gm/fontscalerdistortable.cpp

   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 protected:
  23
  24     SkString onShortName() override {
  25         return SkString("fontscalerdistortable");
  26     }
  27
  28     SkISize onISize() override {
  29         return SkISize::Make(550, 700);
  30     }
  31
  32     void onDraw(SkCanvas* canvas) override {
  33         SkPaint paint;
  34         paint.setAntiAlias(true);
  35         paint.setLCDRenderText(true);
  36         sk_sp<SkFontMgr> fontMgr(SkFontMgr::RefDefault());
  37
  38         std::unique_ptr<SkStreamAsset> distortable(GetResourceAsStream("/fonts/Distortable.ttf"));
  39         if (!distortable) {
  40             return;
  41         }
  42         const char* text = "abc";
  43         const size_t textLen = strlen(text);
  44
  45         for (int j = 0; j < 2; ++j) {
  46             for (int i = 0; i < 5; ++i) {
  47                 SkScalar x = SkIntToScalar(10);
  48                 SkScalar y = SkIntToScalar(20);
  49
  50                 SkFourByteTag tag = SkSetFourByteTag('w','g','h','t');
  51                 SkScalar styleValue = SkDoubleToScalar(0.5 + (5*j + i) * ((2.0 - 0.5) / (2 * 5)));
  52                 SkFontArguments::VariationPosition::Coordinate coordinates[] = {{tag, styleValue}};
  53                 SkFontArguments::VariationPosition position =
  54                         { coordinates, SK_ARRAY_COUNT(coordinates) };
  55                 paint.setTypeface(sk_sp<SkTypeface>(fontMgr->createFromStream(
  56                         distortable->duplicate(),
  57                         SkFontArguments().setVariationDesignPosition(position))));
  58
  59                 SkAutoCanvasRestore acr(canvas, true);
  60                 canvas->translate(SkIntToScalar(30 + i * 100), SkIntToScalar(20));
  61                 canvas->rotate(SkIntToScalar(i * 5), x, y * 10);
  62
  63                 {
  64                     SkPaint p;
  65                     p.setAntiAlias(true);
  66                     SkRect r;
  67                     r.set(x - SkIntToScalar(3), SkIntToScalar(15),
  68                           x - SkIntToScalar(1), SkIntToScalar(280));
  69                     canvas->drawRect(r, p);
  70                 }
  71
  72                 for (int ps = 6; ps <= 22; ps++) {
  73                     paint.setTextSize(SkIntToScalar(ps));
  74                     canvas->drawText(text, textLen, x, y, paint);
  75                     y += paint.getFontMetrics(nullptr);
  76                 }
  77             }
  78             canvas->translate(0, SkIntToScalar(360));
  79             paint.setSubpixelText(true);
  80         }
  81     }
  82
  83 private:
  84     typedef GM INHERITED;
  85 };
  86
  87 //////////////////////////////////////////////////////////////////////////////
  88
  89 static GM* MyFactory(void*) { return new FontScalerDistortableGM; }
  90 static GMRegistry reg(MyFactory);
  91
  92 }