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gdk: Track wether windows have alpha in the background

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This will let us handle such windows differently in the
drawing machinery
This commit is contained in:
Alexander Larsson 2011-12-01 13:57:27 +01:00
parent 30ad4e676f
commit f51482e283
2 changed files with 52 additions and 0 deletions
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1
gdk/gdkinternals.h
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@ -204,6 +204,7 @@ struct _GdkWindow
guint input_only : 1;
guint modal_hint : 1;
guint composited : 1;
guint has_alpha_background : 1;
guint destroyed : 2;

51
gdk/gdkwindow.c
View File

@ -6476,6 +6476,9 @@ void
gdk_window_set_background_pattern (GdkWindow *window,
cairo_pattern_t *pattern)
{
gboolean has_alpha;
cairo_pattern_type_t type;
g_return_if_fail (GDK_IS_WINDOW (window));
if (window->input_only)
@ -6487,6 +6490,54 @@ gdk_window_set_background_pattern (GdkWindow *window,
cairo_pattern_destroy (window->background);
window->background = pattern;
has_alpha = TRUE;
type = cairo_pattern_get_type (pattern);
if (type == CAIRO_PATTERN_TYPE_SOLID)
{
double alpha;
cairo_pattern_get_rgba (pattern, NULL, NULL, NULL, &alpha);
if (alpha == 1.0)
has_alpha = FALSE;
}
else if (type == CAIRO_PATTERN_TYPE_LINEAR ||
type == CAIRO_PATTERN_TYPE_RADIAL)
{
int i, n;
double alpha;
n = 0;
cairo_pattern_get_color_stop_count (pattern, &n);
has_alpha = FALSE;
for (i = 0; i < n; i++)
{
cairo_pattern_get_color_stop_rgba (pattern, i, NULL,
NULL, NULL, NULL, &alpha);
if (alpha != 1.0)
{
has_alpha = TRUE;
break;
}
}
}
else if (type == CAIRO_PATTERN_TYPE_SURFACE)
{
cairo_surface_t *surface;
cairo_content_t content;
cairo_pattern_get_surface (pattern, &surface);
content = cairo_surface_get_content (surface);
has_alpha =
(content == CAIRO_CONTENT_ALPHA) ||
(content == CAIRO_CONTENT_COLOR_ALPHA);
}
if (has_alpha != window->has_alpha_background)
{
window->has_alpha_background = has_alpha;
recompute_visible_regions (window, TRUE, FALSE);
}
if (gdk_window_has_impl (window))
{
GdkWindowImplClass *impl_class = GDK_WINDOW_IMPL_GET_CLASS (window->impl);