Source/core/platform/graphics/filters/SkiaImageFilterBuilder.cpp - platform/external/chromium_org/third_party/WebKit - Git at Google

 /*
  * Copyright (C) 2012 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 AND ITS CONTRIBUTORS "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 OR ITS 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/platform/graphics/filters/SkiaImageFilterBuilder.h"

 #include "SkBlurImageFilter.h"
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkDropShadowImageFilter.h"
 #include "SkTableColorFilter.h"
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/filters/FilterEffect.h"
 #include "core/platform/graphics/filters/FilterOperations.h"
 #include "core/platform/graphics/filters/SourceGraphic.h"

 namespace {

 void getBrightnessMatrix(float amount, SkScalar matrix[20])
 {
     memset(matrix, 0, 20 * sizeof(SkScalar));
     matrix[0] = matrix[6] = matrix[12] = amount;
     matrix[18] = 1;
 }

 void getContrastMatrix(float amount, SkScalar matrix[20])
 {
     memset(matrix, 0, 20 * sizeof(SkScalar));
     matrix[0] = matrix[6] = matrix[12] = amount;
     matrix[4] = matrix[9] = matrix[14] = (-0.5f * amount + 0.5f) * 255;
     matrix[18] = 1;
 }

 void getSaturateMatrix(float amount, SkScalar matrix[20])
 {
     // Note, these values are computed to ensure matrixNeedsClamping is false
     // for amount in [0..1]
     matrix[0] = 0.213f + 0.787f * amount;
     matrix[1] = 0.715f - 0.715f * amount;
     matrix[2] = 1.f - (matrix[0] + matrix[1]);
     matrix[3] = matrix[4] = 0;
     matrix[5] = 0.213f - 0.213f * amount;
     matrix[6] = 0.715f + 0.285f * amount;
     matrix[7] = 1.f - (matrix[5] + matrix[6]);
     matrix[8] = matrix[9] = 0;
     matrix[10] = 0.213f - 0.213f * amount;
     matrix[11] = 0.715f - 0.715f * amount;
     matrix[12] = 1.f - (matrix[10] + matrix[11]);
     matrix[13] = matrix[14] = 0;
     matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
     matrix[18] = 1;
 }

 void getHueRotateMatrix(float hue, SkScalar matrix[20])
 {
     float cosHue = cosf(hue * piFloat / 180);
     float sinHue = sinf(hue * piFloat / 180);
     matrix[0] = 0.213f + cosHue * 0.787f - sinHue * 0.213f;
     matrix[1] = 0.715f - cosHue * 0.715f - sinHue * 0.715f;
     matrix[2] = 0.072f - cosHue * 0.072f + sinHue * 0.928f;
     matrix[3] = matrix[4] = 0;
     matrix[5] = 0.213f - cosHue * 0.213f + sinHue * 0.143f;
     matrix[6] = 0.715f + cosHue * 0.285f + sinHue * 0.140f;
     matrix[7] = 0.072f - cosHue * 0.072f - sinHue * 0.283f;
     matrix[8] = matrix[9] = 0;
     matrix[10] = 0.213f - cosHue * 0.213f - sinHue * 0.787f;
     matrix[11] = 0.715f - cosHue * 0.715f + sinHue * 0.715f;
     matrix[12] = 0.072f + cosHue * 0.928f + sinHue * 0.072f;
     matrix[13] = matrix[14] = 0;
     matrix[15] = matrix[16] = matrix[17] = 0;
     matrix[18] = 1;
     matrix[19] = 0;
 }

 void getInvertMatrix(float amount, SkScalar matrix[20])
 {
     memset(matrix, 0, 20 * sizeof(SkScalar));
     matrix[0] = matrix[6] = matrix[12] = 1 - 2 * amount;
     matrix[4] = matrix[9] = matrix[14] = amount * 255;
     matrix[18] = 1;
 }

 void getOpacityMatrix(float amount, SkScalar matrix[20])
 {
     memset(matrix, 0, 20 * sizeof(SkScalar));
     matrix[0] = matrix[6] = matrix[12] = 1;
     matrix[18] = amount;
 }

 void getGrayscaleMatrix(float amount, SkScalar matrix[20])
 {
     // Note, these values are computed to ensure matrixNeedsClamping is false
     // for amount in [0..1]
     matrix[0] = 0.2126f + 0.7874f * amount;
     matrix[1] = 0.7152f - 0.7152f * amount;
     matrix[2] = 1.f - (matrix[0] + matrix[1]);
     matrix[3] = matrix[4] = 0;

     matrix[5] = 0.2126f - 0.2126f * amount;
     matrix[6] = 0.7152f + 0.2848f * amount;
     matrix[7] = 1.f - (matrix[5] + matrix[6]);
     matrix[8] = matrix[9] = 0;

     matrix[10] = 0.2126f - 0.2126f * amount;
     matrix[11] = 0.7152f - 0.7152f * amount;
     matrix[12] = 1.f - (matrix[10] + matrix[11]);
     matrix[13] = matrix[14] = 0;

     matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
     matrix[18] = 1;
 }

 void getSepiaMatrix(float amount, SkScalar matrix[20])
 {
     matrix[0] = 0.393f + 0.607f * amount;
     matrix[1] = 0.769f - 0.769f * amount;
     matrix[2] = 0.189f - 0.189f * amount;
     matrix[3] = matrix[4] = 0;

     matrix[5] = 0.349f - 0.349f * amount;
     matrix[6] = 0.686f + 0.314f * amount;
     matrix[7] = 0.168f - 0.168f * amount;
     matrix[8] = matrix[9] = 0;

     matrix[10] = 0.272f - 0.272f * amount;
     matrix[11] = 0.534f - 0.534f * amount;
     matrix[12] = 0.131f + 0.869f * amount;
     matrix[13] = matrix[14] = 0;

     matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
     matrix[18] = 1;
 }

 PassRefPtr<SkImageFilter> createMatrixImageFilter(SkScalar matrix[20], SkImageFilter* input)
 {
     RefPtr<SkColorFilter> colorFilter(adoptRef(new SkColorMatrixFilter(matrix)));
     return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get(), input));
 }

 };

 namespace WebCore {

 SkiaImageFilterBuilder::SkiaImageFilterBuilder()
 {
 }

 SkiaImageFilterBuilder::~SkiaImageFilterBuilder()
 {
 }

 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::build(FilterEffect* effect, ColorSpace colorSpace)
 {
     if (!effect)
         return 0;

     FilterColorSpacePair key(effect, colorSpace);
     FilterBuilderHashMap::iterator it = m_map.find(key);
     if (it != m_map.end()) {
         return it->value;
     } else {
         // Note that we may still need the color transform even if the filter is null
         RefPtr<SkImageFilter> origFilter = effect->createImageFilter(this);
         RefPtr<SkImageFilter> filter = transformColorSpace(origFilter.get(), effect->operatingColorSpace(), colorSpace);
         m_map.set(key, filter);
         return filter.release();
     }
 }

 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::transformColorSpace(
     SkImageFilter* input, ColorSpace srcColorSpace, ColorSpace dstColorSpace) {

     RefPtr<SkColorFilter> colorFilter = ImageBuffer::createColorSpaceFilter(srcColorSpace, dstColorSpace);
     if (!colorFilter)
         return input;

     return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get(), input));
 }

 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::build(const FilterOperations& operations)
 {
     RefPtr<SkImageFilter> filter;
     SkScalar matrix[20];
     ColorSpace currentColorSpace = ColorSpaceDeviceRGB;
     for (size_t i = 0; i < operations.size(); ++i) {
         const FilterOperation& op = *operations.at(i);
         switch (op.getOperationType()) {
         case FilterOperation::REFERENCE: {
             const ReferenceFilterOperation* referenceFilterOperation = static_cast<const ReferenceFilterOperation*>(&op);
             ReferenceFilter* referenceFilter = referenceFilterOperation->filter();
             if (referenceFilter && referenceFilter->lastEffect()) {
                 FilterEffect* filterEffect = referenceFilter->lastEffect();
                 // Link SourceGraphic to the previous filter in the chain.
                 // We don't know what color space the interior nodes will request, so we have to populate the map with both options.
                 // (Only one of these will actually have a color transform on it.)
                 FilterColorSpacePair deviceKey(referenceFilter->sourceGraphic(), ColorSpaceDeviceRGB);
                 FilterColorSpacePair linearKey(referenceFilter->sourceGraphic(), ColorSpaceLinearRGB);
                 m_map.set(deviceKey, transformColorSpace(filter.get(), currentColorSpace, ColorSpaceDeviceRGB));
                 m_map.set(linearKey, transformColorSpace(filter.get(), currentColorSpace, ColorSpaceLinearRGB));

                 currentColorSpace = filterEffect->operatingColorSpace();
                 filter = SkiaImageFilterBuilder::build(filterEffect, currentColorSpace);
                 // We might have no reference to the SourceGraphic's Skia filter now, so make
                 // sure we don't keep it in the map anymore.
                 m_map.remove(deviceKey);
                 m_map.remove(linearKey);
             }
             break;
         }
         case FilterOperation::GRAYSCALE: {
             float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
             getGrayscaleMatrix(1 - amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::SEPIA: {
             float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
             getSepiaMatrix(1 - amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::SATURATE: {
             float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
             getSaturateMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::HUE_ROTATE: {
             float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
             getHueRotateMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::INVERT: {
             float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
             getInvertMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::OPACITY: {
             float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
             getOpacityMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::BRIGHTNESS: {
             float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
             getBrightnessMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::CONTRAST: {
             float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
             getContrastMatrix(amount, matrix);
             filter = createMatrixImageFilter(matrix, filter.get());
             break;
         }
         case FilterOperation::BLUR: {
             float pixelRadius = static_cast<const BlurFilterOperation*>(&op)->stdDeviation().getFloatValue();
             filter = adoptRef(new SkBlurImageFilter(pixelRadius, pixelRadius, filter.get()));
             break;
         }
         case FilterOperation::DROP_SHADOW: {
             const DropShadowFilterOperation* drop = static_cast<const DropShadowFilterOperation*>(&op);
             filter = adoptRef(new SkDropShadowImageFilter(SkIntToScalar(drop->x()), SkIntToScalar(drop->y()), SkIntToScalar(drop->stdDeviation()), drop->color().rgb(), filter.get()));
             break;
         }
         case FilterOperation::VALIDATED_CUSTOM:
         case FilterOperation::CUSTOM:
             // Not supported.
         case FilterOperation::PASSTHROUGH:
         case FilterOperation::NONE:
             break;
         }
     }
     if (currentColorSpace != ColorSpaceDeviceRGB) {
         // Transform to device color space at the end of processing, if required
         filter = transformColorSpace(filter.get(), currentColorSpace, ColorSpaceDeviceRGB);
     }
     return filter.release();
 }

 };
	/*
	* Copyright (C) 2012 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 AND ITS CONTRIBUTORS "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 OR ITS 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/platform/graphics/filters/SkiaImageFilterBuilder.h"

	#include "SkBlurImageFilter.h"
	#include "SkColorFilterImageFilter.h"
	#include "SkColorMatrixFilter.h"
	#include "SkDropShadowImageFilter.h"
	#include "SkTableColorFilter.h"
	#include "core/platform/graphics/ImageBuffer.h"
	#include "core/platform/graphics/filters/FilterEffect.h"
	#include "core/platform/graphics/filters/FilterOperations.h"
	#include "core/platform/graphics/filters/SourceGraphic.h"

	namespace {

	void getBrightnessMatrix(float amount, SkScalar matrix[20])
	{
	memset(matrix, 0, 20 * sizeof(SkScalar));
	matrix[0] = matrix[6] = matrix[12] = amount;
	matrix[18] = 1;
	}

	void getContrastMatrix(float amount, SkScalar matrix[20])
	{
	memset(matrix, 0, 20 * sizeof(SkScalar));
	matrix[0] = matrix[6] = matrix[12] = amount;
	matrix[4] = matrix[9] = matrix[14] = (-0.5f * amount + 0.5f) * 255;
	matrix[18] = 1;
	}

	void getSaturateMatrix(float amount, SkScalar matrix[20])
	{
	// Note, these values are computed to ensure matrixNeedsClamping is false
	// for amount in [0..1]
	matrix[0] = 0.213f + 0.787f * amount;
	matrix[1] = 0.715f - 0.715f * amount;
	matrix[2] = 1.f - (matrix[0] + matrix[1]);
	matrix[3] = matrix[4] = 0;
	matrix[5] = 0.213f - 0.213f * amount;
	matrix[6] = 0.715f + 0.285f * amount;
	matrix[7] = 1.f - (matrix[5] + matrix[6]);
	matrix[8] = matrix[9] = 0;
	matrix[10] = 0.213f - 0.213f * amount;
	matrix[11] = 0.715f - 0.715f * amount;
	matrix[12] = 1.f - (matrix[10] + matrix[11]);
	matrix[13] = matrix[14] = 0;
	matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
	matrix[18] = 1;
	}

	void getHueRotateMatrix(float hue, SkScalar matrix[20])
	{
	float cosHue = cosf(hue * piFloat / 180);
	float sinHue = sinf(hue * piFloat / 180);
	matrix[0] = 0.213f + cosHue * 0.787f - sinHue * 0.213f;
	matrix[1] = 0.715f - cosHue * 0.715f - sinHue * 0.715f;
	matrix[2] = 0.072f - cosHue * 0.072f + sinHue * 0.928f;
	matrix[3] = matrix[4] = 0;
	matrix[5] = 0.213f - cosHue * 0.213f + sinHue * 0.143f;
	matrix[6] = 0.715f + cosHue * 0.285f + sinHue * 0.140f;
	matrix[7] = 0.072f - cosHue * 0.072f - sinHue * 0.283f;
	matrix[8] = matrix[9] = 0;
	matrix[10] = 0.213f - cosHue * 0.213f - sinHue * 0.787f;
	matrix[11] = 0.715f - cosHue * 0.715f + sinHue * 0.715f;
	matrix[12] = 0.072f + cosHue * 0.928f + sinHue * 0.072f;
	matrix[13] = matrix[14] = 0;
	matrix[15] = matrix[16] = matrix[17] = 0;
	matrix[18] = 1;
	matrix[19] = 0;
	}

	void getInvertMatrix(float amount, SkScalar matrix[20])
	{
	memset(matrix, 0, 20 * sizeof(SkScalar));
	matrix[0] = matrix[6] = matrix[12] = 1 - 2 * amount;
	matrix[4] = matrix[9] = matrix[14] = amount * 255;
	matrix[18] = 1;
	}

	void getOpacityMatrix(float amount, SkScalar matrix[20])
	{
	memset(matrix, 0, 20 * sizeof(SkScalar));
	matrix[0] = matrix[6] = matrix[12] = 1;
	matrix[18] = amount;
	}

	void getGrayscaleMatrix(float amount, SkScalar matrix[20])
	{
	// Note, these values are computed to ensure matrixNeedsClamping is false
	// for amount in [0..1]
	matrix[0] = 0.2126f + 0.7874f * amount;
	matrix[1] = 0.7152f - 0.7152f * amount;
	matrix[2] = 1.f - (matrix[0] + matrix[1]);
	matrix[3] = matrix[4] = 0;

	matrix[5] = 0.2126f - 0.2126f * amount;
	matrix[6] = 0.7152f + 0.2848f * amount;
	matrix[7] = 1.f - (matrix[5] + matrix[6]);
	matrix[8] = matrix[9] = 0;

	matrix[10] = 0.2126f - 0.2126f * amount;
	matrix[11] = 0.7152f - 0.7152f * amount;
	matrix[12] = 1.f - (matrix[10] + matrix[11]);
	matrix[13] = matrix[14] = 0;

	matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
	matrix[18] = 1;
	}

	void getSepiaMatrix(float amount, SkScalar matrix[20])
	{
	matrix[0] = 0.393f + 0.607f * amount;
	matrix[1] = 0.769f - 0.769f * amount;
	matrix[2] = 0.189f - 0.189f * amount;
	matrix[3] = matrix[4] = 0;

	matrix[5] = 0.349f - 0.349f * amount;
	matrix[6] = 0.686f + 0.314f * amount;
	matrix[7] = 0.168f - 0.168f * amount;
	matrix[8] = matrix[9] = 0;

	matrix[10] = 0.272f - 0.272f * amount;
	matrix[11] = 0.534f - 0.534f * amount;
	matrix[12] = 0.131f + 0.869f * amount;
	matrix[13] = matrix[14] = 0;

	matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0;
	matrix[18] = 1;
	}

	PassRefPtr<SkImageFilter> createMatrixImageFilter(SkScalar matrix[20], SkImageFilter* input)
	{
	RefPtr<SkColorFilter> colorFilter(adoptRef(new SkColorMatrixFilter(matrix)));
	return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get(), input));
	}

	};

	namespace WebCore {

	SkiaImageFilterBuilder::SkiaImageFilterBuilder()
	{
	}

	SkiaImageFilterBuilder::~SkiaImageFilterBuilder()
	{
	}

	PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::build(FilterEffect* effect, ColorSpace colorSpace)
	{
	if (!effect)
	return 0;

	FilterColorSpacePair key(effect, colorSpace);
	FilterBuilderHashMap::iterator it = m_map.find(key);
	if (it != m_map.end()) {
	return it->value;
	} else {
	// Note that we may still need the color transform even if the filter is null
	RefPtr<SkImageFilter> origFilter = effect->createImageFilter(this);
	RefPtr<SkImageFilter> filter = transformColorSpace(origFilter.get(), effect->operatingColorSpace(), colorSpace);
	m_map.set(key, filter);
	return filter.release();
	}
	}

	PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::transformColorSpace(
	SkImageFilter* input, ColorSpace srcColorSpace, ColorSpace dstColorSpace) {

	RefPtr<SkColorFilter> colorFilter = ImageBuffer::createColorSpaceFilter(srcColorSpace, dstColorSpace);
	if (!colorFilter)
	return input;

	return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get(), input));
	}

	PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::build(const FilterOperations& operations)
	{
	RefPtr<SkImageFilter> filter;
	SkScalar matrix[20];
	ColorSpace currentColorSpace = ColorSpaceDeviceRGB;
	for (size_t i = 0; i < operations.size(); ++i) {
	const FilterOperation& op = *operations.at(i);
	switch (op.getOperationType()) {
	case FilterOperation::REFERENCE: {
	const ReferenceFilterOperation* referenceFilterOperation = static_cast<const ReferenceFilterOperation*>(&op);
	ReferenceFilter* referenceFilter = referenceFilterOperation->filter();
	if (referenceFilter && referenceFilter->lastEffect()) {
	FilterEffect* filterEffect = referenceFilter->lastEffect();
	// Link SourceGraphic to the previous filter in the chain.
	// We don't know what color space the interior nodes will request, so we have to populate the map with both options.
	// (Only one of these will actually have a color transform on it.)
	FilterColorSpacePair deviceKey(referenceFilter->sourceGraphic(), ColorSpaceDeviceRGB);
	FilterColorSpacePair linearKey(referenceFilter->sourceGraphic(), ColorSpaceLinearRGB);
	m_map.set(deviceKey, transformColorSpace(filter.get(), currentColorSpace, ColorSpaceDeviceRGB));
	m_map.set(linearKey, transformColorSpace(filter.get(), currentColorSpace, ColorSpaceLinearRGB));

	currentColorSpace = filterEffect->operatingColorSpace();
	filter = SkiaImageFilterBuilder::build(filterEffect, currentColorSpace);
	// We might have no reference to the SourceGraphic's Skia filter now, so make
	// sure we don't keep it in the map anymore.
	m_map.remove(deviceKey);
	m_map.remove(linearKey);
	}
	break;
	}
	case FilterOperation::GRAYSCALE: {
	float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
	getGrayscaleMatrix(1 - amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::SEPIA: {
	float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
	getSepiaMatrix(1 - amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::SATURATE: {
	float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
	getSaturateMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::HUE_ROTATE: {
	float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
	getHueRotateMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::INVERT: {
	float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
	getInvertMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::OPACITY: {
	float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
	getOpacityMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::BRIGHTNESS: {
	float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
	getBrightnessMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::CONTRAST: {
	float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
	getContrastMatrix(amount, matrix);
	filter = createMatrixImageFilter(matrix, filter.get());
	break;
	}
	case FilterOperation::BLUR: {
	float pixelRadius = static_cast<const BlurFilterOperation*>(&op)->stdDeviation().getFloatValue();
	filter = adoptRef(new SkBlurImageFilter(pixelRadius, pixelRadius, filter.get()));
	break;
	}
	case FilterOperation::DROP_SHADOW: {
	const DropShadowFilterOperation* drop = static_cast<const DropShadowFilterOperation*>(&op);
	filter = adoptRef(new SkDropShadowImageFilter(SkIntToScalar(drop->x()), SkIntToScalar(drop->y()), SkIntToScalar(drop->stdDeviation()), drop->color().rgb(), filter.get()));
	break;
	}
	case FilterOperation::VALIDATED_CUSTOM:
	case FilterOperation::CUSTOM:
	// Not supported.
	case FilterOperation::PASSTHROUGH:
	case FilterOperation::NONE:
	break;
	}
	}
	if (currentColorSpace != ColorSpaceDeviceRGB) {
	// Transform to device color space at the end of processing, if required
	filter = transformColorSpace(filter.get(), currentColorSpace, ColorSpaceDeviceRGB);
	}
	return filter.release();
	}

	};