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#include "copyright.h"

/* $Header: /var/lib/cvsd/repos/research/researchv9/X11/src/X.V11R1/lib/X/XGetImage.c,v 1.1.1.1 2018/04/24 17:22:00 root Exp $ */
/* Copyright    Massachusetts Institute of Technology    1986	*/

#define NEED_REPLIES
#include "Xlibint.h"
#include <errno.h>

#define ROUNDUP(nbytes, pad) (((((nbytes) - 1) + (pad)) / (pad)) * (pad))

extern XImage *XCreateImage();

static int Ones(mask)                /* HACKMEM 169 */
    unsigned long mask;
{
    register int y;

    y = (mask >> 1) &033333333333;
    y = mask - y - ((y >>1) & 033333333333);
    return (((y + (y >> 3)) & 030707070707) % 077);
}

XImage *XGetImage (dpy, d, x, y, width, height, plane_mask, format)
     register Display *dpy;
     Drawable d;
     int x, y;
     unsigned int width, height;
     long plane_mask;
     int format;	/* either XYPixmap or ZPixmap */
{
	xGetImageReply rep;
	register xGetImageReq *req;
	char *data;
	long nbytes;
	XImage *image;
	LockDisplay(dpy);
	GetReq (GetImage, req);
	/*
	 * first set up the standard stuff in the request
	 */
	req->drawable = d;
	req->x = x;
	req->y = y;
	req->width = width;
	req->height = height;
	req->planeMask = plane_mask;
	req->format = format;
	
	if (_XReply (dpy, (xReply *) &rep, 0, xFalse) == 0) {
		UnlockDisplay(dpy);
		SyncHandle();
		return (XImage *)NULL;
	}
		
	nbytes = (long)rep.length << 2;
	data = (char *) Xmalloc((unsigned) nbytes);
        _XReadPad (dpy, data, nbytes);
        if (format == XYPixmap)
	   image = XCreateImage(dpy, _XVIDtoVisual(dpy, rep.visual),
		  Ones (plane_mask & ((1 << rep.depth) - 1)),
		  format, 0, data, width, height, dpy->bitmap_pad, 0);
	else /* format == ZPixmap */
           image = XCreateImage (dpy, _XVIDtoVisual(dpy, rep.visual),
		 rep.depth, ZPixmap, 0, data, width, height,
		  _XGetScanlinePad(dpy, rep.depth), 0);

	UnlockDisplay(dpy);
	SyncHandle();
	return (image);
}

XGetSubImage(dpy, d, x, y, width, height, plane_mask, format,
               dest_image, dest_x, dest_y)
     register Display *dpy;
     Drawable d;
     int x, y;
     unsigned int width, height;
     unsigned long plane_mask;
     int format;	/* either XYFormat or ZFormat */
     XImage *dest_image;
     int dest_x, dest_y;
{
	XImage *temp_image;
	temp_image = XGetImage(dpy, d, x, y, width, height, 
				plane_mask, format);
	_XSetImage(temp_image, dest_image, dest_x, dest_y);
	_XDestroyImage(temp_image);
}	

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