Add an option to create unpremultiplied bitmaps.

samplecode/SampleColorFilter.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 66 matching lines @@
         e0 += err0;
         e1 += err1;
         e2 += err2;
         ae0 += SkAbs32(err0);
         ae1 += SkAbs32(err1);
         ae2 += SkAbs32(err2);
     }
     SkDebugf("--- trunc: %d %d  round: %d %d new: %d %d\n", e0, ae0, e1, ae1, e2, ae2);
 }
 
-static SkShader* createChecker() {
+// No longer marked static, since it is externed in SampleUnpremul.
+SkShader* createChecker() {
     SkBitmap bm;
     bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
     bm.allocPixels();
     bm.lockPixels();
     *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = SkPreMultiplyColor(0xFFFFFFFF);
     *bm.getAddr32(0, 1) = *bm.getAddr32(1, 0) = SkPreMultiplyColor(0xFFCCCCCC);
     SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
                                                SkShader::kRepeat_TileMode);
 
     SkMatrix m;
@@ skipping 114 matching lines @@
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ColorFilterView; }
 static SkViewRegister reg(MyFactory);