forked from pocketsvg/PocketSVG
-
Notifications
You must be signed in to change notification settings - Fork 0
/
SVGEngine.mm
executable file
·1040 lines (893 loc) · 38 KB
/
SVGEngine.mm
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
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* This file is part of the PocketSVG package.
* Copyright (c) Ponderwell, Ariel Elkin, Fjölnir Ásgeirsson, and Contributors
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import <libxml/xmlreader.h>
#import <vector>
#import "SVGEngine.h"
#import "SVGBezierPath.h"
static void __attribute__((__overloadable__)) _xmlFreePtr(char * const *p) { xmlFree(*p); }
#define xmlAutoFree __attribute__((__cleanup__(_xmlFreePtr)))
NSString * const kValidSVGCommands = @"CcMmLlHhVvZzQqTtAaSs";
struct svgParser {
svgParser(NSString *);
NSArray *parse(NSMapTable **aoAttributes);
protected:
NSString *_source;
NSMutableArray *_attributeStack;
xmlTextReaderPtr _xmlReader;
void pushGroup(NSDictionary *aGroupAttributes);
void popGroup();
CF_RETURNS_RETAINED CGPathRef readPathTag();
CF_RETURNS_RETAINED CGPathRef readPolylineTag();
CF_RETURNS_RETAINED CGPathRef readPolygonTag();
CF_RETURNS_RETAINED CGPathRef readRectTag();
CF_RETURNS_RETAINED CGPathRef readCircleTag();
CF_RETURNS_RETAINED CGPathRef readEllipseTag();
CF_RETURNS_RETAINED CGPathRef readLineTag();
NSDictionary *readAttributes();
float readFloatAttribute(NSString *aName);
bool hasAttribute(NSString * const aName);
NSString *readStringAttribute(NSString *aName);
private:
CF_RETURNS_RETAINED CGMutablePathRef _readPolylineTag();
};
struct pathDefinitionParser {
public:
pathDefinitionParser(NSString *);
CF_RETURNS_RETAINED CGMutablePathRef parse();
protected:
NSString *_definition;
CGMutablePathRef _path;
CGPoint _lastControlPoint;
unichar _cmd, _lastCmd;
std::vector<float> _operands;
void appendMoveTo();
void appendLineTo();
void appendCubicCurve();
void appendShorthandCubicCurve();
void appendQuadraticCurve();
void appendShorthandQuadraticCurve();
void appendArc();
};
struct hexTriplet {
hexTriplet(uint32_t bytes);
hexTriplet(NSString *str);
hexTriplet(CGColorRef color);
CGColorRef CGColor();
NSString *string();
protected:
uint32_t _data;
};
@interface SVGAttributeSet () {
@public
NSMapTable *_attributes;
}
@end
static NSMutableDictionary *_SVGParseStyle(NSString *body);
static NSString *_SVGFormatNumber(NSNumber *aNumber);
#pragma mark -
svgParser::svgParser(NSString *aSource)
{
NSCParameterAssert(aSource);
_source = aSource;
}
NSArray *svgParser::parse(NSMapTable ** const aoAttributes)
{
_xmlReader = xmlReaderForDoc((xmlChar *)[_source UTF8String], NULL, NULL, 0);
NSCAssert(_xmlReader, @"Failed to create XML parser");
if(aoAttributes)
*aoAttributes = [NSMapTable mapTableWithKeyOptions:NSMapTableStrongMemory|NSMapTableObjectPointerPersonality
valueOptions:NSMapTableStrongMemory];
NSMutableArray * const paths = [NSMutableArray new];
NSUInteger depthWithinUnknownElement = 0;
while(xmlTextReaderRead(_xmlReader) == 1) {
int const type = xmlTextReaderNodeType(_xmlReader);
const char * const tag = (char *)xmlTextReaderConstName(_xmlReader);
CGPathRef path = NULL;
if(depthWithinUnknownElement > 0) {
if(type == XML_READER_TYPE_ELEMENT && !xmlTextReaderIsEmptyElement(_xmlReader))
++depthWithinUnknownElement;
else if(type == XML_READER_TYPE_END_ELEMENT)
--depthWithinUnknownElement;
} else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "svg") == 0) {
// recognize the root svg element but we don't need to do anything with it
} else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "path") == 0)
path = readPathTag();
else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "polyline") == 0)
path = readPolylineTag();
else if (type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "line") == 0)
path = readLineTag();
else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "polygon") == 0)
path = readPolygonTag();
else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "rect") == 0)
path = readRectTag();
else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "circle") == 0)
path = readCircleTag();
else if(type == XML_READER_TYPE_ELEMENT && strcasecmp(tag, "ellipse") == 0)
path = readEllipseTag();
else if(strcasecmp(tag, "g") == 0 || strcasecmp(tag, "a") == 0) {
if(type == XML_READER_TYPE_ELEMENT)
pushGroup(readAttributes());
else if(type == XML_READER_TYPE_END_ELEMENT)
popGroup();
} else if(type == XML_READER_TYPE_ELEMENT && !xmlTextReaderIsEmptyElement(_xmlReader))
++depthWithinUnknownElement;
if(path) {
[paths addObject:CFBridgingRelease(path)];
if(aoAttributes) {
NSDictionary * const attributes = readAttributes();
if(attributes)
[*aoAttributes setObject:attributes forKey:(__bridge id)path];
}
}
}
xmlFreeTextReader(_xmlReader);
return paths;
}
void svgParser::pushGroup(NSDictionary *aGroupAttributes)
{
if(!_attributeStack)
_attributeStack = [NSMutableArray new];
[_attributeStack addObject:[_attributeStack.lastObject mutableCopy] ?: [NSMutableDictionary new]];
if(aGroupAttributes)
[_attributeStack.lastObject addEntriesFromDictionary:aGroupAttributes];
}
void svgParser::popGroup()
{
if([_attributeStack count] > 0)
[_attributeStack removeLastObject];
}
CF_RETURNS_RETAINED CGPathRef svgParser::readPathTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "path") == 0,
@"Not on a <path>");
xmlAutoFree char * const pathDef = (char *)xmlTextReaderGetAttribute(_xmlReader, (xmlChar*)"d");
if(!pathDef)
return NULL;
CGPathRef const path = pathDefinitionParser(@(pathDef)).parse();
if(!path) {
NSLog(@"*** Error: Invalid/missing d attribute in <path>");
return NULL;
} else
return path;
}
CF_RETURNS_RETAINED CGPathRef svgParser::readRectTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "rect") == 0,
@"Not on a <rect>");
CGRect const rect = {
readFloatAttribute(@"x"), readFloatAttribute(@"y"),
readFloatAttribute(@"width"), readFloatAttribute(@"height")
};
float rx = readFloatAttribute(@"rx");
float ry = readFloatAttribute(@"ry");
if (!hasAttribute(@"rx")) {
rx = ry;
}
if (!hasAttribute(@"ry")) {
ry = rx;
}
CGMutablePathRef rectPath = CGPathCreateMutable();
CGPathAddRoundedRect(rectPath, NULL, rect, MIN(rx, rect.size.width/2), MIN(ry, rect.size.height/2));
return rectPath;
}
// Reads <polyline> without validating tag, used for <polygon> also
CF_RETURNS_RETAINED CGMutablePathRef svgParser::_readPolylineTag()
{
xmlAutoFree char * const pointsDef = (char *)xmlTextReaderGetAttribute(_xmlReader, (xmlChar*)"points");
NSScanner *scanner = pointsDef ? [NSScanner scannerWithString:@(pointsDef)] : nil;
scanner.charactersToBeSkipped = [NSCharacterSet characterSetWithCharactersInString:@", "];
double x, y;
if(![scanner scanDouble:&x] || ![scanner scanDouble:&y]) {
NSLog(@"*** Error: Too few points in <poly*>");
return NULL;
}
NSString * const pathDef = [NSString stringWithFormat:@"M%f,%fL%@",
x, y, [scanner.string substringFromIndex:scanner.scanLocation]];
CGMutablePathRef const path = pathDefinitionParser(pathDef).parse();
if(!path) {
NSLog(@"*** Error: Invalid path attribute");
return NULL;
} else
return path;
}
CF_RETURNS_RETAINED CGPathRef svgParser::readPolylineTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "polyline") == 0,
@"Not on a <polyline>");
return _readPolylineTag();
}
CF_RETURNS_RETAINED CGPathRef svgParser::readPolygonTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "polygon") == 0,
@"Not on a <polygon>");
CGMutablePathRef path = _readPolylineTag();
CGPathCloseSubpath(path);
return path;
}
CF_RETURNS_RETAINED CGPathRef svgParser::readCircleTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "circle") == 0,
@"Not on a <circle>");
CGPoint const center = {
readFloatAttribute(@"cx"), readFloatAttribute(@"cy")
};
float r = readFloatAttribute(@"r");
CGMutablePathRef circle = CGPathCreateMutable();
CGPathAddEllipseInRect(circle, NULL, CGRectMake(center.x - r, center.y - r, r * 2.0, r * 2.0));
return circle;
}
CF_RETURNS_RETAINED CGPathRef svgParser::readEllipseTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "ellipse") == 0,
@"Not on a <ellipse>");
CGPoint const center = {
readFloatAttribute(@"cx"), readFloatAttribute(@"cy")
};
float rx = readFloatAttribute(@"rx");
float ry = readFloatAttribute(@"ry");
if (!hasAttribute(@"rx")) {
rx = ry;
}
if (!hasAttribute(@"ry")) {
ry = rx;
}
CGMutablePathRef ellipse = CGPathCreateMutable();
CGPathAddEllipseInRect(ellipse, NULL, CGRectMake(center.x - rx, center.y - ry, rx * 2.0, ry * 2.0));
return ellipse;
}
CF_RETURNS_RETAINED CGPathRef svgParser::readLineTag()
{
NSCAssert(strcasecmp((char*)xmlTextReaderConstName(_xmlReader), "line") == 0,
@"Not on a <line>");
float x1 = readFloatAttribute(@"x1");
float y1 = readFloatAttribute(@"y1");
float x2 = readFloatAttribute(@"x2");
float y2 = readFloatAttribute(@"y2");
CGMutablePathRef line = CGPathCreateMutable();
CGPathMoveToPoint(line, NULL, x1, y1);
CGPathAddLineToPoint(line, NULL, x2, y2);
return line;
}
NSDictionary *svgParser::readAttributes()
{
NSMutableDictionary * const attrs = [_attributeStack.lastObject mutableCopy]
?: [NSMutableDictionary new];
if(!xmlTextReaderHasAttributes(_xmlReader))
return attrs;
xmlTextReaderMoveToFirstAttribute(_xmlReader);
do {
const char * const attrName = (char *)xmlTextReaderConstName(_xmlReader),
* const attrValue = (char *)xmlTextReaderConstValue(_xmlReader);
if(strcasecmp("style", attrName) == 0){
NSMutableDictionary *style = _SVGParseStyle(@(attrValue));
// Don't allow overriding of display:none
if (style[@"display"] && [style[@"display"] caseInsensitiveCompare:@"none"] == NSOrderedSame) {
[style removeObjectForKey:@"display"];
}
[attrs addEntriesFromDictionary:style];
} else if(strcasecmp("transform", attrName) == 0) {
// TODO: report syntax errors
NSScanner * const scanner = [NSScanner scannerWithString:@(attrValue)];
NSMutableCharacterSet *skippedChars = [NSCharacterSet.whitespaceAndNewlineCharacterSet mutableCopy];
[skippedChars addCharactersInString:@"(),"];
scanner.charactersToBeSkipped = skippedChars;
CGAffineTransform transform = attrs[@"transform"]
? [attrs[@"transform"] svg_CGAffineTransformValue]
: CGAffineTransformIdentity;
NSString *transformCmd;
std::vector<float> transformOperands;
while([scanner scanUpToString:@"(" intoString:&transformCmd]) {
transformOperands.clear();
for(float operand;
[scanner scanFloat:&operand];
transformOperands.push_back(operand));
CGAffineTransform additionalTransform = CGAffineTransformIdentity;
if([transformCmd isEqualToString:@"matrix"] && transformOperands.size() >= 6) {
additionalTransform = CGAffineTransformMake(transformOperands[0], transformOperands[1],
transformOperands[2], transformOperands[3],
transformOperands[4], transformOperands[5]);
} else if([transformCmd isEqualToString:@"rotate"] && transformOperands.size() >= 1) {
float const radians = transformOperands[0] * M_PI / 180.0;
if (transformOperands.size() == 3) {
float const x = transformOperands[1];
float const y = transformOperands[2];
additionalTransform = CGAffineTransformMake(cosf(radians), sinf(radians),
-sinf(radians), cosf(radians),
x-x*cosf(radians)+y*sinf(radians), y-x*sinf(radians)-y*cosf(radians));
}
else {
additionalTransform = CGAffineTransformMake(cosf(radians), sinf(radians),
-sinf(radians), cosf(radians),
0, 0);
}
} else if([transformCmd isEqualToString:@"translate"] && transformOperands.size() >= 1) {
float tx = transformOperands[0];
float ty = 0;
if (transformOperands.size() >= 2)
ty = transformOperands[1];
additionalTransform = CGAffineTransformMakeTranslation(tx, ty);
} else if([transformCmd isEqualToString:@"scale"] && transformOperands.size() >= 1) {
float sx = transformOperands[0];
float sy = sx;
if (transformOperands.size() >= 2)
sy = transformOperands[1];
additionalTransform = CGAffineTransformMakeScale(sx, sy);
} else if([transformCmd isEqualToString:@"skewX"] && transformOperands.size() >= 1) {
additionalTransform.c = tanf(transformOperands[0] * M_PI / 180.0);
} else if([transformCmd isEqualToString:@"skewY"] && transformOperands.size() >= 1) {
additionalTransform.b = tanf(transformOperands[0] * M_PI / 180.0);
}
transform = CGAffineTransformConcat(additionalTransform, transform);
}
if(attrs[@"transform"] || !CGAffineTransformEqualToTransform(transform, CGAffineTransformIdentity))
attrs[@"transform"] = [NSValue svg_valueWithCGAffineTransform:transform];
} else
attrs[@(attrName)] = @(attrValue);
} while(xmlTextReaderMoveToNextAttribute(_xmlReader));
xmlTextReaderMoveToElement(_xmlReader);
for(NSString *attr in attrs.allKeys) {
if([attrs[attr] isKindOfClass:[NSString class]] &&
([attr isEqualToString:@"fill"] || [attr isEqualToString:@"stroke"]))
{
if([attrs[attr] isEqual:@"none"]) {
CGColorSpaceRef const colorSpace = CGColorSpaceCreateDeviceRGB();
attrs[attr] = (__bridge_transfer id)CGColorCreate(colorSpace, (CGFloat[]) { 1, 1, 1, 0 });
CFRelease(colorSpace);
} else
attrs[attr] = (__bridge_transfer id)hexTriplet(attrs[attr]).CGColor();
}
}
if(attrs[@"fill"] && attrs[@"fill-opacity"] && [attrs[@"fill-opacity"] floatValue] < 1.0) {
attrs[@"fill"] = (__bridge_transfer id)CGColorCreateCopyWithAlpha((__bridge CGColorRef)attrs[@"fill"],
[attrs[@"fill-opacity"] floatValue]);
[attrs removeObjectForKey:@"fill-opacity"];
}
if(attrs[@"stroke"] && attrs[@"stroke-opacity"] && [attrs[@"stroke-opacity"] floatValue] < 1.0) {
attrs[@"stroke"] = (__bridge_transfer id)CGColorCreateCopyWithAlpha((__bridge CGColorRef)attrs[@"stroke"],
[attrs[@"stroke-opacity"] floatValue]);
[attrs removeObjectForKey:@"stroke-opacity"];
}
return attrs.count > 0 ? attrs : nil;
}
float svgParser::readFloatAttribute(NSString * const aName)
{
xmlAutoFree char *value = (char *)xmlTextReaderGetAttribute(_xmlReader, (xmlChar*)[aName UTF8String]);
return value ? strtof(value, NULL) : 0.0;
}
bool svgParser::hasAttribute(NSString * const aName)
{
xmlAutoFree char *value = (char *)xmlTextReaderGetAttribute(_xmlReader, (xmlChar*)[aName UTF8String]);
return value != NULL;
}
NSString *svgParser::readStringAttribute(NSString * const aName)
{
xmlAutoFree char *value = (char *)xmlTextReaderGetAttribute(_xmlReader, (xmlChar*)[aName UTF8String]);
return value ? @(value) : nil;
}
NSArray *CGPathsFromSVGString(NSString * const svgString, SVGAttributeSet **outAttributes)
{
NSMapTable *attributes;
NSArray *paths = svgParser(svgString).parse(outAttributes ? &attributes : NULL);
if (outAttributes && (*outAttributes = [SVGAttributeSet new])) {
(*outAttributes)->_attributes = attributes;
}
return paths;
}
/// This parses a single isolated path. creating a cgpath from just a string formated like the d elemen in a path
CGPathRef CGPathFromSVGPathString(NSString *svgString) {
CGPathRef const path = pathDefinitionParser(svgString).parse();
if(!path) {
NSLog(@"*** Error: Invalid path attribute");
return NULL;
} else
return path;
}
NSString *SVGStringFromCGPaths(NSArray * const paths, SVGAttributeSet * const attributes)
{
CGRect bounds = CGRectZero;
NSMutableString * const svg = [NSMutableString new];
for(id path in paths) {
bounds = CGRectUnion(bounds, CGPathGetBoundingBox((__bridge CGPathRef)path));
[svg appendString:@" <path"];
NSDictionary *pathAttrs = [attributes attributesForPath:(__bridge CGPathRef)path];
for(NSString *key in pathAttrs) {
if(![pathAttrs[key] isKindOfClass:[NSString class]]) { // Color
[svg appendFormat:@" %@=\"%@\"", key, hexTriplet((__bridge CGColorRef)pathAttrs[key]).string()];
float const alpha = CGColorGetAlpha((__bridge CGColorRef)pathAttrs[key]);
if(alpha < 1.0)
[svg appendFormat:@" %@-opacity=\"%.2g\"", key, alpha];
} else
[svg appendFormat:@" %@=\"%@\"", key, pathAttrs[key]];
}
[svg appendString:@" d=\""];
CGPathApply((__bridge CGPathRef)path, (__bridge void *)svg,
[](void * const info, const CGPathElement * const el)
{
NSMutableString * const svg_ = (__bridge id)info;
#define FMT(n) _SVGFormatNumber(@(n))
switch(el->type) {
case kCGPathElementMoveToPoint:
[svg_ appendFormat:@"M%@,%@", FMT(el->points[0].x), FMT(el->points[0].y)];
break;
case kCGPathElementAddLineToPoint:
[svg_ appendFormat:@"L%@,%@", FMT(el->points[0].x), FMT(el->points[0].y)];
break;
case kCGPathElementAddQuadCurveToPoint:
[svg_ appendFormat:@"Q%@,%@,%@,%@", FMT(el->points[0].x), FMT(el->points[0].y),
FMT(el->points[1].x), FMT(el->points[1].y)];
break;
case kCGPathElementAddCurveToPoint:
[svg_ appendFormat:@"C%@,%@,%@,%@,%@,%@", FMT(el->points[0].x), FMT(el->points[0].y),
FMT(el->points[1].x), FMT(el->points[1].y),
FMT(el->points[2].x), FMT(el->points[2].y)];
break;
case kCGPathElementCloseSubpath:
[svg_ appendFormat:@"Z"];
break;
}
#undef FMT
});
[svg appendString:@"\"/>\n"];
}
return [NSString stringWithFormat:
@"<svg xmlns=\"http://www.w3.org/2000/svg\""
@" xmlns:xlink=\"http://www.w3.org/1999/xlink\""
@" width=\"%.0f\" height=\"%.0f\">\n%@\n</svg>\n",
bounds.size.width,
bounds.size.height,
svg];
}
pathDefinitionParser::pathDefinitionParser(NSString *aDefinition)
{
_definition = [aDefinition stringByTrimmingCharactersInSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
}
CF_RETURNS_RETAINED CGMutablePathRef pathDefinitionParser::parse()
{
#ifdef SVG_PATH_SERIALIZER_DEBUG
NSLog(@"d=%@", attr);
#endif
_path = CGPathCreateMutable();
NSScanner * const scanner = [NSScanner scannerWithString:_definition];
static NSCharacterSet *separators, *commands;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
commands = [NSCharacterSet characterSetWithCharactersInString:kValidSVGCommands];
separators = [NSMutableCharacterSet characterSetWithCharactersInString:@","];
[(NSMutableCharacterSet *)separators formUnionWithCharacterSet:NSCharacterSet.whitespaceAndNewlineCharacterSet];
});
scanner.charactersToBeSkipped = separators;
NSString *cmdBuf;
while([scanner scanCharactersFromSet:commands intoString:&cmdBuf]) {
_operands.clear();
if([cmdBuf length] > 1) {
scanner.scanLocation -= [cmdBuf length]-1;
} else {
for(float operand;
[scanner scanFloat:&operand];
_operands.push_back(operand));
}
#ifdef SVG_PATH_SERIALIZER_DEBUG
NSLog(@"%c %@", opcode, operands);
#endif
_lastCmd = _cmd;
_cmd = [cmdBuf characterAtIndex:0];
if (![cmdBuf.uppercaseString hasPrefix:@"M"] && CGPathIsEmpty(_path)) {
// Workaround for https://github.com/pocketsvg/PocketSVG/issues/128
CGPathMoveToPoint(_path, NULL, 0, 0);
}
switch(_cmd) {
case 'M': case 'm':
appendMoveTo();
break;
case 'L': case 'l':
case 'H': case 'h':
case 'V': case 'v':
appendLineTo();
break;
case 'C': case 'c':
appendCubicCurve();
break;
case 'S': case 's':
appendShorthandCubicCurve();
break;
case 'Q': case 'q':
appendQuadraticCurve();
break;
case 'T': case 't':
appendShorthandQuadraticCurve();
break;
case 'A': case 'a':
appendArc();
break;
case 'Z': case 'z':
CGPathCloseSubpath(_path);
break;
default:
NSLog(@"*** Error: Cannot process command : '%c'", _cmd);
break;
}
}
if(scanner.scanLocation < [_definition length])
NSLog(@"*** SVG parse error at index: %d: '%c'",
(int)scanner.scanLocation, [_definition characterAtIndex:scanner.scanLocation]);
return _path;
}
void pathDefinitionParser::appendMoveTo()
{
if(_operands.size()%2 != 0) {
NSLog(@"*** Error: Invalid parameter count in M style token");
return;
}
for(NSUInteger i = 0; i < _operands.size(); i += 2) {
CGPoint currentPoint = (_cmd == 'm' && !CGPathIsEmpty(_path))
? CGPathGetCurrentPoint(_path)
: CGPointZero;
CGFloat x = _operands[i+0] + currentPoint.x;
CGFloat y = _operands[i+1] + currentPoint.y;
if(i == 0)
CGPathMoveToPoint(_path, NULL, x, y);
else
CGPathAddLineToPoint(_path, NULL, x, y);
}
}
void pathDefinitionParser::appendLineTo()
{
for(NSUInteger i = 0; i < _operands.size(); ++i) {
CGFloat x = 0;
CGFloat y = 0;
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
switch(_cmd) {
case 'l':
x = currentPoint.x;
y = currentPoint.y;
case 'L':
x += _operands[i];
if (++i == _operands.size()) {
NSLog(@"*** Error: Invalid parameter count in L style token");
return;
}
y += _operands[i];
break;
case 'h' :
x = currentPoint.x;
case 'H' :
x += _operands[i];
y = currentPoint.y;
break;
case 'v' :
y = currentPoint.y;
case 'V' :
y += _operands[i];
x = currentPoint.x;
break;
default:
NSLog(@"*** Error: Unrecognised L style command.");
return;
}
CGPathAddLineToPoint(_path, NULL, x, y);
}
}
void pathDefinitionParser::appendCubicCurve()
{
if(_operands.size()%6 != 0) {
NSLog(@"*** Error: Invalid number of parameters for C command");
return;
}
// (x1, y1, x2, y2, x, y)
for(NSUInteger i = 0; i < _operands.size(); i += 6) {
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
CGFloat const x1 = _operands[i+0] + (_cmd == 'c' ? currentPoint.x : 0);
CGFloat const y1 = _operands[i+1] + (_cmd == 'c' ? currentPoint.y : 0);
CGFloat const x2 = _operands[i+2] + (_cmd == 'c' ? currentPoint.x : 0);
CGFloat const y2 = _operands[i+3] + (_cmd == 'c' ? currentPoint.y : 0);
CGFloat const x = _operands[i+4] + (_cmd == 'c' ? currentPoint.x : 0);
CGFloat const y = _operands[i+5] + (_cmd == 'c' ? currentPoint.y : 0);
CGPathAddCurveToPoint(_path, NULL, x1, y1, x2, y2, x, y);
_lastControlPoint = CGPointMake(x2, y2);
}
}
void pathDefinitionParser::appendShorthandCubicCurve()
{
if(_operands.size()%4 != 0) {
NSLog(@"*** Error: Invalid number of parameters for S command");
return;
}
if(_lastCmd != 'C' && _lastCmd != 'c' && _lastCmd != 'S' && _lastCmd != 's')
_lastControlPoint = CGPathGetCurrentPoint(_path);
// (x2, y2, x, y)
for(NSUInteger i = 0; i < _operands.size(); i += 4) {
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
CGFloat const x1 = currentPoint.x + (currentPoint.x - _lastControlPoint.x);
CGFloat const y1 = currentPoint.y + (currentPoint.y - _lastControlPoint.y);
CGFloat const x2 = _operands[i+0] + (_cmd == 's' ? currentPoint.x : 0);
CGFloat const y2 = _operands[i+1] + (_cmd == 's' ? currentPoint.y : 0);
CGFloat const x = _operands[i+2] + (_cmd == 's' ? currentPoint.x : 0);
CGFloat const y = _operands[i+3] + (_cmd == 's' ? currentPoint.y : 0);
CGPathAddCurveToPoint(_path, NULL, x1, y1, x2, y2, x, y);
_lastControlPoint = CGPointMake(x2, y2);
}
}
void pathDefinitionParser::appendQuadraticCurve()
{
if(_operands.size()%4 != 0) {
NSLog(@"*** Error: Invalid number of parameters for Q command");
return;
}
// (x1, y1, x, y)
for(NSUInteger i = 0; i < _operands.size(); i += 4) {
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
CGFloat const x1 = _operands[i+0] + (_cmd == 'q' ? currentPoint.x : 0);
CGFloat const y1 = _operands[i+1] + (_cmd == 'q' ? currentPoint.y : 0);
CGFloat const x = _operands[i+2] + (_cmd == 'q' ? currentPoint.x : 0);
CGFloat const y = _operands[i+3] + (_cmd == 'q' ? currentPoint.y : 0);
CGPathAddQuadCurveToPoint(_path, NULL, x1, y1, x, y);
_lastControlPoint = CGPointMake(x1, y1);
}
}
void pathDefinitionParser::appendShorthandQuadraticCurve()
{
if(_operands.size()%2 != 0) {
NSLog(@"*** Error: Invalid number of parameters for T command");
return;
}
if(_lastCmd != 'Q' && _lastCmd != 'q' && _lastCmd != 'T' && _lastCmd != 't')
_lastControlPoint = CGPathGetCurrentPoint(_path);
// (x, y)
for(NSUInteger i = 0; i < _operands.size(); i += 2) {
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
CGFloat const x1 = currentPoint.x + (currentPoint.x - _lastControlPoint.x);
CGFloat const y1 = currentPoint.y + (currentPoint.y - _lastControlPoint.y);
CGFloat const x = _operands[i+0] + (_cmd == 't' ? currentPoint.x : 0);
CGFloat const y = _operands[i+1] + (_cmd == 't' ? currentPoint.y : 0);
CGPathAddQuadCurveToPoint(_path, NULL, x1, y1, x, y);
_lastControlPoint = CGPointMake(x1, y1);
}
}
static double vectorAngle(double ux, double uy, double vx, double vy)
{
const double sign = (ux * vy - uy * vx < 0) ? -1 : 1;
const double umag = sqrt(ux * ux + uy * uy);
const double vmag = sqrt(ux * ux + uy * uy);
const double dot = ux * vx + uy * vy;
double div = dot / (umag * vmag);
if (div > 1) {
div = 1;
}
if (div < -1) {
div = -1;
}
return sign * acos(div);
}
static CGPoint mapToEllipse(double x, double y, double rx, double ry, double cosphi, double sinphi, double centerx, double centery)
{
x *= rx;
y *= ry;
const double xp = cosphi * x - sinphi * y;
const double yp = sinphi * x + cosphi * y;
return CGPointMake((CGFloat)(xp + centerx), (CGFloat)(yp + centery));
}
void pathDefinitionParser::appendArc()
{
if (_operands.size()%7 != 0) {
NSLog(@"*** Error: Invalid number of parameters for A command");
return;
}
for(NSUInteger offset = 0; offset < _operands.size(); offset += 7) {
CGPoint const currentPoint = CGPathGetCurrentPoint(_path);
double const px = currentPoint.x;
double const py = currentPoint.y;
double rx = _operands[offset];
double ry = _operands[offset+1];
double const xAxisRotation = _operands[offset+2];
double const largeArcFlag = _operands[offset+3];
double const sweepFlag = _operands[offset+4];
double const cx = _operands[offset+5] + (_cmd == 'a' ? currentPoint.x : 0);
double const cy = _operands[offset+6] + (_cmd == 'a' ? currentPoint.y : 0);
const double TAU = M_PI * 2.0;
const double sinphi = sin(xAxisRotation * TAU / 360);
const double cosphi = cos(xAxisRotation * TAU / 360);
const double pxp = cosphi * (px - cx) / 2 + sinphi * (py - cy) / 2;
const double pyp = -sinphi * (px - cx) / 2 + cosphi * (py - cy) / 2;
if (pxp == 0 && pyp == 0) {
return;
}
rx = abs(rx);
ry = abs(ry);
const double lambda = (CGFloat) (pow(pxp, 2) / pow(rx, 2) + pow(pyp, 2) / pow(ry, 2));
if (lambda > 1) {
rx *= sqrt(lambda);
ry *= sqrt(lambda);
}
const double rxsq = pow(rx, 2);
const double rysq = pow(ry, 2);
const double pxpsq = pow(pxp, 2);
const double pypsq = pow(pyp, 2);
double radicant = (rxsq * rysq) - (rxsq * pypsq) - (rysq * pxpsq);
if (radicant < 0) {
radicant = 0;
}
radicant /= (rxsq * pypsq) + (rysq * pxpsq);
radicant = sqrt(radicant) * (largeArcFlag == sweepFlag ? -1 : 1);
const double centerxp = radicant * rx / ry * pyp;
const double centeryp = radicant * -ry / rx * pxp;
const double centerx = cosphi * centerxp - sinphi * centeryp + (px + cx) / 2;
const double centery = sinphi * centerxp + cosphi * centeryp + (py + cy) / 2;
const double vx1 = (pxp - centerxp) / rx;
const double vy1 = (pyp - centeryp) / ry;
const double vx2 = (-pxp - centerxp) / rx;
const double vy2 = (-pyp - centeryp) / ry;
double ang1 = vectorAngle(1, 0, vx1, vy1);
double ang2 = vectorAngle(vx1, vy1, vx2, vy2);
if (sweepFlag == 0 && ang2 > 0) {
ang2 -= TAU;
}
if (sweepFlag == 1 && ang2 < 0) {
ang2 += TAU;
}
const int segments = (int) MAX(ceil(abs(ang2) / (TAU / 4.0)), 1.0);
ang2 /= segments;
for (int i = 0; i < segments; i++) {
const double a = 4.0 / 3.0 * tan(ang2 / 4.0);
const double x1 = cos(ang1);
const double y1 = sin(ang1);
const double x2 = cos(ang1 + ang2);
const double y2 = sin(ang1 + ang2);
CGPoint p1 = mapToEllipse(x1 - y1 * a, y1 + x1 * a, rx, ry, cosphi, sinphi, centerx, centery);
CGPoint p2 = mapToEllipse(x2 + y2 * a, y2 - x2 * a, rx, ry, cosphi, sinphi, centerx, centery);
CGPoint p = mapToEllipse(x2, y2, rx, ry, cosphi, sinphi, centerx, centery);
CGPathAddCurveToPoint(_path, NULL, p1.x, p1.y, p2.x, p2.y, p.x, p.y);
_lastControlPoint = p2;
ang1 += ang2;
}
}
}
hexTriplet::hexTriplet(NSString *str)
{
static NSDictionary *colorMap = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSURL *url = [[NSBundle bundleForClass:[SVGAttributeSet class]] URLForResource:@"SVGColors" withExtension:@"plist"];
colorMap = [NSDictionary dictionaryWithContentsOfURL:url];
});
NSString *mapped = colorMap[[str lowercaseString]];
if (mapped) {
str = mapped;
}
if ([str hasPrefix:@"rgb("]) {
NSCParameterAssert([str hasSuffix:@")"]);
NSArray<NSString*>* parts = [[str substringWithRange:(NSRange) { 4, str.length-5 }] componentsSeparatedByString:@","];
NSCParameterAssert([parts count] == 3);
str = [NSString stringWithFormat:@"#%02x%02x%02x", (unsigned int)parts[0].integerValue, (unsigned int)parts[1].integerValue, (unsigned int)parts[2].integerValue];
} else {
NSCParameterAssert([str hasPrefix:@"#"]);
NSCParameterAssert([str length] == 4 || [str length] == 7);
if([str length] == 4) {
str = [str mutableCopy];
[(NSMutableString *)str insertString:[str substringWithRange:(NSRange) { 3, 1 }]
atIndex:3];
[(NSMutableString *)str insertString:[str substringWithRange:(NSRange) { 2, 1 }]
atIndex:2];
[(NSMutableString *)str insertString:[str substringWithRange:(NSRange) { 1, 1 }]
atIndex:1];
}
}
_data = (uint32_t)strtol([str cStringUsingEncoding:NSASCIIStringEncoding]+1, NULL, 16);
}
hexTriplet::hexTriplet(CGColorRef const color)
{
const CGFloat * const rgba = CGColorGetComponents(color);
_data = (((uint8_t)roundf(rgba[0] * 255) & 0xff) << 16)
| (((uint8_t)roundf(rgba[1] * 255) & 0xff) << 8)
| ( (uint8_t)roundf(rgba[2] * 255) & 0xff);
}
CGColorRef hexTriplet::CGColor()
{
CGColorSpaceRef const colorSpace = CGColorSpaceCreateDeviceRGB();
CGColorRef const color = CGColorCreate(colorSpace,
(CGFloat[]) {
((_data & 0xFF0000) >> 16) / (CGFloat)255.0,
((_data & 0x00FF00) >> 8) / (CGFloat)255.0,
((_data & 0x0000FF)) / (CGFloat)255.0,
1
});
CFRelease(colorSpace);
return color;
}
NSString *hexTriplet::string()
{
return [NSString stringWithFormat:@"#%02x%02x%02x",
(_data & 0xFF0000) >> 16,
(_data & 0x00FF00) >> 8,
(_data & 0x0000FF)];
}
static NSMutableDictionary *_SVGParseStyle(NSString * const body)
{
NSScanner * const scanner = [NSScanner scannerWithString:body];
NSMutableCharacterSet * const separators = NSMutableCharacterSet.whitespaceAndNewlineCharacterSet;
[separators addCharactersInString:@":;"];
scanner.charactersToBeSkipped = separators;
NSMutableDictionary * const style = [NSMutableDictionary new];
NSString *key, *value;
while([scanner scanUpToString:@":" intoString:&key]) {
if(![scanner scanUpToString:@";" intoString:&value]) {
NSLog(@"Parse error in style: '%@'", body);
return nil;
}
style[key] = value;
}
return style;
}
static NSString *_SVGFormatNumber(NSNumber * const aNumber)
{
static NSNumberFormatter *fmt;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
fmt = [NSNumberFormatter new];
fmt.numberStyle = NSNumberFormatterDecimalStyle;
fmt.maximumFractionDigits = 3;
fmt.decimalSeparator = @".";
fmt.minusSign = @"-";
fmt.usesGroupingSeparator = NO;
});
return [fmt stringFromNumber:aNumber];
}
@implementation SVGAttributeSet
- (NSDictionary<NSString*,id> *)attributesForPath:(CGPathRef)path
{
return [_attributes objectForKey:(__bridge id)path];
}
- (id)copyWithZone:(NSZone *)zone
{
SVGMutableAttributeSet *copy = [self.class new];
if (copy) {
copy->_attributes = [_attributes copy];
}
return copy;
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
SVGMutableAttributeSet *copy = [SVGMutableAttributeSet new];
if (copy) {
copy->_attributes = [_attributes copy];
}
return copy;
}
@end