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/*
* some X11 ximage / pixmaps rotines
*
* (c) 2006 Gerd Hoffmann <kraxel@redhat.com>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include "x11.h"
/* ------------------------------------------------------------------------ */
XVisualInfo *x11_info;
int have_shmem = 0;
int x11_red_bits = 0;
int x11_red_shift = 0;
int x11_green_bits = 0;
int x11_green_shift = 0;
int x11_blue_bits = 0;
int x11_blue_shift = 0;
static void
x11_find_bits(unsigned long red_mask,
unsigned long green_mask,
unsigned long blue_mask)
{
int i;
unsigned long mask;
for (i = 0; i < 24; i++) {
mask = (1 << i);
if (red_mask & mask)
x11_red_bits++;
else if (!x11_red_bits)
x11_red_shift++;
if (green_mask & mask)
x11_green_bits++;
else if (!x11_green_bits)
x11_green_shift++;
if (blue_mask & mask)
x11_blue_bits++;
else if (!x11_blue_bits)
x11_blue_shift++;
}
#if 0
printf("color: bits shift\n");
printf("red : %04i %05i\n", x11_red_bits, x11_red_shift);
printf("green: %04i %05i\n", x11_green_bits, x11_green_shift);
printf("blue : %04i %05i\n", x11_blue_bits, x11_blue_shift);
#endif
}
int x11_color_init(Display *dpy)
{
Screen *scr;
XVisualInfo template;
int found;
scr = DefaultScreenOfDisplay(dpy);
/* Ask for visual type */
template.screen = XDefaultScreen(dpy);
template.visualid =
XVisualIDFromVisual(DefaultVisualOfScreen(scr));
x11_info = XGetVisualInfo(dpy, VisualIDMask | VisualScreenMask, &template,
&found);
if (XShmQueryExtension(dpy))
have_shmem = 1;
if (x11_info->class != TrueColor) {
fprintf(stderr, "sorry, can't handle visual\n");
return -1;
}
x11_find_bits(x11_info->red_mask, x11_info->green_mask, x11_info->blue_mask);
return 0;
}
/* ------------------------------------------------------------------------ */
static int mitshm_bang = 0;
static int x11_error_dev_null(Display *dpy, XErrorEvent *event)
{
mitshm_bang = 1;
return 0;
}
XImage* x11_create_ximage(Display *dpy, int width, int height, void **shm)
{
XImage *ximage = NULL;
char *ximage_data;
XShmSegmentInfo *shminfo = NULL;
void *old_handler;
Screen *scr = DefaultScreenOfDisplay(dpy);
if (have_shmem) {
old_handler = XSetErrorHandler(x11_error_dev_null);
(*shm) = shminfo = malloc(sizeof(XShmSegmentInfo));
memset(shminfo, 0, sizeof(XShmSegmentInfo));
ximage = XShmCreateImage(dpy,
DefaultVisualOfScreen(scr),
DefaultDepthOfScreen(scr),
ZPixmap, NULL,
shminfo, width, height);
if (ximage) {
shminfo->shmid = shmget(IPC_PRIVATE,
ximage->bytes_per_line * ximage->height,
IPC_CREAT | 0777);
if (-1 == shminfo->shmid) {
fprintf(stderr,"shmget(%dMB): %s\n",
ximage->bytes_per_line * ximage->height / 1024 / 1024,
strerror(errno));
goto oom;
}
shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
if ((void *) -1 == shminfo->shmaddr) {
perror("shmat");
goto oom;
}
ximage->data = shminfo->shmaddr;
shminfo->readOnly = False;
XShmAttach(dpy, shminfo);
XSync(dpy, False);
shmctl(shminfo->shmid, IPC_RMID, 0);
if (mitshm_bang) {
have_shmem = 0;
shmdt(shminfo->shmaddr);
free(shminfo);
shminfo = *shm = NULL;
XDestroyImage(ximage);
ximage = NULL;
}
} else {
have_shmem = 0;
free(shminfo);
shminfo = *shm = NULL;
}
XSetErrorHandler(old_handler);
}
if (ximage == NULL) {
(*shm) = NULL;
if (NULL == (ximage_data = malloc(width * height * 4))) {
fprintf(stderr,"Oops: out of memory\n");
goto oom;
}
ximage = XCreateImage(dpy,
DefaultVisualOfScreen(scr),
DefaultDepthOfScreen(scr),
ZPixmap, 0, ximage_data,
width, height,
8, 0);
}
memset(ximage->data, 0, ximage->bytes_per_line * ximage->height);
return ximage;
oom:
if (shminfo) {
if (shminfo->shmid && shminfo->shmid != -1)
shmctl(shminfo->shmid, IPC_RMID, 0);
free(shminfo);
}
if (ximage)
XDestroyImage(ximage);
return NULL;
}
void x11_destroy_ximage(Display *dpy, XImage *ximage, void *shm)
{
XShmSegmentInfo *shminfo = shm;
if (shminfo) {
XShmDetach(dpy, shminfo);
XDestroyImage(ximage);
shmdt(shminfo->shmaddr);
free(shminfo);
} else
XDestroyImage(ximage);
}
Pixmap x11_create_pixmap(Display *dpy, unsigned char *byte_data,
int width, int height)
{
Pixmap pixmap;
XImage *ximage;
XGCValues values;
GC gc;
unsigned long *long_data = (unsigned long *)byte_data;
int x, y;
void *shm;
Screen *scr = DefaultScreenOfDisplay(dpy);
pixmap = XCreatePixmap(dpy,
RootWindowOfScreen(scr),
width, height,
DefaultDepthOfScreen(scr));
gc = XCreateGC(dpy, pixmap, 0, &values);
if (NULL == (ximage = x11_create_ximage(dpy, width, height, &shm))) {
XFreePixmap(dpy, pixmap);
XFreeGC(dpy, gc);
return 0;
}
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
XPutPixel(ximage, x, y, *(long_data++));
XPUTIMAGE(dpy, pixmap, gc, ximage, 0, 0, 0, 0, width, height);
x11_destroy_ximage(dpy, ximage, shm);
XFreeGC(dpy, gc);
return pixmap;
}
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