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 "sk_tool_utils.h"
10 #include "SkCanvas.h"
11 #include "SkGradientShader.h"
12 #include "SkTypeface.h"
13
14 // test shader w/ transparency
make_grad(SkScalar width)15 static sk_sp<SkShader> make_grad(SkScalar width) {
16 SkColor colors[] = { SK_ColorRED, 0x0000FF00, SK_ColorBLUE };
17 SkPoint pts[] = { { 0, 0 }, { width, 0 } };
18 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
19 SkShader::kMirror_TileMode);
20 }
21
22 // test opaque shader
make_grad2(SkScalar width)23 static sk_sp<SkShader> make_grad2(SkScalar width) {
24 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
25 SkPoint pts[] = { { 0, 0 }, { width, 0 } };
26 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
27 SkShader::kMirror_TileMode);
28 }
29
make_chrome_solid()30 static sk_sp<SkShader> make_chrome_solid() {
31 SkColor colors[] = { SK_ColorGREEN, SK_ColorGREEN };
32 SkPoint pts[] = { { 0, 0 }, { 1, 0 } };
33 return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
34 }
35
36 namespace skiagm {
37
38 // Replicate chrome layout test - clipped pathed gradient-shaded text
39 class ChromeGradTextGM1 : public GM {
40 public:
ChromeGradTextGM1()41 ChromeGradTextGM1() { }
42 protected:
43
onShortName()44 virtual SkString onShortName() { return SkString("chrome_gradtext1"); }
onISize()45 virtual SkISize onISize() { return SkISize::Make(500, 480); }
onDraw(SkCanvas * canvas)46 virtual void onDraw(SkCanvas* canvas) {
47 SkPaint paint;
48 SkRect r = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
49
50 canvas->clipRect(r);
51
52 paint.setColor(SK_ColorRED);
53 canvas->drawRect(r, paint);
54
55 // Minimal repro doesn't require AA, LCD, or a nondefault typeface
56 paint.setShader(make_chrome_solid());
57
58 SkFont font(sk_tool_utils::create_portable_typeface(), 500);
59 font.setEdging(SkFont::Edging::kAlias);
60
61 canvas->drawString("I", 0, 100, font, paint);
62 }
63 private:
64 typedef GM INHERITED;
65 };
66
67
68 // Replicate chrome layout test - switching between solid & gradient text
69 class ChromeGradTextGM2 : public GM {
70 public:
ChromeGradTextGM2()71 ChromeGradTextGM2() { }
72 protected:
73
onShortName()74 virtual SkString onShortName() { return SkString("chrome_gradtext2"); }
onISize()75 virtual SkISize onISize() { return SkISize::Make(500, 480); }
onDraw(SkCanvas * canvas)76 virtual void onDraw(SkCanvas* canvas) {
77 SkPaint paint;
78 SkFont font(sk_tool_utils::create_portable_typeface());
79 font.setEdging(SkFont::Edging::kAlias);
80
81 paint.setStyle(SkPaint::kFill_Style);
82 canvas->drawString("Normal Fill Text", 0, 50, font, paint);
83 paint.setStyle(SkPaint::kStroke_Style);
84 canvas->drawString("Normal Stroke Text", 0, 100, font, paint);
85
86 // Minimal repro doesn't require AA, LCD, or a nondefault typeface
87 paint.setShader(make_chrome_solid());
88
89 paint.setStyle(SkPaint::kFill_Style);
90 canvas->drawString("Gradient Fill Text", 0, 150, font, paint);
91 paint.setStyle(SkPaint::kStroke_Style);
92 canvas->drawString("Gradient Stroke Text", 0, 200, font, paint);
93 }
94 private:
95 typedef GM INHERITED;
96 };
97
98 //////////////////////////////////////////////////////////////////////////////
99
100 DEF_GM( return new ChromeGradTextGM1; )
101 DEF_GM( return new ChromeGradTextGM2; )
102 }
103
104 DEF_SIMPLE_GM(gradtext, canvas, 500, 480) {
105 static constexpr float kTextSize = 26.0f;
106 SkFont font(sk_tool_utils::create_portable_typeface(), kTextSize);
107
108 canvas->drawRect({0, 0, 500, 240}, SkPaint());
109 canvas->translate(20.0f, kTextSize);
110
111 SkPaint paints[2];
112 paints[0].setShader(make_grad(80.0f));
113 paints[1].setShader(make_grad2(80.0f));
114
115 static const SkFont::Edging edgings[3] = {
116 SkFont::Edging::kAlias,
117 SkFont::Edging::kAntiAlias,
118 SkFont::Edging::kSubpixelAntiAlias,
119 };
120 for (int i = 0; i < 2; ++i) {
121 for (const SkPaint& paint : paints) {
122 for (SkFont::Edging edging : edgings) {
123 font.setEdging(edging);
124 canvas->drawString("When in the course of human events", 0, 0, font, paint);
125 canvas->translate(0, kTextSize * 4/3);
126 }
127 canvas->translate(0, kTextSize * 2/3);
128 }
129 }
130 }
131