1 #define __SP_GRADIENT_CHEMISTRY_C__
3 /*
4 * Various utility methods for gradients
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak
9 * Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
10 *
11 * Copyright (C) 2007 Johan Engelen
12 * Copyright (C) 2001-2005 authors
13 * Copyright (C) 2001 Ximian, Inc.
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
19 #include "style.h"
20 #include "document-private.h"
21 #include "desktop-style.h"
23 #include "sp-gradient-reference.h"
24 #include "sp-gradient-vector.h"
25 #include "sp-linear-gradient.h"
26 #include "sp-radial-gradient.h"
27 #include "sp-stop.h"
28 #include "widgets/gradient-vector.h"
30 #include "sp-text.h"
31 #include "sp-tspan.h"
32 #include <libnr/nr-matrix-fns.h>
33 #include "xml/repr.h"
34 #include "svg/svg.h"
35 #include "svg/svg-color.h"
38 // Terminology:
39 //
40 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
41 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
42 //
43 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
44 // radial). It references a vector for the actual colors. Each private is only used by one
45 // object. It is either linear or radial.
47 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
49 SPGradient *
50 sp_gradient_ensure_vector_normalized(SPGradient *gr)
51 {
52 g_return_val_if_fail(gr != NULL, NULL);
53 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
55 /* If we are already normalized vector, just return */
56 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
57 /* Fail, if we have wrong state set */
58 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
59 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
60 return NULL;
61 }
63 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
64 if (!gr->has_stops) {
65 /* We do not have stops ourselves, so flatten stops as well */
66 sp_gradient_ensure_vector(gr);
67 g_assert(gr->vector.built);
68 // this adds stops from gr->vector as children to gr
69 sp_gradient_repr_write_vector (gr);
70 }
72 /* If gr hrefs some other gradient, remove the href */
73 if (gr->ref->getObject()) {
74 /* We are hrefing someone, so require flattening */
75 SP_OBJECT(gr)->updateRepr(((SPObject *) gr)->repr, SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
76 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
77 }
79 /* Everything is OK, set state flag */
80 gr->state = SP_GRADIENT_STATE_VECTOR;
81 return gr;
82 }
84 /**
85 * Creates new private gradient for the given vector
86 */
88 static SPGradient *
89 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
90 {
91 g_return_val_if_fail(document != NULL, NULL);
92 g_return_val_if_fail(vector != NULL, NULL);
93 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
94 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
96 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
98 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
99 // create a new private gradient of the requested type
100 Inkscape::XML::Node *repr;
101 if (type == SP_GRADIENT_TYPE_LINEAR) {
102 repr = xml_doc->createElement("svg:linearGradient");
103 } else {
104 repr = xml_doc->createElement("svg:radialGradient");
105 }
107 // privates are garbage-collectable
108 repr->setAttribute("inkscape:collect", "always");
110 // link to vector
111 sp_gradient_repr_set_link(repr, vector);
113 /* Append the new private gradient to defs */
114 SP_OBJECT_REPR(defs)->appendChild(repr);
115 Inkscape::GC::release(repr);
117 // get corresponding object
118 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
119 g_assert(gr != NULL);
120 g_assert(SP_IS_GRADIENT(gr));
122 return gr;
123 }
125 /**
126 Count how many times gr is used by the styles of o and its descendants
127 */
128 guint
129 count_gradient_hrefs(SPObject *o, SPGradient *gr)
130 {
131 if (!o)
132 return 1;
134 guint i = 0;
136 SPStyle *style = SP_OBJECT_STYLE(o);
137 if (style
138 && style->fill.isPaintserver()
139 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
140 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
141 {
142 i ++;
143 }
144 if (style
145 && style->stroke.isPaintserver()
146 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
147 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
148 {
149 i ++;
150 }
152 for (SPObject *child = sp_object_first_child(o);
153 child != NULL; child = SP_OBJECT_NEXT(child)) {
154 i += count_gradient_hrefs(child, gr);
155 }
157 return i;
158 }
161 /**
162 * If gr has other users, create a new private; also check if gr links to vector, relink if not
163 */
164 SPGradient *
165 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
166 SPGradientType type, SPObject *o)
167 {
168 g_return_val_if_fail(gr != NULL, NULL);
169 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
171 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
172 // but i think we should not abort on this - maybe just write a validity warning into some sort
173 // of log
174 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
175 return (gr);
177 // user is the object that uses this gradient; normally it's item but for tspans, we
178 // check its ancestor text so that tspans don't get different gradients from their
179 // texts.
180 SPObject *user = o;
181 while (SP_IS_TSPAN(user)) {
182 user = SP_OBJECT_PARENT(user);
183 }
185 // Check the number of uses of the gradient within this object;
186 // if we are private and there are no other users,
187 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
188 // check vector
189 if ( gr != vector && gr->ref->getObject() != vector ) {
190 /* our href is not the vector, and vector is different from gr; relink */
191 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
192 }
193 return gr;
194 }
196 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
197 SPObject *defs = SP_DOCUMENT_DEFS(doc);
199 if ((gr->has_stops) ||
200 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
201 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
202 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
203 // we have to clone a fresh new private gradient for the given vector
205 // create an empty one
206 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
208 // copy all the attributes to it
209 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
210 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
211 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
212 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
213 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
214 if (SP_IS_RADIALGRADIENT(gr)) {
215 repr_new->setAttribute("cx", repr->attribute("cx"));
216 repr_new->setAttribute("cy", repr->attribute("cy"));
217 repr_new->setAttribute("fx", repr->attribute("fx"));
218 repr_new->setAttribute("fy", repr->attribute("fy"));
219 repr_new->setAttribute("r", repr->attribute("r"));
220 } else {
221 repr_new->setAttribute("x1", repr->attribute("x1"));
222 repr_new->setAttribute("y1", repr->attribute("y1"));
223 repr_new->setAttribute("x2", repr->attribute("x2"));
224 repr_new->setAttribute("y2", repr->attribute("y2"));
225 }
227 return gr_new;
228 } else {
229 return gr;
230 }
231 }
233 SPGradient *
234 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
235 {
236 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
237 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
238 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
240 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
241 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
242 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
243 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
244 Inkscape::GC::release(repr);
245 return gr_new;
246 }
247 return gr;
248 }
250 /**
251 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
252 */
253 SPGradient *
254 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
255 {
256 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
257 vector = sp_gradient_fork_vector_if_necessary (vector);
258 if ( gradient != vector && gradient->ref->getObject() != vector ) {
259 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
260 }
261 return vector;
262 }
265 /**
266 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
267 * instead. No forking or reapplying is done because this is only called for newly created privates.
268 * @return The new gradient.
269 */
270 SPGradient *
271 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
272 {
273 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
275 // calculate the bbox of the item
276 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
277 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
279 if ( !bbox || bbox->isEmpty() )
280 return gr;
282 NR::Coord const width = bbox->dimensions()[NR::X];
283 NR::Coord const height = bbox->dimensions()[NR::Y];
285 NR::Point const center = bbox->midpoint();
287 if (SP_IS_RADIALGRADIENT(gr)) {
288 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
289 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
290 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
291 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
292 sp_repr_set_svg_double(repr, "r", width/2);
294 // we want it to be elliptic, not circular
295 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
296 NR::Matrix (NR::scale(1, height/width)) *
297 NR::Matrix (NR::translate (center));
299 gr->gradientTransform = squeeze;
300 {
301 gchar *c=sp_svg_transform_write(gr->gradientTransform);
302 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
303 g_free(c);
304 }
305 } else {
306 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
307 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
308 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
309 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
310 }
312 // set the gradientUnits
313 repr->setAttribute("gradientUnits", "userSpaceOnUse");
315 return gr;
316 }
318 /**
319 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
320 * @return The new gradient.
321 */
322 SPGradient *
323 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
324 {
325 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
327 // First, fork it if it is shared
328 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
329 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
331 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
333 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
335 // calculate the bbox of the item
336 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
337 NR::Matrix bbox2user;
338 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
339 if ( bbox && !bbox->isEmpty() ) {
340 bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
341 0, bbox->dimensions()[NR::Y],
342 bbox->min()[NR::X], bbox->min()[NR::Y]);
343 } else {
344 // would be degenerate otherwise
345 bbox2user = NR::identity();
346 }
348 /* skew is the additional transform, defined by the proportions of the item, that we need
349 * to apply to the gradient in order to work around this weird bit from SVG 1.1
350 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
351 *
352 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
353 * matrix, the stripes of the linear gradient are perpendicular to the gradient
354 * vector in object bounding box space (i.e., the abstract coordinate system where
355 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
356 * bottom/right of the object bounding box). When the object's bounding box is not
357 * square, the stripes that are conceptually perpendicular to the gradient vector
358 * within object bounding box space will render non-perpendicular relative to the
359 * gradient vector in user space due to application of the non-uniform scaling
360 * transformation from bounding box space to user space.
361 */
362 NR::Matrix skew = bbox2user;
363 double exp = skew.expansion();
364 skew[0] /= exp;
365 skew[1] /= exp;
366 skew[2] /= exp;
367 skew[3] /= exp;
368 skew[4] = 0;
369 skew[5] = 0;
371 // apply skew to the gradient
372 gr->gradientTransform = skew;
373 {
374 gchar *c=sp_svg_transform_write(gr->gradientTransform);
375 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
376 g_free(c);
377 }
379 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
380 // as to cancel it out when it's applied to the gradient during rendering
381 NR::Matrix point_convert = bbox2user * skew.inverse();
383 if (SP_IS_RADIALGRADIENT(gr)) {
384 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
386 // original points in the bbox coords
387 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
388 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
389 double r_b = rg->r.computed;
391 // converted points in userspace coords
392 NR::Point c_u = c_b * point_convert;
393 NR::Point f_u = f_b * point_convert;
394 double r_u = r_b * point_convert.expansion();
396 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
397 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
398 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
399 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
400 sp_repr_set_svg_double(repr, "r", r_u);
402 } else {
403 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
405 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
406 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
408 NR::Point p1_u = p1_b * point_convert;
409 NR::Point p2_u = p2_b * point_convert;
411 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
412 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
413 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
414 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
415 }
417 // set the gradientUnits
418 repr->setAttribute("gradientUnits", "userSpaceOnUse");
419 }
421 // apply the gradient to the item (may be necessary if we forked it); not recursive
422 // generally because grouped items will be taken care of later (we're being called
423 // from sp_item_adjust_paint_recursive); however text and all its children should all
424 // refer to one gradient, hence the recursive call for text (because we can't/don't
425 // want to access tspans and set gradients on them separately)
426 if (SP_IS_TEXT(item))
427 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
428 else
429 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
431 return gr;
432 }
434 void
435 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
436 {
437 if (set) {
438 gradient->gradientTransform = postmul;
439 } else {
440 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
441 }
442 gradient->gradientTransform_set = TRUE;
444 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
445 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
446 g_free(c);
447 }
449 SPGradient *
450 sp_item_gradient (SPItem *item, bool fill_or_stroke)
451 {
452 SPStyle *style = SP_OBJECT_STYLE (item);
453 SPGradient *gradient = NULL;
455 if (fill_or_stroke) {
456 if (style && (style->fill.isPaintserver())) {
457 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
458 if (SP_IS_GRADIENT (server)) {
459 gradient = SP_GRADIENT (server);
460 }
461 }
462 } else {
463 if (style && (style->stroke.isPaintserver())) {
464 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
465 if (SP_IS_GRADIENT (server)) {
466 gradient = SP_GRADIENT (server);
467 }
468 }
469 }
471 return gradient;
472 }
475 SPStop*
476 sp_first_stop(SPGradient *gradient)
477 {
478 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
479 if (SP_IS_STOP (ochild))
480 return SP_STOP(ochild);
481 }
482 return NULL;
483 }
485 SPStop*
486 sp_prev_stop(SPStop *stop, SPGradient *gradient)
487 {
488 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
489 return NULL;
490 SPObject *found = NULL;
491 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
492 if (SP_IS_STOP (ochild)) {
493 found = ochild;
494 }
495 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
496 break;
497 }
498 }
499 return SP_STOP(found);
500 }
502 SPStop*
503 sp_next_stop(SPStop *stop)
504 {
505 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
506 if (SP_IS_STOP (ochild))
507 return SP_STOP(ochild);
508 }
509 return NULL;
510 }
512 SPStop*
513 sp_last_stop(SPGradient *gradient)
514 {
515 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
516 if (sp_next_stop (stop) == NULL)
517 return stop;
518 }
519 return NULL;
520 }
522 SPStop*
523 sp_get_stop_i(SPGradient *gradient, guint stop_i)
524 {
525 SPStop *stop = sp_first_stop (gradient);
527 for (guint i=0; i < stop_i; i++) {
528 if (!stop) return NULL;
529 stop = sp_next_stop (stop);
530 }
532 return stop;
533 }
536 void
537 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
538 {
539 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
541 if (!gradient || !SP_IS_GRADIENT(gradient))
542 return;
544 SPGradient *vector = sp_gradient_get_vector (gradient, false);
545 switch (point_type) {
546 case POINT_LG_BEGIN:
547 case POINT_RG_CENTER:
548 case POINT_RG_FOCUS:
549 {
550 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
551 gtk_widget_show (dialog);
552 }
553 break;
555 case POINT_LG_END:
556 case POINT_RG_R1:
557 case POINT_RG_R2:
558 {
559 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
560 gtk_widget_show (dialog);
561 }
562 break;
564 case POINT_LG_MID:
565 case POINT_RG_MID1:
566 case POINT_RG_MID2:
567 {
568 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
569 gtk_widget_show (dialog);
570 }
571 break;
572 default:
573 break;
574 }
575 }
577 guint32
578 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
579 {
580 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
582 if (!gradient || !SP_IS_GRADIENT(gradient))
583 return 0;
585 SPGradient *vector = sp_gradient_get_vector (gradient, false);
587 if (!vector) // orphan!
588 return 0; // what else to do?
590 switch (point_type) {
591 case POINT_LG_BEGIN:
592 case POINT_RG_CENTER:
593 case POINT_RG_FOCUS:
594 {
595 SPStop *first = sp_first_stop (vector);
596 if (first) {
597 return sp_stop_get_rgba32(first);
598 }
599 }
600 break;
602 case POINT_LG_END:
603 case POINT_RG_R1:
604 case POINT_RG_R2:
605 {
606 SPStop *last = sp_last_stop (vector);
607 if (last) {
608 return sp_stop_get_rgba32(last);
609 }
610 }
611 break;
613 case POINT_LG_MID:
614 case POINT_RG_MID1:
615 case POINT_RG_MID2:
616 {
617 SPStop *stopi = sp_get_stop_i (vector, point_i);
618 if (stopi) {
619 return sp_stop_get_rgba32(stopi);
620 }
621 }
622 break;
624 default:
625 break;
626 }
627 return 0;
628 }
630 void
631 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
632 {
633 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
635 if (!gradient || !SP_IS_GRADIENT(gradient))
636 return;
638 SPGradient *vector = sp_gradient_get_vector (gradient, false);
640 if (!vector) // orphan!
641 return;
643 vector = sp_gradient_fork_vector_if_necessary (vector);
644 if ( gradient != vector && gradient->ref->getObject() != vector ) {
645 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
646 }
648 switch (point_type) {
649 case POINT_LG_BEGIN:
650 case POINT_RG_CENTER:
651 case POINT_RG_FOCUS:
652 {
653 SPStop *first = sp_first_stop (vector);
654 if (first) {
655 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
656 }
657 }
658 break;
660 case POINT_LG_END:
661 case POINT_RG_R1:
662 case POINT_RG_R2:
663 {
664 SPStop *last = sp_last_stop (vector);
665 if (last) {
666 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
667 }
668 }
669 break;
671 case POINT_LG_MID:
672 case POINT_RG_MID1:
673 case POINT_RG_MID2:
674 {
675 SPStop *stopi = sp_get_stop_i (vector, point_i);
676 if (stopi) {
677 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
678 }
679 }
680 break;
682 default:
683 break;
684 }
685 }
687 void
688 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
689 {
690 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
691 if (!gradient || !SP_IS_GRADIENT(gradient))
692 return;
694 SPGradient *vector = sp_gradient_get_vector (gradient, false);
695 if (!vector) // orphan!
696 return;
698 vector = sp_gradient_fork_vector_if_necessary (vector);
699 if ( gradient != vector && gradient->ref->getObject() != vector ) {
700 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
701 }
703 GSList *child_reprs = NULL;
704 GSList *child_objects = NULL;
705 std::vector<double> offsets;
706 for (SPObject *child = sp_object_first_child(vector);
707 child != NULL; child = SP_OBJECT_NEXT(child)) {
708 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
709 child_objects = g_slist_prepend (child_objects, child);
710 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
711 }
713 GSList *child_copies = NULL;
714 for (GSList *i = child_reprs; i != NULL; i = i->next) {
715 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
716 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
717 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
718 }
721 for (GSList *i = child_objects; i != NULL; i = i->next) {
722 SPObject *child = SP_OBJECT (i->data);
723 child->deleteObject();
724 }
726 std::vector<double>::iterator iter = offsets.end() - 1;
727 for (GSList *i = child_copies; i != NULL; i = i->next) {
728 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
729 vector->appendChildRepr(copy);
730 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
731 iter --;
732 Inkscape::GC::release(copy);
733 }
735 g_slist_free (child_reprs);
736 g_slist_free (child_copies);
737 g_slist_free (child_objects);
738 }
741 // FIXME: make general global function
742 static double
743 get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
744 {
745 double length = NR::L2(end - begin);
746 NR::Point be = (end - begin) / length;
747 double r = NR::dot(p - begin, be);
749 if (r < 0.0) return 0.0;
750 if (r > length) return 1.0;
752 return (r / length);
753 }
756 /**
757 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
758 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
759 */
760 void
761 sp_item_gradient_set_coords (SPItem *item, guint point_type, guint point_i, NR::Point p_w, bool fill_or_stroke, bool write_repr, bool scale)
762 {
763 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
765 if (!gradient || !SP_IS_GRADIENT(gradient))
766 return;
768 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
770 NR::Matrix i2d = sp_item_i2d_affine (item);
771 NR::Point p = p_w * i2d.inverse();
772 p *= (gradient->gradientTransform).inverse();
773 // now p is in gradient's original coordinates
775 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
777 if (SP_IS_LINEARGRADIENT(gradient)) {
778 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
779 switch (point_type) {
780 case POINT_LG_BEGIN:
781 if (scale) {
782 lg->x2.computed += (lg->x1.computed - p[NR::X]);
783 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
784 }
785 lg->x1.computed = p[NR::X];
786 lg->y1.computed = p[NR::Y];
787 if (write_repr) {
788 if (scale) {
789 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
790 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
791 }
792 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
793 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
794 } else {
795 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
796 }
797 break;
798 case POINT_LG_END:
799 if (scale) {
800 lg->x1.computed += (lg->x2.computed - p[NR::X]);
801 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
802 }
803 lg->x2.computed = p[NR::X];
804 lg->y2.computed = p[NR::Y];
805 if (write_repr) {
806 if (scale) {
807 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
808 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
809 }
810 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
811 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
812 } else {
813 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
814 }
815 break;
816 case POINT_LG_MID:
817 {
818 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
819 double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
820 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
821 sp_gradient_ensure_vector(lg);
822 lg->vector.stops.at(point_i).offset = offset;
823 SPStop* stopi = sp_get_stop_i(vector, point_i);
824 stopi->offset = offset;
825 if (write_repr) {
826 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
827 } else {
828 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
829 }
830 }
831 break;
832 default:
833 break;
834 }
835 } else if (SP_IS_RADIALGRADIENT(gradient)) {
836 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
837 NR::Point c (rg->cx.computed, rg->cy.computed);
838 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
839 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
840 // prevent setting a radius too close to the center
841 return;
842 }
843 NR::Matrix new_transform;
844 bool transform_set = false;
846 switch (point_type) {
847 case POINT_RG_CENTER:
848 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
849 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
850 rg->cx.computed = p[NR::X];
851 rg->cy.computed = p[NR::Y];
852 if (write_repr) {
853 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
854 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
855 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
856 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
857 } else {
858 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
859 }
860 break;
861 case POINT_RG_FOCUS:
862 rg->fx.computed = p[NR::X];
863 rg->fy.computed = p[NR::Y];
864 if (write_repr) {
865 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
866 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
867 } else {
868 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
869 }
870 break;
871 case POINT_RG_R1:
872 {
873 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
874 double r1_angle = NR::atan2(r1_w - c_w);
875 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
876 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
878 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
879 NR::Matrix (NR::rotate(-r1_angle)) *
880 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
881 NR::Matrix (NR::rotate(r1_angle)) *
882 NR::Matrix (NR::rotate(move_angle)) *
883 NR::Matrix (NR::translate (c_w));
885 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
886 transform_set = true;
888 break;
889 }
890 case POINT_RG_R2:
891 {
892 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
893 double r2_angle = NR::atan2(r2_w - c_w);
894 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
895 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
897 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
898 NR::Matrix (NR::rotate(-r2_angle)) *
899 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
900 NR::Matrix (NR::rotate(r2_angle)) *
901 NR::Matrix (NR::rotate(move_angle)) *
902 NR::Matrix (NR::translate (c_w));
904 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
905 transform_set = true;
907 break;
908 }
909 case POINT_RG_MID1:
910 {
911 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
912 NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
913 double offset = get_offset_between_points (p, start, end);
914 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
915 sp_gradient_ensure_vector(rg);
916 rg->vector.stops.at(point_i).offset = offset;
917 SPStop* stopi = sp_get_stop_i(vector, point_i);
918 stopi->offset = offset;
919 if (write_repr) {
920 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
921 } else {
922 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
923 }
924 break;
925 }
926 case POINT_RG_MID2:
927 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
928 NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
929 double offset = get_offset_between_points (p, start, end);
930 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
931 sp_gradient_ensure_vector(rg);
932 rg->vector.stops.at(point_i).offset = offset;
933 SPStop* stopi = sp_get_stop_i(vector, point_i);
934 stopi->offset = offset;
935 if (write_repr) {
936 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
937 } else {
938 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
939 }
940 break;
941 }
942 if (transform_set) {
943 gradient->gradientTransform = new_transform;
944 gradient->gradientTransform_set = TRUE;
945 if (write_repr) {
946 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
947 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
948 g_free(s);
949 } else {
950 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
951 }
952 }
953 }
954 }
956 SPGradient *
957 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
958 {
959 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
961 if (gradient)
962 return sp_gradient_get_vector (gradient, false);
963 return NULL;
964 }
966 SPGradientSpread
967 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
968 {
969 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
971 if (gradient)
972 return sp_gradient_get_spread (gradient);
973 return SP_GRADIENT_SPREAD_PAD;
974 }
977 /**
978 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
979 in desktop coordinates.
980 */
982 NR::Point
983 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
984 {
985 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
987 NR::Point p (0, 0);
989 if (!gradient)
990 return p;
992 if (SP_IS_LINEARGRADIENT(gradient)) {
993 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
994 switch (point_type) {
995 case POINT_LG_BEGIN:
996 p = NR::Point (lg->x1.computed, lg->y1.computed);
997 break;
998 case POINT_LG_END:
999 p = NR::Point (lg->x2.computed, lg->y2.computed);
1000 break;
1001 case POINT_LG_MID:
1002 {
1003 gdouble offset = lg->vector.stops.at(point_i).offset;
1004 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
1005 }
1006 break;
1007 }
1008 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1009 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1010 switch (point_type) {
1011 case POINT_RG_CENTER:
1012 p = NR::Point (rg->cx.computed, rg->cy.computed);
1013 break;
1014 case POINT_RG_FOCUS:
1015 p = NR::Point (rg->fx.computed, rg->fy.computed);
1016 break;
1017 case POINT_RG_R1:
1018 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1019 break;
1020 case POINT_RG_R2:
1021 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1022 break;
1023 case POINT_RG_MID1:
1024 {
1025 gdouble offset = rg->vector.stops.at(point_i).offset;
1026 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1027 }
1028 break;
1029 case POINT_RG_MID2:
1030 {
1031 gdouble offset = rg->vector.stops.at(point_i).offset;
1032 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1033 }
1034 break;
1035 }
1036 }
1038 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1039 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1040 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
1041 if (bbox) {
1042 p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
1043 0, bbox->dimensions()[NR::Y],
1044 bbox->min()[NR::X], bbox->min()[NR::Y]);
1045 }
1046 }
1047 p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
1048 return p;
1049 }
1052 /**
1053 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1054 * new private gradient, if needed.
1055 * gr has to be a normalized vector.
1056 */
1058 SPGradient *
1059 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1060 {
1061 g_return_val_if_fail(item != NULL, NULL);
1062 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1063 g_return_val_if_fail(gr != NULL, NULL);
1064 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1065 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1067 SPStyle *style = SP_OBJECT_STYLE(item);
1068 g_assert(style != NULL);
1070 SPPaintServer *ps = NULL;
1071 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1072 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1074 if (ps
1075 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1076 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1077 {
1079 /* Current fill style is the gradient of the required type */
1080 SPGradient *current = SP_GRADIENT(ps);
1082 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1084 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1085 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1087 // current is private and it's either used once, or all its uses are by children of item;
1088 // so just change its href to vector
1090 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1091 /* href is not the vector */
1092 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1093 }
1094 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1095 return current;
1097 } else {
1099 // the gradient is not private, or it is shared with someone else;
1100 // normalize it (this includes creating new private if necessary)
1101 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1103 g_return_val_if_fail(normalized != NULL, NULL);
1105 if (normalized != current) {
1107 /* We have to change object style here; recursive because this is used from
1108 * fill&stroke and must work for groups etc. */
1109 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1110 }
1111 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1112 return normalized;
1113 }
1115 } else {
1116 /* Current fill style is not a gradient or wrong type, so construct everything */
1117 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1118 constructed = sp_gradient_reset_to_userspace(constructed, item);
1119 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1120 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1121 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1122 return constructed;
1123 }
1124 }
1126 static void
1127 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1128 {
1129 g_return_if_fail(repr != NULL);
1130 g_return_if_fail(link != NULL);
1131 g_return_if_fail(SP_IS_GRADIENT(link));
1133 gchar *ref;
1134 if (link) {
1135 gchar const *id = SP_OBJECT_ID(link);
1136 size_t const len = strlen(id);
1137 ref = (gchar*) alloca(len + 2);
1138 *ref = '#';
1139 memcpy(ref + 1, id, len + 1);
1140 } else {
1141 ref = NULL;
1142 }
1144 repr->setAttribute("xlink:href", ref);
1145 }
1147 /*
1148 * Get default normalized gradient vector of document, create if there is none
1149 */
1151 SPGradient *
1152 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1153 {
1154 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1155 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1157 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1159 repr->setAttribute("inkscape:collect", "always");
1160 // set here, but removed when it's edited in the gradient editor
1161 // to further reduce clutter, we could
1162 // (1) here, search gradients by color and return what is found without duplication
1163 // (2) in fill & stroke, show only one copy of each gradient in list
1165 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1167 gchar b[64];
1168 sp_svg_write_color(b, sizeof(b), color);
1170 {
1171 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1172 stop->setAttribute("style", t);
1173 g_free(t);
1174 }
1176 stop->setAttribute("offset", "0");
1178 repr->appendChild(stop);
1179 Inkscape::GC::release(stop);
1181 stop = xml_doc->createElement("svg:stop");
1183 {
1184 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1185 stop->setAttribute("style", t);
1186 g_free(t);
1187 }
1189 stop->setAttribute("offset", "1");
1191 repr->appendChild(stop);
1192 Inkscape::GC::release(stop);
1194 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1195 Inkscape::GC::release(repr);
1197 /* fixme: This does not look like nice */
1198 SPGradient *gr;
1199 gr = (SPGradient *) document->getObjectByRepr(repr);
1200 g_assert(gr != NULL);
1201 g_assert(SP_IS_GRADIENT(gr));
1202 /* fixme: Maybe add extra sanity check here */
1203 gr->state = SP_GRADIENT_STATE_VECTOR;
1205 return gr;
1206 }
1208 /**
1209 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1210 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1211 */
1212 SPGradient *
1213 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1214 SPObject *const o, bool const is_fill)
1215 {
1216 guint32 rgba = 0;
1217 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1218 rgba = sp_desktop_get_color(desktop, is_fill);
1219 } else {
1220 // take the color of the object
1221 SPStyle const &style = *SP_OBJECT_STYLE(o);
1222 SPIPaint const &paint = ( is_fill
1223 ? style.fill
1224 : style.stroke );
1225 if (paint.isPaintserver()) {
1226 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1227 if (SP_IS_GRADIENT (server)) {
1228 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1229 } else {
1230 rgba = sp_desktop_get_color(desktop, is_fill);
1231 }
1232 } else if (paint.isColor()) {
1233 rgba = paint.value.color.toRGBA32( 0xff );
1234 } else {
1235 // if o doesn't use flat color, then take current color of the desktop.
1236 rgba = sp_desktop_get_color(desktop, is_fill);
1237 }
1238 }
1240 return sp_document_default_gradient_vector(doc, rgba);
1241 }
1244 /*
1245 Local Variables:
1246 mode:c++
1247 c-file-style:"stroustrup"
1248 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1249 indent-tabs-mode:nil
1250 fill-column:99
1251 End:
1252 */
1253 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :