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      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 }
     94