1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "gm.h"
9 #include "SkBitmap.h"
10 #include "SkShader.h"
11 #include "SkXfermode.h"
12
13 namespace skiagm {
14
make_bitmaps(int w,int h,SkBitmap * src,SkBitmap * dst)15 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
16 src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
17 src->allocPixels();
18 src->eraseColor(0);
19
20 SkCanvas c(*src);
21 SkPaint p;
22 SkRect r;
23 SkScalar ww = SkIntToScalar(w);
24 SkScalar hh = SkIntToScalar(h);
25
26 p.setAntiAlias(true);
27 p.setColor(0xFFFFCC44);
28 r.set(0, 0, ww*3/4, hh*3/4);
29 c.drawOval(r, p);
30
31 dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
32 dst->allocPixels();
33 dst->eraseColor(0);
34 c.setBitmapDevice(*dst);
35
36 p.setColor(0xFF66AAFF);
37 r.set(ww/3, hh/3, ww*19/20, hh*19/20);
38 c.drawRect(r, p);
39 }
40
41 class XfermodesGM : public GM {
42 SkBitmap fBG;
43 SkBitmap fSrcB, fDstB;
44 bool fOnce;
45
draw_mode(SkCanvas * canvas,SkXfermode * mode,int alpha,SkScalar x,SkScalar y)46 void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
47 SkScalar x, SkScalar y) {
48 SkPaint p;
49
50 canvas->drawBitmap(fSrcB, x, y, &p);
51 p.setAlpha(alpha);
52 p.setXfermode(mode);
53 canvas->drawBitmap(fDstB, x, y, &p);
54 }
55
init()56 void init() {
57 if (!fOnce) {
58 // Do all this work in a temporary so we get a deep copy
59 uint16_t localData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
60 SkBitmap scratchBitmap;
61 scratchBitmap.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
62 scratchBitmap.setPixels(localData);
63 scratchBitmap.setIsOpaque(true);
64 scratchBitmap.copyTo(&fBG, SkBitmap::kARGB_4444_Config);
65
66 make_bitmaps(W, H, &fSrcB, &fDstB);
67 fOnce = true;
68 }
69 }
70
71 public:
72 const static int W = 64;
73 const static int H = 64;
XfermodesGM()74 XfermodesGM() : fOnce(false) {}
75
76 protected:
onShortName()77 virtual SkString onShortName() {
78 return SkString("xfermodes");
79 }
80
onISize()81 virtual SkISize onISize() {
82 return make_isize(790, 640);
83 }
84
onDraw(SkCanvas * canvas)85 virtual void onDraw(SkCanvas* canvas) {
86 this->init();
87
88 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
89
90 const struct {
91 SkXfermode::Mode fMode;
92 const char* fLabel;
93 } gModes[] = {
94 { SkXfermode::kClear_Mode, "Clear" },
95 { SkXfermode::kSrc_Mode, "Src" },
96 { SkXfermode::kDst_Mode, "Dst" },
97 { SkXfermode::kSrcOver_Mode, "SrcOver" },
98 { SkXfermode::kDstOver_Mode, "DstOver" },
99 { SkXfermode::kSrcIn_Mode, "SrcIn" },
100 { SkXfermode::kDstIn_Mode, "DstIn" },
101 { SkXfermode::kSrcOut_Mode, "SrcOut" },
102 { SkXfermode::kDstOut_Mode, "DstOut" },
103 { SkXfermode::kSrcATop_Mode, "SrcATop" },
104 { SkXfermode::kDstATop_Mode, "DstATop" },
105 { SkXfermode::kXor_Mode, "Xor" },
106
107 { SkXfermode::kPlus_Mode, "Plus" },
108 { SkXfermode::kMultiply_Mode, "Multiply" },
109 { SkXfermode::kScreen_Mode, "Screen" },
110 { SkXfermode::kOverlay_Mode, "Overlay" },
111 { SkXfermode::kDarken_Mode, "Darken" },
112 { SkXfermode::kLighten_Mode, "Lighten" },
113 { SkXfermode::kColorDodge_Mode, "ColorDodge" },
114 { SkXfermode::kColorBurn_Mode, "ColorBurn" },
115 { SkXfermode::kHardLight_Mode, "HardLight" },
116 { SkXfermode::kSoftLight_Mode, "SoftLight" },
117 { SkXfermode::kDifference_Mode, "Difference" },
118 { SkXfermode::kExclusion_Mode, "Exclusion" },
119 };
120
121 const SkScalar w = SkIntToScalar(W);
122 const SkScalar h = SkIntToScalar(H);
123 SkShader* s = SkShader::CreateBitmapShader(fBG,
124 SkShader::kRepeat_TileMode,
125 SkShader::kRepeat_TileMode);
126 SkMatrix m;
127 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
128 s->setLocalMatrix(m);
129
130 SkPaint labelP;
131 labelP.setAntiAlias(true);
132 labelP.setTextAlign(SkPaint::kCenter_Align);
133
134 const int W = 5;
135
136 SkScalar x0 = 0;
137 for (int twice = 0; twice < 2; twice++) {
138 SkScalar x = x0, y = 0;
139 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
140 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
141 SkAutoUnref aur(mode);
142 SkRect r;
143 r.set(x, y, x+w, y+h);
144
145 SkPaint p;
146 p.setStyle(SkPaint::kFill_Style);
147 p.setShader(s);
148 canvas->drawRect(r, p);
149
150 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
151 draw_mode(canvas, mode, twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
152 canvas->restore();
153
154 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
155 p.setStyle(SkPaint::kStroke_Style);
156 p.setShader(NULL);
157 canvas->drawRect(r, p);
158
159 #if 1
160 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
161 x + w/2, y - labelP.getTextSize()/2, labelP);
162 #endif
163 x += w + SkIntToScalar(10);
164 if ((i % W) == W - 1) {
165 x = x0;
166 y += h + SkIntToScalar(30);
167 }
168 }
169 x0 += SkIntToScalar(400);
170 }
171 s->unref();
172 }
173
174 private:
175 typedef GM INHERITED;
176 };
177
178 //////////////////////////////////////////////////////////////////////////////
179
MyFactory(void *)180 static GM* MyFactory(void*) { return new XfermodesGM; }
181 static GMRegistry reg(MyFactory);
182
183 }
184