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SDL_x11framebuffer.c
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SDL_x11framebuffer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2011 Sam Lantinga
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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_x11video.h"
#include "SDL_x11framebuffer.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 ) {
shm_error = True;
return(0);
} else
return(X_handler(d,e));
}
static SDL_bool have_mitshm(void)
{
/* Only use shared memory on local X servers */
if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) ||
(SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) {
return SDL_X11_HAVE_SHM;
}
return SDL_FALSE;
}
#endif /* !NO_SHARED_MEMORY */
int
X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
void ** pixels, int *pitch)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
Display *display = data->videodata->display;
XGCValues gcv;
XVisualInfo vinfo;
/* Free the old framebuffer surface */
X11_DestroyWindowFramebuffer(_this, window);
/* Create the graphics context for drawing */
gcv.graphics_exposures = False;
data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv);
if (!data->gc) {
SDL_SetError("Couldn't create graphics context");
return -1;
}
/* Find out the pixel format and depth */
if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) {
SDL_SetError("Couldn't get window visual information");
return -1;
}
*format = X11_GetPixelFormatFromVisualInfo(display, &vinfo);
if (*format == SDL_PIXELFORMAT_UNKNOWN) {
SDL_SetError("Unknown window pixel format");
return -1;
}
/* Calculate pitch */
*pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
/* Create the actual image */
#ifndef NO_SHARED_MEMORY
if (have_mitshm()) {
XShmSegmentInfo *shminfo = &data->shminfo;
shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*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;
X_handler = XSetErrorHandler(shm_errhandler);
XShmAttach(display, shminfo);
XSync(display, True);
XSetErrorHandler(X_handler);
if ( shm_error )
shmdt(shminfo->shmaddr);
} else {
shm_error = True;
}
shmctl(shminfo->shmid, IPC_RMID, NULL);
} else {
shm_error = True;
}
if (!shm_error) {
data->ximage = XShmCreateImage(display, data->visual,
vinfo.depth, ZPixmap,
shminfo->shmaddr, shminfo,
window->w, window->h);
if (!data->ximage) {
XShmDetach(display, shminfo);
XSync(display, False);
shmdt(shminfo->shmaddr);
} else {
/* Done! */
data->use_mitshm = SDL_TRUE;
*pixels = shminfo->shmaddr;
return 0;
}
}
}
#endif /* not NO_SHARED_MEMORY */
*pixels = SDL_malloc(window->h*(*pitch));
if (*pixels == NULL) {
SDL_OutOfMemory();
return -1;
}
data->ximage = XCreateImage(display, data->visual,
vinfo.depth, ZPixmap, 0, (char *)(*pixels),
window->w, window->h, 32, 0);
if (!data->ximage) {
SDL_free(*pixels);
SDL_SetError("Couldn't create XImage");
return -1;
}
return 0;
}
int
X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window, SDL_Rect * rects,
int numrects)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
Display *display = data->videodata->display;
int i;
SDL_Rect *rect;
#ifndef NO_SHARED_MEMORY
if (data->use_mitshm) {
for (i = 0; i < numrects; ++i) {
rect = &rects[i];
if (rect->w == 0 || rect->h == 0) { /* Clipped? */
continue;
}
XShmPutImage(display, data->xwindow, data->gc, data->ximage,
rect->x, rect->y,
rect->x, rect->y, rect->w, rect->h, False);
}
}
else
#endif /* !NO_SHARED_MEMORY */
{
for (i = 0; i < numrects; ++i) {
rect = &rects[i];
if (rect->w == 0 || rect->h == 0) { /* Clipped? */
continue;
}
XPutImage(display, data->xwindow, data->gc, data->ximage,
rect->x, rect->y,
rect->x, rect->y, rect->w, rect->h);
}
}
XSync(display, False);
}
void
X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
Display *display = data->videodata->display;
if (data->ximage) {
XDestroyImage(data->ximage);
#ifndef NO_SHARED_MEMORY
if (data->use_mitshm) {
XShmDetach(display, &data->shminfo);
XSync(display, False);
shmdt(data->shminfo.shmaddr);
data->use_mitshm = SDL_FALSE;
}
#endif /* !NO_SHARED_MEMORY */
data->ximage = NULL;
}
if (data->gc) {
XFreeGC(display, data->gc);
data->gc = NULL;
}
}
/* vi: set ts=4 sw=4 expandtab: */