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
13namespace skiagm {
14
15static 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
41class XfermodesGM : public GM {
42    SkBitmap    fBG;
43    SkBitmap    fSrcB, fDstB;
44    bool        fOnce;
45
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
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
71public:
72    const static int W = 64;
73    const static int H = 64;
74    XfermodesGM() : fOnce(false) {}
75
76protected:
77    virtual SkString onShortName() {
78        return SkString("xfermodes");
79    }
80
81    virtual SkISize onISize() {
82        return make_isize(790, 640);
83    }
84
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
174private:
175    typedef GM INHERITED;
176};
177
178//////////////////////////////////////////////////////////////////////////////
179
180static GM* MyFactory(void*) { return new XfermodesGM; }
181static GMRegistry reg(MyFactory);
182
183}
184