gm/fontcache.cpp

   1 /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm.h"
   9 #include "sk_tool_utils.h"
  10 #include "SkCanvas.h"
  11 #include "SkGraphics.h"
  12 #include "SkTypeface.h"
  13
  14 // GM to stress the GPU font cache
  15
  16 static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
  17                            SkScalar y, const SkPaint& paint) {
  18     canvas->drawString(text, x, y, paint);
  19     return x + paint.measureText(text.c_str(), text.size());
  20 }
  21
  22 class FontCacheGM : public skiagm::GM {
  23 public:
  24     FontCacheGM() {}
  25
  26 protected:
  27     SkString onShortName() override {
  28         return SkString("fontcache");
  29     }
  30
  31     SkISize onISize() override {
  32         return SkISize::Make(1280, 640);
  33     }
  34
  35     void onOnceBeforeDraw() override {
  36         fTypefaces[0] = sk_tool_utils::create_portable_typeface("serif",
  37             SkFontStyle::FromOldStyle(SkTypeface::kItalic));
  38         fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif",
  39             SkFontStyle::FromOldStyle(SkTypeface::kItalic));
  40     }
  41
  42     void onDraw(SkCanvas* canvas) override {
  43         SkPaint paint;
  44         paint.setAntiAlias(true);
  45         paint.setLCDRenderText(true);
  46         paint.setSubpixelText(true);
  47         paint.setTypeface(fTypefaces[0]);
  48         paint.setTextSize(192);
  49
  50         // Make sure the nul character does not cause problems.
  51         paint.measureText("\0", 1);
  52
  53         SkScalar x = 20;
  54         SkScalar y = 128;
  55         SkString text("ABCDEFGHIJ");
  56         draw_string(canvas, text, x, y, paint);
  57         y += 100;
  58         SkString text2("KLMNOPQRS");
  59         draw_string(canvas, text2, x, y, paint);
  60         y += 100;
  61         SkString text3("TUVWXYZ012");
  62         draw_string(canvas, text3, x, y, paint);
  63         y += 100;
  64         paint.setTypeface(fTypefaces[1]);
  65         draw_string(canvas, text, x, y, paint);
  66         y += 100;
  67         draw_string(canvas, text2, x, y, paint);
  68         y += 100;
  69         draw_string(canvas, text3, x, y, paint);
  70         y += 100;
  71     }
  72
  73 private:
  74     sk_sp<SkTypeface> fTypefaces[2];
  75     typedef GM INHERITED;
  76 };
  77
  78
  79 //////////////////////////////////////////////////////////////////////////////
  80
  81 DEF_GM(return new FontCacheGM;)