Remove full-size bitmap copy on SkImage::scalePixels->IFG::decodeAndScale

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 c72740578780138748b5e4a7f3ff8f3616f71faf..53f231fd5abecc469f587dc57057720abe08b64f 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageFrameGeneratorTest.cpp
@@ -140,6 +140,7 @@ TEST_F(ImageFrameGeneratorTest, incompleteDecode) {
   m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
                               buffer, 100 * 4);
   EXPECT_EQ(2, m_decodeRequestCount);
+
   EXPECT_EQ(0, m_decodersDestroyed);
 }
 
@@ -166,6 +167,37 @@ TEST_F(ImageFrameGeneratorTest, incompleteDecodeBecomesComplete) {
   EXPECT_EQ(3, m_decodeRequestCount);
 }
 
+TEST_F(ImageFrameGeneratorTest, scaleAfterDecode) {
+  setFrameStatus(ImageFrame::FramePartial);
+
+  char scaledBuffer[30 * 30 * 4];
+  m_generator->decodeAndScale(m_segmentReader.get(), false, 0,
+                              imageInfo().makeWH(30, 30), scaledBuffer, 30 * 4);
+  EXPECT_EQ(1, m_decodeRequestCount);
+
+  char buffer[100 * 100 * 4];
+  addNewData();
+  m_generator->decodeAndScale(m_segmentReader.get(), false, 0, imageInfo(),
+                              buffer, 100 * 4);
+  EXPECT_EQ(2, m_decodeRequestCount);
+
+  char scaledBuffer1[45 * 48 * 4];
+  addNewData();
+  m_generator->decodeAndScale(m_segmentReader.get(), false, 0,
+                              imageInfo().makeWH(45, 45), scaledBuffer1,
+                              48 * 4);
+  EXPECT_EQ(3, m_decodeRequestCount);
+  EXPECT_EQ(0, m_decodersDestroyed);
+
+  setFrameStatus(ImageFrame::FrameComplete);
+  addNewData();
+
+  m_generator->decodeAndScale(m_segmentReader.get(), false, 0,
+                              imageInfo().makeWH(30, 30), scaledBuffer, 30 * 4);
+  EXPECT_EQ(4, m_decodeRequestCount);
+  EXPECT_EQ(1, m_decodersDestroyed);
+}
+
 static void decodeThreadMain(ImageFrameGenerator* generator,
                              SegmentReader* segmentReader) {
   char buffer[100 * 100 * 4];