Start canonicalizing color for all A8 textblobs

tools/sk_tool_utils.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef sk_tool_utils_DEFINED
 #define sk_tool_utils_DEFINED
 
 #include "SkColor.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
 #include "SkPixelSerializer.h"
 #include "SkTypeface.h"
 
 class SkBitmap;
 class SkCanvas;
 class SkPaint;
 class SkShader;
 class SkTestFont;
+class SkTextBlobBuilder;
 
 namespace sk_tool_utils {
 
     const char* colortype_name(SkColorType);
 
     /**
      * Sets the paint to use a platform-independent text renderer.
      */
     void set_portable_typeface(SkPaint* paint, const char* name = NULL,
                                SkTypeface::Style style = SkTypeface::kNormal);
@@ skipping 30 matching lines @@
     class PngPixelSerializer : public SkPixelSerializer {
     public:
         bool onUseEncodedData(const void*, size_t) override { return true; }
         SkData* onEncodePixels(const SkImageInfo& info, const void* pixels,
                                size_t rowBytes) override {
             return SkImageEncoder::EncodeData(info, pixels, rowBytes,
                                               SkImageEncoder::kPNG_Type, 100);
         }
     };
 
+    // A helper for inserting a drawtext call into a SkTextBlobBuilder
+    void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
+                          SkScalar x, SkScalar y);
+
 }  // namespace sk_tool_utils
 
 #endif  // sk_tool_utils_DEFINED