1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /** \file
3 * Superclass for all the filter primitives
4 *
5 */
6 /*
7 * Authors:
8 * Kees Cook <kees@outflux.net>
9 * Niko Kiirala <niko@kiirala.com>
10 * Abhishek Sharma
11 *
12 * Copyright (C) 2004-2007 Authors
13 *
14 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
15 */
16
17 #include <cstring>
18
19 #include "sp-filter-primitive.h"
20
21 #include "attributes.h"
22
23 #include "display/nr-filter-primitive.h"
24
25 #include "style.h"
26
27
28 // CPPIFY: Make pure virtual.
29 //void SPFilterPrimitive::build_renderer(Inkscape::Filters::Filter* filter) {
30 // throw;
31 //}
32
SPFilterPrimitive()33 SPFilterPrimitive::SPFilterPrimitive() : SPObject() {
34 this->image_in = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
35 this->image_out = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
36
37 // We must keep track if a value is set or not, if not set then the region defaults to 0%, 0%,
38 // 100%, 100% ("x", "y", "width", "height") of the -> filter <- region. If set then
39 // percentages are in terms of bounding box or viewbox, depending on value of "primitiveUnits"
40
41 // NB: SVGLength.set takes prescaled percent values: 1 means 100%
42 this->x.unset(SVGLength::PERCENT, 0, 0);
43 this->y.unset(SVGLength::PERCENT, 0, 0);
44 this->width.unset(SVGLength::PERCENT, 1, 0);
45 this->height.unset(SVGLength::PERCENT, 1, 0);
46 }
47
48 SPFilterPrimitive::~SPFilterPrimitive() = default;
49
50 /**
51 * Reads the Inkscape::XML::Node, and initializes SPFilterPrimitive variables. For this to get called,
52 * our name must be associated with a repr via "sp_object_type_register". Best done through
53 * sp-object-repr.cpp's repr_name_entries array.
54 */
build(SPDocument * document,Inkscape::XML::Node * repr)55 void SPFilterPrimitive::build(SPDocument *document, Inkscape::XML::Node *repr) {
56 SPFilterPrimitive* object = this;
57
58 object->readAttr(SPAttr::STYLE); // struct not derived from SPItem, we need to do this ourselves.
59 object->readAttr(SPAttr::IN_);
60 object->readAttr(SPAttr::RESULT);
61 object->readAttr(SPAttr::X);
62 object->readAttr(SPAttr::Y);
63 object->readAttr(SPAttr::WIDTH);
64 object->readAttr(SPAttr::HEIGHT);
65
66 SPObject::build(document, repr);
67 }
68
69 /**
70 * Drops any allocated memory.
71 */
release()72 void SPFilterPrimitive::release() {
73 SPObject::release();
74 }
75
76 /**
77 * Sets a specific value in the SPFilterPrimitive.
78 */
set(SPAttr key,gchar const * value)79 void SPFilterPrimitive::set(SPAttr key, gchar const *value) {
80
81 int image_nr;
82 switch (key) {
83 case SPAttr::IN_:
84 if (value) {
85 image_nr = this->read_in(value);
86 } else {
87 image_nr = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
88 }
89 if (image_nr != this->image_in) {
90 this->image_in = image_nr;
91 this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
92 }
93 break;
94 case SPAttr::RESULT:
95 if (value) {
96 image_nr = this->read_result(value);
97 } else {
98 image_nr = Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
99 }
100 if (image_nr != this->image_out) {
101 this->image_out = image_nr;
102 this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
103 }
104 break;
105
106 /* Filter primitive sub-region */
107 case SPAttr::X:
108 this->x.readOrUnset(value);
109 this->requestModified(SP_OBJECT_MODIFIED_FLAG);
110 break;
111 case SPAttr::Y:
112 this->y.readOrUnset(value);
113 this->requestModified(SP_OBJECT_MODIFIED_FLAG);
114 break;
115 case SPAttr::WIDTH:
116 this->width.readOrUnset(value);
117 this->requestModified(SP_OBJECT_MODIFIED_FLAG);
118 break;
119 case SPAttr::HEIGHT:
120 this->height.readOrUnset(value);
121 this->requestModified(SP_OBJECT_MODIFIED_FLAG);
122 break;
123 }
124
125 /* See if any parents need this value. */
126 SPObject::set(key, value);
127 }
128
129 /**
130 * Receives update notifications.
131 */
update(SPCtx * ctx,guint flags)132 void SPFilterPrimitive::update(SPCtx *ctx, guint flags) {
133
134 SPItemCtx *ictx = (SPItemCtx *) ctx;
135
136 // Do here since we know viewport (Bounding box case handled during rendering)
137 SPFilter *parent = SP_FILTER(this->parent);
138
139 if( parent->primitiveUnits == SP_FILTER_UNITS_USERSPACEONUSE ) {
140 this->calcDimsFromParentViewport(ictx, true);
141 }
142
143 SPObject::update(ctx, flags);
144 }
145
146 /**
147 * Writes its settings to an incoming repr object, if any.
148 */
write(Inkscape::XML::Document * doc,Inkscape::XML::Node * repr,guint flags)149 Inkscape::XML::Node* SPFilterPrimitive::write(Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags) {
150 SPFilterPrimitive* object = this;
151
152 SPFilterPrimitive *prim = SP_FILTER_PRIMITIVE(object);
153 SPFilter *parent = SP_FILTER(object->parent);
154
155 if (!repr) {
156 repr = object->getRepr()->duplicate(doc);
157 }
158
159 gchar const *in_name = parent->name_for_image(prim->image_in);
160 repr->setAttribute("in", in_name);
161
162 gchar const *out_name = parent->name_for_image(prim->image_out);
163 repr->setAttribute("result", out_name);
164
165 /* Do we need to add x,y,width,height? */
166 SPObject::write(doc, repr, flags);
167
168 return repr;
169 }
170
read_in(gchar const * name)171 int SPFilterPrimitive::read_in(gchar const *name)
172 {
173 if (!name){
174 return Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
175 }
176 // TODO: are these case sensitive or not? (assumed yes)
177 switch (name[0]) {
178 case 'S':
179 if (strcmp(name, "SourceGraphic") == 0)
180 return Inkscape::Filters::NR_FILTER_SOURCEGRAPHIC;
181 if (strcmp(name, "SourceAlpha") == 0)
182 return Inkscape::Filters::NR_FILTER_SOURCEALPHA;
183 if (strcmp(name, "StrokePaint") == 0)
184 return Inkscape::Filters::NR_FILTER_STROKEPAINT;
185 break;
186 case 'B':
187 if (strcmp(name, "BackgroundImage") == 0)
188 return Inkscape::Filters::NR_FILTER_BACKGROUNDIMAGE;
189 if (strcmp(name, "BackgroundAlpha") == 0)
190 return Inkscape::Filters::NR_FILTER_BACKGROUNDALPHA;
191 break;
192 case 'F':
193 if (strcmp(name, "FillPaint") == 0)
194 return Inkscape::Filters::NR_FILTER_FILLPAINT;
195 break;
196 }
197
198 SPFilter *parent = SP_FILTER(this->parent);
199 int ret = parent->get_image_name(name);
200 if (ret >= 0) return ret;
201
202 return Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
203 }
204
read_result(gchar const * name)205 int SPFilterPrimitive::read_result(gchar const *name)
206 {
207 SPFilter *parent = SP_FILTER(this->parent);
208 int ret = parent->get_image_name(name);
209 if (ret >= 0) return ret;
210
211 ret = parent->set_image_name(name);
212 if (ret >= 0) return ret;
213
214 return Inkscape::Filters::NR_FILTER_SLOT_NOT_SET;
215 }
216
217 /**
218 * Gives name for output of previous filter. Makes things clearer when 'this'
219 * is a filter with two or more inputs. Returns the slot number of result
220 * of previous primitive, or NR_FILTER_SOURCEGRAPHIC if this is the first
221 * primitive.
222 */
name_previous_out()223 int SPFilterPrimitive::name_previous_out() {
224 SPFilter *parent = SP_FILTER(this->parent);
225 SPObject *i = parent->firstChild();
226 while (i && i->getNext() != this) {
227 i = i->getNext();
228 }
229 if (i) {
230 SPFilterPrimitive *i_prim = SP_FILTER_PRIMITIVE(i);
231 if (i_prim->image_out < 0) {
232 Glib::ustring name = parent->get_new_result_name();
233 int slot = parent->set_image_name(name.c_str());
234 i_prim->image_out = slot;
235 //XML Tree is being directly used while it shouldn't be.
236 i_prim->setAttributeOrRemoveIfEmpty("result", name);
237 return slot;
238 } else {
239 return i_prim->image_out;
240 }
241 }
242 return Inkscape::Filters::NR_FILTER_SOURCEGRAPHIC;
243 }
244
245 /* Common initialization for filter primitives */
renderer_common(Inkscape::Filters::FilterPrimitive * nr_prim)246 void SPFilterPrimitive::renderer_common(Inkscape::Filters::FilterPrimitive *nr_prim)
247 {
248 g_assert(nr_prim != nullptr);
249
250
251 nr_prim->set_input(this->image_in);
252 nr_prim->set_output(this->image_out);
253
254 /* TODO: place here code to handle input images, filter area etc. */
255 // We don't know current viewport or bounding box, this is wrong approach.
256 nr_prim->set_subregion( this->x, this->y, this->width, this->height );
257
258 // Give renderer access to filter properties
259 nr_prim->setStyle( this->style );
260 }
261
262 /* Calculate the region taken up by this filter, given the previous region.
263 *
264 * @param current_region The original shape's region or previous primitive's
265 * calcualte_region output.
266 */
calculate_region(Geom::Rect region)267 Geom::Rect SPFilterPrimitive::calculate_region(Geom::Rect region)
268 {
269 return region; // No change.
270 }
271
272
273 /*
274 Local Variables:
275 mode:c++
276 c-file-style:"stroustrup"
277 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
278 indent-tabs-mode:nil
279 fill-column:99
280 End:
281 */
282 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
283