7b802fee3c0877b461ddc2643629a6754f99c8a7
1 /** \file
2 * SPIcon: Generic icon widget
3 */
4 /*
5 * Copyright (C) 2007 Bryce W. Harrington <bryce@bryceharrington.org>
6 *
7 * Released under GNU GPL, read the file 'COPYING' for more information
8 *
9 */
11 GdkPixbuf* get_pixbuf(GdkPixbuf* pixbuf) {
12 return pixbuf;
13 }
15 GdkPixbuf* render_pixbuf(NRArenaItem* root, double scale_factor, const NR::Rect& dbox, unsigned psize) {
16 NRGC gc(NULL);
17 NRMatrix t;
19 nr_matrix_set_scale(&t, scale_factor, scale_factor);
20 nr_arena_item_set_transform(root, &t);
22 nr_matrix_set_identity(&gc.transform);
23 nr_arena_item_invoke_update( root, NULL, &gc,
24 NR_ARENA_ITEM_STATE_ALL,
25 NR_ARENA_ITEM_STATE_NONE );
27 /* Item integer bbox in points */
28 NRRectL ibox;
29 ibox.x0 = (int) floor(scale_factor * dbox.min()[NR::X] + 0.5);
30 ibox.y0 = (int) floor(scale_factor * dbox.min()[NR::Y] + 0.5);
31 ibox.x1 = (int) floor(scale_factor * dbox.max()[NR::X] + 0.5);
32 ibox.y1 = (int) floor(scale_factor * dbox.max()[NR::Y] + 0.5);
34 /* Find visible area */
35 int width = ibox.x1 - ibox.x0;
36 int height = ibox.y1 - ibox.y0;
37 int dx = psize;
38 int dy = psize;
39 dx = (dx - width)/2; // watch out for size, since 'unsigned'-'signed' can cause problems if the result is negative
40 dy = (dy - height)/2;
42 NRRectL area;
43 area.x0 = ibox.x0 - dx;
44 area.y0 = ibox.y0 - dy;
45 area.x1 = area.x0 + psize;
46 area.y1 = area.y0 + psize;
48 /* Actual renderable area */
49 NRRectL ua;
50 ua.x0 = std::max(ibox.x0, area.x0);
51 ua.y0 = std::max(ibox.y0, area.y0);
52 ua.x1 = std::min(ibox.x1, area.x1);
53 ua.y1 = std::min(ibox.y1, area.y1);
55 /* Set up pixblock */
56 guchar *px = g_new(guchar, 4 * psize * psize);
57 memset(px, 0x00, 4 * psize * psize);
59 /* Render */
60 NRPixBlock B;
61 nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
62 ua.x0, ua.y0, ua.x1, ua.y1,
63 px + 4 * psize * (ua.y0 - area.y0) +
64 4 * (ua.x0 - area.x0),
65 4 * psize, FALSE, FALSE );
66 nr_arena_item_invoke_render( root, &ua, &B,
67 NR_ARENA_ITEM_RENDER_NO_CACHE );
68 nr_pixblock_release(&B);
70 GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(px,
71 GDK_COLORSPACE_RGB,
72 TRUE,
73 8, psize, psize, psize * 4,
74 (GdkPixbufDestroyNotify)g_free,
75 NULL);
77 return pixbuf;
78 }