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      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 make_isize(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 make_isize(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 
    104     virtual SkString onShortName() {
    105         return SkString("gradtext");
    106     }
    107 
    108     virtual SkISize onISize() { return make_isize(500, 480); }
    109 
    110     static void draw_text(SkCanvas* canvas, const SkPaint& paint) {
    111         const char* text = "When in the course of human events";
    112         size_t len = strlen(text);
    113         canvas->drawText(text, len, 0, 0, paint);
    114     }
    115 
    116     static void draw_text3(SkCanvas* canvas, const SkPaint& paint) {
    117         SkPaint p(paint);
    118 
    119         p.setAntiAlias(false);
    120         draw_text(canvas, p);
    121         p.setAntiAlias(true);
    122         canvas->translate(0, paint.getTextSize() * 4/3);
    123         draw_text(canvas, p);
    124         p.setLCDRenderText(true);
    125         canvas->translate(0, paint.getTextSize() * 4/3);
    126         draw_text(canvas, p);
    127     }
    128 
    129     virtual void onDraw(SkCanvas* canvas) {
    130         SkPaint paint;
    131         paint.setTextSize(SkIntToScalar(26));
    132 
    133         const SkISize& size = this->getISize();
    134         SkRect r = SkRect::MakeWH(SkIntToScalar(size.width()),
    135                                   SkIntToScalar(size.height()) / 2);
    136         canvas->drawRect(r, paint);
    137 
    138         canvas->translate(SkIntToScalar(20), paint.getTextSize());
    139 
    140         for (int i = 0; i < 2; ++i) {
    141             paint.setShader(make_grad(SkIntToScalar(80)))->unref();
    142             draw_text3(canvas, paint);
    143 
    144             canvas->translate(0, paint.getTextSize() * 2);
    145 
    146             paint.setShader(make_grad2(SkIntToScalar(80)))->unref();
    147             draw_text3(canvas, paint);
    148 
    149             canvas->translate(0, paint.getTextSize() * 2);
    150         }
    151     }
    152 
    153 private:
    154     typedef GM INHERITED;
    155 };
    156 
    157 //////////////////////////////////////////////////////////////////////////////
    158 
    159 static GM* MyFactory(void*) { return new GradTextGM; }
    160 static GM* CMyFactory(void*) { return new ChromeGradTextGM1; }
    161 static GM* CMyFactory2(void*) { return new ChromeGradTextGM2; }
    162 
    163 static GMRegistry reg(MyFactory);
    164 static GMRegistry Creg(CMyFactory);
    165 static GMRegistry Creg2(CMyFactory2);
    166 }
    167