diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/core/SkImageGenerator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/core/SkImageGenerator.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkImageGenerator_DEFINED
+#define SkImageGenerator_DEFINED
+
+#include "SkDiscardableMemory.h"
+#include "SkImageInfo.h"
+
+class SkBitmap;
+class SkData;
+class SkImageGenerator;
+
+/**
+ *  Takes ownership of SkImageGenerator.  If this method fails for
+ *  whatever reason, it will return false and immediatetely delete
+ *  the generator.  If it succeeds, it will modify destination
+ *  bitmap.
+ *
+ *  If generator is NULL, will safely return false.
+ *
+ *  If this fails or when the SkDiscardablePixelRef that is
+ *  installed into destination is destroyed, it will call
+ *  SkDELETE() on the generator.  Therefore, generator should be
+ *  allocated with SkNEW() or SkNEW_ARGS().
+ *
+ *  @param destination Upon success, this bitmap will be
+ *  configured and have a pixelref installed.
+ *
+ *  @param factory If not NULL, this object will be used as a
+ *  source of discardable memory when decoding.  If NULL, then
+ *  SkDiscardableMemory::Create() will be called.
+ *
+ *  @return true iff successful.
+ */
+SK_API bool SkInstallDiscardablePixelRef(SkImageGenerator* generator,
+                                         SkBitmap* destination,
+                                         SkDiscardableMemory::Factory* factory = NULL);
+
+
+/**
+ *  An interface that allows a purgeable PixelRef (such as a
+ *  SkDiscardablePixelRef) to decode and re-decode an image as needed.
+ */
+class SK_API SkImageGenerator {
+public:
+    /**
+     *  The PixelRef which takes ownership of this SkImageGenerator
+     *  will call the image generator's destructor.
+     */
+    virtual ~SkImageGenerator() { }
+
+    /**
+     *  Return a ref to the encoded (i.e. compressed) representation,
+     *  of this data.
+     *
+     *  If non-NULL is returned, the caller is responsible for calling
+     *  unref() on the data when it is finished.
+     */
+    virtual SkData* refEncodedData() { return NULL; }
+
+    /**
+     *  Return some information about the image, allowing the owner of
+     *  this object to allocate pixels.
+     *
+     *  Repeated calls to this function should give the same results,
+     *  allowing the PixelRef to be immutable.
+     *
+     *  @return false if anything goes wrong.
+     */
+    virtual bool getInfo(SkImageInfo* info) = 0;
+
+    /**
+     *  Decode into the given pixels, a block of memory of size at
+     *  least (info.fHeight - 1) * rowBytes + (info.fWidth *
+     *  bytesPerPixel)
+     *
+     *  Repeated calls to this function should give the same results,
+     *  allowing the PixelRef to be immutable.
+     *
+     *  @param info A description of the format (config, size)
+     *         expected by the caller.  This can simply be identical
+     *         to the info returned by getInfo().
+     *
+     *         This contract also allows the caller to specify
+     *         different output-configs, which the implementation can
+     *         decide to support or not.
+     *
+     *  @return false if anything goes wrong or if the image info is
+     *          unsupported.
+     */
+    virtual bool getPixels(const SkImageInfo& info,
+                           void* pixels,
+                           size_t rowBytes) = 0;
+};
+
+#endif  // SkImageGenerator_DEFINED