mirror of https://github.com/GNOME/gimp.git
298 lines
7.3 KiB
C
298 lines
7.3 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <errno.h>
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#if defined(USE_SYSV_SHM)
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#ifdef HAVE_IPC_H
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#include <sys/ipc.h>
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#endif
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#ifdef HAVE_SHM_H
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#include <sys/shm.h>
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#endif
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#elif defined(USE_POSIX_SHM)
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/mman.h>
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#endif /* USE_POSIX_SHM */
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#include <glib-object.h>
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#if defined(G_OS_WIN32) || defined(G_WITH_CYGWIN)
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#define STRICT
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#include <windows.h>
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#include <process.h>
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#ifdef G_OS_WIN32
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#include <fcntl.h>
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#include <io.h>
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#endif
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#define USE_WIN32_SHM 1
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#endif /* G_OS_WIN32 || G_WITH_CYGWIN */
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#include "plug-in-types.h"
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#include "base/tile.h"
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#include "core/gimp.h"
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#include "plug-in-shm.h"
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struct _PlugInShm
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{
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gint shm_ID;
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guchar *shm_addr;
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#if defined(USE_WIN32_SHM)
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HANDLE shm_handle;
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#endif
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};
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#define TILE_MAP_SIZE (TILE_WIDTH * TILE_HEIGHT * 4)
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#define ERRMSG_SHM_DISABLE "Disabling shared memory tile transport"
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void
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plug_in_shm_init (Gimp *gimp)
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{
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/* allocate a piece of shared memory for use in transporting tiles
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* to plug-ins. if we can't allocate a piece of shared memory then
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* we'll fall back on sending the data over the pipe.
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*/
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#if defined(USE_SYSV_SHM)
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/* Use SysV shared memory mechanisms for transferring tile data. */
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g_return_if_fail (GIMP_IS_GIMP (gimp));
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gimp->plug_in_shm = g_new0 (PlugInShm, 1);
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gimp->plug_in_shm->shm_ID = -1;
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gimp->plug_in_shm->shm_ID = shmget (IPC_PRIVATE, TILE_MAP_SIZE,
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IPC_CREAT | 0600);
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if (gimp->plug_in_shm->shm_ID != -1)
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{
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gimp->plug_in_shm->shm_addr = (guchar *)
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shmat (gimp->plug_in_shm->shm_ID, NULL, 0);
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if (gimp->plug_in_shm->shm_addr == (guchar *) -1)
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{
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g_warning ("shmat() failed: %s\n" ERRMSG_SHM_DISABLE,
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g_strerror (errno));
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shmctl (gimp->plug_in_shm->shm_ID, IPC_RMID, NULL);
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gimp->plug_in_shm->shm_ID = -1;
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}
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#ifdef IPC_RMID_DEFERRED_RELEASE
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if (gimp->plug_in_shm->shm_addr != (guchar *) -1)
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shmctl (gimp->plug_in_shm->shm_ID, IPC_RMID, NULL);
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#endif
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}
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else
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{
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g_warning ("shmget() failed: %s\n" ERRMSG_SHM_DISABLE,
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g_strerror (errno));
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}
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#elif defined(USE_WIN32_SHM)
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/* Use Win32 shared memory mechanisms for transferring tile data. */
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gint pid;
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gchar fileMapName[MAX_PATH];
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g_return_if_fail (GIMP_IS_GIMP (gimp));
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gimp->plug_in_shm = g_new0 (PlugInShm, 1);
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gimp->plug_in_shm->shm_ID = -1;
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/* Our shared memory id will be our process ID */
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pid = GetCurrentProcessId ();
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/* From the id, derive the file map name */
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g_snprintf (fileMapName, sizeof (fileMapName), "GIMP%d.SHM", pid);
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/* Create the file mapping into paging space */
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gimp->plug_in_shm->shm_handle = CreateFileMapping ((HANDLE) 0xFFFFFFFF, NULL,
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PAGE_READWRITE, 0,
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TILE_MAP_SIZE,
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fileMapName);
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if (gimp->plug_in_shm->shm_handle)
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{
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/* Map the shared memory into our address space for use */
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gimp->plug_in_shm->shm_addr = (guchar *)
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MapViewOfFile (gimp->plug_in_shm->shm_handle,
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FILE_MAP_ALL_ACCESS,
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0, 0, TILE_MAP_SIZE);
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/* Verify that we mapped our view */
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if (gimp->plug_in_shm->shm_addr)
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gimp->plug_in_shm->shm_ID = pid;
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else
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g_warning ("MapViewOfFile error: %d... " ERRMSG_SHM_DISABLE,
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GetLastError ());
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}
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else
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{
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g_warning ("CreateFileMapping error: %d... " ERRMSG_SHM_DISABLE,
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GetLastError ());
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}
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#elif defined(USE_POSIX_SHM)
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/* Use POSIX shared memory mechanisms for transferring tile data. */
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gint pid;
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gchar shm_handle[32];
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gint shm_fd;
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g_return_if_fail (GIMP_IS_GIMP (gimp));
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gimp->plug_in_shm = g_new0 (PlugInShm, 1);
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gimp->plug_in_shm->shm_ID = -1;
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/* Our shared memory id will be our process ID */
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pid = getpid ();
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/* From the id, derive the file map name */
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g_snprintf (shm_handle, sizeof (shm_handle), "/gimp-shm-%d", pid);
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/* Create the file mapping into paging space */
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shm_fd = shm_open (shm_handle, O_RDWR | O_CREAT, 0600);
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if (shm_fd != -1)
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{
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if (ftruncate (shm_fd, TILE_MAP_SIZE) != -1)
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{
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/* Map the shared memory into our address space for use */
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gimp->plug_in_shm->shm_addr = (guchar *)
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mmap (NULL, TILE_MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
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shm_fd, 0);
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/* Verify that we mapped our view */
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if (gimp->plug_in_shm->shm_addr != MAP_FAILED)
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gimp->plug_in_shm->shm_ID = pid;
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else
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{
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g_warning ("mmap() failed: %s\n" ERRMSG_SHM_DISABLE,
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g_strerror (errno));
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shm_unlink (shm_handle);
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}
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}
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else
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{
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g_warning ("ftruncate() failed: %s\n" ERRMSG_SHM_DISABLE,
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g_strerror (errno));
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shm_unlink (shm_handle);
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}
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}
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else
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{
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g_warning ("shm_open() failed: %s\n" ERRMSG_SHM_DISABLE,
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g_strerror (errno));
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}
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#endif
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}
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void
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plug_in_shm_exit (Gimp *gimp)
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{
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g_return_if_fail (GIMP_IS_GIMP (gimp));
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g_return_if_fail (gimp->plug_in_shm != NULL);
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#if defined (USE_SYSV_SHM)
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#ifndef IPC_RMID_DEFERRED_RELEASE
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if (gimp->plug_in_shm->shm_ID != -1)
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{
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shmdt (gimp->plug_in_shm->shm_addr);
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shmctl (gimp->plug_in_shm->shm_ID, IPC_RMID, NULL);
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}
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#else /* IPC_RMID_DEFERRED_RELEASE */
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if (gimp->plug_in_shm->shm_ID != -1)
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{
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shmdt (gimp->plug_in_shm->shm_addr);
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}
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#endif
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#elif defined(USE_WIN32_SHM)
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if (gimp->plug_in_shm->shm_handle)
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{
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CloseHandle (gimp->plug_in_shm->shm_handle);
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}
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#elif defined(USE_POSIX_SHM)
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if (gimp->plug_in_shm->shm_ID != -1)
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{
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gchar shm_handle[32];
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munmap (gimp->plug_in_shm->shm_addr, TILE_MAP_SIZE);
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g_snprintf (shm_handle, sizeof (shm_handle), "/gimp-shm-%d",
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gimp->plug_in_shm->shm_ID);
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shm_unlink (shm_handle);
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}
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#endif
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g_free (gimp->plug_in_shm);
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gimp->plug_in_shm = NULL;
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}
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gint
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plug_in_shm_get_ID (Gimp *gimp)
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{
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g_return_val_if_fail (GIMP_IS_GIMP (gimp), -1);
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return gimp->plug_in_shm ? gimp->plug_in_shm->shm_ID : -1;
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}
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guchar *
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plug_in_shm_get_addr (Gimp *gimp)
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{
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g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
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g_return_val_if_fail (gimp->plug_in_shm != NULL, NULL);
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return gimp->plug_in_shm->shm_addr;
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}
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