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1 /*
2 * This file is part of Libsvgtiny
3 * Licensed under the MIT License,
4 * http://opensource.org/licenses/mit-license.php
5 * Copyright 2008-2009 James Bursa <james@semichrome.net>
6 * Copyright 2012 Daniel Silverstone <dsilvers@netsurf-browser.org>
7 */
8
9 #include <assert.h>
10 #include <math.h>
11 #include <setjmp.h>
12 #include <stdbool.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16
17 #include <dom/dom.h>
18 #include <dom/bindings/xml/xmlparser.h>
19
20 #include <libcss/libcss.h>
21
22 #include "svgtiny.h"
23 #include "svgtiny_internal.h"
24
25 /* Source file generated by `gperf`. */
26 #include "autogenerated_colors.c"
27
28 #define TAU 6.28318530717958647692
29
30 #ifndef M_PI
31 #define M_PI 3.14159265358979323846
32 #endif
33
34 #ifndef M_PI_2
35 #define M_PI_2 1.57079632679489661923
36 #endif
37
38 #define KAPPA 0.5522847498
39
40 #define degToRad(angleInDegrees) ((angleInDegrees) * M_PI / 180.0)
41 #define radToDeg(angleInRadians) ((angleInRadians) * 180.0 / M_PI)
42
43 static svgtiny_code svgtiny_parse_style_element(dom_element *style,
44 struct svgtiny_parse_state state);
45 static css_stylesheet *svgtiny_parse_style_inline(const uint8_t *data,
46 size_t len);
47 static svgtiny_code svgtiny_preparse_styles(dom_element *svg,
48 struct svgtiny_parse_state state);
49 static svgtiny_code svgtiny_parse_svg(dom_element *svg,
50 struct svgtiny_parse_state state);
51 static svgtiny_code svgtiny_parse_path(dom_element *path,
52 struct svgtiny_parse_state state);
53 static svgtiny_code svgtiny_parse_rect(dom_element *rect,
54 struct svgtiny_parse_state state);
55 static svgtiny_code svgtiny_parse_circle(dom_element *circle,
56 struct svgtiny_parse_state state);
57 static svgtiny_code svgtiny_parse_ellipse(dom_element *ellipse,
58 struct svgtiny_parse_state state);
59 static svgtiny_code svgtiny_parse_line(dom_element *line,
60 struct svgtiny_parse_state state);
61 static svgtiny_code svgtiny_parse_poly(dom_element *poly,
62 struct svgtiny_parse_state state, bool polygon);
63 static svgtiny_code svgtiny_parse_text(dom_element *text,
64 struct svgtiny_parse_state state);
65 static void svgtiny_parse_position_attributes(dom_element *node,
66 const struct svgtiny_parse_state state,
67 float *x, float *y, float *width, float *height);
68 static void svgtiny_parse_paint_attributes(dom_element *node,
69 struct svgtiny_parse_state *state);
70 static void svgtiny_parse_font_attributes(dom_element *node,
71 struct svgtiny_parse_state *state);
72 static void svgtiny_parse_transform_attributes(dom_element *node,
73 struct svgtiny_parse_state *state);
74 static svgtiny_code svgtiny_add_path(float *p, unsigned int n,
75 struct svgtiny_parse_state *state);
76 static void _svgtiny_parse_color(const char *s, svgtiny_colour *c,
77 struct svgtiny_parse_state_gradient *grad,
78 struct svgtiny_parse_state *state);
79
80 /**
81 * rotate midpoint vector
82 */
83 static void
84 rotate_midpoint_vector(float ax, float ay,
85 float bx, float by,
86 double radangle,
87 double *x_out, double *y_out)
88 {
89 double dx2; /* midpoint x coordinate */
90 double dy2; /* midpoint y coordinate */
91 double cosangle; /* cosine of rotation angle */
92 double sinangle; /* sine of rotation angle */
93
94 /* compute the sin and cos of the angle */
95 cosangle = cos(radangle);
96 sinangle = sin(radangle);
97
98 /* compute the midpoint between start and end points */
99 dx2 = (ax - bx) / 2.0;
100 dy2 = (ay - by) / 2.0;
101
102 /* rotate vector to remove angle */
103 *x_out = ((cosangle * dx2) + (sinangle * dy2));
104 *y_out = ((-sinangle * dx2) + (cosangle * dy2));
105 }
106
107
108 /**
109 * ensure the arc radii are large enough and scale as appropriate
110 *
111 * the radii need to be large enough if they are not they must be
112 * adjusted. This allows for elimination of differences between
113 * implementations especialy with rounding.
114 */
115 static void
116 ensure_radii_scale(double x1_sq, double y1_sq,
117 float *rx, float *ry,
118 double *rx_sq, double *ry_sq)
119 {
120 double radiisum;
121 double radiiscale;
122
123 /* set radii square values */
124 (*rx_sq) = (*rx) * (*rx);
125 (*ry_sq) = (*ry) * (*ry);
126
127 radiisum = (x1_sq / (*rx_sq)) + (y1_sq / (*ry_sq));
128 if (radiisum > 0.99999) {
129 /* need to scale radii */
130 radiiscale = sqrt(radiisum) * 1.00001;
131 *rx = (float)(radiiscale * (*rx));
132 *ry = (float)(radiiscale * (*ry));
133 /* update squares too */
134 (*rx_sq) = (*rx) * (*rx);
135 (*ry_sq) = (*ry) * (*ry);
136 }
137 }
138
139
140 /**
141 * compute the transformed centre point
142 */
143 static void
144 compute_transformed_centre_point(double sign, float rx, float ry,
145 double rx_sq, double ry_sq,
146 double x1, double y1,
147 double x1_sq, double y1_sq,
148 double *cx1, double *cy1)
149 {
150 double sq;
151 double coef;
152 sq = ((rx_sq * ry_sq) - (rx_sq * y1_sq) - (ry_sq * x1_sq)) /
153 ((rx_sq * y1_sq) + (ry_sq * x1_sq));
154 sq = (sq < 0) ? 0 : sq;
155
156 coef = (sign * sqrt(sq));
157
158 *cx1 = coef * ((rx * y1) / ry);
159 *cy1 = coef * -((ry * x1) / rx);
160 }
161
162
163 /**
164 * compute untransformed centre point
165 *
166 * \param ax The first point x coordinate
167 * \param ay The first point y coordinate
168 * \param bx The second point x coordinate
169 * \param ay The second point y coordinate
170 */
171 static void
172 compute_centre_point(float ax, float ay,
173 float bx, float by,
174 double cx1, double cy1,
175 double radangle,
176 double *x_out, double *y_out)
177 {
178 double sx2;
179 double sy2;
180 double cosangle; /* cosine of rotation angle */
181 double sinangle; /* sine of rotation angle */
182
183 /* compute the sin and cos of the angle */
184 cosangle = cos(radangle);
185 sinangle = sin(radangle);
186
187 sx2 = (ax + bx) / 2.0;
188 sy2 = (ay + by) / 2.0;
189
190 *x_out = sx2 + (cosangle * cx1 - sinangle * cy1);
191 *y_out = sy2 + (sinangle * cx1 + cosangle * cy1);
192 }
193
194
195 /**
196 * compute the angle start and extent
197 */
198 static void
199 compute_angle_start_extent(float rx, float ry,
200 double x1, double y1,
201 double cx1, double cy1,
202 double *start, double *extent)
203 {
204 double sign;
205 double ux;
206 double uy;
207 double vx;
208 double vy;
209 double p, n;
210 double actmp;
211
212 /*
213 * Angle betwen two vectors is +/- acos( u.v / len(u) * len(v))
214 * Where:
215 * '.' is the dot product.
216 * +/- is calculated from the sign of the cross product (u x v)
217 */
218
219 ux = (x1 - cx1) / rx;
220 uy = (y1 - cy1) / ry;
221 vx = (-x1 - cx1) / rx;
222 vy = (-y1 - cy1) / ry;
223
224 /* compute the start angle */
225 /* The angle between (ux, uy) and the 0 angle */
226
227 /* len(u) * len(1,0) == len(u) */
228 n = sqrt((ux * ux) + (uy * uy));
229 /* u.v == (ux,uy).(1,0) == (1 * ux) + (0 * uy) == ux */
230 p = ux;
231 /* u x v == (1 * uy - ux * 0) == uy */
232 sign = (uy < 0) ? -1.0 : 1.0;
233 /* (p >= n) so safe */
234 *start = sign * acos(p / n);
235
236 /* compute the extent angle */
237 n = sqrt(((ux * ux) + (uy * uy)) * ((vx * vx) + (vy * vy)));
238 p = (ux * vx) + (uy * vy);
239 sign = ((ux * vy) - (uy * vx) < 0) ? -1.0f : 1.0f;
240
241 /* arc cos must operate between -1 and 1 */
242 actmp = p / n;
243 if (actmp < -1.0) {
244 *extent = sign * M_PI;
245 } else if (actmp > 1.0) {
246 *extent = 0;
247 } else {
248 *extent = sign * acos(actmp);
249 }
250 }
251
252
253 /**
254 * converts a circle centered unit circle arc to a series of bezier curves
255 *
256 * Each bezier is stored as six values of three pairs of coordinates
257 *
258 * The beziers are stored without their start point as that is assumed
259 * to be the preceding elements end point.
260 *
261 * \param start The start angle of the arc (in radians)
262 * \param extent The size of the arc (in radians)
263 * \param bzpt The array to store the bezier values in
264 * \return The number of bezier segments output (max 4)
265 */
266 static int
267 circle_arc_to_bezier(double start, double extent, double *bzpt)
268 {
269 int bzsegments;
270 double increment;
271 double controllen;
272 int pos = 0;
273 int segment;
274 double angle;
275 double dx, dy;
276
277 bzsegments = (int) ceil(fabs(extent) / M_PI_2);
278 increment = extent / bzsegments;
279 controllen = 4.0 / 3.0 * sin(increment / 2.0) / (1.0 + cos(increment / 2.0));
280
281 for (segment = 0; segment < bzsegments; segment++) {
282 /* first control point */
283 angle = start + (segment * increment);
284 dx = cos(angle);
285 dy = sin(angle);
286 bzpt[pos++] = dx - controllen * dy;
287 bzpt[pos++] = dy + controllen * dx;
288 /* second control point */
289 angle+=increment;
290 dx = cos(angle);
291 dy = sin(angle);
292 bzpt[pos++] = dx + controllen * dy;
293 bzpt[pos++] = dy - controllen * dx;
294 /* endpoint */
295 bzpt[pos++] = dx;
296 bzpt[pos++] = dy;
297
298 }
299 return bzsegments;
300 }
301
302
303 /**
304 * transform coordinate list
305 *
306 * perform a scale, rotate and translate on list of coordinates
307 *
308 * scale(rx,ry)
309 * rotate(an)
310 * translate (cx, cy)
311 *
312 * homogeneous transforms
313 *
314 * scaling
315 * | rx 0 0 |
316 * S = | 0 ry 0 |
317 * | 0 0 1 |
318 *
319 * rotate
320 * | cos(an) -sin(an) 0 |
321 * R = | sin(an) cos(an) 0 |
322 * | 0 0 1 |
323 *
324 * {{cos(a), -sin(a) 0}, {sin(a), cos(a),0}, {0,0,1}}
325 *
326 * translate
327 * | 1 0 cx |
328 * T = | 0 1 cy |
329 * | 0 0 1 |
330 *
331 * note order is significat here and the combined matrix is
332 * M = T.R.S
333 *
334 * | cos(an) -sin(an) cx |
335 * T.R = | sin(an) cos(an) cy |
336 * | 0 0 1 |
337 *
338 * | rx * cos(an) ry * -sin(an) cx |
339 * T.R.S = | rx * sin(an) ry * cos(an) cy |
340 * | 0 0 1 |
341 *
342 * {{Cos[a], -Sin[a], c}, {Sin[a], Cos[a], d}, {0, 0, 1}} . {{r, 0, 0}, {0, s, 0}, {0, 0, 1}}
343 *
344 * Each point
345 * | x1 |
346 * P = | y1 |
347 * | 1 |
348 *
349 * output
350 * | x2 |
351 * | y2 | = M . P
352 * | 1 |
353 *
354 * x2 = cx + (rx * x1 * cos(a)) + (ry * y1 * -1 * sin(a))
355 * y2 = cy + (ry * y1 * cos(a)) + (rx * x1 * sin(a))
356 *
357 *
358 * \param rx X scaling to apply
359 * \param ry Y scaling to apply
360 * \param radangle rotation to apply (in radians)
361 * \param cx X translation to apply
362 * \param cy Y translation to apply
363 * \param points The size of the bzpoints array
364 * \param bzpoints an array of x,y values to apply the transform to
365 */
366 static void
367 scale_rotate_translate_points(double rx, double ry,
368 double radangle,
369 double cx, double cy,
370 int pntsize,
371 double *points)
372 {
373 int pnt;
374 double cosangle; /* cosine of rotation angle */
375 double sinangle; /* sine of rotation angle */
376 double rxcosangle, rxsinangle, rycosangle, rynsinangle;
377 double x2,y2;
378
379 /* compute the sin and cos of the angle */
380 cosangle = cos(radangle);
381 sinangle = sin(radangle);
382
383 rxcosangle = rx * cosangle;
384 rxsinangle = rx * sinangle;
385 rycosangle = ry * cosangle;
386 rynsinangle = ry * -1 * sinangle;
387
388 for (pnt = 0; pnt < pntsize; pnt+=2) {
389 x2 = cx + (points[pnt] * rxcosangle) + (points[pnt + 1] * rynsinangle);
390 y2 = cy + (points[pnt + 1] * rycosangle) + (points[pnt] * rxsinangle);
391 points[pnt] = x2;
392 points[pnt + 1] = y2;
393 }
394 }
395
396
397 /**
398 * convert an svg path arc to a bezier curve
399 *
400 * This function perfoms a transform on the nine arc parameters
401 * (coordinate pairs for start and end together with the radii of the
402 * elipse, the rotation angle and which of the four arcs to draw)
403 * which generates the parameters (coordinate pairs for start,
404 * end and their control points) for a set of up to four bezier curves.
405 *
406 * Obviously the start and end coordinates are not altered between
407 * representations so the aim is to calculate the coordinate pairs for
408 * the bezier control points.
409 *
410 * \param bzpoints the array to fill with bezier curves
411 * \return the number of bezier segments generated or -1 for a line
412 */
413 static int
414 svgarc_to_bezier(float start_x,
415 float start_y,
416 float end_x,
417 float end_y,
418 float rx,
419 float ry,
420 float angle,
421 bool largearc,
422 bool sweep,
423 double *bzpoints)
424 {
425 double radangle; /* normalised elipsis rotation angle in radians */
426 double rx_sq; /* x radius squared */
427 double ry_sq; /* y radius squared */
428 double x1, y1; /* rotated midpoint vector */
429 double x1_sq, y1_sq; /* x1 vector squared */
430 double cx1,cy1; /* transformed circle center */
431 double cx,cy; /* circle center */
432 double start, extent;
433 int bzsegments;
434
435 if ((start_x == end_x) && (start_y == end_y)) {
436 /*
437 * if the start and end coordinates are the same the
438 * svg spec says this is equivalent to having no segment
439 * at all
440 */
441 return 0;
442 }
443
444 if ((rx == 0) || (ry == 0)) {
445 /*
446 * if either radii is zero the specified behaviour is a line
447 */
448 return -1;
449 }
450
451 /* obtain the absolute values of the radii */
452 rx = fabsf(rx);
453 ry = fabsf(ry);
454
455 /* convert normalised angle to radians */
456 radangle = degToRad(fmod(angle, 360.0));
457
458 /* step 1 */
459 /* x1,x2 is the midpoint vector rotated to remove the arc angle */
460 rotate_midpoint_vector(start_x, start_y, end_x, end_y, radangle, &x1, &y1);
461
462 /* step 2 */
463 /* get squared x1 values */
464 x1_sq = x1 * x1;
465 y1_sq = y1 * y1;
466
467 /* ensure radii are correctly scaled */
468 ensure_radii_scale(x1_sq, y1_sq, &rx, &ry, &rx_sq, &ry_sq);
469
470 /* compute the transformed centre point */
471 compute_transformed_centre_point(largearc == sweep?-1:1,
472 rx, ry,
473 rx_sq, ry_sq,
474 x1, y1,
475 x1_sq, y1_sq,
476 &cx1, &cy1);
477
478 /* step 3 */
479 /* get the untransformed centre point */
480 compute_centre_point(start_x, start_y,
481 end_x, end_y,
482 cx1, cy1,
483 radangle,
484 &cx, &cy);
485
486 /* step 4 */
487 /* compute anglestart and extent */
488 compute_angle_start_extent(rx,ry,
489 x1,y1,
490 cx1, cy1,
491 &start, &extent);
492
493 /* extent of 0 is a straight line */
494 if (extent == 0) {
495 return -1;
496 }
497
498 /* take account of sweep */
499 if (!sweep && extent > 0) {
500 extent -= TAU;
501 } else if (sweep && extent < 0) {
502 extent += TAU;
503 }
504
505 /* normalise start and extent */
506 extent = fmod(extent, TAU);
507 start = fmod(start, TAU);
508
509 /* convert the arc to unit circle bezier curves */
510 bzsegments = circle_arc_to_bezier(start, extent, bzpoints);
511
512 /* transform the bezier curves */
513 scale_rotate_translate_points(rx, ry,
514 radangle,
515 cx, cy,
516 bzsegments * 6,
517 bzpoints);
518
519 return bzsegments;
520 }
521
522
523 /**
524 * Call this to ref the strings in a gradient state.
525 */
526 static void svgtiny_grad_string_ref(struct svgtiny_parse_state_gradient *grad)
527 {
528 if (grad->gradient_x1 != NULL) {
529 dom_string_ref(grad->gradient_x1);
530 }
531 if (grad->gradient_y1 != NULL) {
532 dom_string_ref(grad->gradient_y1);
533 }
534 if (grad->gradient_x2 != NULL) {
535 dom_string_ref(grad->gradient_x2);
536 }
537 if (grad->gradient_y2 != NULL) {
538 dom_string_ref(grad->gradient_y2);
539 }
540 }
541
542 /**
543 * Call this to clean up the strings in a gradient state.
544 */
545 static void svgtiny_grad_string_cleanup(
546 struct svgtiny_parse_state_gradient *grad)
547 {
548 if (grad->gradient_x1 != NULL) {
549 dom_string_unref(grad->gradient_x1);
550 grad->gradient_x1 = NULL;
551 }
552 if (grad->gradient_y1 != NULL) {
553 dom_string_unref(grad->gradient_y1);
554 grad->gradient_y1 = NULL;
555 }
556 if (grad->gradient_x2 != NULL) {
557 dom_string_unref(grad->gradient_x2);
558 grad->gradient_x2 = NULL;
559 }
560 if (grad->gradient_y2 != NULL) {
561 dom_string_unref(grad->gradient_y2);
562 grad->gradient_y2 = NULL;
563 }
564 }
565
566 /**
567 * Set the local externally-stored parts of a parse state.
568 * Call this in functions that made a new state on the stack.
569 * Doesn't make own copy of global state, such as the interned string list.
570 */
571 static void svgtiny_setup_state_local(struct svgtiny_parse_state *state)
572 {
573 svgtiny_grad_string_ref(&(state->fill_grad));
574 svgtiny_grad_string_ref(&(state->stroke_grad));
575 }
576
577 /**
578 * Cleanup the local externally-stored parts of a parse state.
579 * Call this in functions that made a new state on the stack.
580 * Doesn't cleanup global state, such as the interned string list.
581 */
582 static void svgtiny_cleanup_state_local(struct svgtiny_parse_state *state)
583 {
584 svgtiny_grad_string_cleanup(&(state->fill_grad));
585 svgtiny_grad_string_cleanup(&(state->stroke_grad));
586 }
587
588
589 /**
590 * Create a new svgtiny_diagram structure.
591 */
592
593 struct svgtiny_diagram *svgtiny_create(void)
594 {
595 struct svgtiny_diagram *diagram;
596
597 diagram = calloc(sizeof(*diagram), 1);
598 if (!diagram)
599 return 0;
600
601 return diagram;
602 free(diagram);
603 return NULL;
604 }
605
606 static void ignore_msg(uint32_t severity, void *ctx, const char *msg, ...)
607 {
608 UNUSED(severity);
609 UNUSED(ctx);
610 UNUSED(msg);
611 }
612
613 /**
614 * Parse a block of memory into a svgtiny_diagram.
615 */
616
617 svgtiny_code svgtiny_parse(struct svgtiny_diagram *diagram,
618 const char *buffer, size_t size, const char *url,
619 int viewport_width, int viewport_height)
620 {
621 css_error css_code;
622 dom_document *document;
623 dom_exception exc;
624 dom_xml_parser *parser;
625 dom_xml_error err;
626 dom_element *svg;
627 dom_string *svg_name;
628 lwc_string *svg_name_lwc;
629 struct svgtiny_parse_state state;
630 float x, y, width, height;
631 svgtiny_code code;
632
633 assert(diagram);
634 assert(buffer);
635 assert(url);
636
637 UNUSED(url);
638
639 parser = dom_xml_parser_create(NULL, NULL,
640 ignore_msg, NULL, &document);
641
642 if (parser == NULL)
643 return svgtiny_LIBDOM_ERROR;
644
645 err = dom_xml_parser_parse_chunk(parser, (uint8_t *)buffer, size);
646 if (err != DOM_XML_OK) {
647 dom_node_unref(document);
648 dom_xml_parser_destroy(parser);
649 return svgtiny_LIBDOM_ERROR;
650 }
651
652 err = dom_xml_parser_completed(parser);
653 if (err != DOM_XML_OK) {
654 dom_node_unref(document);
655 dom_xml_parser_destroy(parser);
656 return svgtiny_LIBDOM_ERROR;
657 }
658
659 /* We're done parsing, drop the parser.
660 * We now own the document entirely.
661 */
662 dom_xml_parser_destroy(parser);
663
664 /* find root <svg> element */
665 exc = dom_document_get_document_element(document, &svg);
666 if (exc != DOM_NO_ERR) {
667 dom_node_unref(document);
668 return svgtiny_LIBDOM_ERROR;
669 }
670 if (svg == NULL) {
671 /* no root svg element */
672 dom_node_unref(document);
673 return svgtiny_SVG_ERROR;
674 }
675
676 exc = dom_node_get_node_name(svg, &svg_name);
677 if (exc != DOM_NO_ERR) {
678 dom_node_unref(svg);
679 dom_node_unref(document);
680 return svgtiny_LIBDOM_ERROR;
681 }
682 if (lwc_intern_string("svg", 3 /* SLEN("svg") */,
683 &svg_name_lwc) != lwc_error_ok) {
684 dom_string_unref(svg_name);
685 dom_node_unref(svg);
686 dom_node_unref(document);
687 return svgtiny_LIBDOM_ERROR;
688 }
689 if (!dom_string_caseless_lwc_isequal(svg_name, svg_name_lwc)) {
690 lwc_string_unref(svg_name_lwc);
691 dom_string_unref(svg_name);
692 dom_node_unref(svg);
693 dom_node_unref(document);
694 return svgtiny_NOT_SVG;
695 }
696
697 lwc_string_unref(svg_name_lwc);
698 dom_string_unref(svg_name);
699
700 /* get graphic dimensions */
701 memset(&state, 0, sizeof(state));
702 state.diagram = diagram;
703 state.document = document;
704 state.viewport_width = viewport_width;
705 state.viewport_height = viewport_height;
706
707
708 /* Initialize CSS context */
709 if (state.select_ctx == NULL) {
710 css_code = css_select_ctx_create(&state.select_ctx);
711 if (css_code != CSS_OK) {
712 dom_node_unref(svg);
713 dom_node_unref(document);
714 return svgtiny_LIBCSS_ERROR;
715 }
716 }
717
718 #define SVGTINY_STRING_ACTION2(s,n) \
719 if (dom_string_create_interned((const uint8_t *) #n, \
720 strlen(#n), &state.interned_##s) \
721 != DOM_NO_ERR) { \
722 code = svgtiny_LIBDOM_ERROR; \
723 goto cleanup; \
724 }
725 #include "svgtiny_strings.h"
726 #undef SVGTINY_STRING_ACTION2
727
728 /* Intern SVG's xmlns separately because it's an lwc_string
729 * and not a dom_string. We initialize its pointer to NULL
730 * because the "cleanup:" test to see if it needs to be free'd
731 * looks for NULL. Returning a LIBDOM_ERROR on failure is not
732 * perfect but it's the closest of the available options. */
733 state.interned_svg_xmlns = NULL;
734 if (lwc_intern_string("http://www.w3.org/2000/svg",
735 26,
736 &state.interned_svg_xmlns) != lwc_error_ok) {
737 code = svgtiny_LIBDOM_ERROR;
738 goto cleanup;
739 }
740
741 svgtiny_parse_position_attributes(svg, state, &x, &y, &width, &height);
742 diagram->width = width;
743 diagram->height = height;
744
745 /* set up parsing state */
746 state.viewport_width = width;
747 state.viewport_height = height;
748 state.ctm.a = 1; /*(float) viewport_width / (float) width;*/
749 state.ctm.b = 0;
750 state.ctm.c = 0;
751 state.ctm.d = 1; /*(float) viewport_height / (float) height;*/
752 state.ctm.e = 0; /*x;*/
753 state.ctm.f = 0; /*y;*/
754 state.fill = 0x000000;
755 state.stroke = svgtiny_TRANSPARENT;
756 state.stroke_width = 1;
757
758 /* parse tree */
759 code = svgtiny_preparse_styles(svg, state);
760 if (code == svgtiny_OK) {
761 code = svgtiny_parse_svg(svg, state);
762 }
763
764 dom_node_unref(svg);
765 dom_node_unref(document);
766 css_code = css_select_ctx_destroy(state.select_ctx);
767 if (css_code != CSS_OK) {
768 code = svgtiny_LIBCSS_ERROR;
769 }
770
771 cleanup:
772 svgtiny_cleanup_state_local(&state);
773 #define SVGTINY_STRING_ACTION2(s,n) \
774 if (state.interned_##s != NULL) \
775 dom_string_unref(state.interned_##s);
776 #include "svgtiny_strings.h"
777 #undef SVGTINY_STRING_ACTION2
778
779 if (state.interned_svg_xmlns != NULL) {
780 lwc_string_unref(state.interned_svg_xmlns);
781 }
782
783 return code;
784 }
785
786
787 /**
788 * Parse a single <style> element, appending the result to the CSS
789 * select context within the given parser state.
790 */
791 svgtiny_code svgtiny_parse_style_element(dom_element *style,
792 struct svgtiny_parse_state state)
793 {
794 css_stylesheet *sheet;
795 css_error code;
796 dom_exception exc;
797
798 code = svgtiny_create_stylesheet(&sheet, false);
799 if (code != CSS_OK) {
800 return svgtiny_LIBCSS_ERROR;
801 }
802
803 /* Parse the style element's "media" attribute if it has
804 one. We don't do anything with it right now. */
805 dom_string *media_attr;
806 exc = dom_element_get_attribute(style, state.interned_media,
807 &media_attr);
808 if (exc != DOM_NO_ERR) {
809 css_stylesheet_destroy(sheet);
810 return svgtiny_LIBDOM_ERROR;
811 }
812
813 if (media_attr) {
814 /* Here's where we'd actually change the media type if
815 we were going to use it */
816 dom_string_unref(media_attr);
817 }
818
819 dom_string *data;
820 dom_node_get_text_content(style, &data);
821 if (data == NULL) {
822 /* Empty stylesheet? That's fine. */
823 css_stylesheet_destroy(sheet);
824 return svgtiny_OK;
825 }
826
827 code = css_stylesheet_append_data(sheet,
828 (uint8_t *)dom_string_data(data),
829 dom_string_byte_length(data));
830 if (code != CSS_OK && code != CSS_NEEDDATA) {
831 dom_string_unref(data);
832 css_stylesheet_destroy(sheet);
833 return svgtiny_LIBCSS_ERROR;
834 }
835
836 code = css_stylesheet_data_done(sheet);
837 if (code != CSS_OK) {
838 dom_string_unref(data);
839 css_stylesheet_destroy(sheet);
840 return svgtiny_LIBCSS_ERROR;
841 }
842
843 code = css_select_ctx_append_sheet(state.select_ctx,
844 sheet,
845 CSS_ORIGIN_AUTHOR,
846 NULL);
847 if (code != CSS_OK) {
848 dom_string_unref(data);
849 return svgtiny_LIBCSS_ERROR;
850 }
851
852 dom_string_unref(data);
853 return svgtiny_OK;
854 }
855
856
857 /**
858 * Parse the contents of an inline style and return (a pointer to) the
859 * corresponding stylesheet for use with css_select_style(). Returns
860 * NULL if anything goes wrong.
861 */
862 css_stylesheet *svgtiny_parse_style_inline(const uint8_t *data,
863 size_t len)
864 {
865 css_stylesheet *sheet;
866 css_error code;
867
868 code = svgtiny_create_stylesheet(&sheet, true);
869 if (code != CSS_OK) {
870 return NULL;
871 }
872
873 code = css_stylesheet_append_data(sheet, data, len);
874 if (code != CSS_OK && code != CSS_NEEDDATA) {
875 css_stylesheet_destroy(sheet);
876 return NULL;
877 }
878
879 code = css_stylesheet_data_done(sheet);
880 if (code != CSS_OK) {
881 css_stylesheet_destroy(sheet);
882 return NULL;
883 }
884
885 return sheet;
886 }
887
888 /**
889 * Parse all <style> elements within a root <svg> element. This
890 * should be called before svgtiny_parse_svg() because that function
891 * makes a single pass through the document and we'd like all style
892 * information to be available during that pass. Specifically, we'd
893 * like a <style> sheet at the end of the document to affect the
894 * rendering of elements at its beginning.
895 *
896 * The element-parsing inner loop here is essentially the same as
897 * that within svgtiny_parse_svg().
898 */
899 svgtiny_code svgtiny_preparse_styles(dom_element *svg,
900 struct svgtiny_parse_state state)
901 {
902 dom_element *child;
903 dom_exception exc;
904
905 exc = dom_node_get_first_child(svg, (dom_node **) (void *) &child);
906 if (exc != DOM_NO_ERR) {
907 return svgtiny_LIBDOM_ERROR;
908 }
909 while (child != NULL) {
910 dom_element *next;
911 dom_node_type nodetype;
912 svgtiny_code code = svgtiny_OK;
913
914 exc = dom_node_get_node_type(child, &nodetype);
915 if (exc != DOM_NO_ERR) {
916 dom_node_unref(child);
917 return svgtiny_LIBDOM_ERROR;
918 }
919 if (nodetype == DOM_ELEMENT_NODE) {
920 dom_string *nodename;
921 exc = dom_node_get_node_name(child, &nodename);
922 if (exc != DOM_NO_ERR) {
923 dom_node_unref(child);
924 return svgtiny_LIBDOM_ERROR;
925 }
926
927 if (dom_string_caseless_isequal(state.interned_style,
928 nodename)) {
929 /* We have a <style> element, parse it */
930 code = svgtiny_parse_style_element(child,
931 state);
932 }
933
934
935 dom_string_unref(nodename);
936 }
937 if (code != svgtiny_OK) {
938 dom_node_unref(child);
939 return code;
940 }
941 exc = dom_node_get_next_sibling(child,
942 (dom_node **) (void *) &next);
943 dom_node_unref(child);
944 if (exc != DOM_NO_ERR) {
945 return svgtiny_LIBDOM_ERROR;
946 }
947 child = next;
948 }
949
950 return svgtiny_OK;
951 }
952
953 /**
954 * Parse a <svg> or <g> element node.
955 */
956
957 svgtiny_code svgtiny_parse_svg(dom_element *svg,
958 struct svgtiny_parse_state state)
959 {
960 float x, y, width, height;
961 dom_string *view_box;
962 dom_element *child;
963 dom_exception exc;
964
965 svgtiny_setup_state_local(&state);
966
967 svgtiny_parse_position_attributes(svg, state, &x, &y, &width, &height);
968 svgtiny_parse_paint_attributes(svg, &state);
969 svgtiny_parse_font_attributes(svg, &state);
970
971 exc = dom_element_get_attribute(svg, state.interned_viewBox,
972 &view_box);
973 if (exc != DOM_NO_ERR) {
974 svgtiny_cleanup_state_local(&state);
975 return svgtiny_LIBDOM_ERROR;
976 }
977
978 if (view_box) {
979 char *s = strndup(dom_string_data(view_box),
980 dom_string_byte_length(view_box));
981 float min_x, min_y, vwidth, vheight;
982 if (sscanf(s, "%f,%f,%f,%f",
983 &min_x, &min_y, &vwidth, &vheight) == 4 ||
984 sscanf(s, "%f %f %f %f",
985 &min_x, &min_y, &vwidth, &vheight) == 4) {
986 state.ctm.a = (float) state.viewport_width / vwidth;
987 state.ctm.d = (float) state.viewport_height / vheight;
988 state.ctm.e += -min_x * state.ctm.a;
989 state.ctm.f += -min_y * state.ctm.d;
990 }
991 free(s);
992 dom_string_unref(view_box);
993 }
994
995 svgtiny_parse_transform_attributes(svg, &state);
996
997 exc = dom_node_get_first_child(svg, (dom_node **) (void *) &child);
998 if (exc != DOM_NO_ERR) {
999 svgtiny_cleanup_state_local(&state);
1000 return svgtiny_LIBDOM_ERROR;
1001 }
1002 while (child != NULL) {
1003 dom_element *next;
1004 dom_node_type nodetype;
1005 svgtiny_code code = svgtiny_OK;
1006
1007 exc = dom_node_get_node_type(child, &nodetype);
1008 if (exc != DOM_NO_ERR) {
1009 dom_node_unref(child);
1010 return svgtiny_LIBDOM_ERROR;
1011 }
1012 if (nodetype == DOM_ELEMENT_NODE) {
1013 dom_string *nodename;
1014 exc = dom_node_get_node_name(child, &nodename);
1015 if (exc != DOM_NO_ERR) {
1016 dom_node_unref(child);
1017 svgtiny_cleanup_state_local(&state);
1018 return svgtiny_LIBDOM_ERROR;
1019 }
1020 if (dom_string_caseless_isequal(state.interned_svg,
1021 nodename))
1022 code = svgtiny_parse_svg(child, state);
1023 else if (dom_string_caseless_isequal(state.interned_g,
1024 nodename))
1025 code = svgtiny_parse_svg(child, state);
1026 else if (dom_string_caseless_isequal(state.interned_a,
1027 nodename))
1028 code = svgtiny_parse_svg(child, state);
1029 else if (dom_string_caseless_isequal(state.interned_path,
1030 nodename))
1031 code = svgtiny_parse_path(child, state);
1032 else if (dom_string_caseless_isequal(state.interned_rect,
1033 nodename))
1034 code = svgtiny_parse_rect(child, state);
1035 else if (dom_string_caseless_isequal(state.interned_circle,
1036 nodename))
1037 code = svgtiny_parse_circle(child, state);
1038 else if (dom_string_caseless_isequal(state.interned_ellipse,
1039 nodename))
1040 code = svgtiny_parse_ellipse(child, state);
1041 else if (dom_string_caseless_isequal(state.interned_line,
1042 nodename))
1043 code = svgtiny_parse_line(child, state);
1044 else if (dom_string_caseless_isequal(state.interned_polyline,
1045 nodename))
1046 code = svgtiny_parse_poly(child, state, false);
1047 else if (dom_string_caseless_isequal(state.interned_polygon,
1048 nodename))
1049 code = svgtiny_parse_poly(child, state, true);
1050 else if (dom_string_caseless_isequal(state.interned_text,
1051 nodename))
1052 code = svgtiny_parse_text(child, state);
1053 dom_string_unref(nodename);
1054 }
1055 if (code != svgtiny_OK) {
1056 dom_node_unref(child);
1057 svgtiny_cleanup_state_local(&state);
1058 return code;
1059 }
1060 exc = dom_node_get_next_sibling(child,
1061 (dom_node **) (void *) &next);
1062 dom_node_unref(child);
1063 if (exc != DOM_NO_ERR) {
1064 svgtiny_cleanup_state_local(&state);
1065 return svgtiny_LIBDOM_ERROR;
1066 }
1067 child = next;
1068 }
1069
1070 svgtiny_cleanup_state_local(&state);
1071 return svgtiny_OK;
1072 }
1073
1074
1075
1076 /**
1077 * Parse a <path> element node.
1078 *
1079 * http://www.w3.org/TR/SVG11/paths#PathElement
1080 */
1081
1082 svgtiny_code svgtiny_parse_path(dom_element *path,
1083 struct svgtiny_parse_state state)
1084 {
1085 svgtiny_code err;
1086 dom_string *path_d_str;
1087 dom_exception exc;
1088 char *s, *path_d;
1089 float *p; /* path elemets */
1090 unsigned int palloc; /* number of path elements allocated */
1091 unsigned int i;
1092 float last_x = 0, last_y = 0;
1093 float last_cubic_x = 0, last_cubic_y = 0;
1094 float last_quad_x = 0, last_quad_y = 0;
1095 float subpath_first_x = 0, subpath_first_y = 0;
1096
1097 svgtiny_setup_state_local(&state);
1098
1099 svgtiny_parse_paint_attributes(path, &state);
1100 svgtiny_parse_transform_attributes(path, &state);
1101
1102 /* read d attribute */
1103 exc = dom_element_get_attribute(path, state.interned_d, &path_d_str);
1104 if (exc != DOM_NO_ERR) {
1105 state.diagram->error_line = -1; /* path->line; */
1106 state.diagram->error_message = "path: error retrieving d attribute";
1107 svgtiny_cleanup_state_local(&state);
1108 return svgtiny_SVG_ERROR;
1109 }
1110
1111 if (path_d_str == NULL) {
1112 state.diagram->error_line = -1; /* path->line; */
1113 state.diagram->error_message = "path: missing d attribute";
1114 svgtiny_cleanup_state_local(&state);
1115 return svgtiny_SVG_ERROR;
1116 }
1117
1118 /* empty path is permitted it just disables the path */
1119 palloc = dom_string_byte_length(path_d_str);
1120 if (palloc == 0) {
1121 dom_string_unref(path_d_str);
1122 svgtiny_cleanup_state_local(&state);
1123 return svgtiny_OK;
1124 }
1125
1126 /* local copy of the path data allowing in-place modification */
1127 s = path_d = strndup(dom_string_data(path_d_str), palloc);
1128 dom_string_unref(path_d_str);
1129 if (s == NULL) {
1130 svgtiny_cleanup_state_local(&state);
1131 return svgtiny_OUT_OF_MEMORY;
1132 }
1133
1134 /* ensure path element allocation is sensibly bounded */
1135 if (palloc < 8) {
1136 palloc = 8;
1137 } else if (palloc > 64) {
1138 palloc = palloc / 2;
1139 }
1140
1141 /* allocate initial space for path elements */
1142 p = malloc(sizeof p[0] * palloc);
1143 if (p == NULL) {
1144 free(path_d);
1145 svgtiny_cleanup_state_local(&state);
1146 return svgtiny_OUT_OF_MEMORY;
1147 }
1148
1149 /* parse d and build path */
1150 for (i = 0; s[i]; i++)
1151 if (s[i] == ',')
1152 s[i] = ' ';
1153 i = 0;
1154 while (*s) {
1155 char command[2];
1156 int plot_command;
1157 float x, y, x1, y1, x2, y2, rx, ry, rotation, large_arc, sweep;
1158 int n;
1159
1160 /* Ensure there is sufficient space for path elements */
1161 #define ALLOC_PATH_ELEMENTS(NUM_ELEMENTS) \
1162 do { \
1163 if ((palloc - i) < NUM_ELEMENTS) { \
1164 float *tp; \
1165 palloc = (palloc * 2) + (palloc / 2); \
1166 tp = realloc(p, sizeof p[0] * palloc); \
1167 if (tp == NULL) { \
1168 free(p); \
1169 free(path_d); \
1170 svgtiny_cleanup_state_local(&state); \
1171 return svgtiny_OUT_OF_MEMORY; \
1172 } \
1173 p = tp; \
1174 } \
1175 } while(0)
1176
1177
1178 /* moveto (M, m), lineto (L, l) (2 arguments) */
1179 if (sscanf(s, " %1[MmLl] %f %f %n", command, &x, &y, &n) == 3) {
1180 /*LOG(("moveto or lineto"));*/
1181 if (*command == 'M' || *command == 'm')
1182 plot_command = svgtiny_PATH_MOVE;
1183 else
1184 plot_command = svgtiny_PATH_LINE;
1185 do {
1186 ALLOC_PATH_ELEMENTS(3);
1187 p[i++] = plot_command;
1188 if ('a' <= *command) {
1189 x += last_x;
1190 y += last_y;
1191 }
1192 if (plot_command == svgtiny_PATH_MOVE) {
1193 subpath_first_x = x;
1194 subpath_first_y = y;
1195 }
1196 p[i++] = last_cubic_x = last_quad_x = last_x
1197 = x;
1198 p[i++] = last_cubic_y = last_quad_y = last_y
1199 = y;
1200 s += n;
1201 plot_command = svgtiny_PATH_LINE;
1202 } while (sscanf(s, "%f %f %n", &x, &y, &n) == 2);
1203
1204 /* closepath (Z, z) (no arguments) */
1205 } else if (sscanf(s, " %1[Zz] %n", command, &n) == 1) {
1206 /*LOG(("closepath"));*/
1207 ALLOC_PATH_ELEMENTS(1);
1208
1209 p[i++] = svgtiny_PATH_CLOSE;
1210 s += n;
1211 last_cubic_x = last_quad_x = last_x = subpath_first_x;
1212 last_cubic_y = last_quad_y = last_y = subpath_first_y;
1213
1214 /* horizontal lineto (H, h) (1 argument) */
1215 } else if (sscanf(s, " %1[Hh] %f %n", command, &x, &n) == 2) {
1216 /*LOG(("horizontal lineto"));*/
1217 do {
1218 ALLOC_PATH_ELEMENTS(3);
1219
1220 p[i++] = svgtiny_PATH_LINE;
1221 if (*command == 'h')
1222 x += last_x;
1223 p[i++] = last_cubic_x = last_quad_x = last_x
1224 = x;
1225 p[i++] = last_cubic_y = last_quad_y = last_y;
1226 s += n;
1227 } while (sscanf(s, "%f %n", &x, &n) == 1);
1228
1229 /* vertical lineto (V, v) (1 argument) */
1230 } else if (sscanf(s, " %1[Vv] %f %n", command, &y, &n) == 2) {
1231 /*LOG(("vertical lineto"));*/
1232 do {
1233 ALLOC_PATH_ELEMENTS(3);
1234
1235 p[i++] = svgtiny_PATH_LINE;
1236 if (*command == 'v')
1237 y += last_y;
1238 p[i++] = last_cubic_x = last_quad_x = last_x;
1239 p[i++] = last_cubic_y = last_quad_y = last_y
1240 = y;
1241 s += n;
1242 } while (sscanf(s, "%f %n", &y, &n) == 1);
1243
1244 /* curveto (C, c) (6 arguments) */
1245 } else if (sscanf(s, " %1[Cc] %f %f %f %f %f %f %n", command,
1246 &x1, &y1, &x2, &y2, &x, &y, &n) == 7) {
1247 /*LOG(("curveto"));*/
1248 do {
1249 ALLOC_PATH_ELEMENTS(7);
1250
1251 p[i++] = svgtiny_PATH_BEZIER;
1252 if (*command == 'c') {
1253 x1 += last_x;
1254 y1 += last_y;
1255 x2 += last_x;
1256 y2 += last_y;
1257 x += last_x;
1258 y += last_y;
1259 }
1260 p[i++] = x1;
1261 p[i++] = y1;
1262 p[i++] = last_cubic_x = x2;
1263 p[i++] = last_cubic_y = y2;
1264 p[i++] = last_quad_x = last_x = x;
1265 p[i++] = last_quad_y = last_y = y;
1266 s += n;
1267 } while (sscanf(s, "%f %f %f %f %f %f %n",
1268 &x1, &y1, &x2, &y2, &x, &y, &n) == 6);
1269
1270 /* shorthand/smooth curveto (S, s) (4 arguments) */
1271 } else if (sscanf(s, " %1[Ss] %f %f %f %f %n", command,
1272 &x2, &y2, &x, &y, &n) == 5) {
1273 /*LOG(("shorthand/smooth curveto"));*/
1274 do {
1275 ALLOC_PATH_ELEMENTS(7);
1276
1277 p[i++] = svgtiny_PATH_BEZIER;
1278 x1 = last_x + (last_x - last_cubic_x);
1279 y1 = last_y + (last_y - last_cubic_y);
1280 if (*command == 's') {
1281 x2 += last_x;
1282 y2 += last_y;
1283 x += last_x;
1284 y += last_y;
1285 }
1286 p[i++] = x1;
1287 p[i++] = y1;
1288 p[i++] = last_cubic_x = x2;
1289 p[i++] = last_cubic_y = y2;
1290 p[i++] = last_quad_x = last_x = x;
1291 p[i++] = last_quad_y = last_y = y;
1292 s += n;
1293 } while (sscanf(s, "%f %f %f %f %n",
1294 &x2, &y2, &x, &y, &n) == 4);
1295
1296 /* quadratic Bezier curveto (Q, q) (4 arguments) */
1297 } else if (sscanf(s, " %1[Qq] %f %f %f %f %n", command,
1298 &x1, &y1, &x, &y, &n) == 5) {
1299 /*LOG(("quadratic Bezier curveto"));*/
1300 do {
1301 ALLOC_PATH_ELEMENTS(7);
1302
1303 p[i++] = svgtiny_PATH_BEZIER;
1304 last_quad_x = x1;
1305 last_quad_y = y1;
1306 if (*command == 'q') {
1307 x1 += last_x;
1308 y1 += last_y;
1309 x += last_x;
1310 y += last_y;
1311 }
1312 p[i++] = 1./3 * last_x + 2./3 * x1;
1313 p[i++] = 1./3 * last_y + 2./3 * y1;
1314 p[i++] = 2./3 * x1 + 1./3 * x;
1315 p[i++] = 2./3 * y1 + 1./3 * y;
1316 p[i++] = last_cubic_x = last_x = x;
1317 p[i++] = last_cubic_y = last_y = y;
1318 s += n;
1319 } while (sscanf(s, "%f %f %f %f %n",
1320 &x1, &y1, &x, &y, &n) == 4);
1321
1322 /* shorthand/smooth quadratic Bezier curveto (T, t)
1323 (2 arguments) */
1324 } else if (sscanf(s, " %1[Tt] %f %f %n", command,
1325 &x, &y, &n) == 3) {
1326 /*LOG(("shorthand/smooth quadratic Bezier curveto"));*/
1327 do {
1328 ALLOC_PATH_ELEMENTS(7);
1329
1330 p[i++] = svgtiny_PATH_BEZIER;
1331 x1 = last_x + (last_x - last_quad_x);
1332 y1 = last_y + (last_y - last_quad_y);
1333 last_quad_x = x1;
1334 last_quad_y = y1;
1335 if (*command == 't') {
1336 x1 += last_x;
1337 y1 += last_y;
1338 x += last_x;
1339 y += last_y;
1340 }
1341 p[i++] = 1./3 * last_x + 2./3 * x1;
1342 p[i++] = 1./3 * last_y + 2./3 * y1;
1343 p[i++] = 2./3 * x1 + 1./3 * x;
1344 p[i++] = 2./3 * y1 + 1./3 * y;
1345 p[i++] = last_cubic_x = last_x = x;
1346 p[i++] = last_cubic_y = last_y = y;
1347 s += n;
1348 } while (sscanf(s, "%f %f %n",
1349 &x, &y, &n) == 2);
1350
1351 /* elliptical arc (A, a) (7 arguments) */
1352 } else if (sscanf(s, " %1[Aa] %f %f %f %f %f %f %f %n", command,
1353 &rx, &ry, &rotation, &large_arc, &sweep,
1354 &x, &y, &n) == 8) {
1355 do {
1356 int bzsegments;
1357 double bzpoints[6*4]; /* allow for up to four bezier segments per arc */
1358
1359 if (*command == 'a') {
1360 x += last_x;
1361 y += last_y;
1362 }
1363
1364 bzsegments = svgarc_to_bezier(last_x, last_y,
1365 x, y,
1366 rx, ry,
1367 rotation,
1368 large_arc,
1369 sweep,
1370 bzpoints);
1371 if (bzsegments == -1) {
1372 /* draw a line */
1373 ALLOC_PATH_ELEMENTS(3);
1374 p[i++] = svgtiny_PATH_LINE;
1375 p[i++] = x;
1376 p[i++] = y;
1377 } else if (bzsegments > 0) {
1378 int bzpnt;
1379 ALLOC_PATH_ELEMENTS((unsigned int)bzsegments * 7);
1380 for (bzpnt = 0;bzpnt < (bzsegments * 6); bzpnt+=6) {
1381 p[i++] = svgtiny_PATH_BEZIER;
1382 p[i++] = bzpoints[bzpnt];
1383 p[i++] = bzpoints[bzpnt+1];
1384 p[i++] = bzpoints[bzpnt+2];
1385 p[i++] = bzpoints[bzpnt+3];
1386 p[i++] = bzpoints[bzpnt+4];
1387 p[i++] = bzpoints[bzpnt+5];
1388 }
1389 }
1390 if (bzsegments != 0) {
1391 last_cubic_x = last_quad_x = last_x = p[i-2];
1392 last_cubic_y = last_quad_y = last_y = p[i-1];
1393 }
1394
1395
1396 s += n;
1397 } while (sscanf(s, "%f %f %f %f %f %f %f %n",
1398 &rx, &ry, &rotation, &large_arc, &sweep,
1399 &x, &y, &n) == 7);
1400
1401 } else {
1402 /* fprintf(stderr, "parse failed at \"%s\"\n", s); */
1403 break;
1404 }
1405 }
1406
1407 free(path_d);
1408
1409 if (i <= 4) {
1410 /* no real segments in path */
1411 free(p);
1412 svgtiny_cleanup_state_local(&state);
1413 return svgtiny_OK;
1414 }
1415
1416 /* resize path element array to not be over allocated */
1417 if (palloc != i) {
1418 float *tp;
1419
1420 /* try the resize, if it fails just continue to use the old
1421 * allocation
1422 */
1423 tp = realloc(p, sizeof p[0] * i);
1424 if (tp != NULL) {
1425 p = tp;
1426 }
1427 }
1428
1429 err = svgtiny_add_path(p, i, &state);
1430
1431 svgtiny_cleanup_state_local(&state);
1432
1433 return err;
1434 }
1435
1436
1437 /**
1438 * Parse a <rect> element node.
1439 *
1440 * http://www.w3.org/TR/SVG11/shapes#RectElement
1441 */
1442
1443 svgtiny_code svgtiny_parse_rect(dom_element *rect,
1444 struct svgtiny_parse_state state)
1445 {
1446 svgtiny_code err;
1447 float x, y, width, height;
1448 float *p;
1449
1450 svgtiny_setup_state_local(&state);
1451
1452 svgtiny_parse_position_attributes(rect, state,
1453 &x, &y, &width, &height);
1454 svgtiny_parse_paint_attributes(rect, &state);
1455 svgtiny_parse_transform_attributes(rect, &state);
1456
1457 p = malloc(13 * sizeof p[0]);
1458 if (!p) {
1459 svgtiny_cleanup_state_local(&state);
1460 return svgtiny_OUT_OF_MEMORY;
1461 }
1462
1463 p[0] = svgtiny_PATH_MOVE;
1464 p[1] = x;
1465 p[2] = y;
1466 p[3] = svgtiny_PATH_LINE;
1467 p[4] = x + width;
1468 p[5] = y;
1469 p[6] = svgtiny_PATH_LINE;
1470 p[7] = x + width;
1471 p[8] = y + height;
1472 p[9] = svgtiny_PATH_LINE;
1473 p[10] = x;
1474 p[11] = y + height;
1475 p[12] = svgtiny_PATH_CLOSE;
1476
1477 err = svgtiny_add_path(p, 13, &state);
1478
1479 svgtiny_cleanup_state_local(&state);
1480
1481 return err;
1482 }
1483
1484
1485 /**
1486 * Parse a <circle> element node.
1487 */
1488
1489 svgtiny_code svgtiny_parse_circle(dom_element *circle,
1490 struct svgtiny_parse_state state)
1491 {
1492 svgtiny_code err;
1493 float x = 0, y = 0, r = -1;
1494 float *p;
1495 dom_string *attr;
1496 dom_exception exc;
1497
1498 svgtiny_setup_state_local(&state);
1499
1500 exc = dom_element_get_attribute(circle, state.interned_cx, &attr);
1501 if (exc != DOM_NO_ERR) {
1502 svgtiny_cleanup_state_local(&state);
1503 return svgtiny_LIBDOM_ERROR;
1504 }
1505 if (attr != NULL) {
1506 x = svgtiny_parse_length(attr, state.viewport_width, state);
1507 }
1508 dom_string_unref(attr);
1509
1510 exc = dom_element_get_attribute(circle, state.interned_cy, &attr);
1511 if (exc != DOM_NO_ERR) {
1512 svgtiny_cleanup_state_local(&state);
1513 return svgtiny_LIBDOM_ERROR;
1514 }
1515 if (attr != NULL) {
1516 y = svgtiny_parse_length(attr, state.viewport_height, state);
1517 }
1518 dom_string_unref(attr);
1519
1520 exc = dom_element_get_attribute(circle, state.interned_r, &attr);
1521 if (exc != DOM_NO_ERR) {
1522 svgtiny_cleanup_state_local(&state);
1523 return svgtiny_LIBDOM_ERROR;
1524 }
1525 if (attr != NULL) {
1526 r = svgtiny_parse_length(attr, state.viewport_width, state);
1527 }
1528 dom_string_unref(attr);
1529
1530 svgtiny_parse_paint_attributes(circle, &state);
1531 svgtiny_parse_transform_attributes(circle, &state);
1532
1533 if (r < 0) {
1534 state.diagram->error_line = -1; /* circle->line; */
1535 state.diagram->error_message = "circle: r missing or negative";
1536 svgtiny_cleanup_state_local(&state);
1537 return svgtiny_SVG_ERROR;
1538 }
1539 if (r == 0) {
1540 svgtiny_cleanup_state_local(&state);
1541 return svgtiny_OK;
1542 }
1543
1544 p = malloc(32 * sizeof p[0]);
1545 if (!p) {
1546 svgtiny_cleanup_state_local(&state);
1547 return svgtiny_OUT_OF_MEMORY;
1548 }
1549
1550 p[0] = svgtiny_PATH_MOVE;
1551 p[1] = x + r;
1552 p[2] = y;
1553 p[3] = svgtiny_PATH_BEZIER;
1554 p[4] = x + r;
1555 p[5] = y + r * KAPPA;
1556 p[6] = x + r * KAPPA;
1557 p[7] = y + r;
1558 p[8] = x;
1559 p[9] = y + r;
1560 p[10] = svgtiny_PATH_BEZIER;
1561 p[11] = x - r * KAPPA;
1562 p[12] = y + r;
1563 p[13] = x - r;
1564 p[14] = y + r * KAPPA;
1565 p[15] = x - r;
1566 p[16] = y;
1567 p[17] = svgtiny_PATH_BEZIER;
1568 p[18] = x - r;
1569 p[19] = y - r * KAPPA;
1570 p[20] = x - r * KAPPA;
1571 p[21] = y - r;
1572 p[22] = x;
1573 p[23] = y - r;
1574 p[24] = svgtiny_PATH_BEZIER;
1575 p[25] = x + r * KAPPA;
1576 p[26] = y - r;
1577 p[27] = x + r;
1578 p[28] = y - r * KAPPA;
1579 p[29] = x + r;
1580 p[30] = y;
1581 p[31] = svgtiny_PATH_CLOSE;
1582
1583 err = svgtiny_add_path(p, 32, &state);
1584
1585 svgtiny_cleanup_state_local(&state);
1586
1587 return err;
1588 }
1589
1590
1591 /**
1592 * Parse an <ellipse> element node.
1593 */
1594
1595 svgtiny_code svgtiny_parse_ellipse(dom_element *ellipse,
1596 struct svgtiny_parse_state state)
1597 {
1598 svgtiny_code err;
1599 float x = 0, y = 0, rx = -1, ry = -1;
1600 float *p;
1601 dom_string *attr;
1602 dom_exception exc;
1603
1604 svgtiny_setup_state_local(&state);
1605
1606 exc = dom_element_get_attribute(ellipse, state.interned_cx, &attr);
1607 if (exc != DOM_NO_ERR) {
1608 svgtiny_cleanup_state_local(&state);
1609 return svgtiny_LIBDOM_ERROR;
1610 }
1611 if (attr != NULL) {
1612 x = svgtiny_parse_length(attr, state.viewport_width, state);
1613 }
1614 dom_string_unref(attr);
1615
1616 exc = dom_element_get_attribute(ellipse, state.interned_cy, &attr);
1617 if (exc != DOM_NO_ERR) {
1618 svgtiny_cleanup_state_local(&state);
1619 return svgtiny_LIBDOM_ERROR;
1620 }
1621 if (attr != NULL) {
1622 y = svgtiny_parse_length(attr, state.viewport_height, state);
1623 }
1624 dom_string_unref(attr);
1625
1626 exc = dom_element_get_attribute(ellipse, state.interned_rx, &attr);
1627 if (exc != DOM_NO_ERR) {
1628 svgtiny_cleanup_state_local(&state);
1629 return svgtiny_LIBDOM_ERROR;
1630 }
1631 if (attr != NULL) {
1632 rx = svgtiny_parse_length(attr, state.viewport_width, state);
1633 }
1634 dom_string_unref(attr);
1635
1636 exc = dom_element_get_attribute(ellipse, state.interned_ry, &attr);
1637 if (exc != DOM_NO_ERR) {
1638 svgtiny_cleanup_state_local(&state);
1639 return svgtiny_LIBDOM_ERROR;
1640 }
1641 if (attr != NULL) {
1642 ry = svgtiny_parse_length(attr, state.viewport_width, state);
1643 }
1644 dom_string_unref(attr);
1645
1646 svgtiny_parse_paint_attributes(ellipse, &state);
1647 svgtiny_parse_transform_attributes(ellipse, &state);
1648
1649 if (rx < 0 || ry < 0) {
1650 state.diagram->error_line = -1; /* ellipse->line; */
1651 state.diagram->error_message = "ellipse: rx or ry missing "
1652 "or negative";
1653 svgtiny_cleanup_state_local(&state);
1654 return svgtiny_SVG_ERROR;
1655 }
1656 if (rx == 0 || ry == 0) {
1657 svgtiny_cleanup_state_local(&state);
1658 return svgtiny_OK;
1659 }
1660
1661 p = malloc(32 * sizeof p[0]);
1662 if (!p) {
1663 svgtiny_cleanup_state_local(&state);
1664 return svgtiny_OUT_OF_MEMORY;
1665 }
1666
1667 p[0] = svgtiny_PATH_MOVE;
1668 p[1] = x + rx;
1669 p[2] = y;
1670 p[3] = svgtiny_PATH_BEZIER;
1671 p[4] = x + rx;
1672 p[5] = y + ry * KAPPA;
1673 p[6] = x + rx * KAPPA;
1674 p[7] = y + ry;
1675 p[8] = x;
1676 p[9] = y + ry;
1677 p[10] = svgtiny_PATH_BEZIER;
1678 p[11] = x - rx * KAPPA;
1679 p[12] = y + ry;
1680 p[13] = x - rx;
1681 p[14] = y + ry * KAPPA;
1682 p[15] = x - rx;
1683 p[16] = y;
1684 p[17] = svgtiny_PATH_BEZIER;
1685 p[18] = x - rx;
1686 p[19] = y - ry * KAPPA;
1687 p[20] = x - rx * KAPPA;
1688 p[21] = y - ry;
1689 p[22] = x;
1690 p[23] = y - ry;
1691 p[24] = svgtiny_PATH_BEZIER;
1692 p[25] = x + rx * KAPPA;
1693 p[26] = y - ry;
1694 p[27] = x + rx;
1695 p[28] = y - ry * KAPPA;
1696 p[29] = x + rx;
1697 p[30] = y;
1698 p[31] = svgtiny_PATH_CLOSE;
1699
1700 err = svgtiny_add_path(p, 32, &state);
1701
1702 svgtiny_cleanup_state_local(&state);
1703
1704 return err;
1705 }
1706
1707
1708 /**
1709 * Parse a <line> element node.
1710 */
1711
1712 svgtiny_code svgtiny_parse_line(dom_element *line,
1713 struct svgtiny_parse_state state)
1714 {
1715 svgtiny_code err;
1716 float x1 = 0, y1 = 0, x2 = 0, y2 = 0;
1717 float *p;
1718 dom_string *attr;
1719 dom_exception exc;
1720
1721 svgtiny_setup_state_local(&state);
1722
1723 exc = dom_element_get_attribute(line, state.interned_x1, &attr);
1724 if (exc != DOM_NO_ERR) {
1725 svgtiny_cleanup_state_local(&state);
1726 return svgtiny_LIBDOM_ERROR;
1727 }
1728 if (attr != NULL) {
1729 x1 = svgtiny_parse_length(attr, state.viewport_width, state);
1730 }
1731 dom_string_unref(attr);
1732
1733 exc = dom_element_get_attribute(line, state.interned_y1, &attr);
1734 if (exc != DOM_NO_ERR) {
1735 svgtiny_cleanup_state_local(&state);
1736 return svgtiny_LIBDOM_ERROR;
1737 }
1738 if (attr != NULL) {
1739 y1 = svgtiny_parse_length(attr, state.viewport_height, state);
1740 }
1741 dom_string_unref(attr);
1742
1743 exc = dom_element_get_attribute(line, state.interned_x2, &attr);
1744 if (exc != DOM_NO_ERR) {
1745 svgtiny_cleanup_state_local(&state);
1746 return svgtiny_LIBDOM_ERROR;
1747 }
1748 if (attr != NULL) {
1749 x2 = svgtiny_parse_length(attr, state.viewport_width, state);
1750 }
1751 dom_string_unref(attr);
1752
1753 exc = dom_element_get_attribute(line, state.interned_y2, &attr);
1754 if (exc != DOM_NO_ERR) {
1755 svgtiny_cleanup_state_local(&state);
1756 return svgtiny_LIBDOM_ERROR;
1757 }
1758 if (attr != NULL) {
1759 y2 = svgtiny_parse_length(attr, state.viewport_height, state);
1760 }
1761 dom_string_unref(attr);
1762
1763 svgtiny_parse_paint_attributes(line, &state);
1764 svgtiny_parse_transform_attributes(line, &state);
1765
1766 p = malloc(7 * sizeof p[0]);
1767 if (!p) {
1768 svgtiny_cleanup_state_local(&state);
1769 return svgtiny_OUT_OF_MEMORY;
1770 }
1771
1772 p[0] = svgtiny_PATH_MOVE;
1773 p[1] = x1;
1774 p[2] = y1;
1775 p[3] = svgtiny_PATH_LINE;
1776 p[4] = x2;
1777 p[5] = y2;
1778 p[6] = svgtiny_PATH_CLOSE;
1779
1780 err = svgtiny_add_path(p, 7, &state);
1781
1782 svgtiny_cleanup_state_local(&state);
1783
1784 return err;
1785 }
1786
1787
1788 /**
1789 * Parse a <polyline> or <polygon> element node.
1790 *
1791 * http://www.w3.org/TR/SVG11/shapes#PolylineElement
1792 * http://www.w3.org/TR/SVG11/shapes#PolygonElement
1793 */
1794
1795 svgtiny_code svgtiny_parse_poly(dom_element *poly,
1796 struct svgtiny_parse_state state, bool polygon)
1797 {
1798 svgtiny_code err;
1799 dom_string *points_str;
1800 dom_exception exc;
1801 char *s, *points;
1802 float *p;
1803 unsigned int i;
1804
1805 svgtiny_setup_state_local(&state);
1806
1807 svgtiny_parse_paint_attributes(poly, &state);
1808 svgtiny_parse_transform_attributes(poly, &state);
1809
1810 exc = dom_element_get_attribute(poly, state.interned_points,
1811 &points_str);
1812 if (exc != DOM_NO_ERR) {
1813 svgtiny_cleanup_state_local(&state);
1814 return svgtiny_LIBDOM_ERROR;
1815 }
1816
1817 if (points_str == NULL) {
1818 state.diagram->error_line = -1; /* poly->line; */
1819 state.diagram->error_message =
1820 "polyline/polygon: missing points attribute";
1821 svgtiny_cleanup_state_local(&state);
1822 return svgtiny_SVG_ERROR;
1823 }
1824
1825 s = points = strndup(dom_string_data(points_str),
1826 dom_string_byte_length(points_str));
1827 dom_string_unref(points_str);
1828 /* read points attribute */
1829 if (s == NULL) {
1830 svgtiny_cleanup_state_local(&state);
1831 return svgtiny_OUT_OF_MEMORY;
1832 }
1833 /* allocate space for path: it will never have more elements than s */
1834 p = malloc(sizeof p[0] * strlen(s));
1835 if (!p) {
1836 free(points);
1837 svgtiny_cleanup_state_local(&state);
1838 return svgtiny_OUT_OF_MEMORY;
1839 }
1840
1841 /* parse s and build path */
1842 for (i = 0; s[i]; i++)
1843 if (s[i] == ',')
1844 s[i] = ' ';
1845 i = 0;
1846 while (*s) {
1847 float x, y;
1848 int n;
1849
1850 if (sscanf(s, "%f %f %n", &x, &y, &n) == 2) {
1851 if (i == 0)
1852 p[i++] = svgtiny_PATH_MOVE;
1853 else
1854 p[i++] = svgtiny_PATH_LINE;
1855 p[i++] = x;
1856 p[i++] = y;
1857 s += n;
1858 } else {
1859 break;
1860 }
1861 }
1862 if (polygon)
1863 p[i++] = svgtiny_PATH_CLOSE;
1864
1865 free(points);
1866
1867 err = svgtiny_add_path(p, i, &state);
1868
1869 svgtiny_cleanup_state_local(&state);
1870
1871 return err;
1872 }
1873
1874
1875 /**
1876 * Parse a <text> or <tspan> element node.
1877 */
1878
1879 svgtiny_code svgtiny_parse_text(dom_element *text,
1880 struct svgtiny_parse_state state)
1881 {
1882 float x, y, width, height;
1883 float px, py;
1884 dom_node *child;
1885 dom_exception exc;
1886
1887 svgtiny_setup_state_local(&state);
1888
1889 svgtiny_parse_position_attributes(text, state,
1890 &x, &y, &width, &height);
1891 svgtiny_parse_font_attributes(text, &state);
1892 svgtiny_parse_transform_attributes(text, &state);
1893
1894 px = state.ctm.a * x + state.ctm.c * y + state.ctm.e;
1895 py = state.ctm.b * x + state.ctm.d * y + state.ctm.f;
1896 /* state.ctm.e = px - state.origin_x; */
1897 /* state.ctm.f = py - state.origin_y; */
1898
1899 exc = dom_node_get_first_child(text, &child);
1900 if (exc != DOM_NO_ERR) {
1901 return svgtiny_LIBDOM_ERROR;
1902 svgtiny_cleanup_state_local(&state);
1903 }
1904 while (child != NULL) {
1905 dom_node *next;
1906 dom_node_type nodetype;
1907 svgtiny_code code = svgtiny_OK;
1908
1909 exc = dom_node_get_node_type(child, &nodetype);
1910 if (exc != DOM_NO_ERR) {
1911 dom_node_unref(child);
1912 svgtiny_cleanup_state_local(&state);
1913 return svgtiny_LIBDOM_ERROR;
1914 }
1915 if (nodetype == DOM_ELEMENT_NODE) {
1916 dom_string *nodename;
1917 exc = dom_node_get_node_name(child, &nodename);
1918 if (exc != DOM_NO_ERR) {
1919 dom_node_unref(child);
1920 svgtiny_cleanup_state_local(&state);
1921 return svgtiny_LIBDOM_ERROR;
1922 }
1923 if (dom_string_caseless_isequal(nodename,
1924 state.interned_tspan))
1925 code = svgtiny_parse_text((dom_element *)child,
1926 state);
1927 dom_string_unref(nodename);
1928 } else if (nodetype == DOM_TEXT_NODE) {
1929 struct svgtiny_shape *shape = svgtiny_add_shape(&state);
1930 dom_string *content;
1931 if (shape == NULL) {
1932 dom_node_unref(child);
1933 svgtiny_cleanup_state_local(&state);
1934 return svgtiny_OUT_OF_MEMORY;
1935 }
1936 exc = dom_text_get_whole_text(child, &content);
1937 if (exc != DOM_NO_ERR) {
1938 dom_node_unref(child);
1939 svgtiny_cleanup_state_local(&state);
1940 return svgtiny_LIBDOM_ERROR;
1941 }
1942 if (content != NULL) {
1943 shape->text = strndup(dom_string_data(content),
1944 dom_string_byte_length(content));
1945 dom_string_unref(content);
1946 } else {
1947 shape->text = strdup("");
1948 }
1949 shape->text_x = px;
1950 shape->text_y = py;
1951 state.diagram->shape_count++;
1952 }
1953
1954 if (code != svgtiny_OK) {
1955 dom_node_unref(child);
1956 svgtiny_cleanup_state_local(&state);
1957 return code;
1958 }
1959 exc = dom_node_get_next_sibling(child, &next);
1960 dom_node_unref(child);
1961 if (exc != DOM_NO_ERR) {
1962 svgtiny_cleanup_state_local(&state);
1963 return svgtiny_LIBDOM_ERROR;
1964 }
1965 child = next;
1966 }
1967
1968 svgtiny_cleanup_state_local(&state);
1969
1970 return svgtiny_OK;
1971 }
1972
1973
1974 /**
1975 * Parse x, y, width, and height attributes, if present.
1976 */
1977
1978 void svgtiny_parse_position_attributes(dom_element *node,
1979 const struct svgtiny_parse_state state,
1980 float *x, float *y, float *width, float *height)
1981 {
1982 dom_string *attr;
1983 dom_exception exc;
1984
1985 *x = 0;
1986 *y = 0;
1987 *width = state.viewport_width;
1988 *height = state.viewport_height;
1989
1990 exc = dom_element_get_attribute(node, state.interned_x, &attr);
1991 if (exc == DOM_NO_ERR && attr != NULL) {
1992 *x = svgtiny_parse_length(attr, state.viewport_width, state);
1993 dom_string_unref(attr);
1994 }
1995
1996 exc = dom_element_get_attribute(node, state.interned_y, &attr);
1997 if (exc == DOM_NO_ERR && attr != NULL) {
1998 *y = svgtiny_parse_length(attr, state.viewport_height, state);
1999 dom_string_unref(attr);
2000 }
2001
2002 exc = dom_element_get_attribute(node, state.interned_width, &attr);
2003 if (exc == DOM_NO_ERR && attr != NULL) {
2004 *width = svgtiny_parse_length(attr, state.viewport_width,
2005 state);
2006 dom_string_unref(attr);
2007 }
2008
2009 exc = dom_element_get_attribute(node, state.interned_height, &attr);
2010 if (exc == DOM_NO_ERR && attr != NULL) {
2011 *height = svgtiny_parse_length(attr, state.viewport_height,
2012 state);
2013 dom_string_unref(attr);
2014 }
2015 }
2016
2017
2018 /**
2019 * Parse a length as a number of pixels.
2020 */
2021
2022 static float _svgtiny_parse_length(const char *s, int viewport_size,
2023 const struct svgtiny_parse_state state)
2024 {
2025 int num_length = strspn(s, "0123456789+-.");
2026 const char *unit = s + num_length;
2027 float n = atof((const char *) s);
2028 float font_size = 20;
2029
2030 UNUSED(state);
2031
2032 if (unit[0] == 0) {
2033 return n;
2034 } else if (unit[0] == '%') {
2035 return n / 100.0 * viewport_size;
2036 } else if (unit[0] == 'e' && unit[1] == 'm') {
2037 return n * font_size;
2038 } else if (unit[0] == 'e' && unit[1] == 'x') {
2039 return n / 2.0 * font_size;
2040 } else if (unit[0] == 'p' && unit[1] == 'x') {
2041 return n;
2042 } else if (unit[0] == 'p' && unit[1] == 't') {
2043 return n * 1.25;
2044 } else if (unit[0] == 'p' && unit[1] == 'c') {
2045 return n * 15.0;
2046 } else if (unit[0] == 'm' && unit[1] == 'm') {
2047 return n * 3.543307;
2048 } else if (unit[0] == 'c' && unit[1] == 'm') {
2049 return n * 35.43307;
2050 } else if (unit[0] == 'i' && unit[1] == 'n') {
2051 return n * 90;
2052 }
2053
2054 return 0;
2055 }
2056
2057 float svgtiny_parse_length(dom_string *s, int viewport_size,
2058 const struct svgtiny_parse_state state)
2059 {
2060 char *ss = strndup(dom_string_data(s), dom_string_byte_length(s));
2061 float ret = _svgtiny_parse_length(ss, viewport_size, state);
2062 free(ss);
2063 return ret;
2064 }
2065
2066 /**
2067 * Parse paint attributes, if present.
2068 */
2069
2070 void svgtiny_parse_paint_attributes(dom_element *node,
2071 struct svgtiny_parse_state *state)
2072 {
2073 dom_string *attr;
2074 dom_exception exc;
2075
2076 /* We store the result of svgtiny_parse_style_inline() in
2077 * inline_sheet, and that function returns NULL on error; in
2078 * particular you do not need to css_stylesheet_destroy() the
2079 * result if it is NULL. We initialize inline_sheet to NULL to
2080 * retain the same semantics. */
2081 css_stylesheet *inline_sheet = NULL;
2082
2083 exc = dom_element_get_attribute(node, state->interned_fill, &attr);
2084 if (exc == DOM_NO_ERR && attr != NULL) {
2085 svgtiny_parse_color(attr, &state->fill, &state->fill_grad, state);
2086 dom_string_unref(attr);
2087 }
2088
2089 exc = dom_element_get_attribute(node, state->interned_stroke, &attr);
2090 if (exc == DOM_NO_ERR && attr != NULL) {
2091 svgtiny_parse_color(attr, &state->stroke, &state->stroke_grad, state);
2092 dom_string_unref(attr);
2093 }
2094
2095 exc = dom_element_get_attribute(node, state->interned_stroke_width, &attr);
2096 if (exc == DOM_NO_ERR && attr != NULL) {
2097 state->stroke_width = svgtiny_parse_length(attr,
2098 state->viewport_width, *state);
2099 dom_string_unref(attr);
2100 }
2101
2102 exc = dom_element_get_attribute(node, state->interned_style, &attr);
2103 if (exc == DOM_NO_ERR && attr != NULL) {
2104 /* First parse the style attribute into a libcss stylesheet
2105 in case any of its properties are known to libcss. */
2106 inline_sheet = svgtiny_parse_style_inline(
2107 (uint8_t *)dom_string_data(attr),
2108 dom_string_byte_length(attr));
2109
2110 /* Parse any other properties "by hand" until they can
2111 be supported in libcss. */
2112 char *style = strndup(dom_string_data(attr),
2113 dom_string_byte_length(attr));
2114 const char *s;
2115 char *value;
2116 if ((s = strstr(style, "fill:"))) {
2117 s += 5;
2118 while (*s == ' ')
2119 s++;
2120 value = strndup(s, strcspn(s, "; "));
2121 _svgtiny_parse_color(value, &state->fill, &state->fill_grad, state);
2122 free(value);
2123 }
2124 if ((s = strstr(style, "stroke:"))) {
2125 s += 7;
2126 while (*s == ' ')
2127 s++;
2128 value = strndup(s, strcspn(s, "; "));
2129 _svgtiny_parse_color(value, &state->stroke, &state->stroke_grad, state);
2130 free(value);
2131 }
2132 if ((s = strstr(style, "stroke-width:"))) {
2133 s += 13;
2134 while (*s == ' ')
2135 s++;
2136 value = strndup(s, strcspn(s, "; "));
2137 state->stroke_width = _svgtiny_parse_length(value,
2138 state->viewport_width, *state);
2139 free(value);
2140 }
2141 free(style);
2142 dom_string_unref(attr);
2143 }
2144
2145 if (inline_sheet != NULL) {
2146 css_stylesheet_destroy(inline_sheet);
2147 }
2148 }
2149
2150
2151 /**
2152 * Parse a colour.
2153 */
2154
2155 static void _svgtiny_parse_color(const char *s, svgtiny_colour *c,
2156 struct svgtiny_parse_state_gradient *grad,
2157 struct svgtiny_parse_state *state)
2158 {
2159 unsigned int r, g, b;
2160 float rf, gf, bf;
2161 size_t len = strlen(s);
2162 char *id = 0, *rparen;
2163
2164 if (len == 4 && s[0] == '#') {
2165 if (sscanf(s + 1, "%1x%1x%1x", &r, &g, &b) == 3)
2166 *c = svgtiny_RGB(r | r << 4, g | g << 4, b | b << 4);
2167
2168 } else if (len == 7 && s[0] == '#') {
2169 if (sscanf(s + 1, "%2x%2x%2x", &r, &g, &b) == 3)
2170 *c = svgtiny_RGB(r, g, b);
2171
2172 } else if (10 <= len && s[0] == 'r' && s[1] == 'g' && s[2] == 'b' &&
2173 s[3] == '(' && s[len - 1] == ')') {
2174 if (sscanf(s + 4, "%u,%u,%u", &r, &g, &b) == 3)
2175 *c = svgtiny_RGB(r, g, b);
2176 else if (sscanf(s + 4, "%f%%,%f%%,%f%%", &rf, &gf, &bf) == 3) {
2177 b = bf * 255 / 100;
2178 g = gf * 255 / 100;
2179 r = rf * 255 / 100;
2180 *c = svgtiny_RGB(r, g, b);
2181 }
2182
2183 } else if (len == 4 && strcmp(s, "none") == 0) {
2184 *c = svgtiny_TRANSPARENT;
2185
2186 } else if (5 < len && s[0] == 'u' && s[1] == 'r' && s[2] == 'l' &&
2187 s[3] == '(') {
2188 if (grad == NULL) {
2189 *c = svgtiny_RGB(0, 0, 0);
2190 } else if (s[4] == '#') {
2191 id = strdup(s + 5);
2192 if (!id)
2193 return;
2194 rparen = strchr(id, ')');
2195 if (rparen)
2196 *rparen = 0;
2197 svgtiny_find_gradient(id, grad, state);
2198 free(id);
2199 if (grad->linear_gradient_stop_count == 0)
2200 *c = svgtiny_TRANSPARENT;
2201 else if (grad->linear_gradient_stop_count == 1)
2202 *c = grad->gradient_stop[0].color;
2203 else
2204 *c = svgtiny_LINEAR_GRADIENT;
2205 }
2206
2207 } else {
2208 const struct svgtiny_named_color *named_color;
2209 named_color = svgtiny_color_lookup(s, strlen(s));
2210 if (named_color)
2211 *c = named_color->color;
2212 }
2213 }
2214
2215 void svgtiny_parse_color(dom_string *s, svgtiny_colour *c,
2216 struct svgtiny_parse_state_gradient *grad,
2217 struct svgtiny_parse_state *state)
2218 {
2219 dom_string_ref(s);
2220 _svgtiny_parse_color(dom_string_data(s), c, grad, state);
2221 dom_string_unref(s);
2222 }
2223
2224 /**
2225 * Parse font attributes, if present.
2226 */
2227
2228 void svgtiny_parse_font_attributes(dom_element *node,
2229 struct svgtiny_parse_state *state)
2230 {
2231 /* TODO: Implement this, it never used to be */
2232 UNUSED(node);
2233 UNUSED(state);
2234 #ifdef WRITTEN_THIS_PROPERLY
2235 const xmlAttr *attr;
2236
2237 UNUSED(state);
2238
2239 for (attr = node->properties; attr; attr = attr->next) {
2240 if (strcmp((const char *) attr->name, "font-size") == 0) {
2241 /* TODO */
2242 }
2243 }
2244 #endif
2245 }
2246
2247
2248 /**
2249 * Parse transform attributes, if present.
2250 *
2251 * http://www.w3.org/TR/SVG11/coords#TransformAttribute
2252 */
2253
2254 void svgtiny_parse_transform_attributes(dom_element *node,
2255 struct svgtiny_parse_state *state)
2256 {
2257 char *transform;
2258 dom_string *attr;
2259 dom_exception exc;
2260
2261 exc = dom_element_get_attribute(node, state->interned_transform,
2262 &attr);
2263 if (exc == DOM_NO_ERR && attr != NULL) {
2264 transform = strndup(dom_string_data(attr),
2265 dom_string_byte_length(attr));
2266 svgtiny_parse_transform(transform, &state->ctm.a, &state->ctm.b,
2267 &state->ctm.c, &state->ctm.d,
2268 &state->ctm.e, &state->ctm.f);
2269 free(transform);
2270 dom_string_unref(attr);
2271 }
2272 }
2273
2274
2275 /**
2276 * Parse a transform string.
2277 */
2278
2279 void svgtiny_parse_transform(char *s, float *ma, float *mb,
2280 float *mc, float *md, float *me, float *mf)
2281 {
2282 float a, b, c, d, e, f;
2283 float za, zb, zc, zd, ze, zf;
2284 float angle, x, y;
2285 int n;
2286 unsigned int i;
2287
2288 for (i = 0; s[i]; i++)
2289 if (s[i] == ',')
2290 s[i] = ' ';
2291
2292 while (*s) {
2293 a = d = 1;
2294 b = c = 0;
2295 e = f = 0;
2296 n = 0;
2297 if ((sscanf(s, " matrix (%f %f %f %f %f %f ) %n",
2298 &a, &b, &c, &d, &e, &f, &n) == 6) && (n > 0))
2299 ;
2300 else if ((sscanf(s, " translate (%f %f ) %n",
2301 &e, &f, &n) == 2) && (n > 0))
2302 ;
2303 else if ((sscanf(s, " translate (%f ) %n",
2304 &e, &n) == 1) && (n > 0))
2305 ;
2306 else if ((sscanf(s, " scale (%f %f ) %n",
2307 &a, &d, &n) == 2) && (n > 0))
2308 ;
2309 else if ((sscanf(s, " scale (%f ) %n",
2310 &a, &n) == 1) && (n > 0))
2311 d = a;
2312 else if ((sscanf(s, " rotate (%f %f %f ) %n",
2313 &angle, &x, &y, &n) == 3) && (n > 0)) {
2314 angle = angle / 180 * M_PI;
2315 a = cos(angle);
2316 b = sin(angle);
2317 c = -sin(angle);
2318 d = cos(angle);
2319 e = -x * cos(angle) + y * sin(angle) + x;
2320 f = -x * sin(angle) - y * cos(angle) + y;
2321 } else if ((sscanf(s, " rotate (%f ) %n",
2322 &angle, &n) == 1) && (n > 0)) {
2323 angle = angle / 180 * M_PI;
2324 a = cos(angle);
2325 b = sin(angle);
2326 c = -sin(angle);
2327 d = cos(angle);
2328 } else if ((sscanf(s, " skewX (%f ) %n",
2329 &angle, &n) == 1) && (n > 0)) {
2330 angle = angle / 180 * M_PI;
2331 c = tan(angle);
2332 } else if ((sscanf(s, " skewY (%f ) %n",
2333 &angle, &n) == 1) && (n > 0)) {
2334 angle = angle / 180 * M_PI;
2335 b = tan(angle);
2336 } else
2337 break;
2338 za = *ma * a + *mc * b;
2339 zb = *mb * a + *md * b;
2340 zc = *ma * c + *mc * d;
2341 zd = *mb * c + *md * d;
2342 ze = *ma * e + *mc * f + *me;
2343 zf = *mb * e + *md * f + *mf;
2344 *ma = za;
2345 *mb = zb;
2346 *mc = zc;
2347 *md = zd;
2348 *me = ze;
2349 *mf = zf;
2350 s += n;
2351 }
2352 }
2353
2354
2355 /**
2356 * Add a path to the svgtiny_diagram.
2357 */
2358
2359 svgtiny_code svgtiny_add_path(float *p, unsigned int n,
2360 struct svgtiny_parse_state *state)
2361 {
2362 struct svgtiny_shape *shape;
2363
2364 if (state->fill == svgtiny_LINEAR_GRADIENT)
2365 return svgtiny_add_path_linear_gradient(p, n, state);
2366
2367 svgtiny_transform_path(p, n, state);
2368
2369 shape = svgtiny_add_shape(state);
2370 if (!shape) {
2371 free(p);
2372 return svgtiny_OUT_OF_MEMORY;
2373 }
2374 shape->path = p;
2375 shape->path_length = n;
2376 state->diagram->shape_count++;
2377
2378 return svgtiny_OK;
2379 }
2380
2381
2382 /**
2383 * Add a svgtiny_shape to the svgtiny_diagram.
2384 */
2385
2386 struct svgtiny_shape *svgtiny_add_shape(struct svgtiny_parse_state *state)
2387 {
2388 struct svgtiny_shape *shape = realloc(state->diagram->shape,
2389 (state->diagram->shape_count + 1) *
2390 sizeof (state->diagram->shape[0]));
2391 if (!shape)
2392 return 0;
2393 state->diagram->shape = shape;
2394
2395 shape += state->diagram->shape_count;
2396 shape->path = 0;
2397 shape->path_length = 0;
2398 shape->text = 0;
2399 shape->fill = state->fill;
2400 shape->stroke = state->stroke;
2401 shape->stroke_width = lroundf((float) state->stroke_width *
2402 (state->ctm.a + state->ctm.d) / 2.0);
2403 if (0 < state->stroke_width && shape->stroke_width == 0)
2404 shape->stroke_width = 1;
2405
2406 return shape;
2407 }
2408
2409
2410 /**
2411 * Apply the current transformation matrix to a path.
2412 */
2413
2414 void svgtiny_transform_path(float *p, unsigned int n,
2415 struct svgtiny_parse_state *state)
2416 {
2417 unsigned int j;
2418
2419 for (j = 0; j != n; ) {
2420 unsigned int points = 0;
2421 unsigned int k;
2422 switch ((int) p[j]) {
2423 case svgtiny_PATH_MOVE:
2424 case svgtiny_PATH_LINE:
2425 points = 1;
2426 break;
2427 case svgtiny_PATH_CLOSE:
2428 points = 0;
2429 break;
2430 case svgtiny_PATH_BEZIER:
2431 points = 3;
2432 break;
2433 default:
2434 assert(0);
2435 }
2436 j++;
2437 for (k = 0; k != points; k++) {
2438 float x0 = p[j], y0 = p[j + 1];
2439 float x = state->ctm.a * x0 + state->ctm.c * y0 +
2440 state->ctm.e;
2441 float y = state->ctm.b * x0 + state->ctm.d * y0 +
2442 state->ctm.f;
2443 p[j] = x;
2444 p[j + 1] = y;
2445 j += 2;
2446 }
2447 }
2448 }
2449
2450
2451 /**
2452 * Free all memory used by a diagram.
2453 */
2454
2455 void svgtiny_free(struct svgtiny_diagram *svg)
2456 {
2457 unsigned int i;
2458 assert(svg);
2459
2460 for (i = 0; i != svg->shape_count; i++) {
2461 free(svg->shape[i].path);
2462 free(svg->shape[i].text);
2463 }
2464
2465 free(svg->shape);
2466
2467 free(svg);
2468 }
2469
2470 #ifndef HAVE_STRNDUP
2471 char *svgtiny_strndup(const char *s, size_t n)
2472 {
2473 size_t len;
2474 char *s2;
2475
2476 for (len = 0; len != n && s[len]; len++)
2477 continue;
2478
2479 s2 = malloc(len + 1);
2480 if (s2 == NULL)
2481 return NULL;
2482
2483 memcpy(s2, s, len);
2484 s2[len] = '\0';
2485
2486 return s2;
2487 }
2488 #endif
Development fork of https://git.netsurf-browser.org/libsvgtiny.git