Add SkCanvas::writePixels that takes info+pixels directly

bench/PremulAndUnpremulAlphaOpsBench.cpp

-
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkCanvas.h"
 #include "SkConfig8888.h"
 #include "SkString.h"
+#include "sk_tool_utils.h"
 
 class PremulAndUnpremulAlphaOpsBench : public SkBenchmark {
 public:
     PremulAndUnpremulAlphaOpsBench(SkCanvas::Config8888 config) {
         fUnPremulConfig = config;
         fName.printf("premul_and_unpremul_alpha_%s",
                      (config ==  SkCanvas::kRGBA_Unpremul_Config8888) ?
                      "RGBA8888" : "Native8888");
     }
 
@@ skipping 15 matching lines @@
         for (int h = 0; h < size.height(); ++h) {
             for (int w = 0; w < size.width(); ++w)
                 pixels[h * size.width() + w] = SkPackConfig8888(fUnPremulConfig,
                     h & 0xFF, w & 0xFF, w & 0xFF, w & 0xFF);
         }
 
         SkBitmap bmp2;
         bmp2.setConfig(SkBitmap::kARGB_8888_Config, size.width(),
                        size.height());
 
+        SkColorType ct;
+        SkAlphaType at;
+        sk_tool_utils::config8888_to_imagetypes(fUnPremulConfig, &ct, &at);
+        if (bmp1.isOpaque()) {
+            at = kOpaque_SkAlphaType;
+        }
+
         for (int loop = 0; loop < loops; ++loop) {
             // Unpremul -> Premul
-            canvas->writePixels(bmp1, 0, 0, fUnPremulConfig);
+            sk_tool_utils::write_pixels(canvas, bmp1, 0, 0, ct, at);
             // Premul -> Unpremul
             canvas->readPixels(&bmp2, 0, 0, fUnPremulConfig);
         }
     }
 
 private:
     SkCanvas::Config8888 fUnPremulConfig;
     SkString fName;
     typedef SkBenchmark INHERITED;
 };
 
 
 DEF_BENCH(return new PremulAndUnpremulAlphaOpsBench(SkCanvas::kRGBA_Unpremul_Config8888));
 DEF_BENCH(return new PremulAndUnpremulAlphaOpsBench(SkCanvas::kNative_Unpremul_Config8888));