Eliminate copies of encoded image data

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

Index: third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp b/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
index 9edaf3875ec4dc49a7947909763d15d5cf0d0bfb..d36ffdaaf88f166e6d2522d258493c0f2f9cf183 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
@@ -30,6 +30,7 @@
 #include "platform/ThreadSafeFunctional.h"
 #include "platform/graphics/ImageDecodingStore.h"
 #include "platform/graphics/test/MockImageDecoder.h"
+#include "platform/image-decoders/SharedBufferSegmentReader.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
@@ -54,8 +55,9 @@ 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 = adoptRef(new SharedBufferSegmentReader(m_data));
         useMockImageDecoderFactory();
         m_decodersDestroyed = 0;
         m_decodeRequestCount = 0;
@@ -95,10 +97,9 @@ protected:
         m_generator->setImageDecoderFactory(MockImageDecoderFactory::create(this, fullSize()));
     }
 
-    void addNewData(bool allDataReceived = false)
+    void addNewData()
     {
         m_data->append("g", 1);
-        m_generator->setData(m_data, allDataReceived);
     }
 
     void setFrameStatus(ImageFrame::Status status)  { m_status = m_nextFrameStatus = status; }
@@ -108,12 +109,13 @@ protected:
         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;
@@ -127,11 +129,11 @@ 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);
 }
@@ -141,35 +143,26 @@ 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)
@@ -177,52 +170,27 @@ 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->taskRunner()->postTask(BLINK_FROM_HERE, new Task(threadSafeBind(&decodeThreadMain, AllowCrossThreadAccess(m_generator.get()))));
+    thread->taskRunner()->postTask(BLINK_FROM_HERE, new Task(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());
-
-    // Thread will also ref and unref the data.
-    thread = adoptPtr(Platform::current()->createThread("RefEncodedDataThread"));
-    thread->taskRunner()->postTask(BLINK_FROM_HERE, new Task(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());
+    addNewData();
 
-    // Delete generator, and SkData should have the only reference.
+    // Delete generator.
     m_generator = nullptr;
-    ASSERT_TRUE(data->unique());
-    data->unref();
 }
 
 TEST_F(ImageFrameGeneratorTest, frameHasAlpha)
@@ -230,7 +198,7 @@ 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);
 
@@ -242,7 +210,7 @@ TEST_F(ImageFrameGeneratorTest, frameHasAlpha)
     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));
 }
@@ -253,20 +221,20 @@ TEST_F(ImageFrameGeneratorTest, removeMultiFrameDecoder)
     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);
 
     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);
 
     setFrameStatus(ImageFrame::FrameComplete);
 
     // Multi frame decoder should be removed.
-    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(1, m_decodersDestroyed);
 }