1 /*
2 * Copyright 2012 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 "SkCanvas.h"
10 #include "SkPaint.h"
11 #include "SkDashPathEffect.h"
12
drawline(SkCanvas * canvas,int on,int off,const SkPaint & paint,SkScalar finalX=SkIntToScalar (600),SkScalar finalY=SkIntToScalar (0),SkScalar phase=SkIntToScalar (0))13 static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint,
14 SkScalar finalX = SkIntToScalar(600), SkScalar finalY = SkIntToScalar(0),
15 SkScalar phase = SkIntToScalar(0)) {
16 SkPaint p(paint);
17
18 const SkScalar intervals[] = {
19 SkIntToScalar(on),
20 SkIntToScalar(off),
21 };
22
23 p.setPathEffect(SkDashPathEffect::Create(intervals, 2, phase))->unref();
24 canvas->drawLine(0, 0, finalX, finalY, p);
25 }
26
27 // earlier bug stopped us from drawing very long single-segment dashes, because
28 // SkPathMeasure was skipping very small delta-T values (nearlyzero). This is
29 // now fixes, so this giant dash should appear.
show_giant_dash(SkCanvas * canvas)30 static void show_giant_dash(SkCanvas* canvas) {
31 SkPaint paint;
32
33 drawline(canvas, 1, 1, paint, SkIntToScalar(20 * 1000));
34 }
35
36 class DashingGM : public skiagm::GM {
37 public:
DashingGM()38 DashingGM() {}
39
40 protected:
onGetFlags() const41 virtual uint32_t onGetFlags() const SK_OVERRIDE {
42 return kSkipTiled_Flag;
43 }
44
onShortName()45 SkString onShortName() {
46 return SkString("dashing");
47 }
48
onISize()49 SkISize onISize() { return SkISize::Make(640, 300); }
50
onDraw(SkCanvas * canvas)51 virtual void onDraw(SkCanvas* canvas) {
52 static const struct {
53 int fOnInterval;
54 int fOffInterval;
55 } gData[] = {
56 { 1, 1 },
57 { 4, 1 },
58 };
59
60 SkPaint paint;
61 paint.setStyle(SkPaint::kStroke_Style);
62
63 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
64 canvas->translate(0, SK_ScalarHalf);
65 for (int width = 0; width <= 2; ++width) {
66 for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
67 for (int aa = 0; aa <= 1; ++aa) {
68 int w = width * width * width;
69 paint.setAntiAlias(SkToBool(aa));
70 paint.setStrokeWidth(SkIntToScalar(w));
71
72 int scale = w ? w : 1;
73
74 drawline(canvas, gData[data].fOnInterval * scale,
75 gData[data].fOffInterval * scale,
76 paint);
77 canvas->translate(0, SkIntToScalar(20));
78 }
79 }
80 }
81
82 show_giant_dash(canvas);
83 }
84 };
85
86 ///////////////////////////////////////////////////////////////////////////////
87
make_unit_star(SkPath * path,int n)88 static void make_unit_star(SkPath* path, int n) {
89 SkScalar rad = -SK_ScalarPI / 2;
90 const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
91
92 path->moveTo(0, -SK_Scalar1);
93 for (int i = 1; i < n; i++) {
94 rad += drad;
95 SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
96 path->lineTo(cosV, sinV);
97 }
98 path->close();
99 }
100
make_path_line(SkPath * path,const SkRect & bounds)101 static void make_path_line(SkPath* path, const SkRect& bounds) {
102 path->moveTo(bounds.left(), bounds.top());
103 path->lineTo(bounds.right(), bounds.bottom());
104 }
105
make_path_rect(SkPath * path,const SkRect & bounds)106 static void make_path_rect(SkPath* path, const SkRect& bounds) {
107 path->addRect(bounds);
108 }
109
make_path_oval(SkPath * path,const SkRect & bounds)110 static void make_path_oval(SkPath* path, const SkRect& bounds) {
111 path->addOval(bounds);
112 }
113
make_path_star(SkPath * path,const SkRect & bounds)114 static void make_path_star(SkPath* path, const SkRect& bounds) {
115 make_unit_star(path, 5);
116 SkMatrix matrix;
117 matrix.setRectToRect(path->getBounds(), bounds, SkMatrix::kCenter_ScaleToFit);
118 path->transform(matrix);
119 }
120
121 class Dashing2GM : public skiagm::GM {
122 public:
Dashing2GM()123 Dashing2GM() {}
124
125 protected:
onGetFlags() const126 virtual uint32_t onGetFlags() const SK_OVERRIDE {
127 return kSkipTiled_Flag;
128 }
129
onShortName()130 SkString onShortName() {
131 return SkString("dashing2");
132 }
133
onISize()134 SkISize onISize() { return SkISize::Make(640, 480); }
135
onDraw(SkCanvas * canvas)136 virtual void onDraw(SkCanvas* canvas) {
137 static const int gIntervals[] = {
138 3, // 3 dashes: each count [0] followed by intervals [1..count]
139 2, 10, 10,
140 4, 20, 5, 5, 5,
141 2, 2, 2
142 };
143
144 void (*gProc[])(SkPath*, const SkRect&) = {
145 make_path_line, make_path_rect, make_path_oval, make_path_star,
146 };
147
148 SkPaint paint;
149 paint.setAntiAlias(true);
150 paint.setStyle(SkPaint::kStroke_Style);
151 paint.setStrokeWidth(SkIntToScalar(6));
152
153 SkRect bounds = SkRect::MakeWH(SkIntToScalar(120), SkIntToScalar(120));
154 bounds.offset(SkIntToScalar(20), SkIntToScalar(20));
155 SkScalar dx = bounds.width() * 4 / 3;
156 SkScalar dy = bounds.height() * 4 / 3;
157
158 const int* intervals = &gIntervals[1];
159 for (int y = 0; y < gIntervals[0]; ++y) {
160 SkScalar vals[SK_ARRAY_COUNT(gIntervals)]; // more than enough
161 int count = *intervals++;
162 for (int i = 0; i < count; ++i) {
163 vals[i] = SkIntToScalar(*intervals++);
164 }
165 SkScalar phase = vals[0] / 2;
166 paint.setPathEffect(SkDashPathEffect::Create(vals, count, phase))->unref();
167
168 for (size_t x = 0; x < SK_ARRAY_COUNT(gProc); ++x) {
169 SkPath path;
170 SkRect r = bounds;
171 r.offset(x * dx, y * dy);
172 gProc[x](&path, r);
173
174 canvas->drawPath(path, paint);
175 }
176 }
177 }
178 };
179
180 //////////////////////////////////////////////////////////////////////////////
181
182 // Test out the on/off line dashing Chrome if fond of
183 class Dashing3GM : public skiagm::GM {
184 public:
Dashing3GM()185 Dashing3GM() {}
186
187 protected:
onGetFlags() const188 virtual uint32_t onGetFlags() const SK_OVERRIDE {
189 return kSkipTiled_Flag;
190 }
191
onShortName()192 SkString onShortName() {
193 return SkString("dashing3");
194 }
195
onISize()196 SkISize onISize() { return SkISize::Make(640, 480); }
197
198 // Draw a 100x100 block of dashed lines. The horizontal ones are BW
199 // while the vertical ones are AA.
drawDashedLines(SkCanvas * canvas,SkScalar lineLength,SkScalar phase,SkScalar dashLength,int strokeWidth,bool circles)200 void drawDashedLines(SkCanvas* canvas,
201 SkScalar lineLength,
202 SkScalar phase,
203 SkScalar dashLength,
204 int strokeWidth,
205 bool circles) {
206 SkPaint p;
207 p.setColor(SK_ColorBLACK);
208 p.setStyle(SkPaint::kStroke_Style);
209 p.setStrokeWidth(SkIntToScalar(strokeWidth));
210
211 if (circles) {
212 p.setStrokeCap(SkPaint::kRound_Cap);
213 }
214
215 SkScalar intervals[2] = { dashLength, dashLength };
216
217 p.setPathEffect(SkDashPathEffect::Create(intervals, 2, phase))->unref();
218
219 SkPoint pts[2];
220
221 for (int y = 0; y < 100; y += 10*strokeWidth) {
222 pts[0].set(0, SkIntToScalar(y));
223 pts[1].set(lineLength, SkIntToScalar(y));
224
225 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
226 }
227
228 p.setAntiAlias(true);
229
230 for (int x = 0; x < 100; x += 14*strokeWidth) {
231 pts[0].set(SkIntToScalar(x), 0);
232 pts[1].set(SkIntToScalar(x), lineLength);
233
234 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, pts, p);
235 }
236 }
237
onDraw(SkCanvas * canvas)238 virtual void onDraw(SkCanvas* canvas) {
239 // 1on/1off 1x1 squares with phase of 0 - points fastpath
240 canvas->save();
241 canvas->translate(2, 0);
242 this->drawDashedLines(canvas, 100, 0, SK_Scalar1, 1, false);
243 canvas->restore();
244
245 // 1on/1off 1x1 squares with phase of .5 - rects fastpath (due to partial squares)
246 canvas->save();
247 canvas->translate(112, 0);
248 this->drawDashedLines(canvas, 100, SK_ScalarHalf, SK_Scalar1, 1, false);
249 canvas->restore();
250
251 // 1on/1off 1x1 squares with phase of 1 - points fastpath
252 canvas->save();
253 canvas->translate(222, 0);
254 this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
255 canvas->restore();
256
257 // 1on/1off 1x1 squares with phase of 1 and non-integer length - rects fastpath
258 canvas->save();
259 canvas->translate(332, 0);
260 this->drawDashedLines(canvas, 99.5f, SK_ScalarHalf, SK_Scalar1, 1, false);
261 canvas->restore();
262
263 // 255on/255off 1x1 squares with phase of 0 - rects fast path
264 canvas->save();
265 canvas->translate(446, 0);
266 this->drawDashedLines(canvas, 100, 0, SkIntToScalar(255), 1, false);
267 canvas->restore();
268
269 // 1on/1off 3x3 squares with phase of 0 - points fast path
270 canvas->save();
271 canvas->translate(2, 110);
272 this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, false);
273 canvas->restore();
274
275 // 1on/1off 3x3 squares with phase of 1.5 - rects fast path
276 canvas->save();
277 canvas->translate(112, 110);
278 this->drawDashedLines(canvas, 100, 1.5f, SkIntToScalar(3), 3, false);
279 canvas->restore();
280
281 // 1on/1off 1x1 circles with phase of 1 - no fast path yet
282 canvas->save();
283 canvas->translate(2, 220);
284 this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, true);
285 canvas->restore();
286
287 // 1on/1off 3x3 circles with phase of 1 - no fast path yet
288 canvas->save();
289 canvas->translate(112, 220);
290 this->drawDashedLines(canvas, 100, 0, SkIntToScalar(3), 3, true);
291 canvas->restore();
292
293 // 1on/1off 1x1 squares with rotation - should break fast path
294 canvas->save();
295 canvas->translate(332+SK_ScalarRoot2Over2*100, 110+SK_ScalarRoot2Over2*100);
296 canvas->rotate(45);
297 canvas->translate(-50, -50);
298
299 this->drawDashedLines(canvas, 100, SK_Scalar1, SK_Scalar1, 1, false);
300 canvas->restore();
301
302 // 3on/3off 3x1 rects - should use rect fast path regardless of phase
303 for (int phase = 0; phase <= 3; ++phase) {
304 canvas->save();
305 canvas->translate(SkIntToScalar(phase*110+2),
306 SkIntToScalar(330));
307 this->drawDashedLines(canvas, 100, SkIntToScalar(phase), SkIntToScalar(3), 1, false);
308 canvas->restore();
309 }
310 }
311
312 };
313
314 //////////////////////////////////////////////////////////////////////////////
315
316 class Dashing4GM : public skiagm::GM {
317 public:
Dashing4GM()318 Dashing4GM() {}
319
320 protected:
onGetFlags() const321 virtual uint32_t onGetFlags() const SK_OVERRIDE {
322 return kSkipTiled_Flag;
323 }
324
onShortName()325 SkString onShortName() {
326 return SkString("dashing4");
327 }
328
onISize()329 SkISize onISize() { return SkISize::Make(640, 950); }
330
onDraw(SkCanvas * canvas)331 virtual void onDraw(SkCanvas* canvas) {
332 static const struct {
333 int fOnInterval;
334 int fOffInterval;
335 } gData[] = {
336 { 1, 1 },
337 { 4, 2 },
338 { 0, 4 }, // test for zero length on interval
339 };
340
341 SkPaint paint;
342 paint.setStyle(SkPaint::kStroke_Style);
343
344 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
345 canvas->translate(0, SK_ScalarHalf);
346
347 for (int width = 0; width <= 2; ++width) {
348 for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
349 for (int aa = 0; aa <= 1; ++aa) {
350 for (int cap = 0; cap <= 1; ++cap) {
351 int w = width * width * width;
352 paint.setAntiAlias(SkToBool(aa));
353 paint.setStrokeWidth(SkIntToScalar(w));
354
355 SkToBool(cap) ? paint.setStrokeCap(SkPaint::kSquare_Cap)
356 : paint.setStrokeCap(SkPaint::kRound_Cap);
357
358 int scale = w ? w : 1;
359
360 drawline(canvas, gData[data].fOnInterval * scale,
361 gData[data].fOffInterval * scale,
362 paint);
363 canvas->translate(0, SkIntToScalar(20));
364 }
365 }
366 }
367 }
368
369 for (int aa = 0; aa <= 1; ++aa) {
370 paint.setAntiAlias(SkToBool(aa));
371 paint.setStrokeWidth(8.f);
372 paint.setStrokeCap(SkPaint::kSquare_Cap);
373 // Single dash element that is cut off at start and end
374 drawline(canvas, 32, 16, paint, 20.f, 0, 5.f);
375 canvas->translate(0, SkIntToScalar(20));
376
377 // Two dash elements where each one is cut off at beginning and end respectively
378 drawline(canvas, 32, 16, paint, 56.f, 0, 5.f);
379 canvas->translate(0, SkIntToScalar(20));
380
381 // Many dash elements where first and last are cut off at beginning and end respectively
382 drawline(canvas, 32, 16, paint, 584.f, 0, 5.f);
383 canvas->translate(0, SkIntToScalar(20));
384
385 // Diagonal dash line where src pnts are not axis aligned (as apposed to being diagonal from
386 // a canvas rotation)
387 drawline(canvas, 32, 16, paint, 600.f, 30.f);
388 canvas->translate(0, SkIntToScalar(20));
389
390 // Case where only the off interval exists on the line. Thus nothing should be drawn
391 drawline(canvas, 32, 16, paint, 8.f, 0.f, 40.f);
392 canvas->translate(0, SkIntToScalar(20));
393 }
394 }
395 };
396
397 //////////////////////////////////////////////////////////////////////////////
398
F0(void *)399 static skiagm::GM* F0(void*) { return new DashingGM; }
F1(void *)400 static skiagm::GM* F1(void*) { return new Dashing2GM; }
F2(void *)401 static skiagm::GM* F2(void*) { return new Dashing3GM; }
F3(void *)402 static skiagm::GM* F3(void*) { return new Dashing4GM; }
403
404 static skiagm::GMRegistry gR0(F0);
405 static skiagm::GMRegistry gR1(F1);
406 static skiagm::GMRegistry gR2(F2);
407 static skiagm::GMRegistry gR3(F3);
408