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gdk: Expose bottommost windows first

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This cleans up the expose handling a bit by using the existing
clip regions, and it allows us later to use painters algorithm
to do transparent windows.
This commit is contained in:
Alexander Larsson 2011-12-01 13:42:09 +01:00
parent 45df163e9d
commit 7fd225c766
1 changed files with 41 additions and 55 deletions
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96
gdk/gdkwindow.c
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@ -3765,8 +3765,7 @@ _gdk_window_process_updates_recurse (GdkWindow *window,
cairo_region_t *expose_region)
{
GdkWindow *child;
cairo_region_t *child_region;
GdkRectangle r;
cairo_region_t *clipped_expose_region;
GList *l, *children;
if (cairo_region_is_empty (expose_region))
@ -3776,57 +3775,13 @@ _gdk_window_process_updates_recurse (GdkWindow *window,
window == window->impl_window)
_gdk_window_add_damage ((GdkWindow *) window->impl_window, expose_region);
/* Make this reentrancy safe for expose handlers freeing windows */
children = g_list_copy (window->children);
g_list_foreach (children, (GFunc)g_object_ref, NULL);
/* Iterate over children, starting at topmost */
for (l = children; l != NULL; l = l->next)
{
child = l->data;
/* Paint the window before the children, clipped to the window region
with visible child windows removed */
clipped_expose_region = cairo_region_copy (expose_region);
cairo_region_intersect (clipped_expose_region, window->clip_region_with_children);
if (child->destroyed || !GDK_WINDOW_IS_MAPPED (child) || child->input_only || child->composited)
continue;
/* Ignore offscreen children, as they don't draw in their parent and
* don't take part in the clipping */
if (gdk_window_is_offscreen (child))
continue;
r.x = child->x;
r.y = child->y;
r.width = child->width;
r.height = child->height;
child_region = cairo_region_create_rectangle (&r);
if (child->shape)
{
/* Adjust shape region to parent window coords */
cairo_region_translate (child->shape, child->x, child->y);
cairo_region_intersect (child_region, child->shape);
cairo_region_translate (child->shape, -child->x, -child->y);
}
if (child->impl == window->impl)
{
/* Client side child, expose */
cairo_region_intersect (child_region, expose_region);
cairo_region_subtract (expose_region, child_region);
cairo_region_translate (child_region, -child->x, -child->y);
_gdk_window_process_updates_recurse ((GdkWindow *)child, child_region);
}
else
{
/* Native child, just remove area from expose region */
cairo_region_subtract (expose_region, child_region);
}
cairo_region_destroy (child_region);
}
g_list_foreach (children, (GFunc)g_object_unref, NULL);
g_list_free (children);
if (!cairo_region_is_empty (expose_region) &&
if (!cairo_region_is_empty (clipped_expose_region) &&
!window->destroyed)
{
if (window->event_mask & GDK_EXPOSURE_MASK)
@ -3837,8 +3792,8 @@ _gdk_window_process_updates_recurse (GdkWindow *window,
event.expose.window = g_object_ref (window);
event.expose.send_event = FALSE;
event.expose.count = 0;
event.expose.region = expose_region;
cairo_region_get_extents (expose_region, &event.expose.area);
event.expose.region = clipped_expose_region;
cairo_region_get_extents (clipped_expose_region, &event.expose.area);
_gdk_event_emit (&event);
@ -3857,11 +3812,42 @@ _gdk_window_process_updates_recurse (GdkWindow *window,
* We use begin/end_paint around the clear so that we can
* piggyback on the implicit paint */
gdk_window_begin_paint_region (window, expose_region);
gdk_window_clear_region_internal (window, expose_region);
gdk_window_begin_paint_region (window, clipped_expose_region);
gdk_window_clear_region_internal (window, clipped_expose_region);
gdk_window_end_paint (window);
}
}
cairo_region_destroy (clipped_expose_region);
/* Make this reentrancy safe for expose handlers freeing windows */
children = g_list_copy (window->children);
g_list_foreach (children, (GFunc)g_object_ref, NULL);
/* Iterate over children, starting at bottommost */
for (l = g_list_last (children); l != NULL; l = l->prev)
{
child = l->data;
if (child->destroyed || !GDK_WINDOW_IS_MAPPED (child) || child->input_only || child->composited)
continue;
/* Ignore offscreen children, as they don't draw in their parent and
* don't take part in the clipping */
if (gdk_window_is_offscreen (child))
continue;
/* Client side child, expose */
if (child->impl == window->impl)
{
cairo_region_translate (expose_region, -child->x, -child->y);
_gdk_window_process_updates_recurse ((GdkWindow *)child, expose_region);
cairo_region_translate (expose_region, child->x, child->y);
}
}
g_list_foreach (children, (GFunc)g_object_unref, NULL);
g_list_free (children);
}
/* Process and remove any invalid area on the native window by creating