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#ifndef _global_h
# include "global.h"
#endif
#ifndef _imgbuff_h
# include "imgbuff.H"
#endif
ImageBuffer::ImageBuffer() {
ximage=0;
width=0;
height=0;
#ifdef USE_MIT_SHM
int major,minor;
Bool pmaps;
shm=(shared)?XShmQueryVersion(dpy,&major,&minor,&pmaps):0;
if (shm&&verbose) {
printf( "--- using shared memory extension V%d.%d %s\n", major, minor,
((pmaps)?"(shared pixmaps supported)":"") );
}
#endif
}
ImageBuffer::~ImageBuffer() {
FreeData();
}
void ImageBuffer::FreeData() {
if (ximage) {
#ifdef USE_MIT_SHM
if (shm) {
XShmDetach(dpy,&shminfo);
XDestroyImage(ximage);
shmdt(shminfo.shmaddr);
shmctl(shminfo.shmid, IPC_RMID, 0 );
}
else
#endif
{
free( ximage->data );
ximage->data = 0L;
XDestroyImage(ximage);
}
ximage=0;
}
}
void ImageBuffer::AllocData(int w, int h, int bpp8) {
FreeData();
width = w;
height = h;
#ifdef USE_MIT_SHM
if (shm) {
ximage = XShmCreateImage(dpy, DefaultVisual(dpy,scr),
DefaultDepth(dpy,scr), ZPixmap, NULL, &shminfo, width, height );
shminfo.shmid = shmget(IPC_PRIVATE, ximage->bytes_per_line * ximage->height, IPC_CREAT|0777);
shminfo.shmaddr = ximage->data = (char*)shmat(shminfo.shmid,0,0);
shminfo.readOnly = False;
XShmAttach(dpy,&shminfo);
}
else
#endif
{
char *data=(char*)malloc(width*height*bpp8);
ximage = XCreateImage(dpy, DefaultVisual(dpy,scr),
DefaultDepth(dpy,scr), ZPixmap, 0,
data, width, height, (8*bpp8), width*bpp8 );
}
}
XImage *ImageBuffer::Init(int w,int h,int bpp8) {
// w+=10; h+=10;
if (w>width||h>height) {
FreeData();
AllocData(w,h,bpp8);
}
return ximage;
}
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