1 /*
2 * Copyright 2013 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 #include "gm.h"
8 #include "sk_tool_utils.h"
9 #include "SkBitmap.h"
10 #include "SkShader.h"
11 #include "SkBlendModePriv.h"
12 #include "SkColorPriv.h"
13
14 namespace skiagm {
15
16 class Xfermodes2GM : public GM {
17 public:
Xfermodes2GM()18 Xfermodes2GM() {}
19
20 protected:
onShortName()21 SkString onShortName() override {
22 return SkString("xfermodes2");
23 }
24
onISize()25 SkISize onISize() override {
26 return SkISize::Make(455, 475);
27 }
28
onDraw(SkCanvas * canvas)29 void onDraw(SkCanvas* canvas) override {
30 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
31
32 const SkScalar w = SkIntToScalar(kSize);
33 const SkScalar h = SkIntToScalar(kSize);
34
35 SkPaint labelP;
36 labelP.setAntiAlias(true);
37 sk_tool_utils::set_portable_typeface(&labelP);
38 labelP.setTextAlign(SkPaint::kCenter_Align);
39
40 const int W = 6;
41
42 SkScalar x = 0, y = 0;
43 for (size_t m = 0; m <= (size_t)SkBlendMode::kLastMode; m++) {
44 SkBlendMode mode = static_cast<SkBlendMode>(m);
45
46 canvas->save();
47
48 canvas->translate(x, y);
49 SkPaint p;
50 p.setAntiAlias(false);
51 p.setStyle(SkPaint::kFill_Style);
52 p.setShader(fBG);
53 SkRect r = SkRect::MakeWH(w, h);
54 canvas->drawRect(r, p);
55
56 canvas->saveLayer(&r, nullptr);
57
58 p.setShader(fDst);
59 canvas->drawRect(r, p);
60 p.setShader(fSrc);
61 p.setBlendMode(mode);
62 canvas->drawRect(r, p);
63
64 canvas->restore();
65
66 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
67 p.setStyle(SkPaint::kStroke_Style);
68 p.setShader(nullptr);
69 p.setBlendMode(SkBlendMode::kSrcOver);
70 canvas->drawRect(r, p);
71
72 canvas->restore();
73
74 #if 1
75 canvas->drawString(SkBlendMode_Name(mode),
76 x + w/2, y - labelP.getTextSize()/2, labelP);
77 #endif
78 x += w + SkIntToScalar(10);
79 if ((m % W) == W - 1) {
80 x = 0;
81 y += h + SkIntToScalar(30);
82 }
83 }
84 }
85
86 private:
onOnceBeforeDraw()87 void onOnceBeforeDraw() override {
88 const uint32_t kCheckData[] = {
89 SkPackARGB32(0xFF, 0x42, 0x41, 0x42),
90 SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
91 SkPackARGB32(0xFF, 0xD6, 0xD3, 0xD6),
92 SkPackARGB32(0xFF, 0x42, 0x41, 0x42)
93 };
94 SkBitmap bg;
95 bg.allocN32Pixels(2, 2, true);
96 memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
97
98 SkMatrix lm;
99 lm.setScale(SkIntToScalar(16), SkIntToScalar(16));
100 fBG = SkShader::MakeBitmapShader(bg, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
101 &lm);
102
103 SkBitmap srcBmp;
104 srcBmp.allocN32Pixels(kSize, kSize);
105 SkPMColor* pixels = reinterpret_cast<SkPMColor*>(srcBmp.getPixels());
106
107 for (int y = 0; y < kSize; ++y) {
108 int c = y * (1 << kShift);
109 SkPMColor rowColor = SkPackARGB32(c, c, 0, c/2);
110 for (int x = 0; x < kSize; ++x) {
111 pixels[kSize * y + x] = rowColor;
112 }
113 }
114 fSrc = SkShader::MakeBitmapShader(srcBmp, SkShader::kClamp_TileMode,
115 SkShader::kClamp_TileMode);
116 SkBitmap dstBmp;
117 dstBmp.allocN32Pixels(kSize, kSize);
118 pixels = reinterpret_cast<SkPMColor*>(dstBmp.getPixels());
119
120 for (int x = 0; x < kSize; ++x) {
121 int c = x * (1 << kShift);
122 SkPMColor colColor = SkPackARGB32(c, 0, c, c/2);
123 for (int y = 0; y < kSize; ++y) {
124 pixels[kSize * y + x] = colColor;
125 }
126 }
127 fDst = SkShader::MakeBitmapShader(dstBmp, SkShader::kClamp_TileMode,
128 SkShader::kClamp_TileMode);
129 }
130
131 enum {
132 kShift = 2,
133 kSize = 256 >> kShift,
134 };
135
136 sk_sp<SkShader> fBG;
137 sk_sp<SkShader> fSrc;
138 sk_sp<SkShader> fDst;
139
140 typedef GM INHERITED;
141 };
142
143 //////////////////////////////////////////////////////////////////////////////
144
MyFactory(void *)145 static GM* MyFactory(void*) { return new Xfermodes2GM; }
146 static GMRegistry reg(MyFactory);
147
148 }
149