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gtk/gdk/gdkwindow.c
Matthias Clasen 5175386051 Add some more detail to the docs. (#311399, Nikos Kouremenos) 
2006-07-17  Matthias Clasen  <mclasen@redhat.com>

	* gdk/gdkwindow.c (gdk_window_get_pointer): Add some more
	detail to the docs.  (#311399, Nikos Kouremenos)
2006-07-17 04:19:59 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <config.h>
#include "gdkwindow.h"
#include "gdkinternals.h"
#include "gdk.h" /* For gdk_rectangle_union() */
#include "gdkpixmap.h"
#include "gdkdrawable.h"
#include "gdkpixmap.h"
#include "gdkscreen.h"
#include "gdkalias.h"
#define USE_BACKING_STORE /* Appears to work on Win32, too, now. */
typedef struct _GdkWindowPaint GdkWindowPaint;
struct _GdkWindowPaint
{
GdkRegion *region;
GdkPixmap *pixmap;
gint x_offset;
gint y_offset;
cairo_surface_t *surface;
};
static GdkGC *gdk_window_create_gc (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask mask);
static void gdk_window_draw_rectangle (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
gint x,
gint y,
gint width,
gint height);
static void gdk_window_draw_arc (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
gint x,
gint y,
gint width,
gint height,
gint angle1,
gint angle2);
static void gdk_window_draw_polygon (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
GdkPoint *points,
gint npoints);
static void gdk_window_draw_text (GdkDrawable *drawable,
GdkFont *font,
GdkGC *gc,
gint x,
gint y,
const gchar *text,
gint text_length);
static void gdk_window_draw_text_wc (GdkDrawable *drawable,
GdkFont *font,
GdkGC *gc,
gint x,
gint y,
const GdkWChar *text,
gint text_length);
static void gdk_window_draw_drawable (GdkDrawable *drawable,
GdkGC *gc,
GdkPixmap *src,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height);
static void gdk_window_draw_points (GdkDrawable *drawable,
GdkGC *gc,
GdkPoint *points,
gint npoints);
static void gdk_window_draw_segments (GdkDrawable *drawable,
GdkGC *gc,
GdkSegment *segs,
gint nsegs);
static void gdk_window_draw_lines (GdkDrawable *drawable,
GdkGC *gc,
GdkPoint *points,
gint npoints);
static void gdk_window_draw_glyphs (GdkDrawable *drawable,
GdkGC *gc,
PangoFont *font,
gint x,
gint y,
PangoGlyphString *glyphs);
static void gdk_window_draw_glyphs_transformed (GdkDrawable *drawable,
GdkGC *gc,
PangoMatrix *matrix,
PangoFont *font,
gint x,
gint y,
PangoGlyphString *glyphs);
static void gdk_window_draw_image (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height);
static void gdk_window_draw_pixbuf (GdkDrawable *drawable,
GdkGC *gc,
GdkPixbuf *pixbuf,
gint src_x,
gint src_y,
gint dest_x,
gint dest_y,
gint width,
gint height,
GdkRgbDither dither,
gint x_dither,
gint y_dither);
static void gdk_window_draw_trapezoids (GdkDrawable *drawable,
GdkGC *gc,
GdkTrapezoid *trapezoids,
gint n_trapezoids);
static GdkImage* gdk_window_copy_to_image (GdkDrawable *drawable,
GdkImage *image,
gint src_x,
gint src_y,
gint dest_x,
gint dest_y,
gint width,
gint height);
static cairo_surface_t *gdk_window_ref_cairo_surface (GdkDrawable *drawable);
static void gdk_window_real_get_size (GdkDrawable *drawable,
gint *width,
gint *height);
static GdkVisual* gdk_window_real_get_visual (GdkDrawable *drawable);
static gint gdk_window_real_get_depth (GdkDrawable *drawable);
static GdkScreen* gdk_window_real_get_screen (GdkDrawable *drawable);
static void gdk_window_real_set_colormap (GdkDrawable *drawable,
GdkColormap *cmap);
static GdkColormap* gdk_window_real_get_colormap (GdkDrawable *drawable);
static GdkDrawable* gdk_window_get_composite_drawable (GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height,
gint *composite_x_offset,
gint *composite_y_offset);
static GdkRegion* gdk_window_get_clip_region (GdkDrawable *drawable);
static GdkRegion* gdk_window_get_visible_region (GdkDrawable *drawable);
static void gdk_window_free_paint_stack (GdkWindow *window);
static void gdk_window_init (GdkWindowObject *window);
static void gdk_window_class_init (GdkWindowObjectClass *klass);
static void gdk_window_finalize (GObject *object);
static void gdk_window_clear_backing_rect (GdkWindow *window,
gint x,
gint y,
gint width,
gint height);
static gpointer parent_class = NULL;
GType
gdk_window_object_get_type (void)
{
static GType object_type = 0;
if (!object_type)
object_type = g_type_register_static_simple (GDK_TYPE_DRAWABLE,
"GdkWindow",
sizeof (GdkWindowObjectClass),
(GClassInitFunc) gdk_window_class_init,
sizeof (GdkWindowObject),
(GInstanceInitFunc) gdk_window_init,
0);
return object_type;
}
GType
_gdk_paintable_get_type (void)
{
static GType paintable_type = 0;
if (!paintable_type)
{
static const GTypeInfo paintable_info =
{
sizeof (GdkPaintableIface), /* class_size */
NULL, /* base_init */
NULL, /* base_finalize */
};
paintable_type = g_type_register_static (G_TYPE_INTERFACE,
g_intern_static_string ("GdkPaintable"),
&paintable_info, 0);
g_type_interface_add_prerequisite (paintable_type, G_TYPE_OBJECT);
}
return paintable_type;
}
static void
gdk_window_init (GdkWindowObject *window)
{
/* 0-initialization is good for all other fields. */
window->window_type = GDK_WINDOW_CHILD;
window->state = GDK_WINDOW_STATE_WITHDRAWN;
window->impl = g_object_new (_gdk_window_impl_get_type (), NULL);
}
static void
gdk_window_class_init (GdkWindowObjectClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkDrawableClass *drawable_class = GDK_DRAWABLE_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gdk_window_finalize;
drawable_class->create_gc = gdk_window_create_gc;
drawable_class->draw_rectangle = gdk_window_draw_rectangle;
drawable_class->draw_arc = gdk_window_draw_arc;
drawable_class->draw_polygon = gdk_window_draw_polygon;
drawable_class->draw_text = gdk_window_draw_text;
drawable_class->draw_text_wc = gdk_window_draw_text_wc;
drawable_class->draw_drawable = gdk_window_draw_drawable;
drawable_class->draw_points = gdk_window_draw_points;
drawable_class->draw_segments = gdk_window_draw_segments;
drawable_class->draw_lines = gdk_window_draw_lines;
drawable_class->draw_glyphs = gdk_window_draw_glyphs;
drawable_class->draw_glyphs_transformed = gdk_window_draw_glyphs_transformed;
drawable_class->draw_image = gdk_window_draw_image;
drawable_class->draw_pixbuf = gdk_window_draw_pixbuf;
drawable_class->draw_trapezoids = gdk_window_draw_trapezoids;
drawable_class->get_depth = gdk_window_real_get_depth;
drawable_class->get_screen = gdk_window_real_get_screen;
drawable_class->get_size = gdk_window_real_get_size;
drawable_class->set_colormap = gdk_window_real_set_colormap;
drawable_class->get_colormap = gdk_window_real_get_colormap;
drawable_class->get_visual = gdk_window_real_get_visual;
drawable_class->_copy_to_image = gdk_window_copy_to_image;
drawable_class->ref_cairo_surface = gdk_window_ref_cairo_surface;
drawable_class->get_clip_region = gdk_window_get_clip_region;
drawable_class->get_visible_region = gdk_window_get_visible_region;
drawable_class->get_composite_drawable = gdk_window_get_composite_drawable;
}
static void
gdk_window_finalize (GObject *object)
{
GdkWindow *window = GDK_WINDOW (object);
GdkWindowObject *obj = (GdkWindowObject *) object;
if (!GDK_WINDOW_DESTROYED (window))
{
if (GDK_WINDOW_TYPE (window) != GDK_WINDOW_FOREIGN)
{
g_warning ("losing last reference to undestroyed window\n");
_gdk_window_destroy (window, FALSE);
}
else
/* We use TRUE here, to keep us from actually calling
* XDestroyWindow() on the window
*/
_gdk_window_destroy (window, TRUE);
}
g_object_unref (obj->impl);
obj->impl = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
window_remove_filters (GdkWindow *window)
{
GdkWindowObject *obj = (GdkWindowObject*) window;
if (obj->filters)
{
GList *tmp_list;
for (tmp_list = obj->filters; tmp_list; tmp_list = tmp_list->next)
g_free (tmp_list->data);
g_list_free (obj->filters);
obj->filters = NULL;
}
}
/**
* _gdk_window_destroy_hierarchy:
* @window: a #GdkWindow
* @recursing: If TRUE, then this is being called because a parent
* was destroyed. This generally means that the call to the
* windowing system to destroy the window can be omitted, since
* it will be destroyed as a result of the parent being destroyed.
* Unless @foreign_destroy.
* @foreign_destroy: If TRUE, the window or a parent was destroyed by some
* external agency. The window has already been destroyed and no
* windowing system calls should be made. (This may never happen
* for some windowing systems.)
*
* Internal function to destroy a window. Like gdk_window_destroy(),
* but does not drop the reference count created by gdk_window_new().
**/
static void
_gdk_window_destroy_hierarchy (GdkWindow *window,
gboolean recursing,
gboolean foreign_destroy)
{
GdkWindowObject *private;
GdkWindowObject *temp_private;
GdkWindow *temp_window;
GdkScreen *screen;
GList *children;
GList *tmp;
g_return_if_fail (window != NULL);
private = (GdkWindowObject*) window;
if (GDK_WINDOW_DESTROYED (window))
return;
switch (GDK_WINDOW_TYPE (window))
{
case GDK_WINDOW_ROOT:
screen = gdk_drawable_get_screen (GDK_DRAWABLE (window));
if (!screen->closed)
{
g_error ("attempted to destroy root window");
break;
}
/* else fall thru */
case GDK_WINDOW_TOPLEVEL:
case GDK_WINDOW_CHILD:
case GDK_WINDOW_DIALOG:
case GDK_WINDOW_TEMP:
case GDK_WINDOW_FOREIGN:
if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_FOREIGN && !foreign_destroy)
{
/* Logically, it probably makes more sense to send
* a "destroy yourself" message to the foreign window
* whether or not it's in our heirarchy; but for historical
* reasons, we only send "destroy yourself" messages to
* foreign windows in our heirarchy.
*/
if (private->parent)
_gdk_windowing_window_destroy_foreign (window);
/* Also for historical reasons, we remove any filters
* on a foreign window when it or a parent is destroyed;
* this likely causes problems if two separate portions
* of code are maintaining filter lists on a foreign window.
*/
window_remove_filters (window);
}
else
{
private->state |= GDK_WINDOW_STATE_WITHDRAWN;
if (private->parent)
{
GdkWindowObject *parent_private = (GdkWindowObject *)private->parent;
if (parent_private->children)
parent_private->children = g_list_remove (parent_private->children, window);
}
_gdk_window_clear_update_area (window);
gdk_window_free_paint_stack (window);
if (private->bg_pixmap &&
private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
private->bg_pixmap != GDK_NO_BG)
{
g_object_unref (private->bg_pixmap);
private->bg_pixmap = NULL;
}
if (GDK_WINDOW_TYPE (window) == GDK_WINDOW_FOREIGN)
g_assert (private->children == NULL);
else
{
children = tmp = private->children;
private->children = NULL;
while (tmp)
{
temp_window = tmp->data;
tmp = tmp->next;
temp_private = (GdkWindowObject*) temp_window;
if (temp_private)
_gdk_window_destroy_hierarchy (temp_window,
TRUE, foreign_destroy);
}
g_list_free (children);
}
_gdk_windowing_window_destroy (window, recursing, foreign_destroy);
private->parent = NULL;
private->destroyed = TRUE;
window_remove_filters (window);
gdk_drawable_set_colormap (GDK_DRAWABLE (window), NULL);
}
break;
}
}
/**
* _gdk_window_destroy:
* @window: a #GdkWindow
* @foreign_destroy: If TRUE, the window or a parent was destroyed by some
* external agency. The window has already been destroyed and no
* windowing system calls should be made. (This may never happen
* for some windowing systems.)
*
* Internal function to destroy a window. Like gdk_window_destroy(),
* but does not drop the reference count created by gdk_window_new().
**/
void
_gdk_window_destroy (GdkWindow *window,
gboolean foreign_destroy)
{
_gdk_window_destroy_hierarchy (window, FALSE, foreign_destroy);
}
/**
* gdk_window_destroy:
* @window: a #GdkWindow
*
* Destroys the window system resources associated with @window and decrements @window's
* reference count. The window system resources for all children of @window are also
* destroyed, but the children's reference counts are not decremented.
*
* Note that a window will not be destroyed automatically when its reference count
* reaches zero. You must call this function yourself before that happens.
*
**/
void
gdk_window_destroy (GdkWindow *window)
{
_gdk_window_destroy_hierarchy (window, FALSE, FALSE);
g_object_unref (window);
}
/**
* gdk_window_set_user_data:
* @window: a #GdkWindow
* @user_data: user data
*
* For most purposes this function is deprecated in favor of
* g_object_set_data(). However, for historical reasons GTK+ stores
* the #GtkWidget that owns a #GdkWindow as user data on the
* #GdkWindow. So, custom widget implementations should use
* this function for that. If GTK+ receives an event for a #GdkWindow,
* and the user data for the window is non-%NULL, GTK+ will assume the
* user data is a #GtkWidget, and forward the event to that widget.
*
**/
void
gdk_window_set_user_data (GdkWindow *window,
gpointer user_data)
{
g_return_if_fail (window != NULL);
((GdkWindowObject*)window)->user_data = user_data;
}
/**
* gdk_window_get_user_data:
* @window: a #GdkWindow
* @data: return location for user data
*
* Retrieves the user data for @window, which is normally the widget
* that @window belongs to. See gdk_window_set_user_data().
*
**/
void
gdk_window_get_user_data (GdkWindow *window,
gpointer *data)
{
g_return_if_fail (window != NULL);
*data = ((GdkWindowObject*)window)->user_data;
}
/**
* gdk_window_get_window_type:
* @window: a #GdkWindow
*
* Gets the type of the window. See #GdkWindowType.
*
* Return value: type of window
**/
GdkWindowType
gdk_window_get_window_type (GdkWindow *window)
{
g_return_val_if_fail (GDK_IS_WINDOW (window), (GdkWindowType) -1);
return GDK_WINDOW_TYPE (window);
}
/**
* gdk_window_get_position:
* @window: a #GdkWindow
* @x: X coordinate of window
* @y: Y coordinate of window
*
* Obtains the position of the window as reported in the
* most-recently-processed #GdkEventConfigure. Contrast with
* gdk_window_get_geometry() which queries the X server for the
* current window position, regardless of which events have been
* received or processed.
*
* The position coordinates are relative to the window's parent window.
*
**/
void
gdk_window_get_position (GdkWindow *window,
gint *x,
gint *y)
{
GdkWindowObject *obj;
g_return_if_fail (GDK_IS_WINDOW (window));
obj = (GdkWindowObject*) window;
if (x)
*x = obj->x;
if (y)
*y = obj->y;
}
/**
* gdk_window_get_parent:
* @window: a #GdkWindow
*
* Obtains the parent of @window, as known to GDK. Does not query the
* X server; thus this returns the parent as passed to gdk_window_new(),
* not the actual parent. This should never matter unless you're using
* Xlib calls mixed with GDK calls on the X11 platform. It may also
* matter for toplevel windows, because the window manager may choose
* to reparent them.
*
* Return value: parent of @window
**/
GdkWindow*
gdk_window_get_parent (GdkWindow *window)
{
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
return (GdkWindow*) ((GdkWindowObject*) window)->parent;
}
/**
* gdk_window_get_toplevel:
* @window: a #GdkWindow
*
* Gets the toplevel window that's an ancestor of @window.
*
* Return value: the toplevel window containing @window
**/
GdkWindow*
gdk_window_get_toplevel (GdkWindow *window)
{
GdkWindowObject *obj;
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
obj = (GdkWindowObject *)window;
while (GDK_WINDOW_TYPE (obj) == GDK_WINDOW_CHILD)
obj = (GdkWindowObject *)obj->parent;
return GDK_WINDOW (obj);
}
/**
* gdk_window_get_children:
* @window: a #GdkWindow
*
* Gets the list of children of @window known to GDK.
* This function only returns children created via GDK,
* so for example it's useless when used with the root window;
* it only returns windows an application created itself.
*
* The returned list must be freed, but the elements in the
* list need not be.
*
* Return value: list of child windows inside @window
**/
GList*
gdk_window_get_children (GdkWindow *window)
{
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
if (GDK_WINDOW_DESTROYED (window))
return NULL;
return g_list_copy (GDK_WINDOW_OBJECT (window)->children);
}
/**
* gdk_window_peek_children:
* @window: a #GdkWindow
*
* Like gdk_window_get_children(), but does not copy the list of
* children, so the list does not need to be freed.
*
* Return value: a reference to the list of child windows in @window
**/
GList *
gdk_window_peek_children (GdkWindow *window)
{
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
if (GDK_WINDOW_DESTROYED (window))
return NULL;
return GDK_WINDOW_OBJECT (window)->children;
}
/**
* gdk_window_add_filter:
* @window: a #GdkWindow
* @function: filter callback
* @data: data to pass to filter callback
*
* Adds an event filter to @window, allowing you to intercept events
* before they reach GDK. This is a low-level operation and makes it
* easy to break GDK and/or GTK+, so you have to know what you're
* doing. Pass %NULL for @window to get all events for all windows,
* instead of events for a specific window.
*
**/
void
gdk_window_add_filter (GdkWindow *window,
GdkFilterFunc function,
gpointer data)
{
GdkWindowObject *private;
GList *tmp_list;
GdkEventFilter *filter;
g_return_if_fail (window == NULL || GDK_IS_WINDOW (window));
private = (GdkWindowObject*) window;
if (private && GDK_WINDOW_DESTROYED (window))
return;
if (private)
tmp_list = private->filters;
else
tmp_list = _gdk_default_filters;
while (tmp_list)
{
filter = (GdkEventFilter *)tmp_list->data;
if ((filter->function == function) && (filter->data == data))
return;
tmp_list = tmp_list->next;
}
filter = g_new (GdkEventFilter, 1);
filter->function = function;
filter->data = data;
if (private)
private->filters = g_list_append (private->filters, filter);
else
_gdk_default_filters = g_list_append (_gdk_default_filters, filter);
}
/**
* gdk_window_remove_filter:
* @window: a #GdkWindow
* @function: previously-added filter function
* @data: user data for previously-added filter function
*
* Remove a filter previously added with gdk_window_add_filter().
*
**/
void
gdk_window_remove_filter (GdkWindow *window,
GdkFilterFunc function,
gpointer data)
{
GdkWindowObject *private;
GList *tmp_list, *node;
GdkEventFilter *filter;
g_return_if_fail (window == NULL || GDK_IS_WINDOW (window));
private = (GdkWindowObject*) window;
if (private)
tmp_list = private->filters;
else
tmp_list = _gdk_default_filters;
while (tmp_list)
{
filter = (GdkEventFilter *)tmp_list->data;
node = tmp_list;
tmp_list = tmp_list->next;
if ((filter->function == function) && (filter->data == data))
{
if (private)
private->filters = g_list_remove_link (private->filters, node);
else
_gdk_default_filters = g_list_remove_link (_gdk_default_filters, node);
g_list_free_1 (node);
g_free (filter);
return;
}
}
}
/**
* gdk_screen_get_toplevel_windows:
* @screen: The #GdkScreen where the toplevels are located.
*
* Obtains a list of all toplevel windows known to GDK on the screen @screen.
* A toplevel window is a child of the root window (see
* gdk_get_default_root_window()).
*
* The returned list should be freed with g_list_free(), but
* its elements need not be freed.
*
* Return value: list of toplevel windows, free with g_list_free()
*
* Since: 2.2
**/
GList *
gdk_screen_get_toplevel_windows (GdkScreen *screen)
{
GdkWindow * root_window;
GList *new_list = NULL;
GList *tmp_list;
g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
root_window = gdk_screen_get_root_window (screen);
tmp_list = ((GdkWindowObject *)root_window)->children;
while (tmp_list)
{
if (GDK_WINDOW_TYPE (tmp_list->data) != GDK_WINDOW_FOREIGN)
new_list = g_list_prepend (new_list, tmp_list->data);
tmp_list = tmp_list->next;
}
return new_list;
}
/**
* gdk_window_get_toplevels:
*
* Obtains a list of all toplevel windows known to GDK on the default
* screen (see gdk_screen_get_toplevel_windows()).
* A toplevel window is a child of the root window (see
* gdk_get_default_root_window()).
*
* The returned list should be freed with g_list_free(), but
* its elements need not be freed.
*
* Return value: list of toplevel windows, free with g_list_free()
**/
GList *
gdk_window_get_toplevels (void)
{
return gdk_screen_get_toplevel_windows (gdk_screen_get_default ());
}
/**
* gdk_window_is_visible:
* @window: a #GdkWindow
*
* Checks whether the window has been mapped (with gdk_window_show() or
* gdk_window_show_unraised()).
*
* Return value: %TRUE if the window is mapped
**/
gboolean
gdk_window_is_visible (GdkWindow *window)
{
g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
return GDK_WINDOW_IS_MAPPED (window);
}
/**
* gdk_window_is_viewable:
* @window: a #GdkWindow
*
* Check if the window and all ancestors of the window are
* mapped. (This is not necessarily "viewable" in the X sense, since
* we only check as far as we have GDK window parents, not to the root
* window.)
*
* Return value: %TRUE if the window is viewable
**/
gboolean
gdk_window_is_viewable (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
GdkScreen *screen;
GdkWindow *root_window;
g_return_val_if_fail (window != NULL, FALSE);
g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
screen = gdk_drawable_get_screen (window);
root_window = gdk_screen_get_root_window (screen);
while (private &&
(private != (GdkWindowObject *)root_window) &&
(GDK_WINDOW_TYPE (private) != GDK_WINDOW_FOREIGN))
{
if (GDK_WINDOW_DESTROYED (private) || !GDK_WINDOW_IS_MAPPED (private))
return FALSE;
private = (GdkWindowObject *)private->parent;
}
return TRUE;
}
/**
* gdk_window_get_state:
* @window: a #GdkWindow
*
* Gets the bitwise OR of the currently active window state flags,
* from the #GdkWindowState enumeration.
*
* Return value: window state bitfield
**/
GdkWindowState
gdk_window_get_state (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
return private->state;
}
/**
* gdk_window_begin_paint_rect:
* @window: a #GdkWindow
* @rectangle: rectangle you intend to draw to
*
* A convenience wrapper around gdk_window_begin_paint_region() which
* creates a rectangular region for you. See
* gdk_window_begin_paint_region() for details.
*
**/
void
gdk_window_begin_paint_rect (GdkWindow *window,
GdkRectangle *rectangle)
{
GdkRegion *region;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
region = gdk_region_rectangle (rectangle);
gdk_window_begin_paint_region (window, region);
gdk_region_destroy (region);
}
#ifdef GDK_WINDOWING_X11
#include "x11/gdkx.h"
#endif
/**
* gdk_window_begin_paint_region:
* @window: a #GdkWindow
* @region: region you intend to draw to
*
* Indicates that you are beginning the process of redrawing @region.
* A backing store (offscreen buffer) large enough to contain @region
* will be created. The backing store will be initialized with the
* background color or background pixmap for @window. Then, all
* drawing operations performed on @window will be diverted to the
* backing store. When you call gdk_window_end_paint(), the backing
* store will be copied to @window, making it visible onscreen. Only
* the part of @window contained in @region will be modified; that is,
* drawing operations are clipped to @region.
*
* The net result of all this is to remove flicker, because the user
* sees the finished product appear all at once when you call
* gdk_window_end_paint(). If you draw to @window directly without
* calling gdk_window_begin_paint_region(), the user may see flicker
* as individual drawing operations are performed in sequence. The
* clipping and background-initializing features of
* gdk_window_begin_paint_region() are conveniences for the
* programmer, so you can avoid doing that work yourself.
*
* When using GTK+, the widget system automatically places calls to
* gdk_window_begin_paint_region() and gdk_window_end_paint() around
* emissions of the expose_event signal. That is, if you're writing an
* expose event handler, you can assume that the exposed area in
* #GdkEventExpose has already been cleared to the window background,
* is already set as the clip region, and already has a backing store.
* Therefore in most cases, application code need not call
* gdk_window_begin_paint_region(). (You can disable the automatic
* calls around expose events on a widget-by-widget basis by calling
* gtk_widget_set_double_buffered().)
*
* If you call this function multiple times before calling the
* matching gdk_window_end_paint(), the backing stores are pushed onto
* a stack. gdk_window_end_paint() copies the topmost backing store
* onscreen, subtracts the topmost region from all other regions in
* the stack, and pops the stack. All drawing operations affect only
* the topmost backing store in the stack. One matching call to
* gdk_window_end_paint() is required for each call to
* gdk_window_begin_paint_region().
*
**/
void
gdk_window_begin_paint_region (GdkWindow *window,
GdkRegion *region)
{
#ifdef USE_BACKING_STORE
GdkWindowObject *private = (GdkWindowObject *)window;
GdkRectangle clip_box;
GdkWindowPaint *paint;
GSList *list;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_WINDOW_DESTROYED (window))
return;
if (GDK_IS_PAINTABLE (private->impl) &&
GDK_PAINTABLE_GET_IFACE (private->impl)->begin_paint_region)
{
GDK_PAINTABLE_GET_IFACE (private->impl)->begin_paint_region (GDK_PAINTABLE (private->impl), region);
return;
}
gdk_region_get_clipbox (region, &clip_box);
paint = g_new (GdkWindowPaint, 1);
paint->region = gdk_region_copy (region);
paint->x_offset = clip_box.x;
paint->y_offset = clip_box.y;
paint->pixmap =
gdk_pixmap_new (window,
MAX (clip_box.width, 1), MAX (clip_box.height, 1), -1);
paint->surface = _gdk_drawable_ref_cairo_surface (paint->pixmap);
cairo_surface_set_device_offset (paint->surface,
- paint->x_offset, - paint->y_offset);
for (list = private->paint_stack; list != NULL; list = list->next)
{
GdkWindowPaint *tmp_paint = list->data;
gdk_region_subtract (tmp_paint->region, paint->region);
}
private->paint_stack = g_slist_prepend (private->paint_stack, paint);
if (!gdk_region_empty (region))
{
gdk_window_clear_backing_rect (window,
clip_box.x, clip_box.y,
clip_box.width, clip_box.height);
}
#endif /* USE_BACKING_STORE */
}
/**
* gdk_window_end_paint:
* @window: a #GdkWindow
*
* Indicates that the backing store created by the most recent call to
* gdk_window_begin_paint_region() should be copied onscreen and
* deleted, leaving the next-most-recent backing store or no backing
* store at all as the active paint region. See
* gdk_window_begin_paint_region() for full details. It is an error to
* call this function without a matching
* gdk_window_begin_paint_region() first.
*
**/
void
gdk_window_end_paint (GdkWindow *window)
{
#ifdef USE_BACKING_STORE
GdkWindowObject *private = (GdkWindowObject *)window;
GdkWindowPaint *paint;
GdkGC *tmp_gc;
GdkRectangle clip_box;
gint x_offset, y_offset;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_WINDOW_DESTROYED (window))
return;
if (GDK_IS_PAINTABLE (private->impl) &&
GDK_PAINTABLE_GET_IFACE (private->impl)->end_paint)
{
GDK_PAINTABLE_GET_IFACE (private->impl)->end_paint (GDK_PAINTABLE (private->impl));
return;
}
if (private->paint_stack == NULL)
{
g_warning (G_STRLOC": no preceding call to gdk_window_begin_paint_region(), see documentation");
return;
}
paint = private->paint_stack->data;
private->paint_stack = g_slist_delete_link (private->paint_stack,
private->paint_stack);
gdk_region_get_clipbox (paint->region, &clip_box);
tmp_gc = _gdk_drawable_get_scratch_gc (window, FALSE);
_gdk_windowing_window_get_offsets (window, &x_offset, &y_offset);
gdk_gc_set_clip_region (tmp_gc, paint->region);
gdk_gc_set_clip_origin (tmp_gc, - x_offset, - y_offset);
gdk_draw_drawable (private->impl, tmp_gc, paint->pixmap,
clip_box.x - paint->x_offset,
clip_box.y - paint->y_offset,
clip_box.x - x_offset, clip_box.y - y_offset,
clip_box.width, clip_box.height);
/* Reset clip region of the cached GdkGC */
gdk_gc_set_clip_region (tmp_gc, NULL);
cairo_surface_destroy (paint->surface);
g_object_unref (paint->pixmap);
gdk_region_destroy (paint->region);
g_free (paint);
#endif /* USE_BACKING_STORE */
}
static void
gdk_window_free_paint_stack (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
if (private->paint_stack)
{
GSList *tmp_list = private->paint_stack;
while (tmp_list)
{
GdkWindowPaint *paint = tmp_list->data;
if (tmp_list == private->paint_stack)
g_object_unref (paint->pixmap);
gdk_region_destroy (paint->region);
g_free (paint);
tmp_list = tmp_list->next;
}
g_slist_free (private->paint_stack);
private->paint_stack = NULL;
}
}
static void
gdk_window_get_offsets (GdkWindow *window,
gint *x_offset,
gint *y_offset)
{
GdkWindowObject *private = (GdkWindowObject *)window;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
*x_offset = paint->x_offset;
*y_offset = paint->y_offset;
}
else
_gdk_windowing_window_get_offsets (window, x_offset, y_offset);
}
/**
* gdk_window_get_internal_paint_info:
* @window: a #GdkWindow
* @real_drawable: location to store the drawable to which drawing should be
* done.
* @x_offset: location to store the X offset between coordinates in @window,
* and the underlying window system primitive coordinates for
* *@real_drawable.
* @y_offset: location to store the Y offset between coordinates in @window,
* and the underlying window system primitive coordinates for
* *@real_drawable.
*
* If you bypass the GDK layer and use windowing system primitives to
* draw directly onto a #GdkWindow, then you need to deal with two
* details: there may be an offset between GDK coordinates and windowing
* system coordinates, and GDK may have redirected drawing to a offscreen
* pixmap as the result of a gdk_window_begin_paint_region() calls.
* This function allows retrieving the information you need to compensate
* for these effects.
*
* This function exposes details of the GDK implementation, and is thus
* likely to change in future releases of GDK.
**/
void
gdk_window_get_internal_paint_info (GdkWindow *window,
GdkDrawable **real_drawable,
gint *x_offset,
gint *y_offset)
{
gint x_off, y_off;
GdkWindowObject *private;
g_return_if_fail (GDK_IS_WINDOW (window));
private = (GdkWindowObject *)window;
if (real_drawable)
{
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
*real_drawable = paint->pixmap;
}
else
*real_drawable = window;
}
gdk_window_get_offsets (window, &x_off, &y_off);
if (x_offset)
*x_offset = x_off;
if (y_offset)
*y_offset = y_off;
}
#define OFFSET_GC(gc) \
gint x_offset, y_offset; \
gint old_clip_x = gc->clip_x_origin; \
gint old_clip_y = gc->clip_y_origin; \
gint old_ts_x = gc->ts_x_origin; \
gint old_ts_y = gc->ts_y_origin; \
gdk_window_get_offsets (drawable, &x_offset, &y_offset); \
if (x_offset != 0 || y_offset != 0) \
{ \
gdk_gc_set_clip_origin (gc, old_clip_x - x_offset, \
old_clip_y - y_offset); \
gdk_gc_set_ts_origin (gc, old_ts_x - x_offset, \
old_ts_y - y_offset); \
}
#define RESTORE_GC(gc) \
if (x_offset != 0 || y_offset != 0) \
{ \
gdk_gc_set_clip_origin (gc, old_clip_x, old_clip_y); \
gdk_gc_set_ts_origin (gc, old_ts_x, old_ts_y); \
}
static GdkGC *
gdk_window_create_gc (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask mask)
{
g_return_val_if_fail (GDK_IS_WINDOW (drawable), NULL);
if (GDK_WINDOW_DESTROYED (drawable))
return NULL;
return gdk_gc_new_with_values (((GdkWindowObject *) drawable)->impl,
values, mask);
}
static void
gdk_window_draw_rectangle (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
gint x,
gint y,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_rectangle (paint->pixmap, gc, filled,
x - x_offset, y - y_offset, width, height);
}
else
gdk_draw_rectangle (private->impl, gc, filled,
x - x_offset, y - y_offset, width, height);
RESTORE_GC (gc);
}
static void
gdk_window_draw_arc (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
gint x,
gint y,
gint width,
gint height,
gint angle1,
gint angle2)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_arc (paint->pixmap, gc, filled,
x - x_offset, y - y_offset,
width, height, angle1, angle2);
}
else
gdk_draw_arc (private->impl, gc, filled,
x - x_offset, y - y_offset,
width, height, angle1, angle2);
RESTORE_GC (gc);
}
static void
gdk_window_draw_polygon (GdkDrawable *drawable,
GdkGC *gc,
gboolean filled,
GdkPoint *points,
gint npoints)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkPoint *new_points;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
int i;
new_points = g_new (GdkPoint, npoints);
for (i=0; i<npoints; i++)
{
new_points[i].x = points[i].x - x_offset;
new_points[i].y = points[i].y - y_offset;
}
}
else
new_points = points;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_polygon (paint->pixmap, gc, filled, new_points, npoints);
}
else
gdk_draw_polygon (private->impl, gc, filled, new_points, npoints);
if (new_points != points)
g_free (new_points);
RESTORE_GC (gc);
}
static void
gdk_window_draw_text (GdkDrawable *drawable,
GdkFont *font,
GdkGC *gc,
gint x,
gint y,
const gchar *text,
gint text_length)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_text (paint->pixmap, font, gc,
x - x_offset, y - y_offset, text, text_length);
}
else
gdk_draw_text (private->impl, font, gc,
x - x_offset, y - y_offset, text, text_length);
RESTORE_GC (gc);
}
static void
gdk_window_draw_text_wc (GdkDrawable *drawable,
GdkFont *font,
GdkGC *gc,
gint x,
gint y,
const GdkWChar *text,
gint text_length)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_text_wc (paint->pixmap, font, gc,
x - x_offset, y - y_offset, text, text_length);
}
else
gdk_draw_text_wc (private->impl, font, gc,
x - x_offset, y - y_offset, text, text_length);
RESTORE_GC (gc);
}
static GdkDrawable*
gdk_window_get_composite_drawable (GdkDrawable *drawable,
gint x,
gint y,
gint width,
gint height,
gint *composite_x_offset,
gint *composite_y_offset)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GSList *list;
GdkPixmap *tmp_pixmap;
GdkRectangle rect;
GdkGC *tmp_gc;
gboolean overlap_buffer;
_gdk_windowing_window_get_offsets (drawable,
composite_x_offset,
composite_y_offset);
if ((GDK_IS_WINDOW (drawable) && GDK_WINDOW_DESTROYED (drawable))
|| private->paint_stack == NULL)
{
/* No backing store */
return g_object_ref (drawable);
}
/* See if the buffered part is overlapping the part we want
* to get
*/
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
overlap_buffer = FALSE;
for (list = private->paint_stack; list != NULL; list = list->next)
{
GdkWindowPaint *paint = list->data;
GdkOverlapType overlap;
overlap = gdk_region_rect_in (paint->region, &rect);
if (overlap == GDK_OVERLAP_RECTANGLE_IN)
{
*composite_x_offset = paint->x_offset;
*composite_y_offset = paint->y_offset;
return g_object_ref (paint->pixmap);
}
else if (overlap == GDK_OVERLAP_RECTANGLE_PART)
{
overlap_buffer = TRUE;
break;
}
}
if (!overlap_buffer)
return g_object_ref (drawable);
tmp_pixmap = gdk_pixmap_new (drawable, width, height, -1);
tmp_gc = _gdk_drawable_get_scratch_gc (tmp_pixmap, FALSE);
/* Copy the current window contents */
gdk_draw_drawable (tmp_pixmap,
tmp_gc,
private->impl,
x - *composite_x_offset,
y - *composite_y_offset,
0, 0,
width, height);
/* paint the backing stores */
for (list = private->paint_stack; list != NULL; list = list->next)
{
GdkWindowPaint *paint = list->data;
gdk_gc_set_clip_region (tmp_gc, paint->region);
gdk_gc_set_clip_origin (tmp_gc, -x, -y);
gdk_draw_drawable (tmp_pixmap, tmp_gc, paint->pixmap,
x - paint->x_offset,
y - paint->y_offset,
0, 0, width, height);
}
/* Reset clip region of the cached GdkGC */
gdk_gc_set_clip_region (tmp_gc, NULL);
/* Set these to location of tmp_pixmap within the window */
*composite_x_offset = x;
*composite_y_offset = y;
return tmp_pixmap;
}
static GdkRegion*
gdk_window_get_clip_region (GdkDrawable *drawable)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkRegion *result;
result = gdk_drawable_get_clip_region (private->impl);
if (private->paint_stack)
{
GdkRegion *paint_region = gdk_region_new ();
GSList *tmp_list = private->paint_stack;
while (tmp_list)
{
GdkWindowPaint *paint = tmp_list->data;
gdk_region_union (paint_region, paint->region);
tmp_list = tmp_list->next;
}
gdk_region_intersect (result, paint_region);
gdk_region_destroy (paint_region);
}
return result;
}
static GdkRegion*
gdk_window_get_visible_region (GdkDrawable *drawable)
{
GdkWindowObject *private = (GdkWindowObject*) drawable;
return gdk_drawable_get_visible_region (private->impl);
}
static void
gdk_window_draw_drawable (GdkDrawable *drawable,
GdkGC *gc,
GdkPixmap *src,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
/* If we have a backing pixmap draw to that */
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_drawable (paint->pixmap, gc,
src, xsrc, ysrc,
xdest - x_offset, ydest - y_offset, width, height);
}
else
gdk_draw_drawable (private->impl, gc,
src, xsrc, ysrc,
xdest - x_offset, ydest - y_offset,
width, height);
RESTORE_GC (gc);
}
static void
gdk_window_draw_points (GdkDrawable *drawable,
GdkGC *gc,
GdkPoint *points,
gint npoints)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkPoint *new_points;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
gint i;
new_points = g_new (GdkPoint, npoints);
for (i=0; i<npoints; i++)
{
new_points[i].x = points[i].x - x_offset;
new_points[i].y = points[i].y - y_offset;
}
}
else
new_points = points;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_points (paint->pixmap, gc, new_points, npoints);
}
else
gdk_draw_points (private->impl, gc, points, npoints);
if (new_points != points)
g_free (new_points);
RESTORE_GC (gc);
}
static void
gdk_window_draw_segments (GdkDrawable *drawable,
GdkGC *gc,
GdkSegment *segs,
gint nsegs)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkSegment *new_segs;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
gint i;
new_segs = g_new (GdkSegment, nsegs);
for (i=0; i<nsegs; i++)
{
new_segs[i].x1 = segs[i].x1 - x_offset;
new_segs[i].y1 = segs[i].y1 - y_offset;
new_segs[i].x2 = segs[i].x2 - x_offset;
new_segs[i].y2 = segs[i].y2 - y_offset;
}
}
else
new_segs = segs;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_segments (paint->pixmap, gc, new_segs, nsegs);
}
else
gdk_draw_segments (private->impl, gc, new_segs, nsegs);
if (new_segs != segs)
g_free (new_segs);
RESTORE_GC (gc);
}
static void
gdk_window_draw_lines (GdkDrawable *drawable,
GdkGC *gc,
GdkPoint *points,
gint npoints)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkPoint *new_points;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
gint i;
new_points = g_new (GdkPoint, npoints);
for (i=0; i<npoints; i++)
{
new_points[i].x = points[i].x - x_offset;
new_points[i].y = points[i].y - y_offset;
}
}
else
new_points = points;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_lines (paint->pixmap, gc, new_points, npoints);
}
else
gdk_draw_lines (private->impl, gc, new_points, npoints);
if (new_points != points)
g_free (new_points);
RESTORE_GC (gc);
}
static void
gdk_window_draw_glyphs (GdkDrawable *drawable,
GdkGC *gc,
PangoFont *font,
gint x,
gint y,
PangoGlyphString *glyphs)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_glyphs (paint->pixmap, gc, font, x - x_offset, y - y_offset, glyphs);
}
else
gdk_draw_glyphs (private->impl, gc, font,
x - x_offset, y - y_offset, glyphs);
RESTORE_GC (gc);
}
static void
gdk_window_draw_glyphs_transformed (GdkDrawable *drawable,
GdkGC *gc,
PangoMatrix *matrix,
PangoFont *font,
gint x,
gint y,
PangoGlyphString *glyphs)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
PangoMatrix tmp_matrix;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
if (matrix)
{
tmp_matrix = *matrix;
tmp_matrix.x0 -= x_offset;
tmp_matrix.y0 -= y_offset;
matrix = &tmp_matrix;
}
else
{
x -= x_offset * PANGO_SCALE;
y -= y_offset * PANGO_SCALE;
}
}
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_glyphs_transformed (paint->pixmap, gc, matrix, font, x, y, glyphs);
}
else
gdk_draw_glyphs_transformed (private->impl, gc, matrix, font, x, y, glyphs);
RESTORE_GC (gc);
}
typedef struct {
cairo_t *cr; /* if non-null, it means use this cairo context */
GdkGC *gc; /* if non-null, it means use this GC instead */
} BackingRectMethod;
static void
setup_backing_rect_method (BackingRectMethod *method, GdkWindow *window, GdkWindowPaint *paint, int x_offset_cairo, int y_offset_cairo)
{
GdkWindowObject *private = (GdkWindowObject *)window;
if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG && private->parent)
{
GdkWindowPaint tmp_paint;
tmp_paint = *paint;
tmp_paint.x_offset += private->x;
tmp_paint.y_offset += private->y;
x_offset_cairo += private->x;
y_offset_cairo += private->y;
setup_backing_rect_method (method, GDK_WINDOW (private->parent), &tmp_paint, x_offset_cairo, y_offset_cairo);
}
else if (private->bg_pixmap &&
private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
private->bg_pixmap != GDK_NO_BG)
{
/* This is a workaround for https://bugs.freedesktop.org/show_bug.cgi?id=4320.
* In it, using a pixmap as a repeating pattern in Cairo, and painting it to a
* pixmap destination surface, can be very slow (on the order of seconds for a
* whole-screen copy). The workaround is to use pretty much the same code that
* we used in GTK+ 2.6 (pre-Cairo), which clears the double-buffer pixmap with
* a tiled GC XFillRectangle().
*/
/* Actually computing this flag is left as an exercise for the reader */
#if defined (G_OS_UNIX)
# define GDK_CAIRO_REPEAT_IS_FAST 0
#else
# define GDK_CAIRO_REPEAT_IS_FAST 1
#endif
#if GDK_CAIRO_REPEAT_IS_FAST
cairo_surface_t *surface = _gdk_drawable_ref_cairo_surface (private->bg_pixmap);
cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy (surface);
if (x_offset_cairo != 0 || y_offset_cairo != 0)
{
cairo_matrix_t matrix;
cairo_matrix_init_translate (&matrix, x_offset_cairo, y_offset_cairo);
cairo_pattern_set_matrix (pattern, &matrix);
}
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
method->cr = cairo_create (paint->surface);
method->gc = NULL;
cairo_set_source (method->cr, pattern);
cairo_pattern_destroy (pattern);
#else
guint gc_mask;
GdkGCValues gc_values;
gc_values.fill = GDK_TILED;
gc_values.tile = private->bg_pixmap;
gc_values.ts_x_origin = -x_offset_cairo;
gc_values.ts_y_origin = -y_offset_cairo;
gc_mask = GDK_GC_FILL | GDK_GC_TILE | GDK_GC_TS_X_ORIGIN | GDK_GC_TS_Y_ORIGIN;
method->gc = gdk_gc_new_with_values (paint->pixmap, &gc_values, gc_mask);
#endif
}
else
{
method->cr = cairo_create (paint->surface);
gdk_cairo_set_source_color (method->cr, &private->bg_color);
}
}
static void
gdk_window_clear_backing_rect (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)window;
GdkWindowPaint *paint = private->paint_stack->data;
BackingRectMethod method;
#if 0
GTimer *timer;
double elapsed;
#endif
if (GDK_WINDOW_DESTROYED (window))
return;
#if 0
timer = g_timer_new ();
#endif
method.cr = NULL;
method.gc = NULL;
setup_backing_rect_method (&method, window, paint, 0, 0);
if (method.cr)
{
g_assert (method.gc == NULL);
cairo_rectangle (method.cr, x, y, width, height);
cairo_clip (method.cr);
gdk_cairo_region (method.cr, paint->region);
cairo_fill (method.cr);
cairo_destroy (method.cr);
#if 0
elapsed = g_timer_elapsed (timer, NULL);
g_print ("Draw the background with Cairo: %fs\n", elapsed);
#endif
}
else
{
g_assert (method.gc != NULL);
gdk_gc_set_clip_region (method.gc, paint->region);
gdk_draw_rectangle (window, method.gc, TRUE, x, y, width, height);
g_object_unref (method.gc);
#if 0
elapsed = g_timer_elapsed (timer, NULL);
g_print ("Draw the background with GDK: %fs\n", elapsed);
#endif
}
#if 0
g_timer_destroy (timer);
#endif
}
/**
* gdk_window_clear:
* @window: a #GdkWindow
*
* Clears an entire @window to the background color or background pixmap.
**/
void
gdk_window_clear (GdkWindow *window)
{
gint width, height;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
gdk_drawable_get_size (GDK_DRAWABLE (window), &width, &height);
gdk_window_clear_area (window, 0, 0,
width, height);
}
/**
* gdk_window_clear_area:
* @window: a #GdkWindow
* @x: x coordinate of rectangle to clear
* @y: y coordinate of rectangle to clear
* @width: width of rectangle to clear
* @height: height of rectangle to clear
*
* Clears an area of @window to the background color or background pixmap.
*
**/
void
gdk_window_clear_area (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (private->paint_stack)
gdk_window_clear_backing_rect (window, x, y, width, height);
else
_gdk_windowing_window_clear_area (window, x, y, width, height);
}
/**
* gdk_window_clear_area_e:
* @window: a #GdkWindow
* @x: x coordinate of rectangle to clear
* @y: y coordinate of rectangle to clear
* @width: width of rectangle to clear
* @height: height of rectangle to clear
*
* Like gdk_window_clear_area(), but also generates an expose event for
* the cleared area.
*
* This function has a stupid name because it dates back to the mists
* time, pre-GDK-1.0.
*
**/
void
gdk_window_clear_area_e (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (private->paint_stack)
gdk_window_clear_backing_rect (window, x, y, width, height);
_gdk_windowing_window_clear_area_e (window, x, y, width, height);
}
static void
gdk_window_draw_image (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_image (paint->pixmap, gc, image, xsrc, ysrc,
xdest - x_offset, ydest - y_offset,
width, height);
}
else
gdk_draw_image (private->impl, gc, image, xsrc, ysrc,
xdest - x_offset, ydest - y_offset,
width, height);
RESTORE_GC (gc);
}
static void
gdk_window_draw_pixbuf (GdkDrawable *drawable,
GdkGC *gc,
GdkPixbuf *pixbuf,
gint src_x,
gint src_y,
gint dest_x,
gint dest_y,
gint width,
gint height,
GdkRgbDither dither,
gint x_dither,
gint y_dither)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (gc)
{
OFFSET_GC (gc);
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_pixbuf (paint->pixmap, gc, pixbuf, src_x, src_y,
dest_x - x_offset, dest_y - y_offset,
width, height,
dither, x_dither - x_offset, y_dither - y_offset);
}
else
gdk_draw_pixbuf (private->impl, gc, pixbuf, src_x, src_y,
dest_x - x_offset, dest_y - y_offset,
width, height,
dither, x_dither, y_dither);
RESTORE_GC (gc);
}
else
{
gint x_offset, y_offset;
gdk_window_get_offsets (drawable, &x_offset, &y_offset);
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_pixbuf (paint->pixmap, gc, pixbuf, src_x, src_y,
dest_x - x_offset, dest_y - y_offset,
width, height,
dither, x_dither - x_offset, y_dither - y_offset);
}
else
gdk_draw_pixbuf (private->impl, gc, pixbuf, src_x, src_y,
dest_x - x_offset, dest_y - y_offset,
width, height,
dither, x_dither, y_dither);
}
}
static void
gdk_window_draw_trapezoids (GdkDrawable *drawable,
GdkGC *gc,
GdkTrapezoid *trapezoids,
gint n_trapezoids)
{
GdkWindowObject *private = (GdkWindowObject *)drawable;
GdkTrapezoid *new_trapezoids = NULL;
OFFSET_GC (gc);
if (GDK_WINDOW_DESTROYED (drawable))
return;
if (x_offset != 0 || y_offset != 0)
{
gint i;
new_trapezoids = g_new (GdkTrapezoid, n_trapezoids);
for (i=0; i < n_trapezoids; i++)
{
new_trapezoids[i].y1 = trapezoids[i].y1 - y_offset;
new_trapezoids[i].x11 = trapezoids[i].x11 - x_offset;
new_trapezoids[i].x21 = trapezoids[i].x21 - x_offset;
new_trapezoids[i].y2 = trapezoids[i].y2 - y_offset;
new_trapezoids[i].x12 = trapezoids[i].x12 - x_offset;
new_trapezoids[i].x22 = trapezoids[i].x22 - x_offset;
}
trapezoids = new_trapezoids;
}
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
gdk_draw_trapezoids (paint->pixmap, gc, trapezoids, n_trapezoids);
}
else
gdk_draw_trapezoids (private->impl, gc, trapezoids, n_trapezoids);
if (new_trapezoids)
g_free (new_trapezoids);
RESTORE_GC (gc);
}
static void
gdk_window_real_get_size (GdkDrawable *drawable,
gint *width,
gint *height)
{
g_return_if_fail (GDK_IS_WINDOW (drawable));
gdk_drawable_get_size (GDK_WINDOW_OBJECT (drawable)->impl,
width, height);
}
static GdkVisual*
gdk_window_real_get_visual (GdkDrawable *drawable)
{
GdkColormap *colormap;
g_return_val_if_fail (GDK_IS_WINDOW (drawable), NULL);
colormap = gdk_drawable_get_colormap (drawable);
return colormap ? gdk_colormap_get_visual (colormap) : NULL;
}
static gint
gdk_window_real_get_depth (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_WINDOW (drawable), 0);
return ((GdkWindowObject *)GDK_WINDOW (drawable))->depth;
}
static GdkScreen*
gdk_window_real_get_screen (GdkDrawable *drawable)
{
return gdk_drawable_get_screen (GDK_WINDOW_OBJECT (drawable)->impl);
}
static void
gdk_window_real_set_colormap (GdkDrawable *drawable,
GdkColormap *cmap)
{
g_return_if_fail (GDK_IS_WINDOW (drawable));
if (GDK_WINDOW_DESTROYED (drawable))
return;
gdk_drawable_set_colormap (((GdkWindowObject*)drawable)->impl, cmap);
}
static GdkColormap*
gdk_window_real_get_colormap (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_WINDOW (drawable), NULL);
if (GDK_WINDOW_DESTROYED (drawable))
return NULL;
return gdk_drawable_get_colormap (((GdkWindowObject*)drawable)->impl);
}
static GdkImage*
gdk_window_copy_to_image (GdkDrawable *drawable,
GdkImage *image,
gint src_x,
gint src_y,
gint dest_x,
gint dest_y,
gint width,
gint height)
{
gint x_offset, y_offset;
g_return_val_if_fail (GDK_IS_WINDOW (drawable), NULL);
if (GDK_WINDOW_DESTROYED (drawable))
return NULL;
/* If we're here, a composite image was not necessary, so
* we can ignore the paint stack.
*/
_gdk_windowing_window_get_offsets (drawable, &x_offset, &y_offset);
return gdk_drawable_copy_to_image (((GdkWindowObject*)drawable)->impl,
image,
src_x - x_offset,
src_y - y_offset,
dest_x, dest_y,
width, height);
}
static cairo_surface_t *
gdk_window_ref_cairo_surface (GdkDrawable *drawable)
{
GdkWindowObject *private = (GdkWindowObject*) drawable;
cairo_surface_t *surface;
if (private->paint_stack)
{
GdkWindowPaint *paint = private->paint_stack->data;
surface = paint->surface;
cairo_surface_reference (surface);
}
else
surface = _gdk_drawable_ref_cairo_surface (private->impl);
return surface;
}
/* Code for dirty-region queueing
*/
static GSList *update_windows = NULL;
static guint update_idle = 0;
static gboolean debug_updates = FALSE;
static gboolean
gdk_window_update_idle (gpointer data)
{
GDK_THREADS_ENTER ();
gdk_window_process_all_updates ();
GDK_THREADS_LEAVE ();
return FALSE;
}
static void
gdk_window_schedule_update (GdkWindow *window)
{
if (window && GDK_WINDOW_OBJECT (window)->update_freeze_count)
return;
if (!update_idle)
{
update_idle = g_idle_add_full (GDK_PRIORITY_REDRAW,
gdk_window_update_idle, NULL, NULL);
}
}
static void
gdk_window_process_updates_internal (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
gboolean save_region = FALSE;
/* If an update got queued during update processing, we can get a
* window in the update queue that has an empty update_area.
* just ignore it.
*/
if (private->update_area)
{
GdkRegion *update_area = private->update_area;
private->update_area = NULL;
if (_gdk_event_func && gdk_window_is_viewable (window))
{
GdkRectangle window_rect;
GdkRegion *expose_region;
GdkRegion *window_region;
gint width, height;
if (debug_updates)
{
/* Make sure we see the red invalid area before redrawing. */
gdk_display_sync (gdk_drawable_get_display (window));
g_usleep (70000);
}
save_region = _gdk_windowing_window_queue_antiexpose (window, update_area);
if (save_region)
expose_region = gdk_region_copy (update_area);
else
expose_region = update_area;
gdk_drawable_get_size (GDK_DRAWABLE (private), &width, &height);
window_rect.x = 0;
window_rect.y = 0;
window_rect.width = width;
window_rect.height = height;
window_region = gdk_region_rectangle (&window_rect);
gdk_region_intersect (expose_region,
window_region);
gdk_region_destroy (window_region);
if (!gdk_region_empty (expose_region) &&
(private->event_mask & GDK_EXPOSURE_MASK))
{
GdkEvent event;
event.expose.type = GDK_EXPOSE;
event.expose.window = g_object_ref (window);
event.expose.send_event = FALSE;
event.expose.count = 0;
event.expose.region = expose_region;
gdk_region_get_clipbox (expose_region, &event.expose.area);
(*_gdk_event_func) (&event, _gdk_event_data);
g_object_unref (window);
}
if (expose_region != update_area)
gdk_region_destroy (expose_region);
}
if (!save_region)
gdk_region_destroy (update_area);
}
}
static void
flush_all_displays (void)
{
GSList *displays = gdk_display_manager_list_displays (gdk_display_manager_get ());
GSList *tmp_list;
for (tmp_list = displays; tmp_list; tmp_list = tmp_list->next)
gdk_display_flush (tmp_list->data);
g_slist_free (displays);
}
/* Currently it is not possible to override
* gdk_window_process_all_updates in the same manner as
* gdk_window_process_updates and gdk_window_invalidate_maybe_recurse
* by implementing the GdkPaintable interface. If in the future a
* backend would need this, the right solution would be to add a
* method to GdkDisplay that can be optionally
* NULL. gdk_window_process_all_updates can then walk the list of open
* displays and call the mehod.
*/
/**
* gdk_window_process_all_updates:
*
* Calls gdk_window_process_updates() for all windows (see #GdkWindow)
* in the application.
*
**/
void
gdk_window_process_all_updates (void)
{
GSList *old_update_windows = update_windows;
GSList *tmp_list = update_windows;
if (update_idle)
g_source_remove (update_idle);
update_windows = NULL;
update_idle = 0;
g_slist_foreach (old_update_windows, (GFunc)g_object_ref, NULL);
while (tmp_list)
{
GdkWindowObject *private = (GdkWindowObject *)tmp_list->data;
if (private->update_freeze_count)
update_windows = g_slist_prepend (update_windows, private);
else
gdk_window_process_updates_internal (tmp_list->data);
g_object_unref (tmp_list->data);
tmp_list = tmp_list->next;
}
g_slist_free (old_update_windows);
flush_all_displays ();
}
/**
* gdk_window_process_updates:
* @window: a #GdkWindow
* @update_children: whether to also process updates for child windows
*
* Sends one or more expose events to @window. The areas in each
* expose event will cover the entire update area for the window (see
* gdk_window_invalidate_region() for details). Normally GDK calls
* gdk_window_process_all_updates() on your behalf, so there's no
* need to call this function unless you want to force expose events
* to be delivered immediately and synchronously (vs. the usual
* case, where GDK delivers them in an idle handler). Occasionally
* this is useful to produce nicer scrolling behavior, for example.
*
**/
void
gdk_window_process_updates (GdkWindow *window,
gboolean update_children)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_IS_PAINTABLE (private->impl) &&
GDK_PAINTABLE_GET_IFACE (private->impl)->process_updates)
{
GDK_PAINTABLE_GET_IFACE (private->impl)->process_updates (GDK_PAINTABLE (private->impl), update_children);
return;
}
if (private->update_area && !private->update_freeze_count)
{
gdk_window_process_updates_internal (window);
update_windows = g_slist_remove (update_windows, window);
}
if (update_children)
{
GList *tmp_list = private->children;
while (tmp_list)
{
gdk_window_process_updates (tmp_list->data, TRUE);
tmp_list = tmp_list->next;
}
}
}
/**
* gdk_window_invalidate_rect:
* @window: a #GdkWindow
* @rect: rectangle to invalidate
* @invalidate_children: whether to also invalidate child windows
*
* A convenience wrapper around gdk_window_invalidate_region() which
* invalidates a rectangular region. See
* gdk_window_invalidate_region() for details.
*
**/
void
gdk_window_invalidate_rect (GdkWindow *window,
GdkRectangle *rect,
gboolean invalidate_children)
{
GdkRectangle window_rect;
GdkRegion *region;
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_WINDOW_DESTROYED (window))
return;
if (private->input_only || !GDK_WINDOW_IS_MAPPED (window))
return;
if (!rect)
{
window_rect.x = 0;
window_rect.y = 0;
gdk_drawable_get_size (GDK_DRAWABLE (window),
&window_rect.width,
&window_rect.height);
rect = &window_rect;
}
region = gdk_region_rectangle (rect);
gdk_window_invalidate_region (window, region, invalidate_children);
gdk_region_destroy (region);
}
static void
draw_ugly_color (GdkWindow *window,
GdkRegion *region)
{
/* Draw ugly color all over the newly-invalid region */
GdkColor ugly_color = { 0, 50000, 10000, 10000 };
GdkGC *ugly_gc;
GdkRectangle clipbox;
ugly_gc = gdk_gc_new (window);
gdk_gc_set_rgb_fg_color (ugly_gc, &ugly_color);
gdk_gc_set_clip_region (ugly_gc, region);
gdk_region_get_clipbox (region, &clipbox);
gdk_draw_rectangle (window,
ugly_gc,
TRUE,
clipbox.x, clipbox.y,
clipbox.width, clipbox.height);
g_object_unref (ugly_gc);
}
/**
* gdk_window_invalidate_maybe_recurse:
* @window: a #GdkWindow
* @region: a #GdkRegion
* @child_func: function to use to decide if to recurse to a child,
* %NULL means never recurse.
* @user_data: data passed to @child_func
*
* Adds @region to the update area for @window. The update area is the
* region that needs to be redrawn, or "dirty region." The call
* gdk_window_process_updates() sends one or more expose events to the
* window, which together cover the entire update area. An
* application would normally redraw the contents of @window in
* response to those expose events.
*
* GDK will call gdk_window_process_all_updates() on your behalf
* whenever your program returns to the main loop and becomes idle, so
* normally there's no need to do that manually, you just need to
* invalidate regions that you know should be redrawn.
*
* The @child_func parameter controls whether the region of
* each child window that intersects @region will also be invalidated.
* Only children for which @child_func returns TRUE will have the area
* invalidated.
**/
void
gdk_window_invalidate_maybe_recurse (GdkWindow *window,
GdkRegion *region,
gboolean (*child_func) (GdkWindow *, gpointer),
gpointer user_data)
{
GdkWindowObject *private = (GdkWindowObject *)window;
GdkRegion *visible_region;
GList *tmp_list;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_WINDOW_DESTROYED (window))
return;
if (private->input_only || !GDK_WINDOW_IS_MAPPED (window))
return;
if (GDK_IS_PAINTABLE (private->impl) &&
GDK_PAINTABLE_GET_IFACE (private->impl)->invalidate_maybe_recurse)
{
GDK_PAINTABLE_GET_IFACE (private->impl)->invalidate_maybe_recurse (GDK_PAINTABLE (private->impl), region,
child_func, user_data);
return;
}
visible_region = gdk_drawable_get_visible_region (window);
gdk_region_intersect (visible_region, region);
tmp_list = private->children;
while (tmp_list)
{
GdkWindowObject *child = tmp_list->data;
if (!child->input_only)
{
GdkRegion *child_region;
GdkRectangle child_rect;
gdk_window_get_position ((GdkWindow *)child,
&child_rect.x, &child_rect.y);
gdk_drawable_get_size ((GdkDrawable *)child,
&child_rect.width, &child_rect.height);
child_region = gdk_region_rectangle (&child_rect);
/* remove child area from the invalid area of the parent */
if (GDK_WINDOW_IS_MAPPED (child) && !child->shaped)
gdk_region_subtract (visible_region, child_region);
if (child_func && (*child_func) ((GdkWindow *)child, user_data))
{
gdk_region_offset (region, - child_rect.x, - child_rect.y);
gdk_region_offset (child_region, - child_rect.x, - child_rect.y);
gdk_region_intersect (child_region, region);
gdk_window_invalidate_maybe_recurse ((GdkWindow *)child,
child_region, child_func, user_data);
gdk_region_offset (region, child_rect.x, child_rect.y);
}
gdk_region_destroy (child_region);
}
tmp_list = tmp_list->next;
}
if (!gdk_region_empty (visible_region))
{
if (debug_updates)
draw_ugly_color (window, region);
if (private->update_area)
{
gdk_region_union (private->update_area, visible_region);
}
else
{
update_windows = g_slist_prepend (update_windows, window);
private->update_area = gdk_region_copy (visible_region);
gdk_window_schedule_update (window);
}
}
gdk_region_destroy (visible_region);
}
static gboolean
true_predicate (GdkWindow *window,
gpointer user_data)
{
return TRUE;
}
/**
* gdk_window_invalidate_region:
* @window: a #GdkWindow
* @region: a #GdkRegion
* @invalidate_children: %TRUE to also invalidate child windows
*
* Adds @region to the update area for @window. The update area is the
* region that needs to be redrawn, or "dirty region." The call
* gdk_window_process_updates() sends one or more expose events to the
* window, which together cover the entire update area. An
* application would normally redraw the contents of @window in
* response to those expose events.
*
* GDK will call gdk_window_process_all_updates() on your behalf
* whenever your program returns to the main loop and becomes idle, so
* normally there's no need to do that manually, you just need to
* invalidate regions that you know should be redrawn.
*
* The @invalidate_children parameter controls whether the region of
* each child window that intersects @region will also be invalidated.
* If %FALSE, then the update area for child windows will remain
* unaffected. See gdk_window_invalidate_maybe_recurse if you need
* fine grained control over which children are invalidated.
**/
void
gdk_window_invalidate_region (GdkWindow *window,
GdkRegion *region,
gboolean invalidate_children)
{
gdk_window_invalidate_maybe_recurse (window, region,
invalidate_children ?
true_predicate : (gboolean (*) (GdkWindow *, gpointer))NULL,
NULL);
}
/**
* gdk_window_get_update_area:
* @window: a #GdkWindow
*
* Transfers ownership of the update area from @window to the caller
* of the function. That is, after calling this function, @window will
* no longer have an invalid/dirty region; the update area is removed
* from @window and handed to you. If a window has no update area,
* gdk_window_get_update_area() returns %NULL. You are responsible for
* calling gdk_region_destroy() on the returned region if it's non-%NULL.
*
* Return value: the update area for @window
**/
GdkRegion *
gdk_window_get_update_area (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
GdkRegion *tmp_region;
g_return_val_if_fail (window != NULL, NULL);
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
if (private->update_area)
{
tmp_region = private->update_area;
private->update_area = NULL;
update_windows = g_slist_remove (update_windows, window);
return tmp_region;
}
else
return NULL;
}
/**
* _gdk_window_clear_update_area:
* @window: a #GdkWindow.
*
* Internal function to clear the update area for a window. This
* is called when the window is hidden or destroyed.
**/
void
_gdk_window_clear_update_area (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (private->update_area)
{
update_windows = g_slist_remove (update_windows, window);
gdk_region_destroy (private->update_area);
private->update_area = NULL;
}
}
/**
* gdk_window_freeze_updates:
* @window: a #GdkWindow
*
* Temporarily freezes a window such that it won't receive expose
* events. The window will begin receiving expose events again when
* gdk_window_thaw_updates() is called. If gdk_window_freeze_updates()
* has been called more than once, gdk_window_thaw_updates() must be called
* an equal number of times to begin processing exposes.
**/
void
gdk_window_freeze_updates (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
private->update_freeze_count++;
}
/**
* gdk_window_thaw_updates:
* @window: a #GdkWindow
*
* Thaws a window frozen with gdk_window_freeze_updates().
**/
void
gdk_window_thaw_updates (GdkWindow *window)
{
GdkWindowObject *private = (GdkWindowObject *)window;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
g_return_if_fail (private->update_freeze_count > 0);
if (--private->update_freeze_count == 0)
gdk_window_schedule_update (window);
}
/**
* gdk_window_set_debug_updates:
* @setting: %TRUE to turn on update debugging
*
* With update debugging enabled, calls to
* gdk_window_invalidate_region() clear the invalidated region of the
* screen to a noticeable color, and GDK pauses for a short time
* before sending exposes to windows during
* gdk_window_process_updates(). The net effect is that you can see
* the invalid region for each window and watch redraws as they
* occur. This allows you to diagnose inefficiencies in your application.
*
* In essence, because the GDK rendering model prevents all flicker,
* if you are redrawing the same region 400 times you may never
* notice, aside from noticing a speed problem. Enabling update
* debugging causes GTK to flicker slowly and noticeably, so you can
* see exactly what's being redrawn when, in what order.
*
* The --gtk-debug=updates command line option passed to GTK+ programs
* enables this debug option at application startup time. That's
* usually more useful than calling gdk_window_set_debug_updates()
* yourself, though you might want to use this function to enable
* updates sometime after application startup time.
*
**/
void
gdk_window_set_debug_updates (gboolean setting)
{
debug_updates = setting;
}
/**
* gdk_window_constrain_size:
* @geometry: a #GdkGeometry structure
* @flags: a mask indicating what portions of @geometry are set
* @width: desired width of window
* @height: desired height of the window
* @new_width: location to store resulting width
* @new_height: location to store resulting height
*
* Constrains a desired width and height according to a
* set of geometry hints (such as minimum and maximum size).
*/
void
gdk_window_constrain_size (GdkGeometry *geometry,
guint flags,
gint width,
gint height,
gint *new_width,
gint *new_height)
{
/* This routine is partially borrowed from fvwm.
*
* Copyright 1993, Robert Nation
* You may use this code for any purpose, as long as the original
* copyright remains in the source code and all documentation
*
* which in turn borrows parts of the algorithm from uwm
*/
gint min_width = 0;
gint min_height = 0;
gint base_width = 0;
gint base_height = 0;
gint xinc = 1;
gint yinc = 1;
gint max_width = G_MAXINT;
gint max_height = G_MAXINT;
#define FLOOR(value, base) ( ((gint) ((value) / (base))) * (base) )
if ((flags & GDK_HINT_BASE_SIZE) && (flags & GDK_HINT_MIN_SIZE))
{
base_width = geometry->base_width;
base_height = geometry->base_height;
min_width = geometry->min_width;
min_height = geometry->min_height;
}
else if (flags & GDK_HINT_BASE_SIZE)
{
base_width = geometry->base_width;
base_height = geometry->base_height;
min_width = geometry->base_width;
min_height = geometry->base_height;
}
else if (flags & GDK_HINT_MIN_SIZE)
{
base_width = geometry->min_width;
base_height = geometry->min_height;
min_width = geometry->min_width;
min_height = geometry->min_height;
}
if (flags & GDK_HINT_MAX_SIZE)
{
max_width = geometry->max_width ;
max_height = geometry->max_height;
}
if (flags & GDK_HINT_RESIZE_INC)
{
xinc = MAX (xinc, geometry->width_inc);
yinc = MAX (yinc, geometry->height_inc);
}
/* clamp width and height to min and max values
*/
width = CLAMP (width, min_width, max_width);
height = CLAMP (height, min_height, max_height);
/* shrink to base + N * inc
*/
width = base_width + FLOOR (width - base_width, xinc);
height = base_height + FLOOR (height - base_height, yinc);
/* constrain aspect ratio, according to:
*
* width
* min_aspect <= -------- <= max_aspect
* height
*/
if (flags & GDK_HINT_ASPECT &&
geometry->min_aspect > 0 &&
geometry->max_aspect > 0)
{
gint delta;
if (geometry->min_aspect * height > width)
{
delta = FLOOR (height - width / geometry->min_aspect, yinc);
if (height - delta >= min_height)
height -= delta;
else
{
delta = FLOOR (height * geometry->min_aspect - width, xinc);
if (width + delta <= max_width)
width += delta;
}
}
if (geometry->max_aspect * height < width)
{
delta = FLOOR (width - height * geometry->max_aspect, xinc);
if (width - delta >= min_width)
width -= delta;
else
{
delta = FLOOR (width / geometry->max_aspect - height, yinc);
if (height + delta <= max_height)
height += delta;
}
}
}
#undef FLOOR
*new_width = width;
*new_height = height;
}
/**
* gdk_window_get_pointer:
* @window: a #GdkWindow
* @x: return location for X coordinate of pointer
* @y: return location for Y coordinate of pointer
* @mask: return location for modifier mask
*
* Obtains the current pointer position and modifier state.
* The position is given in coordinates relative to the upper left
* corner of @window.
*
* Return value: the window containing the pointer (as with
* gdk_window_at_pointer()), or %NULL if the window containing the
* pointer isn't known to GDK
**/
GdkWindow*
gdk_window_get_pointer (GdkWindow *window,
gint *x,
gint *y,
GdkModifierType *mask)
{
GdkDisplay *display;
gint tmp_x, tmp_y;
GdkModifierType tmp_mask;
GdkWindow *child;
g_return_val_if_fail (window == NULL || GDK_IS_WINDOW (window), NULL);
if (window)
{
display = gdk_drawable_get_display (window);
}
else
{
GdkScreen *screen = gdk_screen_get_default ();
display = gdk_screen_get_display (screen);
window = gdk_screen_get_root_window (screen);
GDK_NOTE (MULTIHEAD,
g_message ("Passing NULL for window to gdk_window_get_pointer()\n"
"is not multihead safe"));
}
child = display->pointer_hooks->window_get_pointer (display, window, &tmp_x, &tmp_y, &tmp_mask);
if (x)
*x = tmp_x;
if (y)
*y = tmp_y;
if (mask)
*mask = tmp_mask;
return child;
}
/**
* gdk_window_at_pointer:
* @win_x: return location for origin of the window under the pointer
* @win_y: return location for origin of the window under the pointer
*
* Obtains the window underneath the mouse pointer, returning the
* location of that window in @win_x, @win_y. Returns %NULL if the
* window under the mouse pointer is not known to GDK (if the window
* belongs to another application and a #GdkWindow hasn't been created
* for it with gdk_window_foreign_new())
*
* NOTE: For multihead-aware widgets or applications use
* gdk_display_get_window_at_pointer() instead.
*
* Return value: window under the mouse pointer
**/
GdkWindow*
gdk_window_at_pointer (gint *win_x,
gint *win_y)
{
return gdk_display_get_window_at_pointer (gdk_display_get_default (), win_x, win_y);
}
/**
* gdk_get_default_root_window:
*
* Obtains the root window (parent all other windows are inside)
* for the default display and screen.
*
* Return value: the default root window
**/
GdkWindow *
gdk_get_default_root_window (void)
{
return gdk_screen_get_root_window (gdk_screen_get_default ());
}
/**
* gdk_window_foreign_new:
* @anid: a native window handle.
*
* Wraps a native window for the default display in a #GdkWindow.
* This may fail if the window has been destroyed.
*
* For example in the X backend, a native window handle is an Xlib
* <type>XID</type>.
*
* Return value: the newly-created #GdkWindow wrapper for the
* native window or %NULL if the window has been destroyed.
**/
GdkWindow *
gdk_window_foreign_new (GdkNativeWindow anid)
{
return gdk_window_foreign_new_for_display (gdk_display_get_default (), anid);
}
#define __GDK_WINDOW_C__
#include "gdkaliasdef.c"
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