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// This include is meant to be the body of the function ResetXX,
// which is implemented exactly the same for different resolutions. For
// compatibility reasons this is controlled by Defines instead of templates.
// Therefor the following type definitions are set to the required values,
// while compiling that function:
//
// #define DATA_TYPE unsigned char
// #define DATA_PAD 1
DATA_TYPE *xdata;
// create buffer for Image-Data
// there is an optimization in the rotation-routine, which sometimes tries
// to access data beyond the allocated image, that might lead to a segmentation
// violation. Therefore, it might be good to allocated some additional
// rows of data for the image.
offset_bytes=xwidth*offset_rows*sizeof(DATA_TYPE);
xdata=new DATA_TYPE[xwidth*(xheight+2*offset_rows)];
{ DATA_TYPE *xdata_run=xdata;
unsigned long blk_pixel=BlackPixel(dpy,scr);
for (int i=xwidth*(xheight+2*offset_rows);i>0;i--) {
*xdata_run++=(DATA_TYPE)blk_pixel;
}
}
xdata+=(offset_bytes/sizeof(DATA_TYPE));
if (!xdata) {
fprintf(stderr,"not enough memory for XImage-data");
exit(-1);
}
// create the XImage
ximage = XCreateImage(dpy, DefaultVisual(dpy,scr),
DefaultDepth(dpy,scr), ZPixmap, 0,
(char*)xdata, xwidth, xheight, 8*DATA_PAD, xwidth*sizeof(DATA_TYPE));
if (!ximage) {
fprintf(stderr,"\n*** can't allocate ximage.\n" );
exit(0);
}
// copy data from original image and inserting pixel values on the fly
if (Width()==xwidth&&Height()==xheight) {
register DATA_TYPE *copy = xdata;
register const byte *org = Data();
register int j,i;
for (i=0; i<Height(); i++) {
for (j=0; j<Width(); j++)
*copy++ = (DATA_TYPE)gif_cols[*org++];
}
}
else {
for (int y=0;y<xheight;y++) {
register const byte *org = Data() + (y*Height()/xheight) * Width();
register DATA_TYPE *copy = xdata + y * xwidth;
if (xwidth<Width()) {
register int x;
register int delta = Width()/2;
for (x=Width();x>0;x--) {
delta-=xwidth;
if (delta<0) {
delta+=Width();
*copy++ = (DATA_TYPE)gif_cols[*org];
}
org++;
}
}
else {
register int x;
register int delta = xwidth/2;
for (x=xwidth;x>0;x--) {
delta-=Width();
*copy++ = (DATA_TYPE)gif_cols[*org];
if (delta<0) {
delta+=xwidth;
org++;
}
}
}
}
}
ximage->data = (char*)xdata;
// XPutImage(dpy,pixmap,p->gc_all,ximage,0,0,0,0,xwidth,xheight);
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