gtk/gdk/gdkdraw.c
Benjamin Otte 4c16995868 gdk: remove get_composite_drawable vfunc
The vfunc is not used anymore.
2010-08-10 21:02:29 +02:00

346 lines
9.7 KiB
C

/* 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 <math.h>
#include <pango/pangocairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "gdkcairo.h"
#include "gdkdrawable.h"
#include "gdkinternals.h"
#include "gdkwindow.h"
#include "gdkscreen.h"
#include "gdkpixbuf.h"
static cairo_region_t * gdk_drawable_real_get_visible_region (GdkDrawable *drawable);
G_DEFINE_ABSTRACT_TYPE (GdkDrawable, gdk_drawable, G_TYPE_OBJECT)
static void
gdk_drawable_class_init (GdkDrawableClass *klass)
{
/* Default implementation for clip and visible region is the same */
klass->get_clip_region = gdk_drawable_real_get_visible_region;
klass->get_visible_region = gdk_drawable_real_get_visible_region;
}
static void
gdk_drawable_init (GdkDrawable *drawable)
{
}
/* Manipulation of drawables
*/
/**
* gdk_drawable_get_size:
* @drawable: a #GdkDrawable
* @width: (out) (allow-none): location to store drawable's width, or %NULL
* @height: (out) (allow-none): location to store drawable's height, or %NULL
*
* Fills *@width and *@height with the size of @drawable.
* @width or @height can be %NULL if you only want the other one.
*
* On the X11 platform, if @drawable is a #GdkWindow, the returned
* size is the size reported in the most-recently-processed configure
* event, rather than the current size on the X server.
*
**/
void
gdk_drawable_get_size (GdkDrawable *drawable,
gint *width,
gint *height)
{
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
GDK_DRAWABLE_GET_CLASS (drawable)->get_size (drawable, width, height);
}
/**
* gdk_drawable_get_visual:
* @drawable: a #GdkDrawable
*
* Gets the #GdkVisual describing the pixel format of @drawable.
*
* Return value: a #GdkVisual
**/
GdkVisual*
gdk_drawable_get_visual (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_visual (drawable);
}
/**
* gdk_drawable_get_depth:
* @drawable: a #GdkDrawable
*
* Obtains the bit depth of the drawable, that is, the number of bits
* that make up a pixel in the drawable's visual. Examples are 8 bits
* per pixel, 24 bits per pixel, etc.
*
* Return value: number of bits per pixel
**/
gint
gdk_drawable_get_depth (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), 0);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_depth (drawable);
}
/**
* gdk_drawable_get_screen:
* @drawable: a #GdkDrawable
*
* Gets the #GdkScreen associated with a #GdkDrawable.
*
* Return value: the #GdkScreen associated with @drawable
*
* Since: 2.2
**/
GdkScreen*
gdk_drawable_get_screen(GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_screen (drawable);
}
/**
* gdk_drawable_get_display:
* @drawable: a #GdkDrawable
*
* Gets the #GdkDisplay associated with a #GdkDrawable.
*
* Return value: the #GdkDisplay associated with @drawable
*
* Since: 2.2
**/
GdkDisplay*
gdk_drawable_get_display (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return gdk_screen_get_display (gdk_drawable_get_screen (drawable));
}
/**
* gdk_drawable_set_colormap:
* @drawable: a #GdkDrawable
* @colormap: a #GdkColormap
*
* Sets the colormap associated with @drawable. Normally this will
* happen automatically when the drawable is created; you only need to
* use this function if the drawable-creating function did not have a
* way to determine the colormap, and you then use drawable operations
* that require a colormap. The colormap for all drawables and
* graphics contexts you intend to use together should match. i.e.
* when using a #GdkGC to draw to a drawable, or copying one drawable
* to another, the colormaps should match.
*
**/
void
gdk_drawable_set_colormap (GdkDrawable *drawable,
GdkColormap *cmap)
{
g_return_if_fail (GDK_IS_DRAWABLE (drawable));
g_return_if_fail (cmap == NULL || gdk_drawable_get_depth (drawable)
== cmap->visual->depth);
GDK_DRAWABLE_GET_CLASS (drawable)->set_colormap (drawable, cmap);
}
/**
* gdk_drawable_get_colormap:
* @drawable: a #GdkDrawable
*
* Gets the colormap for @drawable, if one is set; returns
* %NULL otherwise.
*
* Return value: the colormap, or %NULL
**/
GdkColormap*
gdk_drawable_get_colormap (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_colormap (drawable);
}
/**
* gdk_drawable_get_clip_region:
* @drawable: a #GdkDrawable
*
* Computes the region of a drawable that potentially can be written
* to by drawing primitives. This region will not take into account
* the clip region for the GC, and may also not take into account
* other factors such as if the window is obscured by other windows,
* but no area outside of this region will be affected by drawing
* primitives.
*
* Returns: a #cairo_region_t. This must be freed with cairo_region_destroy()
* when you are done.
**/
cairo_region_t *
gdk_drawable_get_clip_region (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_clip_region (drawable);
}
/**
* gdk_drawable_get_visible_region:
* @drawable: a #GdkDrawable
*
* Computes the region of a drawable that is potentially visible.
* This does not necessarily take into account if the window is
* obscured by other windows, but no area outside of this region
* is visible.
*
* Returns: a #cairo_region_t. This must be freed with cairo_region_destroy()
* when you are done.
**/
cairo_region_t *
gdk_drawable_get_visible_region (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->get_visible_region (drawable);
}
static cairo_region_t *
gdk_drawable_real_get_visible_region (GdkDrawable *drawable)
{
GdkRectangle rect;
rect.x = 0;
rect.y = 0;
gdk_drawable_get_size (drawable, &rect.width, &rect.height);
return cairo_region_create_rectangle (&rect);
}
/**
* _gdk_drawable_ref_cairo_surface:
* @drawable: a #GdkDrawable
*
* Obtains a #cairo_surface_t for the given drawable. If a
* #cairo_surface_t for the drawable already exists, it will be
* referenced, otherwise a new surface will be created.
*
* Return value: a newly referenced #cairo_surface_t that points
* to @drawable. Unref with cairo_surface_destroy()
**/
cairo_surface_t *
_gdk_drawable_ref_cairo_surface (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
return GDK_DRAWABLE_GET_CLASS (drawable)->ref_cairo_surface (drawable);
}
/************************************************************************/
/**
* _gdk_drawable_get_subwindow_scratch_gc:
* @drawable: A #GdkDrawable
*
* Returns a #GdkGC suitable for drawing on @drawable. The #GdkGC has
* the standard values for @drawable, except for the graphics_exposures
* field which is %TRUE and the subwindow mode which is %GDK_INCLUDE_INFERIORS.
*
* The foreground color of the returned #GdkGC is undefined. The #GdkGC
* must not be altered in any way, except to change its foreground color.
*
* Return value: A #GdkGC suitable for drawing on @drawable
*
* Since: 2.18
**/
GdkGC *
_gdk_drawable_get_subwindow_scratch_gc (GdkDrawable *drawable)
{
GdkScreen *screen;
gint depth;
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
screen = gdk_drawable_get_screen (drawable);
g_return_val_if_fail (!screen->closed, NULL);
depth = gdk_drawable_get_depth (drawable) - 1;
if (!screen->subwindow_gcs[depth])
{
GdkGCValues values;
GdkGCValuesMask mask;
values.graphics_exposures = TRUE;
values.subwindow_mode = GDK_INCLUDE_INFERIORS;
mask = GDK_GC_EXPOSURES | GDK_GC_SUBWINDOW;
screen->subwindow_gcs[depth] =
gdk_gc_new_with_values (drawable, &values, mask);
}
return screen->subwindow_gcs[depth];
}
/*
* _gdk_drawable_get_source_drawable:
* @drawable: a #GdkDrawable
*
* Returns a drawable for the passed @drawable that is guaranteed to be
* usable to create a pixmap (e.g.: not an offscreen window).
*
* Since: 2.16
*/
GdkDrawable *
_gdk_drawable_get_source_drawable (GdkDrawable *drawable)
{
g_return_val_if_fail (GDK_IS_DRAWABLE (drawable), NULL);
if (GDK_DRAWABLE_GET_CLASS (drawable)->get_source_drawable)
return GDK_DRAWABLE_GET_CLASS (drawable)->get_source_drawable (drawable);
return drawable;
}
cairo_surface_t *
_gdk_drawable_create_cairo_surface (GdkDrawable *drawable,
int width,
int height)
{
return GDK_DRAWABLE_GET_CLASS (drawable)->create_cairo_surface (drawable,
width, height);
}