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StThemeNodeDrawing: clip background image to node allocation

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When drawing the background image, we need to make sure
we don't draw outside the bounding rectangle of the node.

https://bugzilla.gnome.org/show_bug.cgi?id=636976
This commit is contained in:
Ray Strode 2011-01-13 17:46:59 -05:00
parent 260ca64e94
commit 06cea89dae
1 changed files with 28 additions and 1 deletions
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29
src/st/st-theme-node-drawing.c
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@ -773,8 +773,35 @@ st_theme_node_render_resources (StThemeNode *node,
if (background_image != NULL)
{
CoglHandle texture;
texture = st_texture_cache_load_file_to_cogl_texture (texture_cache, background_image);
/* If no background position is specified, then we will automatically scale
* the background to fit within the node allocation. But, if a background
* position is specified, we won't scale the background, and it could
* potentially leak out of bounds. To prevent that, we subtexture from the
* in bounds area when necessary.
*/
if (node->background_position_set &&
(cogl_texture_get_width (texture) > width ||
cogl_texture_get_height (texture) > height))
{
CoglHandle subtexture;
subtexture = cogl_texture_new_from_sub_texture (texture,
0, 0,
width - node->background_position_x,
height - node->background_position_y);
cogl_handle_unref (texture);
node->background_texture = subtexture;
}
else
{
node->background_texture = texture;
}
node->background_texture = st_texture_cache_load_file_to_cogl_texture (texture_cache, background_image);
node->background_material = _st_create_texture_material (node->background_texture);
if (background_image_shadow_spec)