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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkFont.h"
12 #include "include/core/SkPaint.h"
13 #include "include/core/SkPoint.h"
14 #include "include/core/SkRect.h"
15 #include "include/core/SkRefCnt.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkShader.h"
18 #include "include/core/SkSize.h"
19 #include "include/core/SkString.h"
20 #include "include/core/SkTileMode.h"
21 #include "include/core/SkTypeface.h"
22 #include "include/core/SkTypes.h"
23 #include "include/effects/SkGradientShader.h"
24 #include "tools/ToolUtils.h"
25 #include "tools/fonts/FontToolUtils.h"
26
27 namespace {
28
29 // test shader w/ transparency
make_grad(SkScalar width)30 static sk_sp<SkShader> make_grad(SkScalar width) {
31 SkColor colors[] = { SK_ColorRED, 0x0000FF00, SK_ColorBLUE };
32 SkPoint pts[] = { { 0, 0 }, { width, 0 } };
33 return SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
34 SkTileMode::kMirror);
35 }
36
37 // test opaque shader
make_grad2(SkScalar width)38 static sk_sp<SkShader> make_grad2(SkScalar width) {
39 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
40 SkPoint pts[] = { { 0, 0 }, { width, 0 } };
41 return SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
42 SkTileMode::kMirror);
43 }
44
make_chrome_solid()45 static sk_sp<SkShader> make_chrome_solid() {
46 SkColor colors[] = { SK_ColorGREEN, SK_ColorGREEN };
47 SkPoint pts[] = { { 0, 0 }, { 1, 0 } };
48 return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp);
49 }
50
51 // Replicate chrome layout test - clipped pathed gradient-shaded text
52 class ChromeGradTextGM1 : public skiagm::GM {
getName() const53 SkString getName() const override { return SkString("chrome_gradtext1"); }
54
getISize()55 SkISize getISize() override { return {500, 480}; }
56
onDraw(SkCanvas * canvas)57 void onDraw(SkCanvas* canvas) override {
58 SkPaint paint;
59 SkRect r = SkRect::MakeWH(SkIntToScalar(100), SkIntToScalar(100));
60
61 canvas->clipRect(r);
62
63 paint.setColor(SK_ColorRED);
64 canvas->drawRect(r, paint);
65
66 // Minimal repro doesn't require AA, LCD, or a nondefault typeface
67 paint.setShader(make_chrome_solid());
68
69 SkFont font(ToolUtils::DefaultPortableTypeface(), 500);
70 font.setEdging(SkFont::Edging::kAlias);
71
72 canvas->drawString("I", 0, 100, font, paint);
73 }
74 };
75
76 // Replicate chrome layout test - switching between solid & gradient text
77 class ChromeGradTextGM2 : public skiagm::GM {
getName() const78 SkString getName() const override { return SkString("chrome_gradtext2"); }
79
getISize()80 SkISize getISize() override { return {500, 480}; }
81
onDraw(SkCanvas * canvas)82 void onDraw(SkCanvas* canvas) override {
83 SkPaint paint;
84 SkFont font = ToolUtils::DefaultPortableFont();
85 font.setEdging(SkFont::Edging::kAlias);
86
87 paint.setStyle(SkPaint::kFill_Style);
88 canvas->drawString("Normal Fill Text", 0, 50, font, paint);
89 paint.setStyle(SkPaint::kStroke_Style);
90 canvas->drawString("Normal Stroke Text", 0, 100, font, paint);
91
92 // Minimal repro doesn't require AA, LCD, or a nondefault typeface
93 paint.setShader(make_chrome_solid());
94
95 paint.setStyle(SkPaint::kFill_Style);
96 canvas->drawString("Gradient Fill Text", 0, 150, font, paint);
97 paint.setStyle(SkPaint::kStroke_Style);
98 canvas->drawString("Gradient Stroke Text", 0, 200, font, paint);
99 }
100 };
101 } // namespace
102
103 DEF_GM( return new ChromeGradTextGM1; )
DEF_GM(return new ChromeGradTextGM2;)104 DEF_GM( return new ChromeGradTextGM2; )
105
106 DEF_SIMPLE_GM(gradtext, canvas, 500, 480) {
107 static constexpr float kTextSize = 26.0f;
108 SkFont font(ToolUtils::DefaultPortableTypeface(), kTextSize);
109
110 canvas->drawRect({0, 0, 500, 240}, SkPaint());
111 canvas->translate(20.0f, kTextSize);
112
113 SkPaint paints[2];
114 paints[0].setShader(make_grad(80.0f));
115 paints[1].setShader(make_grad2(80.0f));
116
117 static const SkFont::Edging edgings[3] = {
118 SkFont::Edging::kAlias,
119 SkFont::Edging::kAntiAlias,
120 SkFont::Edging::kSubpixelAntiAlias,
121 };
122 for (int i = 0; i < 2; ++i) {
123 for (const SkPaint& paint : paints) {
124 for (SkFont::Edging edging : edgings) {
125 font.setEdging(edging);
126 canvas->drawString("When in the course of human events", 0, 0, font, paint);
127 canvas->translate(0, kTextSize * 4/3);
128 }
129 canvas->translate(0, kTextSize * 2/3);
130 }
131 }
132 }
133