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gtk/gdk/gdkimage.c
CST 1999 Shawn T. Amundson 279e878bdd Added notice to look in AUTHORS and ChangeLog files for a list of changes. 
Wed Feb 24 01:22:39 CST 1999 Shawn T. Amundson <amundson@gtk.org>

        * *.[ch]: Added notice to look in AUTHORS and ChangeLog files
	  for a list of changes.
1999-02-24 07:37:18 +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 Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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 1997-1999. 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>
/* gcc -ansi -pedantic on GNU/Linux causes warnings and errors
* unless this is defined:
* warning: #warning "Files using this header must be compiled with _SVID_SOURCE or _XOPEN_SOURCE"
*/
#ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 1
#endif
#include <stdlib.h>
#include <sys/types.h>
#if defined (HAVE_IPC_H) && defined (HAVE_SHM_H) && defined (HAVE_XSHM_H)
#define USE_SHM
#endif
#ifdef USE_SHM
#include <sys/ipc.h>
#include <sys/shm.h>
#endif /* USE_SHM */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#ifdef USE_SHM
#include <X11/extensions/XShm.h>
#endif /* USE_SHM */
#include "gdk.h"
#include "gdkprivate.h"
static void gdk_image_put_normal (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height);
static void gdk_image_put_shared (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height);
static GList *image_list = NULL;
void
gdk_image_exit (void)
{
GdkImage *image;
while (image_list)
{
image = image_list->data;
gdk_image_destroy (image);
}
}
GdkImage *
gdk_image_new_bitmap(GdkVisual *visual, gpointer data, gint w, gint h)
/*
* Desc: create a new bitmap image
*/
{
Visual *xvisual;
GdkImage *image;
GdkImagePrivate *private;
private = g_new(GdkImagePrivate, 1);
image = (GdkImage *) private;
private->xdisplay = gdk_display;
private->image_put = gdk_image_put_normal;
image->type = GDK_IMAGE_NORMAL;
image->visual = visual;
image->width = w;
image->height = h;
image->depth = 1;
xvisual = ((GdkVisualPrivate*) visual)->xvisual;
private->ximage = XCreateImage(private->xdisplay, xvisual, 1, XYBitmap,
0, 0, w ,h, 8, 0);
private->ximage->data = data;
private->ximage->bitmap_bit_order = MSBFirst;
private->ximage->byte_order = MSBFirst;
image->byte_order = MSBFirst;
image->mem = private->ximage->data;
image->bpl = private->ximage->bytes_per_line;
image->bpp = 1;
return(image);
} /* gdk_image_new_bitmap() */
static int
gdk_image_check_xshm(Display *display)
/*
* Desc: query the server for support for the MIT_SHM extension
* Return: 0 = not available
* 1 = shared XImage support available
* 2 = shared Pixmap support available also
*/
{
#ifdef USE_SHM
int major, minor, ignore;
Bool pixmaps;
if (XQueryExtension(display, "MIT-SHM", &ignore, &ignore, &ignore))
{
if (XShmQueryVersion(display, &major, &minor, &pixmaps )==True)
{
return (pixmaps==True) ? 2 : 1;
}
}
#endif /* USE_SHM */
return 0;
}
void
gdk_image_init (void)
{
if (gdk_use_xshm)
{
if (!gdk_image_check_xshm (gdk_display))
{
gdk_use_xshm = False;
}
}
}
GdkImage*
gdk_image_new (GdkImageType type,
GdkVisual *visual,
gint width,
gint height)
{
GdkImage *image;
GdkImagePrivate *private;
#ifdef USE_SHM
XShmSegmentInfo *x_shm_info;
#endif /* USE_SHM */
Visual *xvisual;
switch (type)
{
case GDK_IMAGE_FASTEST:
image = gdk_image_new (GDK_IMAGE_SHARED, visual, width, height);
if (!image)
image = gdk_image_new (GDK_IMAGE_NORMAL, visual, width, height);
break;
default:
private = g_new (GdkImagePrivate, 1);
image = (GdkImage*) private;
private->xdisplay = gdk_display;
private->image_put = NULL;
image->type = type;
image->visual = visual;
image->width = width;
image->height = height;
image->depth = visual->depth;
xvisual = ((GdkVisualPrivate*) visual)->xvisual;
switch (type)
{
case GDK_IMAGE_SHARED:
#ifdef USE_SHM
if (gdk_use_xshm)
{
private->image_put = gdk_image_put_shared;
private->x_shm_info = g_new (XShmSegmentInfo, 1);
x_shm_info = private->x_shm_info;
private->ximage = XShmCreateImage (private->xdisplay, xvisual, visual->depth,
ZPixmap, NULL, x_shm_info, width, height);
if (private->ximage == NULL)
{
g_warning ("XShmCreateImage failed");
g_free (image);
gdk_use_xshm = False;
return NULL;
}
x_shm_info->shmid = shmget (IPC_PRIVATE,
private->ximage->bytes_per_line * private->ximage->height,
IPC_CREAT | 0777);
if (x_shm_info->shmid == -1)
{
g_warning ("shmget failed!");
XDestroyImage (private->ximage);
g_free (private->x_shm_info);
g_free (image);
gdk_use_xshm = False;
return NULL;
}
x_shm_info->readOnly = False;
x_shm_info->shmaddr = shmat (x_shm_info->shmid, 0, 0);
private->ximage->data = x_shm_info->shmaddr;
if (x_shm_info->shmaddr == (char*) -1)
{
g_warning ("shmat failed!");
XDestroyImage (private->ximage);
shmctl (x_shm_info->shmid, IPC_RMID, 0);
g_free (private->x_shm_info);
g_free (image);
return NULL;
}
gdk_error_code = 0;
gdk_error_warnings = 0;
XShmAttach (private->xdisplay, x_shm_info);
XSync (private->xdisplay, False);
gdk_error_warnings = 1;
if (gdk_error_code == -1)
{
/* this is the common failure case so omit warning */
XDestroyImage (private->ximage);
shmdt (x_shm_info->shmaddr);
shmctl (x_shm_info->shmid, IPC_RMID, 0);
g_free (private->x_shm_info);
g_free (image);
gdk_use_xshm = False;
return NULL;
}
/* We mark the segment as destroyed so that when
* the last process detaches, it will be deleted.
* There is a small possibility of leaking if
* we die in XShmAttach. In theory, a signal handler
* could be set up.
*/
shmctl (x_shm_info->shmid, IPC_RMID, 0);
if (image)
image_list = g_list_prepend (image_list, image);
}
else
{
g_free (image);
return NULL;
}
break;
#else /* USE_SHM */
g_free (image);
return NULL;
#endif /* USE_SHM */
case GDK_IMAGE_NORMAL:
private->image_put = gdk_image_put_normal;
private->ximage = XCreateImage (private->xdisplay, xvisual, visual->depth,
ZPixmap, 0, 0, width, height, 32, 0);
/* Use malloc, not g_malloc here, because X will call free()
* on this data
*/
private->ximage->data = malloc (private->ximage->bytes_per_line *
private->ximage->height);
break;
case GDK_IMAGE_FASTEST:
g_assert_not_reached ();
}
if (image)
{
image->byte_order = private->ximage->byte_order;
image->mem = private->ximage->data;
image->bpl = private->ximage->bytes_per_line;
switch (private->ximage->bits_per_pixel)
{
case 8:
image->bpp = 1;
break;
case 16:
image->bpp = 2;
break;
case 24:
image->bpp = 3;
break;
case 32:
image->bpp = 4;
break;
}
}
}
return image;
}
GdkImage*
gdk_image_get (GdkWindow *window,
gint x,
gint y,
gint width,
gint height)
{
GdkImage *image;
GdkImagePrivate *private;
GdkWindowPrivate *win_private;
g_return_val_if_fail (window != NULL, NULL);
win_private = (GdkWindowPrivate *) window;
if (win_private->destroyed)
return NULL;
private = g_new (GdkImagePrivate, 1);
image = (GdkImage*) private;
private->xdisplay = gdk_display;
private->image_put = gdk_image_put_normal;
private->ximage = XGetImage (private->xdisplay,
win_private->xwindow,
x, y, width, height,
AllPlanes, ZPixmap);
image->type = GDK_IMAGE_NORMAL;
image->visual = gdk_window_get_visual (window);
image->width = width;
image->height = height;
image->depth = private->ximage->depth;
image->mem = private->ximage->data;
image->bpl = private->ximage->bytes_per_line;
image->bpp = private->ximage->bits_per_pixel;
image->byte_order = private->ximage->byte_order;
return image;
}
guint32
gdk_image_get_pixel (GdkImage *image,
gint x,
gint y)
{
guint32 pixel;
GdkImagePrivate *private;
g_return_val_if_fail (image != NULL, 0);
private = (GdkImagePrivate *) image;
pixel = XGetPixel (private->ximage, x, y);
return pixel;
}
void
gdk_image_put_pixel (GdkImage *image,
gint x,
gint y,
guint32 pixel)
{
GdkImagePrivate *private;
g_return_if_fail (image != NULL);
private = (GdkImagePrivate *) image;
pixel = XPutPixel (private->ximage, x, y, pixel);
}
void
gdk_image_destroy (GdkImage *image)
{
GdkImagePrivate *private;
#ifdef USE_SHM
XShmSegmentInfo *x_shm_info;
#endif /* USE_SHM */
g_return_if_fail (image != NULL);
private = (GdkImagePrivate*) image;
switch (image->type)
{
case GDK_IMAGE_NORMAL:
XDestroyImage (private->ximage);
break;
case GDK_IMAGE_SHARED:
#ifdef USE_SHM
gdk_flush();
XShmDetach (private->xdisplay, private->x_shm_info);
XDestroyImage (private->ximage);
x_shm_info = private->x_shm_info;
shmdt (x_shm_info->shmaddr);
g_free (private->x_shm_info);
image_list = g_list_remove (image_list, image);
#else /* USE_SHM */
g_error ("trying to destroy shared memory image when gdk was compiled without shared memory support");
#endif /* USE_SHM */
break;
case GDK_IMAGE_FASTEST:
g_assert_not_reached ();
}
g_free (image);
}
static void
gdk_image_put_normal (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height)
{
GdkWindowPrivate *drawable_private;
GdkImagePrivate *image_private;
GdkGCPrivate *gc_private;
g_return_if_fail (drawable != NULL);
g_return_if_fail (image != NULL);
g_return_if_fail (gc != NULL);
drawable_private = (GdkWindowPrivate*) drawable;
if (drawable_private->destroyed)
return;
image_private = (GdkImagePrivate*) image;
gc_private = (GdkGCPrivate*) gc;
g_return_if_fail (image->type == GDK_IMAGE_NORMAL);
XPutImage (drawable_private->xdisplay, drawable_private->xwindow,
gc_private->xgc, image_private->ximage,
xsrc, ysrc, xdest, ydest, width, height);
}
static void
gdk_image_put_shared (GdkDrawable *drawable,
GdkGC *gc,
GdkImage *image,
gint xsrc,
gint ysrc,
gint xdest,
gint ydest,
gint width,
gint height)
{
#ifdef USE_SHM
GdkWindowPrivate *drawable_private;
GdkImagePrivate *image_private;
GdkGCPrivate *gc_private;
g_return_if_fail (drawable != NULL);
g_return_if_fail (image != NULL);
g_return_if_fail (gc != NULL);
drawable_private = (GdkWindowPrivate*) drawable;
if (drawable_private->destroyed)
return;
image_private = (GdkImagePrivate*) image;
gc_private = (GdkGCPrivate*) gc;
g_return_if_fail (image->type == GDK_IMAGE_SHARED);
XShmPutImage (drawable_private->xdisplay, drawable_private->xwindow,
gc_private->xgc, image_private->ximage,
xsrc, ysrc, xdest, ydest, width, height, False);
#else /* USE_SHM */
g_error ("trying to draw shared memory image when gdk was compiled without shared memory support");
#endif /* USE_SHM */
}
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