Add sampler options to SkScaledBitmapSampler

src/images/SkScaledBitmapSampler.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkScaledBitmapSampler_DEFINED
 #define SkScaledBitmapSampler_DEFINED
 
@@ skipping 16 matching lines @@
 
     enum SrcConfig {
         kGray,  // 1 byte per pixel
         kIndex, // 1 byte per pixel
         kRGB,   // 3 bytes per pixel
         kRGBX,  // 4 byes per pixel (ignore 4th)
         kRGBA,  // 4 bytes per pixel
         kRGB_565 // 2 bytes per pixel
     };
 
+    struct Options {
+        bool fDither;
+        bool fPremultiplyAlpha;
+        bool fSkipZeros;
+        explicit Options(const SkImageDecoder &dec)
+            : fDither(dec.getDitherImage())
+            , fPremultiplyAlpha(!dec.getRequireUnpremultipliedColors())
+            , fSkipZeros(dec.getSkipWritingZeroes())
+            { }
+    };
+
     // Given a dst bitmap (with pixels already allocated) and a src-config,
     // prepares iterator to process the src colors and write them into dst.
     // Returns false if the request cannot be fulfulled.
     bool begin(SkBitmap* dst, SrcConfig sc, const SkImageDecoder& decoder,
                const SkPMColor* = NULL);
+    bool begin(SkBitmap* dst, SrcConfig sc, const Options& opts,
+               const SkPMColor* = NULL);
     // call with row of src pixels, for y = 0...scaledHeight-1.
     // returns true if the row had non-opaque alpha in it
     bool next(const uint8_t* SK_RESTRICT src);
 
     // Like next(), but specifies the y value of the source row, so the
     // rows can come in any order. If the row is not part of the output
     // sample, it will be skipped. Only sampleInterlaced OR next should
     // be called for one SkScaledBitmapSampler.
     bool sampleInterlaced(const uint8_t* SK_RESTRICT src, int srcY);
 
@@ skipping 33 matching lines @@
     // optional reference to the src colors if the src is a palette model
     const SkPMColor* fCTable;
 
 #ifdef SK_DEBUG
     // Helper class allowing a test to have access to fRowProc.
     friend class RowProcTester;
 #endif
 };
 
 #endif