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      1 /*
      2  * Copyright 2015 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 "Resources.h"
      9 #include "SkFixed.h"
     10 #include "SkFontDescriptor.h"
     11 #include "SkFontMgr.h"
     12 #include "SkTypeface.h"
     13 
     14 namespace skiagm {
     15 
     16 class FontScalerDistortableGM : public GM {
     17 public:
     18     FontScalerDistortableGM() {
     19         this->setBGColor(0xFFFFFFFF);
     20     }
     21 
     22     virtual ~FontScalerDistortableGM() { }
     23 
     24 protected:
     25 
     26     SkString onShortName() override {
     27         return SkString("fontscalerdistortable");
     28     }
     29 
     30     SkISize onISize() override {
     31         return SkISize::Make(550, 700);
     32     }
     33 
     34     static void rotate_about(SkCanvas* canvas, SkScalar degrees, SkScalar px, SkScalar py) {
     35         canvas->translate(px, py);
     36         canvas->rotate(degrees);
     37         canvas->translate(-px, -py);
     38     }
     39 
     40     void onDraw(SkCanvas* canvas) override {
     41         SkPaint paint;
     42         paint.setAntiAlias(true);
     43         paint.setLCDRenderText(true);
     44         SkAutoTUnref<SkFontMgr> fontMgr(SkFontMgr::RefDefault());
     45 
     46         SkAutoTDelete<SkStreamAsset> distortable(GetResourceAsStream("/fonts/Distortable.ttf"));
     47         if (!distortable) {
     48             return;
     49         }
     50         const char* text = "abc";
     51         const size_t textLen = strlen(text);
     52 
     53         for (int j = 0; j < 2; ++j) {
     54             for (int i = 0; i < 5; ++i) {
     55                 SkScalar x = SkIntToScalar(10);
     56                 SkScalar y = SkIntToScalar(20);
     57 
     58                 SkFourByteTag tag = SkSetFourByteTag('w','g','h','t');
     59                 SkScalar styleValue = SkDoubleToScalar(0.5 + (5*j + i) * ((2.0 - 0.5) / (2 * 5)));
     60                 SkFontMgr::FontParameters::Axis axes[] = { { tag, styleValue } };
     61                 SkAutoTUnref<SkTypeface> typeface(fontMgr->createFromStream(
     62                     distortable->duplicate(), SkFontMgr::FontParameters().setAxes(axes, 1)));
     63                 paint.setTypeface(typeface);
     64 
     65                 SkAutoCanvasRestore acr(canvas, true);
     66                 canvas->translate(SkIntToScalar(30 + i * 100), SkIntToScalar(20));
     67                 rotate_about(canvas, SkIntToScalar(i * 5), x, y * 10);
     68 
     69                 {
     70                     SkPaint p;
     71                     p.setAntiAlias(true);
     72                     SkRect r;
     73                     r.set(x - SkIntToScalar(3), SkIntToScalar(15),
     74                           x - SkIntToScalar(1), SkIntToScalar(280));
     75                     canvas->drawRect(r, p);
     76                 }
     77 
     78                 for (int ps = 6; ps <= 22; ps++) {
     79                     paint.setTextSize(SkIntToScalar(ps));
     80                     canvas->drawText(text, textLen, x, y, paint);
     81                     y += paint.getFontMetrics(nullptr);
     82                 }
     83             }
     84             canvas->translate(0, SkIntToScalar(360));
     85             paint.setSubpixelText(true);
     86         }
     87     }
     88 
     89 private:
     90     typedef GM INHERITED;
     91 };
     92 
     93 //////////////////////////////////////////////////////////////////////////////
     94 
     95 static GM* MyFactory(void*) { return new FontScalerDistortableGM; }
     96 static GMRegistry reg(MyFactory);
     97 
     98 }
     99