src/third_party/skia/gm/lcdtext.cpp

   1
   2 /*
   3  * Copyright 2011 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8
   9
  10 /* Tests text rendering with LCD and subpixel rendering turned on and off.
  11  */
  12
  13 #include "gm.h"
  14 #include "SkCanvas.h"
  15
  16 namespace skiagm {
  17
  18 class LcdTextGM : public GM {
  19 public:
  20     LcdTextGM() {
  21         const int pointSize = 36;
  22         textHeight = SkIntToScalar(pointSize);
  23     }
  24
  25 protected:
  26
  27     SkString onShortName() {
  28         return SkString("lcdtext");
  29     }
  30
  31     SkISize onISize() { return SkISize::Make(640, 480); }
  32
  33     virtual void onDraw(SkCanvas* canvas) {
  34
  35         y = textHeight;
  36         drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderTrue"),
  37                  true,  true);
  38         drawText(canvas, SkString("TEXT: SubpixelTrue LCDRenderFalse"),
  39                  true,  false);
  40         drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderTrue"),
  41                  false, true);
  42         drawText(canvas, SkString("TEXT: SubpixelFalse LCDRenderFalse"),
  43                  false, false);
  44     }
  45
  46     void drawText(SkCanvas* canvas, const SkString& string,
  47                   bool subpixelTextEnabled, bool lcdRenderTextEnabled) {
  48         SkPaint paint;
  49         paint.setColor(SK_ColorBLACK);
  50         paint.setDither(true);
  51         paint.setAntiAlias(true);
  52         sk_tool_utils::set_portable_typeface(&paint);
  53         paint.setSubpixelText(subpixelTextEnabled);
  54         paint.setLCDRenderText(lcdRenderTextEnabled);
  55         paint.setTextSize(textHeight);
  56
  57         canvas->drawText(string.c_str(), string.size(), 0, y, paint);
  58         y += textHeight;
  59     }
  60
  61 private:
  62     typedef GM INHERITED;
  63     SkScalar y, textHeight;
  64 };
  65
  66 ///////////////////////////////////////////////////////////////////////////////
  67
  68 static GM* MyFactory(void*) { return new LcdTextGM; }
  69 static GMRegistry reg(MyFactory);
  70
  71 }