third_party/WebKit/Source/platform/image-decoders/ImageDecoderTest.cpp - chromium/src - Git at Google

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * 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.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
  * OWNER 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 "platform/image-decoders/ImageDecoder.h"

 #include "platform/image-decoders/ImageFrame.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/Vector.h"
 #include <memory>

 namespace blink {

 class TestImageDecoder : public ImageDecoder {
  public:
   TestImageDecoder()
       : ImageDecoder(AlphaNotPremultiplied,
                      GammaAndColorProfileApplied,
                      noDecodedImageByteLimit) {}

   String filenameExtension() const override { return ""; }

   Vector<ImageFrame, 1>& frameBufferCache() { return m_frameBufferCache; }

   void resetRequiredPreviousFrames(bool knownOpaque = false) {
     for (size_t i = 0; i < m_frameBufferCache.size(); ++i)
       m_frameBufferCache[i].setRequiredPreviousFrameIndex(
           findRequiredPreviousFrame(i, knownOpaque));
   }

   void initFrames(size_t numFrames,
                   unsigned width = 100,
                   unsigned height = 100) {
     setSize(width, height);
     m_frameBufferCache.resize(numFrames);
     for (size_t i = 0; i < numFrames; ++i)
       m_frameBufferCache[i].setOriginalFrameRect(IntRect(0, 0, width, height));
   }

  private:
   void decodeSize() override {}
   void decode(size_t index) override {}
 };

 TEST(ImageDecoderTest, sizeCalculationMayOverflow) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   EXPECT_FALSE(decoder->setSize(1 << 29, 1));
   EXPECT_FALSE(decoder->setSize(1, 1 << 29));
   EXPECT_FALSE(decoder->setSize(1 << 15, 1 << 15));
   EXPECT_TRUE(decoder->setSize(1 << 28, 1));
   EXPECT_TRUE(decoder->setSize(1, 1 << 28));
   EXPECT_TRUE(decoder->setSize(1 << 14, 1 << 14));
 }

 TEST(ImageDecoderTest, requiredPreviousFrameIndex) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(6);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

   frameBuffers[1].setDisposalMethod(ImageFrame::DisposeKeep);
   frameBuffers[2].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
   frameBuffers[3].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
   frameBuffers[4].setDisposalMethod(ImageFrame::DisposeKeep);

   decoder->resetRequiredPreviousFrames();

   // The first frame doesn't require any previous frame.
   EXPECT_EQ(kNotFound, frameBuffers[0].requiredPreviousFrameIndex());
   // The previous DisposeNotSpecified frame is required.
   EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());
   // DisposeKeep is treated as DisposeNotSpecified.
   EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
   // Previous DisposeOverwritePrevious frames are skipped.
   EXPECT_EQ(1u, frameBuffers[3].requiredPreviousFrameIndex());
   EXPECT_EQ(1u, frameBuffers[4].requiredPreviousFrameIndex());
   EXPECT_EQ(4u, frameBuffers[5].requiredPreviousFrameIndex());
 }

 TEST(ImageDecoderTest, requiredPreviousFrameIndexDisposeOverwriteBgcolor) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(3);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

   // Fully covering DisposeOverwriteBgcolor previous frame resets the starting
   // state.
   frameBuffers[1].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());

   // Partially covering DisposeOverwriteBgcolor previous frame is required by
   // this frame.
   frameBuffers[1].setOriginalFrameRect(IntRect(50, 50, 50, 50));
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
 }

 TEST(ImageDecoderTest, requiredPreviousFrameIndexForFrame1) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(2);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());

   // The first frame with DisposeOverwritePrevious or DisposeOverwriteBgcolor
   // resets the starting state.
   frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
   frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());

   // ... even if it partially covers.
   frameBuffers[0].setOriginalFrameRect(IntRect(50, 50, 50, 50));

   frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
   frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
   decoder->resetRequiredPreviousFrames();
   EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
 }

 TEST(ImageDecoderTest, requiredPreviousFrameIndexBlendAtopBgcolor) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(3);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

   frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));
   frameBuffers[2].setAlphaBlendSource(ImageFrame::BlendAtopBgcolor);

   // A full frame with 'blending method == BlendAtopBgcolor' doesn't depend on
   // any prior frames.
   for (int disposeMethod = ImageFrame::DisposeNotSpecified;
        disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
     frameBuffers[1].setDisposalMethod(
         static_cast<ImageFrame::DisposalMethod>(disposeMethod));
     decoder->resetRequiredPreviousFrames();
     EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
   }

   // A non-full frame with 'blending method == BlendAtopBgcolor' does depend on
   // a prior frame.
   frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
   for (int disposeMethod = ImageFrame::DisposeNotSpecified;
        disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
     frameBuffers[1].setDisposalMethod(
         static_cast<ImageFrame::DisposalMethod>(disposeMethod));
     decoder->resetRequiredPreviousFrames();
     EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
   }
 }

 TEST(ImageDecoderTest, requiredPreviousFrameIndexKnownOpaque) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(3);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

   frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));

   // A full frame that is known to be opaque doesn't depend on any prior frames.
   for (int disposeMethod = ImageFrame::DisposeNotSpecified;
        disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
     frameBuffers[1].setDisposalMethod(
         static_cast<ImageFrame::DisposalMethod>(disposeMethod));
     decoder->resetRequiredPreviousFrames(true);
     EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
   }

   // A non-full frame that is known to be opaque does depend on a prior frame.
   frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
   for (int disposeMethod = ImageFrame::DisposeNotSpecified;
        disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
     frameBuffers[1].setDisposalMethod(
         static_cast<ImageFrame::DisposalMethod>(disposeMethod));
     decoder->resetRequiredPreviousFrames(true);
     EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
   }
 }

 TEST(ImageDecoderTest, clearCacheExceptFrameDoNothing) {
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->clearCacheExceptFrame(0);

   // This should not crash.
   decoder->initFrames(20);
   decoder->clearCacheExceptFrame(kNotFound);
 }

 TEST(ImageDecoderTest, clearCacheExceptFrameAll) {
   const size_t numFrames = 10;
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(numFrames);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
   for (size_t i = 0; i < numFrames; ++i)
     frameBuffers[i].setStatus(i % 2 ? ImageFrame::FramePartial
                                     : ImageFrame::FrameComplete);

   decoder->clearCacheExceptFrame(kNotFound);

   for (size_t i = 0; i < numFrames; ++i) {
     SCOPED_TRACE(testing::Message() << i);
     EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].getStatus());
   }
 }

 TEST(ImageDecoderTest, clearCacheExceptFramePreverveClearExceptFrame) {
   const size_t numFrames = 10;
   std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
   decoder->initFrames(numFrames);
   Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
   for (size_t i = 0; i < numFrames; ++i)
     frameBuffers[i].setStatus(ImageFrame::FrameComplete);

   decoder->resetRequiredPreviousFrames();
   decoder->clearCacheExceptFrame(5);
   for (size_t i = 0; i < numFrames; ++i) {
     SCOPED_TRACE(testing::Message() << i);
     if (i == 5)
       EXPECT_EQ(ImageFrame::FrameComplete, frameBuffers[i].getStatus());
     else
       EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].getStatus());
   }
 }

 }  // namespace blink
	/*
	* 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:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * 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.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
	* OWNER 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 "platform/image-decoders/ImageDecoder.h"

	#include "platform/image-decoders/ImageFrame.h"
	#include "testing/gtest/include/gtest/gtest.h"
	#include "wtf/PtrUtil.h"
	#include "wtf/Vector.h"
	#include <memory>

	namespace blink {

	class TestImageDecoder : public ImageDecoder {
	public:
	TestImageDecoder()
	: ImageDecoder(AlphaNotPremultiplied,
	GammaAndColorProfileApplied,
	noDecodedImageByteLimit) {}

	String filenameExtension() const override { return ""; }

	Vector<ImageFrame, 1>& frameBufferCache() { return m_frameBufferCache; }

	void resetRequiredPreviousFrames(bool knownOpaque = false) {
	for (size_t i = 0; i < m_frameBufferCache.size(); ++i)
	m_frameBufferCache[i].setRequiredPreviousFrameIndex(
	findRequiredPreviousFrame(i, knownOpaque));
	}

	void initFrames(size_t numFrames,
	unsigned width = 100,
	unsigned height = 100) {
	setSize(width, height);
	m_frameBufferCache.resize(numFrames);
	for (size_t i = 0; i < numFrames; ++i)
	m_frameBufferCache[i].setOriginalFrameRect(IntRect(0, 0, width, height));
	}

	private:
	void decodeSize() override {}
	void decode(size_t index) override {}
	};

	TEST(ImageDecoderTest, sizeCalculationMayOverflow) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	EXPECT_FALSE(decoder->setSize(1 << 29, 1));
	EXPECT_FALSE(decoder->setSize(1, 1 << 29));
	EXPECT_FALSE(decoder->setSize(1 << 15, 1 << 15));
	EXPECT_TRUE(decoder->setSize(1 << 28, 1));
	EXPECT_TRUE(decoder->setSize(1, 1 << 28));
	EXPECT_TRUE(decoder->setSize(1 << 14, 1 << 14));
	}

	TEST(ImageDecoderTest, requiredPreviousFrameIndex) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(6);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

	frameBuffers[1].setDisposalMethod(ImageFrame::DisposeKeep);
	frameBuffers[2].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
	frameBuffers[3].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
	frameBuffers[4].setDisposalMethod(ImageFrame::DisposeKeep);

	decoder->resetRequiredPreviousFrames();

	// The first frame doesn't require any previous frame.
	EXPECT_EQ(kNotFound, frameBuffers[0].requiredPreviousFrameIndex());
	// The previous DisposeNotSpecified frame is required.
	EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());
	// DisposeKeep is treated as DisposeNotSpecified.
	EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
	// Previous DisposeOverwritePrevious frames are skipped.
	EXPECT_EQ(1u, frameBuffers[3].requiredPreviousFrameIndex());
	EXPECT_EQ(1u, frameBuffers[4].requiredPreviousFrameIndex());
	EXPECT_EQ(4u, frameBuffers[5].requiredPreviousFrameIndex());
	}

	TEST(ImageDecoderTest, requiredPreviousFrameIndexDisposeOverwriteBgcolor) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(3);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

	// Fully covering DisposeOverwriteBgcolor previous frame resets the starting
	// state.
	frameBuffers[1].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());

	// Partially covering DisposeOverwriteBgcolor previous frame is required by
	// this frame.
	frameBuffers[1].setOriginalFrameRect(IntRect(50, 50, 50, 50));
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(1u, frameBuffers[2].requiredPreviousFrameIndex());
	}

	TEST(ImageDecoderTest, requiredPreviousFrameIndexForFrame1) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(2);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(0u, frameBuffers[1].requiredPreviousFrameIndex());

	// The first frame with DisposeOverwritePrevious or DisposeOverwriteBgcolor
	// resets the starting state.
	frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
	frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());

	// ... even if it partially covers.
	frameBuffers[0].setOriginalFrameRect(IntRect(50, 50, 50, 50));

	frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwritePrevious);
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
	frameBuffers[0].setDisposalMethod(ImageFrame::DisposeOverwriteBgcolor);
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[1].requiredPreviousFrameIndex());
	}

	TEST(ImageDecoderTest, requiredPreviousFrameIndexBlendAtopBgcolor) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(3);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

	frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));
	frameBuffers[2].setAlphaBlendSource(ImageFrame::BlendAtopBgcolor);

	// A full frame with 'blending method == BlendAtopBgcolor' doesn't depend on
	// any prior frames.
	for (int disposeMethod = ImageFrame::DisposeNotSpecified;
	disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
	frameBuffers[1].setDisposalMethod(
	static_cast<ImageFrame::DisposalMethod>(disposeMethod));
	decoder->resetRequiredPreviousFrames();
	EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
	}

	// A non-full frame with 'blending method == BlendAtopBgcolor' does depend on
	// a prior frame.
	frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
	for (int disposeMethod = ImageFrame::DisposeNotSpecified;
	disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
	frameBuffers[1].setDisposalMethod(
	static_cast<ImageFrame::DisposalMethod>(disposeMethod));
	decoder->resetRequiredPreviousFrames();
	EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
	}
	}

	TEST(ImageDecoderTest, requiredPreviousFrameIndexKnownOpaque) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(3);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();

	frameBuffers[1].setOriginalFrameRect(IntRect(25, 25, 50, 50));

	// A full frame that is known to be opaque doesn't depend on any prior frames.
	for (int disposeMethod = ImageFrame::DisposeNotSpecified;
	disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
	frameBuffers[1].setDisposalMethod(
	static_cast<ImageFrame::DisposalMethod>(disposeMethod));
	decoder->resetRequiredPreviousFrames(true);
	EXPECT_EQ(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
	}

	// A non-full frame that is known to be opaque does depend on a prior frame.
	frameBuffers[2].setOriginalFrameRect(IntRect(50, 50, 50, 50));
	for (int disposeMethod = ImageFrame::DisposeNotSpecified;
	disposeMethod <= ImageFrame::DisposeOverwritePrevious; ++disposeMethod) {
	frameBuffers[1].setDisposalMethod(
	static_cast<ImageFrame::DisposalMethod>(disposeMethod));
	decoder->resetRequiredPreviousFrames(true);
	EXPECT_NE(kNotFound, frameBuffers[2].requiredPreviousFrameIndex());
	}
	}

	TEST(ImageDecoderTest, clearCacheExceptFrameDoNothing) {
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->clearCacheExceptFrame(0);

	// This should not crash.
	decoder->initFrames(20);
	decoder->clearCacheExceptFrame(kNotFound);
	}

	TEST(ImageDecoderTest, clearCacheExceptFrameAll) {
	const size_t numFrames = 10;
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(numFrames);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
	for (size_t i = 0; i < numFrames; ++i)
	frameBuffers[i].setStatus(i % 2 ? ImageFrame::FramePartial
	: ImageFrame::FrameComplete);

	decoder->clearCacheExceptFrame(kNotFound);

	for (size_t i = 0; i < numFrames; ++i) {
	SCOPED_TRACE(testing::Message() << i);
	EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].getStatus());
	}
	}

	TEST(ImageDecoderTest, clearCacheExceptFramePreverveClearExceptFrame) {
	const size_t numFrames = 10;
	std::unique_ptr<TestImageDecoder> decoder(wrapUnique(new TestImageDecoder()));
	decoder->initFrames(numFrames);
	Vector<ImageFrame, 1>& frameBuffers = decoder->frameBufferCache();
	for (size_t i = 0; i < numFrames; ++i)
	frameBuffers[i].setStatus(ImageFrame::FrameComplete);

	decoder->resetRequiredPreviousFrames();
	decoder->clearCacheExceptFrame(5);
	for (size_t i = 0; i < numFrames; ++i) {
	SCOPED_TRACE(testing::Message() << i);
	if (i == 5)
	EXPECT_EQ(ImageFrame::FrameComplete, frameBuffers[i].getStatus());
	else
	EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].getStatus());
	}
	}

	} // namespace blink