Create an SkCodecImageGenerator

BUG=skia:

patch from issue 1396323007 at patchset 120001 (http://crrev.com/1396323007#ps120001)
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1487683004

Committed: https://skia.googlesource.com/skia/+/e1102ce1d3d0895e840e756e155ec56b5a1a7540

Review URL: https://codereview.chromium.org/1487683004

1 files changed, 46 insertions, 0 deletions

diff --git a/src/codec/SkCodecImageGenerator.cpp b/src/codec/SkCodecImageGenerator.cpp
new file mode 100644
index 0000000000..2fef381ec1
--- /dev/null
+++ b/src/codec/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(SK_REFENCODEDDATA_CTXPARAM) {
+    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;
+}