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Handle has_alpha_background for parent-relative backgrounds

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This commit is contained in:
Alexander Larsson 2011-12-05 10:55:55 +01:00
parent 7a263c68a0
commit f00cfe1fac
1 changed files with 86 additions and 35 deletions
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121
gdk/gdkwindow.c
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@ -255,6 +255,7 @@ static void gdk_window_invalidate_rect_full (GdkWindow *window,
const GdkRectangle *rect,
gboolean invalidate_children,
ClearBg clear_bg);
static void _gdk_window_propagate_has_alpha_background (GdkWindow *window);
static guint signals[LAST_SIGNAL] = { 0 };
@ -1637,10 +1638,22 @@ gdk_window_reparent (GdkWindow *window,
_gdk_window_update_viewable (window);
if (window->background == NULL)
{
/* parent relative background, update has_alpha_background */
if (window->parent == NULL ||
window->parent->window_type == GDK_WINDOW_ROOT)
window->has_alpha_background = FALSE;
else
window->has_alpha_background = window->parent->has_alpha_background;
}
recompute_visible_regions (window, TRUE, FALSE);
if (old_parent && GDK_WINDOW_TYPE (old_parent) != GDK_WINDOW_ROOT)
recompute_visible_regions (old_parent, FALSE, TRUE);
_gdk_window_propagate_has_alpha_background (window);
/* We used to apply the clip as the shape, but no more.
Reset this to the real shape */
if (gdk_window_has_impl (window) &&
@ -6491,6 +6504,29 @@ gdk_window_set_background_rgba (GdkWindow *window,
cairo_pattern_destroy (pattern);
}
/* Updates has_alpha_background recursively for all child windows
that have parent-relative alpha */
static void
_gdk_window_propagate_has_alpha_background (GdkWindow *window)
{
GdkWindow *child;
GList *l;
for (l = window->children; l; l = l->next)
{
child = l->data;
if (child->background == NULL &&
child->has_alpha_background != window->has_alpha_background)
{
child->has_alpha_background = window->has_alpha_background;
recompute_visible_regions (child, TRUE, FALSE);
_gdk_window_propagate_has_alpha_background (child);
}
}
}
/**
* gdk_window_set_background_pattern:
* @window: a #GdkWindow
@ -6523,53 +6559,68 @@ gdk_window_set_background_pattern (GdkWindow *window,
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++)
if (pattern == NULL)
{
/* parent-relative, copy has_alpha from parent */
if (window->parent == NULL ||
window->parent->window_type == GDK_WINDOW_ROOT)
has_alpha = FALSE;
else
has_alpha = window->parent->has_alpha_background;
}
else
{
type = cairo_pattern_get_type (pattern);
if (type == CAIRO_PATTERN_TYPE_SOLID)
{
cairo_pattern_get_color_stop_rgba (pattern, i, NULL,
NULL, NULL, NULL, &alpha);
if (alpha != 1.0)
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++)
{
has_alpha = TRUE;
break;
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;
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);
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);
_gdk_window_propagate_has_alpha_background (window);
}
if (gdk_window_has_impl (window))
{
GdkWindowImplClass *impl_class = GDK_WINDOW_IMPL_GET_CLASS (window->impl);