third_party/WebKit/Source/platform/graphics/filters/ImageFilterBuilderTest.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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#include "SkImageFilter.h"
#include "platform/graphics/filters/FEBlend.h"
#include "platform/graphics/filters/FEGaussianBlur.h"
#include "platform/graphics/filters/FEMerge.h"
#include "platform/graphics/filters/Filter.h"
#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
#include "platform/graphics/filters/SourceGraphic.h"
#include "testing/gtest/include/gtest/gtest.h"

using testing::Test;

namespace blink {

class ImageFilterBuilderTest : public Test {
 protected:
  void colorSpaceTest() {
    // Build filter tree
    Filter* referenceFilter = Filter::create(1.0f);

    // Add a dummy source graphic input
    FilterEffect* sourceEffect = referenceFilter->getSourceGraphic();
    sourceEffect->setOperatingColorSpace(ColorSpaceDeviceRGB);

    // Add a blur effect (with input : source)
    FilterEffect* blurEffect =
        FEGaussianBlur::create(referenceFilter, 3.0f, 3.0f);
    blurEffect->setOperatingColorSpace(ColorSpaceLinearRGB);
    blurEffect->inputEffects().append(sourceEffect);

    // Add a blend effect (with inputs : blur, source)
    FilterEffect* blendEffect =
        FEBlend::create(referenceFilter, WebBlendModeNormal);
    blendEffect->setOperatingColorSpace(ColorSpaceDeviceRGB);
    FilterEffectVector& blendInputs = blendEffect->inputEffects();
    blendInputs.reserveCapacity(2);
    blendInputs.append(sourceEffect);
    blendInputs.append(blurEffect);

    // Add a merge effect (with inputs : blur, blend)
    FilterEffect* mergeEffect = FEMerge::create(referenceFilter);
    mergeEffect->setOperatingColorSpace(ColorSpaceLinearRGB);
    FilterEffectVector& mergeInputs = mergeEffect->inputEffects();
    mergeInputs.reserveCapacity(2);
    mergeInputs.append(blurEffect);
    mergeInputs.append(blendEffect);
    referenceFilter->setLastEffect(mergeEffect);

    // Get SkImageFilter resulting tree
    sk_sp<SkImageFilter> filter = SkiaImageFilterBuilder::build(
        referenceFilter->lastEffect(), ColorSpaceDeviceRGB);

    // Let's check that the resulting tree looks like this :
    //      ColorSpace (Linear->Device) : CS (L->D)
    //                |
    //             Merge (L)
    //              |     |
    //              |    CS (D->L)
    //              |          |
    //              |      Blend (D)
    //              |       /    |
    //              |  CS (L->D) |
    //              |  /         |
    //             Blur (L)      |
    //                 \         |
    //               CS (D->L)   |
    //                   \       |
    //                 Source Graphic (D)

    EXPECT_EQ(filter->countInputs(), 1);         // Should be CS (L->D)
    SkImageFilter* child = filter->getInput(0);  // Should be Merge
    EXPECT_EQ(child->asColorFilter(0), false);
    EXPECT_EQ(child->countInputs(), 2);
    child = child->getInput(1);  // Should be CS (D->L)
    EXPECT_EQ(child->asColorFilter(0), true);
    EXPECT_EQ(child->countInputs(), 1);
    child = child->getInput(0);  // Should be Blend
    EXPECT_EQ(child->asColorFilter(0), false);
    EXPECT_EQ(child->countInputs(), 2);
    child = child->getInput(0);  // Should be CS (L->D)
    EXPECT_EQ(child->asColorFilter(0), true);
    EXPECT_EQ(child->countInputs(), 1);
    child = child->getInput(0);  // Should be Blur
    EXPECT_EQ(child->asColorFilter(0), false);
    EXPECT_EQ(child->countInputs(), 1);
    child = child->getInput(0);  // Should be CS (D->L)
    EXPECT_EQ(child->asColorFilter(0), true);
    EXPECT_EQ(child->countInputs(), 1);
  }
};

TEST_F(ImageFilterBuilderTest, testColorSpace) {
  colorSpaceTest();
}

}  // namespace blink