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.type == SP_PAINT_TYPE_PAINTSERVER
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.type == SP_PAINT_TYPE_PAINTSERVER
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 g_assert( bbox && !bbox->isEmpty() );
280 NR::Coord const width = bbox->dimensions()[NR::X];
281 NR::Coord const height = bbox->dimensions()[NR::Y];
283 NR::Point const center = bbox->midpoint();
285 if (SP_IS_RADIALGRADIENT(gr)) {
286 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
287 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
288 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
289 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
290 sp_repr_set_svg_double(repr, "r", width/2);
292 // we want it to be elliptic, not circular
293 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
294 NR::Matrix (NR::scale(1, height/width)) *
295 NR::Matrix (NR::translate (center));
297 gr->gradientTransform = squeeze;
298 {
299 gchar *c=sp_svg_transform_write(gr->gradientTransform);
300 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
301 g_free(c);
302 }
303 } else {
304 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
305 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
306 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
307 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
308 }
310 // set the gradientUnits
311 repr->setAttribute("gradientUnits", "userSpaceOnUse");
313 return gr;
314 }
316 /**
317 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
318 * @return The new gradient.
319 */
320 SPGradient *
321 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
322 {
323 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
325 // First, fork it if it is shared
326 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
327 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
329 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
331 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
333 // calculate the bbox of the item
334 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
335 NR::Matrix bbox2user;
336 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
337 if ( bbox && !bbox->isEmpty() ) {
338 bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
339 0, bbox->dimensions()[NR::Y],
340 bbox->min()[NR::X], bbox->min()[NR::Y]);
341 } else {
342 // would be degenerate otherwise
343 bbox2user = NR::identity();
344 }
346 /* skew is the additional transform, defined by the proportions of the item, that we need
347 * to apply to the gradient in order to work around this weird bit from SVG 1.1
348 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
349 *
350 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
351 * matrix, the stripes of the linear gradient are perpendicular to the gradient
352 * vector in object bounding box space (i.e., the abstract coordinate system where
353 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
354 * bottom/right of the object bounding box). When the object's bounding box is not
355 * square, the stripes that are conceptually perpendicular to the gradient vector
356 * within object bounding box space will render non-perpendicular relative to the
357 * gradient vector in user space due to application of the non-uniform scaling
358 * transformation from bounding box space to user space.
359 */
360 NR::Matrix skew = bbox2user;
361 double exp = skew.expansion();
362 skew[0] /= exp;
363 skew[1] /= exp;
364 skew[2] /= exp;
365 skew[3] /= exp;
366 skew[4] = 0;
367 skew[5] = 0;
369 // apply skew to the gradient
370 gr->gradientTransform = skew;
371 {
372 gchar *c=sp_svg_transform_write(gr->gradientTransform);
373 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
374 g_free(c);
375 }
377 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
378 // as to cancel it out when it's applied to the gradient during rendering
379 NR::Matrix point_convert = bbox2user * skew.inverse();
381 if (SP_IS_RADIALGRADIENT(gr)) {
382 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
384 // original points in the bbox coords
385 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
386 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
387 double r_b = rg->r.computed;
389 // converted points in userspace coords
390 NR::Point c_u = c_b * point_convert;
391 NR::Point f_u = f_b * point_convert;
392 double r_u = r_b * point_convert.expansion();
394 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
395 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
396 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
397 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
398 sp_repr_set_svg_double(repr, "r", r_u);
400 } else {
401 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
403 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
404 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
406 NR::Point p1_u = p1_b * point_convert;
407 NR::Point p2_u = p2_b * point_convert;
409 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
410 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
411 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
412 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
413 }
415 // set the gradientUnits
416 repr->setAttribute("gradientUnits", "userSpaceOnUse");
417 }
419 // apply the gradient to the item (may be necessary if we forked it); not recursive
420 // generally because grouped items will be taken care of later (we're being called
421 // from sp_item_adjust_paint_recursive); however text and all its children should all
422 // refer to one gradient, hence the recursive call for text (because we can't/don't
423 // want to access tspans and set gradients on them separately)
424 if (SP_IS_TEXT(item))
425 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
426 else
427 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
429 return gr;
430 }
432 void
433 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
434 {
435 if (set) {
436 gradient->gradientTransform = postmul;
437 } else {
438 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
439 }
440 gradient->gradientTransform_set = TRUE;
442 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
443 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
444 g_free(c);
445 }
447 SPGradient *
448 sp_item_gradient (SPItem *item, bool fill_or_stroke)
449 {
450 SPStyle *style = SP_OBJECT_STYLE (item);
451 SPGradient *gradient = NULL;
453 if (fill_or_stroke) {
454 if (style && (style->fill.type == SP_PAINT_TYPE_PAINTSERVER)) {
455 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
456 if (SP_IS_GRADIENT (server)) {
457 gradient = SP_GRADIENT (server);
458 }
459 }
460 } else {
461 if (style && (style->stroke.type == SP_PAINT_TYPE_PAINTSERVER)) {
462 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
463 if (SP_IS_GRADIENT (server)) {
464 gradient = SP_GRADIENT (server);
465 }
466 }
467 }
469 return gradient;
470 }
473 SPStop*
474 sp_first_stop(SPGradient *gradient)
475 {
476 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
477 if (SP_IS_STOP (ochild))
478 return SP_STOP(ochild);
479 }
480 return NULL;
481 }
483 SPStop*
484 sp_prev_stop(SPStop *stop, SPGradient *gradient)
485 {
486 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
487 return NULL;
488 SPObject *found = NULL;
489 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
490 if (SP_IS_STOP (ochild)) {
491 found = ochild;
492 }
493 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
494 break;
495 }
496 }
497 return SP_STOP(found);
498 }
500 SPStop*
501 sp_next_stop(SPStop *stop)
502 {
503 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
504 if (SP_IS_STOP (ochild))
505 return SP_STOP(ochild);
506 }
507 return NULL;
508 }
510 SPStop*
511 sp_last_stop(SPGradient *gradient)
512 {
513 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
514 if (sp_next_stop (stop) == NULL)
515 return stop;
516 }
517 return NULL;
518 }
520 SPStop*
521 sp_get_stop_i(SPGradient *gradient, guint stop_i)
522 {
523 SPStop *stop = sp_first_stop (gradient);
525 for (guint i=0; i < stop_i; i++) {
526 if (!stop) return NULL;
527 stop = sp_next_stop (stop);
528 }
530 return stop;
531 }
534 void
535 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
536 {
537 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
539 if (!gradient || !SP_IS_GRADIENT(gradient))
540 return;
542 SPGradient *vector = sp_gradient_get_vector (gradient, false);
543 switch (point_type) {
544 case POINT_LG_BEGIN:
545 case POINT_RG_CENTER:
546 case POINT_RG_FOCUS:
547 {
548 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
549 gtk_widget_show (dialog);
550 }
551 break;
553 case POINT_LG_END:
554 case POINT_RG_R1:
555 case POINT_RG_R2:
556 {
557 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
558 gtk_widget_show (dialog);
559 }
560 break;
562 case POINT_LG_MID:
563 case POINT_RG_MID1:
564 case POINT_RG_MID2:
565 {
566 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
567 gtk_widget_show (dialog);
568 }
569 break;
570 default:
571 break;
572 }
573 }
575 guint32
576 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
577 {
578 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
580 if (!gradient || !SP_IS_GRADIENT(gradient))
581 return 0;
583 SPGradient *vector = sp_gradient_get_vector (gradient, false);
585 if (!vector) // orphan!
586 return 0; // what else to do?
588 switch (point_type) {
589 case POINT_LG_BEGIN:
590 case POINT_RG_CENTER:
591 case POINT_RG_FOCUS:
592 {
593 SPStop *first = sp_first_stop (vector);
594 if (first) {
595 return sp_stop_get_rgba32(first);
596 }
597 }
598 break;
600 case POINT_LG_END:
601 case POINT_RG_R1:
602 case POINT_RG_R2:
603 {
604 SPStop *last = sp_last_stop (vector);
605 if (last) {
606 return sp_stop_get_rgba32(last);
607 }
608 }
609 break;
611 case POINT_LG_MID:
612 case POINT_RG_MID1:
613 case POINT_RG_MID2:
614 {
615 SPStop *stopi = sp_get_stop_i (vector, point_i);
616 if (stopi) {
617 return sp_stop_get_rgba32(stopi);
618 }
619 }
620 break;
622 default:
623 break;
624 }
625 return 0;
626 }
628 void
629 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
630 {
631 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
633 if (!gradient || !SP_IS_GRADIENT(gradient))
634 return;
636 SPGradient *vector = sp_gradient_get_vector (gradient, false);
638 if (!vector) // orphan!
639 return;
641 vector = sp_gradient_fork_vector_if_necessary (vector);
642 if ( gradient != vector && gradient->ref->getObject() != vector ) {
643 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
644 }
646 switch (point_type) {
647 case POINT_LG_BEGIN:
648 case POINT_RG_CENTER:
649 case POINT_RG_FOCUS:
650 {
651 SPStop *first = sp_first_stop (vector);
652 if (first) {
653 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
654 }
655 }
656 break;
658 case POINT_LG_END:
659 case POINT_RG_R1:
660 case POINT_RG_R2:
661 {
662 SPStop *last = sp_last_stop (vector);
663 if (last) {
664 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
665 }
666 }
667 break;
669 case POINT_LG_MID:
670 case POINT_RG_MID1:
671 case POINT_RG_MID2:
672 {
673 SPStop *stopi = sp_get_stop_i (vector, point_i);
674 if (stopi) {
675 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
676 }
677 }
678 break;
680 default:
681 break;
682 }
683 }
685 void
686 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
687 {
688 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
689 if (!gradient || !SP_IS_GRADIENT(gradient))
690 return;
692 SPGradient *vector = sp_gradient_get_vector (gradient, false);
693 if (!vector) // orphan!
694 return;
696 vector = sp_gradient_fork_vector_if_necessary (vector);
697 if ( gradient != vector && gradient->ref->getObject() != vector ) {
698 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
699 }
701 GSList *child_reprs = NULL;
702 GSList *child_objects = NULL;
703 std::vector<double> offsets;
704 for (SPObject *child = sp_object_first_child(vector);
705 child != NULL; child = SP_OBJECT_NEXT(child)) {
706 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
707 child_objects = g_slist_prepend (child_objects, child);
708 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
709 }
711 GSList *child_copies = NULL;
712 for (GSList *i = child_reprs; i != NULL; i = i->next) {
713 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
714 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
715 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
716 }
719 for (GSList *i = child_objects; i != NULL; i = i->next) {
720 SPObject *child = SP_OBJECT (i->data);
721 child->deleteObject();
722 }
724 std::vector<double>::iterator iter = offsets.end() - 1;
725 for (GSList *i = child_copies; i != NULL; i = i->next) {
726 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
727 vector->appendChildRepr(copy);
728 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
729 iter --;
730 Inkscape::GC::release(copy);
731 }
733 g_slist_free (child_reprs);
734 g_slist_free (child_copies);
735 g_slist_free (child_objects);
736 }
739 // FIXME: make general global function
740 static double
741 get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
742 {
743 double length = NR::L2(end - begin);
744 NR::Point be = (end - begin) / length;
745 double r = NR::dot(p - begin, be);
747 if (r < 0.0) return 0.0;
748 if (r > length) return 1.0;
750 return (r / length);
751 }
754 /**
755 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
756 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
757 */
758 void
759 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)
760 {
761 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
763 if (!gradient || !SP_IS_GRADIENT(gradient))
764 return;
766 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
768 NR::Matrix i2d = sp_item_i2d_affine (item);
769 NR::Point p = p_w * i2d.inverse();
770 p *= (gradient->gradientTransform).inverse();
771 // now p is in gradient's original coordinates
773 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
775 if (SP_IS_LINEARGRADIENT(gradient)) {
776 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
777 switch (point_type) {
778 case POINT_LG_BEGIN:
779 if (scale) {
780 lg->x2.computed += (lg->x1.computed - p[NR::X]);
781 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
782 }
783 lg->x1.computed = p[NR::X];
784 lg->y1.computed = p[NR::Y];
785 if (write_repr) {
786 if (scale) {
787 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
788 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
789 }
790 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
791 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
792 } else {
793 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
794 }
795 break;
796 case POINT_LG_END:
797 if (scale) {
798 lg->x1.computed += (lg->x2.computed - p[NR::X]);
799 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
800 }
801 lg->x2.computed = p[NR::X];
802 lg->y2.computed = p[NR::Y];
803 if (write_repr) {
804 if (scale) {
805 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
806 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
807 }
808 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
809 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
810 } else {
811 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
812 }
813 break;
814 case POINT_LG_MID:
815 {
816 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
817 double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
818 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
819 sp_gradient_ensure_vector(lg);
820 lg->vector.stops.at(point_i).offset = offset;
821 SPStop* stopi = sp_get_stop_i(vector, point_i);
822 stopi->offset = offset;
823 if (write_repr) {
824 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
825 } else {
826 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
827 }
828 }
829 break;
830 default:
831 break;
832 }
833 } else if (SP_IS_RADIALGRADIENT(gradient)) {
834 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
835 NR::Point c (rg->cx.computed, rg->cy.computed);
836 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
837 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
838 // prevent setting a radius too close to the center
839 return;
840 }
841 NR::Matrix new_transform;
842 bool transform_set = false;
844 switch (point_type) {
845 case POINT_RG_CENTER:
846 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
847 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
848 rg->cx.computed = p[NR::X];
849 rg->cy.computed = p[NR::Y];
850 if (write_repr) {
851 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
852 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
853 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
854 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
855 } else {
856 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
857 }
858 break;
859 case POINT_RG_FOCUS:
860 rg->fx.computed = p[NR::X];
861 rg->fy.computed = p[NR::Y];
862 if (write_repr) {
863 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
864 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
865 } else {
866 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
867 }
868 break;
869 case POINT_RG_R1:
870 {
871 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
872 double r1_angle = NR::atan2(r1_w - c_w);
873 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
874 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
876 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
877 NR::Matrix (NR::rotate(-r1_angle)) *
878 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
879 NR::Matrix (NR::rotate(r1_angle)) *
880 NR::Matrix (NR::rotate(move_angle)) *
881 NR::Matrix (NR::translate (c_w));
883 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
884 transform_set = true;
886 break;
887 }
888 case POINT_RG_R2:
889 {
890 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
891 double r2_angle = NR::atan2(r2_w - c_w);
892 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
893 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
895 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
896 NR::Matrix (NR::rotate(-r2_angle)) *
897 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
898 NR::Matrix (NR::rotate(r2_angle)) *
899 NR::Matrix (NR::rotate(move_angle)) *
900 NR::Matrix (NR::translate (c_w));
902 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
903 transform_set = true;
905 break;
906 }
907 case POINT_RG_MID1:
908 {
909 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
910 NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
911 double offset = get_offset_between_points (p, start, end);
912 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
913 sp_gradient_ensure_vector(rg);
914 rg->vector.stops.at(point_i).offset = offset; //crash
915 SPStop* stopi = sp_get_stop_i(vector, point_i);
916 stopi->offset = offset;
917 if (write_repr) {
918 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
919 } else {
920 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
921 }
922 break;
923 }
924 case POINT_RG_MID2:
925 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
926 NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
927 double offset = get_offset_between_points (p, start, end);
928 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
929 sp_gradient_ensure_vector(rg);
930 rg->vector.stops.at(point_i).offset = offset;
931 SPStop* stopi = sp_get_stop_i(vector, point_i);
932 stopi->offset = offset;
933 if (write_repr) {
934 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
935 } else {
936 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
937 }
938 break;
939 }
940 if (transform_set) {
941 gradient->gradientTransform = new_transform;
942 gradient->gradientTransform_set = TRUE;
943 if (write_repr) {
944 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
945 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
946 g_free(s);
947 } else {
948 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
949 }
950 }
951 }
952 }
954 SPGradient *
955 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
956 {
957 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
959 if (gradient)
960 return sp_gradient_get_vector (gradient, false);
961 return NULL;
962 }
964 SPGradientSpread
965 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
966 {
967 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
969 if (gradient)
970 return sp_gradient_get_spread (gradient);
971 return SP_GRADIENT_SPREAD_PAD;
972 }
975 /**
976 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
977 in desktop coordinates.
978 */
980 NR::Point
981 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
982 {
983 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
985 NR::Point p (0, 0);
987 if (!gradient)
988 return p;
990 if (SP_IS_LINEARGRADIENT(gradient)) {
991 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
992 switch (point_type) {
993 case POINT_LG_BEGIN:
994 p = NR::Point (lg->x1.computed, lg->y1.computed);
995 break;
996 case POINT_LG_END:
997 p = NR::Point (lg->x2.computed, lg->y2.computed);
998 break;
999 case POINT_LG_MID:
1000 {
1001 gdouble offset = lg->vector.stops.at(point_i).offset;
1002 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
1003 }
1004 break;
1005 }
1006 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1007 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1008 switch (point_type) {
1009 case POINT_RG_CENTER:
1010 p = NR::Point (rg->cx.computed, rg->cy.computed);
1011 break;
1012 case POINT_RG_FOCUS:
1013 p = NR::Point (rg->fx.computed, rg->fy.computed);
1014 break;
1015 case POINT_RG_R1:
1016 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1017 break;
1018 case POINT_RG_R2:
1019 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1020 break;
1021 case POINT_RG_MID1:
1022 {
1023 gdouble offset = rg->vector.stops.at(point_i).offset;
1024 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1025 }
1026 break;
1027 case POINT_RG_MID2:
1028 {
1029 gdouble offset = rg->vector.stops.at(point_i).offset;
1030 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1031 }
1032 break;
1033 }
1034 }
1036 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1037 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1038 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
1039 if (bbox) {
1040 p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
1041 0, bbox->dimensions()[NR::Y],
1042 bbox->min()[NR::X], bbox->min()[NR::Y]);
1043 }
1044 }
1045 p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
1046 return p;
1047 }
1050 /**
1051 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1052 * new private gradient, if needed.
1053 * gr has to be a normalized vector.
1054 */
1056 SPGradient *
1057 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1058 {
1059 g_return_val_if_fail(item != NULL, NULL);
1060 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1061 g_return_val_if_fail(gr != NULL, NULL);
1062 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1063 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1065 SPStyle *style = SP_OBJECT_STYLE(item);
1066 g_assert(style != NULL);
1068 guint style_type = is_fill? style->fill.type : style->stroke.type;
1069 SPPaintServer *ps = NULL;
1070 if (style_type == SP_PAINT_TYPE_PAINTSERVER)
1071 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1073 if (ps
1074 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1075 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1076 {
1078 /* Current fill style is the gradient of the required type */
1079 SPGradient *current = SP_GRADIENT(ps);
1081 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1083 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1084 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1086 // current is private and it's either used once, or all its uses are by children of item;
1087 // so just change its href to vector
1089 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1090 /* href is not the vector */
1091 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1092 }
1093 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1094 return current;
1096 } else {
1098 // the gradient is not private, or it is shared with someone else;
1099 // normalize it (this includes creating new private if necessary)
1100 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1102 g_return_val_if_fail(normalized != NULL, NULL);
1104 if (normalized != current) {
1106 /* We have to change object style here; recursive because this is used from
1107 * fill&stroke and must work for groups etc. */
1108 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1109 }
1110 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1111 return normalized;
1112 }
1114 } else {
1115 /* Current fill style is not a gradient or wrong type, so construct everything */
1116 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1117 constructed = sp_gradient_reset_to_userspace(constructed, item);
1118 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1119 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1120 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1121 return constructed;
1122 }
1123 }
1125 static void
1126 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1127 {
1128 g_return_if_fail(repr != NULL);
1129 g_return_if_fail(link != NULL);
1130 g_return_if_fail(SP_IS_GRADIENT(link));
1132 gchar *ref;
1133 if (link) {
1134 gchar const *id = SP_OBJECT_ID(link);
1135 size_t const len = strlen(id);
1136 ref = (gchar*) alloca(len + 2);
1137 *ref = '#';
1138 memcpy(ref + 1, id, len + 1);
1139 } else {
1140 ref = NULL;
1141 }
1143 repr->setAttribute("xlink:href", ref);
1144 }
1146 /*
1147 * Get default normalized gradient vector of document, create if there is none
1148 */
1150 SPGradient *
1151 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1152 {
1153 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1154 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1156 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1158 repr->setAttribute("inkscape:collect", "always");
1159 // set here, but removed when it's edited in the gradient editor
1160 // to further reduce clutter, we could
1161 // (1) here, search gradients by color and return what is found without duplication
1162 // (2) in fill & stroke, show only one copy of each gradient in list
1164 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1166 gchar b[64];
1167 sp_svg_write_color(b, 64, color);
1169 {
1170 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1171 stop->setAttribute("style", t);
1172 g_free(t);
1173 }
1175 stop->setAttribute("offset", "0");
1177 repr->appendChild(stop);
1178 Inkscape::GC::release(stop);
1180 stop = xml_doc->createElement("svg:stop");
1182 {
1183 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1184 stop->setAttribute("style", t);
1185 g_free(t);
1186 }
1188 stop->setAttribute("offset", "1");
1190 repr->appendChild(stop);
1191 Inkscape::GC::release(stop);
1193 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1194 Inkscape::GC::release(repr);
1196 /* fixme: This does not look like nice */
1197 SPGradient *gr;
1198 gr = (SPGradient *) document->getObjectByRepr(repr);
1199 g_assert(gr != NULL);
1200 g_assert(SP_IS_GRADIENT(gr));
1201 /* fixme: Maybe add extra sanity check here */
1202 gr->state = SP_GRADIENT_STATE_VECTOR;
1204 return gr;
1205 }
1207 /**
1208 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1209 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1210 */
1211 SPGradient *
1212 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1213 SPObject *const o, bool const is_fill)
1214 {
1215 guint32 rgba = 0;
1216 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1217 rgba = sp_desktop_get_color(desktop, is_fill);
1218 } else {
1219 // take the color of the object
1220 SPStyle const &style = *SP_OBJECT_STYLE(o);
1221 SPIPaint const &paint = ( is_fill
1222 ? style.fill
1223 : style.stroke );
1224 if (paint.type == SP_PAINT_TYPE_COLOR) {
1225 rgba = sp_color_get_rgba32_ualpha(&paint.value.color, 0xff);
1226 } else if (paint.type == SP_PAINT_TYPE_PAINTSERVER) {
1227 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1228 if (SP_IS_GRADIENT (server)) {
1229 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1230 } else {
1231 rgba = sp_desktop_get_color(desktop, is_fill);
1232 }
1233 } else {
1234 // if o doesn't use flat color, then take current color of the desktop.
1235 rgba = sp_desktop_get_color(desktop, is_fill);
1236 }
1237 }
1239 return sp_document_default_gradient_vector(doc, rgba);
1240 }
1243 /*
1244 Local Variables:
1245 mode:c++
1246 c-file-style:"stroustrup"
1247 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1248 indent-tabs-mode:nil
1249 fill-column:99
1250 End:
1251 */
1252 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :