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 "SkCanvas.h"
  10 #include "SkGraphics.h"
  11 #include "SkTypeface.h"
  12
  13 // GM to stress the GPU font cache
  14
  15 static SkScalar draw_string(SkCanvas* canvas, const SkString& text, SkScalar x,
  16                            SkScalar y, const SkPaint& paint) {
  17     canvas->drawText(text.c_str(), text.size(), x, y, paint);
  18     return x + paint.measureText(text.c_str(), text.size());
  19 }
  20
  21 class FontCacheGM : public skiagm::GM {
  22 public:
  23     FontCacheGM() {
  24         fTypefaces[0] = NULL;
  25         fTypefaces[1] = NULL;
  26     }
  27
  28     virtual ~FontCacheGM() {
  29         SkSafeUnref(fTypefaces[0]);
  30         SkSafeUnref(fTypefaces[1]);
  31     }
  32
  33 protected:
  34     SkString onShortName() override {
  35         return SkString("fontcache");
  36     }
  37
  38     SkISize onISize() override {
  39         return SkISize::Make(1280, 640);
  40     }
  41
  42     void onOnceBeforeDraw() override {
  43         fTypefaces[0] = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kItalic);
  44         fTypefaces[1] = sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kItalic);
  45     }
  46
  47     void onDraw(SkCanvas* canvas) override {
  48         SkPaint paint;
  49         paint.setAntiAlias(true);
  50         paint.setLCDRenderText(true);
  51         paint.setSubpixelText(true);
  52         paint.setTypeface(fTypefaces[0]);
  53         paint.setTextSize(192);
  54
  55         // Make sure the nul character does not cause problems.
  56         paint.measureText("\0", 1);
  57
  58         SkScalar x = 20;
  59         SkScalar y = 128;
  60         SkString text("ABCDEFGHIJ");
  61         draw_string(canvas, text, x, y, paint);
  62         y += 100;
  63         SkString text2("KLMNOPQRS");
  64         draw_string(canvas, text2, x, y, paint);
  65         y += 100;
  66         SkString text3("TUVWXYZ012");
  67         draw_string(canvas, text3, x, y, paint);
  68         y += 100;
  69         paint.setTypeface(fTypefaces[1]);
  70         draw_string(canvas, text, x, y, paint);
  71         y += 100;
  72         draw_string(canvas, text2, x, y, paint);
  73         y += 100;
  74         draw_string(canvas, text3, x, y, paint);
  75         y += 100;
  76     }
  77
  78 private:
  79     SkTypeface* fTypefaces[2];
  80     typedef GM INHERITED;
  81 };
  82
  83
  84 //////////////////////////////////////////////////////////////////////////////
  85
  86 DEF_GM( return SkNEW(FontCacheGM); )