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