FilterEffectRenderer.cpp [plain text]
#include "config.h"
#if ENABLE(CSS_FILTERS)
#include "FilterEffectRenderer.h"
#include "Document.h"
#include "FEColorMatrix.h"
#include "FEComponentTransfer.h"
#include "FEDropShadow.h"
#include "FEGaussianBlur.h"
#include "FEMerge.h"
#include "FloatConversion.h"
#include "RenderLayer.h"
#include <algorithm>
#include <wtf/MathExtras.h>
#if ENABLE(CSS_SHADERS) && ENABLE(WEBGL)
#include "CustomFilterProgram.h"
#include "CustomFilterOperation.h"
#include "FECustomFilter.h"
#include "FrameView.h"
#include "Settings.h"
#endif
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);
}
inline bool isFilterSizeValid(FloatRect rect)
{
if (rect.width() < 0 || rect.width() > kMaxFilterSize
|| rect.height() < 0 || rect.height() > kMaxFilterSize)
return false;
return true;
}
#if ENABLE(CSS_SHADERS) && ENABLE(WEBGL)
static bool isCSSCustomFilterEnabled(Document* document)
{
Settings* settings = document->settings();
return settings && settings->isCSSCustomFilterEnabled() && settings->webGLEnabled();
}
#endif
FilterEffectRenderer::FilterEffectRenderer()
: m_topOutset(0)
, m_rightOutset(0)
, m_bottomOutset(0)
, m_leftOutset(0)
, m_graphicsBufferAttached(false)
, m_hasFilterThatMovesPixels(false)
#if ENABLE(CSS_SHADERS)
, m_hasCustomShaderFilter(false)
#endif
{
setFilterResolution(FloatSize(1, 1));
m_sourceGraphic = SourceGraphic::create(this);
}
FilterEffectRenderer::~FilterEffectRenderer()
{
}
GraphicsContext* FilterEffectRenderer::inputContext()
{
return sourceImage() ? sourceImage()->context() : 0;
}
bool FilterEffectRenderer::build(Document* document, const FilterOperations& operations)
{
#if !ENABLE(CSS_SHADERS) || !ENABLE(WEBGL)
UNUSED_PARAM(document);
#endif
#if ENABLE(CSS_SHADERS)
m_hasCustomShaderFilter = false;
#endif
m_hasFilterThatMovesPixels = operations.hasFilterThatMovesPixels();
if (m_hasFilterThatMovesPixels)
operations.getOutsets(m_topOutset, m_rightOutset, m_bottomOutset, m_leftOutset);
m_effects.clear();
RefPtr<FilterEffect> previousEffect;
for (size_t i = 0; i < operations.operations().size(); ++i) {
RefPtr<FilterEffect> effect;
FilterOperation* filterOperation = operations.operations().at(i).get();
switch (filterOperation->getOperationType()) {
case FilterOperation::REFERENCE: {
break;
}
case FilterOperation::GRAYSCALE: {
BasicColorMatrixFilterOperation* colorMatrixOperation = static_cast<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 = static_cast<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 = static_cast<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 = static_cast<BasicColorMatrixFilterOperation*>(filterOperation);
Vector<float> inputParameters;
inputParameters.append(narrowPrecisionToFloat(colorMatrixOperation->amount()));
effect = FEColorMatrix::create(this, FECOLORMATRIX_TYPE_HUEROTATE, inputParameters);
break;
}
case FilterOperation::INVERT: {
BasicComponentTransferFilterOperation* componentTransferOperation = static_cast<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 = static_cast<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 = static_cast<BasicComponentTransferFilterOperation*>(filterOperation);
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR;
transferFunction.slope = 1;
transferFunction.intercept = narrowPrecisionToFloat(componentTransferOperation->amount());
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(this, transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::CONTRAST: {
BasicComponentTransferFilterOperation* componentTransferOperation = static_cast<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 = static_cast<BlurFilterOperation*>(filterOperation);
float stdDeviation = floatValueForLength(blurOperation->stdDeviation(), 0);
effect = FEGaussianBlur::create(this, stdDeviation, stdDeviation);
break;
}
case FilterOperation::DROP_SHADOW: {
DropShadowFilterOperation* dropShadowOperation = static_cast<DropShadowFilterOperation*>(filterOperation);
effect = FEDropShadow::create(this, dropShadowOperation->stdDeviation(), dropShadowOperation->stdDeviation(),
dropShadowOperation->x(), dropShadowOperation->y(), dropShadowOperation->color(), 1);
break;
}
#if ENABLE(CSS_SHADERS)
case FilterOperation::CUSTOM: {
#if ENABLE(WEBGL)
if (!isCSSCustomFilterEnabled(document))
continue;
CustomFilterOperation* customFilterOperation = static_cast<CustomFilterOperation*>(filterOperation);
RefPtr<CustomFilterProgram> program = customFilterOperation->program();
if (program->isLoaded()) {
effect = FECustomFilter::create(this, document->view()->root()->hostWindow(), program, customFilterOperation->parameters(),
customFilterOperation->meshRows(), customFilterOperation->meshColumns(),
customFilterOperation->meshBoxType(), customFilterOperation->meshType());
m_hasCustomShaderFilter = true;
}
#endif
break;
}
#endif
default:
break;
}
if (effect) {
effect->setClipsToBounds(false);
if (previousEffect)
effect->inputEffects().append(previousEffect);
m_effects.append(effect);
previousEffect = effect.release();
}
}
if (!previousEffect)
return false;
m_effects.first()->inputEffects().append(m_sourceGraphic);
setMaxEffectRects(m_sourceDrawingRegion);
return true;
}
bool FilterEffectRenderer::updateBackingStoreRect(const FloatRect& filterRect)
{
if (!filterRect.isZero() && isFilterSizeValid(filterRect)) {
FloatRect currentSourceRect = sourceImageRect();
if (filterRect != currentSourceRect) {
setSourceImageRect(filterRect);
return true;
}
}
return false;
}
void FilterEffectRenderer::allocateBackingStoreIfNeeded()
{
if (!m_graphicsBufferAttached) {
IntSize logicalSize(m_sourceDrawingRegion.width(), m_sourceDrawingRegion.height());
if (!sourceImage() || sourceImage()->logicalSize() != logicalSize)
setSourceImage(ImageBuffer::create(logicalSize, 1, ColorSpaceDeviceRGB, renderingMode()));
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()
{
lastEffect()->apply();
}
LayoutRect FilterEffectRenderer::computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect)
{
#if ENABLE(CSS_SHADERS)
if (hasCustomShaderFilter()) {
return filterBoxRect;
}
#endif
LayoutRect rectForRepaint = dirtyRect;
if (hasFilterThatMovesPixels()) {
rectForRepaint.move(-m_rightOutset, -m_bottomOutset);
rectForRepaint.expand(m_leftOutset + m_rightOutset, m_topOutset + m_bottomOutset);
}
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::beginFilterEffect(GraphicsContext* oldContext)
{
ASSERT(m_renderLayer);
FilterEffectRenderer* filter = m_renderLayer->filterRenderer();
filter->allocateBackingStoreIfNeeded();
GraphicsContext* sourceGraphicsContext = filter->inputContext();
if (!sourceGraphicsContext || !isFilterSizeValid(filter->filterRegion())) {
m_haveFilterEffect = false;
return oldContext;
}
m_savedGraphicsContext = oldContext;
sourceGraphicsContext->save();
sourceGraphicsContext->translate(-m_paintOffset.x(), -m_paintOffset.y());
sourceGraphicsContext->clearRect(m_repaintRect);
sourceGraphicsContext->clip(m_repaintRect);
return sourceGraphicsContext;
}
GraphicsContext* FilterEffectRendererHelper::applyFilterEffect()
{
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());
m_savedGraphicsContext->drawImageBuffer(filter->output(), m_renderLayer->renderer()->style()->colorSpace(), pixelSnappedIntRect(destRect), CompositeSourceOver);
filter->clearIntermediateResults();
return m_savedGraphicsContext;
}
}
#endif // ENABLE(CSS_FILTERS)