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         sk_tool_utils::set_portable_typeface(&paint);
  51         SkRect r = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
  52
  53         canvas->clipRect(r);
  54
  55         paint.setColor(SK_ColorRED);
  56         canvas->drawRect(r, paint);
  57
  58         // Minimal repro doesn't require AA, LCD, or a nondefault typeface
  59         paint.setShader(make_chrome_solid())->unref();
  60         paint.setTextSize(SkIntToScalar(500));
  61
  62         canvas->drawText("I", 1, 0, 100, paint);
  63     }
  64 private:
  65     typedef GM INHERITED;
  66 };
  67
  68
  69 // Replicate chrome layout test - switching between solid & gadient text
  70 class ChromeGradTextGM2 : public GM {
  71 public:
  72     ChromeGradTextGM2() { }
  73 protected:
  74
  75     virtual SkString onShortName() { return SkString("chrome_gradtext2"); }
  76     virtual SkISize onISize() { return SkISize::Make(500, 480); }
  77     virtual void onDraw(SkCanvas* canvas) {
  78         SkPaint paint;
  79         sk_tool_utils::set_portable_typeface(&paint);
  80
  81         paint.setStyle(SkPaint::kFill_Style);
  82         canvas->drawText("Normal Fill Text", 16, 0, 50, paint);
  83         paint.setStyle(SkPaint::kStroke_Style);
  84         canvas->drawText("Normal Stroke Text", 18, 0, 100, paint);
  85
  86         // Minimal repro doesn't require AA, LCD, or a nondefault typeface
  87         paint.setShader(make_chrome_solid())->unref();
  88
  89         paint.setStyle(SkPaint::kFill_Style);
  90         canvas->drawText("Gradient Fill Text", 18, 0, 150, paint);
  91         paint.setStyle(SkPaint::kStroke_Style);
  92         canvas->drawText("Gradient Stroke Text", 20, 0, 200, paint);
  93     }
  94 private:
  95     typedef GM INHERITED;
  96 };
  97
  98
  99
 100 class GradTextGM : public GM {
 101 public:
 102     GradTextGM () {}
 103
 104 protected:
 105     virtual SkString onShortName() {
 106         return SkString("gradtext");
 107     }
 108
 109     virtual SkISize onISize() { return SkISize::Make(500, 480); }
 110
 111     static void draw_text(SkCanvas* canvas, const SkPaint& paint) {
 112         const char* text = "When in the course of human events";
 113         size_t len = strlen(text);
 114         canvas->drawText(text, len, 0, 0, paint);
 115     }
 116
 117     static void draw_text3(SkCanvas* canvas, const SkPaint& paint) {
 118         SkPaint p(paint);
 119
 120         p.setAntiAlias(false);
 121         draw_text(canvas, p);
 122         p.setAntiAlias(true);
 123         canvas->translate(0, paint.getTextSize() * 4/3);
 124         draw_text(canvas, p);
 125         p.setLCDRenderText(true);
 126         canvas->translate(0, paint.getTextSize() * 4/3);
 127         draw_text(canvas, p);
 128     }
 129
 130     virtual void onDraw(SkCanvas* canvas) {
 131         SkPaint paint;
 132         sk_tool_utils::set_portable_typeface(&paint);
 133         paint.setTextSize(SkIntToScalar(26));
 134
 135         const SkISize& size = this->getISize();
 136         SkRect r = SkRect::MakeWH(SkIntToScalar(size.width()),
 137                                   SkIntToScalar(size.height()) / 2);
 138         canvas->drawRect(r, paint);
 139
 140         canvas->translate(SkIntToScalar(20), paint.getTextSize());
 141
 142         for (int i = 0; i < 2; ++i) {
 143             paint.setShader(make_grad(SkIntToScalar(80)))->unref();
 144             draw_text3(canvas, paint);
 145
 146             canvas->translate(0, paint.getTextSize() * 2);
 147
 148             paint.setShader(make_grad2(SkIntToScalar(80)))->unref();
 149             draw_text3(canvas, paint);
 150
 151             canvas->translate(0, paint.getTextSize() * 2);
 152         }
 153     }
 154
 155 private:
 156     typedef GM INHERITED;
 157 };
 158
 159 //////////////////////////////////////////////////////////////////////////////
 160
 161 static GM* MyFactory(void*) { return new GradTextGM; }
 162 static GM* CMyFactory(void*) { return new ChromeGradTextGM1; }
 163 static GM* CMyFactory2(void*) { return new ChromeGradTextGM2; }
 164
 165 static GMRegistry reg(MyFactory);
 166 static GMRegistry Creg(CMyFactory);
 167 static GMRegistry Creg2(CMyFactory2);
 168 }