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/*
* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
* Copyright (C) 2022-2023 Apple Inc. All rights reserved.
*
* 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 "LegacyRenderSVGResourceMasker.h"
#include "Element.h"
#include "ElementChildIteratorInlines.h"
#include "FloatPoint.h"
#include "Image.h"
#include "IntRect.h"
#include "LegacyRenderSVGResourceMaskerInlines.h"
#include "SVGRenderStyle.h"
#include "SVGRenderingContext.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(LegacyRenderSVGResourceMasker);
LegacyRenderSVGResourceMasker::LegacyRenderSVGResourceMasker(SVGMaskElement& element, RenderStyle&& style)
: LegacyRenderSVGResourceContainer(Type::LegacySVGResourceMasker, element, WTFMove(style))
{
}
LegacyRenderSVGResourceMasker::~LegacyRenderSVGResourceMasker() = default;
void LegacyRenderSVGResourceMasker::removeAllClientsFromCacheIfNeeded(bool markForInvalidation, SingleThreadWeakHashSet<RenderObject>* visitedRenderers)
{
m_maskContentBoundaries.fill(FloatRect { });
m_masker.clear();
markAllClientsForInvalidationIfNeeded(markForInvalidation ? LayoutAndBoundariesInvalidation : ParentOnlyInvalidation, visitedRenderers);
}
void LegacyRenderSVGResourceMasker::removeClientFromCache(RenderElement& client, bool markForInvalidation)
{
m_masker.remove(client);
markClientForInvalidation(client, markForInvalidation ? BoundariesInvalidation : ParentOnlyInvalidation);
}
auto LegacyRenderSVGResourceMasker::applyResource(RenderElement& renderer, const RenderStyle&, GraphicsContext*& context, OptionSet<RenderSVGResourceMode> resourceMode) -> OptionSet<ApplyResult>
{
ASSERT(context);
ASSERT_UNUSED(resourceMode, !resourceMode);
bool missingMaskerData = !m_masker.contains(renderer);
if (missingMaskerData)
m_masker.set(renderer, makeUnique<MaskerData>());
MaskerData* maskerData = m_masker.get(renderer);
AffineTransform absoluteTransform = SVGRenderingContext::calculateTransformationToOutermostCoordinateSystem(renderer);
// FIXME: This needs to be bounding box and should not use repaint rect.
// https://bugs.webkit.org/show_bug.cgi?id=278551
FloatRect repaintRect = renderer.repaintRectInLocalCoordinates(RepaintRectCalculation::Accurate);
// Ignore 2D rotation, as it doesn't affect the size of the mask.
FloatSize scale(absoluteTransform.xScale(), absoluteTransform.yScale());
// Determine scale factor for the mask. The size of intermediate ImageBuffers shouldn't be bigger than kMaxFilterSize.
ImageBuffer::sizeNeedsClamping(repaintRect.size(), scale);
if (!maskerData->maskImage && !repaintRect.isEmpty()) {
auto maskColorSpace = DestinationColorSpace::SRGB();
auto drawColorSpace = DestinationColorSpace::SRGB();
if (style().svgStyle().colorInterpolation() == ColorInterpolation::LinearRGB) {
#if USE(CG) || USE(SKIA)
maskColorSpace = DestinationColorSpace::LinearSRGB();
#endif
drawColorSpace = DestinationColorSpace::LinearSRGB();
}
// FIXME (149470): This image buffer should not be unconditionally unaccelerated. Making it match the context breaks alpha masking, though.
maskerData->maskImage = context->createScaledImageBuffer(repaintRect, scale, maskColorSpace, RenderingMode::Unaccelerated);
if (!maskerData->maskImage)
return { };
if (!drawContentIntoMaskImage(maskerData, drawColorSpace, &renderer))
maskerData->maskImage = nullptr;
}
if (!maskerData->maskImage)
return { };
SVGRenderingContext::clipToImageBuffer(*context, repaintRect, scale, maskerData->maskImage, missingMaskerData);
return { ApplyResult::ResourceApplied };
}
bool LegacyRenderSVGResourceMasker::drawContentIntoMaskImage(MaskerData* maskerData, const DestinationColorSpace& colorSpace, RenderObject* object)
{
auto& maskImageContext = maskerData->maskImage->context();
auto objectBoundingBox = object->objectBoundingBox();
if (!drawContentIntoContext(maskImageContext, objectBoundingBox))
return false;
#if !USE(CG) && !USE(SKIA)
maskerData->maskImage->transformToColorSpace(colorSpace);
#else
UNUSED_PARAM(colorSpace);
#endif
// Create the luminance mask.
if (style().svgStyle().maskType() == MaskType::Luminance)
maskerData->maskImage->convertToLuminanceMask();
return true;
}
bool LegacyRenderSVGResourceMasker::drawContentIntoContext(GraphicsContext& context, const FloatRect& objectBoundingBox)
{
// Eventually adjust the mask image context according to the target objectBoundingBox.
AffineTransform maskContentTransformation;
if (maskElement().maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
maskContentTransformation.translate(objectBoundingBox.location());
maskContentTransformation.scale(objectBoundingBox.size());
context.concatCTM(maskContentTransformation);
}
// Draw the content into the ImageBuffer.
for (auto& child : childrenOfType<SVGElement>(protectedMaskElement())) {
auto renderer = child.renderer();
if (!renderer)
continue;
if (renderer->needsLayout())
return false;
const RenderStyle& style = renderer->style();
if (style.display() == DisplayType::None || style.usedVisibility() != Visibility::Visible)
continue;
SVGRenderingContext::renderSubtreeToContext(context, *renderer, maskContentTransformation);
}
return true;
}
bool LegacyRenderSVGResourceMasker::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() });
}
void LegacyRenderSVGResourceMasker::calculateMaskContentRepaintRect(RepaintRectCalculation repaintRectCalculation)
{
for (Node* childNode = maskElement().firstChild(); childNode; childNode = childNode->nextSibling()) {
RenderObject* renderer = childNode->renderer();
if (!childNode->isSVGElement() || !renderer)
continue;
const RenderStyle& style = renderer->style();
if (style.display() == DisplayType::None || style.usedVisibility() != Visibility::Visible)
continue;
m_maskContentBoundaries[repaintRectCalculation].unite(renderer->localToParentTransform().mapRect(renderer->repaintRectInLocalCoordinates(repaintRectCalculation)));
}
}
FloatRect LegacyRenderSVGResourceMasker::resourceBoundingBox(const RenderObject& object, RepaintRectCalculation repaintRectCalculation)
{
FloatRect objectBoundingBox = object.objectBoundingBox();
Ref maskElement = this->maskElement();
FloatRect maskBoundaries = SVGLengthContext::resolveRectangle<SVGMaskElement>(maskElement.ptr(), maskElement->maskUnits(), objectBoundingBox);
// Resource was not layouted yet. Give back clipping rect of the mask.
if (selfNeedsLayout())
return maskBoundaries;
if (m_maskContentBoundaries[repaintRectCalculation].isEmpty())
calculateMaskContentRepaintRect(repaintRectCalculation);
FloatRect maskRect = m_maskContentBoundaries[repaintRectCalculation];
if (maskElement->maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
AffineTransform transform;
transform.translate(objectBoundingBox.location());
transform.scale(objectBoundingBox.size());
maskRect = transform.mapRect(maskRect);
}
maskRect.intersect(maskBoundaries);
return maskRect;
}
} // namespace WebCore
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