Provides multiple implementations of Android's SkBitmapRegionDecoder

dm/DMSrcSink.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMSrcSink_DEFINED
 #define DMSrcSink_DEFINED
 
 #include "DMGpuSupport.h"
 #include "SkBBHFactory.h"
 #include "SkBBoxHierarchy.h"
 #include "SkBitmap.h"
+#include "SkBitmapRegionDecoder.h"
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkGPipe.h"
 #include "SkPicture.h"
 #include "gm.h"
 
 namespace DM {
 
 // This is just convenience.  It lets you use either return "foo" or return SkStringPrintf(...).
 struct ImplicitString : public SkString {
@@ skipping 82 matching lines @@
         kCodec_Mode,
         kScanline_Mode,
         kScanline_Subset_Mode,
         kStripe_Mode, // Tests the skipping of scanlines
         kSubset_Mode, // For codecs that support subsets directly.
     };
     enum DstColorType {
         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);
 
     Error draw(SkCanvas*) const override;
     SkISize size() const override;
     Name name() const override;
     bool veto(SinkFlags) const override;
 private:
     Path                    fPath;
     Mode                    fMode;
     DstColorType            fDstColorType;
     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:
     // divisor == 0 means decode the whole image
     // divisor > 0 means decode in subsets, dividing into a divisor x divisor grid.
     explicit ImageSrc(Path path, int divisor = 0);
 
     Error draw(SkCanvas*) const override;
     SkISize size() const override;
     Name name() const override;
@@ skipping 169 matching lines @@
 
 class ViaTwice : public Via {
 public:
     explicit ViaTwice(Sink* sink) : Via(sink) {}
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED