Add an option to create unpremultiplied bitmaps.

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 18 matching lines @@
         kRGB,   // 3 bytes per pixel
         kRGBX,  // 4 byes per pixel (ignore 4th)
         kRGBA,  // 4 bytes per pixel
         kRGB_565 // 2 bytes per pixel
     };
 
     // 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, bool doDither,
-               const SkPMColor* = NULL);
+               const SkPMColor* = NULL, bool requireUnPremul = false);
     // 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);
 
 private:
     int fScaledWidth;
     int fScaledHeight;
 
     int fX0;    // first X coord to sample
     int fY0;    // first Y coord (scanline) to sample
@@ skipping 10 matching lines @@
     size_t  fDstRowBytes;
     int     fCurrY; // used for dithering
     int     fSrcPixelSize;  // 1, 3, 4
     RowProc fRowProc;
 
     // optional reference to the src colors if the src is a palette model
     const SkPMColor* fCTable;
 };
 
 #endif