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Initial revision
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scottc
199
wrlib/xutil.c
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199
wrlib/xutil.c
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/* xutil.c - utility functions for X
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*
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* Raster graphics library
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*
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* Copyright (c) 1997 Alfredo K. Kojima
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#ifdef XSHM
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#endif /* XSHM */
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#include "wraster.h"
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#ifdef XSHM
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static int shmError;
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static int (*oldErrorHandler)();
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static int
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errorHandler(Display *dpy, XErrorEvent *err)
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{
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shmError=1;
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if(err->error_code!=BadAccess)
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(*oldErrorHandler)(dpy, err);
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return 0;
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}
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#endif
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RXImage*
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RCreateXImage(RContext *context, int depth, unsigned width, unsigned height)
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{
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RXImage *rximg;
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rximg = malloc(sizeof(RXImage));
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if (!rximg) {
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sprintf(RErrorString, "out of memory trying to create XImage");
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return NULL;
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}
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#ifndef XSHM
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rximg->image = XCreateImage(context->dpy, context->visual, depth,
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ZPixmap, 0, NULL, width, height, 8, 0);
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if (!rximg->image) {
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free(rximg);
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sprintf(RErrorString, "error creating XImage");
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return NULL;
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}
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rximg->image->data = malloc(rximg->image->bytes_per_line*height);
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if (!rximg->image->data) {
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XDestroyImage(rximg->image);
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free(rximg);
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sprintf(RErrorString, "out of memory trying to create XImage");
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return NULL;
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}
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#else /* XSHM */
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if (!context->attribs->use_shared_memory) {
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retry_without_shm:
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rximg->is_shared = 0;
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rximg->image = XCreateImage(context->dpy, context->visual, depth,
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ZPixmap, 0, NULL, width, height, 8, 0);
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if (!rximg->image) {
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free(rximg);
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sprintf(RErrorString, "error creating XImage");
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return NULL;
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}
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rximg->image->data = malloc(rximg->image->bytes_per_line*height);
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if (!rximg->image->data) {
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XDestroyImage(rximg->image);
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free(rximg);
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sprintf(RErrorString, "out of memory trying to create XImage");
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return NULL;
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}
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} else {
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rximg->is_shared = 1;
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rximg->image = XShmCreateImage(context->dpy, context->visual, depth,
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ZPixmap, NULL, &rximg->info, width,
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height);
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rximg->info.shmid = shmget(IPC_PRIVATE,
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rximg->image->bytes_per_line*height,
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IPC_CREAT|0770);
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if (rximg->info.shmid < 0) {
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context->attribs->use_shared_memory = 0;
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perror("wrlib:could not allocate shared memory segment:");
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XDestroyImage(rximg->image);
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goto retry_without_shm;
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}
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rximg->info.shmaddr = shmat(rximg->info.shmid, 0, 0);
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if (rximg->info.shmaddr == (void*)-1) {
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context->attribs->use_shared_memory = 0;
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if (shmctl(rximg->info.shmid, IPC_RMID, 0) < 0)
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perror("wrlib:shmctl:");
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perror("wrlib:could not allocate shared memory");
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XDestroyImage(rximg->image);
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goto retry_without_shm;
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}
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shmError = 0;
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XSync(context->dpy, False);
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oldErrorHandler = XSetErrorHandler(errorHandler);
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XShmAttach(context->dpy, &rximg->info);
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XSync(context->dpy, False);
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XSetErrorHandler(oldErrorHandler);
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rximg->image->data = rximg->info.shmaddr;
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/* rximg->image->obdata = &(rximg->info);*/
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if (shmError) {
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context->attribs->use_shared_memory = 0;
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XDestroyImage(rximg->image);
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if (shmdt(rximg->info.shmaddr) < 0)
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perror("wrlib:shmdt:");
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if (shmctl(rximg->info.shmid, IPC_RMID, 0) < 0)
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perror("wrlib:shmctl:");
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printf("wrlib:error attaching shared memory segment to XImage\n");
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goto retry_without_shm;
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}
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}
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#endif /* XSHM */
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return rximg;
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}
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void
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RDestroyXImage(RContext *context, RXImage *rximage)
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{
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#ifndef XSHM
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XDestroyImage(rximage->image);
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#else /* XSHM */
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if (rximage->is_shared) {
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XSync(context->dpy, False);
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XShmDetach(context->dpy, &rximage->info);
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XDestroyImage(rximage->image);
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if (shmdt(rximage->info.shmaddr) < 0)
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perror("wrlib:shmdt:");
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if (shmctl(rximage->info.shmid, IPC_RMID, 0) < 0)
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perror("wrlib:shmctl:");
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} else {
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XDestroyImage(rximage->image);
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}
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#endif
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free(rximage);
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}
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void
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RPutXImage(RContext *context, Drawable d, GC gc, RXImage *ximage, int src_x,
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int src_y, int dest_x, int dest_y,
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unsigned int width, unsigned int height)
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{
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#ifndef XSHM
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XPutImage(context->dpy, d, gc, ximage->image, src_x, src_y, dest_x,
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dest_y, width, height);
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#else
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if (ximage->is_shared) {
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XShmPutImage(context->dpy, d, gc, ximage->image, src_x, src_y,
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dest_x, dest_y, width, height, False);
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} else {
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XPutImage(context->dpy, d, gc, ximage->image, src_x, src_y, dest_x,
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dest_y, width, height);
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}
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XFlush(context->dpy);
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#endif /* XSHM */
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}
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