(aBBox, &aXYWH[3]));
}
gfxRect
nsSVGUtils::GetRelativeRect(uint16_t aUnits, const nsSVGLength2 *aXYWH,
const gfxRect& aBBox,
const UserSpaceMetrics& aMetrics)
{
if (aUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
return GetBoundingBoxRelativeRect(aXYWH, aBBox);
}
return gfxRect(UserSpace(aMetrics, &aXYWH[0]),
UserSpace(aMetrics, &aXYWH[1]),
UserSpace(aMetrics, &aXYWH[2]),
UserSpace(aMetrics, &aXYWH[3]));
}
gfxRect
nsSVGUtils::GetRelativeRect(uint16_t aUnits, const nsSVGLength2 *aXYWH,
const gfxRect& aBBox, nsIFrame *aFrame)
{
if (aUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
return GetBoundingBoxRelativeRect(aXYWH, aBBox);
}
nsIContent* content = aFrame->GetContent();
if (content->IsSVGElement()) {
nsSVGElement* svgElement = static_cast<nsSVGElement*>(content);
return GetRelativeRect(aUnits, aXYWH, aBBox, SVGElementMetrics(svgElement));
}
return GetRelativeRect(aUnits, aXYWH, aBBox, NonSVGFrameUserSpaceMetrics(aFrame));
}
bool
nsSVGUtils::CanOptimizeOpacity(nsIFrame *aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
return false;
}
LayoutFrameType type = aFrame->Type();
if (type != LayoutFrameType::SVGImage &&
type != LayoutFrameType::SVGGeometry) {
return false;
}
if (aFrame->StyleEffects()->HasFilters()) {
return false;
}
// XXX The SVG WG is intending to allow fill, stroke and markers on <image>
if (type == LayoutFrameType::SVGImage) {
return true;
}
const nsStyleSVG *style = aFrame->StyleSVG();
if (style->HasMarker()) {
return false;
}
if (nsLayoutUtils::HasAnimationOfProperty(aFrame, eCSSProperty_opacity)) {
return false;
}
if (!style->HasFill() || !HasStroke(aFrame)) {
return true;
}
return false;
}
gfxMatrix
nsSVGUtils::AdjustMatrixForUnits(const gfxMatrix &aMatrix,
nsSVGEnum *aUnits,
nsIFrame *aFrame,
uint32_t aFlags)
{
if (aFrame &&
aUnits->GetAnimValue() == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
gfxRect bbox = GetBBox(aFrame, aFlags);
gfxMatrix tm = aMatrix;
tm.PreTranslate(gfxPoint(bbox.X(), bbox.Y()));
tm.PreScale(bbox.Width(), bbox.Height());
return tm;
}
return aMatrix;
}
nsIFrame*
nsSVGUtils::GetFirstNonAAncestorFrame(nsIFrame* aStartFrame)
{
for (nsIFrame *ancestorFrame = aStartFrame; ancestorFrame;
ancestorFrame = ancestorFrame->GetParent()) {
if (!ancestorFrame->IsSVGAFrame()) {
return ancestorFrame;
}
}
return nullptr;
}
bool
nsSVGUtils::GetNonScalingStrokeTransform(nsIFrame *aFrame,
gfxMatrix* aUserToOuterSVG)
{
if (aFrame->GetContent()->IsNodeOfType(nsINode::eTEXT)) {
aFrame = aFrame->GetParent();
}
if (!aFrame->StyleSVGReset()->HasNonScalingStroke()) {
return false;
}
nsIContent *content = aFrame->GetContent();
MOZ_ASSERT(content->IsSVGElement(), "bad cast");
*aUserToOuterSVG = ThebesMatrix(SVGContentUtils::GetCTM(
static_cast<nsSVGElement*>(content), true));
return !aUserToOuterSVG->IsIdentity();
}
// The logic here comes from _cairo_stroke_style_max_distance_from_path
static gfxRect
PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsIFrame* aFrame,
double aStyleExpansionFactor,
const gfxMatrix& aMatrix)
{
double style_expansion =
aStyleExpansionFactor * nsSVGUtils::GetStrokeWidth(aFrame);
gfxMatrix matrix = aMatrix;
gfxMatrix outerSVGToUser;
if (nsSVGUtils::GetNonScalingStrokeTransform(aFrame, &outerSVGToUser)) {
outerSVGToUser.Invert();
matrix.PreMultiply(outerSVGToUser);
}
double dx = style_expansion * (fabs(matrix._11) + fabs(matrix._21));
double dy = style_expansion * (fabs(matrix._22) + fabs(matrix._12));
gfxRect strokeExtents = aPathExtents;
strokeExtents.Inflate(dx, dy);
return strokeExtents;
}
/*static*/ gfxRect
nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
nsTextFrame* aFrame,
const gfxMatrix& aMatrix)
{
NS_ASSERTION(nsSVGUtils::IsInSVGTextSubtree(aFrame),
"expected an nsTextFrame for SVG text");
return ::PathExtentsToMaxStrokeExtents(aPathExtents, aFrame, 0.5, aMatrix);
}
/*static*/ gfxRect
nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
SVGGeometryFrame* aFrame,
const gfxMatrix& aMatrix)
{
bool strokeMayHaveCorners =
!SVGContentUtils::ShapeTypeHasNoCorners(aFrame->GetContent());
// For a shape without corners the stroke can only extend half the stroke
// width from the path in the x/y-axis directions. For shapes with corners
// the stroke can extend by sqrt(1/2) (think 45 degree rotated rect, or line
// with stroke-linecaps="square").
double styleExpansionFactor = strokeMayHaveCorners ? M_SQRT1_2 : 0.5;
// The stroke can extend even further for paths that can be affected by
// stroke-miterlimit.
bool affectedByMiterlimit =
aFrame->GetContent()->IsAnyOfSVGElements(nsGkAtoms::path,
nsGkAtoms::polyline,
nsGkAtoms::polygon);
if (affectedByMiterlimit) {
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mStrokeLinejoin == NS_STYLE_STROKE_LINEJOIN_MITER &&
styleExpansionFactor < style->mStrokeMiterlimit / 2.0) {
styleExpansionFactor = style->mStrokeMiterlimit / 2.0;
}
}
return ::PathExtentsToMaxStrokeExtents(aPathExtents,
aFrame,
styleExpansionFactor,
aMatrix);
}
// ----------------------------------------------------------------------
/* static */ nscolor
nsSVGUtils::GetFallbackOrPaintColor(nsStyleContext *aStyleContext,
nsStyleSVGPaint nsStyleSVG::*aFillOrStroke)
{
const nsStyleSVGPaint &paint = aStyleContext->StyleSVG()->*aFillOrStroke;
nsStyleContext *styleIfVisited = aStyleContext->GetStyleIfVisited();
nscolor color;
switch (paint.Type()) {
case eStyleSVGPaintType_Server:
case eStyleSVGPaintType_ContextStroke:
color = paint.GetFallbackType() == eStyleSVGFallbackType_Color ?
paint.GetFallbackColor() : NS_RGBA(0, 0, 0, 0);
break;
case eStyleSVGPaintType_ContextFill:
color = paint.GetFallbackType() == eStyleSVGFallbackType_Color ?
paint.GetFallbackColor() : NS_RGB(0, 0, 0);
break;
default:
color = paint.GetColor();
break;
}
if (styleIfVisited) {
const nsStyleSVGPaint &paintIfVisited =
styleIfVisited->StyleSVG()->*aFillOrStroke;
// To prevent Web content from detecting if a user has visited a URL
// (via URL loading triggered by paint servers or performance
// differences between paint servers or between a paint server and a
// color), we do not allow whether links are visited to change which
// paint server is used or switch between paint servers and simple
// colors. A :visited style may only override a simple color with
// another simple color.
if (paintIfVisited.Type() == eStyleSVGPaintType_Color &&
paint.Type() == eStyleSVGPaintType_Color) {
nscolor colors[2] = { color, paintIfVisited.GetColor() };
return nsStyleContext::CombineVisitedColors(
colors, aStyleContext->RelevantLinkVisited());
}
}
return color;
}
/* static */ void
nsSVGUtils::MakeFillPatternFor(nsIFrame* aFrame,
gfxContext* aContext,
GeneralPattern* aOutPattern,
imgDrawingParams& aImgParams,
SVGContextPaint* aContextPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mFill.Type() == eStyleSVGPaintType_None) {
return;
}
const float opacity = aFrame->StyleEffects()->mOpacity;
float fillOpacity = GetOpacity(style->FillOpacitySource(),
style->mFillOpacity,
aContextPaint);
if (opacity < 1.0f &&
nsSVGUtils::CanOptimizeOpacity(aFrame)) {
// Combine the group opacity into the fill opacity (we will have skipped
// creating an offscreen surface to apply the group opacity).
fillOpacity *= opacity;
}
const DrawTarget* dt = aContext->GetDrawTarget();
nsSVGPaintServerFrame *ps =
SVGObserverUtils::GetPaintServer(aFrame, &nsStyleSVG::mFill,
SVGObserverUtils::FillProperty());
if (ps) {
RefPtr<gfxPattern> pattern =
ps->GetPaintServerPattern(aFrame, dt, aContext->CurrentMatrixDouble(),
&nsStyleSVG::mFill, fillOpacity, aImgParams);
if (pattern) {
pattern->CacheColorStops(dt);
aOutPattern->Init(*pattern->GetPattern(dt));
return;
}
}
if (aContextPaint) {
RefPtr<gfxPattern> pattern;
switch (style->mFill.Type()) {
case eStyleSVGPaintType_ContextFill:
pattern =
aContextPaint->GetFillPattern(dt, fillOpacity,
aContext->CurrentMatrixDouble(), aImgParams);
break;
case eStyleSVGPaintType_ContextStroke:
pattern =
aContextPaint->GetStrokePattern(dt, fillOpacity,
aContext->CurrentMatrixDouble(), aImgParams);
break;
default:
;
}
if (pattern) {
aOutPattern->Init(*pattern->GetPattern(dt));
return;
}
}
if (style->mFill.GetFallbackType() == eStyleSVGFallbackType_None) {
return;
}
// On failure, use the fallback colour in case we have an
// objectBoundingBox where the width or height of the object is zero.
// See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox
Color color(Color::FromABGR(GetFallbackOrPaintColor(aFrame->StyleContext(),
&nsStyleSVG::mFill)));
color.a *= fillOpacity;
aOutPattern->InitColorPattern(ToDeviceColor(color));
}
/* static */ void
nsSVGUtils::MakeStrokePatternFor(nsIFrame* aFrame,
gfxContext* aContext,
GeneralPattern* aOutPattern,
imgDrawingParams& aImgParams,
SVGContextPaint* aContextPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
if (style->mStroke.Type() == eStyleSVGPaintType_None) {
return;
}
const float opacity = aFrame->StyleEffects()->mOpacity;
float strokeOpacity = GetOpacity(style->StrokeOpacitySource(),
style->mStrokeOpacity,
aContextPaint);
if (opacity < 1.0f &&
nsSVGUtils::CanOptimizeOpacity(aFrame)) {
// Combine the group opacity into the stroke opacity (we will have skipped
// creating an offscreen surface to apply the group opacity).
strokeOpacity *= opacity;
}
const DrawTarget* dt = aContext->GetDrawTarget();
nsSVGPaintServerFrame *ps =
SVGObserverUtils::GetPaintServer(aFrame, &nsStyleSVG::mStroke,
SVGObserverUtils::StrokeProperty());
if (ps) {
RefPtr<gfxPattern> pattern =
ps->GetPaintServerPattern(aFrame, dt, aContext->CurrentMatrixDouble(),
&nsStyleSVG::mStroke, strokeOpacity, aImgParams);
if (pattern) {
pattern->CacheColorStops(dt);
aOutPattern->Init(*pattern->GetPattern(dt));
return;
}
}
if (aContextPaint) {
RefPtr<gfxPattern> pattern;
switch (style->mStroke.Type()) {
case eStyleSVGPaintType_ContextFill:
pattern =
aContextPaint->GetFillPattern(dt, strokeOpacity,
aContext->CurrentMatrixDouble(), aImgParams);
break;
case eStyleSVGPaintType_ContextStroke:
pattern =
aContextPaint->GetStrokePattern(dt, strokeOpacity,
aContext->CurrentMatrixDouble(), aImgParams);
break;
default:
;
}
if (pattern) {
aOutPattern->Init(*pattern->GetPattern(dt));
return;
}
}
if (style->mStroke.GetFallbackType() == eStyleSVGFallbackType_None) {
return;
}
// On failure, use the fallback colour in case we have an
// objectBoundingBox where the width or height of the object is zero.
// See http://www.w3.org/TR/SVG11/coords.html#ObjectBoundingBox
Color color(Color::FromABGR(GetFallbackOrPaintColor(aFrame->StyleContext(),
&nsStyleSVG::mStroke)));
color.a *= strokeOpacity;
aOutPattern->InitColorPattern(ToDeviceColor(color));
}
/* static */ float
nsSVGUtils::GetOpacity(nsStyleSVGOpacitySource aOpacityType,
const float& aOpacity,
SVGContextPaint *aContextPaint)
{
float opacity = 1.0f;
switch (aOpacityType) {
case eStyleSVGOpacitySource_Normal:
opacity = aOpacity;
break;
case eStyleSVGOpacitySource_ContextFillOpacity:
if (aContextPaint) {
opacity = aContextPaint->GetFillOpacity();
} else {
NS_WARNING("Content used context-fill-opacity when not in a context element");
}
break;
case eStyleSVGOpacitySource_ContextStrokeOpacity:
if (aContextPaint) {
opacity = aContextPaint->GetStrokeOpacity();
} else {
NS_WARNING("Content used context-stroke-opacity when not in a context element");
}
break;
default:
NS_NOTREACHED("Unknown object opacity inheritance type for SVG glyph");
}
return opacity;
}
bool
nsSVGUtils::HasStroke(nsIFrame* aFrame, SVGContextPaint* aContextPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
return style->HasStroke() && GetStrokeWidth(aFrame, aContextPaint) > 0;
}
float
nsSVGUtils::GetStrokeWidth(nsIFrame* aFrame, SVGContextPaint* aContextPaint)
{
const nsStyleSVG *style = aFrame->StyleSVG();
if (aContextPaint && style->StrokeWidthFromObject()) {
return aContextPaint->GetStrokeWidth();
}
nsIContent* content = aFrame->GetContent();
if (content->IsNodeOfType(nsINode::eTEXT)) {
content = content->GetParent();
}
nsSVGElement *ctx = static_cast<nsSVGElement*>(content);
return SVGContentUtils::CoordToFloat(ctx, style->mStrokeWidth);
}
static bool
GetStrokeDashData(nsIFrame* aFrame,
nsTArray<gfxFloat>& aDashes,
gfxFloat* aDashOffset,
SVGContextPaint* aContextPaint)
{
const nsStyleSVG* style = aFrame->StyleSVG();
nsIContent *content = aFrame->GetContent();
nsSVGElement *ctx = static_cast<nsSVGElement*>
(content->IsNodeOfType(nsINode::eTEXT) ?
content->GetParent() : content);
gfxFloat totalLength = 0.0;
if (aContextPaint && style->StrokeDasharrayFromObject()) {
aDashes = aContextPaint->GetStrokeDashArray();
for (uint32_t i = 0; i < aDashes.Length(); i++) {
if (aDashes[i] < 0.0) {
return false;
}
totalLength += aDashes[i];
}
} else {
uint32_t count = style->mStrokeDasharray.Length();
if (!count || !aDashes.SetLength(count, fallible)) {
return false;
}
gfxFloat pathScale = 1.0;
if (content->IsSVGElement(nsGkAtoms::path)) {
pathScale = static_cast<SVGPathElement*>(content)->
GetPathLengthScale(SVGPathElement::eForStroking);
if (pathScale <= 0) {
return false;
}
}
const nsTArray<nsStyleCoord>& dasharray = style->mStrokeDasharray;
for (uint32_t i = 0; i < count; i++) {
aDashes[i] = SVGContentUtils::CoordToFloat(ctx,
dasharray[i]) * pathScale;
if (aDashes[i] < 0.0) {
return false;
}
totalLength += aDashes[i];
}
}
if (aContextPaint && style->StrokeDashoffsetFromObject()) {
*aDashOffset = aContextPaint->GetStrokeDashOffset();
} else {
*aDashOffset = SVGContentUtils::CoordToFloat(ctx,
style->mStrokeDashoffset);
}
return (totalLength > 0.0);
}
void
nsSVGUtils::SetupStrokeGeometry(nsIFrame* aFrame,
gfxContext *aContext,
SVGContextPaint* aContextPaint)
{
float width = GetStrokeWidth(aFrame, aContextPaint);
if (width <= 0)
return;
aContext->SetLineWidth(width);
const nsStyleSVG* style = aFrame->StyleSVG();
switch (style->mStrokeLinecap) {
case NS_STYLE_STROKE_LINECAP_BUTT:
aContext->SetLineCap(CapStyle::BUTT);
break;
case NS_STYLE_STROKE_LINECAP_ROUND:
aContext->SetLineCap(CapStyle::ROUND);
break;
case NS_STYLE_STROKE_LINECAP_SQUARE:
aContext->SetLineCap(CapStyle::SQUARE);
break;
}
aContext->SetMiterLimit(style->mStrokeMiterlimit);
switch (style->mStrokeLinejoin) {
case NS_STYLE_STROKE_LINEJOIN_MITER:
aContext->SetLineJoin(JoinStyle::MITER_OR_BEVEL);
break;
case NS_STYLE_STROKE_LINEJOIN_ROUND:
aContext->SetLineJoin(JoinStyle::ROUND);
break;
case NS_STYLE_STROKE_LINEJOIN_BEVEL:
aContext->SetLineJoin(JoinStyle::BEVEL);
break;
}
AutoTArray<gfxFloat, 10> dashes;
gfxFloat dashOffset;
if (GetStrokeDashData(aFrame, dashes, &dashOffset, aContextPaint)) {
aContext->SetDash(dashes.Elements(), dashes.Length(), dashOffset);
}
}
uint16_t
nsSVGUtils::GetGeometryHitTestFlags(nsIFrame* aFrame)
{
uint16_t flags = 0;
switch (aFrame->StyleUserInterface()->mPointerEvents) {
case NS_STYLE_POINTER_EVENTS_NONE:
break;
case NS_STYLE_POINTER_EVENTS_AUTO:
case NS_STYLE_POINTER_EVENTS_VISIBLEPAINTED:
if (aFrame->StyleVisibility()->IsVisible()) {
if (aFrame->StyleSVG()->mFill.Type() != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_FILL;
if (aFrame->StyleSVG()->mStroke.Type() != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_STROKE;
if (aFrame->StyleSVG()->mStrokeOpacity > 0)
flags |= SVG_HIT_TEST_CHECK_MRECT;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLEFILL:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_FILL;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLESTROKE:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_STROKE;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLE:
if (aFrame->StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE;
}
break;
case NS_STYLE_POINTER_EVENTS_PAINTED:
if (aFrame->StyleSVG()->mFill.Type() != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_FILL;
if (aFrame->StyleSVG()->mStroke.Type() != eStyleSVGPaintType_None)
flags |= SVG_HIT_TEST_STROKE;
if (aFrame->StyleSVG()->mStrokeOpacity)
flags |= SVG_HIT_TEST_CHECK_MRECT;
break;
case NS_STYLE_POINTER_EVENTS_FILL:
flags |= SVG_HIT_TEST_FILL;
break;
case NS_STYLE_POINTER_EVENTS_STROKE:
flags |= SVG_HIT_TEST_STROKE;
break;
case NS_STYLE_POINTER_EVENTS_ALL:
flags |= SVG_HIT_TEST_FILL | SVG_HIT_TEST_STROKE;
break;
default:
NS_ERROR("not reached");
break;
}
return flags;
}
void
nsSVGUtils::PaintSVGGlyph(Element* aElement, gfxContext* aContext)
{
nsIFrame* frame = aElement->GetPrimaryFrame();
nsSVGDisplayableFrame* svgFrame = do_QueryFrame(frame);
if (!svgFrame) {
return;
}
gfxMatrix m;
if (frame->GetContent()->IsSVGElement()) {
// PaintSVG() expects the passed transform to be the transform to its own
// SVG user space, so we need to account for any 'transform' attribute:
m = static_cast<nsSVGElement*>(frame->GetContent())->
PrependLocalTransformsTo(gfxMatrix(), eUserSpaceToParent);
}
// SVG-in-OpenType is not allowed to paint exteral resources, so we can
// just pass a dummy params into PatintSVG.
imgDrawingParams dummy;
svgFrame->PaintSVG(*aContext, m, dummy);
}
bool
nsSVGUtils::GetSVGGlyphExtents(Element* aElement,
const gfxMatrix& aSVGToAppSpace,
gfxRect* aResult)
{
nsIFrame* frame = aElement->GetPrimaryFrame();
nsSVGDisplayableFrame* svgFrame = do_QueryFrame(frame);
if (!svgFrame) {
return false;
}
gfxMatrix transform(aSVGToAppSpace);
nsIContent* content = frame->GetContent();
if (content->IsSVGElement()) {
transform = static_cast<nsSVGElement*>(content)->
PrependLocalTransformsTo(aSVGToAppSpace);
}
*aResult = svgFrame->GetBBoxContribution(gfx::ToMatrix(transform),
nsSVGUtils::eBBoxIncludeFill | nsSVGUtils::eBBoxIncludeFillGeometry |
nsSVGUtils::eBBoxIncludeStroke | nsSVGUtils::eBBoxIncludeStrokeGeometry |
nsSVGUtils::eBBoxIncludeMarkers).ToThebesRect();
return true;
}
nsRect
nsSVGUtils::ToCanvasBounds(const gfxRect &aUserspaceRect,
const gfxMatrix &aToCanvas,
const nsPresContext *presContext)
{
return nsLayoutUtils::RoundGfxRectToAppRect(
aToCanvas.TransformBounds(aUserspaceRect),
presContext->AppUnitsPerDevPixel());
}
gfxMatrix
nsSVGUtils::GetCSSPxToDevPxMatrix(nsIFrame* aNonSVGFrame)
{
int32_t appUnitsPerDevPixel = aNonSVGFrame->PresContext()->AppUnitsPerDevPixel();
float devPxPerCSSPx =
1 / nsPresContext::AppUnitsToFloatCSSPixels(appUnitsPerDevPixel);
return gfxMatrix(devPxPerCSSPx, 0.0,
0.0, devPxPerCSSPx,
0.0, 0.0);
}
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