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CSSFilterRenderer.cpp
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330 lines (267 loc) · 12.9 KB
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/*
* Copyright (C) 2011-2025 Apple Inc. All rights reserved.
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CSSFilterRenderer.h"
#include "Logging.h"
#include "ReferencedSVGResources.h"
#include "RenderElement.h"
#include "RenderObjectInlines.h"
#include "SVGFilterElement.h"
#include "SVGFilterRenderer.h"
#include "SourceGraphic.h"
#include "StyleFilter.h"
#include "StylePrimitiveNumericTypes+Logging.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(CSSFilterRenderer);
RefPtr<CSSFilterRenderer> CSSFilterRenderer::create(RenderElement& renderer, const Style::Filter& filter, const FilterGeometry& geometry, OptionSet<FilterRenderingMode> preferredRenderingModes, bool showDebugOverlay, const GraphicsContext& destinationContext)
{
bool hasFilterThatMovesPixels = filter.hasFilterThatMovesPixels();
bool hasFilterThatShouldBeRestrictedBySecurityOrigin = filter.hasFilterThatShouldBeRestrictedBySecurityOrigin();
auto filterRenderer = adoptRef(*new CSSFilterRenderer(geometry, hasFilterThatMovesPixels, hasFilterThatShouldBeRestrictedBySecurityOrigin));
if (!filterRenderer->buildFilterFunctions(renderer, filter, preferredRenderingModes, destinationContext)) {
LOG_WITH_STREAM(Filters, stream << "CSSFilterRenderer::create: failed to build filters " << filter);
return nullptr;
}
filterRenderer->setFilterRenderingModes(preferredRenderingModes);
filterRenderer->setIsShowingDebugOverlay(showDebugOverlay);
LOG_WITH_STREAM(Filters, stream << "CSSFilterRenderer::create built filter " << filterRenderer.get() << " for " << filter << " supported rendering mode(s) " << filterRenderer->filterRenderingModes());
return filterRenderer;
}
Ref<CSSFilterRenderer> CSSFilterRenderer::create(Vector<Ref<FilterFunction>>&& functions, const FilterGeometry& geometry, OptionSet<FilterRenderingMode> preferredRenderingModes, bool showDebugOverlay)
{
Ref filter = adoptRef(*new CSSFilterRenderer(WTF::move(functions), geometry));
// Setting filter rendering modes cannot be moved to the constructor because it ends up
// calling supportedFilterRenderingModes() which is a virtual function.
filter->setFilterRenderingModes(preferredRenderingModes);
filter->setIsShowingDebugOverlay(showDebugOverlay);
return filter;
}
CSSFilterRenderer::CSSFilterRenderer(const FilterGeometry& geometry, bool hasFilterThatMovesPixels, bool hasFilterThatShouldBeRestrictedBySecurityOrigin)
: Filter(Filter::Type::CSSFilterRenderer, geometry)
, m_hasFilterThatMovesPixels(hasFilterThatMovesPixels)
, m_hasFilterThatShouldBeRestrictedBySecurityOrigin(hasFilterThatShouldBeRestrictedBySecurityOrigin)
{
}
CSSFilterRenderer::CSSFilterRenderer(Vector<Ref<FilterFunction>>&& functions, const FilterGeometry& geometry)
: Filter(Type::CSSFilterRenderer, geometry)
, m_functions(WTF::move(functions))
{
clampFilterRegionIfNeeded();
}
static RefPtr<SVGFilterElement> referenceFilterElement(const Style::FilterReference& filterReference, RenderElement& renderer)
{
RefPtr filterElement = ReferencedSVGResources::referencedFilterElement(protect(renderer.treeScopeForSVGReferences()), filterReference);
if (!filterElement) {
LOG_WITH_STREAM(Filters, stream << " buildReferenceFilter: failed to find filter renderer, adding pending resource " << filterReference.url);
// Although we did not find the referenced filter, it might exist later in the document.
// FIXME: This skips anonymous RenderObjects. <https://webkit.org/b/131085>
// FIXME: Unclear if this does anything.
return nullptr;
}
return filterElement;
}
static bool isIdentityReferenceFilter(const Style::FilterReference& filterReference, RenderElement& renderer)
{
RefPtr filterElement = referenceFilterElement(filterReference, renderer);
if (!filterElement)
return false;
return SVGFilterRenderer::isIdentity(*filterElement);
}
static IntOutsets calculateReferenceFilterOutsets(const Style::FilterReference& filterReference, RenderElement& renderer, const FloatRect& targetBoundingBox)
{
RefPtr filterElement = referenceFilterElement(filterReference, renderer);
if (!filterElement)
return { };
return SVGFilterRenderer::calculateOutsets(*filterElement, targetBoundingBox);
}
static RefPtr<SVGFilterRenderer> createReferenceFilter(const CSSFilterRenderer& filter, const Style::FilterReference& filterReference, RenderElement& renderer, OptionSet<FilterRenderingMode> preferredRenderingModes, const GraphicsContext& destinationContext)
{
RefPtr filterElement = referenceFilterElement(filterReference, renderer);
if (!filterElement)
return nullptr;
RefPtr contextElement = dynamicDowncast<SVGElement>(renderer.element());
auto geometry = filter.geometry();
geometry.filterRegion = SVGLengthContext::resolveRectangle(contextElement.get(), *filterElement, filterElement->filterUnits(), filter.referenceBox());
if (geometry.filterRegion.isEmpty())
return nullptr;
auto filterRenderer = SVGFilterRenderer::create(contextElement.get(), *filterElement, geometry, preferredRenderingModes, destinationContext);
if (filterRenderer)
filterRenderer->setIsShowingDebugOverlay(filter.isShowingDebugOverlay());
return filterRenderer;
}
RefPtr<FilterFunction> CSSFilterRenderer::buildFilterFunction(RenderElement& renderer, const Style::FilterValue& filterValue, OptionSet<FilterRenderingMode> preferredRenderingModes, const GraphicsContext& destinationContext)
{
return WTF::switchOn(filterValue,
[&](const Style::FilterReference& filterReference) -> RefPtr<FilterFunction> {
return createReferenceFilter(*this, filterReference, renderer, preferredRenderingModes, destinationContext);
},
[&](const Style::BlurFunction& blurFunction) -> RefPtr<FilterFunction> {
return Style::evaluate<Ref<FilterEffect>>(blurFunction, renderer.style());
},
[&](const Style::DropShadowFunction& dropShadowFunction) -> RefPtr<FilterFunction> {
return Style::evaluate<Ref<FilterEffect>>(dropShadowFunction, renderer.style());
},
[]<CSSValueID C, typename T>(const FunctionNotation<C, T>& filterFunction) -> RefPtr<FilterFunction> {
return Style::evaluate<Ref<FilterEffect>>(filterFunction);
}
);
}
bool CSSFilterRenderer::buildFilterFunctions(RenderElement& renderer, const Style::Filter& filter, OptionSet<FilterRenderingMode> preferredRenderingModes, const GraphicsContext& destinationContext)
{
for (auto& value : filter) {
auto function = buildFilterFunction(renderer, value, preferredRenderingModes, destinationContext);
if (!function)
continue;
if (m_functions.isEmpty())
m_functions.append(SourceGraphic::create());
m_functions.append(function.releaseNonNull());
}
// If we didn't make any effects, tell our caller we are not valid.
if (m_functions.isEmpty())
return false;
m_functions.shrinkToFit();
return true;
}
FilterEffectVector CSSFilterRenderer::effectsOfType(FilterFunction::Type filterType) const
{
FilterEffectVector effects;
for (auto& function : m_functions) {
if (function->filterType() == filterType) {
effects.append({ downcast<FilterEffect>(function.get()) });
continue;
}
if (RefPtr filter = dynamicDowncast<SVGFilterRenderer>(function))
effects.appendVector(filter->effectsOfType(filterType));
}
return effects;
}
OptionSet<FilterRenderingMode> CSSFilterRenderer::supportedFilterRenderingModes(OptionSet<FilterRenderingMode> preferredFilterRenderingModes) const
{
OptionSet<FilterRenderingMode> modes = allFilterRenderingModes;
for (auto& function : m_functions)
modes = modes & function->supportedFilterRenderingModes(preferredFilterRenderingModes);
ASSERT(modes);
return modes;
}
void CSSFilterRenderer::computeEnclosingFilterRegion()
{
#if USE(CORE_IMAGE)
auto enclosingFilterRegion = filterRegion();
for (auto& function : m_functions) {
if (RefPtr filter = dynamicDowncast<Filter>(function))
enclosingFilterRegion.unite(filter->filterRegion());
}
setEnclosingFilterRegion(enclosingFilterRegion);
#endif
}
RefPtr<FilterImage> CSSFilterRenderer::apply(FilterImage* sourceImage, FilterResults& results)
{
ASSERT(filterRenderingModes().contains(FilterRenderingMode::Software));
if (!sourceImage)
return nullptr;
LOG_WITH_STREAM(Filters, stream << "\nCSSFilterRenderer " << this << " apply - filterRegion " << filterRegion() << " scale " << filterScale());
RefPtr<FilterImage> result = sourceImage;
for (auto& function : m_functions) {
result = function->apply(*this, *result, results);
if (!result)
return nullptr;
}
return result;
}
FilterStyleVector CSSFilterRenderer::createFilterStyles(GraphicsContext& context, const FilterStyle& sourceStyle) const
{
ASSERT(filterRenderingModes().contains(FilterRenderingMode::GraphicsContext));
FilterStyleVector styles;
FilterStyle lastStyle = sourceStyle;
for (auto& function : m_functions) {
if (function->filterType() == FilterEffect::Type::SourceGraphic)
continue;
auto result = function->createFilterStyles(context, *this, lastStyle);
if (result.isEmpty())
return { };
lastStyle = result.last();
styles.appendVector(WTF::move(result));
}
return styles;
}
void CSSFilterRenderer::setFilterRegion(const FloatRect& filterRegion)
{
Filter::setFilterRegion(filterRegion);
clampFilterRegionIfNeeded();
}
bool CSSFilterRenderer::isIdentity(RenderElement& renderer, const Style::Filter& filter)
{
if (filter.hasFilterThatShouldBeRestrictedBySecurityOrigin())
return false;
for (auto& value : filter) {
auto hasNonIdentityComponent = WTF::switchOn(value,
[&](const Style::FilterReference& filterReference) {
return !isIdentityReferenceFilter(filterReference, renderer);
},
[](const auto& filterFunction) {
return !filterFunction->isIdentity();
}
);
if (hasNonIdentityComponent)
return false;
}
return true;
}
IntOutsets CSSFilterRenderer::calculateOutsets(RenderElement& renderer, const Style::Filter& filter, const FloatRect& targetBoundingBox)
{
IntOutsets outsets;
auto zoom = renderer.style().usedZoomForLength();
for (auto& value : filter) {
WTF::switchOn(value,
[&](const Style::FilterReference& filterReference) {
outsets += calculateReferenceFilterOutsets(filterReference, renderer, targetBoundingBox);
},
[&](const Style::BlurFunction& blurFunction) {
outsets += blurFunction->calculateOutsets(zoom);
},
[&](const Style::DropShadowFunction& dropShadowFunction) {
outsets += dropShadowFunction->calculateOutsets(zoom);
},
[]<CSSValueID C, typename T>(const FunctionNotation<C, T>&) { }
);
}
return outsets;
}
TextStream& CSSFilterRenderer::externalRepresentation(TextStream& ts, FilterRepresentation representation) const
{
unsigned level = 0;
for (auto it = m_functions.rbegin(), end = m_functions.rend(); it != end; ++it) {
auto& function = *it;
// SourceAlpha is a built-in effect. No need to say SourceGraphic is its input.
if (function->filterType() == FilterEffect::Type::SourceAlpha)
++it;
TextStream::IndentScope indentScope(ts, level++);
function->externalRepresentation(ts, representation);
}
return ts;
}
} // namespace WebCore