1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkBlendMode.h"
11 #include "include/core/SkCanvas.h"
12 #include "include/core/SkColor.h"
13 #include "include/core/SkFont.h"
14 #include "include/core/SkImageInfo.h"
15 #include "include/core/SkMatrix.h"
16 #include "include/core/SkPaint.h"
17 #include "include/core/SkRect.h"
18 #include "include/core/SkScalar.h"
19 #include "include/core/SkShader.h"
20 #include "include/core/SkSize.h"
21 #include "include/core/SkString.h"
22 #include "include/core/SkTileMode.h"
23 #include "include/core/SkTypeface.h"
24 #include "include/core/SkTypes.h"
25 #include "include/utils/SkTextUtils.h"
26 #include "tools/ToolUtils.h"
27 #include "tools/fonts/FontToolUtils.h"
28
29 enum SrcType {
30 //! A WxH image with a rectangle in the lower right.
31 kRectangleImage_SrcType = 0x01,
32 //! kRectangleImage_SrcType with an alpha of 34.5%.
33 kRectangleImageWithAlpha_SrcType = 0x02,
34 //! kRectnagleImageWithAlpha_SrcType scaled down by half.
35 kSmallRectangleImageWithAlpha_SrcType = 0x04,
36 //! kRectangleImage_SrcType drawn directly instead in an image.
37 kRectangle_SrcType = 0x08,
38 //! Two rectangles, first on the right half, second on the bottom half.
39 kQuarterClear_SrcType = 0x10,
40 //! kQuarterClear_SrcType in a layer.
41 kQuarterClearInLayer_SrcType = 0x20,
42 //! A W/2xH/2 transparent image.
43 kSmallTransparentImage_SrcType = 0x40,
44 //! kRectangleImage_SrcType drawn directly with a mask.
45 kRectangleWithMask_SrcType = 0x80,
46
47 kAll_SrcType = 0xFF, //!< All the source types.
48 kBasic_SrcType = 0x03, //!< Just basic source types.
49 };
50
51 const struct {
52 SkBlendMode fMode;
53 int fSourceTypeMask; // The source types to use this
54 // mode with. See draw_mode for
55 // an explanation of each type.
56 // PDF has to play some tricks
57 // to support the base modes,
58 // test those more extensively.
59 } gModes[] = {
60 { SkBlendMode::kClear, kAll_SrcType },
61 { SkBlendMode::kSrc, kAll_SrcType },
62 { SkBlendMode::kDst, kAll_SrcType },
63 { SkBlendMode::kSrcOver, kAll_SrcType },
64 { SkBlendMode::kDstOver, kAll_SrcType },
65 { SkBlendMode::kSrcIn, kAll_SrcType },
66 { SkBlendMode::kDstIn, kAll_SrcType },
67 { SkBlendMode::kSrcOut, kAll_SrcType },
68 { SkBlendMode::kDstOut, kAll_SrcType },
69 { SkBlendMode::kSrcATop, kAll_SrcType },
70 { SkBlendMode::kDstATop, kAll_SrcType },
71
72 { SkBlendMode::kXor, kBasic_SrcType },
73 { SkBlendMode::kPlus, kBasic_SrcType },
74 { SkBlendMode::kModulate, kAll_SrcType },
75 { SkBlendMode::kScreen, kBasic_SrcType },
76 { SkBlendMode::kOverlay, kBasic_SrcType },
77 { SkBlendMode::kDarken, kBasic_SrcType },
78 { SkBlendMode::kLighten, kBasic_SrcType },
79 { SkBlendMode::kColorDodge, kBasic_SrcType },
80 { SkBlendMode::kColorBurn, kBasic_SrcType },
81 { SkBlendMode::kHardLight, kBasic_SrcType },
82 { SkBlendMode::kSoftLight, kBasic_SrcType },
83 { SkBlendMode::kDifference, kBasic_SrcType },
84 { SkBlendMode::kExclusion, kBasic_SrcType },
85 { SkBlendMode::kMultiply, kAll_SrcType },
86 { SkBlendMode::kHue, kBasic_SrcType },
87 { SkBlendMode::kSaturation, kBasic_SrcType },
88 { SkBlendMode::kColor, kBasic_SrcType },
89 { SkBlendMode::kLuminosity, kBasic_SrcType },
90 };
91
make_bitmaps(int w,int h,SkBitmap * src,SkBitmap * dst,SkBitmap * transparent)92 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst,
93 SkBitmap* transparent) {
94 src->allocN32Pixels(w, h);
95 src->eraseColor(SK_ColorTRANSPARENT);
96
97 SkPaint p;
98 p.setAntiAlias(true);
99
100 SkRect r;
101 SkScalar ww = SkIntToScalar(w);
102 SkScalar hh = SkIntToScalar(h);
103
104 {
105 SkCanvas c(*src);
106 p.setColor(ToolUtils::color_to_565(0xFFFFCC44));
107 r.setWH(ww*3/4, hh*3/4);
108 c.drawOval(r, p);
109 }
110
111 dst->allocN32Pixels(w, h);
112 dst->eraseColor(SK_ColorTRANSPARENT);
113
114 {
115 SkCanvas c(*dst);
116 p.setColor(ToolUtils::color_to_565(0xFF66AAFF));
117 r.setLTRB(ww/3, hh/3, ww*19/20, hh*19/20);
118 c.drawRect(r, p);
119 }
120
121 transparent->allocN32Pixels(w, h);
122 transparent->eraseColor(SK_ColorTRANSPARENT);
123 }
124
125 static uint16_t gData[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
126
127 class XfermodesGM : public skiagm::GM {
128 SkBitmap fBG;
129 SkBitmap fSrcB, fDstB, fTransparent;
130
131 /* The srcType argument indicates what to draw for the source part. Skia
132 * uses the implied shape of the drawing command and these modes
133 * demonstrate that.
134 */
draw_mode(SkCanvas * canvas,SkBlendMode mode,SrcType srcType,SkScalar x,SkScalar y)135 void draw_mode(SkCanvas* canvas, SkBlendMode mode, SrcType srcType, SkScalar x, SkScalar y) {
136 SkPaint p;
137 SkSamplingOptions sampling;
138 SkMatrix m;
139 bool restoreNeeded = false;
140 m.setTranslate(x, y);
141
142 canvas->drawImage(fSrcB.asImage(), x, y, sampling, &p);
143 p.setBlendMode(mode);
144 switch (srcType) {
145 case kSmallTransparentImage_SrcType: {
146 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
147
148 SkAutoCanvasRestore acr(canvas, true);
149 canvas->concat(m);
150 canvas->drawImage(fTransparent.asImage(), 0, 0, sampling, &p);
151 break;
152 }
153 case kQuarterClearInLayer_SrcType: {
154 SkRect bounds = SkRect::MakeXYWH(x, y, SkIntToScalar(W),
155 SkIntToScalar(H));
156 canvas->saveLayer(&bounds, &p);
157 restoreNeeded = true;
158 p.setBlendMode(SkBlendMode::kSrcOver);
159 [[fallthrough]];
160 }
161 case kQuarterClear_SrcType: {
162 SkScalar halfW = SkIntToScalar(W) / 2;
163 SkScalar halfH = SkIntToScalar(H) / 2;
164 p.setColor(ToolUtils::color_to_565(0xFF66AAFF));
165 SkRect r = SkRect::MakeXYWH(x + halfW, y, halfW,
166 SkIntToScalar(H));
167 canvas->drawRect(r, p);
168 p.setColor(ToolUtils::color_to_565(0xFFAA66FF));
169 r = SkRect::MakeXYWH(x, y + halfH, SkIntToScalar(W), halfH);
170 canvas->drawRect(r, p);
171 break;
172 }
173 case kRectangleWithMask_SrcType: {
174 canvas->save();
175 restoreNeeded = true;
176 SkScalar w = SkIntToScalar(W);
177 SkScalar h = SkIntToScalar(H);
178 SkRect r = SkRect::MakeXYWH(x, y + h / 4, w, h * 23 / 60);
179 canvas->clipRect(r);
180 [[fallthrough]];
181 }
182 case kRectangle_SrcType: {
183 SkScalar w = SkIntToScalar(W);
184 SkScalar h = SkIntToScalar(H);
185 SkRect r = SkRect::MakeXYWH(x + w / 3, y + h / 3,
186 w * 37 / 60, h * 37 / 60);
187 p.setColor(ToolUtils::color_to_565(0xFF66AAFF));
188 canvas->drawRect(r, p);
189 break;
190 }
191 case kSmallRectangleImageWithAlpha_SrcType:
192 m.postScale(SK_ScalarHalf, SK_ScalarHalf, x, y);
193 [[fallthrough]];
194 case kRectangleImageWithAlpha_SrcType:
195 p.setAlpha(0x88);
196 [[fallthrough]];
197 case kRectangleImage_SrcType: {
198 SkAutoCanvasRestore acr(canvas, true);
199 canvas->concat(m);
200 canvas->drawImage(fDstB.asImage(), 0, 0, sampling, &p);
201 break;
202 }
203 default:
204 break;
205 }
206
207 if (restoreNeeded) {
208 canvas->restore();
209 }
210 }
211
onOnceBeforeDraw()212 void onOnceBeforeDraw() override {
213 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType,
214 kOpaque_SkAlphaType),
215 gData, 4);
216
217 make_bitmaps(W, H, &fSrcB, &fDstB, &fTransparent);
218 }
219
220 public:
221 const static int W = 64;
222 const static int H = 64;
XfermodesGM()223 XfermodesGM() {}
224
225 protected:
getName() const226 SkString getName() const override { return SkString("xfermodes"); }
227
getISize()228 SkISize getISize() override { return SkISize::Make(1990, 570); }
229
onDraw(SkCanvas * canvas)230 void onDraw(SkCanvas* canvas) override {
231 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
232
233 const SkScalar w = SkIntToScalar(W);
234 const SkScalar h = SkIntToScalar(H);
235 SkMatrix m;
236 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
237 auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat,
238 SkSamplingOptions(), m);
239
240 SkPaint labelP;
241 labelP.setAntiAlias(true);
242
243 SkFont font = ToolUtils::DefaultPortableFont();
244
245 const int kWrap = 5;
246
247 SkScalar x0 = 0;
248 SkScalar y0 = 0;
249 for (int sourceType = 1; sourceType & kAll_SrcType; sourceType <<= 1) {
250 SkScalar x = x0, y = y0;
251 for (size_t i = 0; i < std::size(gModes); i++) {
252 if ((gModes[i].fSourceTypeMask & sourceType) == 0) {
253 continue;
254 }
255 SkRect r{ x, y, x+w, y+h };
256
257 SkPaint p;
258 p.setStyle(SkPaint::kFill_Style);
259 p.setShader(s);
260 canvas->drawRect(r, p);
261
262 canvas->saveLayer(&r, nullptr);
263 draw_mode(canvas, gModes[i].fMode, static_cast<SrcType>(sourceType),
264 r.fLeft, r.fTop);
265 canvas->restore();
266
267 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
268 p.setStyle(SkPaint::kStroke_Style);
269 p.setShader(nullptr);
270 canvas->drawRect(r, p);
271
272 #if 1
273 const char* label = SkBlendMode_Name(gModes[i].fMode);
274 SkTextUtils::DrawString(canvas, label, x + w/2, y - font.getSize()/2,
275 font, labelP, SkTextUtils::kCenter_Align);
276 #endif
277 x += w + SkIntToScalar(10);
278 if ((i % kWrap) == kWrap - 1) {
279 x = x0;
280 y += h + SkIntToScalar(30);
281 }
282 }
283 if (y < 320) {
284 if (x > x0) {
285 y += h + SkIntToScalar(30);
286 }
287 y0 = y;
288 } else {
289 x0 += SkIntToScalar(400);
290 y0 = 0;
291 }
292 }
293 }
294
295 private:
296 using INHERITED = GM;
297 };
298 DEF_GM( return new XfermodesGM; )
299