1 /** \file
2 * SPIcon: Generic icon widget
3 */
4 /*
5 * Authors:
6 * Lauris Kaplinski <lauris@kaplinski.com>
7 * Bryce Harrington <brycehar@bryceharrington.org>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 2001-2005 authors
11 * Copyright (C) 2001 Ximian, Inc.
12 * Copyright (C) 2004 John Cliff
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 *
16 */
18 #ifdef HAVE_CONFIG_H
19 # include "config.h"
20 #endif
22 #include <glib/gmem.h>
23 #include <gtk/gtk.h>
24 #include "sp-namedview.h"
25 #include "selection.h"
26 #include "inkscape.h"
27 #include "sp-rect.h"
28 #include "document-private.h"
29 #include "display/nr-arena.h"
30 #include "display/nr-arena-item.h"
32 #include "ui/cache/svg_preview_cache.h"
34 GdkPixbuf* render_pixbuf(NRArenaItem* root, double scale_factor, const Geom::Rect& dbox, unsigned psize) {
35 NRGC gc(NULL);
37 Geom::Matrix t(Geom::Scale(scale_factor, scale_factor));
38 nr_arena_item_set_transform(root, t);
40 gc.transform.setIdentity();
41 nr_arena_item_invoke_update( root, NULL, &gc,
42 NR_ARENA_ITEM_STATE_ALL,
43 NR_ARENA_ITEM_STATE_NONE );
45 /* Item integer bbox in points */
46 NRRectL ibox;
47 ibox.x0 = (int) floor(scale_factor * dbox.min()[Geom::X] + 0.5);
48 ibox.y0 = (int) floor(scale_factor * dbox.min()[Geom::Y] + 0.5);
49 ibox.x1 = (int) floor(scale_factor * dbox.max()[Geom::X] + 0.5);
50 ibox.y1 = (int) floor(scale_factor * dbox.max()[Geom::Y] + 0.5);
52 /* Find visible area */
53 int width = ibox.x1 - ibox.x0;
54 int height = ibox.y1 - ibox.y0;
55 int dx = psize;
56 int dy = psize;
57 dx = (dx - width)/2; // watch out for size, since 'unsigned'-'signed' can cause problems if the result is negative
58 dy = (dy - height)/2;
60 NRRectL area;
61 area.x0 = ibox.x0 - dx;
62 area.y0 = ibox.y0 - dy;
63 area.x1 = area.x0 + psize;
64 area.y1 = area.y0 + psize;
66 /* Actual renderable area */
67 NRRectL ua;
68 ua.x0 = std::max(ibox.x0, area.x0);
69 ua.y0 = std::max(ibox.y0, area.y0);
70 ua.x1 = std::min(ibox.x1, area.x1);
71 ua.y1 = std::min(ibox.y1, area.y1);
73 /* Set up pixblock */
74 guchar *px = g_new(guchar, 4 * psize * psize);
75 memset(px, 0x00, 4 * psize * psize);
77 /* Render */
78 NRPixBlock B;
79 nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
80 ua.x0, ua.y0, ua.x1, ua.y1,
81 px + 4 * psize * (ua.y0 - area.y0) +
82 4 * (ua.x0 - area.x0),
83 4 * psize, FALSE, FALSE );
84 nr_arena_item_invoke_render(NULL, root, &ua, &B,
85 NR_ARENA_ITEM_RENDER_NO_CACHE );
86 nr_pixblock_release(&B);
88 GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(px,
89 GDK_COLORSPACE_RGB,
90 TRUE,
91 8, psize, psize, psize * 4,
92 (GdkPixbufDestroyNotify)g_free,
93 NULL);
95 return pixbuf;
96 }
98 namespace Inkscape {
99 namespace UI {
100 namespace Cache {
102 SvgPreview::SvgPreview()
103 {
104 }
106 SvgPreview::~SvgPreview()
107 {
108 }
110 Glib::ustring SvgPreview::cache_key(gchar const *uri, gchar const *name, unsigned psize) const {
111 Glib::ustring key;
112 key += (uri!=NULL) ? uri : "";
113 key += ":";
114 key += (name!=NULL) ? name : "unknown";
115 key += ":";
116 key += psize;
117 return key;
118 }
120 GdkPixbuf* SvgPreview::get_preview_from_cache(const Glib::ustring& key) {
121 std::map<Glib::ustring, GdkPixbuf *>::iterator found = _pixmap_cache.find(key);
122 if ( found != _pixmap_cache.end() ) {
123 return found->second;
124 }
125 return NULL;
126 }
128 void SvgPreview::set_preview_in_cache(const Glib::ustring& key, GdkPixbuf* px) {
129 _pixmap_cache[key] = px;
130 }
132 GdkPixbuf* SvgPreview::get_preview(const gchar* uri, const gchar* id, NRArenaItem */*root*/,
133 double /*scale_factor*/, unsigned int psize) {
134 // First try looking up the cached preview in the cache map
135 Glib::ustring key = cache_key(uri, id, psize);
136 GdkPixbuf* px = get_preview_from_cache(key);
138 if (px == NULL) {
139 /*
140 px = render_pixbuf(root, scale_factor, dbox, psize);
141 set_preview_in_cache(key, px);
142 */
143 }
144 return px;
145 }
147 };
148 };
149 };