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-matrix.h"
20 #include "libnr/nr-rect-l.h"
22 namespace NR {
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 Matrix identity(1.0, 0.0,
63 0.0, 1.0,
64 0.0, 0.0);
65 NR::Maybe<NR::Rect> area = SVGElem->getBounds(identity);
67 NRRectL rect;
68 rect.x0=area->min()[NR::X];
69 rect.x1=area->max()[NR::X];
70 rect.y0=area->min()[NR::Y];
71 rect.y1=area->max()[NR::Y];
73 width = (int)(rect.x1-rect.x0);
74 height = (int)(rect.y1-rect.y0);
76 if (image_pixbuf) g_free(image_pixbuf);
77 image_pixbuf = g_new(unsigned char, 4 * width * height);
78 memset(image_pixbuf, 0x00, 4 * width * height);
80 NRGC gc(NULL);
81 /* Update to renderable state */
82 double sf = 1.0;
83 NR::Matrix t(NR::scale(sf, sf));
84 nr_arena_item_set_transform(ai, &t);
85 gc.transform.set_identity();
86 nr_arena_item_invoke_update( ai, NULL, &gc,
87 NR_ARENA_ITEM_STATE_ALL,
88 NR_ARENA_ITEM_STATE_NONE );
89 nr_pixblock_setup_extern(pb, NR_PIXBLOCK_MODE_R8G8B8A8N,
90 (int)rect.x0, (int)rect.y0, (int)rect.x1, (int)rect.y1,
91 image_pixbuf, 4 * width, FALSE, FALSE );
93 nr_arena_item_invoke_render(NULL, ai, &rect, pb, NR_ARENA_ITEM_RENDER_NO_CACHE);
95 nr_arena_item_unref(ai);
96 nr_object_unref((NRObject *) arena);
97 }
100 if (!image_pixbuf){
101 try {
102 gchar *fullname = feImageHref;
103 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
104 // Try to load from relative postion combined with document base
105 if( document ) {
106 fullname = g_build_filename( document->base, feImageHref, NULL );
107 }
108 }
109 if ( !g_file_test( fullname, G_FILE_TEST_EXISTS ) ) {
110 // Should display Broken Image png.
111 g_warning("FilterImage::render: Can not find: %s", feImageHref );
112 }
113 image = Gdk::Pixbuf::create_from_file(fullname);
114 if( fullname != feImageHref ) g_free( fullname );
115 }
116 catch (const Glib::FileError & e)
117 {
118 g_warning("caught Glib::FileError in FilterImage::render %i", e.code() );
119 return 0;
120 }
121 catch (const Gdk::PixbufError & e)
122 {
123 g_warning("Gdk::PixbufError in FilterImage::render: %i", e.code() );
124 return 0;
125 }
126 if ( !image ) return 0;
128 // Native size of image
129 width = image->get_width();
130 height = image->get_height();
131 rowstride = image->get_rowstride();
132 image_pixbuf = image->get_pixels();
133 }
134 int w,x,y;
135 NRPixBlock *in = slot.get(_input);
136 if (!in) {
137 g_warning("Missing source image for feImage (in=%d)", _input);
138 return 1;
139 }
141 // This section needs to be fully tested!!
143 // Region being drawn on screen
144 int x0 = in->area.x0, y0 = in->area.y0;
145 int x1 = in->area.x1, y1 = in->area.y1;
146 NRPixBlock *out = new NRPixBlock;
147 nr_pixblock_setup_fast(out, in->mode, x0, y0, x1, y1, true);
148 w = x1 - x0;
150 // Get the object bounding box. Image is placed with respect to box.
151 // Array values: 0: width; 3: height; 4: -x; 5: -y.
152 Matrix object_bbox = units.get_matrix_user2filterunits().inverse();
154 // feImage is suppose to use the same parameters as a normal SVG image.
155 // If a width or height is set to zero, the image is not suppose to be displayed.
156 // This does not seem to be what Firefox or Opera does, nor does the W3C displacement
157 // filter test expect this behavior. If the width and/or height are zero, we use
158 // the width and height of the object bounding box.
159 if( feImageWidth == 0 ) feImageWidth = object_bbox[0];
160 if( feImageHeight == 0 ) feImageHeight = object_bbox[3];
162 double scaleX = width/feImageWidth;
163 double scaleY = height/feImageHeight;
165 int coordx,coordy;
166 unsigned char *out_data = NR_PIXBLOCK_PX(out);
167 Matrix unit_trans = units.get_matrix_primitiveunits2pb().inverse();
168 for (x=x0; x < x1; x++){
169 for (y=y0; y < y1; y++){
170 //TODO: use interpolation
171 // Temporarily add 0.5 so we sample center of "cell"
172 double indexX = scaleX * (((x+0.5) * unit_trans[0] + unit_trans[4]) - feImageX + object_bbox[4]);
173 double indexY = scaleY * (((y+0.5) * unit_trans[3] + unit_trans[5]) - feImageY + object_bbox[5]);
175 // coordx == 0 and coordy == 0 must be included, but we protect
176 // against negative numbers which round up to 0 with (int).
177 coordx = ( indexX >= 0 ? int( indexX ) : -1 );
178 coordy = ( indexY >= 0 ? int( indexY ) : -1 );
179 if (coordx >= 0 && coordx < width && coordy >= 0 && coordy < height){
180 if (from_element){
181 out_data[4*((x - x0)+w*(y - y0))] = (unsigned char) image_pixbuf[4*(coordx + width*coordy)]; //Red
182 out_data[4*((x - x0)+w*(y - y0)) + 1] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 1]; //Green
183 out_data[4*((x - x0)+w*(y - y0)) + 2] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 2]; //Blue
184 out_data[4*((x - x0)+w*(y - y0)) + 3] = (unsigned char) image_pixbuf[4*(coordx + width*coordy) + 3]; //Alpha
185 } else {
186 out_data[4*((x - x0)+w*(y - y0))] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy]; //Red
187 out_data[4*((x - x0)+w*(y - y0)) + 1] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 1]; //Green
188 out_data[4*((x - x0)+w*(y - y0)) + 2] = (unsigned char) image_pixbuf[3*coordx + rowstride*coordy + 2]; //Blue
189 out_data[4*((x - x0)+w*(y - y0)) + 3] = 255; //Alpha
190 }
191 }
192 }
193 }
194 if (free_pb_on_exit) nr_pixblock_release(pb);
196 out->empty = FALSE;
197 slot.set(_output, out);
198 return 0;
199 }
201 void FilterImage::set_href(const gchar *href){
202 if (feImageHref) g_free (feImageHref);
203 feImageHref = (href) ? g_strdup (href) : NULL;
204 }
206 void FilterImage::set_document(SPDocument *doc){
207 document = doc;
208 }
210 void FilterImage::set_region(SVGLength x, SVGLength y, SVGLength width, SVGLength height){
211 feImageX=x.computed;
212 feImageY=y.computed;
213 feImageWidth=width.computed;
214 feImageHeight=height.computed;
215 }
217 FilterTraits FilterImage::get_input_traits() {
218 return TRAIT_PARALLER;
219 }
221 } /* namespace NR */
223 /*
224 Local Variables:
225 mode:c++
226 c-file-style:"stroustrup"
227 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
228 indent-tabs-mode:nil
229 fill-column:99
230 End:
231 */
232 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :