src/third_party/skia/gm/gradtext.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
   8 #include "gm.h"
   9 #include "SkCanvas.h"
  10 #include "SkGradientShader.h"
  11 #include "SkTypeface.h"
  12
  13 // test shader w/ transparency
  14 static SkShader* make_grad(SkScalar width) {
  15     SkColor colors[] = { SK_ColorRED, 0x0000FF00, SK_ColorBLUE };
  16     SkPoint pts[] = { { 0, 0 }, { width, 0 } };
  17     return SkGradientShader::CreateLinear(pts, colors, NULL,
  18                                           SK_ARRAY_COUNT(colors),
  19                                           SkShader::kMirror_TileMode);
  20 }
  21
  22 // test opaque shader
  23 static SkShader* make_grad2(SkScalar width) {
  24     SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
  25     SkPoint pts[] = { { 0, 0 }, { width, 0 } };
  26     return SkGradientShader::CreateLinear(pts, colors, NULL,
  27                                           SK_ARRAY_COUNT(colors),
  28                                           SkShader::kMirror_TileMode);
  29 }
  30
  31 static SkShader* make_chrome_solid() {
  32     SkColor colors[] = { SK_ColorGREEN, SK_ColorGREEN };
  33     SkPoint pts[] = { { 0, 0 }, { 1, 0 } };
  34     return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
  35                                           SkShader::kClamp_TileMode);
  36 }
  37
  38 namespace skiagm {
  39
  40 // Replicate chrome layout test - clipped pathed gradient-shaded text
  41 class ChromeGradTextGM1 : public GM {
  42 public:
  43     ChromeGradTextGM1() { }
  44 protected:
  45
  46     virtual SkString onShortName() { return SkString("chrome_gradtext1"); }
  47     virtual SkISize onISize() { return SkISize::Make(500, 480); }
  48     virtual void onDraw(SkCanvas* canvas) {
  49         SkPaint paint;
  50         SkRect r = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
  51
  52         canvas->clipRect(r);
  53
  54         paint.setColor(SK_ColorRED);
  55         canvas->drawRect(r, paint);
  56
  57         // Minimal repro doesn't require AA, LCD, or a nondefault typeface
  58         paint.setShader(make_chrome_solid())->unref();
  59         paint.setTextSize(SkIntToScalar(500));
  60
  61         canvas->drawText("I", 1, 0, 100, paint);
  62     }
  63 private:
  64     typedef GM INHERITED;
  65 };
  66
  67
  68 // Replicate chrome layout test - switching between solid & gadient text
  69 class ChromeGradTextGM2 : public GM {
  70 public:
  71     ChromeGradTextGM2() { }
  72 protected:
  73
  74     virtual SkString onShortName() { return SkString("chrome_gradtext2"); }
  75     virtual SkISize onISize() { return SkISize::Make(500, 480); }
  76     virtual void onDraw(SkCanvas* canvas) {
  77         SkPaint paint;
  78
  79         paint.setStyle(SkPaint::kFill_Style);
  80         canvas->drawText("Normal Fill Text", 16, 0, 50, paint);
  81         paint.setStyle(SkPaint::kStroke_Style);
  82         canvas->drawText("Normal Stroke Text", 18, 0, 100, paint);
  83
  84         // Minimal repro doesn't require AA, LCD, or a nondefault typeface
  85         paint.setShader(make_chrome_solid())->unref();
  86
  87         paint.setStyle(SkPaint::kFill_Style);
  88         canvas->drawText("Gradient Fill Text", 18, 0, 150, paint);
  89         paint.setStyle(SkPaint::kStroke_Style);
  90         canvas->drawText("Gradient Stroke Text", 20, 0, 200, paint);
  91     }
  92 private:
  93     typedef GM INHERITED;
  94 };
  95
  96
  97
  98 class GradTextGM : public GM {
  99 public:
 100     GradTextGM () {}
 101
 102 protected:
 103     virtual uint32_t onGetFlags() const SK_OVERRIDE {
 104         return kSkipTiled_Flag;
 105     }
 106
 107
 108     virtual SkString onShortName() {
 109         return SkString("gradtext");
 110     }
 111
 112     virtual SkISize onISize() { return SkISize::Make(500, 480); }
 113
 114     static void draw_text(SkCanvas* canvas, const SkPaint& paint) {
 115         const char* text = "When in the course of human events";
 116         size_t len = strlen(text);
 117         canvas->drawText(text, len, 0, 0, paint);
 118     }
 119
 120     static void draw_text3(SkCanvas* canvas, const SkPaint& paint) {
 121         SkPaint p(paint);
 122
 123         p.setAntiAlias(false);
 124         draw_text(canvas, p);
 125         p.setAntiAlias(true);
 126         canvas->translate(0, paint.getTextSize() * 4/3);
 127         draw_text(canvas, p);
 128         p.setLCDRenderText(true);
 129         canvas->translate(0, paint.getTextSize() * 4/3);
 130         draw_text(canvas, p);
 131     }
 132
 133     virtual void onDraw(SkCanvas* canvas) {
 134         SkPaint paint;
 135         paint.setTextSize(SkIntToScalar(26));
 136
 137         const SkISize& size = this->getISize();
 138         SkRect r = SkRect::MakeWH(SkIntToScalar(size.width()),
 139                                   SkIntToScalar(size.height()) / 2);
 140         canvas->drawRect(r, paint);
 141
 142         canvas->translate(SkIntToScalar(20), paint.getTextSize());
 143
 144         for (int i = 0; i < 2; ++i) {
 145             paint.setShader(make_grad(SkIntToScalar(80)))->unref();
 146             draw_text3(canvas, paint);
 147
 148             canvas->translate(0, paint.getTextSize() * 2);
 149
 150             paint.setShader(make_grad2(SkIntToScalar(80)))->unref();
 151             draw_text3(canvas, paint);
 152
 153             canvas->translate(0, paint.getTextSize() * 2);
 154         }
 155     }
 156
 157 private:
 158     typedef GM INHERITED;
 159 };
 160
 161 //////////////////////////////////////////////////////////////////////////////
 162
 163 static GM* MyFactory(void*) { return new GradTextGM; }
 164 static GM* CMyFactory(void*) { return new ChromeGradTextGM1; }
 165 static GM* CMyFactory2(void*) { return new ChromeGradTextGM2; }
 166
 167 static GMRegistry reg(MyFactory);
 168 static GMRegistry Creg(CMyFactory);
 169 static GMRegistry Creg2(CMyFactory2);
 170 }