b9ff1287b9bdbc4bc08497b413ec180fdf56f206
1 #define __SP_FILTER_CHEMISTRY_C__
3 /*
4 * Various utility methods for filters
5 *
6 * Authors:
7 * Hugo Rodrigues
8 * bulia byak
9 * Niko Kiirala
10 *
11 * Copyright (C) 2006,2007 authors
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
17 #include "style.h"
18 #include "document-private.h"
19 #include "desktop-style.h"
21 #include "filter-chemistry.h"
22 #include "filter-enums.h"
24 #include "sp-feblend.h"
25 #include "sp-filter.h"
26 #include "sp-filter-reference.h"
27 #include "sp-gaussian-blur.h"
28 #include "svg/css-ostringstream.h"
30 #include "xml/repr.h"
32 /**
33 * Count how many times the filter is used by the styles of o and its
34 * descendants
35 */
36 static guint
37 count_filter_hrefs(SPObject *o, SPFilter *filter)
38 {
39 if (!o)
40 return 1;
42 guint i = 0;
44 SPStyle *style = SP_OBJECT_STYLE(o);
45 if (style
46 && style->filter.set
47 && style->getFilter() == filter)
48 {
49 i ++;
50 }
52 for (SPObject *child = sp_object_first_child(o);
53 child != NULL; child = SP_OBJECT_NEXT(child)) {
54 i += count_filter_hrefs(child, filter);
55 }
57 return i;
58 }
60 /**
61 * Sets a suitable filter effects area according to given blur radius,
62 * expansion and object size.
63 */
64 static void set_filter_area(Inkscape::XML::Node *repr, gdouble radius,
65 double expansion, double expansionX,
66 double expansionY, double width, double height)
67 {
68 // TODO: make this more generic, now assumed, that only the blur
69 // being added can affect the required filter area
71 double rx = radius * (expansionY != 0 ? (expansion / expansionY) : 1);
72 double ry = radius * (expansionX != 0 ? (expansion / expansionX) : 1);
74 if (width != 0 && height != 0 && (2.4 * rx > width * 0.1 || 2.4 * ry > height * 0.1)) {
75 // If not within the default 10% margin (see
76 // http://www.w3.org/TR/SVG11/filters.html#FilterEffectsRegion), specify margins
77 // The 2.4 is an empirical coefficient: at that distance the cutoff is practically invisible
78 // (the opacity at 2.4*radius is about 3e-3)
79 double xmargin = 2.4 * (rx) / width;
80 double ymargin = 2.4 * (ry) / height;
82 // TODO: set it in UserSpaceOnUse instead?
83 sp_repr_set_svg_double(repr, "x", -xmargin);
84 sp_repr_set_svg_double(repr, "width", 1 + 2 * xmargin);
85 sp_repr_set_svg_double(repr, "y", -ymargin);
86 sp_repr_set_svg_double(repr, "height", 1 + 2 * ymargin);
87 }
88 }
90 SPFilter *new_filter(SPDocument *document)
91 {
92 g_return_val_if_fail(document != NULL, NULL);
94 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
96 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
98 // create a new filter
99 Inkscape::XML::Node *repr;
100 repr = xml_doc->createElement("svg:filter");
102 // Append the new filter node to defs
103 SP_OBJECT_REPR(defs)->appendChild(repr);
104 Inkscape::GC::release(repr);
106 // get corresponding object
107 SPFilter *f = SP_FILTER( document->getObjectByRepr(repr) );
110 g_assert(f != NULL);
111 g_assert(SP_IS_FILTER(f));
113 return f;
114 }
116 SPFilterPrimitive *
117 filter_add_primitive(SPFilter *filter, const NR::FilterPrimitiveType type)
118 {
119 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(filter->document);
121 //create filter primitive node
122 Inkscape::XML::Node *repr;
123 repr = xml_doc->createElement(FPConverter.get_key(type).c_str());
125 // set default values
126 switch(type) {
127 case NR::NR_FILTER_BLEND:
128 repr->setAttribute("blend", "normal");
129 break;
130 case NR::NR_FILTER_COLORMATRIX:
131 break;
132 case NR::NR_FILTER_COMPONENTTRANSFER:
133 break;
134 case NR::NR_FILTER_COMPOSITE:
135 break;
136 case NR::NR_FILTER_CONVOLVEMATRIX:
137 repr->setAttribute("order", "3 3");
138 repr->setAttribute("kernelMatrix", "0 0 0 0 0 0 0 0 0");
139 break;
140 case NR::NR_FILTER_DIFFUSELIGHTING:
141 break;
142 case NR::NR_FILTER_DISPLACEMENTMAP:
143 break;
144 case NR::NR_FILTER_FLOOD:
145 break;
146 case NR::NR_FILTER_GAUSSIANBLUR:
147 repr->setAttribute("stdDeviation", "1");
148 break;
149 case NR::NR_FILTER_IMAGE:
150 break;
151 case NR::NR_FILTER_MERGE:
152 break;
153 case NR::NR_FILTER_MORPHOLOGY:
154 break;
155 case NR::NR_FILTER_OFFSET:
156 repr->setAttribute("dx", "0");
157 repr->setAttribute("dy", "0");
158 break;
159 case NR::NR_FILTER_SPECULARLIGHTING:
160 break;
161 case NR::NR_FILTER_TILE:
162 break;
163 case NR::NR_FILTER_TURBULENCE:
164 break;
165 default:
166 break;
167 }
169 //set primitive as child of filter node
170 filter->repr->appendChild(repr);
171 Inkscape::GC::release(repr);
173 // get corresponding object
174 SPFilterPrimitive *prim = SP_FILTER_PRIMITIVE( filter->document->getObjectByRepr(repr) );
176 g_assert(prim != NULL);
177 g_assert(SP_IS_FILTER_PRIMITIVE(prim));
179 return prim;
180 }
182 /**
183 * Creates a filter with blur primitive of specified radius for an item with the given matrix expansion, width and height
184 */
185 SPFilter *
186 new_filter_gaussian_blur (SPDocument *document, gdouble radius, double expansion, double expansionX, double expansionY, double width, double height)
187 {
188 g_return_val_if_fail(document != NULL, NULL);
190 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
192 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
194 // create a new filter
195 Inkscape::XML::Node *repr;
196 repr = xml_doc->createElement("svg:filter");
197 //repr->setAttribute("inkscape:collect", "always");
199 set_filter_area(repr, radius, expansion, expansionX, expansionY,
200 width, height);
202 //create feGaussianBlur node
203 Inkscape::XML::Node *b_repr;
204 b_repr = xml_doc->createElement("svg:feGaussianBlur");
205 //b_repr->setAttribute("inkscape:collect", "always");
207 double stdDeviation = radius;
208 if (expansion != 0)
209 stdDeviation /= expansion;
211 //set stdDeviation attribute
212 sp_repr_set_svg_double(b_repr, "stdDeviation", stdDeviation);
214 //set feGaussianBlur as child of filter node
215 repr->appendChild(b_repr);
216 Inkscape::GC::release(b_repr);
218 // Append the new filter node to defs
219 SP_OBJECT_REPR(defs)->appendChild(repr);
220 Inkscape::GC::release(repr);
222 // get corresponding object
223 SPFilter *f = SP_FILTER( document->getObjectByRepr(repr) );
224 SPGaussianBlur *b = SP_GAUSSIANBLUR( document->getObjectByRepr(b_repr) );
226 g_assert(f != NULL);
227 g_assert(SP_IS_FILTER(f));
228 g_assert(b != NULL);
229 g_assert(SP_IS_GAUSSIANBLUR(b));
231 return f;
232 }
235 /**
236 * Creates a simple filter with a blend primitive and a blur primitive of specified radius for
237 * an item with the given matrix expansion, width and height
238 */
239 SPFilter *
240 new_filter_blend_gaussian_blur (SPDocument *document, const char *blendmode, gdouble radius, double expansion,
241 double expansionX, double expansionY, double width, double height)
242 {
243 g_return_val_if_fail(document != NULL, NULL);
245 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
247 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
249 // create a new filter
250 Inkscape::XML::Node *repr;
251 repr = xml_doc->createElement("svg:filter");
252 repr->setAttribute("inkscape:collect", "always");
254 // Append the new filter node to defs
255 SP_OBJECT_REPR(defs)->appendChild(repr);
256 Inkscape::GC::release(repr);
258 // get corresponding object
259 SPFilter *f = SP_FILTER( document->getObjectByRepr(repr) );
261 // Gaussian blur primitive
262 if(radius != 0) {
263 set_filter_area(repr, radius, expansion, expansionX, expansionY, width, height);
265 //create feGaussianBlur node
266 Inkscape::XML::Node *b_repr;
267 b_repr = xml_doc->createElement("svg:feGaussianBlur");
268 b_repr->setAttribute("inkscape:collect", "always");
270 double stdDeviation = radius;
271 if (expansion != 0)
272 stdDeviation /= expansion;
274 //set stdDeviation attribute
275 sp_repr_set_svg_double(b_repr, "stdDeviation", stdDeviation);
277 //set feGaussianBlur as child of filter node
278 repr->appendChild(b_repr);
279 Inkscape::GC::release(b_repr);
281 SPGaussianBlur *b = SP_GAUSSIANBLUR( document->getObjectByRepr(b_repr) );
282 g_assert(b != NULL);
283 g_assert(SP_IS_GAUSSIANBLUR(b));
284 }
285 // Blend primitive
286 if(strcmp(blendmode, "normal")) {
287 Inkscape::XML::Node *b_repr;
288 b_repr = xml_doc->createElement("svg:feBlend");
289 b_repr->setAttribute("inkscape:collect", "always");
290 b_repr->setAttribute("mode", blendmode);
291 b_repr->setAttribute("in2", "BackgroundImage");
293 // set feBlend as child of filter node
294 repr->appendChild(b_repr);
295 Inkscape::GC::release(b_repr);
297 // Enable background image buffer for document
298 Inkscape::XML::Node *root = b_repr->root();
299 if (!root->attribute("enable-background")) {
300 root->setAttribute("enable-background", "new");
301 }
303 SPFeBlend *b = SP_FEBLEND(document->getObjectByRepr(b_repr));
304 g_assert(b != NULL);
305 g_assert(SP_IS_FEBLEND(b));
306 }
308 g_assert(f != NULL);
309 g_assert(SP_IS_FILTER(f));
311 return f;
312 }
314 /**
315 * Creates a simple filter for the given item with blend and blur primitives, using the
316 * specified mode and radius, respectively
317 */
318 SPFilter *
319 new_filter_simple_from_item (SPDocument *document, SPItem *item, const char *mode, gdouble radius)
320 {
321 NR::Maybe<NR::Rect> const r = sp_item_bbox_desktop(item);
323 double width;
324 double height;
325 if (r) {
326 width = r->extent(NR::X);
327 height= r->extent(NR::Y);
328 } else {
329 width = height = 0;
330 }
332 NR::Matrix i2d = sp_item_i2d_affine (item);
334 return (new_filter_blend_gaussian_blur (document, mode, radius, i2d.expansion(), i2d.expansionX(), i2d.expansionY(), width, height));
335 }
337 /**
338 * Modifies the gaussian blur applied to the item.
339 * If no filters are applied to given item, creates a new blur filter.
340 * If a filter is applied and it contains a blur, modify that blur.
341 * If the filter doesn't contain blur, a blur is added to the filter.
342 * Should there be more references to modified filter, that filter is
343 * duplicated, so that other elements referring that filter are not modified.
344 */
345 /* TODO: this should be made more generic, not just for blurs */
346 SPFilter *
347 modify_filter_gaussian_blur_from_item(SPDocument *document, SPItem *item,
348 gdouble radius)
349 {
350 if (!item->style || !item->style->filter.set) {
351 //return new_filter_gaussian_blur_from_item(document, item, radius);
352 }
354 SPFilter *filter = SP_FILTER(item->style->getFilter());
355 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
357 // If there are more users for this filter, duplicate it
358 if (SP_OBJECT_HREFCOUNT(filter) > count_filter_hrefs(item, filter)) {
359 Inkscape::XML::Node *repr;
360 repr = SP_OBJECT_REPR(item->style->getFilter())->duplicate(xml_doc);
361 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
362 SP_OBJECT_REPR(defs)->appendChild(repr);
364 filter = SP_FILTER( document->getObjectByRepr(repr) );
365 Inkscape::GC::release(repr);
366 }
368 // Determine the required standard deviation value
369 NR::Matrix i2d = sp_item_i2d_affine (item);
370 double expansion = i2d.expansion();
371 double stdDeviation = radius;
372 if (expansion != 0)
373 stdDeviation /= expansion;
375 // Get the object size
376 NR::Maybe<NR::Rect> const r = sp_item_bbox_desktop(item);
377 double width;
378 double height;
379 if (r) {
380 width = r->extent(NR::X);
381 height= r->extent(NR::Y);
382 } else {
383 width = height = 0;
384 }
386 // Set the filter effects area
387 Inkscape::XML::Node *repr = SP_OBJECT_REPR(item->style->getFilter());
388 set_filter_area(repr, radius, expansion, i2d.expansionX(),
389 i2d.expansionY(), width, height);
391 // Search for gaussian blur primitives. If found, set the stdDeviation
392 // of the first one and return.
393 Inkscape::XML::Node *primitive = repr->firstChild();
394 while (primitive) {
395 if (strcmp("svg:feGaussianBlur", primitive->name()) == 0) {
396 sp_repr_set_svg_double(primitive, "stdDeviation",
397 stdDeviation);
398 return filter;
399 }
400 primitive = primitive->next();
401 }
403 // If there were no gaussian blur primitives, create a new one
405 //create feGaussianBlur node
406 Inkscape::XML::Node *b_repr;
407 b_repr = xml_doc->createElement("svg:feGaussianBlur");
408 //b_repr->setAttribute("inkscape:collect", "always");
410 //set stdDeviation attribute
411 sp_repr_set_svg_double(b_repr, "stdDeviation", stdDeviation);
413 //set feGaussianBlur as child of filter node
414 SP_OBJECT_REPR(filter)->appendChild(b_repr);
415 Inkscape::GC::release(b_repr);
417 return filter;
418 }
420 void remove_filter (SPObject *item, bool recursive)
421 {
422 SPCSSAttr *css = sp_repr_css_attr_new ();
423 sp_repr_css_unset_property (css, "filter");
424 if (recursive)
425 sp_repr_css_change_recursive(SP_OBJECT_REPR(item), css, "style");
426 else
427 sp_repr_css_change (SP_OBJECT_REPR(item), css, "style");
428 sp_repr_css_attr_unref (css);
429 }
431 /**
432 * Removes the first feGaussianBlur from the filter attached to given item.
433 * Should this leave us with an empty filter, remove that filter.
434 */
435 /* TODO: the removed filter primitive may had had a named result image, so
436 * after removing, the filter may be in erroneous state, this situation should
437 * be handled gracefully */
438 void remove_filter_gaussian_blur (SPObject *item)
439 {
440 if (item->style && item->style->filter.set && item->style->getFilter()) {
441 // Search for the first blur primitive and remove it. (if found)
442 Inkscape::XML::Node *repr = SP_OBJECT_REPR(item->style->getFilter());
443 Inkscape::XML::Node *primitive = repr->firstChild();
444 while (primitive) {
445 if (strcmp("svg:feGaussianBlur", primitive->name()) == 0) {
446 sp_repr_unparent(primitive);
447 break;
448 }
449 primitive = primitive->next();
450 }
452 // If there are no more primitives left in this filter, discard it.
453 if (repr->childCount() == 0) {
454 remove_filter(item, false);
455 }
456 }
457 }
459 /*
460 Local Variables:
461 mode:c++
462 c-file-style:"stroustrup"
463 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
464 indent-tabs-mode:nil
465 fill-column:99
466 End:
467 */
468 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :