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