1 /*
2 * feImage filter primitive renderer
3 *
4 * Authors:
5 * Felipe CorrĂȘa da Silva Sanches <felipe.sanches@gmail.com>
6 * Tavmjong Bah <tavmjong@free.fr>
7 *
8 * Copyright (C) 2007 authors
9 *
10 * Released under GNU GPL, read the file 'COPYING' for more information
11 */
12 #include "document.h"
13 #include "sp-item.h"
14 #include "display/nr-arena.h"
15 #include "display/nr-arena-item.h"
16 #include "display/nr-filter.h"
17 #include "display/nr-filter-image.h"
18 #include "display/nr-filter-units.h"
19 #include "libnr/nr-compose-transform.h"
20 #include "libnr/nr-rect-l.h"
21 #include "preferences.h"
23 namespace Inkscape {
24 namespace Filters {
26 FilterImage::FilterImage() :
27 SVGElem(0),
28 document(0),
29 feImageHref(0),
30 image_pixbuf(0)
31 { }
33 FilterPrimitive * FilterImage::create() {
34 return new FilterImage();
35 }
37 FilterImage::~FilterImage()
38 {
39 if (feImageHref) g_free(feImageHref);
40 }
42 int FilterImage::render(FilterSlot &slot, FilterUnits const &units) {
43 if (!feImageHref) return 0;
45 NRPixBlock* pb = NULL;
46 bool free_pb_on_exit = false;
48 if(from_element){
49 if (!SVGElem) return 0;
51 // prep the document
52 sp_document_ensure_up_to_date(document);
53 NRArena* arena = NRArena::create();
54 unsigned const key = sp_item_display_key_new(1);
55 NRArenaItem* ai = sp_item_invoke_show(SVGElem, arena, key, SP_ITEM_SHOW_DISPLAY);
56 if (!ai) {
57 g_warning("feImage renderer: error creating NRArenaItem for SVG Element");
58 nr_object_unref((NRObject *) arena);
59 return 0;
60 }
62 pb = new NRPixBlock;
63 free_pb_on_exit = true;
65 Geom::OptRect area = SVGElem->getBounds(Geom::identity());
67 NRRectL rect;
68 rect.x0=area->min()[Geom::X];
69 rect.x1=area->max()[Geom::X];
70 rect.y0=area->min()[Geom::Y];
71 rect.y1=area->max()[Geom::Y];
73 width = (int)(rect.x1-rect.x0);
74 height = (int)(rect.y1-rect.y0);
75 rowstride = 4*width;
76 has_alpha = true;
78 if (image_pixbuf) g_free(image_pixbuf);
79 image_pixbuf = g_try_new(unsigned char, 4L * width * height);
80 if(image_pixbuf != NULL)
81 {
82 memset(image_pixbuf, 0x00, 4 * width * height);
84 NRGC gc(NULL);
85 /* Update to renderable state */
86 double sf = 1.0;
87 Geom::Matrix t(Geom::Scale(sf, sf));
88 nr_arena_item_set_transform(ai, &t);
89 gc.transform.setIdentity();
90 nr_arena_item_invoke_update( ai, NULL, &gc,
91 NR_ARENA_ITEM_STATE_ALL,
92 NR_ARENA_ITEM_STATE_NONE );
93 nr_pixblock_setup_extern(pb, NR_PIXBLOCK_MODE_R8G8B8A8N,
94 (int)rect.x0, (int)rect.y0, (int)rect.x1, (int)rect.y1,
95 image_pixbuf, 4 * width, FALSE, FALSE );
97 nr_arena_item_invoke_render(NULL, ai, &rect, pb, NR_ARENA_ITEM_RENDER_NO_CACHE);
98 }
99 else
100 {
101 g_warning("FilterImage::render: not enough memory to create pixel buffer. Need %ld.", 4L * width * height);
102 }
103 sp_item_invoke_hide(SVGElem, key);
104 nr_object_unref((NRObject *) arena);
105 }
108 if (!image_pixbuf){
109 try {
110 gchar *fullname = feImageHref;
111 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
112 // Try to load from relative postion combined with document base
113 if( document ) {
114 fullname = g_build_filename( document->base, feImageHref, NULL );
115 }
116 }
117 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
118 // Should display Broken Image png.
119 g_warning("FilterImage::render: Can not find: %s", feImageHref );
120 }
121 image = Gdk::Pixbuf::create_from_file(fullname);
122 if( fullname != feImageHref ) g_free( fullname );
123 }
124 catch (const Glib::FileError & e)
125 {
126 g_warning("caught Glib::FileError in FilterImage::render %i", e.code() );
127 return 0;
128 }
129 catch (const Gdk::PixbufError & e)
130 {
131 g_warning("Gdk::PixbufError in FilterImage::render: %i", e.code() );
132 return 0;
133 }
134 if ( !image ) return 0;
136 // Native size of image
137 width = image->get_width();
138 height = image->get_height();
139 rowstride = image->get_rowstride();
140 image_pixbuf = image->get_pixels();
141 has_alpha = image->get_has_alpha();
142 }
143 int w,x,y;
144 NRPixBlock *in = slot.get(_input);
145 if (!in) {
146 g_warning("Missing source image for feImage (in=%d)", _input);
147 return 1;
148 }
150 // This section needs to be fully tested!!
152 // Region being drawn on screen
153 int x0 = in->area.x0, y0 = in->area.y0;
154 int x1 = in->area.x1, y1 = in->area.y1;
155 NRPixBlock *out = new NRPixBlock;
156 nr_pixblock_setup_fast(out, NR_PIXBLOCK_MODE_R8G8B8A8P, x0, y0, x1, y1, true);
157 w = x1 - x0;
159 // Get the object bounding box. Image is placed with respect to box.
160 // Array values: 0: width; 3: height; 4: -x; 5: -y.
161 Geom::Matrix object_bbox = units.get_matrix_user2filterunits().inverse();
163 // feImage is suppose to use the same parameters as a normal SVG image.
164 // If a width or height is set to zero, the image is not suppose to be displayed.
165 // This does not seem to be what Firefox or Opera does, nor does the W3C displacement
166 // filter test expect this behavior. If the width and/or height are zero, we use
167 // the width and height of the object bounding box.
168 if( feImageWidth == 0 ) feImageWidth = object_bbox[0];
169 if( feImageHeight == 0 ) feImageHeight = object_bbox[3];
171 double scaleX = width/feImageWidth;
172 double scaleY = height/feImageHeight;
174 int coordx,coordy;
175 unsigned char *out_data = NR_PIXBLOCK_PX(out);
176 Geom::Matrix unit_trans = units.get_matrix_primitiveunits2pb().inverse();
177 Geom::Matrix d2s = Geom::Translate(x0, y0) * unit_trans * Geom::Translate(object_bbox[4]-feImageX, object_bbox[5]-feImageY) * Geom::Scale(scaleX, scaleY);
179 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
180 int nr_arena_image_x_sample = prefs->getInt("/options/bitmapoversample/value", 1);
181 int nr_arena_image_y_sample = nr_arena_image_x_sample;
183 if (has_alpha) {
184 nr_R8G8B8A8_P_R8G8B8A8_P_R8G8B8A8_N_TRANSFORM(out_data, x1-x0, y1-y0, 4*w, image_pixbuf, width, height, rowstride, d2s, 255, nr_arena_image_x_sample, nr_arena_image_y_sample);
185 } else {
186 for (x=x0; x < x1; x++){
187 for (y=y0; y < y1; y++){
188 //TODO: use interpolation
189 // Temporarily add 0.5 so we sample center of "cell"
190 double indexX = scaleX * (((x+0.5) * unit_trans[0] + unit_trans[4]) - feImageX + object_bbox[4]);
191 double indexY = scaleY * (((y+0.5) * unit_trans[3] + unit_trans[5]) - feImageY + object_bbox[5]);
193 // coordx == 0 and coordy == 0 must be included, but we protect
194 // against negative numbers which round up to 0 with (int).
195 coordx = ( indexX >= 0 ? int( indexX ) : -1 );
196 coordy = ( indexY >= 0 ? int( indexY ) : -1 );
197 if (coordx >= 0 && coordx < width && coordy >= 0 && coordy < height){
198 out_data[4*((x - x0)+w*(y - y0)) ] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy ]; //Red
199 out_data[4*((x - x0)+w*(y - y0)) + 1] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 1]; //Green
200 out_data[4*((x - x0)+w*(y - y0)) + 2] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 2]; //Blue
201 out_data[4*((x - x0)+w*(y - y0)) + 3] = 255; //Alpha
202 }
203 }
204 }
205 }
206 if (free_pb_on_exit) {
207 nr_pixblock_release(pb);
208 delete pb;
209 }
211 out->empty = FALSE;
212 slot.set(_output, out);
213 return 0;
214 }
216 void FilterImage::set_href(const gchar *href){
217 if (feImageHref) g_free (feImageHref);
218 feImageHref = (href) ? g_strdup (href) : NULL;
219 }
221 void FilterImage::set_document(SPDocument *doc){
222 document = doc;
223 }
225 void FilterImage::set_region(SVGLength x, SVGLength y, SVGLength width, SVGLength height){
226 feImageX=x.computed;
227 feImageY=y.computed;
228 feImageWidth=width.computed;
229 feImageHeight=height.computed;
230 }
232 FilterTraits FilterImage::get_input_traits() {
233 return TRAIT_PARALLER;
234 }
236 } /* namespace Filters */
237 } /* namespace Inkscape */
239 /*
240 Local Variables:
241 mode:c++
242 c-file-style:"stroustrup"
243 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
244 indent-tabs-mode:nil
245 fill-column:99
246 End:
247 */
248 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :