1 /*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25 #include "config.h"
26
27 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
28
29 #include "SkBlurImageFilter.h"
30 #include "SkColorFilterImageFilter.h"
31 #include "SkColorMatrixFilter.h"
32 #include "SkDropShadowImageFilter.h"
33 #include "SkMatrixImageFilter.h"
34 #include "SkTableColorFilter.h"
35 #include "platform/graphics/ImageBuffer.h"
36 #include "platform/graphics/filters/FilterEffect.h"
37 #include "platform/graphics/filters/FilterOperations.h"
38 #include "platform/graphics/filters/SourceGraphic.h"
39 #include "platform/graphics/skia/SkiaUtils.h"
40 #include "public/platform/WebPoint.h"
41
42 namespace blink {
43
SkiaImageFilterBuilder()44 SkiaImageFilterBuilder::SkiaImageFilterBuilder()
45 : m_context(0)
46 , m_sourceGraphic(0)
47 {
48 }
49
SkiaImageFilterBuilder(GraphicsContext * context)50 SkiaImageFilterBuilder::SkiaImageFilterBuilder(GraphicsContext* context)
51 : m_context(context)
52 , m_sourceGraphic(0)
53 {
54 }
55
~SkiaImageFilterBuilder()56 SkiaImageFilterBuilder::~SkiaImageFilterBuilder()
57 {
58 }
59
build(FilterEffect * effect,ColorSpace colorSpace,bool destinationRequiresValidPreMultipliedPixels)60 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::build(FilterEffect* effect, ColorSpace colorSpace, bool destinationRequiresValidPreMultipliedPixels)
61 {
62 if (!effect)
63 return nullptr;
64
65 bool requiresPMColorValidation = effect->mayProduceInvalidPreMultipliedPixels() && destinationRequiresValidPreMultipliedPixels;
66
67 if (SkImageFilter* filter = effect->getImageFilter(colorSpace, requiresPMColorValidation))
68 return filter;
69
70 // Note that we may still need the color transform even if the filter is null
71 RefPtr<SkImageFilter> origFilter = requiresPMColorValidation ? effect->createImageFilter(this) : effect->createImageFilterWithoutValidation(this);
72 RefPtr<SkImageFilter> filter = transformColorSpace(origFilter.get(), effect->operatingColorSpace(), colorSpace);
73 effect->setImageFilter(colorSpace, requiresPMColorValidation, filter.get());
74 if (filter.get() != origFilter.get())
75 effect->setImageFilter(effect->operatingColorSpace(), requiresPMColorValidation, origFilter.get());
76 return filter.release();
77 }
78
transformColorSpace(SkImageFilter * input,ColorSpace srcColorSpace,ColorSpace dstColorSpace)79 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::transformColorSpace(
80 SkImageFilter* input, ColorSpace srcColorSpace, ColorSpace dstColorSpace) {
81
82 RefPtr<SkColorFilter> colorFilter = ImageBuffer::createColorSpaceFilter(srcColorSpace, dstColorSpace);
83 if (!colorFilter)
84 return input;
85
86 return adoptRef(SkColorFilterImageFilter::Create(colorFilter.get(), input));
87 }
88
buildFilterOperations(const FilterOperations & operations,WebFilterOperations * filters)89 void SkiaImageFilterBuilder::buildFilterOperations(const FilterOperations& operations, WebFilterOperations* filters)
90 {
91 ColorSpace currentColorSpace = ColorSpaceDeviceRGB;
92 SkImageFilter* const nullFilter = 0;
93
94 for (size_t i = 0; i < operations.size(); ++i) {
95 const FilterOperation& op = *operations.at(i);
96 switch (op.type()) {
97 case FilterOperation::REFERENCE: {
98 RefPtr<SkImageFilter> filter;
99 ReferenceFilter* referenceFilter = toReferenceFilterOperation(op).filter();
100 if (referenceFilter && referenceFilter->lastEffect()) {
101 FilterEffect* filterEffect = referenceFilter->lastEffect();
102 // Prepopulate SourceGraphic with two image filters: one with a null image
103 // filter, and the other with a colorspace conversion filter.
104 // We don't know what color space the interior nodes will request, so we have to
105 // initialize SourceGraphic with both options.
106 // Since we know SourceGraphic is always PM-valid, we also use
107 // these for the PM-validated options.
108 RefPtr<SkImageFilter> deviceFilter = transformColorSpace(nullFilter, currentColorSpace, ColorSpaceDeviceRGB);
109 RefPtr<SkImageFilter> linearFilter = transformColorSpace(nullFilter, currentColorSpace, ColorSpaceLinearRGB);
110 FilterEffect* sourceGraphic = referenceFilter->sourceGraphic();
111 sourceGraphic->setImageFilter(ColorSpaceDeviceRGB, false, deviceFilter.get());
112 sourceGraphic->setImageFilter(ColorSpaceLinearRGB, false, linearFilter.get());
113 sourceGraphic->setImageFilter(ColorSpaceDeviceRGB, true, deviceFilter.get());
114 sourceGraphic->setImageFilter(ColorSpaceLinearRGB, true, linearFilter.get());
115
116 currentColorSpace = filterEffect->operatingColorSpace();
117 filter = SkiaImageFilterBuilder::build(filterEffect, currentColorSpace);
118 filters->appendReferenceFilter(filter.get());
119 }
120 break;
121 }
122 case FilterOperation::GRAYSCALE:
123 case FilterOperation::SEPIA:
124 case FilterOperation::SATURATE:
125 case FilterOperation::HUE_ROTATE: {
126 float amount = toBasicColorMatrixFilterOperation(op).amount();
127 switch (op.type()) {
128 case FilterOperation::GRAYSCALE:
129 filters->appendGrayscaleFilter(amount);
130 break;
131 case FilterOperation::SEPIA:
132 filters->appendSepiaFilter(amount);
133 break;
134 case FilterOperation::SATURATE:
135 filters->appendSaturateFilter(amount);
136 break;
137 case FilterOperation::HUE_ROTATE:
138 filters->appendHueRotateFilter(amount);
139 break;
140 default:
141 ASSERT_NOT_REACHED();
142 }
143 break;
144 }
145 case FilterOperation::INVERT:
146 case FilterOperation::OPACITY:
147 case FilterOperation::BRIGHTNESS:
148 case FilterOperation::CONTRAST: {
149 float amount = toBasicComponentTransferFilterOperation(op).amount();
150 switch (op.type()) {
151 case FilterOperation::INVERT:
152 filters->appendInvertFilter(amount);
153 break;
154 case FilterOperation::OPACITY:
155 filters->appendOpacityFilter(amount);
156 break;
157 case FilterOperation::BRIGHTNESS:
158 filters->appendBrightnessFilter(amount);
159 break;
160 case FilterOperation::CONTRAST:
161 filters->appendContrastFilter(amount);
162 break;
163 default:
164 ASSERT_NOT_REACHED();
165 }
166 break;
167 }
168 case FilterOperation::BLUR: {
169 float pixelRadius = toBlurFilterOperation(op).stdDeviation().getFloatValue();
170 filters->appendBlurFilter(pixelRadius);
171 break;
172 }
173 case FilterOperation::DROP_SHADOW: {
174 const DropShadowFilterOperation& drop = toDropShadowFilterOperation(op);
175 filters->appendDropShadowFilter(WebPoint(drop.x(), drop.y()), drop.stdDeviation(), drop.color().rgb());
176 break;
177 }
178 case FilterOperation::NONE:
179 break;
180 }
181 }
182 if (currentColorSpace != ColorSpaceDeviceRGB) {
183 // Transform to device color space at the end of processing, if required
184 RefPtr<SkImageFilter> filter = transformColorSpace(nullFilter, currentColorSpace, ColorSpaceDeviceRGB);
185 filters->appendReferenceFilter(filter.get());
186 }
187 }
188
buildTransform(const AffineTransform & transform,SkImageFilter * input)189 PassRefPtr<SkImageFilter> SkiaImageFilterBuilder::buildTransform(const AffineTransform& transform, SkImageFilter* input)
190 {
191 return adoptRef(SkMatrixImageFilter::Create(affineTransformToSkMatrix(transform), SkPaint::kHigh_FilterLevel, input));
192 }
193
194 } // namespace blink
195