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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 "sk_tool_utils.h"
10 #include "SkCanvas.h"
11 #include "SkPath.h"
12 #include "SkGradientShader.h"
13 #include "SkTypeface.h"
14 
make_heatGradient(const SkPoint pts[2])15 static sk_sp<SkShader> make_heatGradient(const SkPoint pts[2]) {
16     const SkColor bw[] = { SK_ColorBLACK, SK_ColorWHITE };
17 
18     return SkGradientShader::MakeLinear(pts, bw, nullptr, SK_ARRAY_COUNT(bw),
19                                         SkShader::kClamp_TileMode);
20 }
21 
setFont(SkPaint * paint,const char name[])22 static bool setFont(SkPaint* paint, const char name[]) {
23     paint->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle()));
24     return SkToBool(paint->getTypeface());
25 }
26 
27 /**
28    Test a set of clipping problems discovered while writing blitAntiRect,
29    and test all the code paths through the clipping blitters.
30    Each region should show as a blue center surrounded by a 2px green
31    border, with no red.
32 */
33 
34 #define HEIGHT 480
35 
36 class GammaTextGM : public skiagm::GM {
37 protected:
onShortName()38     SkString onShortName() override {
39         SkString name("gammatext");
40         name.append(sk_tool_utils::major_platform_os_name());
41         return name;
42     }
43 
onISize()44     SkISize onISize() override {
45         return SkISize::Make(1024, HEIGHT);
46     }
47 
drawGrad(SkCanvas * canvas)48     static void drawGrad(SkCanvas* canvas) {
49         const SkPoint pts[] = { { 0, 0 }, { 0, SkIntToScalar(HEIGHT) } };
50 
51         canvas->clear(SK_ColorRED);
52         SkPaint paint;
53         paint.setShader(make_heatGradient(pts));
54         SkRect r = { 0, 0, SkIntToScalar(1024), SkIntToScalar(HEIGHT) };
55         canvas->drawRect(r, paint);
56     }
57 
onDraw(SkCanvas * canvas)58     void onDraw(SkCanvas* canvas) override {
59         drawGrad(canvas);
60 
61         const SkColor fg[] = {
62             0xFFFFFFFF,
63             0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
64             0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
65             0xFF000000,
66         };
67 
68         const char* text = "Hamburgefons";
69         size_t len = strlen(text);
70 
71         SkPaint paint;
72         setFont(&paint, sk_tool_utils::platform_font_name("serif"));
73         paint.setTextSize(SkIntToScalar(16));
74         paint.setAntiAlias(true);
75         paint.setLCDRenderText(true);
76 
77         SkScalar x = SkIntToScalar(10);
78         for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
79             paint.setColor(fg[i]);
80 
81             SkScalar y = SkIntToScalar(40);
82             SkScalar stopy = SkIntToScalar(HEIGHT);
83             while (y < stopy) {
84                 canvas->drawText(text, len, x, y, paint);
85                 y += paint.getTextSize() * 2;
86             }
87             x += SkIntToScalar(1024) / SK_ARRAY_COUNT(fg);
88         }
89     }
90 
91 private:
92     typedef skiagm::GM INHERITED;
93 };
94 
DEF_GM(return new GammaTextGM;)95 DEF_GM( return new GammaTextGM; )
96 
97 //////////////////////////////////////////////////////////////////////////////
98 
99 static sk_sp<SkShader> make_gradient(SkColor c) {
100     const SkPoint pts[] = { { 0, 0 }, { 240, 0 } };
101     SkColor colors[2];
102     colors[0] = c;
103     colors[1] = SkColorSetA(c, 0);
104     return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode);
105 }
106 
set_face(SkPaint * paint)107 static void set_face(SkPaint* paint) {
108     paint->setTypeface(SkTypeface::MakeFromName("serif",
109                            SkFontStyle::FromOldStyle(SkTypeface::kItalic)));
110 }
111 
draw_pair(SkCanvas * canvas,SkPaint * paint,const sk_sp<SkShader> & shader)112 static void draw_pair(SkCanvas* canvas, SkPaint* paint, const sk_sp<SkShader>& shader) {
113     const char text[] = "Now is the time for all good";
114     const size_t len = strlen(text);
115 
116     paint->setShader(nullptr);
117     canvas->drawText(text, len, 10, 20, *paint);
118     paint->setShader(SkShader::MakeColorShader(paint->getColor()));
119     canvas->drawText(text, len, 10, 40, *paint);
120     paint->setShader(shader);
121     canvas->drawText(text, len, 10, 60, *paint);
122 }
123 
124 class GammaShaderTextGM : public skiagm::GM {
125     sk_sp<SkShader> fShaders[3];
126     SkColor fColors[3];
127 
128 public:
GammaShaderTextGM()129     GammaShaderTextGM() {
130         const SkColor colors[] = { SK_ColorBLACK, SK_ColorRED, SK_ColorBLUE };
131         for (size_t i = 0; i < SK_ARRAY_COUNT(fShaders); ++i) {
132             fColors[i] = colors[i];
133         }
134     }
135 
136 protected:
onShortName()137     SkString onShortName() override {
138         return SkString("gammagradienttext");
139     }
140 
onISize()141     SkISize onISize() override {
142         return SkISize::Make(300, 300);
143     }
144 
onOnceBeforeDraw()145     void onOnceBeforeDraw() override {
146         for (size_t i = 0; i < SK_ARRAY_COUNT(fShaders); ++i) {
147             fShaders[i] = make_gradient(fColors[i]);
148         }
149     }
150 
onDraw(SkCanvas * canvas)151     void onDraw(SkCanvas* canvas) override {
152         SkPaint paint;
153         paint.setAntiAlias(true);
154         paint.setLCDRenderText(true);
155         paint.setTextSize(18);
156         set_face(&paint);
157 
158         for (size_t i = 0; i < SK_ARRAY_COUNT(fShaders); ++i) {
159             paint.setColor(fColors[i]);
160             draw_pair(canvas, &paint, fShaders[i]);
161             canvas->translate(0, 80);
162         }
163     }
164 
165 private:
166     typedef skiagm::GM INHERITED;
167 };
168 
169 DEF_GM( return new GammaShaderTextGM; )
170