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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 <SkFont.h>
      8 #include "gm.h"
      9 #include "Resources.h"
     10 #include "SkFixed.h"
     11 #include "SkFontDescriptor.h"
     12 #include "SkFontMgr.h"
     13 #include "SkTypeface.h"
     14 
     15 namespace skiagm {
     16 
     17 class FontScalerDistortableGM : public GM {
     18 public:
     19     FontScalerDistortableGM() {
     20         this->setBGColor(0xFFFFFFFF);
     21     }
     22 
     23 protected:
     24 
     25     SkString onShortName() override {
     26         return SkString("fontscalerdistortable");
     27     }
     28 
     29     SkISize onISize() override {
     30         return SkISize::Make(550, 700);
     31     }
     32 
     33     DrawResult onDraw(SkCanvas* canvas, SkString* errorMsg) override {
     34         SkPaint paint;
     35         paint.setAntiAlias(true);
     36         SkFont font;
     37         font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
     38         sk_sp<SkFontMgr> fontMgr(SkFontMgr::RefDefault());
     39 
     40         std::unique_ptr<SkStreamAsset> distortableStream(GetResourceAsStream("fonts/Distortable.ttf"));
     41         sk_sp<SkTypeface> distortable(MakeResourceAsTypeface("fonts/Distortable.ttf"));
     42 
     43         if (!distortableStream) {
     44             *errorMsg = "No distortableStream";
     45             return DrawResult::kFail;
     46         }
     47         const char* text = "abc";
     48         const size_t textLen = strlen(text);
     49 
     50         for (int j = 0; j < 2; ++j) {
     51             for (int i = 0; i < 5; ++i) {
     52                 SkScalar x = SkIntToScalar(10);
     53                 SkScalar y = SkIntToScalar(20);
     54 
     55                 SkFourByteTag tag = SkSetFourByteTag('w','g','h','t');
     56                 SkScalar styleValue = SkDoubleToScalar(0.5 + (5 * j + i) * ((2.0 - 0.5) / (2 * 5)));
     57                 SkFontArguments::VariationPosition::Coordinate coordinates[] = {{tag, styleValue}};
     58                 SkFontArguments::VariationPosition position =
     59                         { coordinates, SK_ARRAY_COUNT(coordinates) };
     60                 if (j == 0 && distortable) {
     61                     font.setTypeface(sk_sp<SkTypeface>(
     62                         distortable->makeClone(
     63                             SkFontArguments().setVariationDesignPosition(position))));
     64                 } else {
     65                     font.setTypeface(sk_sp<SkTypeface>(fontMgr->makeFromStream(
     66                         distortableStream->duplicate(),
     67                         SkFontArguments().setVariationDesignPosition(position))));
     68                 }
     69 
     70                 SkAutoCanvasRestore acr(canvas, true);
     71                 canvas->translate(SkIntToScalar(30 + i * 100), SkIntToScalar(20));
     72                 canvas->rotate(SkIntToScalar(i * 5), x, y * 10);
     73 
     74                 {
     75                     SkPaint p;
     76                     p.setAntiAlias(true);
     77                     SkRect r;
     78                     r.set(x - SkIntToScalar(3), SkIntToScalar(15),
     79                           x - SkIntToScalar(1), SkIntToScalar(280));
     80                     canvas->drawRect(r, p);
     81                 }
     82 
     83                 for (int ps = 6; ps <= 22; ps++) {
     84                     font.setSize(SkIntToScalar(ps));
     85                     canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, x, y, font, paint);
     86                     y += font.getMetrics(nullptr);
     87                 }
     88             }
     89             canvas->translate(0, SkIntToScalar(360));
     90             font.setSubpixel(true);
     91         }
     92         return DrawResult::kOk;
     93     }
     94 
     95 private:
     96     typedef GM INHERITED;
     97 };
     98 
     99 //////////////////////////////////////////////////////////////////////////////
    100 
    101 DEF_GM( return new FontScalerDistortableGM; )
    102 
    103 }
    104