Prototype of RAW decoding in Skia.

src/codec/SkRawAdapterCodec.cpp

Index: src/codec/SkRawAdapterCodec.cpp
diff --git a/src/codec/SkRawAdapterCodec.cpp b/src/codec/SkRawAdapterCodec.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9756651bbe13f5c4b5b747359939a1b788e11ce3
--- /dev/null
+++ b/src/codec/SkRawAdapterCodec.cpp
@@ -0,0 +1,30 @@
+/*
+ * 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 "SkCodec.h"
+#include "SkCodecPriv.h"
+#include "SkRawAdapterCodec.h"
+
+SkRawAdapterCodec::SkRawAdapterCodec(SkRawCodec* codec)
+    : INHERITED(codec)
+{}
+
+SkISize SkRawAdapterCodec::onGetSampledDimensions(int sampleSize) const {

[scroggo, 2016/01/08 17:12:25]

This file is starting to look almost exactly like SkWebpAdapatorCodec.cpp.

Two differences:
- This one does not support subsets, but the code in that file will support
that: if a subset is requested, getSampledSubsetDimensions() will be called and
return (0,0), which result in a failure.
- This one does not check to make sure the dimensions are supported when there's
no subset either. I'm not sure whether it needs to or not.

[yujieqin, 2016/01/11 14:03:07]

These two do look similar to some extend, but, as you mentioned, there are still
differences regarding how to handle the subset. Right now, we think we can keep
it separated.

+    float scale = 1.f / static_cast<float>(sampleSize);
+    return this->codec()->getScaledDimensions(scale);
+}
+
+SkCodec::Result SkRawAdapterCodec::onGetAndroidPixels(
+        const SkImageInfo& info, void* pixels, size_t rowBytes,
+        const AndroidOptions& options) {
+    SkCodec::Options codecOptions;
+    codecOptions.fZeroInitialized = options.fZeroInitialized;
+    codecOptions.fSubset = options.fSubset;
+    return this->codec()->getPixels(
+        info, pixels, rowBytes, &codecOptions, options.fColorPtr,
+        options.fColorCount);
+}