/*
 * 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 "platform/graphics/ImageFrameGenerator.h"

#include "platform/CrossThreadFunctional.h"
#include "platform/SharedBuffer.h"
#include "platform/graphics/ImageDecodingStore.h"
#include "platform/graphics/test/MockImageDecoder.h"
#include "platform/image-decoders/SegmentReader.h"
#include "public/platform/Platform.h"
#include "public/platform/WebTaskRunner.h"
#include "public/platform/WebThread.h"
#include "public/platform/WebTraceLocation.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "wtf/PtrUtil.h"
#include <memory>

namespace blink {

namespace {

// Helper methods to generate standard sizes.
SkISize fullSize() {
  return SkISize::Make(100, 100);
}

SkImageInfo imageInfo() {
  return SkImageInfo::Make(100, 100, kBGRA_8888_SkColorType,
                           kOpaque_SkAlphaType);
}

}  // namespace

class ImageFrameGeneratorTest : public ::testing::Test,
                                public MockImageDecoderClient {
 public:
  void SetUp() override {
    ImageDecodingStore::instance().setCacheLimitInBytes(1024 * 1024);
    m_generator = ImageFrameGenerator::create(fullSize(), nullptr, false);
    m_data = SharedBuffer::create();
    m_segmentReader = SegmentReader::createFromSharedBuffer(m_data);
    useMockImageDecoderFactory();
    m_decodersDestroyed = 0;
    m_decodeRequestCount = 0;
    m_status = ImageFrame::FrameEmpty;
    m_frameCount = 1;
    m_requestedClearExceptFrame = kNotFound;
  }

  void TearDown() override { ImageDecodingStore::instance().clear(); }

  void decoderBeingDestroyed() override { ++m_decodersDestroyed; }

  void decodeRequested() override { ++m_decodeRequestCount; }

  ImageFrame::Status status() override {
    ImageFrame::Status currentStatus = m_status;
    m_status = m_nextFrameStatus;
    return currentStatus;
  }

  void clearCacheExceptFrameRequested(size_t clearExceptFrame) override {
    m_requestedClearExceptFrame = clearExceptFrame;
  };

  size_t frameCount() override { return m_frameCount; }
  int repetitionCount() const override {
    return m_frameCount == 1 ? cAnimationNone : cAnimationLoopOnce;
  }
  float frameDuration() const override { return 0; }

 protected:
  void useMockImageDecoderFactory() {
    m_generator->setImageDecoderFactory(
        MockImageDecoderFactory::create(this, fullSize()));
  }

  void addNewData() { m_data->append("g", 1u); }

  void setFrameStatus(ImageFrame::Status status) {
    m_status = m_nextFrameStatus = status;
  }
  void setNextFrameStatus(ImageFrame::Status status) {
    m_nextFrameStatus = status;
  }
  void setFrameCount(size_t count) {
    m_frameCount = count;
    if (count > 1) {
      m_generator.clear();
      m_generator = ImageFrameGenerator::create(fullSize(), nullptr, true);
      useMockImageDecoderFactory();
    }
  }

  RefPtr<SharedBuffer> m_data;
  RefPtr<SegmentReader> m_segmentReader;
  RefPtr<ImageFrameGenerator> m_generator;
  int m_decodersDestroyed;
  int m_decodeRequestCount;
  ImageFrame::Status m_status;
  ImageFrame::Status m_nextFrameStatus;
  size_t m_frameCount;
  size_t m_requestedClearExceptFrame;
};

TEST_F(ImageFrameGeneratorTest, incompleteDecode) {
  setFrameStatus(ImageFrame::FramePartial);

  char buffer[100 * 100 * 4];
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(1, m_decodeRequestCount);

  addNewData();
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(2, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);
}

TEST_F(ImageFrameGeneratorTest, incompleteDecodeBecomesComplete) {
  setFrameStatus(ImageFrame::FramePartial);

  char buffer[100 * 100 * 4];
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(1, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);

  setFrameStatus(ImageFrame::FrameComplete);
  addNewData();

  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(2, m_decodeRequestCount);
  EXPECT_EQ(1, m_decodersDestroyed);

  // Decoder created again.
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(3, m_decodeRequestCount);
}

static void decodeThreadMain(ImageFrameGenerator* generator,
                             SegmentReader* segmentReader) {
  char buffer[100 * 100 * 4];
  generator->decodeAndScale(segmentReader, false, 0, imageInfo(), buffer,
                            100 * 4);
}

TEST_F(ImageFrameGeneratorTest, incompleteDecodeBecomesCompleteMultiThreaded) {
  setFrameStatus(ImageFrame::FramePartial);

  char buffer[100 * 100 * 4];
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(1, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);

  // LocalFrame can now be decoded completely.
  setFrameStatus(ImageFrame::FrameComplete);
  addNewData();
  std::unique_ptr<WebThread> thread =
      wrapUnique(Platform::current()->createThread("DecodeThread"));
  thread->getWebTaskRunner()->postTask(
      BLINK_FROM_HERE,
      crossThreadBind(&decodeThreadMain, m_generator, m_segmentReader));
  thread.reset();
  EXPECT_EQ(2, m_decodeRequestCount);
  EXPECT_EQ(1, m_decodersDestroyed);

  // Decoder created again.
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(3, m_decodeRequestCount);

  addNewData();

  // Delete generator.
  m_generator = nullptr;
}

TEST_F(ImageFrameGeneratorTest, frameHasAlpha) {
  setFrameStatus(ImageFrame::FramePartial);

  char buffer[100 * 100 * 4];
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_TRUE(m_generator->hasAlpha(0));
  EXPECT_EQ(1, m_decodeRequestCount);

  ImageDecoder* tempDecoder = 0;
  EXPECT_TRUE(ImageDecodingStore::instance().lockDecoder(
      m_generator.get(), fullSize(), &tempDecoder));
  ASSERT_TRUE(tempDecoder);
  tempDecoder->frameBufferAtIndex(0)->setHasAlpha(false);
  ImageDecodingStore::instance().unlockDecoder(m_generator.get(), tempDecoder);
  EXPECT_EQ(2, m_decodeRequestCount);

  setFrameStatus(ImageFrame::FrameComplete);
  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(3, m_decodeRequestCount);
  EXPECT_FALSE(m_generator->hasAlpha(0));
}

TEST_F(ImageFrameGeneratorTest, clearMultiFrameDecoder) {
  setFrameCount(3);
  setFrameStatus(ImageFrame::FrameComplete);

  char buffer[100 * 100 * 4];
  m_generator->decodeAndScale(m_segmentReader.get(), true, 0, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(1, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);
  EXPECT_EQ(0U, m_requestedClearExceptFrame);

  setFrameStatus(ImageFrame::FrameComplete);

  m_generator->decodeAndScale(m_segmentReader.get(), true, 1, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(2, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);
  EXPECT_EQ(1U, m_requestedClearExceptFrame);

  setFrameStatus(ImageFrame::FrameComplete);

  // Decoding the last frame of a multi-frame images should trigger clearing
  // all the frame data, but not destroying the decoder.  See comments in
  // ImageFrameGenerator::tryToResumeDecode().
  m_generator->decodeAndScale(m_segmentReader.get(), true, 2, imageInfo(),
                              buffer, 100 * 4);
  EXPECT_EQ(3, m_decodeRequestCount);
  EXPECT_EQ(0, m_decodersDestroyed);
  EXPECT_EQ(kNotFound, m_requestedClearExceptFrame);
}

}  // namespace blink