Early reporting of opaqueness by decoders.

third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp

Index: third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp b/third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp
index 305989a7f5d85b376926dd9604a2b114999a7c65..1bb8a3710642f23123a75e537f9eac277c20c9fa 100644
--- a/third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/jpeg/JPEGImageDecoderTest.cpp
@@ -281,4 +281,22 @@ TEST(JPEGImageDecoderTest, mergeBuffer)
     testMergeBuffer(&createDecoder, jpegFile);
 }
 
+TEST(JPEGImageDecoderTest, hasAlphaAtIndex)
+{
+    const char* jpegFile = "/LayoutTests/fast/images/resources/lenna.jpg";
+    RefPtr<SharedBuffer> data = readFile(jpegFile);
+    ASSERT_TRUE(data);
+
+    OwnPtr<ImageDecoder> decoder = createDecoder();
+    EXPECT_TRUE(decoder->frameHasAlphaAtIndex(0));
+
+    decoder->setData(data.get(), false);
+    EXPECT_TRUE(decoder->frameHasAlphaAtIndex(0));
+    EXPECT_TRUE(decoder->frameHasAlphaAtIndex(1));
+
+    decoder->setData(data.get(), true);
+    EXPECT_FALSE(decoder->frameHasAlphaAtIndex(0));
+    EXPECT_TRUE(decoder->frameHasAlphaAtIndex(1));
+}
+
 } // namespace blink