1 files changed, 78 insertions, 0 deletions
diff --git a/src/ui/cache/svg_preview_cache.h b/src/ui/cache/svg_preview_cache.h
new file mode 100644
index 000000000..7b802fee3
--- /dev/null
+++ b/src/ui/cache/svg_preview_cache.h
@@ -0,0 +1,78 @@
+/** \file
+ * SPIcon: Generic icon widget
+ */
+/*
+ * Copyright (C) 2007 Bryce W. Harrington <bryce@bryceharrington.org>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ *
+ */
+
+GdkPixbuf* get_pixbuf(GdkPixbuf* pixbuf) {
+    return pixbuf;
+}
+
+GdkPixbuf* render_pixbuf(NRArenaItem* root, double scale_factor, const NR::Rect& dbox, unsigned psize) {
+    NRGC gc(NULL);
+    NRMatrix t;
+
+    nr_matrix_set_scale(&t, scale_factor, scale_factor);
+    nr_arena_item_set_transform(root, &t);
+
+    nr_matrix_set_identity(&gc.transform);
+    nr_arena_item_invoke_update( root, NULL, &gc,
+                                 NR_ARENA_ITEM_STATE_ALL,
+                                 NR_ARENA_ITEM_STATE_NONE );
+
+    /* Item integer bbox in points */
+    NRRectL ibox;
+    ibox.x0 = (int) floor(scale_factor * dbox.min()[NR::X] + 0.5);
+    ibox.y0 = (int) floor(scale_factor * dbox.min()[NR::Y] + 0.5);
+    ibox.x1 = (int) floor(scale_factor * dbox.max()[NR::X] + 0.5);
+    ibox.y1 = (int) floor(scale_factor * dbox.max()[NR::Y] + 0.5);
+
+    /* Find visible area */
+    int width = ibox.x1 - ibox.x0;
+    int height = ibox.y1 - ibox.y0;
+    int dx = psize;
+    int dy = psize;
+    dx = (dx - width)/2; // watch out for size, since 'unsigned'-'signed' can cause problems if the result is negative
+    dy = (dy - height)/2;
+
+    NRRectL area;
+    area.x0 = ibox.x0 - dx;
+    area.y0 = ibox.y0 - dy;
+    area.x1 = area.x0 + psize;
+    area.y1 = area.y0 + psize;
+
+    /* Actual renderable area */
+    NRRectL ua;
+    ua.x0 = std::max(ibox.x0, area.x0);
+    ua.y0 = std::max(ibox.y0, area.y0);
+    ua.x1 = std::min(ibox.x1, area.x1);
+    ua.y1 = std::min(ibox.y1, area.y1);
+
+    /* Set up pixblock */
+    guchar *px = g_new(guchar, 4 * psize * psize);
+    memset(px, 0x00, 4 * psize * psize);
+
+    /* Render */
+    NRPixBlock B;
+    nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
+                              ua.x0, ua.y0, ua.x1, ua.y1,
+                              px + 4 * psize * (ua.y0 - area.y0) +
+                              4 * (ua.x0 - area.x0),
+                              4 * psize, FALSE, FALSE );
+    nr_arena_item_invoke_render( root, &ua, &B,
+                                 NR_ARENA_ITEM_RENDER_NO_CACHE );
+    nr_pixblock_release(&B);
+
+    GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(px,
+                                      GDK_COLORSPACE_RGB,
+                                      TRUE,
+                                      8, psize, psize, psize * 4,
+                                      (GdkPixbufDestroyNotify)g_free,
+                                      NULL);
+
+    return pixbuf;
+}