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 #include "include/core/SkCanvas.h"
8 #include "include/core/SkPaint.h"
9 #include "include/core/SkVertices.h"
10 #include "include/effects/SkBlurMaskFilter.h"
11 #include "include/effects/SkGradientShader.h"
12 #include "samplecode/Sample.h"
13 #include "src/core/SkBlurMask.h"
14 #include "src/core/SkReadBuffer.h"
15 #include "src/core/SkWriteBuffer.h"
16
17 #include "tools/ToolUtils.h"
18
19 #define BG_COLOR 0xFFDDDDDD
20
21 typedef void (*SlideProc)(SkCanvas*);
22
23 ///////////////////////////////////////////////////////////////////////////////
24
25 #include "include/effects/Sk1DPathEffect.h"
26 #include "include/effects/Sk2DPathEffect.h"
27 #include "include/effects/SkCornerPathEffect.h"
28 #include "include/effects/SkDashPathEffect.h"
29 #include "include/effects/SkDiscretePathEffect.h"
30
compose_pe(SkPaint * paint)31 static void compose_pe(SkPaint* paint) {
32 SkPathEffect* pe = paint->getPathEffect();
33 sk_sp<SkPathEffect> corner = SkCornerPathEffect::Make(25);
34 sk_sp<SkPathEffect> compose;
35 if (pe) {
36 compose = SkPathEffect::MakeCompose(sk_ref_sp(pe), corner);
37 } else {
38 compose = corner;
39 }
40 paint->setPathEffect(compose);
41 }
42
hair_pe(SkPaint * paint)43 static void hair_pe(SkPaint* paint) {
44 paint->setStrokeWidth(0);
45 }
46
hair2_pe(SkPaint * paint)47 static void hair2_pe(SkPaint* paint) {
48 paint->setStrokeWidth(0);
49 compose_pe(paint);
50 }
51
stroke_pe(SkPaint * paint)52 static void stroke_pe(SkPaint* paint) {
53 paint->setStrokeWidth(12);
54 compose_pe(paint);
55 }
56
dash_pe(SkPaint * paint)57 static void dash_pe(SkPaint* paint) {
58 SkScalar inter[] = { 20, 10, 10, 10 };
59 paint->setStrokeWidth(12);
60 paint->setPathEffect(SkDashPathEffect::Make(inter, SK_ARRAY_COUNT(inter), 0));
61 compose_pe(paint);
62 }
63
64 static const int gXY[] = {
65 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
66 };
67
scale(SkPath * path,SkScalar scale)68 static void scale(SkPath* path, SkScalar scale) {
69 SkMatrix m;
70 m.setScale(scale, scale);
71 path->transform(m);
72 }
73
one_d_pe(SkPaint * paint)74 static void one_d_pe(SkPaint* paint) {
75 SkPath path;
76 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
77 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
78 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
79 path.close();
80 path.offset(SkIntToScalar(-6), 0);
81 scale(&path, 1.5f);
82
83 paint->setPathEffect(SkPath1DPathEffect::Make(path, SkIntToScalar(21), 0,
84 SkPath1DPathEffect::kRotate_Style));
85 compose_pe(paint);
86 }
87
88 typedef void (*PE_Proc)(SkPaint*);
89 static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
90
fill_pe(SkPaint * paint)91 static void fill_pe(SkPaint* paint) {
92 paint->setStyle(SkPaint::kFill_Style);
93 paint->setPathEffect(nullptr);
94 }
95
discrete_pe(SkPaint * paint)96 static void discrete_pe(SkPaint* paint) {
97 paint->setPathEffect(SkDiscretePathEffect::Make(10, 4));
98 }
99
MakeTileEffect()100 static sk_sp<SkPathEffect> MakeTileEffect() {
101 SkMatrix m;
102 m.setScale(SkIntToScalar(12), SkIntToScalar(12));
103
104 SkPath path;
105 path.addCircle(0, 0, SkIntToScalar(5));
106
107 return SkPath2DPathEffect::Make(m, path);
108 }
109
tile_pe(SkPaint * paint)110 static void tile_pe(SkPaint* paint) {
111 paint->setPathEffect(MakeTileEffect());
112 }
113
114 static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
115
patheffect_slide(SkCanvas * canvas)116 static void patheffect_slide(SkCanvas* canvas) {
117 SkPaint paint;
118 paint.setAntiAlias(true);
119 paint.setStyle(SkPaint::kStroke_Style);
120
121 SkPath path;
122 path.moveTo(20, 20);
123 path.lineTo(70, 120);
124 path.lineTo(120, 30);
125 path.lineTo(170, 80);
126 path.lineTo(240, 50);
127
128 size_t i;
129 canvas->save();
130 for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
131 gPE[i](&paint);
132 canvas->drawPath(path, paint);
133 canvas->translate(0, 75);
134 }
135 canvas->restore();
136
137 path.reset();
138 SkRect r = { 0, 0, 250, 120 };
139 path.addOval(r, SkPath::kCW_Direction);
140 r.inset(50, 50);
141 path.addRect(r, SkPath::kCCW_Direction);
142
143 canvas->translate(320, 20);
144 for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
145 gPE2[i](&paint);
146 canvas->drawPath(path, paint);
147 canvas->translate(0, 160);
148 }
149 }
150
151 ///////////////////////////////////////////////////////////////////////////////
152
153 #include "include/effects/SkGradientShader.h"
154
155 struct GradData {
156 int fCount;
157 const SkColor* fColors;
158 const SkScalar* fPos;
159 };
160
161 static const SkColor gColors[] = {
162 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
163 };
164 static const SkScalar gPos0[] = { 0, SK_Scalar1 };
165 static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
166 static const SkScalar gPos2[] = {
167 0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
168 };
169
170 static const GradData gGradData[] = {
171 { 2, gColors, nullptr },
172 { 2, gColors, gPos0 },
173 { 2, gColors, gPos1 },
174 { 5, gColors, nullptr },
175 { 5, gColors, gPos2 }
176 };
177
MakeLinear(const SkPoint pts[2],const GradData & data,SkTileMode tm)178 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
179 return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
180 }
181
MakeRadial(const SkPoint pts[2],const GradData & data,SkTileMode tm)182 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
183 SkPoint center;
184 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
185 SkScalarAve(pts[0].fY, pts[1].fY));
186 return SkGradientShader::MakeRadial(center, center.fX, data.fColors,
187 data.fPos, data.fCount, tm);
188 }
189
MakeSweep(const SkPoint pts[2],const GradData & data,SkTileMode tm)190 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
191 SkPoint center;
192 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
193 SkScalarAve(pts[0].fY, pts[1].fY));
194 return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
195 }
196
Make2Conical(const SkPoint pts[2],const GradData & data,SkTileMode tm)197 static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, SkTileMode tm) {
198 SkPoint center0, center1;
199 center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
200 SkScalarAve(pts[0].fY, pts[1].fY));
201 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
202 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
203 return SkGradientShader::MakeTwoPointConical(center1, (pts[1].fX - pts[0].fX) / 7,
204 center0, (pts[1].fX - pts[0].fX) / 2,
205 data.fColors, data.fPos, data.fCount, tm);
206 }
207
208 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData&, SkTileMode);
209 static const GradMaker gGradMakers[] = {
210 MakeLinear, MakeRadial, MakeSweep, Make2Conical
211 };
212
gradient_slide(SkCanvas * canvas)213 static void gradient_slide(SkCanvas* canvas) {
214 SkPoint pts[2] = {
215 { 0, 0 },
216 { SkIntToScalar(100), SkIntToScalar(100) }
217 };
218 SkTileMode tm = SkTileMode::kClamp;
219 SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
220 SkPaint paint;
221 paint.setAntiAlias(true);
222 paint.setDither(true);
223
224 canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
225 for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
226 canvas->save();
227 for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
228 paint.setShader(gGradMakers[j](pts, gGradData[i], tm));
229 canvas->drawRect(r, paint);
230 canvas->translate(0, SkIntToScalar(120));
231 }
232 canvas->restore();
233 canvas->translate(SkIntToScalar(120), 0);
234 }
235 }
236
237 ///////////////////////////////////////////////////////////////////////////////
238
239 #include "include/core/SkStream.h"
240 #include "include/utils/SkRandom.h"
241 #include "samplecode/DecodeFile.h"
242 #include "src/core/SkOSFile.h"
243
make_shader0(SkIPoint * size)244 static sk_sp<SkShader> make_shader0(SkIPoint* size) {
245 SkBitmap bm;
246
247 decode_file("/skimages/logo.gif", &bm);
248 size->set(bm.width(), bm.height());
249 return bm.makeShader();
250 }
251
make_shader1(const SkIPoint & size)252 static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
253 SkPoint pts[] = { { 0, 0 },
254 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
255 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
256 return SkGradientShader::MakeLinear(pts, colors, nullptr,
257 SK_ARRAY_COUNT(colors), SkTileMode::kMirror);
258 }
259
260 class Rec {
261 public:
262 SkVertices::VertexMode fMode;
263 int fCount;
264 SkPoint* fVerts;
265 SkPoint* fTexs;
266
Rec()267 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
~Rec()268 ~Rec() { delete[] fVerts; delete[] fTexs; }
269 };
270
make_tris(Rec * rec)271 static void make_tris(Rec* rec) {
272 int n = 10;
273 SkRandom rand;
274
275 rec->fMode = SkVertices::kTriangles_VertexMode;
276 rec->fCount = n * 3;
277 rec->fVerts = new SkPoint[rec->fCount];
278
279 for (int i = 0; i < n; i++) {
280 SkPoint* v = &rec->fVerts[i*3];
281 for (int j = 0; j < 3; j++) {
282 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
283 }
284 }
285 }
286
make_fan(Rec * rec,int texWidth,int texHeight)287 static void make_fan(Rec* rec, int texWidth, int texHeight) {
288 const SkScalar tx = SkIntToScalar(texWidth);
289 const SkScalar ty = SkIntToScalar(texHeight);
290 const int n = 24;
291
292 rec->fMode = SkVertices::kTriangleFan_VertexMode;
293 rec->fCount = n + 2;
294 rec->fVerts = new SkPoint[rec->fCount];
295 rec->fTexs = new SkPoint[rec->fCount];
296
297 SkPoint* v = rec->fVerts;
298 SkPoint* t = rec->fTexs;
299
300 v[0].set(0, 0);
301 t[0].set(0, 0);
302 for (int i = 0; i < n; i++) {
303 SkScalar r = SK_ScalarPI * 2 * i / n,
304 sin = SkScalarSin(r),
305 cos = SkScalarCos(r);
306 v[i+1].set(cos, sin);
307 t[i+1].set(i*tx/n, ty);
308 }
309 v[n+1] = v[1];
310 t[n+1].set(tx, ty);
311
312 SkMatrix m;
313 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
314 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
315 m.mapPoints(v, rec->fCount);
316 }
317
make_strip(Rec * rec,int texWidth,int texHeight)318 static void make_strip(Rec* rec, int texWidth, int texHeight) {
319 const SkScalar tx = SkIntToScalar(texWidth);
320 const SkScalar ty = SkIntToScalar(texHeight);
321 const int n = 24;
322
323 rec->fMode = SkVertices::kTriangleStrip_VertexMode;
324 rec->fCount = 2 * (n + 1);
325 rec->fVerts = new SkPoint[rec->fCount];
326 rec->fTexs = new SkPoint[rec->fCount];
327
328 SkPoint* v = rec->fVerts;
329 SkPoint* t = rec->fTexs;
330
331 for (int i = 0; i < n; i++) {
332 SkScalar r = SK_ScalarPI * 2 * i / n,
333 sin = SkScalarSin(r),
334 cos = SkScalarCos(r);
335 v[i*2 + 0].set(cos/2, sin/2);
336 v[i*2 + 1].set(cos, sin);
337
338 t[i*2 + 0].set(tx * i / n, ty);
339 t[i*2 + 1].set(tx * i / n, 0);
340 }
341 v[2*n + 0] = v[0];
342 v[2*n + 1] = v[1];
343
344 t[2*n + 0].set(tx, ty);
345 t[2*n + 1].set(tx, 0);
346
347 SkMatrix m;
348 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
349 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
350 m.mapPoints(v, rec->fCount);
351 }
352
mesh_slide(SkCanvas * canvas)353 static void mesh_slide(SkCanvas* canvas) {
354 Rec fRecs[3];
355 SkIPoint size;
356
357 auto fShader0 = make_shader0(&size);
358 auto fShader1 = make_shader1(size);
359
360 make_strip(&fRecs[0], size.fX, size.fY);
361 make_fan(&fRecs[1], size.fX, size.fY);
362 make_tris(&fRecs[2]);
363
364 SkPaint paint;
365 paint.setDither(true);
366 paint.setFilterQuality(kLow_SkFilterQuality);
367
368 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
369 auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,
370 fRecs[i].fVerts, fRecs[i].fTexs, nullptr);
371 canvas->save();
372
373 paint.setShader(nullptr);
374 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
375
376 canvas->translate(SkIntToScalar(210), 0);
377
378 paint.setShader(fShader0);
379 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
380
381 canvas->translate(SkIntToScalar(210), 0);
382
383 paint.setShader(fShader1);
384 canvas->drawVertices(verts, SkBlendMode::kModulate, paint);
385 canvas->restore();
386
387 canvas->translate(0, SkIntToScalar(250));
388 }
389 }
390
391 ///////////////////////////////////////////////////////////////////////////////
392
393 #include "include/core/SkTypeface.h"
394
395 ///////////////////////////////////////////////////////////////////////////////
396
397 #include "include/core/SkImageEncoder.h"
398
399 static const SlideProc gProc[] = {
400 patheffect_slide,
401 gradient_slide,
402 mesh_slide,
403 };
404
405 class SlideView : public Sample {
406 int fIndex;
407 bool fOnce;
408 public:
SlideView()409 SlideView() {
410 fOnce = false;
411 }
412
init()413 void init() {
414 if (fOnce) {
415 return;
416 }
417 fOnce = true;
418
419 fIndex = 0;
420
421 SkBitmap bm;
422 bm.allocN32Pixels(1024, 768);
423 SkCanvas canvas(bm);
424 SkScalar s = SkIntToScalar(1024) / 640;
425 canvas.scale(s, s);
426 for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); i++) {
427 canvas.save();
428 canvas.drawColor(BG_COLOR);
429 gProc[i](&canvas);
430 canvas.restore();
431 SkString str;
432 str.printf("/skimages/slide_" SK_SIZE_T_SPECIFIER ".png", i);
433 ToolUtils::EncodeImageToFile(str.c_str(), bm, SkEncodedImageFormat::kPNG, 100);
434 }
435 this->setBGColor(BG_COLOR);
436 }
437
438 protected:
name()439 SkString name() override { return SkString("Slides"); }
440
onDrawContent(SkCanvas * canvas)441 void onDrawContent(SkCanvas* canvas) override {
442 this->init();
443 gProc[fIndex](canvas);
444 }
445
onFindClickHandler(SkScalar x,SkScalar y,ModifierKey)446 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
447 this->init();
448 fIndex = (fIndex + 1) % SK_ARRAY_COUNT(gProc);
449 return nullptr;
450 }
451
452 private:
453 typedef Sample INHERITED;
454 };
455
456 //////////////////////////////////////////////////////////////////////////////
457
458 DEF_SAMPLE( return new SlideView(); )
459
