Provides multiple implementations of Android's SkBitmapRegionDecoder

dm/DMSrcSink.h

Index: dm/DMSrcSink.h
diff --git a/dm/DMSrcSink.h b/dm/DMSrcSink.h
index efae87138e50c6684b0ef1e65bfbbb7272aedaab..df00dc8874e3afb37a7dfd53ae6aa98b3985bde3 100644
--- a/dm/DMSrcSink.h
+++ b/dm/DMSrcSink.h
@@ -12,6 +12,7 @@
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 #include "SkBitmap.h"
+#include "SkBitmapRegionDecoder.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkGPipe.h"
@@ -114,6 +115,7 @@ public:
         kGetFromCanvas_DstColorType,
         kIndex8_Always_DstColorType,
         kGrayscale_Always_DstColorType,
+        kAlpha_Always_DstColorType,

[scroggo, 2015/09/03 20:07:41]

Alpha8 is used as a hack for Grayscale. Maybe we should reuse Grayscale, and
make the BRD translate?

[msarett, 2015/09/03 22:10:30]

Yes I think this makes sense.

     };
     CodecSrc(Path, Mode, DstColorType, float);
 
@@ -128,6 +130,34 @@ private:
     float                   fScale;
 };
 
+// Allows for testing of various implementations of Android's BitmapRegionDecoder
+class BRDSrc : public Src {
+public:
+    enum Mode {
+        // Decode the entire image as one region.
+        kFullImage_Mode,
+        // Splits the image into multiple regions using a divisor and decodes the regions
+        // separately.  Also, this test adds a border of a few pixels to each of the regions
+        // that it is decoding.  This tests the behavior when a client asks for a region that
+        // does not fully fit in the image.
+        kDivisor_Mode,
+    };
+
+    BRDSrc(Path, SkBitmapRegionDecoder::Strategy, Mode, CodecSrc::DstColorType, uint32_t);
+
+    static float GetScale(uint32_t sampleSize) { return 1.0f / (float) sampleSize; }
+
+    Error draw(SkCanvas*) const override;
+    SkISize size() const override;
+    Name name() const override;
+    bool veto(SinkFlags) const override;
+private:
+    Path                            fPath;
+    SkBitmapRegionDecoder::Strategy fStrategy;
+    Mode                            fMode;
+    CodecSrc::DstColorType          fDstColorType;
+    uint32_t                        fSampleSize;
+};
 
 class ImageSrc : public Src {
 public: