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>
18 #include <dom/bindings/xml/xmlparser.h>
20 #include <libcss/libcss.h>
23 #include "svgtiny_internal.h"
25 /* Source file generated by `gperf`. */
26 #include "autogenerated_colors.c"
28 #define TAU 6.28318530717958647692
31 #define M_PI 3.14159265358979323846
35 #define M_PI_2 1.57079632679489661923
38 #define KAPPA 0.5522847498
40 #define degToRad(angleInDegrees) ((angleInDegrees) * M_PI / 180.0)
41 #define radToDeg(angleInRadians) ((angleInRadians) * 180.0 / M_PI)
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
,
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
);
81 * rotate midpoint vector
84 rotate_midpoint_vector(float ax
, float ay
,
87 double *x_out
, double *y_out
)
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 */
94 /* compute the sin and cos of the angle */
95 cosangle
= cos(radangle
);
96 sinangle
= sin(radangle
);
98 /* compute the midpoint between start and end points */
99 dx2
= (ax
- bx
) / 2.0;
100 dy2
= (ay
- by
) / 2.0;
102 /* rotate vector to remove angle */
103 *x_out
= ((cosangle
* dx2
) + (sinangle
* dy2
));
104 *y_out
= ((-sinangle
* dx2
) + (cosangle
* dy2
));
109 * ensure the arc radii are large enough and scale as appropriate
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.
116 ensure_radii_scale(double x1_sq
, double y1_sq
,
117 float *rx
, float *ry
,
118 double *rx_sq
, double *ry_sq
)
123 /* set radii square values */
124 (*rx_sq
) = (*rx
) * (*rx
);
125 (*ry_sq
) = (*ry
) * (*ry
);
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
);
141 * compute the transformed centre point
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
)
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
;
156 coef
= (sign
* sqrt(sq
));
158 *cx1
= coef
* ((rx
* y1
) / ry
);
159 *cy1
= coef
* -((ry
* x1
) / rx
);
164 * compute untransformed centre point
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
172 compute_centre_point(float ax
, float ay
,
174 double cx1
, double cy1
,
176 double *x_out
, double *y_out
)
180 double cosangle
; /* cosine of rotation angle */
181 double sinangle
; /* sine of rotation angle */
183 /* compute the sin and cos of the angle */
184 cosangle
= cos(radangle
);
185 sinangle
= sin(radangle
);
187 sx2
= (ax
+ bx
) / 2.0;
188 sy2
= (ay
+ by
) / 2.0;
190 *x_out
= sx2
+ (cosangle
* cx1
- sinangle
* cy1
);
191 *y_out
= sy2
+ (sinangle
* cx1
+ cosangle
* cy1
);
196 * compute the angle start and extent
199 compute_angle_start_extent(float rx
, float ry
,
200 double x1
, double y1
,
201 double cx1
, double cy1
,
202 double *start
, double *extent
)
213 * Angle betwen two vectors is +/- acos( u.v / len(u) * len(v))
215 * '.' is the dot product.
216 * +/- is calculated from the sign of the cross product (u x v)
219 ux
= (x1
- cx1
) / rx
;
220 uy
= (y1
- cy1
) / ry
;
221 vx
= (-x1
- cx1
) / rx
;
222 vy
= (-y1
- cy1
) / ry
;
224 /* compute the start angle */
225 /* The angle between (ux, uy) and the 0 angle */
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 */
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
);
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
;
241 /* arc cos must operate between -1 and 1 */
244 *extent
= sign
* M_PI
;
245 } else if (actmp
> 1.0) {
248 *extent
= sign
* acos(actmp
);
254 * converts a circle centered unit circle arc to a series of bezier curves
256 * Each bezier is stored as six values of three pairs of coordinates
258 * The beziers are stored without their start point as that is assumed
259 * to be the preceding elements end point.
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)
267 circle_arc_to_bezier(double start
, double extent
, double *bzpt
)
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));
281 for (segment
= 0; segment
< bzsegments
; segment
++) {
282 /* first control point */
283 angle
= start
+ (segment
* increment
);
286 bzpt
[pos
++] = dx
- controllen
* dy
;
287 bzpt
[pos
++] = dy
+ controllen
* dx
;
288 /* second control point */
292 bzpt
[pos
++] = dx
+ controllen
* dy
;
293 bzpt
[pos
++] = dy
- controllen
* dx
;
304 * transform coordinate list
306 * perform a scale, rotate and translate on list of coordinates
312 * homogeneous transforms
320 * | cos(an) -sin(an) 0 |
321 * R = | sin(an) cos(an) 0 |
324 * {{cos(a), -sin(a) 0}, {sin(a), cos(a),0}, {0,0,1}}
331 * note order is significat here and the combined matrix is
334 * | cos(an) -sin(an) cx |
335 * T.R = | sin(an) cos(an) cy |
338 * | rx * cos(an) ry * -sin(an) cx |
339 * T.R.S = | rx * sin(an) ry * cos(an) cy |
342 * {{Cos[a], -Sin[a], c}, {Sin[a], Cos[a], d}, {0, 0, 1}} . {{r, 0, 0}, {0, s, 0}, {0, 0, 1}}
354 * x2 = cx + (rx * x1 * cos(a)) + (ry * y1 * -1 * sin(a))
355 * y2 = cy + (ry * y1 * cos(a)) + (rx * x1 * sin(a))
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
367 scale_rotate_translate_points(double rx
, double ry
,
369 double cx
, double cy
,
374 double cosangle
; /* cosine of rotation angle */
375 double sinangle
; /* sine of rotation angle */
376 double rxcosangle
, rxsinangle
, rycosangle
, rynsinangle
;
379 /* compute the sin and cos of the angle */
380 cosangle
= cos(radangle
);
381 sinangle
= sin(radangle
);
383 rxcosangle
= rx
* cosangle
;
384 rxsinangle
= rx
* sinangle
;
385 rycosangle
= ry
* cosangle
;
386 rynsinangle
= ry
* -1 * sinangle
;
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
);
392 points
[pnt
+ 1] = y2
;
398 * convert an svg path arc to a bezier curve
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.
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.
410 * \param bzpoints the array to fill with bezier curves
411 * \return the number of bezier segments generated or -1 for a line
414 svgarc_to_bezier(float start_x
,
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
;
435 if ((start_x
== end_x
) && (start_y
== end_y
)) {
437 * if the start and end coordinates are the same the
438 * svg spec says this is equivalent to having no segment
444 if ((rx
== 0) || (ry
== 0)) {
446 * if either radii is zero the specified behaviour is a line
451 /* obtain the absolute values of the radii */
455 /* convert normalised angle to radians */
456 radangle
= degToRad(fmod(angle
, 360.0));
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
);
463 /* get squared x1 values */
467 /* ensure radii are correctly scaled */
468 ensure_radii_scale(x1_sq
, y1_sq
, &rx
, &ry
, &rx_sq
, &ry_sq
);
470 /* compute the transformed centre point */
471 compute_transformed_centre_point(largearc
== sweep
?-1:1,
479 /* get the untransformed centre point */
480 compute_centre_point(start_x
, start_y
,
487 /* compute anglestart and extent */
488 compute_angle_start_extent(rx
,ry
,
493 /* extent of 0 is a straight line */
498 /* take account of sweep */
499 if (!sweep
&& extent
> 0) {
501 } else if (sweep
&& extent
< 0) {
505 /* normalise start and extent */
506 extent
= fmod(extent
, TAU
);
507 start
= fmod(start
, TAU
);
509 /* convert the arc to unit circle bezier curves */
510 bzsegments
= circle_arc_to_bezier(start
, extent
, bzpoints
);
512 /* transform the bezier curves */
513 scale_rotate_translate_points(rx
, ry
,
524 * Call this to ref the strings in a gradient state.
526 static void svgtiny_grad_string_ref(struct svgtiny_parse_state_gradient
*grad
)
528 if (grad
->gradient_x1
!= NULL
) {
529 dom_string_ref(grad
->gradient_x1
);
531 if (grad
->gradient_y1
!= NULL
) {
532 dom_string_ref(grad
->gradient_y1
);
534 if (grad
->gradient_x2
!= NULL
) {
535 dom_string_ref(grad
->gradient_x2
);
537 if (grad
->gradient_y2
!= NULL
) {
538 dom_string_ref(grad
->gradient_y2
);
543 * Call this to clean up the strings in a gradient state.
545 static void svgtiny_grad_string_cleanup(
546 struct svgtiny_parse_state_gradient
*grad
)
548 if (grad
->gradient_x1
!= NULL
) {
549 dom_string_unref(grad
->gradient_x1
);
550 grad
->gradient_x1
= NULL
;
552 if (grad
->gradient_y1
!= NULL
) {
553 dom_string_unref(grad
->gradient_y1
);
554 grad
->gradient_y1
= NULL
;
556 if (grad
->gradient_x2
!= NULL
) {
557 dom_string_unref(grad
->gradient_x2
);
558 grad
->gradient_x2
= NULL
;
560 if (grad
->gradient_y2
!= NULL
) {
561 dom_string_unref(grad
->gradient_y2
);
562 grad
->gradient_y2
= NULL
;
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.
571 static void svgtiny_setup_state_local(struct svgtiny_parse_state
*state
)
573 svgtiny_grad_string_ref(&(state
->fill_grad
));
574 svgtiny_grad_string_ref(&(state
->stroke_grad
));
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.
582 static void svgtiny_cleanup_state_local(struct svgtiny_parse_state
*state
)
584 svgtiny_grad_string_cleanup(&(state
->fill_grad
));
585 svgtiny_grad_string_cleanup(&(state
->stroke_grad
));
590 * Create a new svgtiny_diagram structure.
593 struct svgtiny_diagram
*svgtiny_create(void)
595 struct svgtiny_diagram
*diagram
;
597 diagram
= calloc(sizeof(*diagram
), 1);
606 static void ignore_msg(uint32_t severity
, void *ctx
, const char *msg
, ...)
614 * Parse a block of memory into a svgtiny_diagram.
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
)
622 dom_document
*document
;
624 dom_xml_parser
*parser
;
627 dom_string
*svg_name
;
628 lwc_string
*svg_name_lwc
;
629 struct svgtiny_parse_state state
;
630 float x
, y
, width
, height
;
639 parser
= dom_xml_parser_create(NULL
, NULL
,
640 ignore_msg
, NULL
, &document
);
643 return svgtiny_LIBDOM_ERROR
;
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
;
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
;
659 /* We're done parsing, drop the parser.
660 * We now own the document entirely.
662 dom_xml_parser_destroy(parser
);
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
;
671 /* no root svg element */
672 dom_node_unref(document
);
673 return svgtiny_SVG_ERROR
;
676 exc
= dom_node_get_node_name(svg
, &svg_name
);
677 if (exc
!= DOM_NO_ERR
) {
679 dom_node_unref(document
);
680 return svgtiny_LIBDOM_ERROR
;
682 if (lwc_intern_string("svg", 3 /* SLEN("svg") */,
683 &svg_name_lwc
) != lwc_error_ok
) {
684 dom_string_unref(svg_name
);
686 dom_node_unref(document
);
687 return svgtiny_LIBDOM_ERROR
;
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
);
693 dom_node_unref(document
);
694 return svgtiny_NOT_SVG
;
697 lwc_string_unref(svg_name_lwc
);
698 dom_string_unref(svg_name
);
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
;
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
) {
713 dom_node_unref(document
);
714 return svgtiny_LIBCSS_ERROR
;
718 #define SVGTINY_STRING_ACTION2(s,n) \
719 if (dom_string_create_interned((const uint8_t *) #n, \
720 strlen(#n), &state.interned_##s) \
722 code = svgtiny_LIBDOM_ERROR; \
725 #include "svgtiny_strings.h"
726 #undef SVGTINY_STRING_ACTION2
728 svgtiny_parse_position_attributes(svg
, state
, &x
, &y
, &width
, &height
);
729 diagram
->width
= width
;
730 diagram
->height
= height
;
732 /* set up parsing state */
733 state
.viewport_width
= width
;
734 state
.viewport_height
= height
;
735 state
.ctm
.a
= 1; /*(float) viewport_width / (float) width;*/
738 state
.ctm
.d
= 1; /*(float) viewport_height / (float) height;*/
739 state
.ctm
.e
= 0; /*x;*/
740 state
.ctm
.f
= 0; /*y;*/
741 state
.fill
= 0x000000;
742 state
.stroke
= svgtiny_TRANSPARENT
;
743 state
.stroke_width
= 1;
746 code
= svgtiny_preparse_styles(svg
, state
);
747 if (code
== svgtiny_OK
) {
748 code
= svgtiny_parse_svg(svg
, state
);
752 dom_node_unref(document
);
753 css_code
= css_select_ctx_destroy(state
.select_ctx
);
754 if (css_code
!= CSS_OK
) {
755 code
= svgtiny_LIBCSS_ERROR
;
759 svgtiny_cleanup_state_local(&state
);
760 #define SVGTINY_STRING_ACTION2(s,n) \
761 if (state.interned_##s != NULL) \
762 dom_string_unref(state.interned_##s);
763 #include "svgtiny_strings.h"
764 #undef SVGTINY_STRING_ACTION2
770 * Parse a single <style> element, appending the result to the CSS
771 * select context within the given parser state.
773 svgtiny_code
svgtiny_parse_style_element(dom_element
*style
,
774 struct svgtiny_parse_state state
)
776 css_stylesheet
*sheet
;
780 code
= svgtiny_create_stylesheet(&sheet
, false);
781 if (code
!= CSS_OK
) {
782 return svgtiny_LIBCSS_ERROR
;
785 /* Parse the style element's "media" attribute if it has
786 one. We don't do anything with it right now. */
787 dom_string
*media_attr
;
788 exc
= dom_element_get_attribute(style
, state
.interned_media
,
790 if (exc
!= DOM_NO_ERR
) {
791 css_stylesheet_destroy(sheet
);
792 return svgtiny_LIBDOM_ERROR
;
796 /* Here's where we'd actually change the media type if
797 we were going to use it */
798 dom_string_unref(media_attr
);
802 dom_node_get_text_content(style
, &data
);
804 /* Empty stylesheet? That's fine. */
805 css_stylesheet_destroy(sheet
);
809 code
= css_stylesheet_append_data(sheet
,
810 (uint8_t *)dom_string_data(data
),
811 dom_string_byte_length(data
));
812 if (code
!= CSS_OK
&& code
!= CSS_NEEDDATA
) {
813 dom_string_unref(data
);
814 css_stylesheet_destroy(sheet
);
815 return svgtiny_LIBCSS_ERROR
;
818 code
= css_stylesheet_data_done(sheet
);
819 if (code
!= CSS_OK
) {
820 dom_string_unref(data
);
821 css_stylesheet_destroy(sheet
);
822 return svgtiny_LIBCSS_ERROR
;
825 code
= css_select_ctx_append_sheet(state
.select_ctx
,
829 if (code
!= CSS_OK
) {
830 dom_string_unref(data
);
831 return svgtiny_LIBCSS_ERROR
;
834 dom_string_unref(data
);
840 * Parse the contents of an inline style and return (a pointer to) the
841 * corresponding stylesheet for use with css_select_style(). Returns
842 * NULL if anything goes wrong.
844 css_stylesheet
*svgtiny_parse_style_inline(const uint8_t *data
,
847 css_stylesheet
*sheet
;
850 code
= svgtiny_create_stylesheet(&sheet
, true);
851 if (code
!= CSS_OK
) {
855 code
= css_stylesheet_append_data(sheet
, data
, len
);
856 if (code
!= CSS_OK
&& code
!= CSS_NEEDDATA
) {
857 css_stylesheet_destroy(sheet
);
861 code
= css_stylesheet_data_done(sheet
);
862 if (code
!= CSS_OK
) {
863 css_stylesheet_destroy(sheet
);
871 * Parse all <style> elements within a root <svg> element. This
872 * should be called before svgtiny_parse_svg() because that function
873 * makes a single pass through the document and we'd like all style
874 * information to be available during that pass. Specifically, we'd
875 * like a <style> sheet at the end of the document to affect the
876 * rendering of elements at its beginning.
878 * The element-parsing inner loop here is essentially the same as
879 * that within svgtiny_parse_svg().
881 svgtiny_code
svgtiny_preparse_styles(dom_element
*svg
,
882 struct svgtiny_parse_state state
)
887 exc
= dom_node_get_first_child(svg
, (dom_node
**) (void *) &child
);
888 if (exc
!= DOM_NO_ERR
) {
889 return svgtiny_LIBDOM_ERROR
;
891 while (child
!= NULL
) {
893 dom_node_type nodetype
;
894 svgtiny_code code
= svgtiny_OK
;
896 exc
= dom_node_get_node_type(child
, &nodetype
);
897 if (exc
!= DOM_NO_ERR
) {
898 dom_node_unref(child
);
899 return svgtiny_LIBDOM_ERROR
;
901 if (nodetype
== DOM_ELEMENT_NODE
) {
902 dom_string
*nodename
;
903 exc
= dom_node_get_node_name(child
, &nodename
);
904 if (exc
!= DOM_NO_ERR
) {
905 dom_node_unref(child
);
906 return svgtiny_LIBDOM_ERROR
;
909 if (dom_string_caseless_isequal(state
.interned_style
,
911 /* We have a <style> element, parse it */
912 code
= svgtiny_parse_style_element(child
,
917 dom_string_unref(nodename
);
919 if (code
!= svgtiny_OK
) {
920 dom_node_unref(child
);
923 exc
= dom_node_get_next_sibling(child
,
924 (dom_node
**) (void *) &next
);
925 dom_node_unref(child
);
926 if (exc
!= DOM_NO_ERR
) {
927 return svgtiny_LIBDOM_ERROR
;
936 * Parse a <svg> or <g> element node.
939 svgtiny_code
svgtiny_parse_svg(dom_element
*svg
,
940 struct svgtiny_parse_state state
)
942 float x
, y
, width
, height
;
943 dom_string
*view_box
;
947 svgtiny_setup_state_local(&state
);
949 svgtiny_parse_position_attributes(svg
, state
, &x
, &y
, &width
, &height
);
950 svgtiny_parse_paint_attributes(svg
, &state
);
951 svgtiny_parse_font_attributes(svg
, &state
);
953 exc
= dom_element_get_attribute(svg
, state
.interned_viewBox
,
955 if (exc
!= DOM_NO_ERR
) {
956 svgtiny_cleanup_state_local(&state
);
957 return svgtiny_LIBDOM_ERROR
;
961 char *s
= strndup(dom_string_data(view_box
),
962 dom_string_byte_length(view_box
));
963 float min_x
, min_y
, vwidth
, vheight
;
964 if (sscanf(s
, "%f,%f,%f,%f",
965 &min_x
, &min_y
, &vwidth
, &vheight
) == 4 ||
966 sscanf(s
, "%f %f %f %f",
967 &min_x
, &min_y
, &vwidth
, &vheight
) == 4) {
968 state
.ctm
.a
= (float) state
.viewport_width
/ vwidth
;
969 state
.ctm
.d
= (float) state
.viewport_height
/ vheight
;
970 state
.ctm
.e
+= -min_x
* state
.ctm
.a
;
971 state
.ctm
.f
+= -min_y
* state
.ctm
.d
;
974 dom_string_unref(view_box
);
977 svgtiny_parse_transform_attributes(svg
, &state
);
979 exc
= dom_node_get_first_child(svg
, (dom_node
**) (void *) &child
);
980 if (exc
!= DOM_NO_ERR
) {
981 svgtiny_cleanup_state_local(&state
);
982 return svgtiny_LIBDOM_ERROR
;
984 while (child
!= NULL
) {
986 dom_node_type nodetype
;
987 svgtiny_code code
= svgtiny_OK
;
989 exc
= dom_node_get_node_type(child
, &nodetype
);
990 if (exc
!= DOM_NO_ERR
) {
991 dom_node_unref(child
);
992 return svgtiny_LIBDOM_ERROR
;
994 if (nodetype
== DOM_ELEMENT_NODE
) {
995 dom_string
*nodename
;
996 exc
= dom_node_get_node_name(child
, &nodename
);
997 if (exc
!= DOM_NO_ERR
) {
998 dom_node_unref(child
);
999 svgtiny_cleanup_state_local(&state
);
1000 return svgtiny_LIBDOM_ERROR
;
1002 if (dom_string_caseless_isequal(state
.interned_svg
,
1004 code
= svgtiny_parse_svg(child
, state
);
1005 else if (dom_string_caseless_isequal(state
.interned_g
,
1007 code
= svgtiny_parse_svg(child
, state
);
1008 else if (dom_string_caseless_isequal(state
.interned_a
,
1010 code
= svgtiny_parse_svg(child
, state
);
1011 else if (dom_string_caseless_isequal(state
.interned_path
,
1013 code
= svgtiny_parse_path(child
, state
);
1014 else if (dom_string_caseless_isequal(state
.interned_rect
,
1016 code
= svgtiny_parse_rect(child
, state
);
1017 else if (dom_string_caseless_isequal(state
.interned_circle
,
1019 code
= svgtiny_parse_circle(child
, state
);
1020 else if (dom_string_caseless_isequal(state
.interned_ellipse
,
1022 code
= svgtiny_parse_ellipse(child
, state
);
1023 else if (dom_string_caseless_isequal(state
.interned_line
,
1025 code
= svgtiny_parse_line(child
, state
);
1026 else if (dom_string_caseless_isequal(state
.interned_polyline
,
1028 code
= svgtiny_parse_poly(child
, state
, false);
1029 else if (dom_string_caseless_isequal(state
.interned_polygon
,
1031 code
= svgtiny_parse_poly(child
, state
, true);
1032 else if (dom_string_caseless_isequal(state
.interned_text
,
1034 code
= svgtiny_parse_text(child
, state
);
1035 dom_string_unref(nodename
);
1037 if (code
!= svgtiny_OK
) {
1038 dom_node_unref(child
);
1039 svgtiny_cleanup_state_local(&state
);
1042 exc
= dom_node_get_next_sibling(child
,
1043 (dom_node
**) (void *) &next
);
1044 dom_node_unref(child
);
1045 if (exc
!= DOM_NO_ERR
) {
1046 svgtiny_cleanup_state_local(&state
);
1047 return svgtiny_LIBDOM_ERROR
;
1052 svgtiny_cleanup_state_local(&state
);
1059 * Parse a <path> element node.
1061 * http://www.w3.org/TR/SVG11/paths#PathElement
1064 svgtiny_code
svgtiny_parse_path(dom_element
*path
,
1065 struct svgtiny_parse_state state
)
1068 dom_string
*path_d_str
;
1071 float *p
; /* path elemets */
1072 unsigned int palloc
; /* number of path elements allocated */
1074 float last_x
= 0, last_y
= 0;
1075 float last_cubic_x
= 0, last_cubic_y
= 0;
1076 float last_quad_x
= 0, last_quad_y
= 0;
1077 float subpath_first_x
= 0, subpath_first_y
= 0;
1079 svgtiny_setup_state_local(&state
);
1081 svgtiny_parse_paint_attributes(path
, &state
);
1082 svgtiny_parse_transform_attributes(path
, &state
);
1084 /* read d attribute */
1085 exc
= dom_element_get_attribute(path
, state
.interned_d
, &path_d_str
);
1086 if (exc
!= DOM_NO_ERR
) {
1087 state
.diagram
->error_line
= -1; /* path->line; */
1088 state
.diagram
->error_message
= "path: error retrieving d attribute";
1089 svgtiny_cleanup_state_local(&state
);
1090 return svgtiny_SVG_ERROR
;
1093 if (path_d_str
== NULL
) {
1094 state
.diagram
->error_line
= -1; /* path->line; */
1095 state
.diagram
->error_message
= "path: missing d attribute";
1096 svgtiny_cleanup_state_local(&state
);
1097 return svgtiny_SVG_ERROR
;
1100 /* empty path is permitted it just disables the path */
1101 palloc
= dom_string_byte_length(path_d_str
);
1103 dom_string_unref(path_d_str
);
1104 svgtiny_cleanup_state_local(&state
);
1108 /* local copy of the path data allowing in-place modification */
1109 s
= path_d
= strndup(dom_string_data(path_d_str
), palloc
);
1110 dom_string_unref(path_d_str
);
1112 svgtiny_cleanup_state_local(&state
);
1113 return svgtiny_OUT_OF_MEMORY
;
1116 /* ensure path element allocation is sensibly bounded */
1119 } else if (palloc
> 64) {
1120 palloc
= palloc
/ 2;
1123 /* allocate initial space for path elements */
1124 p
= malloc(sizeof p
[0] * palloc
);
1127 svgtiny_cleanup_state_local(&state
);
1128 return svgtiny_OUT_OF_MEMORY
;
1131 /* parse d and build path */
1132 for (i
= 0; s
[i
]; i
++)
1139 float x
, y
, x1
, y1
, x2
, y2
, rx
, ry
, rotation
, large_arc
, sweep
;
1142 /* Ensure there is sufficient space for path elements */
1143 #define ALLOC_PATH_ELEMENTS(NUM_ELEMENTS) \
1145 if ((palloc - i) < NUM_ELEMENTS) { \
1147 palloc = (palloc * 2) + (palloc / 2); \
1148 tp = realloc(p, sizeof p[0] * palloc); \
1152 svgtiny_cleanup_state_local(&state); \
1153 return svgtiny_OUT_OF_MEMORY; \
1160 /* moveto (M, m), lineto (L, l) (2 arguments) */
1161 if (sscanf(s
, " %1[MmLl] %f %f %n", command
, &x
, &y
, &n
) == 3) {
1162 /*LOG(("moveto or lineto"));*/
1163 if (*command
== 'M' || *command
== 'm')
1164 plot_command
= svgtiny_PATH_MOVE
;
1166 plot_command
= svgtiny_PATH_LINE
;
1168 ALLOC_PATH_ELEMENTS(3);
1169 p
[i
++] = plot_command
;
1170 if ('a' <= *command
) {
1174 if (plot_command
== svgtiny_PATH_MOVE
) {
1175 subpath_first_x
= x
;
1176 subpath_first_y
= y
;
1178 p
[i
++] = last_cubic_x
= last_quad_x
= last_x
1180 p
[i
++] = last_cubic_y
= last_quad_y
= last_y
1183 plot_command
= svgtiny_PATH_LINE
;
1184 } while (sscanf(s
, "%f %f %n", &x
, &y
, &n
) == 2);
1186 /* closepath (Z, z) (no arguments) */
1187 } else if (sscanf(s
, " %1[Zz] %n", command
, &n
) == 1) {
1188 /*LOG(("closepath"));*/
1189 ALLOC_PATH_ELEMENTS(1);
1191 p
[i
++] = svgtiny_PATH_CLOSE
;
1193 last_cubic_x
= last_quad_x
= last_x
= subpath_first_x
;
1194 last_cubic_y
= last_quad_y
= last_y
= subpath_first_y
;
1196 /* horizontal lineto (H, h) (1 argument) */
1197 } else if (sscanf(s
, " %1[Hh] %f %n", command
, &x
, &n
) == 2) {
1198 /*LOG(("horizontal lineto"));*/
1200 ALLOC_PATH_ELEMENTS(3);
1202 p
[i
++] = svgtiny_PATH_LINE
;
1203 if (*command
== 'h')
1205 p
[i
++] = last_cubic_x
= last_quad_x
= last_x
1207 p
[i
++] = last_cubic_y
= last_quad_y
= last_y
;
1209 } while (sscanf(s
, "%f %n", &x
, &n
) == 1);
1211 /* vertical lineto (V, v) (1 argument) */
1212 } else if (sscanf(s
, " %1[Vv] %f %n", command
, &y
, &n
) == 2) {
1213 /*LOG(("vertical lineto"));*/
1215 ALLOC_PATH_ELEMENTS(3);
1217 p
[i
++] = svgtiny_PATH_LINE
;
1218 if (*command
== 'v')
1220 p
[i
++] = last_cubic_x
= last_quad_x
= last_x
;
1221 p
[i
++] = last_cubic_y
= last_quad_y
= last_y
1224 } while (sscanf(s
, "%f %n", &y
, &n
) == 1);
1226 /* curveto (C, c) (6 arguments) */
1227 } else if (sscanf(s
, " %1[Cc] %f %f %f %f %f %f %n", command
,
1228 &x1
, &y1
, &x2
, &y2
, &x
, &y
, &n
) == 7) {
1229 /*LOG(("curveto"));*/
1231 ALLOC_PATH_ELEMENTS(7);
1233 p
[i
++] = svgtiny_PATH_BEZIER
;
1234 if (*command
== 'c') {
1244 p
[i
++] = last_cubic_x
= x2
;
1245 p
[i
++] = last_cubic_y
= y2
;
1246 p
[i
++] = last_quad_x
= last_x
= x
;
1247 p
[i
++] = last_quad_y
= last_y
= y
;
1249 } while (sscanf(s
, "%f %f %f %f %f %f %n",
1250 &x1
, &y1
, &x2
, &y2
, &x
, &y
, &n
) == 6);
1252 /* shorthand/smooth curveto (S, s) (4 arguments) */
1253 } else if (sscanf(s
, " %1[Ss] %f %f %f %f %n", command
,
1254 &x2
, &y2
, &x
, &y
, &n
) == 5) {
1255 /*LOG(("shorthand/smooth curveto"));*/
1257 ALLOC_PATH_ELEMENTS(7);
1259 p
[i
++] = svgtiny_PATH_BEZIER
;
1260 x1
= last_x
+ (last_x
- last_cubic_x
);
1261 y1
= last_y
+ (last_y
- last_cubic_y
);
1262 if (*command
== 's') {
1270 p
[i
++] = last_cubic_x
= x2
;
1271 p
[i
++] = last_cubic_y
= y2
;
1272 p
[i
++] = last_quad_x
= last_x
= x
;
1273 p
[i
++] = last_quad_y
= last_y
= y
;
1275 } while (sscanf(s
, "%f %f %f %f %n",
1276 &x2
, &y2
, &x
, &y
, &n
) == 4);
1278 /* quadratic Bezier curveto (Q, q) (4 arguments) */
1279 } else if (sscanf(s
, " %1[Qq] %f %f %f %f %n", command
,
1280 &x1
, &y1
, &x
, &y
, &n
) == 5) {
1281 /*LOG(("quadratic Bezier curveto"));*/
1283 ALLOC_PATH_ELEMENTS(7);
1285 p
[i
++] = svgtiny_PATH_BEZIER
;
1288 if (*command
== 'q') {
1294 p
[i
++] = 1./3 * last_x
+ 2./3 * x1
;
1295 p
[i
++] = 1./3 * last_y
+ 2./3 * y1
;
1296 p
[i
++] = 2./3 * x1
+ 1./3 * x
;
1297 p
[i
++] = 2./3 * y1
+ 1./3 * y
;
1298 p
[i
++] = last_cubic_x
= last_x
= x
;
1299 p
[i
++] = last_cubic_y
= last_y
= y
;
1301 } while (sscanf(s
, "%f %f %f %f %n",
1302 &x1
, &y1
, &x
, &y
, &n
) == 4);
1304 /* shorthand/smooth quadratic Bezier curveto (T, t)
1306 } else if (sscanf(s
, " %1[Tt] %f %f %n", command
,
1308 /*LOG(("shorthand/smooth quadratic Bezier curveto"));*/
1310 ALLOC_PATH_ELEMENTS(7);
1312 p
[i
++] = svgtiny_PATH_BEZIER
;
1313 x1
= last_x
+ (last_x
- last_quad_x
);
1314 y1
= last_y
+ (last_y
- last_quad_y
);
1317 if (*command
== 't') {
1323 p
[i
++] = 1./3 * last_x
+ 2./3 * x1
;
1324 p
[i
++] = 1./3 * last_y
+ 2./3 * y1
;
1325 p
[i
++] = 2./3 * x1
+ 1./3 * x
;
1326 p
[i
++] = 2./3 * y1
+ 1./3 * y
;
1327 p
[i
++] = last_cubic_x
= last_x
= x
;
1328 p
[i
++] = last_cubic_y
= last_y
= y
;
1330 } while (sscanf(s
, "%f %f %n",
1333 /* elliptical arc (A, a) (7 arguments) */
1334 } else if (sscanf(s
, " %1[Aa] %f %f %f %f %f %f %f %n", command
,
1335 &rx
, &ry
, &rotation
, &large_arc
, &sweep
,
1339 double bzpoints
[6*4]; /* allow for up to four bezier segments per arc */
1341 if (*command
== 'a') {
1346 bzsegments
= svgarc_to_bezier(last_x
, last_y
,
1353 if (bzsegments
== -1) {
1355 ALLOC_PATH_ELEMENTS(3);
1356 p
[i
++] = svgtiny_PATH_LINE
;
1359 } else if (bzsegments
> 0) {
1361 ALLOC_PATH_ELEMENTS((unsigned int)bzsegments
* 7);
1362 for (bzpnt
= 0;bzpnt
< (bzsegments
* 6); bzpnt
+=6) {
1363 p
[i
++] = svgtiny_PATH_BEZIER
;
1364 p
[i
++] = bzpoints
[bzpnt
];
1365 p
[i
++] = bzpoints
[bzpnt
+1];
1366 p
[i
++] = bzpoints
[bzpnt
+2];
1367 p
[i
++] = bzpoints
[bzpnt
+3];
1368 p
[i
++] = bzpoints
[bzpnt
+4];
1369 p
[i
++] = bzpoints
[bzpnt
+5];
1372 if (bzsegments
!= 0) {
1373 last_cubic_x
= last_quad_x
= last_x
= p
[i
-2];
1374 last_cubic_y
= last_quad_y
= last_y
= p
[i
-1];
1379 } while (sscanf(s
, "%f %f %f %f %f %f %f %n",
1380 &rx
, &ry
, &rotation
, &large_arc
, &sweep
,
1384 /* fprintf(stderr, "parse failed at \"%s\"\n", s); */
1392 /* no real segments in path */
1394 svgtiny_cleanup_state_local(&state
);
1398 /* resize path element array to not be over allocated */
1402 /* try the resize, if it fails just continue to use the old
1405 tp
= realloc(p
, sizeof p
[0] * i
);
1411 err
= svgtiny_add_path(p
, i
, &state
);
1413 svgtiny_cleanup_state_local(&state
);
1420 * Parse a <rect> element node.
1422 * http://www.w3.org/TR/SVG11/shapes#RectElement
1425 svgtiny_code
svgtiny_parse_rect(dom_element
*rect
,
1426 struct svgtiny_parse_state state
)
1429 float x
, y
, width
, height
;
1432 svgtiny_setup_state_local(&state
);
1434 svgtiny_parse_position_attributes(rect
, state
,
1435 &x
, &y
, &width
, &height
);
1436 svgtiny_parse_paint_attributes(rect
, &state
);
1437 svgtiny_parse_transform_attributes(rect
, &state
);
1439 p
= malloc(13 * sizeof p
[0]);
1441 svgtiny_cleanup_state_local(&state
);
1442 return svgtiny_OUT_OF_MEMORY
;
1445 p
[0] = svgtiny_PATH_MOVE
;
1448 p
[3] = svgtiny_PATH_LINE
;
1451 p
[6] = svgtiny_PATH_LINE
;
1454 p
[9] = svgtiny_PATH_LINE
;
1457 p
[12] = svgtiny_PATH_CLOSE
;
1459 err
= svgtiny_add_path(p
, 13, &state
);
1461 svgtiny_cleanup_state_local(&state
);
1468 * Parse a <circle> element node.
1471 svgtiny_code
svgtiny_parse_circle(dom_element
*circle
,
1472 struct svgtiny_parse_state state
)
1475 float x
= 0, y
= 0, r
= -1;
1480 svgtiny_setup_state_local(&state
);
1482 exc
= dom_element_get_attribute(circle
, state
.interned_cx
, &attr
);
1483 if (exc
!= DOM_NO_ERR
) {
1484 svgtiny_cleanup_state_local(&state
);
1485 return svgtiny_LIBDOM_ERROR
;
1488 x
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1490 dom_string_unref(attr
);
1492 exc
= dom_element_get_attribute(circle
, state
.interned_cy
, &attr
);
1493 if (exc
!= DOM_NO_ERR
) {
1494 svgtiny_cleanup_state_local(&state
);
1495 return svgtiny_LIBDOM_ERROR
;
1498 y
= svgtiny_parse_length(attr
, state
.viewport_height
, state
);
1500 dom_string_unref(attr
);
1502 exc
= dom_element_get_attribute(circle
, state
.interned_r
, &attr
);
1503 if (exc
!= DOM_NO_ERR
) {
1504 svgtiny_cleanup_state_local(&state
);
1505 return svgtiny_LIBDOM_ERROR
;
1508 r
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1510 dom_string_unref(attr
);
1512 svgtiny_parse_paint_attributes(circle
, &state
);
1513 svgtiny_parse_transform_attributes(circle
, &state
);
1516 state
.diagram
->error_line
= -1; /* circle->line; */
1517 state
.diagram
->error_message
= "circle: r missing or negative";
1518 svgtiny_cleanup_state_local(&state
);
1519 return svgtiny_SVG_ERROR
;
1522 svgtiny_cleanup_state_local(&state
);
1526 p
= malloc(32 * sizeof p
[0]);
1528 svgtiny_cleanup_state_local(&state
);
1529 return svgtiny_OUT_OF_MEMORY
;
1532 p
[0] = svgtiny_PATH_MOVE
;
1535 p
[3] = svgtiny_PATH_BEZIER
;
1537 p
[5] = y
+ r
* KAPPA
;
1538 p
[6] = x
+ r
* KAPPA
;
1542 p
[10] = svgtiny_PATH_BEZIER
;
1543 p
[11] = x
- r
* KAPPA
;
1546 p
[14] = y
+ r
* KAPPA
;
1549 p
[17] = svgtiny_PATH_BEZIER
;
1551 p
[19] = y
- r
* KAPPA
;
1552 p
[20] = x
- r
* KAPPA
;
1556 p
[24] = svgtiny_PATH_BEZIER
;
1557 p
[25] = x
+ r
* KAPPA
;
1560 p
[28] = y
- r
* KAPPA
;
1563 p
[31] = svgtiny_PATH_CLOSE
;
1565 err
= svgtiny_add_path(p
, 32, &state
);
1567 svgtiny_cleanup_state_local(&state
);
1574 * Parse an <ellipse> element node.
1577 svgtiny_code
svgtiny_parse_ellipse(dom_element
*ellipse
,
1578 struct svgtiny_parse_state state
)
1581 float x
= 0, y
= 0, rx
= -1, ry
= -1;
1586 svgtiny_setup_state_local(&state
);
1588 exc
= dom_element_get_attribute(ellipse
, state
.interned_cx
, &attr
);
1589 if (exc
!= DOM_NO_ERR
) {
1590 svgtiny_cleanup_state_local(&state
);
1591 return svgtiny_LIBDOM_ERROR
;
1594 x
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1596 dom_string_unref(attr
);
1598 exc
= dom_element_get_attribute(ellipse
, state
.interned_cy
, &attr
);
1599 if (exc
!= DOM_NO_ERR
) {
1600 svgtiny_cleanup_state_local(&state
);
1601 return svgtiny_LIBDOM_ERROR
;
1604 y
= svgtiny_parse_length(attr
, state
.viewport_height
, state
);
1606 dom_string_unref(attr
);
1608 exc
= dom_element_get_attribute(ellipse
, state
.interned_rx
, &attr
);
1609 if (exc
!= DOM_NO_ERR
) {
1610 svgtiny_cleanup_state_local(&state
);
1611 return svgtiny_LIBDOM_ERROR
;
1614 rx
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1616 dom_string_unref(attr
);
1618 exc
= dom_element_get_attribute(ellipse
, state
.interned_ry
, &attr
);
1619 if (exc
!= DOM_NO_ERR
) {
1620 svgtiny_cleanup_state_local(&state
);
1621 return svgtiny_LIBDOM_ERROR
;
1624 ry
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1626 dom_string_unref(attr
);
1628 svgtiny_parse_paint_attributes(ellipse
, &state
);
1629 svgtiny_parse_transform_attributes(ellipse
, &state
);
1631 if (rx
< 0 || ry
< 0) {
1632 state
.diagram
->error_line
= -1; /* ellipse->line; */
1633 state
.diagram
->error_message
= "ellipse: rx or ry missing "
1635 svgtiny_cleanup_state_local(&state
);
1636 return svgtiny_SVG_ERROR
;
1638 if (rx
== 0 || ry
== 0) {
1639 svgtiny_cleanup_state_local(&state
);
1643 p
= malloc(32 * sizeof p
[0]);
1645 svgtiny_cleanup_state_local(&state
);
1646 return svgtiny_OUT_OF_MEMORY
;
1649 p
[0] = svgtiny_PATH_MOVE
;
1652 p
[3] = svgtiny_PATH_BEZIER
;
1654 p
[5] = y
+ ry
* KAPPA
;
1655 p
[6] = x
+ rx
* KAPPA
;
1659 p
[10] = svgtiny_PATH_BEZIER
;
1660 p
[11] = x
- rx
* KAPPA
;
1663 p
[14] = y
+ ry
* KAPPA
;
1666 p
[17] = svgtiny_PATH_BEZIER
;
1668 p
[19] = y
- ry
* KAPPA
;
1669 p
[20] = x
- rx
* KAPPA
;
1673 p
[24] = svgtiny_PATH_BEZIER
;
1674 p
[25] = x
+ rx
* KAPPA
;
1677 p
[28] = y
- ry
* KAPPA
;
1680 p
[31] = svgtiny_PATH_CLOSE
;
1682 err
= svgtiny_add_path(p
, 32, &state
);
1684 svgtiny_cleanup_state_local(&state
);
1691 * Parse a <line> element node.
1694 svgtiny_code
svgtiny_parse_line(dom_element
*line
,
1695 struct svgtiny_parse_state state
)
1698 float x1
= 0, y1
= 0, x2
= 0, y2
= 0;
1703 svgtiny_setup_state_local(&state
);
1705 exc
= dom_element_get_attribute(line
, state
.interned_x1
, &attr
);
1706 if (exc
!= DOM_NO_ERR
) {
1707 svgtiny_cleanup_state_local(&state
);
1708 return svgtiny_LIBDOM_ERROR
;
1711 x1
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1713 dom_string_unref(attr
);
1715 exc
= dom_element_get_attribute(line
, state
.interned_y1
, &attr
);
1716 if (exc
!= DOM_NO_ERR
) {
1717 svgtiny_cleanup_state_local(&state
);
1718 return svgtiny_LIBDOM_ERROR
;
1721 y1
= svgtiny_parse_length(attr
, state
.viewport_height
, state
);
1723 dom_string_unref(attr
);
1725 exc
= dom_element_get_attribute(line
, state
.interned_x2
, &attr
);
1726 if (exc
!= DOM_NO_ERR
) {
1727 svgtiny_cleanup_state_local(&state
);
1728 return svgtiny_LIBDOM_ERROR
;
1731 x2
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1733 dom_string_unref(attr
);
1735 exc
= dom_element_get_attribute(line
, state
.interned_y2
, &attr
);
1736 if (exc
!= DOM_NO_ERR
) {
1737 svgtiny_cleanup_state_local(&state
);
1738 return svgtiny_LIBDOM_ERROR
;
1741 y2
= svgtiny_parse_length(attr
, state
.viewport_height
, state
);
1743 dom_string_unref(attr
);
1745 svgtiny_parse_paint_attributes(line
, &state
);
1746 svgtiny_parse_transform_attributes(line
, &state
);
1748 p
= malloc(7 * sizeof p
[0]);
1750 svgtiny_cleanup_state_local(&state
);
1751 return svgtiny_OUT_OF_MEMORY
;
1754 p
[0] = svgtiny_PATH_MOVE
;
1757 p
[3] = svgtiny_PATH_LINE
;
1760 p
[6] = svgtiny_PATH_CLOSE
;
1762 err
= svgtiny_add_path(p
, 7, &state
);
1764 svgtiny_cleanup_state_local(&state
);
1771 * Parse a <polyline> or <polygon> element node.
1773 * http://www.w3.org/TR/SVG11/shapes#PolylineElement
1774 * http://www.w3.org/TR/SVG11/shapes#PolygonElement
1777 svgtiny_code
svgtiny_parse_poly(dom_element
*poly
,
1778 struct svgtiny_parse_state state
, bool polygon
)
1781 dom_string
*points_str
;
1787 svgtiny_setup_state_local(&state
);
1789 svgtiny_parse_paint_attributes(poly
, &state
);
1790 svgtiny_parse_transform_attributes(poly
, &state
);
1792 exc
= dom_element_get_attribute(poly
, state
.interned_points
,
1794 if (exc
!= DOM_NO_ERR
) {
1795 svgtiny_cleanup_state_local(&state
);
1796 return svgtiny_LIBDOM_ERROR
;
1799 if (points_str
== NULL
) {
1800 state
.diagram
->error_line
= -1; /* poly->line; */
1801 state
.diagram
->error_message
=
1802 "polyline/polygon: missing points attribute";
1803 svgtiny_cleanup_state_local(&state
);
1804 return svgtiny_SVG_ERROR
;
1807 s
= points
= strndup(dom_string_data(points_str
),
1808 dom_string_byte_length(points_str
));
1809 dom_string_unref(points_str
);
1810 /* read points attribute */
1812 svgtiny_cleanup_state_local(&state
);
1813 return svgtiny_OUT_OF_MEMORY
;
1815 /* allocate space for path: it will never have more elements than s */
1816 p
= malloc(sizeof p
[0] * strlen(s
));
1819 svgtiny_cleanup_state_local(&state
);
1820 return svgtiny_OUT_OF_MEMORY
;
1823 /* parse s and build path */
1824 for (i
= 0; s
[i
]; i
++)
1832 if (sscanf(s
, "%f %f %n", &x
, &y
, &n
) == 2) {
1834 p
[i
++] = svgtiny_PATH_MOVE
;
1836 p
[i
++] = svgtiny_PATH_LINE
;
1845 p
[i
++] = svgtiny_PATH_CLOSE
;
1849 err
= svgtiny_add_path(p
, i
, &state
);
1851 svgtiny_cleanup_state_local(&state
);
1858 * Parse a <text> or <tspan> element node.
1861 svgtiny_code
svgtiny_parse_text(dom_element
*text
,
1862 struct svgtiny_parse_state state
)
1864 float x
, y
, width
, height
;
1869 svgtiny_setup_state_local(&state
);
1871 svgtiny_parse_position_attributes(text
, state
,
1872 &x
, &y
, &width
, &height
);
1873 svgtiny_parse_font_attributes(text
, &state
);
1874 svgtiny_parse_transform_attributes(text
, &state
);
1876 px
= state
.ctm
.a
* x
+ state
.ctm
.c
* y
+ state
.ctm
.e
;
1877 py
= state
.ctm
.b
* x
+ state
.ctm
.d
* y
+ state
.ctm
.f
;
1878 /* state.ctm.e = px - state.origin_x; */
1879 /* state.ctm.f = py - state.origin_y; */
1881 exc
= dom_node_get_first_child(text
, &child
);
1882 if (exc
!= DOM_NO_ERR
) {
1883 return svgtiny_LIBDOM_ERROR
;
1884 svgtiny_cleanup_state_local(&state
);
1886 while (child
!= NULL
) {
1888 dom_node_type nodetype
;
1889 svgtiny_code code
= svgtiny_OK
;
1891 exc
= dom_node_get_node_type(child
, &nodetype
);
1892 if (exc
!= DOM_NO_ERR
) {
1893 dom_node_unref(child
);
1894 svgtiny_cleanup_state_local(&state
);
1895 return svgtiny_LIBDOM_ERROR
;
1897 if (nodetype
== DOM_ELEMENT_NODE
) {
1898 dom_string
*nodename
;
1899 exc
= dom_node_get_node_name(child
, &nodename
);
1900 if (exc
!= DOM_NO_ERR
) {
1901 dom_node_unref(child
);
1902 svgtiny_cleanup_state_local(&state
);
1903 return svgtiny_LIBDOM_ERROR
;
1905 if (dom_string_caseless_isequal(nodename
,
1906 state
.interned_tspan
))
1907 code
= svgtiny_parse_text((dom_element
*)child
,
1909 dom_string_unref(nodename
);
1910 } else if (nodetype
== DOM_TEXT_NODE
) {
1911 struct svgtiny_shape
*shape
= svgtiny_add_shape(&state
);
1912 dom_string
*content
;
1913 if (shape
== NULL
) {
1914 dom_node_unref(child
);
1915 svgtiny_cleanup_state_local(&state
);
1916 return svgtiny_OUT_OF_MEMORY
;
1918 exc
= dom_text_get_whole_text(child
, &content
);
1919 if (exc
!= DOM_NO_ERR
) {
1920 dom_node_unref(child
);
1921 svgtiny_cleanup_state_local(&state
);
1922 return svgtiny_LIBDOM_ERROR
;
1924 if (content
!= NULL
) {
1925 shape
->text
= strndup(dom_string_data(content
),
1926 dom_string_byte_length(content
));
1927 dom_string_unref(content
);
1929 shape
->text
= strdup("");
1933 state
.diagram
->shape_count
++;
1936 if (code
!= svgtiny_OK
) {
1937 dom_node_unref(child
);
1938 svgtiny_cleanup_state_local(&state
);
1941 exc
= dom_node_get_next_sibling(child
, &next
);
1942 dom_node_unref(child
);
1943 if (exc
!= DOM_NO_ERR
) {
1944 svgtiny_cleanup_state_local(&state
);
1945 return svgtiny_LIBDOM_ERROR
;
1950 svgtiny_cleanup_state_local(&state
);
1957 * Parse x, y, width, and height attributes, if present.
1960 void svgtiny_parse_position_attributes(dom_element
*node
,
1961 const struct svgtiny_parse_state state
,
1962 float *x
, float *y
, float *width
, float *height
)
1969 *width
= state
.viewport_width
;
1970 *height
= state
.viewport_height
;
1972 exc
= dom_element_get_attribute(node
, state
.interned_x
, &attr
);
1973 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
1974 *x
= svgtiny_parse_length(attr
, state
.viewport_width
, state
);
1975 dom_string_unref(attr
);
1978 exc
= dom_element_get_attribute(node
, state
.interned_y
, &attr
);
1979 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
1980 *y
= svgtiny_parse_length(attr
, state
.viewport_height
, state
);
1981 dom_string_unref(attr
);
1984 exc
= dom_element_get_attribute(node
, state
.interned_width
, &attr
);
1985 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
1986 *width
= svgtiny_parse_length(attr
, state
.viewport_width
,
1988 dom_string_unref(attr
);
1991 exc
= dom_element_get_attribute(node
, state
.interned_height
, &attr
);
1992 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
1993 *height
= svgtiny_parse_length(attr
, state
.viewport_height
,
1995 dom_string_unref(attr
);
2001 * Parse a length as a number of pixels.
2004 static float _svgtiny_parse_length(const char *s
, int viewport_size
,
2005 const struct svgtiny_parse_state state
)
2007 int num_length
= strspn(s
, "0123456789+-.");
2008 const char *unit
= s
+ num_length
;
2009 float n
= atof((const char *) s
);
2010 float font_size
= 20;
2016 } else if (unit
[0] == '%') {
2017 return n
/ 100.0 * viewport_size
;
2018 } else if (unit
[0] == 'e' && unit
[1] == 'm') {
2019 return n
* font_size
;
2020 } else if (unit
[0] == 'e' && unit
[1] == 'x') {
2021 return n
/ 2.0 * font_size
;
2022 } else if (unit
[0] == 'p' && unit
[1] == 'x') {
2024 } else if (unit
[0] == 'p' && unit
[1] == 't') {
2026 } else if (unit
[0] == 'p' && unit
[1] == 'c') {
2028 } else if (unit
[0] == 'm' && unit
[1] == 'm') {
2029 return n
* 3.543307;
2030 } else if (unit
[0] == 'c' && unit
[1] == 'm') {
2031 return n
* 35.43307;
2032 } else if (unit
[0] == 'i' && unit
[1] == 'n') {
2039 float svgtiny_parse_length(dom_string
*s
, int viewport_size
,
2040 const struct svgtiny_parse_state state
)
2042 char *ss
= strndup(dom_string_data(s
), dom_string_byte_length(s
));
2043 float ret
= _svgtiny_parse_length(ss
, viewport_size
, state
);
2049 * Parse paint attributes, if present.
2052 void svgtiny_parse_paint_attributes(dom_element
*node
,
2053 struct svgtiny_parse_state
*state
)
2058 /* We store the result of svgtiny_parse_style_inline() in
2059 * inline_sheet, and that function returns NULL on error; in
2060 * particular you do not need to css_stylesheet_destroy() the
2061 * result if it is NULL. We initialize inline_sheet to NULL to
2062 * retain the same semantics. */
2063 css_stylesheet
*inline_sheet
= NULL
;
2065 exc
= dom_element_get_attribute(node
, state
->interned_fill
, &attr
);
2066 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
2067 svgtiny_parse_color(attr
, &state
->fill
, &state
->fill_grad
, state
);
2068 dom_string_unref(attr
);
2071 exc
= dom_element_get_attribute(node
, state
->interned_stroke
, &attr
);
2072 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
2073 svgtiny_parse_color(attr
, &state
->stroke
, &state
->stroke_grad
, state
);
2074 dom_string_unref(attr
);
2077 exc
= dom_element_get_attribute(node
, state
->interned_stroke_width
, &attr
);
2078 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
2079 state
->stroke_width
= svgtiny_parse_length(attr
,
2080 state
->viewport_width
, *state
);
2081 dom_string_unref(attr
);
2084 exc
= dom_element_get_attribute(node
, state
->interned_style
, &attr
);
2085 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
2086 /* First parse the style attribute into a libcss stylesheet
2087 in case any of its properties are known to libcss. */
2088 inline_sheet
= svgtiny_parse_style_inline(
2089 (uint8_t *)dom_string_data(attr
),
2090 dom_string_byte_length(attr
));
2092 /* Parse any other properties "by hand" until they can
2093 be supported in libcss. */
2094 char *style
= strndup(dom_string_data(attr
),
2095 dom_string_byte_length(attr
));
2098 if ((s
= strstr(style
, "fill:"))) {
2102 value
= strndup(s
, strcspn(s
, "; "));
2103 _svgtiny_parse_color(value
, &state
->fill
, &state
->fill_grad
, state
);
2106 if ((s
= strstr(style
, "stroke:"))) {
2110 value
= strndup(s
, strcspn(s
, "; "));
2111 _svgtiny_parse_color(value
, &state
->stroke
, &state
->stroke_grad
, state
);
2114 if ((s
= strstr(style
, "stroke-width:"))) {
2118 value
= strndup(s
, strcspn(s
, "; "));
2119 state
->stroke_width
= _svgtiny_parse_length(value
,
2120 state
->viewport_width
, *state
);
2124 dom_string_unref(attr
);
2127 if (inline_sheet
!= NULL
) {
2128 css_stylesheet_destroy(inline_sheet
);
2137 static void _svgtiny_parse_color(const char *s
, svgtiny_colour
*c
,
2138 struct svgtiny_parse_state_gradient
*grad
,
2139 struct svgtiny_parse_state
*state
)
2141 unsigned int r
, g
, b
;
2143 size_t len
= strlen(s
);
2144 char *id
= 0, *rparen
;
2146 if (len
== 4 && s
[0] == '#') {
2147 if (sscanf(s
+ 1, "%1x%1x%1x", &r
, &g
, &b
) == 3)
2148 *c
= svgtiny_RGB(r
| r
<< 4, g
| g
<< 4, b
| b
<< 4);
2150 } else if (len
== 7 && s
[0] == '#') {
2151 if (sscanf(s
+ 1, "%2x%2x%2x", &r
, &g
, &b
) == 3)
2152 *c
= svgtiny_RGB(r
, g
, b
);
2154 } else if (10 <= len
&& s
[0] == 'r' && s
[1] == 'g' && s
[2] == 'b' &&
2155 s
[3] == '(' && s
[len
- 1] == ')') {
2156 if (sscanf(s
+ 4, "%u,%u,%u", &r
, &g
, &b
) == 3)
2157 *c
= svgtiny_RGB(r
, g
, b
);
2158 else if (sscanf(s
+ 4, "%f%%,%f%%,%f%%", &rf
, &gf
, &bf
) == 3) {
2162 *c
= svgtiny_RGB(r
, g
, b
);
2165 } else if (len
== 4 && strcmp(s
, "none") == 0) {
2166 *c
= svgtiny_TRANSPARENT
;
2168 } else if (5 < len
&& s
[0] == 'u' && s
[1] == 'r' && s
[2] == 'l' &&
2171 *c
= svgtiny_RGB(0, 0, 0);
2172 } else if (s
[4] == '#') {
2176 rparen
= strchr(id
, ')');
2179 svgtiny_find_gradient(id
, grad
, state
);
2181 if (grad
->linear_gradient_stop_count
== 0)
2182 *c
= svgtiny_TRANSPARENT
;
2183 else if (grad
->linear_gradient_stop_count
== 1)
2184 *c
= grad
->gradient_stop
[0].color
;
2186 *c
= svgtiny_LINEAR_GRADIENT
;
2190 const struct svgtiny_named_color
*named_color
;
2191 named_color
= svgtiny_color_lookup(s
, strlen(s
));
2193 *c
= named_color
->color
;
2197 void svgtiny_parse_color(dom_string
*s
, svgtiny_colour
*c
,
2198 struct svgtiny_parse_state_gradient
*grad
,
2199 struct svgtiny_parse_state
*state
)
2202 _svgtiny_parse_color(dom_string_data(s
), c
, grad
, state
);
2203 dom_string_unref(s
);
2207 * Parse font attributes, if present.
2210 void svgtiny_parse_font_attributes(dom_element
*node
,
2211 struct svgtiny_parse_state
*state
)
2213 /* TODO: Implement this, it never used to be */
2216 #ifdef WRITTEN_THIS_PROPERLY
2217 const xmlAttr
*attr
;
2221 for (attr
= node
->properties
; attr
; attr
= attr
->next
) {
2222 if (strcmp((const char *) attr
->name
, "font-size") == 0) {
2231 * Parse transform attributes, if present.
2233 * http://www.w3.org/TR/SVG11/coords#TransformAttribute
2236 void svgtiny_parse_transform_attributes(dom_element
*node
,
2237 struct svgtiny_parse_state
*state
)
2243 exc
= dom_element_get_attribute(node
, state
->interned_transform
,
2245 if (exc
== DOM_NO_ERR
&& attr
!= NULL
) {
2246 transform
= strndup(dom_string_data(attr
),
2247 dom_string_byte_length(attr
));
2248 svgtiny_parse_transform(transform
, &state
->ctm
.a
, &state
->ctm
.b
,
2249 &state
->ctm
.c
, &state
->ctm
.d
,
2250 &state
->ctm
.e
, &state
->ctm
.f
);
2252 dom_string_unref(attr
);
2258 * Parse a transform string.
2261 void svgtiny_parse_transform(char *s
, float *ma
, float *mb
,
2262 float *mc
, float *md
, float *me
, float *mf
)
2264 float a
, b
, c
, d
, e
, f
;
2265 float za
, zb
, zc
, zd
, ze
, zf
;
2270 for (i
= 0; s
[i
]; i
++)
2279 if ((sscanf(s
, " matrix (%f %f %f %f %f %f ) %n",
2280 &a
, &b
, &c
, &d
, &e
, &f
, &n
) == 6) && (n
> 0))
2282 else if ((sscanf(s
, " translate (%f %f ) %n",
2283 &e
, &f
, &n
) == 2) && (n
> 0))
2285 else if ((sscanf(s
, " translate (%f ) %n",
2286 &e
, &n
) == 1) && (n
> 0))
2288 else if ((sscanf(s
, " scale (%f %f ) %n",
2289 &a
, &d
, &n
) == 2) && (n
> 0))
2291 else if ((sscanf(s
, " scale (%f ) %n",
2292 &a
, &n
) == 1) && (n
> 0))
2294 else if ((sscanf(s
, " rotate (%f %f %f ) %n",
2295 &angle
, &x
, &y
, &n
) == 3) && (n
> 0)) {
2296 angle
= angle
/ 180 * M_PI
;
2301 e
= -x
* cos(angle
) + y
* sin(angle
) + x
;
2302 f
= -x
* sin(angle
) - y
* cos(angle
) + y
;
2303 } else if ((sscanf(s
, " rotate (%f ) %n",
2304 &angle
, &n
) == 1) && (n
> 0)) {
2305 angle
= angle
/ 180 * M_PI
;
2310 } else if ((sscanf(s
, " skewX (%f ) %n",
2311 &angle
, &n
) == 1) && (n
> 0)) {
2312 angle
= angle
/ 180 * M_PI
;
2314 } else if ((sscanf(s
, " skewY (%f ) %n",
2315 &angle
, &n
) == 1) && (n
> 0)) {
2316 angle
= angle
/ 180 * M_PI
;
2320 za
= *ma
* a
+ *mc
* b
;
2321 zb
= *mb
* a
+ *md
* b
;
2322 zc
= *ma
* c
+ *mc
* d
;
2323 zd
= *mb
* c
+ *md
* d
;
2324 ze
= *ma
* e
+ *mc
* f
+ *me
;
2325 zf
= *mb
* e
+ *md
* f
+ *mf
;
2338 * Add a path to the svgtiny_diagram.
2341 svgtiny_code
svgtiny_add_path(float *p
, unsigned int n
,
2342 struct svgtiny_parse_state
*state
)
2344 struct svgtiny_shape
*shape
;
2346 if (state
->fill
== svgtiny_LINEAR_GRADIENT
)
2347 return svgtiny_add_path_linear_gradient(p
, n
, state
);
2349 svgtiny_transform_path(p
, n
, state
);
2351 shape
= svgtiny_add_shape(state
);
2354 return svgtiny_OUT_OF_MEMORY
;
2357 shape
->path_length
= n
;
2358 state
->diagram
->shape_count
++;
2365 * Add a svgtiny_shape to the svgtiny_diagram.
2368 struct svgtiny_shape
*svgtiny_add_shape(struct svgtiny_parse_state
*state
)
2370 struct svgtiny_shape
*shape
= realloc(state
->diagram
->shape
,
2371 (state
->diagram
->shape_count
+ 1) *
2372 sizeof (state
->diagram
->shape
[0]));
2375 state
->diagram
->shape
= shape
;
2377 shape
+= state
->diagram
->shape_count
;
2379 shape
->path_length
= 0;
2381 shape
->fill
= state
->fill
;
2382 shape
->stroke
= state
->stroke
;
2383 shape
->stroke_width
= lroundf((float) state
->stroke_width
*
2384 (state
->ctm
.a
+ state
->ctm
.d
) / 2.0);
2385 if (0 < state
->stroke_width
&& shape
->stroke_width
== 0)
2386 shape
->stroke_width
= 1;
2393 * Apply the current transformation matrix to a path.
2396 void svgtiny_transform_path(float *p
, unsigned int n
,
2397 struct svgtiny_parse_state
*state
)
2401 for (j
= 0; j
!= n
; ) {
2402 unsigned int points
= 0;
2404 switch ((int) p
[j
]) {
2405 case svgtiny_PATH_MOVE
:
2406 case svgtiny_PATH_LINE
:
2409 case svgtiny_PATH_CLOSE
:
2412 case svgtiny_PATH_BEZIER
:
2419 for (k
= 0; k
!= points
; k
++) {
2420 float x0
= p
[j
], y0
= p
[j
+ 1];
2421 float x
= state
->ctm
.a
* x0
+ state
->ctm
.c
* y0
+
2423 float y
= state
->ctm
.b
* x0
+ state
->ctm
.d
* y0
+
2434 * Free all memory used by a diagram.
2437 void svgtiny_free(struct svgtiny_diagram
*svg
)
2442 for (i
= 0; i
!= svg
->shape_count
; i
++) {
2443 free(svg
->shape
[i
].path
);
2444 free(svg
->shape
[i
].text
);
2452 #ifndef HAVE_STRNDUP
2453 char *svgtiny_strndup(const char *s
, size_t n
)
2458 for (len
= 0; len
!= n
&& s
[len
]; len
++)
2461 s2
= malloc(len
+ 1);