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      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;)
     82