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(SK_ColorTRANSPARENT);
19
20    SkPaint p;
21    p.setAntiAlias(true);
22
23    SkRect r;
24    SkScalar ww = SkIntToScalar(w);
25    SkScalar hh = SkIntToScalar(h);
26
27    {
28        SkCanvas c(*src);
29        p.setColor(0xFFFFCC44);
30        r.set(0, 0, ww*3/4, hh*3/4);
31        c.drawOval(r, p);
32    }
33
34    dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
35    dst->allocPixels();
36    dst->eraseColor(SK_ColorTRANSPARENT);
37
38    {
39        SkCanvas c(*dst);
40        p.setColor(0xFF66AAFF);
41        r.set(ww/3, hh/3, ww*19/20, hh*19/20);
42        c.drawRect(r, p);
43    }
44}
45
46static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
47
48class XfermodesGM : public GM {
49    enum SrcType {
50     //! A WxH image with a rectangle in the lower right.
51     kRectangleImage_SrcType               = 0x01,
52     //! kRectangleImage_SrcType with an alpha of 34.5%.
53     kRectangleImageWithAlpha_SrcType      = 0x02,
54     //! kRectnagleImageWithAlpha_SrcType scaled down by half.
55     kSmallRectangleImageWithAlpha_SrcType = 0x04,
56     //! kRectangleImage_SrcType drawn directly instead in an image.
57     kRectangle_SrcType                    = 0x08,
58     //! Two rectangles, first on the right half, second on the bottom half.
59     kQuarterClear_SrcType                 = 0x10,
60     //! kQuarterClear_SrcType in a layer.
61     kQuarterClearInLayer_SrcType          = 0x20,
62
63     kAll_SrcType                          = 0x3F, //!< All the source types.
64     kBasic_SrcType                        = 0x03, //!< Just basic source types.
65    };
66
67    SkBitmap    fBG;
68    SkBitmap    fSrcB, fDstB;
69
70    /* The srcType argument indicates what to draw for the source part. Skia
71     * uses the implied shape of the drawing command and these modes
72     * demonstrate that.
73     */
74    void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType,
75                   SkScalar x, SkScalar y) {
76        SkPaint p;
77        SkMatrix m;
78        bool restoreNeeded = false;
79        m.setTranslate(x, y);
80
81        canvas->drawBitmapMatrix(fSrcB, m, &p);
82        p.setXfermode(mode);
83        switch (srcType) {
84            case kQuarterClearInLayer_SrcType: {
85                SkRect bounds = SkRect::MakeXYWH(x, y, W, H);
86                canvas->saveLayer(&bounds, &p);
87                restoreNeeded = true;
88                p.setXfermodeMode(SkXfermode::kSrcOver_Mode);
89                // Fall through.
90            }
91            case kQuarterClear_SrcType: {
92                SkScalar halfW = SkIntToScalar(W) / 2;
93                SkScalar halfH = SkIntToScalar(H) / 2;
94                p.setColor(0xFF66AAFF);
95                SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW, H);
96                canvas->drawRect(r, p);
97                p.setColor(0xFFAA66FF);
98                r = SkRect::MakeXYWH(x, y + halfH, W, halfH);
99                canvas->drawRect(r, p);
100                break;
101            }
102            case kRectangle_SrcType: {
103                SkScalar w = SkIntToScalar(W);
104                SkScalar h = SkIntToScalar(H);
105                SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
106                                            w * 37 / 60, h * 37 / 60);
107                p.setColor(0xFF66AAFF);
108                canvas->drawRect(r, p);
109                break;
110            }
111            case kSmallRectangleImageWithAlpha_SrcType:
112                m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
113                // Fall through.
114            case kRectangleImageWithAlpha_SrcType:
115                p.setAlpha(0x88);
116                // Fall through.
117            case kRectangleImage_SrcType:
118                canvas->drawBitmapMatrix(fDstB, m, &p);
119                break;
120            default:
121                break;
122        }
123
124        if (restoreNeeded) {
125            canvas->restore();
126        }
127    }
128
129    virtual void onOnceBeforeDraw() SK_OVERRIDE {
130        fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
131        fBG.setPixels(gData);
132        fBG.setIsOpaque(true);
133
134        make_bitmaps(W, H, &fSrcB, &fDstB);
135    }
136
137public:
138    const static int W = 64;
139    const static int H = 64;
140    XfermodesGM() {}
141
142protected:
143    virtual SkString onShortName() {
144        return SkString("xfermodes");
145    }
146
147    virtual SkISize onISize() {
148        return make_isize(1590, 640);
149    }
150
151    virtual void onDraw(SkCanvas* canvas) {
152        canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
153
154        const struct {
155            SkXfermode::Mode  fMode;
156            const char*       fLabel;
157            int               fSourceTypeMask;  // The source types to use this
158                                                // mode with. See draw_mode for
159                                                // an explanation of each type.
160                                                // PDF has to play some tricks
161                                                // to support the base modes,
162                                                // test those more extensively.
163        } gModes[] = {
164            { SkXfermode::kClear_Mode,        "Clear",        kAll_SrcType   },
165            { SkXfermode::kSrc_Mode,          "Src",          kAll_SrcType   },
166            { SkXfermode::kDst_Mode,          "Dst",          kAll_SrcType   },
167            { SkXfermode::kSrcOver_Mode,      "SrcOver",      kAll_SrcType   },
168            { SkXfermode::kDstOver_Mode,      "DstOver",      kAll_SrcType   },
169            { SkXfermode::kSrcIn_Mode,        "SrcIn",        kAll_SrcType   },
170            { SkXfermode::kDstIn_Mode,        "DstIn",        kAll_SrcType   },
171            { SkXfermode::kSrcOut_Mode,       "SrcOut",       kAll_SrcType   },
172            { SkXfermode::kDstOut_Mode,       "DstOut",       kAll_SrcType   },
173            { SkXfermode::kSrcATop_Mode,      "SrcATop",      kAll_SrcType   },
174            { SkXfermode::kDstATop_Mode,      "DstATop",      kAll_SrcType   },
175
176            { SkXfermode::kXor_Mode,          "Xor",          kBasic_SrcType },
177            { SkXfermode::kPlus_Mode,         "Plus",         kBasic_SrcType },
178            { SkXfermode::kModulate_Mode,     "Modulate",     kAll_SrcType   },
179            { SkXfermode::kScreen_Mode,       "Screen",       kBasic_SrcType },
180            { SkXfermode::kOverlay_Mode,      "Overlay",      kBasic_SrcType },
181            { SkXfermode::kDarken_Mode,       "Darken",       kBasic_SrcType },
182            { SkXfermode::kLighten_Mode,      "Lighten",      kBasic_SrcType },
183            { SkXfermode::kColorDodge_Mode,   "ColorDodge",   kBasic_SrcType },
184            { SkXfermode::kColorBurn_Mode,    "ColorBurn",    kBasic_SrcType },
185            { SkXfermode::kHardLight_Mode,    "HardLight",    kBasic_SrcType },
186            { SkXfermode::kSoftLight_Mode,    "SoftLight",    kBasic_SrcType },
187            { SkXfermode::kDifference_Mode,   "Difference",   kBasic_SrcType },
188            { SkXfermode::kExclusion_Mode,    "Exclusion",    kBasic_SrcType },
189            { SkXfermode::kMultiply_Mode,     "Multiply",     kAll_SrcType   },
190            { SkXfermode::kHue_Mode,          "Hue",          kBasic_SrcType },
191            { SkXfermode::kSaturation_Mode,   "Saturation",   kBasic_SrcType },
192            { SkXfermode::kColor_Mode,        "Color",        kBasic_SrcType },
193            { SkXfermode::kLuminosity_Mode,   "Luminosity",   kBasic_SrcType },
194        };
195
196        const SkScalar w = SkIntToScalar(W);
197        const SkScalar h = SkIntToScalar(H);
198        SkShader* s = SkShader::CreateBitmapShader(fBG,
199                                                   SkShader::kRepeat_TileMode,
200                                                   SkShader::kRepeat_TileMode);
201        SkMatrix m;
202        m.setScale(SkIntToScalar(6), SkIntToScalar(6));
203        s->setLocalMatrix(m);
204
205        SkPaint labelP;
206        labelP.setAntiAlias(true);
207        labelP.setTextAlign(SkPaint::kCenter_Align);
208
209        const int W = 5;
210
211        SkScalar x0 = 0;
212        SkScalar y0 = 0;
213        for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) {
214            SkScalar x = x0, y = y0;
215            for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
216                if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
217                    continue;
218                }
219                SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
220                SkAutoUnref aur(mode);
221                SkRect r;
222                r.set(x, y, x+w, y+h);
223
224                SkPaint p;
225                p.setStyle(SkPaint::kFill_Style);
226                p.setShader(s);
227                canvas->drawRect(r, p);
228
229                canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
230                draw_mode(canvas, mode, static_cast<SrcType>(sourceType),
231                          r.fLeft, r.fTop);
232                canvas->restore();
233
234                r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
235                p.setStyle(SkPaint::kStroke_Style);
236                p.setShader(NULL);
237                canvas->drawRect(r, p);
238
239#if 1
240                canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
241                                 x + w/2, y - labelP.getTextSize()/2, labelP);
242#endif
243                x += w + SkIntToScalar(10);
244                if ((i % W) == W - 1) {
245                    x = x0;
246                    y += h + SkIntToScalar(30);
247                }
248            }
249            if (y < 320) {
250                if (x > x0) {
251                    y += h + SkIntToScalar(30);
252                }
253                y0 = y;
254            } else {
255                x0 += SkIntToScalar(400);
256                y0 = 0;
257            }
258        }
259        s->unref();
260    }
261
262private:
263    typedef GM INHERITED;
264};
265
266//////////////////////////////////////////////////////////////////////////////
267
268static GM* MyFactory(void*) { return new XfermodesGM; }
269static GMRegistry reg(MyFactory);
270
271}
272