Eliminate copies of encoded image data

third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp

 /*
  * 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
@@ skipping 11 matching lines @@
  * (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/SharedBuffer.h"
 #include "platform/ThreadSafeFunctional.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"
 
 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(), false);
         m_data = SharedBuffer::create();
-        m_generator = ImageFrameGenerator::create(fullSize(), m_data, false);
+        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
     {
@@ skipping 25 matching lines @@
     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(bool allDataReceived = false)
+    void addNewData()
     {
         m_data->append("g", 1u);
-        m_generator->setData(m_data, allDataReceived);
     }
 
     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(), m_data, true, true);
+            m_generator = ImageFrameGenerator::create(fullSize(), 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(0, imageInfo(), buffer, 100 * 4);
+    m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(), buffer, 100 * 4);
     EXPECT_EQ(1, m_decodeRequestCount);
 
     addNewData();
-    m_generator->decodeAndScale(0, imageInfo(), buffer, 100 * 4);
+    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(0, imageInfo(), buffer, 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(0, imageInfo(), buffer, 100 * 4);
+    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(0, imageInfo(), buffer, 100 * 4);
+    m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(), buffer, 100 * 4);
     EXPECT_EQ(3, m_decodeRequestCount);
 }
 
-static void decodeThreadMain(ImageFrameGenerator* generator)
+static void decodeThreadMain(ImageFrameGenerator* generator, SegmentReader* segmentReader)
 {
     char buffer[100 * 100 * 4];
-    generator->decodeAndScale(0, imageInfo(), buffer, 100 * 4);
-}
-
-static void decodeThreadWithRefEncodedMain(ImageFrameGenerator* generator)
-{
-    // Image must be complete - refEncodedData otherwise returns null.
-    char buffer[100 * 100 * 4];
-    SkData* data = generator->refEncodedData();
-    generator->decodeAndScale(0, imageInfo(), buffer, 100 * 4);
-    data->unref();
+    generator->decodeAndScale(segmentReader, false, 0, imageInfo(), buffer, 100 * 4);
 }
 
 TEST_F(ImageFrameGeneratorTest, incompleteDecodeBecomesCompleteMultiThreaded)
 {
     setFrameStatus(ImageFrame::FramePartial);
 
     char buffer[100 * 100 * 4];
-    m_generator->decodeAndScale(0, imageInfo(), buffer, 100 * 4);
+    m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(), buffer, 100 * 4);
     EXPECT_EQ(1, m_decodeRequestCount);
     EXPECT_EQ(0, m_decodersDestroyed);
-    SkData* data = m_generator->refEncodedData();
-    EXPECT_EQ(nullptr, data);
 
     // LocalFrame can now be decoded completely.
     setFrameStatus(ImageFrame::FrameComplete);
     addNewData();
-    // addNewData is calling m_generator->setData with allDataReceived == false, which means that
-    // refEncodedData should return null.
-    data = m_generator->refEncodedData();
-    EXPECT_EQ(nullptr, data);
     OwnPtr<WebThread> thread = adoptPtr(Platform::current()->createThread("DecodeThread"));
-    thread->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&decodeThreadMain, AllowCrossThreadAccess(m_generator.get())));
+    thread->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&decodeThreadMain, AllowCrossThreadAccess(m_generator.get()), AllowCrossThreadAccess(m_segmentReader.get())));
     thread.clear();
     EXPECT_EQ(2, m_decodeRequestCount);
     EXPECT_EQ(1, m_decodersDestroyed);
 
     // Decoder created again.
-    m_generator->decodeAndScale(0, imageInfo(), buffer, 100 * 4);
+    m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(), buffer, 100 * 4);
     EXPECT_EQ(3, m_decodeRequestCount);
 
-    addNewData(true);
-    data = m_generator->refEncodedData();
-    ASSERT_TRUE(data);
-    // To prevent data writting, SkData::unique() should be false.
-    ASSERT_TRUE(!data->unique());
+    addNewData();
 
-    // Thread will also ref and unref the data.
-    thread = adoptPtr(Platform::current()->createThread("RefEncodedDataThread"));
-    thread->getWebTaskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&decodeThreadWithRefEncodedMain, AllowCrossThreadAccess(m_generator.get())));
-    thread.clear();
-    EXPECT_EQ(4, m_decodeRequestCount);
-
-    data->unref();
-    // m_generator is holding the only reference to SkData now.
-    ASSERT_TRUE(data->unique());
-
-    data = m_generator->refEncodedData();
-    ASSERT_TRUE(data && !data->unique());
-
-    // Delete generator, and SkData should have the only reference.
+    // Delete generator.
     m_generator = nullptr;
-    ASSERT_TRUE(data->unique());
-    data->unref();
 }
 
 TEST_F(ImageFrameGeneratorTest, frameHasAlpha)
 {
     setFrameStatus(ImageFrame::FramePartial);
 
     char buffer[100 * 100 * 4];
-    m_generator->decodeAndScale(0, imageInfo(), buffer, 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(0, imageInfo(), buffer, 100 * 4);
+    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(0, imageInfo(), buffer, 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(1, imageInfo(), buffer, 100 * 4);
+    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(2, imageInfo(), buffer, 100 * 4);
+    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