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 "SampleCode.h"
9 #include "SkBlurMask.h"
10 #include "SkBlurMaskFilter.h"
11 #include "SkCanvas.h"
12 #include "SkDevice.h"
13 #include "SkReadBuffer.h"
14 #include "SkWriteBuffer.h"
15 #include "SkGradientShader.h"
16 #include "SkLayerRasterizer.h"
17 #include "SkPaint.h"
18 #include "SkView.h"
19
20 #define BG_COLOR 0xFFDDDDDD
21
22 typedef void (*SlideProc)(SkCanvas*);
23
24 ///////////////////////////////////////////////////////////////////////////////
25
26 #include "Sk1DPathEffect.h"
27 #include "Sk2DPathEffect.h"
28 #include "SkCornerPathEffect.h"
29 #include "SkDashPathEffect.h"
30 #include "SkDiscretePathEffect.h"
31
compose_pe(SkPaint * paint)32 static void compose_pe(SkPaint* paint) {
33 SkPathEffect* pe = paint->getPathEffect();
34 SkPathEffect* corner = SkCornerPathEffect::Create(25);
35 SkPathEffect* compose;
36 if (pe) {
37 compose = SkComposePathEffect::Create(pe, corner);
38 corner->unref();
39 } else {
40 compose = corner;
41 }
42 paint->setPathEffect(compose)->unref();
43 }
44
hair_pe(SkPaint * paint)45 static void hair_pe(SkPaint* paint) {
46 paint->setStrokeWidth(0);
47 }
48
hair2_pe(SkPaint * paint)49 static void hair2_pe(SkPaint* paint) {
50 paint->setStrokeWidth(0);
51 compose_pe(paint);
52 }
53
stroke_pe(SkPaint * paint)54 static void stroke_pe(SkPaint* paint) {
55 paint->setStrokeWidth(12);
56 compose_pe(paint);
57 }
58
dash_pe(SkPaint * paint)59 static void dash_pe(SkPaint* paint) {
60 SkScalar inter[] = { 20, 10, 10, 10 };
61 paint->setStrokeWidth(12);
62 paint->setPathEffect(SkDashPathEffect::Create(inter, SK_ARRAY_COUNT(inter),
63 0))->unref();
64 compose_pe(paint);
65 }
66
67 static const int gXY[] = {
68 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
69 };
70
scale(SkPath * path,SkScalar scale)71 static void scale(SkPath* path, SkScalar scale) {
72 SkMatrix m;
73 m.setScale(scale, scale);
74 path->transform(m);
75 }
76
one_d_pe(SkPaint * paint)77 static void one_d_pe(SkPaint* paint) {
78 SkPath path;
79 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
80 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
81 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
82 path.close();
83 path.offset(SkIntToScalar(-6), 0);
84 scale(&path, 1.5f);
85
86 paint->setPathEffect(SkPath1DPathEffect::Create(path, SkIntToScalar(21), 0,
87 SkPath1DPathEffect::kRotate_Style))->unref();
88 compose_pe(paint);
89 }
90
91 typedef void (*PE_Proc)(SkPaint*);
92 static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
93
fill_pe(SkPaint * paint)94 static void fill_pe(SkPaint* paint) {
95 paint->setStyle(SkPaint::kFill_Style);
96 paint->setPathEffect(nullptr);
97 }
98
discrete_pe(SkPaint * paint)99 static void discrete_pe(SkPaint* paint) {
100 paint->setPathEffect(SkDiscretePathEffect::Create(10, 4))->unref();
101 }
102
MakeTileEffect()103 static SkPathEffect* MakeTileEffect() {
104 SkMatrix m;
105 m.setScale(SkIntToScalar(12), SkIntToScalar(12));
106
107 SkPath path;
108 path.addCircle(0, 0, SkIntToScalar(5));
109
110 return SkPath2DPathEffect::Create(m, path);
111 }
112
tile_pe(SkPaint * paint)113 static void tile_pe(SkPaint* paint) {
114 paint->setPathEffect(MakeTileEffect())->unref();
115 }
116
117 static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
118
patheffect_slide(SkCanvas * canvas)119 static void patheffect_slide(SkCanvas* canvas) {
120 SkPaint paint;
121 paint.setAntiAlias(true);
122 paint.setStyle(SkPaint::kStroke_Style);
123
124 SkPath path;
125 path.moveTo(20, 20);
126 path.lineTo(70, 120);
127 path.lineTo(120, 30);
128 path.lineTo(170, 80);
129 path.lineTo(240, 50);
130
131 size_t i;
132 canvas->save();
133 for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
134 gPE[i](&paint);
135 canvas->drawPath(path, paint);
136 canvas->translate(0, 75);
137 }
138 canvas->restore();
139
140 path.reset();
141 SkRect r = { 0, 0, 250, 120 };
142 path.addOval(r, SkPath::kCW_Direction);
143 r.inset(50, 50);
144 path.addRect(r, SkPath::kCCW_Direction);
145
146 canvas->translate(320, 20);
147 for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
148 gPE2[i](&paint);
149 canvas->drawPath(path, paint);
150 canvas->translate(0, 160);
151 }
152 }
153
154 ///////////////////////////////////////////////////////////////////////////////
155
156 #include "SkGradientShader.h"
157
158 struct GradData {
159 int fCount;
160 const SkColor* fColors;
161 const SkScalar* fPos;
162 };
163
164 static const SkColor gColors[] = {
165 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
166 };
167 static const SkScalar gPos0[] = { 0, SK_Scalar1 };
168 static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
169 static const SkScalar gPos2[] = {
170 0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
171 };
172
173 static const GradData gGradData[] = {
174 { 2, gColors, nullptr },
175 { 2, gColors, gPos0 },
176 { 2, gColors, gPos1 },
177 { 5, gColors, nullptr },
178 { 5, gColors, gPos2 }
179 };
180
MakeLinear(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)181 static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
182 return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
183 }
184
MakeRadial(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)185 static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
186 SkPoint center;
187 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
188 SkScalarAve(pts[0].fY, pts[1].fY));
189 return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
190 data.fPos, data.fCount, tm);
191 }
192
MakeSweep(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)193 static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
194 SkPoint center;
195 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
196 SkScalarAve(pts[0].fY, pts[1].fY));
197 return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
198 }
199
Make2Conical(const SkPoint pts[2],const GradData & data,SkShader::TileMode tm)200 static SkShader* Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
201 SkPoint center0, center1;
202 center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
203 SkScalarAve(pts[0].fY, pts[1].fY));
204 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
205 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
206 return SkGradientShader::CreateTwoPointConical(
207 center1, (pts[1].fX - pts[0].fX) / 7,
208 center0, (pts[1].fX - pts[0].fX) / 2,
209 data.fColors, data.fPos, data.fCount, tm);
210 }
211
212 typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
213 static const GradMaker gGradMakers[] = {
214 MakeLinear, MakeRadial, MakeSweep, Make2Conical
215 };
216
gradient_slide(SkCanvas * canvas)217 static void gradient_slide(SkCanvas* canvas) {
218 SkPoint pts[2] = {
219 { 0, 0 },
220 { SkIntToScalar(100), SkIntToScalar(100) }
221 };
222 SkShader::TileMode tm = SkShader::kClamp_TileMode;
223 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
224 SkPaint paint;
225 paint.setAntiAlias(true);
226 paint.setDither(true);
227
228 canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
229 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
230 canvas->save();
231 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
232 SkShader* shader = gGradMakers[j](pts, gGradData[i], tm);
233 paint.setShader(shader);
234 canvas->drawRect(r, paint);
235 shader->unref();
236 canvas->translate(0, SkIntToScalar(120));
237 }
238 canvas->restore();
239 canvas->translate(SkIntToScalar(120), 0);
240 }
241 }
242
243 ///////////////////////////////////////////////////////////////////////////////
244
245 #include "SkPathMeasure.h"
246
getpathlen(const SkPath & path)247 static SkScalar getpathlen(const SkPath& path) {
248 SkPathMeasure meas(path, false);
249 return meas.getLength();
250 }
251
textonpath_slide(SkCanvas * canvas)252 static void textonpath_slide(SkCanvas* canvas) {
253 const char* text = "Displacement";
254 size_t len =strlen(text);
255 SkPath path;
256 path.moveTo(100, 300);
257 path.quadTo(300, 100, 500, 300);
258 path.offset(0, -100);
259
260 SkPaint paint;
261 paint.setAntiAlias(true);
262 paint.setTextSize(40);
263
264 paint.setStyle(SkPaint::kStroke_Style);
265 canvas->drawPath(path, paint);
266 paint.setStyle(SkPaint::kFill_Style);
267
268 SkScalar x = 50;
269 paint.setColor(0xFF008800);
270 canvas->drawTextOnPathHV(text, len, path,
271 x, paint.getTextSize()*2/3, paint);
272 paint.setColor(SK_ColorRED);
273 canvas->drawTextOnPathHV(text, len, path,
274 x + 60, 0, paint);
275 paint.setColor(SK_ColorBLUE);
276 canvas->drawTextOnPathHV(text, len, path,
277 x + 120, -paint.getTextSize()*2/3, paint);
278
279 path.offset(0, 200);
280 paint.setTextAlign(SkPaint::kRight_Align);
281
282 text = "Matrices";
283 len = strlen(text);
284 SkScalar pathLen = getpathlen(path);
285 SkMatrix matrix;
286
287 paint.setColor(SK_ColorBLACK);
288 paint.setStyle(SkPaint::kStroke_Style);
289 canvas->drawPath(path, paint);
290 paint.setStyle(SkPaint::kFill_Style);
291
292 paint.setTextSize(50);
293 canvas->drawTextOnPath(text, len, path, nullptr, paint);
294
295 paint.setColor(SK_ColorRED);
296 matrix.setScale(-SK_Scalar1, SK_Scalar1);
297 matrix.postTranslate(pathLen, 0);
298 canvas->drawTextOnPath(text, len, path, &matrix, paint);
299
300 paint.setColor(SK_ColorBLUE);
301 matrix.setScale(SK_Scalar1, -SK_Scalar1);
302 canvas->drawTextOnPath(text, len, path, &matrix, paint);
303
304 paint.setColor(0xFF008800);
305 matrix.setScale(-SK_Scalar1, -SK_Scalar1);
306 matrix.postTranslate(pathLen, 0);
307 canvas->drawTextOnPath(text, len, path, &matrix, paint);
308 }
309
310 ///////////////////////////////////////////////////////////////////////////////
311
312 #include "SkImageDecoder.h"
313 #include "SkOSFile.h"
314 #include "SkRandom.h"
315 #include "SkStream.h"
316
make_shader0(SkIPoint * size)317 static SkShader* make_shader0(SkIPoint* size) {
318 SkBitmap bm;
319
320 SkImageDecoder::DecodeFile("/skimages/logo.gif", &bm);
321 size->set(bm.width(), bm.height());
322 return SkShader::CreateBitmapShader(bm, SkShader::kClamp_TileMode,
323 SkShader::kClamp_TileMode);
324 }
325
make_shader1(const SkIPoint & size)326 static SkShader* make_shader1(const SkIPoint& size) {
327 SkPoint pts[] = { { 0, 0 },
328 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
329 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
330 return SkGradientShader::CreateLinear(pts, colors, nullptr,
331 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode);
332 }
333
334 class Rec {
335 public:
336 SkCanvas::VertexMode fMode;
337 int fCount;
338 SkPoint* fVerts;
339 SkPoint* fTexs;
340
Rec()341 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
~Rec()342 ~Rec() { delete[] fVerts; delete[] fTexs; }
343 };
344
make_tris(Rec * rec)345 static void make_tris(Rec* rec) {
346 int n = 10;
347 SkRandom rand;
348
349 rec->fMode = SkCanvas::kTriangles_VertexMode;
350 rec->fCount = n * 3;
351 rec->fVerts = new SkPoint[rec->fCount];
352
353 for (int i = 0; i < n; i++) {
354 SkPoint* v = &rec->fVerts[i*3];
355 for (int j = 0; j < 3; j++) {
356 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
357 }
358 }
359 }
360
make_fan(Rec * rec,int texWidth,int texHeight)361 static void make_fan(Rec* rec, int texWidth, int texHeight) {
362 const SkScalar tx = SkIntToScalar(texWidth);
363 const SkScalar ty = SkIntToScalar(texHeight);
364 const int n = 24;
365
366 rec->fMode = SkCanvas::kTriangleFan_VertexMode;
367 rec->fCount = n + 2;
368 rec->fVerts = new SkPoint[rec->fCount];
369 rec->fTexs = new SkPoint[rec->fCount];
370
371 SkPoint* v = rec->fVerts;
372 SkPoint* t = rec->fTexs;
373
374 v[0].set(0, 0);
375 t[0].set(0, 0);
376 for (int i = 0; i < n; i++) {
377 SkScalar cos;
378 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
379 v[i+1].set(cos, sin);
380 t[i+1].set(i*tx/n, ty);
381 }
382 v[n+1] = v[1];
383 t[n+1].set(tx, ty);
384
385 SkMatrix m;
386 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
387 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
388 m.mapPoints(v, rec->fCount);
389 }
390
make_strip(Rec * rec,int texWidth,int texHeight)391 static void make_strip(Rec* rec, int texWidth, int texHeight) {
392 const SkScalar tx = SkIntToScalar(texWidth);
393 const SkScalar ty = SkIntToScalar(texHeight);
394 const int n = 24;
395
396 rec->fMode = SkCanvas::kTriangleStrip_VertexMode;
397 rec->fCount = 2 * (n + 1);
398 rec->fVerts = new SkPoint[rec->fCount];
399 rec->fTexs = new SkPoint[rec->fCount];
400
401 SkPoint* v = rec->fVerts;
402 SkPoint* t = rec->fTexs;
403
404 for (int i = 0; i < n; i++) {
405 SkScalar cos;
406 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
407 v[i*2 + 0].set(cos/2, sin/2);
408 v[i*2 + 1].set(cos, sin);
409
410 t[i*2 + 0].set(tx * i / n, ty);
411 t[i*2 + 1].set(tx * i / n, 0);
412 }
413 v[2*n + 0] = v[0];
414 v[2*n + 1] = v[1];
415
416 t[2*n + 0].set(tx, ty);
417 t[2*n + 1].set(tx, 0);
418
419 SkMatrix m;
420 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
421 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
422 m.mapPoints(v, rec->fCount);
423 }
424
mesh_slide(SkCanvas * canvas)425 static void mesh_slide(SkCanvas* canvas) {
426 Rec fRecs[3];
427 SkIPoint size;
428
429 SkShader* fShader0 = make_shader0(&size);
430 SkShader* fShader1 = make_shader1(size);
431
432 SkAutoUnref aur0(fShader0);
433 SkAutoUnref aur1(fShader1);
434
435 make_strip(&fRecs[0], size.fX, size.fY);
436 make_fan(&fRecs[1], size.fX, size.fY);
437 make_tris(&fRecs[2]);
438
439 SkPaint paint;
440 paint.setDither(true);
441 paint.setFilterQuality(kLow_SkFilterQuality);
442
443 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
444 canvas->save();
445
446 paint.setShader(nullptr);
447 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
448 fRecs[i].fVerts, fRecs[i].fTexs,
449 nullptr, nullptr, nullptr, 0, paint);
450
451 canvas->translate(SkIntToScalar(210), 0);
452
453 paint.setShader(fShader0);
454 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
455 fRecs[i].fVerts, fRecs[i].fTexs,
456 nullptr, nullptr, nullptr, 0, paint);
457
458 canvas->translate(SkIntToScalar(210), 0);
459
460 paint.setShader(fShader1);
461 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
462 fRecs[i].fVerts, fRecs[i].fTexs,
463 nullptr, nullptr, nullptr, 0, paint);
464 canvas->restore();
465
466 canvas->translate(0, SkIntToScalar(250));
467 }
468 }
469
470 ///////////////////////////////////////////////////////////////////////////////
471
r0(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)472 static void r0(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
473 {
474 p.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
475 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))))->unref();
476 rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
477
478 p.setMaskFilter(nullptr);
479 p.setStyle(SkPaint::kStroke_Style);
480 p.setStrokeWidth(SK_Scalar1);
481 rastBuilder->addLayer(p);
482
483 p.setAlpha(0x11);
484 p.setStyle(SkPaint::kFill_Style);
485 p.setXfermodeMode(SkXfermode::kSrc_Mode);
486 rastBuilder->addLayer(p);
487 }
488
r1(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)489 static void r1(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
490 {
491 rastBuilder->addLayer(p);
492
493 p.setAlpha(0x40);
494 p.setXfermodeMode(SkXfermode::kSrc_Mode);
495 p.setStyle(SkPaint::kStroke_Style);
496 p.setStrokeWidth(SK_Scalar1*2);
497 rastBuilder->addLayer(p);
498 }
499
r2(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)500 static void r2(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
501 {
502 p.setStyle(SkPaint::kStrokeAndFill_Style);
503 p.setStrokeWidth(SK_Scalar1*4);
504 rastBuilder->addLayer(p);
505
506 p.setStyle(SkPaint::kStroke_Style);
507 p.setStrokeWidth(SK_Scalar1*3/2);
508 p.setXfermodeMode(SkXfermode::kClear_Mode);
509 rastBuilder->addLayer(p);
510 }
511
r3(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)512 static void r3(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
513 {
514 p.setStyle(SkPaint::kStroke_Style);
515 p.setStrokeWidth(SK_Scalar1*3);
516 rastBuilder->addLayer(p);
517
518 p.setAlpha(0x20);
519 p.setStyle(SkPaint::kFill_Style);
520 p.setXfermodeMode(SkXfermode::kSrc_Mode);
521 rastBuilder->addLayer(p);
522 }
523
r4(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)524 static void r4(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
525 {
526 p.setAlpha(0x60);
527 rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
528
529 p.setAlpha(0xFF);
530 p.setXfermodeMode(SkXfermode::kClear_Mode);
531 rastBuilder->addLayer(p, SK_Scalar1*3/2, SK_Scalar1*3/2);
532
533 p.setXfermode(nullptr);
534 rastBuilder->addLayer(p);
535 }
536
537 #include "SkDiscretePathEffect.h"
538
r5(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)539 static void r5(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
540 {
541 rastBuilder->addLayer(p);
542
543 p.setPathEffect(SkDiscretePathEffect::Create(SK_Scalar1*4, SK_Scalar1*3))->unref();
544 p.setXfermodeMode(SkXfermode::kSrcOut_Mode);
545 rastBuilder->addLayer(p);
546 }
547
r6(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)548 static void r6(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
549 {
550 rastBuilder->addLayer(p);
551
552 p.setAntiAlias(false);
553 SkLayerRasterizer::Builder rastBuilder2;
554 r5(&rastBuilder2, p);
555 p.setRasterizer(rastBuilder2.detachRasterizer())->unref();
556 p.setXfermodeMode(SkXfermode::kClear_Mode);
557 rastBuilder->addLayer(p);
558 }
559
560 #include "Sk2DPathEffect.h"
561
MakeDotEffect(SkScalar radius,const SkMatrix & matrix)562 static SkPathEffect* MakeDotEffect(SkScalar radius, const SkMatrix& matrix) {
563 SkPath path;
564 path.addCircle(0, 0, radius);
565 return SkPath2DPathEffect::Create(matrix, path);
566 }
567
r7(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)568 static void r7(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
569 {
570 SkMatrix lattice;
571 lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
572 lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
573 p.setPathEffect(MakeDotEffect(SK_Scalar1*4, lattice))->unref();
574 rastBuilder->addLayer(p);
575 }
576
r8(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)577 static void r8(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
578 {
579 rastBuilder->addLayer(p);
580
581 SkMatrix lattice;
582 lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
583 lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
584 p.setPathEffect(MakeDotEffect(SK_Scalar1*2, lattice))->unref();
585 p.setXfermodeMode(SkXfermode::kClear_Mode);
586 rastBuilder->addLayer(p);
587
588 p.setPathEffect(nullptr);
589 p.setXfermode(nullptr);
590 p.setStyle(SkPaint::kStroke_Style);
591 p.setStrokeWidth(SK_Scalar1);
592 rastBuilder->addLayer(p);
593 }
594
r9(SkLayerRasterizer::Builder * rastBuilder,SkPaint & p)595 static void r9(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p)
596 {
597 rastBuilder->addLayer(p);
598
599 SkMatrix lattice;
600 lattice.setScale(SK_Scalar1, SK_Scalar1*6, 0, 0);
601 lattice.postRotate(SkIntToScalar(30), 0, 0);
602 p.setPathEffect(SkLine2DPathEffect::Create(SK_Scalar1*2, lattice))->unref();
603 p.setXfermodeMode(SkXfermode::kClear_Mode);
604 rastBuilder->addLayer(p);
605
606 p.setPathEffect(nullptr);
607 p.setXfermode(nullptr);
608 p.setStyle(SkPaint::kStroke_Style);
609 p.setStrokeWidth(SK_Scalar1);
610 rastBuilder->addLayer(p);
611 }
612
613 typedef void (*raster_proc)(SkLayerRasterizer::Builder*, SkPaint&);
614
615 static const raster_proc gRastProcs[] = {
616 r0, r1, r2, r3, r4, r5, r6, r7, r8, r9
617 };
618
apply_shader(SkPaint * paint,int index)619 static void apply_shader(SkPaint* paint, int index) {
620 raster_proc proc = gRastProcs[index];
621 SkPaint p;
622 SkLayerRasterizer::Builder rastBuilder;
623
624 p.setAntiAlias(true);
625 proc(&rastBuilder, p);
626 paint->setRasterizer(rastBuilder.detachRasterizer())->unref();
627 paint->setColor(SK_ColorBLUE);
628 }
629
630 #include "SkTypeface.h"
631
texteffect_slide(SkCanvas * canvas)632 static void texteffect_slide(SkCanvas* canvas) {
633 const char* str = "Google";
634 size_t len = strlen(str);
635 SkScalar x = 20;
636 SkScalar y = 80;
637 SkPaint paint;
638 paint.setTypeface(SkTypeface::CreateFromName("Georgia", SkTypeface::kItalic));
639 paint.setTextSize(75);
640 paint.setAntiAlias(true);
641 paint.setColor(SK_ColorBLUE);
642 for (size_t i = 0; i < SK_ARRAY_COUNT(gRastProcs); i++) {
643 apply_shader(&paint, (int)i);
644 canvas->drawText(str, len, x, y, paint);
645 y += 80;
646 if (i == 4) {
647 x += 320;
648 y = 80;
649 }
650 }
651 }
652
653 ///////////////////////////////////////////////////////////////////////////////
654
655 #include "SkImageEncoder.h"
656
657 static const SlideProc gProc[] = {
658 patheffect_slide,
659 gradient_slide,
660 textonpath_slide,
661 mesh_slide,
662 texteffect_slide
663 };
664
665 class SlideView : public SampleView {
666 int fIndex;
667 bool fOnce;
668 public:
SlideView()669 SlideView() {
670 fOnce = false;
671 }
672
init()673 void init() {
674 if (fOnce) {
675 return;
676 }
677 fOnce = true;
678
679 fIndex = 0;
680
681 SkBitmap bm;
682 bm.allocN32Pixels(1024, 768);
683 SkCanvas canvas(bm);
684 SkScalar s = SkIntToScalar(1024) / 640;
685 canvas.scale(s, s);
686 for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); i++) {
687 canvas.save();
688 canvas.drawColor(BG_COLOR);
689 gProc[i](&canvas);
690 canvas.restore();
691 SkString str;
692 str.printf("/skimages/slide_" SK_SIZE_T_SPECIFIER ".png", i);
693 SkImageEncoder::EncodeFile(str.c_str(), bm, SkImageEncoder::kPNG_Type, 100);
694 }
695 this->setBGColor(BG_COLOR);
696 }
697
698 protected:
699 // overrides from SkEventSink
onQuery(SkEvent * evt)700 bool onQuery(SkEvent* evt) override {
701 if (SampleCode::TitleQ(*evt)) {
702 SampleCode::TitleR(evt, "Slides");
703 return true;
704 }
705 return this->INHERITED::onQuery(evt);
706 }
707
onDrawContent(SkCanvas * canvas)708 void onDrawContent(SkCanvas* canvas) override {
709 this->init();
710 gProc[fIndex](canvas);
711 }
712
onFindClickHandler(SkScalar x,SkScalar y,unsigned)713 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
714 this->init();
715 fIndex = (fIndex + 1) % SK_ARRAY_COUNT(gProc);
716 this->inval(nullptr);
717 return nullptr;
718 }
719
720 private:
721 typedef SampleView INHERITED;
722 };
723
724 //////////////////////////////////////////////////////////////////////////////
725
MyFactory()726 static SkView* MyFactory() { return new SlideView; }
727 static SkViewRegister reg(MyFactory);
728
