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,SkBitmap * transparent)15 static 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
48 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
49
50 class 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 */
draw_mode(SkCanvas * canvas,SkXfermode * mode,SrcType srcType,SkScalar x,SkScalar y)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->drawBitmap(fSrcB, x, y, &p);
88 p.setXfermode(mode);
89 switch (srcType) {
90 case kSmallTransparentImage_SrcType: {
91 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
92
93 SkAutoCanvasRestore acr(canvas, true);
94 canvas->concat(m);
95 canvas->drawBitmap(fTransparent, 0, 0, &p);
96 break;
97 }
98 case kQuarterClearInLayer_SrcType: {
99 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W),
100 SkIntToScalar(H));
101 canvas->saveLayer(&bounds, &p);
102 restoreNeeded = true;
103 p.setXfermodeMode(SkXfermode::kSrcOver_Mode);
104 // Fall through.
105 }
106 case kQuarterClear_SrcType: {
107 SkScalar halfW = SkIntToScalar(W) / 2;
108 SkScalar halfH = SkIntToScalar(H) / 2;
109 p.setColor(0xFF66AAFF);
110 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW,
111 SkIntToScalar(H));
112 canvas->drawRect(r, p);
113 p.setColor(0xFFAA66FF);
114 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH);
115 canvas->drawRect(r, p);
116 break;
117 }
118 case kRectangleWithMask_SrcType: {
119 canvas->save();
120 restoreNeeded = true;
121 SkScalar w = SkIntToScalar(W);
122 SkScalar h = SkIntToScalar(H);
123 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60);
124 canvas->clipRect(r);
125 // Fall through.
126 }
127 case kRectangle_SrcType: {
128 SkScalar w = SkIntToScalar(W);
129 SkScalar h = SkIntToScalar(H);
130 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
131 w * 37 / 60, h * 37 / 60);
132 p.setColor(0xFF66AAFF);
133 canvas->drawRect(r, p);
134 break;
135 }
136 case kSmallRectangleImageWithAlpha_SrcType:
137 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
138 // Fall through.
139 case kRectangleImageWithAlpha_SrcType:
140 p.setAlpha(0x88);
141 // Fall through.
142 case kRectangleImage_SrcType: {
143 SkAutoCanvasRestore acr(canvas, true);
144 canvas->concat(m);
145 canvas->drawBitmap(fDstB, 0, 0, &p);
146 break;
147 }
148 default:
149 break;
150 }
151
152 if (restoreNeeded) {
153 canvas->restore();
154 }
155 }
156
onOnceBeforeDraw()157 void onOnceBeforeDraw() override {
158 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
159 kOpaque_SkAlphaType),
160 gData, 4);
161
162 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent);
163 }
164
165 public:
166 const static int W = 64;
167 const static int H = 64;
XfermodesGM()168 XfermodesGM() {}
169
170 protected:
onShortName()171 SkString onShortName() override {
172 return SkString("xfermodes");
173 }
174
onISize()175 SkISize onISize() override {
176 return SkISize::Make(1990, 640);
177 }
178
onDraw(SkCanvas * canvas)179 void onDraw(SkCanvas* canvas) override {
180 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
181
182 const struct {
183 SkXfermode::Mode fMode;
184 const char* fLabel;
185 int fSourceTypeMask; // The source types to use this
186 // mode with. See draw_mode for
187 // an explanation of each type.
188 // PDF has to play some tricks
189 // to support the base modes,
190 // test those more extensively.
191 } gModes[] = {
192 { SkXfermode::kClear_Mode, "Clear", kAll_SrcType },
193 { SkXfermode::kSrc_Mode, "Src", kAll_SrcType },
194 { SkXfermode::kDst_Mode, "Dst", kAll_SrcType },
195 { SkXfermode::kSrcOver_Mode, "SrcOver", kAll_SrcType },
196 { SkXfermode::kDstOver_Mode, "DstOver", kAll_SrcType },
197 { SkXfermode::kSrcIn_Mode, "SrcIn", kAll_SrcType },
198 { SkXfermode::kDstIn_Mode, "DstIn", kAll_SrcType },
199 { SkXfermode::kSrcOut_Mode, "SrcOut", kAll_SrcType },
200 { SkXfermode::kDstOut_Mode, "DstOut", kAll_SrcType },
201 { SkXfermode::kSrcATop_Mode, "SrcATop", kAll_SrcType },
202 { SkXfermode::kDstATop_Mode, "DstATop", kAll_SrcType },
203
204 { SkXfermode::kXor_Mode, "Xor", kBasic_SrcType },
205 { SkXfermode::kPlus_Mode, "Plus", kBasic_SrcType },
206 { SkXfermode::kModulate_Mode, "Modulate", kAll_SrcType },
207 { SkXfermode::kScreen_Mode, "Screen", kBasic_SrcType },
208 { SkXfermode::kOverlay_Mode, "Overlay", kBasic_SrcType },
209 { SkXfermode::kDarken_Mode, "Darken", kBasic_SrcType },
210 { SkXfermode::kLighten_Mode, "Lighten", kBasic_SrcType },
211 { SkXfermode::kColorDodge_Mode, "ColorDodge", kBasic_SrcType },
212 { SkXfermode::kColorBurn_Mode, "ColorBurn", kBasic_SrcType },
213 { SkXfermode::kHardLight_Mode, "HardLight", kBasic_SrcType },
214 { SkXfermode::kSoftLight_Mode, "SoftLight", kBasic_SrcType },
215 { SkXfermode::kDifference_Mode, "Difference", kBasic_SrcType },
216 { SkXfermode::kExclusion_Mode, "Exclusion", kBasic_SrcType },
217 { SkXfermode::kMultiply_Mode, "Multiply", kAll_SrcType },
218 { SkXfermode::kHue_Mode, "Hue", kBasic_SrcType },
219 { SkXfermode::kSaturation_Mode, "Saturation", kBasic_SrcType },
220 { SkXfermode::kColor_Mode, "Color", kBasic_SrcType },
221 { SkXfermode::kLuminosity_Mode, "Luminosity", kBasic_SrcType },
222 };
223
224 const SkScalar w = SkIntToScalar(W);
225 const SkScalar h = SkIntToScalar(H);
226 SkMatrix m;
227 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
228 SkShader* s = SkShader::CreateBitmapShader(fBG,
229 SkShader::kRepeat_TileMode,
230 SkShader::kRepeat_TileMode,
231 &m);
232
233 SkPaint labelP;
234 labelP.setAntiAlias(true);
235 sk_tool_utils::set_portable_typeface(&labelP);
236 labelP.setTextAlign(SkPaint::kCenter_Align);
237
238 const int W = 5;
239
240 SkScalar x0 = 0;
241 SkScalar y0 = 0;
242 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) {
243 SkScalar x = x0, y = y0;
244 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
245 if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
246 continue;
247 }
248 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
249 SkAutoUnref aur(mode);
250 SkRect r;
251 r.set(x, y, x+w, y+h);
252
253 SkPaint p;
254 p.setStyle(SkPaint::kFill_Style);
255 p.setShader(s);
256 canvas->drawRect(r, p);
257
258 canvas->saveLayer(&r, NULL);
259 draw_mode(canvas, mode, static_cast<SrcType>(sourceType),
260 r.fLeft, r.fTop);
261 canvas->restore();
262
263 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
264 p.setStyle(SkPaint::kStroke_Style);
265 p.setShader(NULL);
266 canvas->drawRect(r, p);
267
268 #if 1
269 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
270 x + w/2, y - labelP.getTextSize()/2, labelP);
271 #endif
272 x += w + SkIntToScalar(10);
273 if ((i % W) == W - 1) {
274 x = x0;
275 y += h + SkIntToScalar(30);
276 }
277 }
278 if (y < 320) {
279 if (x > x0) {
280 y += h + SkIntToScalar(30);
281 }
282 y0 = y;
283 } else {
284 x0 += SkIntToScalar(400);
285 y0 = 0;
286 }
287 }
288 s->unref();
289 }
290
291 private:
292 typedef GM INHERITED;
293 };
294
295 //////////////////////////////////////////////////////////////////////////////
296
MyFactory(void *)297 static GM* MyFactory(void*) { return new XfermodesGM; }
298 static GMRegistry reg(MyFactory);
299
300 }
301