static void
GrSubtractRegionWrapper(void *r)
{
nxSubtractRegionReq *req = r;
GrSubtractRegion(req->regionid, req->srcregionid1, req->srcregionid2);
}
int
XSubtractRegion(Region regM, Region regS, Region regD)
{
GrSubtractRegion(regD->rid, regM->rid, regS->rid);
#if CLIENTREGIONS
GR_RECT extents;
GrGetRegionBox(regD->rid, &extents);
rectToBox(&extents, ®D->extents);
#endif
return 1;
}
/*
Calculate Visible region of root window.
*/
int
CalcRootVisible(void)
{
GR_REGION_ID covered;
GR_REGION_ID visible;
GR_WINDOW_ID parent;
GR_WINDOW_ID *children;
GR_COUNT nChildren;
GR_COUNT wx;
GR_RECT rect;
GR_WINDOW_INFO info;
/*
Get children of root.
*/
GrQueryTree(GR_ROOT_WINDOW_ID, &parent, &children, &nChildren);
/*
For each mapped child, add the window rectangle to the covered
region.
*/
covered = GrNewRegion();
for (wx=0; wx<nChildren; wx++) {
GrGetWindowInfo(children[wx], &info);
if (info.unmapcount == 0) {
rect.x = info.x;
rect.y = info.y;
rect.width = info.width;
rect.height = info.height;
GrUnionRectWithRegion(covered, &rect);
}
}
free(children);
/*
Subtract the covered region from the root window region.
*/
visible = GrNewRegion();
rect.x = 0;
rect.y = 0;
rect.width = display_width;
rect.height = display_height;
GrUnionRectWithRegion(visible, &rect);
GrSubtractRegion(visible, visible, covered);
GrDestroyRegion(covered);
/*
Save visible region globally.
*/
if (rootVisible)
GrDestroyRegion(rootVisible);
rootVisible = visible;
/*
Mark all roaches visible.
*/
for (wx=0; wx<curRoaches; wx++)
roaches[wx].hidden = 0;
return 0;
}