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                         SkBitmap* transparent) {
17    src->allocN32Pixels(w, h);
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->allocN32Pixels(w, h);
35    dst->eraseColor(SK_ColorTRANSPARENT);
36
37    {
38        SkCanvas c(*dst);
39        p.setColor(0xFF66AAFF);
40        r.set(ww/3, hh/3, ww*19/20, hh*19/20);
41        c.drawRect(r, p);
42    }
43
44    transparent->allocN32Pixels(w, h);
45    transparent->eraseColor(SK_ColorTRANSPARENT);
46}
47
48static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
49
50class XfermodesGM : public GM {
51    enum SrcType {
52     //! A WxH image with a rectangle in the lower right.
53     kRectangleImage_SrcType               = 0x01,
54     //! kRectangleImage_SrcType with an alpha of 34.5%.
55     kRectangleImageWithAlpha_SrcType      = 0x02,
56     //! kRectnagleImageWithAlpha_SrcType scaled down by half.
57     kSmallRectangleImageWithAlpha_SrcType = 0x04,
58     //! kRectangleImage_SrcType drawn directly instead in an image.
59     kRectangle_SrcType                    = 0x08,
60     //! Two rectangles, first on the right half, second on the bottom half.
61     kQuarterClear_SrcType                 = 0x10,
62     //! kQuarterClear_SrcType in a layer.
63     kQuarterClearInLayer_SrcType          = 0x20,
64     //! A W/2xH/2 transparent image.
65     kSmallTransparentImage_SrcType        = 0x40,
66     //! kRectangleImage_SrcType drawn directly with a mask.
67     kRectangleWithMask_SrcType            = 0x80,
68
69     kAll_SrcType                          = 0xFF, //!< All the source types.
70     kBasic_SrcType                        = 0x03, //!< Just basic source types.
71    };
72
73    SkBitmap    fBG;
74    SkBitmap    fSrcB, fDstB, fTransparent;
75
76    /* The srcType argument indicates what to draw for the source part. Skia
77     * uses the implied shape of the drawing command and these modes
78     * demonstrate that.
79     */
80    void draw_mode(SkCanvas* canvas, SkXfermode* mode, SrcType srcType,
81                   SkScalar x, SkScalar y) {
82        SkPaint p;
83        SkMatrix m;
84        bool restoreNeeded = false;
85        m.setTranslate(x, y);
86
87        canvas->drawBitmapMatrix(fSrcB, m, &p);
88        p.setXfermode(mode);
89        switch (srcType) {
90            case kSmallTransparentImage_SrcType:
91                m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
92                canvas->drawBitmapMatrix(fTransparent, m, &p);
93                break;
94            case kQuarterClearInLayer_SrcType: {
95                SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W),
96                                                 SkIntToScalar(H));
97                canvas->saveLayer(&bounds, &p);
98                restoreNeeded = true;
99                p.setXfermodeMode(SkXfermode::kSrcOver_Mode);
100                // Fall through.
101            }
102            case kQuarterClear_SrcType: {
103                SkScalar halfW = SkIntToScalar(W) / 2;
104                SkScalar halfH = SkIntToScalar(H) / 2;
105                p.setColor(0xFF66AAFF);
106                SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW,
107                                            SkIntToScalar(H));
108                canvas->drawRect(r, p);
109                p.setColor(0xFFAA66FF);
110                r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH);
111                canvas->drawRect(r, p);
112                break;
113            }
114            case kRectangleWithMask_SrcType: {
115                canvas->save();
116                restoreNeeded = true;
117                SkScalar w = SkIntToScalar(W);
118                SkScalar h = SkIntToScalar(H);
119                SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60);
120                canvas->clipRect(r);
121                // Fall through.
122            }
123            case kRectangle_SrcType: {
124                SkScalar w = SkIntToScalar(W);
125                SkScalar h = SkIntToScalar(H);
126                SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
127                                            w * 37 / 60, h * 37 / 60);
128                p.setColor(0xFF66AAFF);
129                canvas->drawRect(r, p);
130                break;
131            }
132            case kSmallRectangleImageWithAlpha_SrcType:
133                m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
134                // Fall through.
135            case kRectangleImageWithAlpha_SrcType:
136                p.setAlpha(0x88);
137                // Fall through.
138            case kRectangleImage_SrcType:
139                canvas->drawBitmapMatrix(fDstB, m, &p);
140                break;
141            default:
142                break;
143        }
144
145        if (restoreNeeded) {
146            canvas->restore();
147        }
148    }
149
150    virtual void onOnceBeforeDraw() SK_OVERRIDE {
151        fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
152                                            kOpaque_SkAlphaType),
153                          gData, 4);
154
155        make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent);
156    }
157
158public:
159    const static int W = 64;
160    const static int H = 64;
161    XfermodesGM() {}
162
163protected:
164    virtual SkString onShortName() {
165        return SkString("xfermodes");
166    }
167
168    virtual SkISize onISize() {
169        return SkISize::Make(1990, 640);
170    }
171
172    virtual void onDraw(SkCanvas* canvas) {
173        canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
174
175        const struct {
176            SkXfermode::Mode  fMode;
177            const char*       fLabel;
178            int               fSourceTypeMask;  // The source types to use this
179                                                // mode with. See draw_mode for
180                                                // an explanation of each type.
181                                                // PDF has to play some tricks
182                                                // to support the base modes,
183                                                // test those more extensively.
184        } gModes[] = {
185            { SkXfermode::kClear_Mode,        "Clear",        kAll_SrcType   },
186            { SkXfermode::kSrc_Mode,          "Src",          kAll_SrcType   },
187            { SkXfermode::kDst_Mode,          "Dst",          kAll_SrcType   },
188            { SkXfermode::kSrcOver_Mode,      "SrcOver",      kAll_SrcType   },
189            { SkXfermode::kDstOver_Mode,      "DstOver",      kAll_SrcType   },
190            { SkXfermode::kSrcIn_Mode,        "SrcIn",        kAll_SrcType   },
191            { SkXfermode::kDstIn_Mode,        "DstIn",        kAll_SrcType   },
192            { SkXfermode::kSrcOut_Mode,       "SrcOut",       kAll_SrcType   },
193            { SkXfermode::kDstOut_Mode,       "DstOut",       kAll_SrcType   },
194            { SkXfermode::kSrcATop_Mode,      "SrcATop",      kAll_SrcType   },
195            { SkXfermode::kDstATop_Mode,      "DstATop",      kAll_SrcType   },
196
197            { SkXfermode::kXor_Mode,          "Xor",          kBasic_SrcType },
198            { SkXfermode::kPlus_Mode,         "Plus",         kBasic_SrcType },
199            { SkXfermode::kModulate_Mode,     "Modulate",     kAll_SrcType   },
200            { SkXfermode::kScreen_Mode,       "Screen",       kBasic_SrcType },
201            { SkXfermode::kOverlay_Mode,      "Overlay",      kBasic_SrcType },
202            { SkXfermode::kDarken_Mode,       "Darken",       kBasic_SrcType },
203            { SkXfermode::kLighten_Mode,      "Lighten",      kBasic_SrcType },
204            { SkXfermode::kColorDodge_Mode,   "ColorDodge",   kBasic_SrcType },
205            { SkXfermode::kColorBurn_Mode,    "ColorBurn",    kBasic_SrcType },
206            { SkXfermode::kHardLight_Mode,    "HardLight",    kBasic_SrcType },
207            { SkXfermode::kSoftLight_Mode,    "SoftLight",    kBasic_SrcType },
208            { SkXfermode::kDifference_Mode,   "Difference",   kBasic_SrcType },
209            { SkXfermode::kExclusion_Mode,    "Exclusion",    kBasic_SrcType },
210            { SkXfermode::kMultiply_Mode,     "Multiply",     kAll_SrcType   },
211            { SkXfermode::kHue_Mode,          "Hue",          kBasic_SrcType },
212            { SkXfermode::kSaturation_Mode,   "Saturation",   kBasic_SrcType },
213            { SkXfermode::kColor_Mode,        "Color",        kBasic_SrcType },
214            { SkXfermode::kLuminosity_Mode,   "Luminosity",   kBasic_SrcType },
215        };
216
217        const SkScalar w = SkIntToScalar(W);
218        const SkScalar h = SkIntToScalar(H);
219        SkMatrix m;
220        m.setScale(SkIntToScalar(6), SkIntToScalar(6));
221        SkShader* s = SkShader::CreateBitmapShader(fBG,
222                                                   SkShader::kRepeat_TileMode,
223                                                   SkShader::kRepeat_TileMode,
224                                                   &m);
225
226        SkPaint labelP;
227        labelP.setAntiAlias(true);
228        sk_tool_utils::set_portable_typeface(&labelP);
229        labelP.setTextAlign(SkPaint::kCenter_Align);
230
231        const int W = 5;
232
233        SkScalar x0 = 0;
234        SkScalar y0 = 0;
235        for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) {
236            SkScalar x = x0, y = y0;
237            for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
238                if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
239                    continue;
240                }
241                SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
242                SkAutoUnref aur(mode);
243                SkRect r;
244                r.set(x, y, x+w, y+h);
245
246                SkPaint p;
247                p.setStyle(SkPaint::kFill_Style);
248                p.setShader(s);
249                canvas->drawRect(r, p);
250
251                canvas->saveLayer(&r, NULL);
252                draw_mode(canvas, mode, static_cast<SrcType>(sourceType),
253                          r.fLeft, r.fTop);
254                canvas->restore();
255
256                r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
257                p.setStyle(SkPaint::kStroke_Style);
258                p.setShader(NULL);
259                canvas->drawRect(r, p);
260
261#if 1
262                canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
263                                 x + w/2, y - labelP.getTextSize()/2, labelP);
264#endif
265                x += w + SkIntToScalar(10);
266                if ((i % W) == W - 1) {
267                    x = x0;
268                    y += h + SkIntToScalar(30);
269                }
270            }
271            if (y < 320) {
272                if (x > x0) {
273                    y += h + SkIntToScalar(30);
274                }
275                y0 = y;
276            } else {
277                x0 += SkIntToScalar(400);
278                y0 = 0;
279            }
280        }
281        s->unref();
282    }
283
284private:
285    typedef GM INHERITED;
286};
287
288//////////////////////////////////////////////////////////////////////////////
289
290static GM* MyFactory(void*) { return new XfermodesGM; }
291static GMRegistry reg(MyFactory);
292
293}
294