986b6502d460fe1a72dae6be956333367d857f74
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-rect-l.h"
21 namespace Inkscape {
22 namespace Filters {
24 FilterImage::FilterImage()
25 {
26 feImageHref=NULL;
27 image_pixbuf=NULL;
28 document=NULL;
29 }
31 FilterPrimitive * FilterImage::create() {
32 return new FilterImage();
33 }
35 FilterImage::~FilterImage()
36 {
37 if (feImageHref) g_free(feImageHref);
38 }
40 int FilterImage::render(FilterSlot &slot, FilterUnits const &units) {
41 if (!feImageHref) return 0;
43 NRPixBlock* pb = NULL;
44 bool free_pb_on_exit = false;
46 if(from_element){
47 if (!SVGElem) return 0;
49 // prep the document
50 sp_document_ensure_up_to_date(document);
51 NRArena* arena = NRArena::create();
52 unsigned const key = sp_item_display_key_new(1);
53 NRArenaItem* ai = sp_item_invoke_show(SVGElem, arena, key, SP_ITEM_SHOW_DISPLAY);
54 if (!ai) {
55 g_warning("feImage renderer: error creating NRArenaItem for SVG Element");
56 g_free(arena);
57 return 0;
58 }
59 pb = new NRPixBlock;
60 free_pb_on_exit = true;
62 Geom::OptRect area = SVGElem->getBounds(Geom::identity());
64 NRRectL rect;
65 rect.x0=area->min()[Geom::X];
66 rect.x1=area->max()[Geom::X];
67 rect.y0=area->min()[Geom::Y];
68 rect.y1=area->max()[Geom::Y];
70 width = (int)(rect.x1-rect.x0);
71 height = (int)(rect.y1-rect.y0);
73 if (image_pixbuf) g_free(image_pixbuf);
74 image_pixbuf = g_new(unsigned char, 4 * width * height);
75 memset(image_pixbuf, 0x00, 4 * width * height);
77 NRGC gc(NULL);
78 /* Update to renderable state */
79 double sf = 1.0;
80 Geom::Matrix t(Geom::Scale(sf, sf));
81 nr_arena_item_set_transform(ai, &t);
82 gc.transform.setIdentity();
83 nr_arena_item_invoke_update( ai, NULL, &gc,
84 NR_ARENA_ITEM_STATE_ALL,
85 NR_ARENA_ITEM_STATE_NONE );
86 nr_pixblock_setup_extern(pb, NR_PIXBLOCK_MODE_R8G8B8A8N,
87 (int)rect.x0, (int)rect.y0, (int)rect.x1, (int)rect.y1,
88 image_pixbuf, 4 * width, FALSE, FALSE );
90 nr_arena_item_invoke_render(NULL, ai, &rect, pb, NR_ARENA_ITEM_RENDER_NO_CACHE);
92 nr_arena_item_unref(ai);
93 nr_object_unref((NRObject *) arena);
94 }
97 if (!image_pixbuf){
98 try {
99 gchar *fullname = feImageHref;
100 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
101 // Try to load from relative postion combined with document base
102 if( document ) {
103 fullname = g_build_filename( document->base, feImageHref, NULL );
104 }
105 }
106 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
107 // Should display Broken Image png.
108 g_warning("FilterImage::render: Can not find: %s", feImageHref );
109 }
110 image = Gdk::Pixbuf::create_from_file(fullname);
111 if( fullname != feImageHref ) g_free( fullname );
112 }
113 catch (const Glib::FileError & e)
114 {
115 g_warning("caught Glib::FileError in FilterImage::render %i", e.code() );
116 return 0;
117 }
118 catch (const Gdk::PixbufError & e)
119 {
120 g_warning("Gdk::PixbufError in FilterImage::render: %i", e.code() );
121 return 0;
122 }
123 if ( !image ) return 0;
125 // Native size of image
126 width = image->get_width();
127 height = image->get_height();
128 rowstride = image->get_rowstride();
129 image_pixbuf = image->get_pixels();
130 }
131 int w,x,y;
132 NRPixBlock *in = slot.get(_input);
133 if (!in) {
134 g_warning("Missing source image for feImage (in=%d)", _input);
135 return 1;
136 }
138 // This section needs to be fully tested!!
140 // Region being drawn on screen
141 int x0 = in->area.x0, y0 = in->area.y0;
142 int x1 = in->area.x1, y1 = in->area.y1;
143 NRPixBlock *out = new NRPixBlock;
144 nr_pixblock_setup_fast(out, in->mode, x0, y0, x1, y1, true);
145 w = x1 - x0;
147 // Get the object bounding box. Image is placed with respect to box.
148 // Array values: 0: width; 3: height; 4: -x; 5: -y.
149 Geom::Matrix object_bbox = units.get_matrix_user2filterunits().inverse();
151 // feImage is suppose to use the same parameters as a normal SVG image.
152 // If a width or height is set to zero, the image is not suppose to be displayed.
153 // This does not seem to be what Firefox or Opera does, nor does the W3C displacement
154 // filter test expect this behavior. If the width and/or height are zero, we use
155 // the width and height of the object bounding box.
156 if( feImageWidth == 0 ) feImageWidth = object_bbox[0];
157 if( feImageHeight == 0 ) feImageHeight = object_bbox[3];
159 double scaleX = width/feImageWidth;
160 double scaleY = height/feImageHeight;
162 int coordx,coordy;
163 unsigned char *out_data = NR_PIXBLOCK_PX(out);
164 Geom::Matrix unit_trans = units.get_matrix_primitiveunits2pb().inverse();
165 for (x=x0; x < x1; x++){
166 for (y=y0; y < y1; y++){
167 //TODO: use interpolation
168 // Temporarily add 0.5 so we sample center of "cell"
169 double indexX = scaleX * (((x+0.5) * unit_trans[0] + unit_trans[4]) - feImageX + object_bbox[4]);
170 double indexY = scaleY * (((y+0.5) * unit_trans[3] + unit_trans[5]) - feImageY + object_bbox[5]);
172 // coordx == 0 and coordy == 0 must be included, but we protect
173 // against negative numbers which round up to 0 with (int).
174 coordx = ( indexX >= 0 ? int( indexX ) : -1 );
175 coordy = ( indexY >= 0 ? int( indexY ) : -1 );
176 if (coordx >= 0 && coordx < width && coordy >= 0 && coordy < height){
177 if (from_element){
178 out_data[4*((x - x0)+w*(y - y0))] = (unsigned char) image_pixbuf[4*(coordx + width*coordy)]; //Red
179 out_data[4*((x - x0)+w*(y - y0)) + 1] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 1]; //Green
180 out_data[4*((x - x0)+w*(y - y0)) + 2] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 2]; //Blue
181 out_data[4*((x - x0)+w*(y - y0)) + 3] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 3]; //Alpha
182 } else {
183 out_data[4*((x - x0)+w*(y - y0))] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy]; //Red
184 out_data[4*((x - x0)+w*(y - y0)) + 1] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 1]; //Green
185 out_data[4*((x - x0)+w*(y - y0)) + 2] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 2]; //Blue
186 out_data[4*((x - x0)+w*(y - y0)) + 3] = 255; //Alpha
187 }
188 }
189 }
190 }
191 if (free_pb_on_exit) nr_pixblock_release(pb);
193 out->empty = FALSE;
194 slot.set(_output, out);
195 return 0;
196 }
198 void FilterImage::set_href(const gchar *href){
199 if (feImageHref) g_free (feImageHref);
200 feImageHref = (href) ? g_strdup (href) : NULL;
201 }
203 void FilterImage::set_document(SPDocument *doc){
204 document = doc;
205 }
207 void FilterImage::set_region(SVGLength x, SVGLength y, SVGLength width, SVGLength height){
208 feImageX=x.computed;
209 feImageY=y.computed;
210 feImageWidth=width.computed;
211 feImageHeight=height.computed;
212 }
214 FilterTraits FilterImage::get_input_traits() {
215 return TRAIT_PARALLER;
216 }
218 } /* namespace Filters */
219 } /* namespace Inkscape */
221 /*
222 Local Variables:
223 mode:c++
224 c-file-style:"stroustrup"
225 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
226 indent-tabs-mode:nil
227 fill-column:99
228 End:
229 */
230 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :