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/*
* Copyright (C) 2021, 2022, 2023, 2024 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 "RenderSVGResourcePattern.h"
#if ENABLE(LAYER_BASED_SVG_ENGINE)
#include "ElementChildIteratorInlines.h"
#include "RenderLayer.h"
#include "RenderSVGModelObjectInlines.h"
#include "RenderSVGResourcePatternInlines.h"
#include "RenderSVGShape.h"
#include "SVGElementTypeHelpers.h"
#include "SVGFitToViewBox.h"
#include "SVGRenderStyle.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGResourcePattern);
RenderSVGResourcePattern::RenderSVGResourcePattern(SVGElement& element, RenderStyle&& style)
: RenderSVGResourcePaintServer(Type::SVGResourcePattern, element, WTFMove(style))
{
}
RenderSVGResourcePattern::~RenderSVGResourcePattern() = default;
void RenderSVGResourcePattern::collectPatternAttributesIfNeeded()
{
if (m_attributes.has_value())
return;
auto attributes = PatternAttributes { };
SVGPatternElement* current = &patternElement();
patternElement().synchronizeAllAttributes();
while (current) {
if (!current->renderer())
break;
current->collectPatternAttributes(attributes);
auto target = SVGURIReference::targetElementFromIRIString(current->href(), current->treeScopeForSVGReferences());
current = dynamicDowncast<SVGPatternElement>(target.element.get());
}
// If we couldn't determine the pattern content element root, stop here.
if (!attributes.patternContentElement())
return;
// An empty viewBox disables rendering.
if (attributes.hasViewBox() && attributes.viewBox().isEmpty())
return;
m_attributes = WTFMove(attributes);
}
static void clear2DRotation(AffineTransform& transform)
{
AffineTransform::DecomposedType decomposition;
transform.decompose(decomposition);
decomposition.angle = 0;
transform.recompose(decomposition);
}
RefPtr<Pattern> RenderSVGResourcePattern::buildPattern(GraphicsContext& context, const RenderLayerModelObject& renderer)
{
collectPatternAttributesIfNeeded();
if (!m_attributes)
return nullptr;
// Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified,
// then the given effect (e.g. a gradient or a filter) will be ignored.
FloatRect objectBoundingBox = renderer.objectBoundingBox();
if (m_attributes->patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
return nullptr;
// Compute all necessary transformations to build the tile image & the pattern.
FloatRect tileBoundaries;
AffineTransform tileImageTransform;
if (!buildTileImageTransform(renderer, *m_attributes, patternElement(), tileBoundaries, tileImageTransform))
return nullptr;
// Ignore 2D rotation, as it doesn't affect the size of the tile.
auto absoluteTransformIgnoringRotation = context.getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
clear2DRotation(absoluteTransformIgnoringRotation);
FloatRect absoluteTileBoundaries = absoluteTransformIgnoringRotation.mapRect(tileBoundaries);
// Scale the tile size to match the scale level of the patternTransform.
absoluteTileBoundaries.scale(static_cast<float>(m_attributes->patternTransform().xScale()), static_cast<float>(m_attributes->patternTransform().yScale()));
// Build tile image.
auto tileImage = createTileImage(*m_attributes, tileBoundaries, absoluteTileBoundaries, tileImageTransform);
if (!tileImage)
return nullptr;
auto tileImageSize = tileImage->logicalSize();
auto copiedImage = ImageBuffer::sinkIntoNativeImage(WTFMove(tileImage));
if (!copiedImage)
return nullptr;
// Compute pattern space transformation.
AffineTransform patternSpaceTransform;
patternSpaceTransform.translate(tileBoundaries.location());
patternSpaceTransform.scale(tileBoundaries.size() / tileImageSize);
auto patternTransform = m_attributes->patternTransform();
if (!patternTransform.isIdentity())
patternSpaceTransform = patternTransform * patternSpaceTransform;
// Build pattern.
return Pattern::create({ copiedImage.releaseNonNull() }, { true, true, patternSpaceTransform });
}
bool RenderSVGResourcePattern::prepareFillOperation(GraphicsContext& context, const RenderLayerModelObject& targetRenderer, const RenderStyle& style)
{
auto pattern = buildPattern(context, targetRenderer);
if (!pattern)
return false;
const auto& svgStyle = style.svgStyle();
context.setAlpha(svgStyle.fillOpacity());
context.setFillRule(svgStyle.fillRule());
context.setFillPattern(pattern.copyRef().releaseNonNull());
return true;
}
bool RenderSVGResourcePattern::prepareStrokeOperation(GraphicsContext& context, const RenderLayerModelObject& targetRenderer, const RenderStyle& style)
{
auto pattern = buildPattern(context, targetRenderer);
if (!pattern)
return false;
const auto& svgStyle = style.svgStyle();
context.setAlpha(svgStyle.strokeOpacity());
SVGRenderSupport::applyStrokeStyleToContext(context, style, targetRenderer);
if (svgStyle.vectorEffect() == VectorEffect::NonScalingStroke) {
if (auto* shape = dynamicDowncast<RenderSVGShape>(targetRenderer))
pattern->setPatternSpaceTransform(shape->nonScalingStrokeTransform().multiply(pattern->patternSpaceTransform()));
}
context.setStrokePattern(pattern.releaseNonNull());
return true;
}
bool RenderSVGResourcePattern::buildTileImageTransform(const RenderElement& renderer, const PatternAttributes& attributes, const SVGPatternElement& patternElement, FloatRect& patternBoundaries, AffineTransform& tileImageTransform) const
{
auto objectBoundingBox = renderer.objectBoundingBox();
patternBoundaries = calculatePatternBoundaries(attributes, objectBoundingBox, patternElement);
if (patternBoundaries.width() <= 0 || patternBoundaries.height() <= 0)
return false;
auto viewBoxCTM = SVGFitToViewBox::viewBoxToViewTransform(attributes.viewBox(), attributes.preserveAspectRatio(), patternBoundaries.width(), patternBoundaries.height());
// Apply viewBox/objectBoundingBox transformations.
if (!viewBoxCTM.isIdentity())
tileImageTransform = viewBoxCTM;
else if (attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
tileImageTransform.scale(objectBoundingBox.width(), objectBoundingBox.height());
return true;
}
RefPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(const PatternAttributes& attributes, const FloatRect& tileBoundaries, const FloatRect& absoluteTileBoundaries, const AffineTransform& tileImageTransform) const
{
auto* patternRenderer = static_cast<RenderSVGResourcePattern*>(attributes.patternContentElement()->renderer());
ASSERT(patternRenderer);
ASSERT(patternRenderer->hasLayer());
if (SVGHitTestCycleDetectionScope::isVisiting(*patternRenderer))
return nullptr;
// FIXME: consider color space handling/'color-interpolation'.
auto clampedAbsoluteTileBoundaries = ImageBuffer::clampedRect(absoluteTileBoundaries);
auto tileImage = ImageBuffer::create(roundedIntSize(clampedAbsoluteTileBoundaries.size()), RenderingPurpose::Unspecified, 1, DestinationColorSpace::SRGB(), PixelFormat::BGRA8);
if (!tileImage)
return nullptr;
auto& tileImageContext = tileImage->context();
GraphicsContextStateSaver stateSaver(tileImageContext);
FloatSize unclampedSize = roundedIntSize(tileBoundaries.size());
// Compensate rounding effects, as the absolute target rect is using floating-point numbers and the image buffer size is integer.
tileImageContext.scale(unclampedSize / tileBoundaries.size());
// The image buffer represents the final rendered size, so the content has to be scaled (to avoid pixelation).
tileImageContext.scale(clampedAbsoluteTileBoundaries.size() / tileBoundaries.size());
// Draw the content into the ImageBuffer.
patternRenderer->layer()->paintSVGResourceLayer(tileImageContext, tileImageTransform);
return tileImage;
}
}
#endif // ENABLE(LAYER_BASED_SVG_ENGINE)
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