Line data Source code
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 "GrGLPath.h"
9 : #include "GrGLPathRendering.h"
10 : #include "GrGLGpu.h"
11 : #include "GrStyle.h"
12 :
13 : namespace {
14 0 : inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) {
15 : static const GrGLubyte gTable[] = {
16 : GR_GL_MOVE_TO,
17 : GR_GL_LINE_TO,
18 : GR_GL_QUADRATIC_CURVE_TO,
19 : GR_GL_CONIC_CURVE_TO,
20 : GR_GL_CUBIC_CURVE_TO,
21 : GR_GL_CLOSE_PATH,
22 : };
23 : GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
24 : GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
25 : GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
26 : GR_STATIC_ASSERT(3 == SkPath::kConic_Verb);
27 : GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
28 : GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
29 :
30 0 : SkASSERT(verb >= 0 && (size_t)verb < SK_ARRAY_COUNT(gTable));
31 0 : return gTable[verb];
32 : }
33 :
34 : #ifdef SK_DEBUG
35 0 : inline int num_coords(SkPath::Verb verb) {
36 : static const int gTable[] = {
37 : 2, // move
38 : 2, // line
39 : 4, // quad
40 : 5, // conic
41 : 6, // cubic
42 : 0, // close
43 : };
44 : GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
45 : GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
46 : GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
47 : GR_STATIC_ASSERT(3 == SkPath::kConic_Verb);
48 : GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
49 : GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
50 :
51 0 : SkASSERT(verb >= 0 && (size_t)verb < SK_ARRAY_COUNT(gTable));
52 0 : return gTable[verb];
53 : }
54 : #endif
55 :
56 0 : inline GrGLenum join_to_gl_join(SkPaint::Join join) {
57 : static GrGLenum gSkJoinsToGrGLJoins[] = {
58 : GR_GL_MITER_REVERT,
59 : GR_GL_ROUND,
60 : GR_GL_BEVEL
61 : };
62 0 : return gSkJoinsToGrGLJoins[join];
63 : GR_STATIC_ASSERT(0 == SkPaint::kMiter_Join);
64 : GR_STATIC_ASSERT(1 == SkPaint::kRound_Join);
65 : GR_STATIC_ASSERT(2 == SkPaint::kBevel_Join);
66 : GR_STATIC_ASSERT(SK_ARRAY_COUNT(gSkJoinsToGrGLJoins) == SkPaint::kJoinCount);
67 : }
68 :
69 0 : inline GrGLenum cap_to_gl_cap(SkPaint::Cap cap) {
70 : static GrGLenum gSkCapsToGrGLCaps[] = {
71 : GR_GL_FLAT,
72 : GR_GL_ROUND,
73 : GR_GL_SQUARE
74 : };
75 0 : return gSkCapsToGrGLCaps[cap];
76 : GR_STATIC_ASSERT(0 == SkPaint::kButt_Cap);
77 : GR_STATIC_ASSERT(1 == SkPaint::kRound_Cap);
78 : GR_STATIC_ASSERT(2 == SkPaint::kSquare_Cap);
79 : GR_STATIC_ASSERT(SK_ARRAY_COUNT(gSkCapsToGrGLCaps) == SkPaint::kCapCount);
80 : }
81 :
82 : #ifdef SK_DEBUG
83 0 : inline void verify_floats(const float* floats, int count) {
84 0 : for (int i = 0; i < count; ++i) {
85 0 : SkASSERT(!SkScalarIsNaN(SkFloatToScalar(floats[i])));
86 : }
87 0 : }
88 : #endif
89 :
90 0 : inline void points_to_coords(const SkPoint points[], size_t first_point, size_t amount,
91 : GrGLfloat coords[]) {
92 0 : for (size_t i = 0; i < amount; ++i) {
93 0 : coords[i * 2] = SkScalarToFloat(points[first_point + i].fX);
94 0 : coords[i * 2 + 1] = SkScalarToFloat(points[first_point + i].fY);
95 : }
96 0 : }
97 :
98 : template<bool checkForDegenerates>
99 0 : inline bool init_path_object_for_general_path(GrGLGpu* gpu, GrGLuint pathID,
100 : const SkPath& skPath) {
101 0 : SkDEBUGCODE(int numCoords = 0);
102 0 : int verbCnt = skPath.countVerbs();
103 0 : int pointCnt = skPath.countPoints();
104 0 : int minCoordCnt = pointCnt * 2;
105 :
106 0 : SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt);
107 0 : SkSTArray<16, GrGLfloat, true> pathCoords(minCoordCnt);
108 0 : bool lastVerbWasMove = true; // A path with just "close;" means "moveto(0,0); close;"
109 : SkPoint points[4];
110 0 : SkPath::RawIter iter(skPath);
111 : SkPath::Verb verb;
112 0 : while ((verb = iter.next(points)) != SkPath::kDone_Verb) {
113 0 : pathCommands.push_back(verb_to_gl_path_cmd(verb));
114 : GrGLfloat coords[6];
115 : int coordsForVerb;
116 0 : switch (verb) {
117 : case SkPath::kMove_Verb:
118 : if (checkForDegenerates) {
119 0 : lastVerbWasMove = true;
120 : }
121 0 : points_to_coords(points, 0, 1, coords);
122 0 : coordsForVerb = 2;
123 0 : break;
124 : case SkPath::kLine_Verb:
125 : if (checkForDegenerates) {
126 0 : if (SkPath::IsLineDegenerate(points[0], points[1], true)) {
127 0 : return false;
128 : }
129 0 : lastVerbWasMove = false;
130 : }
131 :
132 0 : points_to_coords(points, 1, 1, coords);
133 0 : coordsForVerb = 2;
134 0 : break;
135 : case SkPath::kConic_Verb:
136 : if (checkForDegenerates) {
137 0 : if (SkPath::IsQuadDegenerate(points[0], points[1], points[2], true)) {
138 0 : return false;
139 : }
140 0 : lastVerbWasMove = false;
141 : }
142 0 : points_to_coords(points, 1, 2, coords);
143 0 : coords[4] = SkScalarToFloat(iter.conicWeight());
144 0 : coordsForVerb = 5;
145 0 : break;
146 : case SkPath::kQuad_Verb:
147 : if (checkForDegenerates) {
148 0 : if (SkPath::IsQuadDegenerate(points[0], points[1], points[2], true)) {
149 0 : return false;
150 : }
151 0 : lastVerbWasMove = false;
152 : }
153 0 : points_to_coords(points, 1, 2, coords);
154 0 : coordsForVerb = 4;
155 0 : break;
156 : case SkPath::kCubic_Verb:
157 : if (checkForDegenerates) {
158 0 : if (SkPath::IsCubicDegenerate(points[0], points[1], points[2], points[3],
159 : true)) {
160 0 : return false;
161 : }
162 0 : lastVerbWasMove = false;
163 : }
164 0 : points_to_coords(points, 1, 3, coords);
165 0 : coordsForVerb = 6;
166 0 : break;
167 : case SkPath::kClose_Verb:
168 : if (checkForDegenerates) {
169 0 : if (lastVerbWasMove) {
170 : // Interpret "move(x,y);close;" as "move(x,y);lineto(x,y);close;".
171 : // which produces a degenerate segment.
172 0 : return false;
173 : }
174 : }
175 0 : continue;
176 : default:
177 0 : SkASSERT(false); // Not reached.
178 0 : continue;
179 : }
180 0 : SkDEBUGCODE(numCoords += num_coords(verb));
181 0 : SkDEBUGCODE(verify_floats(coords, coordsForVerb));
182 0 : pathCoords.push_back_n(coordsForVerb, coords);
183 : }
184 0 : SkASSERT(verbCnt == pathCommands.count());
185 0 : SkASSERT(numCoords == pathCoords.count());
186 :
187 0 : GR_GL_CALL(gpu->glInterface(),
188 : PathCommands(pathID, pathCommands.count(), pathCommands.begin(),
189 : pathCoords.count(), GR_GL_FLOAT, pathCoords.begin()));
190 0 : return true;
191 : }
192 :
193 : /*
194 : * For now paths only natively support winding and even odd fill types
195 : */
196 0 : static GrPathRendering::FillType convert_skpath_filltype(SkPath::FillType fill) {
197 0 : switch (fill) {
198 : default:
199 0 : SkFAIL("Incomplete Switch\n");
200 : case SkPath::kWinding_FillType:
201 : case SkPath::kInverseWinding_FillType:
202 0 : return GrPathRendering::kWinding_FillType;
203 : case SkPath::kEvenOdd_FillType:
204 : case SkPath::kInverseEvenOdd_FillType:
205 0 : return GrPathRendering::kEvenOdd_FillType;
206 : }
207 : }
208 :
209 : } // namespace
210 :
211 0 : bool GrGLPath::InitPathObjectPathDataCheckingDegenerates(GrGLGpu* gpu, GrGLuint pathID,
212 : const SkPath& skPath) {
213 0 : return init_path_object_for_general_path<true>(gpu, pathID, skPath);
214 : }
215 :
216 0 : void GrGLPath::InitPathObjectPathData(GrGLGpu* gpu,
217 : GrGLuint pathID,
218 : const SkPath& skPath) {
219 0 : SkASSERT(!skPath.isEmpty());
220 :
221 : #if 1 // SK_SCALAR_IS_FLOAT
222 : // This branch does type punning, converting SkPoint* to GrGLfloat*.
223 0 : if ((skPath.getSegmentMasks() & SkPath::kConic_SegmentMask) == 0) {
224 0 : int verbCnt = skPath.countVerbs();
225 0 : int pointCnt = skPath.countPoints();
226 0 : int coordCnt = pointCnt * 2;
227 0 : SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt);
228 0 : SkSTArray<16, GrGLfloat, true> pathCoords(coordCnt);
229 :
230 : static_assert(sizeof(SkPoint) == sizeof(GrGLfloat) * 2, "sk_point_not_two_floats");
231 :
232 0 : pathCommands.resize_back(verbCnt);
233 0 : pathCoords.resize_back(coordCnt);
234 0 : skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[0]), pointCnt);
235 0 : skPath.getVerbs(&pathCommands[0], verbCnt);
236 :
237 0 : SkDEBUGCODE(int verbCoordCnt = 0);
238 0 : for (int i = 0; i < verbCnt; ++i) {
239 0 : SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
240 0 : pathCommands[i] = verb_to_gl_path_cmd(v);
241 0 : SkDEBUGCODE(verbCoordCnt += num_coords(v));
242 : }
243 0 : SkASSERT(verbCnt == pathCommands.count());
244 0 : SkASSERT(verbCoordCnt == pathCoords.count());
245 0 : SkDEBUGCODE(verify_floats(&pathCoords[0], pathCoords.count()));
246 0 : GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, pathCommands.count(), &pathCommands[0],
247 : pathCoords.count(), GR_GL_FLOAT,
248 : &pathCoords[0]));
249 0 : return;
250 : }
251 : #endif
252 0 : SkAssertResult(init_path_object_for_general_path<false>(gpu, pathID, skPath));
253 : }
254 :
255 0 : void GrGLPath::InitPathObjectStroke(GrGLGpu* gpu, GrGLuint pathID, const SkStrokeRec& stroke) {
256 0 : SkASSERT(!stroke.isHairlineStyle());
257 0 : GR_GL_CALL(gpu->glInterface(),
258 : PathParameterf(pathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth())));
259 0 : GR_GL_CALL(gpu->glInterface(),
260 : PathParameterf(pathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter())));
261 0 : GrGLenum join = join_to_gl_join(stroke.getJoin());
262 0 : GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_JOIN_STYLE, join));
263 0 : GrGLenum cap = cap_to_gl_cap(stroke.getCap());
264 0 : GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_END_CAPS, cap));
265 0 : GR_GL_CALL(gpu->glInterface(), PathParameterf(pathID, GR_GL_PATH_STROKE_BOUND, 0.02f));
266 0 : }
267 :
268 0 : void GrGLPath::InitPathObjectEmptyPath(GrGLGpu* gpu, GrGLuint pathID) {
269 0 : GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, 0, nullptr, 0, GR_GL_FLOAT, nullptr));
270 0 : }
271 :
272 0 : GrGLPath::GrGLPath(GrGLGpu* gpu, const SkPath& origSkPath, const GrStyle& style)
273 : : INHERITED(gpu, origSkPath, style),
274 0 : fPathID(gpu->glPathRendering()->genPaths(1)) {
275 :
276 0 : if (origSkPath.isEmpty()) {
277 0 : InitPathObjectEmptyPath(gpu, fPathID);
278 0 : fShouldStroke = false;
279 0 : fShouldFill = false;
280 : } else {
281 0 : const SkPath* skPath = &origSkPath;
282 0 : SkTLazy<SkPath> tmpPath;
283 0 : SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle);
284 :
285 0 : if (style.pathEffect()) {
286 : // Skia stroking and NVPR stroking differ with respect to dashing
287 : // pattern.
288 : // Convert a dashing (or other path effect) to either a stroke or a fill.
289 0 : if (style.applyPathEffectToPath(tmpPath.init(), &stroke, *skPath, SK_Scalar1)) {
290 0 : skPath = tmpPath.get();
291 : }
292 : } else {
293 0 : stroke = style.strokeRec();
294 : }
295 :
296 0 : bool didInit = false;
297 0 : if (stroke.needToApply() && stroke.getCap() != SkPaint::kButt_Cap) {
298 : // Skia stroking and NVPR stroking differ with respect to stroking
299 : // end caps of empty subpaths.
300 : // Convert stroke to fill if path contains empty subpaths.
301 0 : didInit = InitPathObjectPathDataCheckingDegenerates(gpu, fPathID, *skPath);
302 0 : if (!didInit) {
303 0 : if (!tmpPath.isValid()) {
304 0 : tmpPath.init();
305 : }
306 0 : SkAssertResult(stroke.applyToPath(tmpPath.get(), *skPath));
307 0 : skPath = tmpPath.get();
308 0 : stroke.setFillStyle();
309 : }
310 : }
311 :
312 0 : if (!didInit) {
313 0 : InitPathObjectPathData(gpu, fPathID, *skPath);
314 : }
315 :
316 0 : fShouldStroke = stroke.needToApply();
317 0 : fShouldFill = stroke.isFillStyle() ||
318 0 : stroke.getStyle() == SkStrokeRec::kStrokeAndFill_Style;
319 :
320 0 : fFillType = convert_skpath_filltype(skPath->getFillType());
321 0 : fBounds = skPath->getBounds();
322 0 : SkScalar radius = stroke.getInflationRadius();
323 0 : fBounds.outset(radius, radius);
324 0 : if (fShouldStroke) {
325 0 : InitPathObjectStroke(gpu, fPathID, stroke);
326 : }
327 : }
328 :
329 0 : this->registerWithCache(SkBudgeted::kYes);
330 0 : }
331 :
332 0 : void GrGLPath::onRelease() {
333 0 : if (0 != fPathID) {
334 0 : static_cast<GrGLGpu*>(this->getGpu())->glPathRendering()->deletePaths(fPathID, 1);
335 0 : fPathID = 0;
336 : }
337 :
338 0 : INHERITED::onRelease();
339 0 : }
340 :
341 0 : void GrGLPath::onAbandon() {
342 0 : fPathID = 0;
343 :
344 0 : INHERITED::onAbandon();
345 0 : }
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