blob: 507ab39abfe27ff43ee80dc1e1a2285d857a5b7d [file] [log] [blame]
/*
* Copyright (C) 2011 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 COMPUTER, 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 "core/rendering/FilterEffectRenderer.h"
#include "core/fetch/DocumentResource.h"
#include "core/fetch/DocumentResourceReference.h"
#include "core/frame/Settings.h"
#include "core/page/Page.h"
#include "core/rendering/RenderObject.h"
#include "core/rendering/svg/ReferenceFilterBuilder.h"
#include "core/svg/SVGElement.h"
#include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
#include "platform/FloatConversion.h"
#include "platform/LengthFunctions.h"
#include "platform/graphics/ColorSpace.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/ImageFilter.h"
#include "platform/graphics/UnacceleratedImageBufferSurface.h"
#include "platform/graphics/filters/FEColorMatrix.h"
#include "platform/graphics/filters/FEComponentTransfer.h"
#include "platform/graphics/filters/FEDropShadow.h"
#include "platform/graphics/filters/FEGaussianBlur.h"
#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
#include "platform/graphics/filters/SourceGraphic.h"
#include "wtf/MathExtras.h"
#include <algorithm>
namespace blink {
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()
{
}
FilterEffectRenderer::~FilterEffectRenderer()
{
}
bool FilterEffectRenderer::build(RenderObject* renderer, const FilterOperations& operations)
{
const RenderStyle* style = renderer->style();
float zoom = style ? style->effectiveZoom() : 1.0f;
// Create a parent filter for shorthand filters. These have already been scaled by the CSS code for page zoom, so scale is 1.0 here.
RefPtr<ReferenceFilter> parentFilter = ReferenceFilter::create(1.0f);
RefPtr<FilterEffect> previousEffect = SourceGraphic::create(parentFilter.get());
for (size_t i = 0; i < operations.operations().size(); ++i) {
RefPtr<FilterEffect> effect;
FilterOperation* filterOperation = operations.operations().at(i).get();
switch (filterOperation->type()) {
case FilterOperation::REFERENCE: {
RefPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(zoom);
effect = ReferenceFilterBuilder::build(referenceFilter.get(), renderer, previousEffect.get(), toReferenceFilterOperation(filterOperation));
referenceFilter->setLastEffect(effect);
m_referenceFilters.append(referenceFilter);
break;
}
case FilterOperation::GRAYSCALE: {
Vector<float> inputParameters;
double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0);
// See https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#grayscaleEquivalent
// for information on parameters.
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(parentFilter.get(), FECOLORMATRIX_TYPE_MATRIX, inputParameters);
break;
}
case FilterOperation::SEPIA: {
Vector<float> inputParameters;
double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0);
// See https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#sepiaEquivalent
// for information on parameters.
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(parentFilter.get(), FECOLORMATRIX_TYPE_MATRIX, inputParameters);
break;
}
case FilterOperation::SATURATE: {
Vector<float> inputParameters;
inputParameters.append(narrowPrecisionToFloat(toBasicColorMatrixFilterOperation(filterOperation)->amount()));
effect = FEColorMatrix::create(parentFilter.get(), FECOLORMATRIX_TYPE_SATURATE, inputParameters);
break;
}
case FilterOperation::HUE_ROTATE: {
Vector<float> inputParameters;
inputParameters.append(narrowPrecisionToFloat(toBasicColorMatrixFilterOperation(filterOperation)->amount()));
effect = FEColorMatrix::create(parentFilter.get(), FECOLORMATRIX_TYPE_HUEROTATE, inputParameters);
break;
}
case FilterOperation::INVERT: {
BasicComponentTransferFilterOperation* componentTransferOperation = toBasicComponentTransferFilterOperation(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(parentFilter.get(), transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::OPACITY: {
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_TABLE;
Vector<float> transferParameters;
transferParameters.append(0);
transferParameters.append(narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount()));
transferFunction.tableValues = transferParameters;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(parentFilter.get(), nullFunction, nullFunction, nullFunction, transferFunction);
break;
}
case FilterOperation::BRIGHTNESS: {
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR;
transferFunction.slope = narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount());
transferFunction.intercept = 0;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(parentFilter.get(), transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::CONTRAST: {
ComponentTransferFunction transferFunction;
transferFunction.type = FECOMPONENTTRANSFER_TYPE_LINEAR;
float amount = narrowPrecisionToFloat(toBasicComponentTransferFilterOperation(filterOperation)->amount());
transferFunction.slope = amount;
transferFunction.intercept = -0.5 * amount + 0.5;
ComponentTransferFunction nullFunction;
effect = FEComponentTransfer::create(parentFilter.get(), transferFunction, transferFunction, transferFunction, nullFunction);
break;
}
case FilterOperation::BLUR: {
float stdDeviation = floatValueForLength(toBlurFilterOperation(filterOperation)->stdDeviation(), 0);
effect = FEGaussianBlur::create(parentFilter.get(), stdDeviation, stdDeviation);
break;
}
case FilterOperation::DROP_SHADOW: {
DropShadowFilterOperation* dropShadowOperation = toDropShadowFilterOperation(filterOperation);
float stdDeviation = dropShadowOperation->stdDeviation();
float x = dropShadowOperation->x();
float y = dropShadowOperation->y();
effect = FEDropShadow::create(parentFilter.get(), stdDeviation, stdDeviation, x, y, dropShadowOperation->color(), 1);
break;
}
default:
break;
}
if (effect) {
if (filterOperation->type() != FilterOperation::REFERENCE) {
// Unlike SVG, filters applied here should not clip to their primitive subregions.
effect->setClipsToBounds(false);
effect->setOperatingColorSpace(ColorSpaceDeviceRGB);
effect->inputEffects().append(previousEffect);
}
previousEffect = effect.release();
}
}
m_referenceFilters.append(parentFilter);
// We need to keep the old effects alive until this point, so that SVG reference filters
// can share cached resources across frames.
m_lastEffect = previousEffect;
// If we didn't make any effects, tell our caller we are not valid
if (!m_lastEffect.get())
return false;
return true;
}
void FilterEffectRenderer::clearIntermediateResults()
{
if (m_lastEffect.get())
m_lastEffect->clearResultsRecursive();
}
bool FilterEffectRenderer::beginFilterEffect(GraphicsContext* context, const FloatRect& filterBoxRect)
{
SkiaImageFilterBuilder builder(context);
m_lastEffect->determineFilterPrimitiveSubregion(MapRectForward);
RefPtr<ImageFilter> imageFilter = builder.build(m_lastEffect.get(), ColorSpaceDeviceRGB);
if (!imageFilter)
return false;
context->save();
FloatRect boundaries = mapImageFilterRect(imageFilter.get(), filterBoxRect);
context->translate(filterBoxRect.x(), filterBoxRect.y());
boundaries.move(-filterBoxRect.x(), -filterBoxRect.y());
context->beginLayer(1, CompositeSourceOver, &boundaries, ColorFilterNone, imageFilter.get());
context->translate(-filterBoxRect.x(), -filterBoxRect.y());
return true;
}
void FilterEffectRenderer::endFilterEffect(GraphicsContext* context)
{
context->endLayer();
context->restore();
}
} // namespace blink