Index8 GPU and CPU raster support.

include/core/SkImageGenerator.h

Index: include/core/SkImageGenerator.h
diff --git a/include/core/SkImageGenerator.h b/include/core/SkImageGenerator.h
index 3d508ddfb1c7ec7f1ceb34b9a12d3ce3d50f6060..c9ae1376bcb96a36d41e922b339f997766041cf8 100644
--- a/include/core/SkImageGenerator.h
+++ b/include/core/SkImageGenerator.h
@@ -74,7 +74,12 @@ public:
     /**
      *  Return the ImageInfo associated with this generator.
      */
-    const SkImageInfo& getInfo() const { return fInfo; }
+    const SkImageInfo& getInfo() {
+        SkColorType colorType;
+        if ((colorType = onGetColorType()) != fInfo.colorType())
+            fInfo = fInfo.makeColorType(colorType);
+        return fInfo;
+    }
 
     /**
      *  Decode into the given pixels, a block of memory of size at
@@ -199,10 +204,12 @@ protected:
         return nullptr;
     }
 
+    virtual SkColorType onGetColorType() { return fInfo.colorType(); }

[aleksandar.stojiljkovic, 2015/12/07 19:31:02]

Does this look better?
Implemented the chromium part here [1], works OK.

[1]
https://codereview.chromium.org/1460523002/diff/100001/third_party/WebKit/Sou...

+
     bool tryGenerateBitmap(SkBitmap* bm, const SkImageInfo* optionalInfo, SkBitmap::Allocator*);
 
 private:
-    const SkImageInfo fInfo;
+    SkImageInfo fInfo;
     const uint32_t fUniqueID;
 
     // This is our default impl, which may be different on different platforms.