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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkMatrix.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkPathBuilder.h"
13 #include "include/core/SkPathEffect.h"
14 #include "include/core/SkRect.h"
15 #include "include/core/SkRefCnt.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTypes.h"
20 #include "include/effects/Sk1DPathEffect.h"
21 #include "include/effects/Sk2DPathEffect.h"
22 #include "include/effects/SkCornerPathEffect.h"
23 #include "include/effects/SkDashPathEffect.h"
24 #include "include/effects/SkDiscretePathEffect.h"
25 #include "include/effects/SkOpPathEffect.h"
26 #include "include/pathops/SkPathOps.h"
27
28 #include <initializer_list>
29
30 namespace skiagm {
31
compose_pe(SkPaint * paint)32 static void compose_pe(SkPaint* paint) {
33 SkPathEffect* pe = paint->getPathEffect();
34 sk_sp<SkPathEffect> corner = SkCornerPathEffect::Make(25);
35 sk_sp<SkPathEffect> compose;
36 if (pe) {
37 compose = SkPathEffect::MakeCompose(sk_ref_sp(pe), corner);
38 } else {
39 compose = corner;
40 }
41 paint->setPathEffect(compose);
42 }
43
hair_pe(SkPaint * paint)44 static void hair_pe(SkPaint* paint) {
45 paint->setStrokeWidth(0);
46 }
47
hair2_pe(SkPaint * paint)48 static void hair2_pe(SkPaint* paint) {
49 paint->setStrokeWidth(0);
50 compose_pe(paint);
51 }
52
stroke_pe(SkPaint * paint)53 static void stroke_pe(SkPaint* paint) {
54 paint->setStrokeWidth(12);
55 compose_pe(paint);
56 }
57
dash_pe(SkPaint * paint)58 static void dash_pe(SkPaint* paint) {
59 SkScalar inter[] = { 20, 10, 10, 10 };
60 paint->setStrokeWidth(12);
61 paint->setPathEffect(SkDashPathEffect::Make(inter, SK_ARRAY_COUNT(inter), 0));
62 compose_pe(paint);
63 }
64
65 constexpr int gXY[] = {
66 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
67 };
68
scale(const SkPath & path,SkScalar scale)69 static SkPath scale(const SkPath& path, SkScalar scale) {
70 SkMatrix m;
71 m.setScale(scale, scale);
72 return path.makeTransform(m);
73 }
74
one_d_pe(SkPaint * paint)75 static void one_d_pe(SkPaint* paint) {
76 SkPathBuilder b;
77 b.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
78 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2) {
79 b.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
80 }
81 b.close().offset(SkIntToScalar(-6), 0);
82 SkPath path = scale(b.detach(), 1.5f);
83
84 paint->setPathEffect(SkPath1DPathEffect::Make(path, SkIntToScalar(21), 0,
85 SkPath1DPathEffect::kRotate_Style));
86 compose_pe(paint);
87 }
88
89 typedef void (*PE_Proc)(SkPaint*);
90 constexpr PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
91
fill_pe(SkPaint * paint)92 static void fill_pe(SkPaint* paint) {
93 paint->setStyle(SkPaint::kFill_Style);
94 paint->setPathEffect(nullptr);
95 }
96
discrete_pe(SkPaint * paint)97 static void discrete_pe(SkPaint* paint) {
98 paint->setPathEffect(SkDiscretePathEffect::Make(10, 4));
99 }
100
MakeTileEffect()101 static sk_sp<SkPathEffect> MakeTileEffect() {
102 SkMatrix m;
103 m.setScale(SkIntToScalar(12), SkIntToScalar(12));
104
105 return SkPath2DPathEffect::Make(m, SkPath::Circle(0,0,5));
106 }
107
tile_pe(SkPaint * paint)108 static void tile_pe(SkPaint* paint) {
109 paint->setPathEffect(MakeTileEffect());
110 }
111
112 constexpr PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
113
114 class PathEffectGM : public GM {
115 public:
PathEffectGM()116 PathEffectGM() {}
117
118 protected:
119
onShortName()120 SkString onShortName() override {
121 return SkString("patheffect");
122 }
123
onISize()124 SkISize onISize() override { return SkISize::Make(800, 600); }
125
onDraw(SkCanvas * canvas)126 void onDraw(SkCanvas* canvas) override {
127 SkPaint paint;
128 paint.setAntiAlias(true);
129 paint.setStyle(SkPaint::kStroke_Style);
130
131 SkPath path = SkPath::Polygon({
132 {20, 20},
133 {70, 120},
134 {120, 30},
135 {170, 80},
136 {240, 50},
137 }, false);
138
139 canvas->save();
140 for (size_t i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
141 gPE[i](&paint);
142 canvas->drawPath(path, paint);
143 canvas->translate(0, 75);
144 }
145 canvas->restore();
146
147 path.reset();
148 SkRect r = { 0, 0, 250, 120 };
149 path = SkPathBuilder().addOval(r, SkPathDirection::kCW)
150 .addRect(r.makeInset(50, 50), SkPathDirection::kCCW)
151 .detach();
152
153 canvas->translate(320, 20);
154 for (size_t i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
155 gPE2[i](&paint);
156 canvas->drawPath(path, paint);
157 canvas->translate(0, 160);
158 }
159
160 const SkIRect rect = SkIRect::MakeXYWH(20, 20, 60, 60);
161 for (size_t i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
162 SkPaint p;
163 p.setAntiAlias(true);
164 p.setStyle(SkPaint::kFill_Style);
165 gPE[i](&p);
166 canvas->drawIRect(rect, p);
167 canvas->translate(75, 0);
168 }
169 }
170
171 private:
172 using INHERITED = GM;
173 };
174
175 DEF_GM( return new PathEffectGM; )
176
177 } // namespace skiagm
178
179 //////////////////////////////////////////////////////////////////////////////
180
181 class ComboPathEfectsGM : public skiagm::GM {
182 public:
ComboPathEfectsGM()183 ComboPathEfectsGM() {}
184
185 protected:
186
onShortName()187 SkString onShortName() override {
188 return SkString("combo-patheffects");
189 }
190
onISize()191 SkISize onISize() override { return SkISize::Make(360, 630); }
192
onDraw(SkCanvas * canvas)193 void onDraw(SkCanvas* canvas) override {
194 SkPath path0 = SkPath::Circle(100, 100, 60),
195 path1 = SkPathBuilder().moveTo(20, 20)
196 .cubicTo(20, 180, 140, 0, 140, 140)
197 .detach();
198
199 sk_sp<SkPathEffect> effects[] = {
200 nullptr,
201 SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap, 0),
202 SkMergePathEffect::Make(nullptr,
203 SkStrokePathEffect::Make(20, SkPaint::kRound_Join,
204 SkPaint::kRound_Cap, 0),
205 kDifference_SkPathOp),
206 SkMergePathEffect::Make(SkMatrixPathEffect::MakeTranslate(50, 30),
207 SkStrokePathEffect::Make(20, SkPaint::kRound_Join,
208 SkPaint::kRound_Cap, 0),
209 kReverseDifference_SkPathOp),
210 };
211
212 SkPaint wireframe;
213 wireframe.setStyle(SkPaint::kStroke_Style);
214 wireframe.setAntiAlias(true);
215
216 SkPaint paint;
217 paint.setColor(0xFF8888FF);
218 paint.setAntiAlias(true);
219
220 for (const SkPath& path : { path0, path1 }) {
221 canvas->save();
222 for (const sk_sp<SkPathEffect>& pe : effects) {
223 paint.setPathEffect(pe);
224 canvas->drawPath(path, paint);
225 canvas->drawPath(path, wireframe);
226
227 canvas->translate(0, 150);
228 }
229 canvas->restore();
230 canvas->translate(180, 0);
231 }
232 }
233
234 private:
235 using INHERITED = GM;
236 };
237 DEF_GM(return new ComboPathEfectsGM;)
238
239 #include "include/effects/SkStrokeAndFillPathEffect.h"
240
241 // Test that we can replicate SkPaint::kStrokeAndFill_Style
242 // with a patheffect. We expect the 2nd and 3rd columns to draw the same.
243 DEF_SIMPLE_GM(stroke_and_fill_patheffect, canvas, 900, 450) {
244 const float kStrokeWidth = 20;
245
246 typedef SkPath (*Maker)();
247 const Maker makers[] = {
__anona5324ff60102() 248 []() { return SkPath::Oval({0, 0, 100, 100}, SkPathDirection::kCW); },
__anona5324ff60202() 249 []() { return SkPath::Oval({0, 0, 100, 100}, SkPathDirection::kCCW); },
__anona5324ff60302() 250 []() {
251 const SkPoint pts[] = {
252 {0, 0}, {100, 100}, {0, 100}, {100, 0},
253 };
254 return SkPath::Polygon(pts, SK_ARRAY_COUNT(pts), true);
255 },
256 };
257
258 const struct {
259 SkPaint::Style fStyle;
260 float fWidth;
261 bool fUsePE;
262 bool fExpectStrokeAndFill;
263 } rec[] = {
264 { SkPaint::kStroke_Style, 0, false, false },
265 { SkPaint::kFill_Style, 0, true, false },
266 { SkPaint::kStroke_Style, 0, true, false },
267 { SkPaint::kStrokeAndFill_Style, kStrokeWidth, false, true },
268 { SkPaint::kStroke_Style, kStrokeWidth, true, true },
269 { SkPaint::kStrokeAndFill_Style, kStrokeWidth, true, true },
270 };
271
272 SkPaint paint;
273 canvas->translate(20, 20);
274 for (auto maker : makers) {
275 const SkPath path = maker();
276 canvas->save();
277 for (const auto& r : rec) {
278 paint.setStyle(r.fStyle);
279 paint.setStrokeWidth(r.fWidth);
280 paint.setPathEffect(r.fUsePE ? SkStrokeAndFillPathEffect::Make() : nullptr);
281 paint.setColor(r.fExpectStrokeAndFill ? SK_ColorGRAY : SK_ColorBLACK);
282
283 canvas->drawPath(path, paint);
284 canvas->translate(150, 0);
285 }
286 canvas->restore();
287
288 canvas->translate(0, 150);
289 }
290 }
291