gm/fontscaler.cpp

   1 /*
   2  * Copyright 2011 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 #include "gm.h"
   8 #include "SkTypeface.h"
   9
  10 namespace skiagm {
  11
  12 class FontScalerGM : public GM {
  13 public:
  14     FontScalerGM() {
  15         this->setBGColor(0xFFFFFFFF);
  16     }
  17
  18     virtual ~FontScalerGM() {
  19     }
  20
  21 protected:
  22
  23     SkString onShortName() override {
  24         SkString name("fontscaler");
  25         name.append(sk_tool_utils::major_platform_os_name());
  26         return name;
  27     }
  28
  29     SkISize onISize() override {
  30         return SkISize::Make(1450, 750);
  31     }
  32
  33     static void rotate_about(SkCanvas* canvas,
  34                              SkScalar degrees,
  35                              SkScalar px, SkScalar py) {
  36         canvas->translate(px, py);
  37         canvas->rotate(degrees);
  38         canvas->translate(-px, -py);
  39     }
  40
  41     void onDraw(SkCanvas* canvas) override {
  42         SkPaint paint;
  43
  44         paint.setAntiAlias(true);
  45         paint.setLCDRenderText(true);
  46         //With freetype the default (normal hinting) can be really ugly.
  47         //Most distros now set slight (vertical hinting only) in any event.
  48         paint.setHinting(SkPaint::kSlight_Hinting);
  49
  50         const char* text = "Hamburgefons ooo mmm";
  51         const size_t textLen = strlen(text);
  52
  53         for (int j = 0; j < 2; ++j) {
  54             // This used to do 6 iterations but it causes the N4 to crash in the MSAA4 config.
  55             for (int i = 0; i < 5; ++i) {
  56                 SkScalar x = SkIntToScalar(10);
  57                 SkScalar y = SkIntToScalar(20);
  58
  59                 SkAutoCanvasRestore acr(canvas, true);
  60                 canvas->translate(SkIntToScalar(50 + i * 230),
  61                                   SkIntToScalar(20));
  62                 rotate_about(canvas, SkIntToScalar(i * 5), x, y * 10);
  63
  64                 {
  65                     SkPaint p;
  66                     p.setAntiAlias(true);
  67                     SkRect r;
  68                     r.set(x - SkIntToScalar(3), SkIntToScalar(15),
  69                           x - SkIntToScalar(1), SkIntToScalar(280));
  70                     canvas->drawRect(r, p);
  71                 }
  72
  73                 for (int ps = 6; ps <= 22; ps++) {
  74                     paint.setTextSize(SkIntToScalar(ps));
  75                     canvas->drawText(text, textLen, x, y, paint);
  76                     y += paint.getFontMetrics(nullptr);
  77                 }
  78             }
  79             canvas->translate(0, SkIntToScalar(360));
  80             paint.setSubpixelText(true);
  81         }
  82     }
  83
  84 private:
  85     typedef GM INHERITED;
  86 };
  87
  88 //////////////////////////////////////////////////////////////////////////////
  89
  90 static GM* MyFactory(void*) { return new FontScalerGM; }
  91 static GMRegistry reg(MyFactory);
  92
  93 }