Create an SkCodecImageGenerator

src/core/SkCodecImageGenerator.cpp

Index: src/core/SkCodecImageGenerator.cpp
diff --git a/src/core/SkCodecImageGenerator.cpp b/src/core/SkCodecImageGenerator.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4fe4f8675b0cc5660afabc53f05f158fc1a23e6d
--- /dev/null
+++ b/src/core/SkCodecImageGenerator.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkCodecImageGenerator.h"
+
+SkImageGenerator* SkCodecImageGenerator::NewFromEncodedCodec(SkData* data) {
+    SkCodec* codec = SkCodec::NewFromData(data);
+    if (nullptr == codec) {
+        return nullptr;
+    }
+
+    return new SkCodecImageGenerator(codec, data);
+}
+
+SkCodecImageGenerator::SkCodecImageGenerator(SkCodec* codec, SkData* data)
+    : INHERITED(codec->getInfo())
+    , fCodec(codec)
+    , fData(SkRef(data))
+{}
+
+SkData* SkCodecImageGenerator::onRefEncodedData() {
+    return SkRef(fData.get());
+}
+
+bool SkCodecImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
+        SkPMColor ctable[], int* ctableCount) {
+
+    SkCodec::Result result = fCodec->getPixels(info, pixels, rowBytes, nullptr, ctable,
+            ctableCount);
+    switch (result) {
+        case SkCodec::kSuccess:
+        case SkCodec::kIncompleteInput:
+            return true;
+        default:
+            return false;
+    }
+}
+
+bool SkCodecImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
+        SkYUVColorSpace* colorSpace) {
+    return false;
+}