Add RAW decoding into Skia.

TBR=reed@google.com

BUG=skia:

(Based on the work from ebrauer in https://codereview.chromium.org/1459473007)
(Based on the work from adaubert in https://codereview.chromium.org/1494003003)
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1520403003

Committed: https://skia.googlesource.com/skia/+/6bd8639f8c142eedf543f4e5f3b02d2bf11df308

Review URL: https://codereview.chromium.org/1520403003

1 files changed, 60 insertions, 0 deletions

diff --git a/src/codec/SkRawCodec.h b/src/codec/SkRawCodec.h
new file mode 100644
index 0000000000..42755c3ef1
--- /dev/null
+++ b/src/codec/SkRawCodec.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRawCodec_DEFINED
+#define SkRawCodec_DEFINED
+
+#include "SkCodec.h"
+#include "SkImageInfo.h"
+#include "SkTypes.h"
+
+class SkDngImage;
+class SkStream;
+
+/*
+ *
+ * This class implements the decoding for RAW images
+ *
+ */
+class SkRawCodec : public SkCodec {
+public:
+
+    /*
+     * Creates a RAW decoder
+     * Takes ownership of the stream
+     */
+    static SkCodec* NewFromStream(SkStream*);
+
+    ~SkRawCodec() override;
+
+protected:
+
+    Result onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options&,
+            SkPMColor*, int*, int*) override;
+
+    SkEncodedFormat onGetEncodedFormat() const override {
+        return kRAW_SkEncodedFormat;
+    }
+
+    SkISize onGetScaledDimensions(float desiredScale) const override;
+
+    bool onDimensionsSupported(const SkISize&) override;
+
+private:
+
+    /*
+     * Creates an instance of the decoder
+     * Called only by NewFromStream, takes ownership of dngImage.
+     */
+    SkRawCodec(SkDngImage* dngImage);
+
+    SkAutoTDelete<SkDngImage> fDngImage;
+
+    typedef SkCodec INHERITED;
+};
+
+#endif