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/*
* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
* Copyright (C) 2021, 2022, 2023 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "RenderSVGResourceMasker.h"
#include "Element.h"
#include "ElementIterator.h"
#include "FloatPoint.h"
#include "Image.h"
#include "ImageBuffer.h"
#include "IntRect.h"
#include "RenderLayer.h"
#include "RenderLayerInlines.h"
#include "RenderSVGModelObjectInlines.h"
#include "RenderSVGResourceMaskerInlines.h"
#include "SVGContainerLayout.h"
#include "SVGElementTypeHelpers.h"
#include "SVGGraphicsElement.h"
#include "SVGLengthContext.h"
#include "SVGRenderStyle.h"
#include "SVGVisitedRendererTracking.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RenderSVGResourceMasker);
RenderSVGResourceMasker::RenderSVGResourceMasker(SVGMaskElement& element, RenderStyle&& style)
: RenderSVGResourceContainer(Type::SVGResourceMasker, element, WTFMove(style))
{
}
RenderSVGResourceMasker::~RenderSVGResourceMasker() = default;
static RefPtr<ImageBuffer> createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, const DestinationColorSpace& colorSpace, const GraphicsContext* context)
{
IntRect paintRect = enclosingIntRect(absoluteTransform.mapRect(targetRect));
// Don't create empty ImageBuffers.
if (paintRect.isEmpty())
return nullptr;
FloatSize scale;
FloatSize clampedSize = ImageBuffer::clampedSize(paintRect.size(), scale);
UNUSED_PARAM(context);
auto imageBuffer = ImageBuffer::create(clampedSize, RenderingMode::Unaccelerated, RenderingPurpose::Unspecified, 1, colorSpace, ImageBufferPixelFormat::BGRA8);
if (!imageBuffer)
return nullptr;
AffineTransform transform;
transform.scale(scale).translate(-paintRect.location()).multiply(absoluteTransform);
auto& imageContext = imageBuffer->context();
imageContext.concatCTM(transform);
return imageBuffer;
}
void RenderSVGResourceMasker::applyMask(PaintInfo& paintInfo, const RenderLayerModelObject& targetRenderer, const LayoutPoint& adjustedPaintOffset)
{
ASSERT(hasLayer());
ASSERT(layer()->isSelfPaintingLayer());
ASSERT(targetRenderer.hasLayer());
static NeverDestroyed<SVGVisitedRendererTracking::VisitedSet> s_visitedSet;
SVGVisitedRendererTracking recursionTracking(s_visitedSet);
if (recursionTracking.isVisiting(*this))
return;
SVGVisitedRendererTracking::Scope recursionScope(recursionTracking, *this);
auto& context = paintInfo.context();
GraphicsContextStateSaver stateSaver(context);
auto objectBoundingBox = targetRenderer.objectBoundingBox();
auto boundingBoxTopLeftCorner = flooredLayoutPoint(objectBoundingBox.minXMinYCorner());
auto coordinateSystemOriginTranslation = adjustedPaintOffset - boundingBoxTopLeftCorner;
if (!coordinateSystemOriginTranslation.isZero())
context.translate(coordinateSystemOriginTranslation);
// FIXME: This needs to be bounding box and should not use repaint rect.
// https://bugs.webkit.org/show_bug.cgi?id=278551
auto repaintBoundingBox = targetRenderer.repaintRectInLocalCoordinates(RepaintRectCalculation::Accurate);
auto absoluteTransform = context.getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
auto maskColorSpace = DestinationColorSpace::SRGB();
auto drawColorSpace = DestinationColorSpace::SRGB();
Ref svgStyle = style().svgStyle();
if (svgStyle->colorInterpolation() == ColorInterpolation::LinearRGB) {
#if USE(CG) || USE(SKIA)
maskColorSpace = DestinationColorSpace::LinearSRGB();
#endif
drawColorSpace = DestinationColorSpace::LinearSRGB();
}
RefPtr<ImageBuffer> maskImage = m_masker.get(targetRenderer);
bool missingMaskerData = !maskImage;
if (missingMaskerData) {
// FIXME: try to use GraphicsContext::createScaledImageBuffer instead.
maskImage = createImageBuffer(repaintBoundingBox, absoluteTransform, maskColorSpace, &context);
if (!maskImage)
return;
}
context.setCompositeOperation(CompositeOperator::DestinationIn);
context.beginTransparencyLayer(1);
if (missingMaskerData) {
drawContentIntoContext(maskImage->context(), objectBoundingBox);
#if !USE(CG) && !USE(SKIA)
maskImage->transformToColorSpace(drawColorSpace);
#else
UNUSED_PARAM(drawColorSpace);
#endif
if (svgStyle->maskType() == MaskType::Luminance)
maskImage->convertToLuminanceMask();
m_masker.set(targetRenderer, maskImage);
}
context.setCompositeOperation(CompositeOperator::SourceOver);
// The mask image has been created in the absolute coordinate space, as the image should not be scaled.
// So the actual masking process has to be done in the absolute coordinate space as well.
FloatRect absoluteTargetRect = enclosingIntRect(absoluteTransform.mapRect(repaintBoundingBox));
context.concatCTM(absoluteTransform.inverse().value_or(AffineTransform()));
context.drawImageBuffer(*maskImage, absoluteTargetRect);
context.endTransparencyLayer();
}
FloatRect RenderSVGResourceMasker::resourceBoundingBox(const RenderObject& object, RepaintRectCalculation repaintRectCalculation)
{
auto targetBoundingBox = object.objectBoundingBox();
static NeverDestroyed<SVGVisitedRendererTracking::VisitedSet> s_visitedSet;
SVGVisitedRendererTracking recursionTracking(s_visitedSet);
if (recursionTracking.isVisiting(*this))
return targetBoundingBox;
SVGVisitedRendererTracking::Scope recursionScope(recursionTracking, *this);
Ref maskElement = this->maskElement();
auto maskRect = maskElement->calculateMaskContentRepaintRect(repaintRectCalculation);
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform contentTransform;
contentTransform.translate(targetBoundingBox.location());
contentTransform.scale(targetBoundingBox.size());
maskRect = contentTransform.mapRect(maskRect);
}
auto maskBoundaries = SVGLengthContext::resolveRectangle<SVGMaskElement>(maskElement.ptr(), maskElement->maskUnits(), targetBoundingBox);
maskRect.intersect(maskBoundaries);
if (maskRect.isEmpty())
return targetBoundingBox;
return maskRect;
}
void RenderSVGResourceMasker::removeReferencingCSSClient(const RenderElement& client)
{
if (auto renderer = dynamicDowncast<RenderLayerModelObject>(client))
m_masker.remove(renderer);
}
bool RenderSVGResourceMasker::drawContentIntoContext(GraphicsContext& context, const FloatRect& objectBoundingBox)
{
// Eventually adjust the mask image context according to the target objectBoundingBox.
AffineTransform maskContentTransformation;
if (protectedMaskElement()->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
maskContentTransformation.translate(objectBoundingBox.location());
maskContentTransformation.scale(objectBoundingBox.size());
}
// Draw the content into the ImageBuffer.
checkedLayer()->paintSVGResourceLayer(context, maskContentTransformation);
return true;
}
bool RenderSVGResourceMasker::drawContentIntoContext(GraphicsContext& context, const FloatRect& destinationRect, const FloatRect& sourceRect, ImagePaintingOptions options)
{
GraphicsContextStateSaver stateSaver(context);
context.setCompositeOperation(options.compositeOperator(), options.blendMode());
context.translate(destinationRect.location());
if (destinationRect.size() != sourceRect.size())
context.scale(destinationRect.size() / sourceRect.size());
context.translate(-sourceRect.location());
return drawContentIntoContext(context, { { }, destinationRect.size() });
}
}
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