Add an option to create unpremultiplied bitmaps.

include/core/SkColor.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkColor_DEFINED
@@ skipping 127 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////
 
 /** 32 bit ARGB color value, premultiplied. The byte order for this value is
     configuration dependent, matching the format of kARGB32 bitmaps. This is different
     from SkColor, which is nonpremultiplied, and is always in the same byte order.
 */
 typedef uint32_t SkPMColor;
 
+/** Like SkPMColor, this is a 32 bit ARGB configuration dependent ordered color, but it is

[reed1, 2013/06/12 20:20:00]

On conservative side, lets not make this public (yet)

+    nonpremultiplied, like SkColor.
+*/
+typedef SkPMColor SkUnPMColor;
+
+// Convert an unmultiplied color to a premultiplied color.
+SkPMColor SkPreMultiplyUnPMColor(SkUnPMColor c);
+
 /** Return a SkPMColor value from unpremultiplied 8 bit component values
 */
 SK_API SkPMColor SkPreMultiplyARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b);
 /** Return a SkPMColor value from a SkColor value. This is done by multiplying the color
     components by the color's alpha, and by arranging the bytes in a configuration
     dependent order, to match the format of kARGB32 bitmaps.
 */
 SK_API SkPMColor SkPreMultiplyColor(SkColor c);
 
 /** Define a function pointer type for combining two premultiplied colors
 */
 typedef SkPMColor (*SkXfermodeProc)(SkPMColor src, SkPMColor dst);
 
 /** Define a function pointer type for combining a premultiplied src color
     and a 16bit device color.
 */
 typedef uint16_t (*SkXfermodeProc16)(SkPMColor src, uint16_t dst);
 
 #endif