1 /*
2 * Copyright 2012 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/SkBlendMode.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkImageInfo.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkPath.h"
16 #include "include/core/SkPoint.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkRefCnt.h"
19 #include "include/core/SkScalar.h"
20 #include "include/core/SkShader.h"
21 #include "include/core/SkSize.h"
22 #include "include/core/SkString.h"
23 #include "include/core/SkSurface.h"
24 #include "include/core/SkTileMode.h"
25 #include "include/core/SkTypeface.h"
26 #include "include/core/SkTypes.h"
27 #include "include/effects/SkGradientShader.h"
28 #include "tools/ToolUtils.h"
29 #include "tools/fonts/FontToolUtils.h"
30
31 #define W SkIntToScalar(80)
32 #define H SkIntToScalar(60)
33
34 typedef void (*PaintProc)(SkPaint*);
35
identity_paintproc(SkPaint * paint)36 static void identity_paintproc(SkPaint* paint) {
37 paint->setShader(nullptr);
38 }
39
gradient_paintproc(SkPaint * paint)40 static void gradient_paintproc(SkPaint* paint) {
41 const SkColor colors[] = { SK_ColorGREEN, SK_ColorBLUE };
42 const SkPoint pts[] = { { 0, 0 }, { W, H } };
43 paint->setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, std::size(colors),
44 SkTileMode::kClamp));
45 }
46
47 typedef void (*Proc)(SkCanvas*, const SkPaint&, const SkFont&);
48
draw_hair(SkCanvas * canvas,const SkPaint & paint,const SkFont &)49 static void draw_hair(SkCanvas* canvas, const SkPaint& paint, const SkFont&) {
50 SkPaint p(paint);
51 p.setStrokeWidth(0);
52 canvas->drawLine(0, 0, W, H, p);
53 }
54
draw_thick(SkCanvas * canvas,const SkPaint & paint,const SkFont &)55 static void draw_thick(SkCanvas* canvas, const SkPaint& paint, const SkFont&) {
56 SkPaint p(paint);
57 p.setStrokeWidth(H/5);
58 canvas->drawLine(0, 0, W, H, p);
59 }
60
draw_rect(SkCanvas * canvas,const SkPaint & paint,const SkFont &)61 static void draw_rect(SkCanvas* canvas, const SkPaint& paint, const SkFont&) {
62 canvas->drawRect(SkRect::MakeWH(W, H), paint);
63 }
64
draw_oval(SkCanvas * canvas,const SkPaint & paint,const SkFont &)65 static void draw_oval(SkCanvas* canvas, const SkPaint& paint, const SkFont&) {
66 canvas->drawOval(SkRect::MakeWH(W, H), paint);
67 }
68
draw_text(SkCanvas * canvas,const SkPaint & paint,const SkFont & font)69 static void draw_text(SkCanvas* canvas, const SkPaint& paint, const SkFont& font) {
70 canvas->drawString("Hamburge", 0, H*2/3, font, paint);
71 }
72
73 class SrcModeGM : public skiagm::GM {
74 SkPath fPath;
75
onOnceBeforeDraw()76 void onOnceBeforeDraw() override { this->setBGColor(SK_ColorBLACK); }
77
getName() const78 SkString getName() const override { return SkString("srcmode"); }
79
getISize()80 SkISize getISize() override { return {640, 760}; }
81
drawContent(SkCanvas * canvas)82 void drawContent(SkCanvas* canvas) {
83 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
84
85 SkPaint paint;
86 SkFont font(ToolUtils::DefaultPortableTypeface(), H / 4);
87 paint.setColor(0x80F60000);
88
89 const Proc procs[] = {
90 draw_hair, draw_thick, draw_rect, draw_oval, draw_text
91 };
92
93 const SkBlendMode modes[] = {
94 SkBlendMode::kSrcOver, SkBlendMode::kSrc, SkBlendMode::kClear
95 };
96
97 const PaintProc paintProcs[] = {
98 identity_paintproc, gradient_paintproc
99 };
100
101 for (int aa = 0; aa <= 1; ++aa) {
102 paint.setAntiAlias(SkToBool(aa));
103 font.setEdging(SkToBool(aa) ? SkFont::Edging::kAntiAlias : SkFont::Edging::kAlias);
104 canvas->save();
105 for (size_t i = 0; i < std::size(paintProcs); ++i) {
106 paintProcs[i](&paint);
107 for (size_t x = 0; x < std::size(modes); ++x) {
108 paint.setBlendMode(modes[x]);
109 canvas->save();
110 for (size_t y = 0; y < std::size(procs); ++y) {
111 procs[y](canvas, paint, font);
112 canvas->translate(0, H * 5 / 4);
113 }
114 canvas->restore();
115 canvas->translate(W * 5 / 4, 0);
116 }
117 }
118 canvas->restore();
119 canvas->translate(0, (H * 5 / 4) * std::size(procs));
120 }
121 }
122
compat_surface(SkCanvas * canvas,const SkISize & size)123 static sk_sp<SkSurface> compat_surface(SkCanvas* canvas, const SkISize& size) {
124 SkImageInfo info = SkImageInfo::MakeN32Premul(size);
125 sk_sp<SkSurface> surface = canvas->makeSurface(info);
126 if (nullptr == surface) {
127 // picture canvas will return null, so fall-back to raster
128 surface = SkSurfaces::Raster(info);
129 }
130 return surface;
131 }
132
onDraw(SkCanvas * canvas)133 void onDraw(SkCanvas* canvas) override {
134 auto surf(compat_surface(canvas, this->getISize()));
135 surf->getCanvas()->drawColor(SK_ColorWHITE);
136 this->drawContent(surf->getCanvas());
137 surf->draw(canvas, 0, 0);
138 }
139 };
140
141 ///////////////////////////////////////////////////////////////////////////////
142
143 DEF_GM(return new SrcModeGM;)
144