1 /*
2 * Copyright 2016 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 "sk_tool_utils.h"
10 #include "SkBlurMaskFilter.h"
11 #include "SkRRect.h"
12
offset_center_to(const SkIRect & src,SkScalar x,SkScalar y)13 static SkRect offset_center_to(const SkIRect& src, SkScalar x, SkScalar y) {
14 SkScalar halfW = 0.5f * src.width();
15 SkScalar halfH = 0.5f * src.height();
16
17 return SkRect::MakeLTRB(x - halfW, y - halfH, x + halfW, y + halfH);
18 }
19
draw_rrect(SkCanvas * canvas,const SkRRect & rr,const SkRRect & occRR)20 static void draw_rrect(SkCanvas* canvas, const SkRRect& rr, const SkRRect& occRR) {
21 const SkScalar kBlurSigma = 5.0f;
22
23 SkRect occRect;
24 SkColor strokeColor;
25
26 {
27 SkRect occRect1 = sk_tool_utils::compute_central_occluder(occRR);
28 SkRect occRect2 = sk_tool_utils::compute_widest_occluder(occRR);
29 SkRect occRect3 = sk_tool_utils::compute_tallest_occluder(occRR);
30
31 SkScalar area1 = occRect1.width() * occRect1.height();
32 SkScalar area2 = occRect2.width() * occRect2.height();
33 SkScalar area3 = occRect3.width() * occRect3.height();
34
35 if (area1 >= area2 && area1 >= area3) {
36 strokeColor = SK_ColorRED;
37 occRect = occRect1;
38 } else if (area2 > area3) {
39 strokeColor = SK_ColorYELLOW;
40 occRect = occRect2;
41 } else {
42 strokeColor = SK_ColorCYAN;
43 occRect = occRect3;
44 }
45 }
46
47 // draw the blur
48 SkPaint paint;
49 paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, kBlurSigma, occRect));
50 canvas->drawRRect(rr, paint);
51
52 // draw the stroked geometry of the full occluder
53 SkPaint stroke;
54 stroke.setStyle(SkPaint::kStroke_Style);
55 stroke.setColor(SK_ColorBLUE);
56 canvas->drawRRect(occRR, stroke);
57
58 // draw the geometry of the occluding rect
59 stroke.setColor(strokeColor);
60 canvas->drawRect(occRect, stroke);
61 }
62
draw_45(SkCanvas * canvas,SkRRect::Corner corner,SkScalar dist,const SkPoint & center)63 static void draw_45(SkCanvas* canvas, SkRRect::Corner corner,
64 SkScalar dist, const SkPoint& center) {
65 SkRRect::Corner left = SkRRect::kUpperLeft_Corner, right = SkRRect::kUpperLeft_Corner;
66 SkVector dir = { 0, 0 };
67
68 constexpr SkScalar kSize = 64.0f / SK_ScalarSqrt2;
69
70 switch (corner) {
71 case SkRRect::kUpperLeft_Corner:
72 left = SkRRect::kUpperRight_Corner;
73 right = SkRRect::kLowerLeft_Corner;
74
75 dir.set(-SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2);
76 break;
77 case SkRRect::kUpperRight_Corner:
78 left = SkRRect::kUpperLeft_Corner;
79 right = SkRRect::kLowerRight_Corner;
80 dir.set(SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2);
81 break;
82 case SkRRect::kLowerRight_Corner:
83 left = SkRRect::kLowerLeft_Corner;
84 right = SkRRect::kUpperRight_Corner;
85 dir.set(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2);
86 break;
87 case SkRRect::kLowerLeft_Corner:
88 left = SkRRect::kLowerRight_Corner;
89 right = SkRRect::kUpperLeft_Corner;
90 dir.set(-SK_ScalarRoot2Over2, SK_ScalarRoot2Over2);
91 break;
92 default:
93 SK_ABORT("Invalid shape.");
94 }
95
96 SkRect r = SkRect::MakeWH(kSize, kSize);
97 // UL, UR, LR, LL
98 SkVector radii[4] = { { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f } };
99 radii[left] = SkVector::Make(kSize, kSize);
100 radii[right] = SkVector::Make(kSize, kSize);
101 SkRRect rr;
102 rr.setRectRadii(
103 offset_center_to(r.roundOut(), center.fX + dist*dir.fX, center.fY + dist*dir.fY),
104 radii);
105
106 SkRRect occRR;
107 dist -= 10.0f;
108 occRR.setRectRadii(
109 offset_center_to(r.roundOut(), center.fX + dist*dir.fX, center.fY + dist*dir.fY),
110 radii);
111
112 draw_rrect(canvas, rr, occRR);
113 }
114
draw_45_simple(SkCanvas * canvas,const SkVector & v,SkScalar dist,const SkPoint & center)115 static void draw_45_simple(SkCanvas* canvas, const SkVector& v,
116 SkScalar dist, const SkPoint& center) {
117 SkIRect r = SkIRect::MakeWH(64, 64);
118 SkRRect rr = SkRRect::MakeRectXY(
119 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
120 8, 8);
121
122 dist -= 10.0f;
123 SkRRect occRR = SkRRect::MakeRectXY(
124 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
125 8, 8);
126
127 draw_rrect(canvas, rr, occRR);
128 }
129
draw_90(SkCanvas * canvas,const SkVector & v,SkScalar dist,const SkPoint & center)130 static void draw_90(SkCanvas* canvas, const SkVector& v, SkScalar dist, const SkPoint& center) {
131 constexpr int kWidth = 25;
132
133 SkIRect r;
134 if (fabs(v.fX) < fabs(v.fY)) {
135 r = SkIRect::MakeWH(kWidth, 64);
136 } else {
137 r = SkIRect::MakeWH(64, kWidth);
138 }
139 SkRRect rr = SkRRect::MakeOval(
140 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY));
141
142 dist -= 10.0f;
143 SkRRect occRR = SkRRect::MakeOval(
144 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY));
145
146 draw_rrect(canvas, rr, occRR);
147 }
148
draw_90_simple(SkCanvas * canvas,const SkVector & v,SkScalar dist,const SkPoint & center)149 static void draw_90_simple(SkCanvas* canvas, const SkVector& v,
150 SkScalar dist, const SkPoint& center) {
151 constexpr int kLength = 128;
152 // The width needs to be larger than 2*3*blurRadii+2*cornerRadius for the analytic
153 // RRect blur to kick in
154 constexpr int kWidth = 47;
155
156 SkIRect r;
157 if (fabs(v.fX) < fabs(v.fY)) {
158 r = SkIRect::MakeWH(kLength, kWidth);
159 } else {
160 r = SkIRect::MakeWH(kWidth, kLength);
161 }
162 SkRRect rr = SkRRect::MakeRectXY(
163 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
164 8, 8);
165
166 dist -= 10.0f;
167 SkRRect occRR = SkRRect::MakeRectXY(
168 offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY),
169 8, 8);
170
171 draw_rrect(canvas, rr, occRR);
172 }
173
draw_30_60(SkCanvas * canvas,SkRRect::Corner corner,const SkVector & v,SkScalar dist,const SkPoint & center)174 static void draw_30_60(SkCanvas* canvas, SkRRect::Corner corner, const SkVector& v,
175 SkScalar dist, const SkPoint& center) {
176 SkRRect::Corner left = SkRRect::kUpperLeft_Corner, right = SkRRect::kUpperLeft_Corner;
177
178 constexpr int kLength = 64;
179 constexpr int kWidth = 30;
180
181 switch (corner) {
182 case SkRRect::kUpperLeft_Corner:
183 left = SkRRect::kUpperRight_Corner;
184 right = SkRRect::kLowerLeft_Corner;
185 break;
186 case SkRRect::kUpperRight_Corner:
187 left = SkRRect::kUpperLeft_Corner;
188 right = SkRRect::kLowerRight_Corner;
189 break;
190 case SkRRect::kLowerRight_Corner:
191 left = SkRRect::kLowerLeft_Corner;
192 right = SkRRect::kUpperRight_Corner;
193 break;
194 case SkRRect::kLowerLeft_Corner:
195 left = SkRRect::kLowerRight_Corner;
196 right = SkRRect::kUpperLeft_Corner;
197 break;
198 default:
199 SK_ABORT("Invalid shape.");
200 }
201
202 SkIRect r;
203 if (fabs(v.fX) < fabs(v.fY)) {
204 r = SkIRect::MakeWH(kLength, kWidth);
205 } else {
206 r = SkIRect::MakeWH(kWidth, kLength);
207 }
208 // UL, UR, LR, LL
209 SkVector radii[4] = { { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f }, { 0.0f, 0.0f } };
210 radii[left] = SkVector::Make(SkIntToScalar(kWidth), SkIntToScalar(kWidth));
211 radii[right] = SkVector::Make(SkIntToScalar(kWidth), SkIntToScalar(kWidth));
212 SkRRect rr;
213 rr.setRectRadii(offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY), radii);
214
215 dist -= 10.0f;
216 SkRRect occRR;
217 occRR.setRectRadii(offset_center_to(r, center.fX + dist*v.fX, center.fY + dist*v.fY), radii);
218 draw_rrect(canvas, rr, occRR);
219 }
220
221 namespace skiagm {
222
223 class OccludedRRectBlurGM : public GM {
224 public:
OccludedRRectBlurGM()225 OccludedRRectBlurGM() {
226 this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
227 }
228
229 protected:
230
onShortName()231 SkString onShortName() override {
232 return SkString("occludedrrectblur");
233 }
234
onISize()235 SkISize onISize() override {
236 return SkISize::Make(kWidth, kHeight);
237 }
238
onDraw(SkCanvas * canvas)239 void onDraw(SkCanvas* canvas) override {
240 const SkPoint center = SkPoint::Make(kWidth/2, kHeight/2);
241
242 // outer-most big RR
243 {
244 SkIRect r = SkIRect::MakeWH(420, 420);
245 SkRRect rr = SkRRect::MakeRectXY(offset_center_to(r, center.fX, center.fY), 64, 64);
246 draw_rrect(canvas, rr, rr);
247
248 #if 1
249 // TODO: remove this. Until we actually start skipping the middle draw we need this
250 // to provide contrast
251 SkPaint temp;
252 temp.setColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
253 r.inset(32, 32);
254 canvas->drawRect(offset_center_to(r, center.fX, center.fY), temp);
255 #endif
256 }
257
258 // center circle
259 {
260 SkIRect r = SkIRect::MakeWH(32, 32);
261 SkRRect rr = SkRRect::MakeOval(offset_center_to(r, center.fX, center.fY));
262 draw_rrect(canvas, rr, rr);
263 }
264
265 draw_45(canvas, SkRRect::kUpperLeft_Corner, 64, center);
266 draw_45(canvas, SkRRect::kUpperRight_Corner, 64, center);
267 draw_45(canvas, SkRRect::kLowerRight_Corner, 64, center);
268 draw_45(canvas, SkRRect::kLowerLeft_Corner, 64, center);
269
270 draw_90(canvas, SkVector::Make(-1.0f, 0.0f), 64, center);
271 draw_90(canvas, SkVector::Make(0.0f, -1.0f), 64, center);
272 draw_90(canvas, SkVector::Make(1.0f, 0.0f), 64, center);
273 draw_90(canvas, SkVector::Make(0.0f, 1.0f), 64, center);
274
275 constexpr SkScalar kRoot3Over2 = 0.8660254037844386f;
276
277 draw_30_60(canvas, SkRRect::kLowerLeft_Corner,
278 SkVector::Make(0.5f, kRoot3Over2), 120, center);
279 draw_30_60(canvas, SkRRect::kUpperRight_Corner,
280 SkVector::Make(kRoot3Over2, 0.5f), 120, center);
281
282 draw_30_60(canvas, SkRRect::kUpperLeft_Corner,
283 SkVector::Make(-0.5f, kRoot3Over2), 120, center);
284 draw_30_60(canvas, SkRRect::kLowerRight_Corner,
285 SkVector::Make(-kRoot3Over2, 0.5f), 120, center);
286
287 draw_30_60(canvas, SkRRect::kLowerLeft_Corner,
288 SkVector::Make(-0.5f, -kRoot3Over2), 120, center);
289 draw_30_60(canvas, SkRRect::kUpperRight_Corner,
290 SkVector::Make(-kRoot3Over2, -0.5f), 120, center);
291
292 draw_30_60(canvas, SkRRect::kUpperLeft_Corner,
293 SkVector::Make(0.5f, -kRoot3Over2), 120, center);
294 draw_30_60(canvas, SkRRect::kLowerRight_Corner,
295 SkVector::Make(kRoot3Over2, -0.5f), 120, center);
296
297 draw_45_simple(canvas, SkVector::Make(-SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2),
298 210, center);
299 draw_45_simple(canvas, SkVector::Make(SK_ScalarRoot2Over2, -SK_ScalarRoot2Over2),
300 210, center);
301 draw_45_simple(canvas, SkVector::Make(SK_ScalarRoot2Over2, SK_ScalarRoot2Over2),
302 210, center);
303 draw_45_simple(canvas, SkVector::Make(-SK_ScalarRoot2Over2, SK_ScalarRoot2Over2),
304 210, center);
305
306 draw_90_simple(canvas, SkVector::Make(-1.0f, 0.0f), 160, center);
307 draw_90_simple(canvas, SkVector::Make(0.0f, -1.0f), 160, center);
308 draw_90_simple(canvas, SkVector::Make(1.0f, 0.0f), 160, center);
309 draw_90_simple(canvas, SkVector::Make(0.0f, 1.0f), 160, center);
310 }
311
312 private:
313 static constexpr int kWidth = 440;
314 static constexpr int kHeight = 440;
315
316 typedef GM INHERITED;
317 };
318
319 //////////////////////////////////////////////////////////////////////////////
320
321 DEF_GM(return new OccludedRRectBlurGM;)
322 }
323