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 "SkColorPriv.h"
11 #include "SkPath.h"
12 #include "SkShader.h"
13 
14 static void test4(SkCanvas* canvas) {
15     SkPaint paint;
16     paint.setAntiAlias(true);
17     SkPoint pts[] = {
18         {10, 160}, {610, 160},
19         {610, 160}, {10, 160},
20 
21         {610, 160}, {610, 160},
22         {610, 199}, {610, 199},
23 
24         {10, 198}, {610, 198},
25         {610, 199}, {10, 199},
26 
27         {10, 160}, {10, 160},
28         {10, 199}, {10, 199}
29     };
30     char verbs[] = {
31         0, 1, 1, 1, 4,
32         0, 1, 1, 1, 4,
33         0, 1, 1, 1, 4,
34         0, 1, 1, 1, 4
35     };
36     SkPath path;
37     SkPoint* ptPtr = pts;
38     for (size_t i = 0; i < sizeof(verbs); ++i) {
39         switch ((SkPath::Verb) verbs[i]) {
40             case SkPath::kMove_Verb:
41                 path.moveTo(ptPtr->fX, ptPtr->fY);
42                 ++ptPtr;
43                 break;
44             case SkPath::kLine_Verb:
45                 path.lineTo(ptPtr->fX, ptPtr->fY);
46                 ++ptPtr;
47                 break;
48             case SkPath::kClose_Verb:
49                 path.close();
50                 break;
51             default:
52                 SkASSERT(false);
53                 break;
54         }
55     }
56     SkRect clip = {0, 130, 772, 531};
57     canvas->clipRect(clip);
58     canvas->drawPath(path, paint);
59 }
60 
61 constexpr SkBlendMode gModes[] = {
62     SkBlendMode::kClear,
63     SkBlendMode::kSrc,
64     SkBlendMode::kDst,
65     SkBlendMode::kSrcOver,
66     SkBlendMode::kDstOver,
67     SkBlendMode::kSrcIn,
68     SkBlendMode::kDstIn,
69     SkBlendMode::kSrcOut,
70     SkBlendMode::kDstOut,
71     SkBlendMode::kSrcATop,
72     SkBlendMode::kDstATop,
73     SkBlendMode::kXor,
74 };
75 
76 const int gWidth = 64;
77 const int gHeight = 64;
78 const SkScalar W = SkIntToScalar(gWidth);
79 const SkScalar H = SkIntToScalar(gHeight);
80 
81 static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
82 
83     SkPaint paint;
84     paint.setAntiAlias(true);
85 
86     SkRect r = SkRect::MakeWH(W, H);
87     r.inset(W/10, H/10);
88 
89     paint.setColor(SK_ColorBLUE);
90     paint.setAlpha(a0);
91     canvas->drawOval(r, paint);
92 
93     paint.setColor(SK_ColorRED);
94     paint.setAlpha(a1);
95     paint.setBlendMode(mode);
96 
97     SkScalar offset = SK_Scalar1 / 3;
98     SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
99                                    H / 4 + offset,
100                                    W / 2, H / 2);
101     canvas->drawRect(rect, paint);
102 
103     return H;
104 }
105 
106 static sk_sp<SkShader> make_bg_shader() {
107     SkBitmap bm;
108     bm.allocN32Pixels(2, 2);
109     *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
110     *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE,
111                                                              0xCF, 0xCE);
112 
113     const SkMatrix m = SkMatrix::MakeScale(SkIntToScalar(6), SkIntToScalar(6));
114     return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
115                                       &m);
116 }
117 
118 namespace skiagm {
119 
120     class AARectModesGM : public GM {
121         SkPaint fBGPaint;
122     public:
123         AARectModesGM () {
124             fBGPaint.setShader(make_bg_shader());
125         }
126 
127     protected:
128 
129         SkString onShortName() override {
130             return SkString("aarectmodes");
131         }
132 
133         SkISize onISize() override { return SkISize::Make(640, 480); }
134 
135         void onDraw(SkCanvas* canvas) override {
136             if (false) { // avoid bit rot, suppress warning
137                 test4(canvas);
138             }
139             const SkRect bounds = SkRect::MakeWH(W, H);
140             constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
141 
142             canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
143 
144             for (int alpha = 0; alpha < 4; ++alpha) {
145                 canvas->save();
146                 canvas->save();
147                 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
148                     if (6 == i) {
149                         canvas->restore();
150                         canvas->translate(W * 5, 0);
151                         canvas->save();
152                     }
153                     canvas->drawRect(bounds, fBGPaint);
154                     canvas->saveLayer(&bounds, nullptr);
155                     SkScalar dy = drawCell(canvas, gModes[i],
156                                            gAlphaValue[alpha & 1],
157                                            gAlphaValue[alpha & 2]);
158                     canvas->restore();
159 
160                     canvas->translate(0, dy * 5 / 4);
161                 }
162                 canvas->restore();
163                 canvas->restore();
164                 canvas->translate(W * 5 / 4, 0);
165             }
166         }
167 
168     private:
169         typedef GM INHERITED;
170     };
171 
172 //////////////////////////////////////////////////////////////////////////////
173 
174     static GM* MyFactory(void*) { return new AARectModesGM; }
175     static GMRegistry reg(MyFactory);
176 
177 }
178