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SDL_x11image.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include "SDL_endian.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_x11image_c.h"
#ifndef NO_SHARED_MEMORY
/* Shared memory error handler routine */
static int shm_error;
static int (*X_handler)(Display *, XErrorEvent *) = NULL;
static int shm_errhandler(Display *d, XErrorEvent *e)
{
if ( e->error_code == BadAccess ) {
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shm_error = True;
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return(0);
} else
return(X_handler(d,e));
}
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static void try_mitshm(_THIS, SDL_Surface *screen)
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{
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/* Dynamic X11 may not have SHM entry points on this box. */
if ((use_mitshm) && (!SDL_X11_HAVE_SHM))
use_mitshm = 0;
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if(!use_mitshm)
return;
shminfo.shmid = shmget(IPC_PRIVATE, screen->h*screen->pitch,
IPC_CREAT | 0777);
if ( shminfo.shmid >= 0 ) {
shminfo.shmaddr = (char *)shmat(shminfo.shmid, 0, 0);
shminfo.readOnly = False;
if ( shminfo.shmaddr != (char *)-1 ) {
shm_error = False;
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X_handler = XSetErrorHandler(shm_errhandler);
XShmAttach(SDL_Display, &shminfo);
XSync(SDL_Display, True);
XSetErrorHandler(X_handler);
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if ( shm_error )
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shmdt(shminfo.shmaddr);
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} else {
shm_error = True;
}
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shmctl(shminfo.shmid, IPC_RMID, NULL);
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} else {
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shm_error = True;
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}
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if ( shm_error )
use_mitshm = 0;
if ( use_mitshm )
screen->pixels = shminfo.shmaddr;
}
#endif /* ! NO_SHARED_MEMORY */
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/* Various screen update functions available */
static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);
static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects);
int X11_SetupImage(_THIS, SDL_Surface *screen)
{
#ifndef NO_SHARED_MEMORY
try_mitshm(this, screen);
if(use_mitshm) {
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SDL_Ximage = XShmCreateImage(SDL_Display, SDL_Visual,
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this->hidden->depth, ZPixmap,
shminfo.shmaddr, &shminfo,
screen->w, screen->h);
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if(!SDL_Ximage) {
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XShmDetach(SDL_Display, &shminfo);
XSync(SDL_Display, False);
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shmdt(shminfo.shmaddr);
screen->pixels = NULL;
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goto error;
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}
this->UpdateRects = X11_MITSHMUpdate;
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}
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if(!use_mitshm)
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#endif /* not NO_SHARED_MEMORY */
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{
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int bpp;
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screen->pixels = SDL_malloc(screen->h*screen->pitch);
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if ( screen->pixels == NULL ) {
SDL_OutOfMemory();
return -1;
}
bpp = screen->format->BytesPerPixel;
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SDL_Ximage = XCreateImage(SDL_Display, SDL_Visual,
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this->hidden->depth, ZPixmap, 0,
(char *)screen->pixels,
screen->w, screen->h,
32, 0);
if ( SDL_Ximage == NULL )
goto error;
/* XPutImage will convert byte sex automatically */
SDL_Ximage->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN)
? MSBFirst : LSBFirst;
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this->UpdateRects = X11_NormalUpdate;
}
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screen->pitch = SDL_Ximage->bytes_per_line;
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return(0);
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error:
SDL_SetError("Couldn't create XImage");
return 1;
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}
void X11_DestroyImage(_THIS, SDL_Surface *screen)
{
if ( SDL_Ximage ) {
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XDestroyImage(SDL_Ximage);
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#ifndef NO_SHARED_MEMORY
if ( use_mitshm ) {
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XShmDetach(SDL_Display, &shminfo);
XSync(SDL_Display, False);
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shmdt(shminfo.shmaddr);
}
#endif /* ! NO_SHARED_MEMORY */
SDL_Ximage = NULL;
}
if ( screen ) {
screen->pixels = NULL;
}
}
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/* Determine the number of CPUs in the system */
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static int num_CPU(void)
{
static int num_cpus = 0;
if(!num_cpus) {
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#if defined(__LINUX__)
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char line[BUFSIZ];
FILE *pstat = fopen("/proc/stat", "r");
if ( pstat ) {
while ( fgets(line, sizeof(line), pstat) ) {
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if (SDL_memcmp(line, "cpu", 3) == 0 && line[3] != ' ') {
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++num_cpus;
}
}
fclose(pstat);
}
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#elif defined(__IRIX__)
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num_cpus = sysconf(_SC_NPROC_ONLN);
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#elif defined(_SC_NPROCESSORS_ONLN)
/* number of processors online (SVR4.0MP compliant machines) */
num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(_SC_NPROCESSORS_CONF)
/* number of processors configured (SVR4.0MP compliant machines) */
num_cpus = sysconf(_SC_NPROCESSORS_CONF);
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#endif
if ( num_cpus <= 0 ) {
num_cpus = 1;
}
}
return num_cpus;
}
int X11_ResizeImage(_THIS, SDL_Surface *screen, Uint32 flags)
{
int retval;
X11_DestroyImage(this, screen);
if ( flags & SDL_OPENGL ) { /* No image when using GL */
retval = 0;
} else {
retval = X11_SetupImage(this, screen);
/* We support asynchronous blitting on the display */
if ( flags & SDL_ASYNCBLIT ) {
/* This is actually slower on single-CPU systems,
probably because of CPU contention between the
X server and the application.
Note: Is this still true with XFree86 4.0?
*/
if ( num_CPU() > 1 ) {
screen->flags |= SDL_ASYNCBLIT;
}
}
}
return(retval);
}
/* We don't actually allow hardware surfaces other than the main one */
int X11_AllocHWSurface(_THIS, SDL_Surface *surface)
{
return(-1);
}
void X11_FreeHWSurface(_THIS, SDL_Surface *surface)
{
return;
}
int X11_LockHWSurface(_THIS, SDL_Surface *surface)
{
if ( (surface == SDL_VideoSurface) && blit_queued ) {
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XSync(GFX_Display, False);
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blit_queued = 0;
}
return(0);
}
void X11_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
return;
}
int X11_FlipHWSurface(_THIS, SDL_Surface *surface)
{
return(0);
}
static void X11_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
{
int i;
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for (i = 0; i < numrects; ++i) {
if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */
continue;
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}
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XPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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rects[i].x, rects[i].y,
rects[i].x, rects[i].y, rects[i].w, rects[i].h);
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}
if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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XFlush(GFX_Display);
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blit_queued = 1;
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} else {
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XSync(GFX_Display, False);
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}
}
static void X11_MITSHMUpdate(_THIS, int numrects, SDL_Rect *rects)
{
#ifndef NO_SHARED_MEMORY
int i;
for ( i=0; i<numrects; ++i ) {
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if ( rects[i].w == 0 || rects[i].h == 0 ) { /* Clipped? */
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continue;
}
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XShmPutImage(GFX_Display, SDL_Window, SDL_GC, SDL_Ximage,
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rects[i].x, rects[i].y,
rects[i].x, rects[i].y, rects[i].w, rects[i].h,
False);
}
if ( SDL_VideoSurface->flags & SDL_ASYNCBLIT ) {
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XFlush(GFX_Display);
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blit_queued = 1;
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} else {
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XSync(GFX_Display, False);
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}
#endif /* ! NO_SHARED_MEMORY */
}
/* There's a problem with the automatic refreshing of the display.
Even though the XVideo code uses the GFX_Display to update the
video memory, it appears that updating the window asynchronously
from a different thread will cause "blackouts" of the window.
This is a sort of a hacked workaround for the problem.
*/
static int enable_autorefresh = 1;
void X11_DisableAutoRefresh(_THIS)
{
--enable_autorefresh;
}
void X11_EnableAutoRefresh(_THIS)
{
++enable_autorefresh;
}
void X11_RefreshDisplay(_THIS)
{
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/* Don't refresh a display that doesn't have an image (like GL)
Instead, post an expose event so the application can refresh.
*/
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if ( ! SDL_Ximage || (enable_autorefresh <= 0) ) {
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SDL_PrivateExpose();
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return;
}
#ifndef NO_SHARED_MEMORY
if ( this->UpdateRects == X11_MITSHMUpdate ) {
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XShmPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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0, 0, 0, 0, this->screen->w, this->screen->h,
False);
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} else
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#endif /* ! NO_SHARED_MEMORY */
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{
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XPutImage(SDL_Display, SDL_Window, SDL_GC, SDL_Ximage,
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0, 0, 0, 0, this->screen->w, this->screen->h);
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}
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XSync(SDL_Display, False);
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}