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gtk2/gdk/gdkwindow.c
Havoc Pennington fffbc2b16e mention that window arg can be NULL 
2002-01-21  Havoc Pennington  <hp@pobox.com>

	* gdk/gdkwindow.c (gdk_window_add_filter): mention that window
	arg can be NULL
2002-01-21 05:58:33 +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 "gdkwindow.h"
#include "gdkinternals.h"
#include "gdk.h" /* For gdk_rectangle_union() */
#include "gdkpixmap.h"
#include "gdkdrawable.h"
#include "gdkpixmap.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;
};
static const GdkPointerHooks default_pointer_hooks = {
_gdk_windowing_window_get_pointer,
_gdk_windowing_window_at_pointer
};
static const GdkPointerHooks *current_pointer_hooks = &default_pointer_hooks;
static GdkGC *gdk_window_create_gc (GdkDrawable *drawable,
GdkGCValues *values,
GdkGCValuesMask mask);
static void gdk_window_draw_rectangle (GdkDrawable *drawable,
GdkGC *gc,
gint filled,
gint x,
gint y,
gint width,
gint height);
static void gdk_window_draw_arc (GdkDrawable *drawable,
GdkGC *gc,
gint filled,
gint x,
gint y,
gint width,
gint height,
gint angle1,
gint angle2);
static void gdk_window_draw_polygon (GdkDrawable *drawable,
GdkGC *gc,
gint 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_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 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 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 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 gpointer parent_class = NULL;
GType
gdk_window_object_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (GdkWindowObjectClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_window_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GdkWindowObject),
0, /* n_preallocs */
(GInstanceInitFunc) gdk_window_init,
};
object_type = g_type_register_static (GDK_TYPE_DRAWABLE,
"GdkWindow",
&object_info, 0);
}
return object_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_image = gdk_window_draw_image;
drawable_class->_draw_pixbuf = gdk_window_draw_pixbuf;
drawable_class->get_depth = gdk_window_real_get_depth;
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->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 (G_OBJECT (obj->impl));
obj->impl = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* _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;
GList *children;
GList *tmp;
g_return_if_fail (window != NULL);
private = (GdkWindowObject*) window;
switch (GDK_WINDOW_TYPE (window))
{
case GDK_WINDOW_TOPLEVEL:
case GDK_WINDOW_CHILD:
case GDK_WINDOW_DIALOG:
case GDK_WINDOW_TEMP:
case GDK_WINDOW_FOREIGN:
if (!GDK_WINDOW_DESTROYED (window))
{
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)
{
gdk_pixmap_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->destroyed = TRUE;
if (private->filters)
{
tmp = private->filters;
while (tmp)
{
g_free (tmp->data);
tmp = tmp->next;
}
g_list_free (private->filters);
private->filters = NULL;
}
gdk_drawable_set_colormap (GDK_DRAWABLE (window), NULL);
}
break;
case GDK_WINDOW_ROOT:
g_error ("attempted to destroy root window");
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 @window (destroys the server-side resource associated with
* @window). Memory allocated for @window may not be freed until all
* references to @window are dropped. All children of @window are also
* destroyed.
*
* There's normally no need to use this function, window are automatically
* destroyed when their reference count reaches 0.
*
**/
void
gdk_window_destroy (GdkWindow *window)
{
_gdk_window_destroy_hierarchy (window, FALSE, FALSE);
gdk_drawable_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_window_get_toplevels:
*
* Obtains a list of all toplevel windows known to GDK.
* 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)
{
GList *new_list = NULL;
GList *tmp_list;
tmp_list = ((GdkWindowObject *)_gdk_parent_root)->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_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;
g_return_val_if_fail (window != NULL, FALSE);
g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
while (private &&
(private != (GdkWindowObject *)_gdk_parent_root) &&
(GDK_WINDOW_TYPE (private) != GDK_WINDOW_FOREIGN))
{
if (!GDK_WINDOW_IS_MAPPED (window))
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);
}
static GdkGC *
gdk_window_get_bg_gc (GdkWindow *window, GdkWindowPaint *paint)
{
GdkWindowObject *private = (GdkWindowObject *)window;
guint gc_mask = 0;
GdkGCValues gc_values;
if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG && private->parent)
{
GdkWindowPaint tmp_paint = *paint;
tmp_paint.x_offset += private->x;
tmp_paint.y_offset += private->y;
return gdk_window_get_bg_gc (GDK_WINDOW (private->parent), &tmp_paint);
}
else if (private->bg_pixmap &&
private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
private->bg_pixmap != GDK_NO_BG)
{
gc_values.fill = GDK_TILED;
gc_values.tile = private->bg_pixmap;
gc_values.ts_x_origin = - paint->x_offset;
gc_values.ts_y_origin = - paint->y_offset;
gc_mask = (GDK_GC_FILL | GDK_GC_TILE |
GDK_GC_TS_X_ORIGIN | GDK_GC_TS_Y_ORIGIN);
}
else
{
gc_values.foreground = private->bg_color;
gc_mask = GDK_GC_FOREGROUND;
}
return gdk_gc_new_with_values (paint->pixmap, &gc_values, gc_mask);
}
static void
gdk_window_paint_init_bg (GdkWindow *window,
GdkWindowPaint *paint,
GdkRegion *init_region)
{
GdkGC *tmp_gc;
tmp_gc = gdk_window_get_bg_gc (window, paint);
gdk_region_offset (init_region,
- paint->x_offset,
- paint->y_offset);
gdk_gc_set_clip_region (tmp_gc, init_region);
gdk_draw_rectangle (paint->pixmap, tmp_gc, TRUE, 0, 0, -1, -1);
gdk_gc_unref (tmp_gc);
}
#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;
GdkRegion *init_region;
GdkGC *tmp_gc;
g_return_if_fail (window != NULL);
g_return_if_fail (GDK_IS_WINDOW (window));
if (GDK_WINDOW_DESTROYED (window))
return;
paint = g_new (GdkWindowPaint, 1);
paint->region = gdk_region_copy (region);
init_region = gdk_region_copy (region);
gdk_region_get_clipbox (paint->region, &clip_box);
if (private->paint_stack)
{
gint old_width, old_height;
GdkWindowPaint *tmp_paint = private->paint_stack->data;
GdkRectangle old_rect, new_rect;
GSList *tmp_list;
gdk_drawable_get_size (tmp_paint->pixmap, &old_width, &old_height);
old_rect.x = tmp_paint->x_offset;
old_rect.y = tmp_paint->y_offset;
old_rect.width = old_width;
old_rect.height = old_height;
gdk_rectangle_union (&clip_box, &old_rect, &new_rect);
if (new_rect.width > old_rect.width || new_rect.height > old_rect.height)
{
paint->pixmap = gdk_pixmap_new (window,
new_rect.width, new_rect.height, -1);
tmp_gc = gdk_gc_new (paint->pixmap);
gdk_draw_drawable (paint->pixmap, tmp_gc, tmp_paint->pixmap,
0, 0,
old_rect.x - new_rect.x, old_rect.y - new_rect.y,
old_rect.width, old_rect.height);
gdk_gc_unref (tmp_gc);
gdk_drawable_unref (tmp_paint->pixmap);
paint->x_offset = new_rect.x;
paint->y_offset = new_rect.y;
tmp_list = private->paint_stack;
while (tmp_list)
{
tmp_paint = tmp_list->data;
gdk_region_subtract (init_region, tmp_paint->region);
tmp_paint->pixmap = paint->pixmap;
tmp_paint->x_offset = paint->x_offset;
tmp_paint->y_offset = paint->y_offset;
tmp_list = tmp_list->next;
}
}
else
{
paint->x_offset = tmp_paint->x_offset;
paint->y_offset = tmp_paint->y_offset;
paint->pixmap = tmp_paint->pixmap;
tmp_list = private->paint_stack;
while (tmp_list)
{
tmp_paint = tmp_list->data;
gdk_region_subtract (init_region, tmp_paint->region);
tmp_list = tmp_list->next;
}
}
}
else
{
paint->x_offset = clip_box.x;
paint->y_offset = clip_box.y;
paint->pixmap = gdk_pixmap_new (window,
clip_box.width, clip_box.height, -1);
}
if (!gdk_region_empty (init_region))
gdk_window_paint_init_bg (window, paint, init_region);
gdk_region_destroy (init_region);
private->paint_stack = g_slist_prepend (private->paint_stack, paint);
#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 (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_gc_new (window);
_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);
gdk_gc_unref (tmp_gc);
if (private->paint_stack)
{
GSList *tmp_list = private->paint_stack;
while (tmp_list)
{
GdkWindowPaint *tmp_paint = tmp_list->data;
gdk_region_subtract (tmp_paint->region, paint->region);
tmp_list = tmp_list->next;
}
}
else
gdk_drawable_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)
gdk_drawable_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,
gint 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,
gint 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,
gint 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 *window,
gint x,
gint y,
gint width,
gint height,
gint *composite_x_offset,
gint *composite_y_offset)
{
GdkWindowObject *private = (GdkWindowObject *)window;
GdkWindowPaint *paint;
GdkRegion *buffered_region;
GSList *tmp_list;
GdkPixmap *buffer;
GdkPixmap *tmp_pixmap;
GdkRectangle rect;
GdkRegion *rect_region;
GdkGC *tmp_gc;
gint windowing_x_offset, windowing_y_offset;
gint buffer_x_offset, buffer_y_offset;
if (GDK_WINDOW_DESTROYED (window) || private->paint_stack == NULL)
{
/* No backing store */
_gdk_windowing_window_get_offsets (window,
composite_x_offset,
composite_y_offset);
return GDK_DRAWABLE (g_object_ref (G_OBJECT (window)));
}
buffered_region = NULL;
buffer = NULL;
/* All GtkWindowPaint structs have the same pixmap and offsets, just
* get the first one. (should probably be cleaned up so that the
* pixmap is stored in the window)
*/
paint = private->paint_stack->data;
buffer = paint->pixmap;
buffer_x_offset = paint->x_offset;
buffer_y_offset = paint->y_offset;
tmp_list = private->paint_stack;
while (tmp_list != NULL)
{
paint = tmp_list->data;
if (buffered_region == NULL)
buffered_region = gdk_region_copy (paint->region);
else
gdk_region_union (buffered_region, paint->region);
tmp_list = g_slist_next (tmp_list);
}
/* 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;
rect_region = gdk_region_rectangle (&rect);
gdk_region_intersect (buffered_region, rect_region);
gdk_region_destroy (rect_region);
if (gdk_region_empty (buffered_region))
{
gdk_region_destroy (buffered_region);
_gdk_windowing_window_get_offsets (window,
composite_x_offset,
composite_y_offset);
return GDK_DRAWABLE (g_object_ref (G_OBJECT (window)));
}
tmp_pixmap = gdk_pixmap_new (window,
width, height,
-1);
tmp_gc = gdk_gc_new (tmp_pixmap);
_gdk_windowing_window_get_offsets (window,
&windowing_x_offset,
&windowing_y_offset);
/* Copy the current window contents */
gdk_draw_drawable (tmp_pixmap,
tmp_gc,
private->impl,
x - windowing_x_offset,
y - windowing_y_offset,
0, 0,
width, height);
/* Make buffered_region relative to the tmp_pixmap */
gdk_region_offset (buffered_region,
- x,
- y);
/* Set the clip mask to avoid drawing over non-buffered areas of
* tmp_pixmap.
*/
gdk_gc_set_clip_region (tmp_gc, buffered_region);
gdk_region_destroy (buffered_region);
/* Draw backing pixmap onto the tmp_pixmap, offsetting
* appropriately.
*/
gdk_draw_drawable (tmp_pixmap,
tmp_gc,
buffer,
x - buffer_x_offset,
y - buffer_y_offset,
0, 0,
width, height);
/* Set these to location of tmp_pixmap within the window */
*composite_x_offset = x;
*composite_y_offset = y;
g_object_unref (G_OBJECT (tmp_gc));
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);
}
/* Fixme - this is just like gdk_window_paint_init_bg */
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;
GdkGC *tmp_gc;
if (GDK_WINDOW_DESTROYED (window))
return;
tmp_gc = gdk_window_get_bg_gc (window, paint);
gdk_draw_rectangle (paint->pixmap, tmp_gc, TRUE,
x - paint->x_offset, y - paint->y_offset, width, height);
gdk_gc_unref (tmp_gc);
}
/**
* 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_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)
{
gint depth;
g_return_val_if_fail (GDK_IS_WINDOW (drawable), 0);
depth = ((GdkWindowObject *)GDK_WINDOW (drawable))->depth;
if (depth == 0)
{
g_print ("0 depth for type %s\n", g_type_name (G_OBJECT_TYPE (drawable)));
G_BREAKPOINT ();
}
return depth;
}
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);
}
/* Code for dirty-region queueing
*/
static GSList *update_windows = NULL;
static guint update_idle = 0;
static gboolean debug_updates = FALSE;
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))
{
GdkEvent event;
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_flush ();
g_usleep (70000);
}
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;
save_region = _gdk_windowing_window_queue_antiexpose (window, update_area);
event.expose.type = GDK_EXPOSE;
event.expose.window = gdk_window_ref (window);
event.expose.count = 0;
if (save_region)
expose_region = gdk_region_copy (update_area);
else
expose_region = update_area;
window_region = gdk_region_rectangle (&window_rect);
gdk_region_intersect (expose_region,
window_region);
gdk_region_destroy (window_region);
event.expose.region = expose_region;
gdk_region_get_clipbox (expose_region, &event.expose.area);
if (!gdk_region_empty (expose_region))
{
(*_gdk_event_func) (&event, _gdk_event_data);
}
if (expose_region != update_area)
gdk_region_destroy (expose_region);
gdk_window_unref (window);
}
if (!save_region)
gdk_region_destroy (update_area);
}
}
/**
* 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;
while (tmp_list)
{
gdk_window_process_updates_internal (tmp_list->data);
tmp_list = tmp_list->next;
}
g_slist_free (old_update_windows);
gdk_flush();
}
static gboolean
gdk_window_update_idle (gpointer data)
{
gdk_window_process_all_updates ();
return FALSE;
}
/**
* 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 (private->update_area)
{
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);
}
/**
* 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;
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;
visible_region = gdk_drawable_get_visible_region (window);
gdk_region_intersect (visible_region, region);
if (!gdk_region_empty (visible_region))
{
if (debug_updates)
{
/* Draw ugly color all over the newly-invalid region */
GdkRectangle ugly_rect;
GdkGC *ugly_gc;
GdkColor ugly_color = { 0, 60000, 10000, 10000 };
ugly_gc = gdk_gc_new (window);
gdk_gc_set_rgb_fg_color (ugly_gc, &ugly_color);
gdk_region_get_clipbox (visible_region, &ugly_rect);
gdk_draw_rectangle (window,
ugly_gc,
TRUE,
ugly_rect.x, ugly_rect.y,
ugly_rect.width, ugly_rect.height);
g_object_unref (G_OBJECT (ugly_gc));
}
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);
if (!private->update_freeze_count && !update_idle)
update_idle = g_idle_add_full (GDK_PRIORITY_REDRAW,
gdk_window_update_idle, NULL, NULL);
}
if (child_func)
{
GList *tmp_list;
tmp_list = private->children;
while (tmp_list)
{
GdkWindowObject *child = tmp_list->data;
tmp_list = tmp_list->next;
if (!child->input_only && (*child_func) ((GdkWindow *)child, user_data))
{
GdkRegion *child_region;
gint x, y;
gdk_window_get_position ((GdkWindow *)child, &x, &y);
/* This copy could be saved with a little more complexity */
child_region = gdk_region_copy (visible_region);
gdk_region_offset (child_region, -x, -y);
gdk_window_invalidate_maybe_recurse ((GdkWindow *)child, child_region, child_func, user_data);
gdk_region_destroy (child_region);
}
}
}
}
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);
private->update_freeze_count--;
if (!private->update_freeze_count && private->update_area && !update_idle)
update_idle = g_idle_add_full (GDK_PRIORITY_REDRAW,
gdk_window_update_idle, NULL, NULL);
}
/**
* 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_set_pointer_hooks:
* @new_hooks: a table of pointers to functions for getting
* quantities related to the current pointer position,
* or %NULL to restore the default table.
*
* This function allows for hooking into the operation
* of getting the current location of the pointer. This
* is only useful for such low-level tools as an
* event recorder. Applications should never have any
* reason to use this facility
*
* Return value: the previous pointer hook table
**/
GdkPointerHooks *
gdk_set_pointer_hooks (const GdkPointerHooks *new_hooks)
{
const GdkPointerHooks *result = current_pointer_hooks;
if (new_hooks)
current_pointer_hooks = new_hooks;
else
current_pointer_hooks = &default_pointer_hooks;
return (GdkPointerHooks *)result;
}
/**
* 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 @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)
{
g_return_val_if_fail (window == NULL || GDK_IS_WINDOW (window), NULL);
return current_pointer_hooks->get_pointer (window, x, y, mask);
}
/**
* 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 (for example,
* belongs to another application).
*
* Return value: window under the mouse pointer
**/
GdkWindow*
gdk_window_at_pointer (gint *win_x,
gint *win_y)
{
return current_pointer_hooks->window_at_pointer (NULL, 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_parent_root;
}
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