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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 "SVGMaskFrame.h"
// Keep others in (case-insensitive) order:
#include "AutoReferenceChainGuard.h"
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "mozilla/PresShell.h"
#include "mozilla/RefPtr.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/SVGMaskElement.h"
#include "mozilla/dom/SVGUnitTypesBinding.h"
#include "mozilla/gfx/2D.h"
using namespace mozilla::dom;
using namespace mozilla::dom::SVGUnitTypes_Binding;
using namespace mozilla::gfx;
using namespace mozilla::image;
nsIFrame* NS_NewSVGMaskFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGMaskFrame(aStyle, aPresShell->GetPresContext());
}
namespace mozilla {
NS_IMPL_FRAMEARENA_HELPERS(SVGMaskFrame)
already_AddRefed<SourceSurface> SVGMaskFrame::GetMaskForMaskedFrame(
MaskParams& aParams) {
// Make sure we break reference loops and over long reference chains:
static int16_t sRefChainLengthCounter = AutoReferenceChainGuard::noChain;
AutoReferenceChainGuard refChainGuard(this, &mInUse, &sRefChainLengthCounter);
if (MOZ_UNLIKELY(!refChainGuard.Reference())) {
// Break reference chain
return nullptr;
}
gfxRect maskArea = GetMaskArea(aParams.maskedFrame);
if (maskArea.IsEmpty()) {
return nullptr;
}
// Get the clip extents in device space:
// Minimizing the mask surface extents (using both the current clip extents
// and maskArea) is important for performance.
//
gfxRect maskSurfaceRectDouble = aParams.toUserSpace.TransformBounds(maskArea);
Rect maskSurfaceRect = ToRect(maskSurfaceRectDouble);
maskSurfaceRect.RoundOut();
StyleMaskType maskType;
if (aParams.maskMode == StyleMaskMode::MatchSource) {
maskType = StyleSVGReset()->mMaskType;
} else {
maskType = aParams.maskMode == StyleMaskMode::Luminance
? StyleMaskType::Luminance
: StyleMaskType::Alpha;
}
RefPtr<DrawTarget> maskDT;
if (maskType == StyleMaskType::Luminance) {
maskDT = aParams.dt->CreateClippedDrawTarget(maskSurfaceRect,
SurfaceFormat::B8G8R8A8);
} else {
maskDT =
aParams.dt->CreateClippedDrawTarget(maskSurfaceRect, SurfaceFormat::A8);
}
if (!maskDT || !maskDT->IsValid()) {
return nullptr;
}
gfxContext tmpCtx(maskDT, /* aPreserveTransform */ true);
mMatrixForChildren =
GetMaskTransform(aParams.maskedFrame) * aParams.toUserSpace;
for (auto* kid : mFrames) {
gfxMatrix m = mMatrixForChildren;
// The CTM of each frame referencing us can be different
ISVGDisplayableFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
SVGFrame->NotifySVGChanged(ISVGDisplayableFrame::TRANSFORM_CHANGED);
m = SVGUtils::GetTransformMatrixInUserSpace(kid) * m;
}
SVGUtils::PaintFrameWithEffects(kid, tmpCtx, m, aParams.imgParams);
}
RefPtr<SourceSurface> surface;
if (maskType == StyleMaskType::Luminance) {
auto luminanceType = LuminanceType::LUMINANCE;
if (StyleSVG()->mColorInterpolation == StyleColorInterpolation::Linearrgb) {
luminanceType = LuminanceType::LINEARRGB;
}
RefPtr<SourceSurface> maskSnapshot =
maskDT->IntoLuminanceSource(luminanceType, aParams.opacity);
if (!maskSnapshot) {
return nullptr;
}
surface = std::move(maskSnapshot);
} else {
maskDT->FillRect(maskSurfaceRect,
ColorPattern(DeviceColor::MaskWhite(aParams.opacity)),
DrawOptions(1, CompositionOp::OP_IN));
RefPtr<SourceSurface> maskSnapshot = maskDT->Snapshot();
if (!maskSnapshot) {
return nullptr;
}
surface = std::move(maskSnapshot);
}
return surface.forget();
}
gfxRect SVGMaskFrame::GetMaskArea(nsIFrame* aMaskedFrame) {
SVGMaskElement* maskElem = static_cast<SVGMaskElement*>(GetContent());
uint16_t units =
maskElem->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue();
gfxRect bbox;
if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
bbox =
SVGUtils::GetBBox(aMaskedFrame, SVGUtils::eUseFrameBoundsForOuterSVG |
SVGUtils::eBBoxIncludeFillGeometry);
}
// Bounds in the user space of aMaskedFrame
gfxRect maskArea = SVGUtils::GetRelativeRect(
units, &maskElem->mLengthAttributes[SVGMaskElement::ATTR_X], bbox,
aMaskedFrame);
return maskArea;
}
nsresult SVGMaskFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType) {
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::maskUnits ||
aAttribute == nsGkAtoms::maskContentUnits)) {
SVGObserverUtils::InvalidateRenderingObservers(this);
}
return SVGContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
}
#ifdef DEBUG
void SVGMaskFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::mask),
"Content is not an SVG mask");
SVGContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
gfxMatrix SVGMaskFrame::GetCanvasTM() { return mMatrixForChildren; }
gfxMatrix SVGMaskFrame::GetMaskTransform(nsIFrame* aMaskedFrame) {
SVGMaskElement* content = static_cast<SVGMaskElement*>(GetContent());
SVGAnimatedEnumeration* maskContentUnits =
&content->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS];
uint32_t flags = SVGUtils::eBBoxIncludeFillGeometry |
(aMaskedFrame->StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone
? SVGUtils::eIncludeOnlyCurrentFrameForNonSVGElement
: 0);
return SVGUtils::AdjustMatrixForUnits(gfxMatrix(), maskContentUnits,
aMaskedFrame, flags);
}
} // namespace mozilla