FilterEffectRenderer.cpp [plain text]
#include "config.h"
#include "FilterEffectRenderer.h"
#include "CachedSVGDocument.h"
#include "CachedSVGDocumentReference.h"
#include "ColorSpace.h"
#include "Document.h"
#include "ElementIterator.h"
#include "FEColorMatrix.h"
#include "FEComponentTransfer.h"
#include "FEDropShadow.h"
#include "FEGaussianBlur.h"
#include "FEMerge.h"
#include "FloatConversion.h"
#include "Frame.h"
#include "RenderLayer.h"
#include "SVGElement.h"
#include "SVGFilterPrimitiveStandardAttributes.h"
#include "Settings.h"
#include <algorithm>
#include <wtf/MathExtras.h>
namespace WebCore {
static inline void endMatrixRow(Vector<float>& parameters)
{
parameters.append(0);
parameters.append(0);
}
static inline void lastMatrixRow(Vector<float>& parameters)
{
parameters.append(0);
parameters.append(0);
parameters.append(0);
parameters.append(1);
parameters.append(0);
}
FilterEffectRenderer::FilterEffectRenderer()
: Filter(AffineTransform())
{
setFilterResolution(FloatSize(1, 1));
m_sourceGraphic = SourceGraphic::create(*this);
}
FilterEffectRenderer::~FilterEffectRenderer()
{
}
GraphicsContext* FilterEffectRenderer::inputContext()
{
return sourceImage() ? &sourceImage()->context() : nullptr;
}
PassRefPtr<FilterEffect> FilterEffectRenderer::buildReferenceFilter(RenderElement* renderer, PassRefPtr<FilterEffect> previousEffect, ReferenceFilterOperation* filterOperation)
{
if (!renderer)
return nullptr;
Document* document = &renderer->document();
CachedSVGDocumentReference* cachedSVGDocumentReference = filterOperation->cachedSVGDocumentReference();
CachedSVGDocument* cachedSVGDocument = cachedSVGDocumentReference ? cachedSVGDocumentReference->document() : 0;
if (cachedSVGDocument)
document = cachedSVGDocument->document();
if (!document)
return nullptr;
Element* filter = document->getElementById(filterOperation->fragment());
if (!filter) {
if (Element* element = renderer->element())
document->accessSVGExtensions().addPendingResource(filterOperation->fragment(), element);
return nullptr;
}
RefPtr<FilterEffect> effect;
auto builder = std::make_unique<SVGFilterBuilder>(previousEffect);
for (auto& effectElement : childrenOfType<SVGFilterPrimitiveStandardAttributes>(*filter)) {
effect = effectElement.build(builder.get(), *this);
if (!effect)
continue;
effectElement.setStandardAttributes(effect.get());
builder->add(effectElement.result(), effect);
m_effects.append(effect);
}
return effect;
}
bool FilterEffectRenderer::build(RenderElement* renderer, const FilterOperations& operations, FilterConsumer consumer)
{
m_hasFilterThatMovesPixels = operations.hasFilterThatMovesPixels();
if (m_hasFilterThatMovesPixels)
m_outsets = operations.outsets();
m_effects.clear();
RefPtr<FilterEffect> previousEffect = m_sourceGraphic;
for (size_t i = 0; i < operations.operations().size(); ++i) {
RefPtr<FilterEffect> effect;
FilterOperation& filterOperation = *operations.operations().at(i);
switch (filterOperation.type()) {
case FilterOperation::REFERENCE: {
ReferenceFilterOperation& referenceOperation = downcast<ReferenceFilterOperation>(filterOperation);
effect = buildReferenceFilter(renderer, previousEffect, &referenceOperation);
referenceOperation.setFilterEffect(effect);
break;
}
case FilterOperation::GRAYSCALE: {
BasicColorMatrixFilterOperation& colorMatrixOperation = downcast<BasicColorMatrixFilterOperation>(filterOperation);
Vector<float> inputParameters;
double oneMinusAmount = clampTo(1 - colorMatrixOperation.amount(), 0.0, 1.0);
inputParameters.append(narrowPrecisionToFloat(0.2126 + 0.7874 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.7152 - 0.7152 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.0722 - 0.0722 * oneMinusAmount));
endMatrixRow(inputParameters);
inputParameters.append(narrowPrecisionToFloat(0.2126 - 0.2126 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.7152 + 0.2848 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.0722 - 0.0722 * oneMinusAmount));
endMatrixRow(inputParameters);
inputParameters.append(narrowPrecisionToFloat(0.2126 - 0.2126 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.7152 - 0.7152 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.0722 + 0.9278 * oneMinusAmount));
endMatrixRow(inputParameters);
lastMatrixRow(inputParameters);
effect = FEColorMatrix::create(*this, FECOLORMATRIX_TYPE_MATRIX, inputParameters);
break;
}
case FilterOperation::SEPIA: {
BasicColorMatrixFilterOperation& colorMatrixOperation = downcast<BasicColorMatrixFilterOperation>(filterOperation);
Vector<float> inputParameters;
double oneMinusAmount = clampTo(1 - colorMatrixOperation.amount(), 0.0, 1.0);
inputParameters.append(narrowPrecisionToFloat(0.393 + 0.607 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.769 - 0.769 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.189 - 0.189 * oneMinusAmount));
endMatrixRow(inputParameters);
inputParameters.append(narrowPrecisionToFloat(0.349 - 0.349 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.686 + 0.314 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.168 - 0.168 * oneMinusAmount));
endMatrixRow(inputParameters);
inputParameters.append(narrowPrecisionToFloat(0.272 - 0.272 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.534 - 0.534 * oneMinusAmount));
inputParameters.append(narrowPrecisionToFloat(0.131 + 0.869 * oneMinusAmount));
endMatrixRow(inputParameters);
lastMatrixRow(inputParameters);
effect = FEColorMatrix::create(*this, FECOLORMATRIX_TYPE_MATRIX, inputParameters);
break;
}
case FilterOperation::SATURATE: {
BasicColorMatrixFilterOperation& colorMatrixOperation = downcast<BasicColorMatrixFilterOperation>(filterOperation);
Vector<float> inputParameters;
inputParameters.append(narrowPrecisionToFloat(colorMatrixOperation.amount()));
effect = FEColorMatrix::create(*this, FECOLORMATRIX_TYPE_SATURATE, inputParameters);
break;
}
case FilterOperation::HUE_ROTATE: {
BasicColorMatrixFilterOperation& colorMatrixOperation = downcast<BasicColorMatrixFilterOperation>(filterOperation);
Vector<float> inputParameters;
inputParameters.append(narrowPrecisionToFloat(colorMatrixOperation.amount()));
effect = FEColorMatrix::create(*this, FECOLORMATRIX_TYPE_HUEROTATE, inputParameters);
break;
}
case FilterOperation::INVERT: {
BasicComponentTransferFilterOperation& componentTransferOperation = downcast<BasicComponentTransferFilterOperation>(filterOperation);
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_TABLE;
Vector<float> transferParameters;
transferParameters.append(narrowPrecisionToFloat(componentTransferOperation.amount()));
transferParameters.append(narrowPrecisionToFloat(1 - componentTransferOperation.amount()));
transferFunction.tableValues = transferParameters;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(*this, transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::OPACITY: {
BasicComponentTransferFilterOperation& componentTransferOperation = downcast<BasicComponentTransferFilterOperation>(filterOperation);
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_TABLE;
Vector<float> transferParameters;
transferParameters.append(0);
transferParameters.append(narrowPrecisionToFloat(componentTransferOperation.amount()));
transferFunction.tableValues = transferParameters;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(*this, nullFunction, nullFunction, nullFunction, transferFunction);
break;
}
case FilterOperation::BRIGHTNESS: {
BasicComponentTransferFilterOperation& componentTransferOperation = downcast<BasicComponentTransferFilterOperation>(filterOperation);
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR;
transferFunction.slope = narrowPrecisionToFloat(componentTransferOperation.amount());
transferFunction.intercept = 0;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(*this, transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::CONTRAST: {
BasicComponentTransferFilterOperation& componentTransferOperation = downcast<BasicComponentTransferFilterOperation>(filterOperation);
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR;
float amount = narrowPrecisionToFloat(componentTransferOperation.amount());
transferFunction.slope = amount;
transferFunction.intercept = -0.5 * amount + 0.5;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(*this, transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::BLUR: {
BlurFilterOperation& blurOperation = downcast<BlurFilterOperation>(filterOperation);
float stdDeviation = floatValueForLength(blurOperation.stdDeviation(), 0);
effect = FEGaussianBlur::create(*this, stdDeviation, stdDeviation, consumer == FilterProperty ? EDGEMODE_NONE : EDGEMODE_DUPLICATE);
break;
}
case FilterOperation::DROP_SHADOW: {
DropShadowFilterOperation& dropShadowOperation = downcast<DropShadowFilterOperation>(filterOperation);
effect = FEDropShadow::create(*this, dropShadowOperation.stdDeviation(), dropShadowOperation.stdDeviation(),
dropShadowOperation.x(), dropShadowOperation.y(), dropShadowOperation.color(), 1);
break;
}
default:
break;
}
if (effect) {
effect->setClipsToBounds(consumer == FilterFunction);
effect->setOperatingColorSpace(ColorSpaceSRGB);
if (filterOperation.type() != FilterOperation::REFERENCE) {
effect->inputEffects().append(previousEffect);
m_effects.append(effect);
}
previousEffect = WTFMove(effect);
}
}
if (!m_effects.size())
return false;
setMaxEffectRects(m_sourceDrawingRegion);
return true;
}
bool FilterEffectRenderer::updateBackingStoreRect(const FloatRect& filterRect)
{
if (filterRect.isEmpty() || ImageBuffer::sizeNeedsClamping(filterRect.size()))
return false;
if (filterRect == sourceImageRect())
return false;
setSourceImageRect(filterRect);
return true;
}
void FilterEffectRenderer::allocateBackingStoreIfNeeded()
{
if (!m_graphicsBufferAttached) {
IntSize logicalSize(m_sourceDrawingRegion.width(), m_sourceDrawingRegion.height());
if (!sourceImage() || sourceImage()->logicalSize() != logicalSize)
setSourceImage(ImageBuffer::create(logicalSize, renderingMode(), filterScale()));
m_graphicsBufferAttached = true;
}
}
void FilterEffectRenderer::clearIntermediateResults()
{
m_sourceGraphic->clearResult();
for (size_t i = 0; i < m_effects.size(); ++i)
m_effects[i]->clearResult();
}
void FilterEffectRenderer::apply()
{
RefPtr<FilterEffect> effect = lastEffect();
effect->apply();
effect->transformResultColorSpace(ColorSpaceSRGB);
}
LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
{
LayoutRect rectForRepaint = dirtyRect;
if (hasFilterThatMovesPixels()) {
rectForRepaint.move(-m_outsets.right(), -m_outsets.bottom());
rectForRepaint.expand(m_outsets.left() + m_outsets.right(), m_outsets.top() + m_outsets.bottom());
}
rectForRepaint.intersect(filterBoxRect);
return rectForRepaint;
}
bool FilterEffectRendererHelper::prepareFilterEffect(RenderLayer* renderLayer, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect, const LayoutRect& layerRepaintRect)
{
ASSERT(m_haveFilterEffect && renderLayer->filterRenderer());
m_renderLayer = renderLayer;
m_repaintRect = dirtyRect;
FilterEffectRenderer* filter = renderLayer->filterRenderer();
LayoutRect filterSourceRect = filter->computeSourceImageRectForDirtyRect(filterBoxRect, dirtyRect);
m_paintOffset = filterSourceRect.location();
if (filterSourceRect.isEmpty()) {
m_haveFilterEffect = false;
return false;
}
bool hasUpdatedBackingStore = filter->updateBackingStoreRect(filterSourceRect);
if (filter->hasFilterThatMovesPixels()) {
if (hasUpdatedBackingStore)
m_repaintRect = filterSourceRect;
else {
m_repaintRect.unite(layerRepaintRect);
m_repaintRect.intersect(filterSourceRect);
}
}
return true;
}
GraphicsContext* FilterEffectRendererHelper::filterContext() const
{
if (!m_haveFilterEffect)
return nullptr;
FilterEffectRenderer* filter = m_renderLayer->filterRenderer();
return filter->inputContext();
}
bool FilterEffectRendererHelper::beginFilterEffect()
{
ASSERT(m_renderLayer);
FilterEffectRenderer* filter = m_renderLayer->filterRenderer();
filter->allocateBackingStoreIfNeeded();
GraphicsContext* sourceGraphicsContext = filter->inputContext();
if (!sourceGraphicsContext || filter->filterRegion().isEmpty() || ImageBuffer::sizeNeedsClamping(filter->filterRegion().size())) {
m_haveFilterEffect = false;
return false;
}
sourceGraphicsContext->save();
sourceGraphicsContext->translate(-m_paintOffset.x(), -m_paintOffset.y());
sourceGraphicsContext->clearRect(m_repaintRect);
sourceGraphicsContext->clip(m_repaintRect);
m_startedFilterEffect = true;
return true;
}
void FilterEffectRendererHelper::applyFilterEffect(GraphicsContext& destinationContext)
{
ASSERT(m_haveFilterEffect && m_renderLayer->filterRenderer());
FilterEffectRenderer* filter = m_renderLayer->filterRenderer();
filter->inputContext()->restore();
filter->apply();
LayoutRect destRect = filter->outputRect();
destRect.move(m_paintOffset.x(), m_paintOffset.y());
if (ImageBuffer* outputBuffer = filter->output())
destinationContext.drawImageBuffer(*outputBuffer, snapRectToDevicePixels(destRect, m_renderLayer->renderer().document().deviceScaleFactor()));
filter->clearIntermediateResults();
}
}