1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "VectorDrawableUtils.h"
#include "PathParser.h"
#include <math.h>
#include <utils/Log.h>
namespace android {
namespace uirenderer {
class PathResolver {
public:
float currentX = 0;
float currentY = 0;
float ctrlPointX = 0;
float ctrlPointY = 0;
float currentSegmentStartX = 0;
float currentSegmentStartY = 0;
void addCommand(SkPath* outPath, char previousCmd, char cmd, const std::vector<float>* points,
size_t start, size_t end);
};
bool VectorDrawableUtils::canMorph(const PathData& morphFrom, const PathData& morphTo) {
if (morphFrom.verbs.size() != morphTo.verbs.size()) {
return false;
}
for (unsigned int i = 0; i < morphFrom.verbs.size(); i++) {
if (morphFrom.verbs[i] != morphTo.verbs[i] ||
morphFrom.verbSizes[i] != morphTo.verbSizes[i]) {
return false;
}
}
return true;
}
bool VectorDrawableUtils::interpolatePathData(PathData* outData, const PathData& morphFrom,
const PathData& morphTo, float fraction) {
if (!canMorph(morphFrom, morphTo)) {
return false;
}
interpolatePaths(outData, morphFrom, morphTo, fraction);
return true;
}
/**
* Convert an array of PathVerb to Path.
*/
void VectorDrawableUtils::verbsToPath(SkPath* outPath, const PathData& data) {
PathResolver resolver;
char previousCommand = 'm';
size_t start = 0;
outPath->reset();
for (unsigned int i = 0; i < data.verbs.size(); i++) {
size_t verbSize = data.verbSizes[i];
resolver.addCommand(outPath, previousCommand, data.verbs[i], &data.points, start,
start + verbSize);
previousCommand = data.verbs[i];
start += verbSize;
}
}
/**
* The current PathVerb will be interpolated between the
* <code>nodeFrom</code> and <code>nodeTo</code> according to the
* <code>fraction</code>.
*
* @param nodeFrom The start value as a PathVerb.
* @param nodeTo The end value as a PathVerb
* @param fraction The fraction to interpolate.
*/
void VectorDrawableUtils::interpolatePaths(PathData* outData, const PathData& from,
const PathData& to, float fraction) {
outData->points.resize(from.points.size());
outData->verbSizes = from.verbSizes;
outData->verbs = from.verbs;
for (size_t i = 0; i < from.points.size(); i++) {
outData->points[i] = from.points[i] * (1 - fraction) + to.points[i] * fraction;
}
}
// Use the given verb, and points in the range [start, end) to insert a command into the SkPath.
void PathResolver::addCommand(SkPath* outPath, char previousCmd, char cmd,
const std::vector<float>* points, size_t start, size_t end) {
int incr = 2;
float reflectiveCtrlPointX;
float reflectiveCtrlPointY;
switch (cmd) {
case 'z':
case 'Z':
outPath->close();
// Path is closed here, but we need to move the pen to the
// closed position. So we cache the segment's starting position,
// and restore it here.
currentX = currentSegmentStartX;
currentY = currentSegmentStartY;
ctrlPointX = currentSegmentStartX;
ctrlPointY = currentSegmentStartY;
outPath->moveTo(currentX, currentY);
break;
case 'm':
case 'M':
case 'l':
case 'L':
case 't':
case 'T':
incr = 2;
break;
case 'h':
case 'H':
case 'v':
case 'V':
incr = 1;
break;
case 'c':
case 'C':
incr = 6;
break;
case 's':
case 'S':
case 'q':
case 'Q':
incr = 4;
break;
case 'a':
case 'A':
incr = 7;
break;
}
for (unsigned int k = start; k < end; k += incr) {
switch (cmd) {
case 'm': // moveto - Start a new sub-path (relative)
currentX += points->at(k + 0);
currentY += points->at(k + 1);
if (k > start) {
// According to the spec, if a moveto is followed by multiple
// pairs of coordinates, the subsequent pairs are treated as
// implicit lineto commands.
outPath->rLineTo(points->at(k + 0), points->at(k + 1));
} else {
outPath->rMoveTo(points->at(k + 0), points->at(k + 1));
currentSegmentStartX = currentX;
currentSegmentStartY = currentY;
}
break;
case 'M': // moveto - Start a new sub-path
currentX = points->at(k + 0);
currentY = points->at(k + 1);
if (k > start) {
// According to the spec, if a moveto is followed by multiple
// pairs of coordinates, the subsequent pairs are treated as
// implicit lineto commands.
outPath->lineTo(points->at(k + 0), points->at(k + 1));
} else {
outPath->moveTo(points->at(k + 0), points->at(k + 1));
currentSegmentStartX = currentX;
currentSegmentStartY = currentY;
}
break;
case 'l': // lineto - Draw a line from the current point (relative)
outPath->rLineTo(points->at(k + 0), points->at(k + 1));
currentX += points->at(k + 0);
currentY += points->at(k + 1);
break;
case 'L': // lineto - Draw a line from the current point
outPath->lineTo(points->at(k + 0), points->at(k + 1));
currentX = points->at(k + 0);
currentY = points->at(k + 1);
break;
case 'h': // horizontal lineto - Draws a horizontal line (relative)
outPath->rLineTo(points->at(k + 0), 0);
currentX += points->at(k + 0);
break;
case 'H': // horizontal lineto - Draws a horizontal line
outPath->lineTo(points->at(k + 0), currentY);
currentX = points->at(k + 0);
break;
case 'v': // vertical lineto - Draws a vertical line from the current point (r)
outPath->rLineTo(0, points->at(k + 0));
currentY += points->at(k + 0);
break;
case 'V': // vertical lineto - Draws a vertical line from the current point
outPath->lineTo(currentX, points->at(k + 0));
currentY = points->at(k + 0);
break;
case 'c': // curveto - Draws a cubic Bézier curve (relative)
outPath->rCubicTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
points->at(k + 3), points->at(k + 4), points->at(k + 5));
ctrlPointX = currentX + points->at(k + 2);
ctrlPointY = currentY + points->at(k + 3);
currentX += points->at(k + 4);
currentY += points->at(k + 5);
break;
case 'C': // curveto - Draws a cubic Bézier curve
outPath->cubicTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
points->at(k + 3), points->at(k + 4), points->at(k + 5));
currentX = points->at(k + 4);
currentY = points->at(k + 5);
ctrlPointX = points->at(k + 2);
ctrlPointY = points->at(k + 3);
break;
case 's': // smooth curveto - Draws a cubic Bézier curve (reflective cp)
reflectiveCtrlPointX = 0;
reflectiveCtrlPointY = 0;
if (previousCmd == 'c' || previousCmd == 's' || previousCmd == 'C' ||
previousCmd == 'S') {
reflectiveCtrlPointX = currentX - ctrlPointX;
reflectiveCtrlPointY = currentY - ctrlPointY;
}
outPath->rCubicTo(reflectiveCtrlPointX, reflectiveCtrlPointY, points->at(k + 0),
points->at(k + 1), points->at(k + 2), points->at(k + 3));
ctrlPointX = currentX + points->at(k + 0);
ctrlPointY = currentY + points->at(k + 1);
currentX += points->at(k + 2);
currentY += points->at(k + 3);
break;
case 'S': // shorthand/smooth curveto Draws a cubic Bézier curve(reflective cp)
reflectiveCtrlPointX = currentX;
reflectiveCtrlPointY = currentY;
if (previousCmd == 'c' || previousCmd == 's' || previousCmd == 'C' ||
previousCmd == 'S') {
reflectiveCtrlPointX = 2 * currentX - ctrlPointX;
reflectiveCtrlPointY = 2 * currentY - ctrlPointY;
}
outPath->cubicTo(reflectiveCtrlPointX, reflectiveCtrlPointY, points->at(k + 0),
points->at(k + 1), points->at(k + 2), points->at(k + 3));
ctrlPointX = points->at(k + 0);
ctrlPointY = points->at(k + 1);
currentX = points->at(k + 2);
currentY = points->at(k + 3);
break;
case 'q': // Draws a quadratic Bézier (relative)
outPath->rQuadTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
points->at(k + 3));
ctrlPointX = currentX + points->at(k + 0);
ctrlPointY = currentY + points->at(k + 1);
currentX += points->at(k + 2);
currentY += points->at(k + 3);
break;
case 'Q': // Draws a quadratic Bézier
outPath->quadTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
points->at(k + 3));
ctrlPointX = points->at(k + 0);
ctrlPointY = points->at(k + 1);
currentX = points->at(k + 2);
currentY = points->at(k + 3);
break;
case 't': // Draws a quadratic Bézier curve(reflective control point)(relative)
reflectiveCtrlPointX = 0;
reflectiveCtrlPointY = 0;
if (previousCmd == 'q' || previousCmd == 't' || previousCmd == 'Q' ||
previousCmd == 'T') {
reflectiveCtrlPointX = currentX - ctrlPointX;
reflectiveCtrlPointY = currentY - ctrlPointY;
}
outPath->rQuadTo(reflectiveCtrlPointX, reflectiveCtrlPointY, points->at(k + 0),
points->at(k + 1));
ctrlPointX = currentX + reflectiveCtrlPointX;
ctrlPointY = currentY + reflectiveCtrlPointY;
currentX += points->at(k + 0);
currentY += points->at(k + 1);
break;
case 'T': // Draws a quadratic Bézier curve (reflective control point)
reflectiveCtrlPointX = currentX;
reflectiveCtrlPointY = currentY;
if (previousCmd == 'q' || previousCmd == 't' || previousCmd == 'Q' ||
previousCmd == 'T') {
reflectiveCtrlPointX = 2 * currentX - ctrlPointX;
reflectiveCtrlPointY = 2 * currentY - ctrlPointY;
}
outPath->quadTo(reflectiveCtrlPointX, reflectiveCtrlPointY, points->at(k + 0),
points->at(k + 1));
ctrlPointX = reflectiveCtrlPointX;
ctrlPointY = reflectiveCtrlPointY;
currentX = points->at(k + 0);
currentY = points->at(k + 1);
break;
case 'a': // Draws an elliptical arc
// (rx ry x-axis-rotation large-arc-flag sweep-flag x y)
outPath->arcTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
(SkPath::ArcSize) (points->at(k + 3) != 0),
(SkPathDirection) (points->at(k + 4) == 0),
points->at(k + 5) + currentX, points->at(k + 6) + currentY);
currentX += points->at(k + 5);
currentY += points->at(k + 6);
ctrlPointX = currentX;
ctrlPointY = currentY;
break;
case 'A': // Draws an elliptical arc
outPath->arcTo(points->at(k + 0), points->at(k + 1), points->at(k + 2),
(SkPath::ArcSize) (points->at(k + 3) != 0),
(SkPathDirection) (points->at(k + 4) == 0),
points->at(k + 5), points->at(k + 6));
currentX = points->at(k + 5);
currentY = points->at(k + 6);
ctrlPointX = currentX;
ctrlPointY = currentY;
break;
default:
LOG_ALWAYS_FATAL("Unsupported command: %c", cmd);
break;
}
previousCmd = cmd;
}
}
} // namespace uirenderer
} // namespace android
|
