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Support negative values in RECTs during Blts.

This commit is contained in:
Lionel Ulmer 2002-08-03 19:11:55 +00:00 committed by Alexandre Julliard
parent 712caf3596
commit 00b088bc25
1 changed files with 54 additions and 14 deletions
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68
dlls/ddraw/dsurface/dib.c
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@ -374,13 +374,6 @@ DIB_DirectDrawSurface_Blt(LPDIRECTDRAWSURFACE7 iface, LPRECT rdst,
}
if (rdst) {
if ((rdst->top < 0) ||
(rdst->left < 0) ||
(rdst->bottom < 0) ||
(rdst->right < 0)) {
ERR(" Negative values in LPRECT !!!\n");
goto release;
}
memcpy(&xdst,rdst,sizeof(xdst));
} else {
xdst.top = 0;
@ -390,13 +383,6 @@ DIB_DirectDrawSurface_Blt(LPDIRECTDRAWSURFACE7 iface, LPRECT rdst,
}
if (rsrc) {
if ((rsrc->top < 0) ||
(rsrc->left < 0) ||
(rsrc->bottom < 0) ||
(rsrc->right < 0)) {
ERR(" Negative values in LPRECT !!!\n");
goto release;
}
memcpy(&xsrc,rsrc,sizeof(xsrc));
} else {
if (src) {
@ -408,9 +394,63 @@ DIB_DirectDrawSurface_Blt(LPDIRECTDRAWSURFACE7 iface, LPRECT rdst,
memset(&xsrc,0,sizeof(xsrc));
}
}
if (src) assert((xsrc.bottom-xsrc.top) <= sdesc.dwHeight);
assert((xdst.bottom-xdst.top) <= ddesc.dwHeight);
/* Now handle negative values in the rectangles. Warning: only supported for now
in the 'simple' cases (ie not in any stretching / rotation cases).
First, the case where nothing is to be done.
*/
if (((xdst.bottom <= 0) || (xdst.right <= 0) || (xdst.top >= (int) ddesc.dwHeight) || (xdst.left >= (int) ddesc.dwWidth)) ||
((src != NULL) &&
((xsrc.bottom <= 0) || (xsrc.right <= 0) || (xsrc.top >= (int) sdesc.dwHeight) || (xsrc.left >= (int) sdesc.dwWidth))))
{
TRACE("Nothing to be done !\n");
goto release;
}
/* The easy case : the source-less blits.... */
if (src == NULL) {
RECT full_rect = { 0, 0, ddesc.dwHeight, ddesc.dwWidth };
RECT temp_rect; /* No idea if intersect rect can be the same as one of the source rect */
IntersectRect(&temp_rect, &full_rect, &xdst);
xdst = temp_rect;
} else {
/* This is trickier as any update to one rectangle need to be propagated to the other */
int clip_horiz = (xdst.left < 0) || (xdst.right > (int) ddesc.dwWidth ) || (xsrc.left < 0) || (xsrc.right > (int) sdesc.dwWidth );
int clip_vert = (xdst.top < 0) || (xdst.bottom > (int) ddesc.dwHeight) || (xsrc.top < 0) || (xsrc.bottom > (int) sdesc.dwHeight);
if (clip_vert || clip_horiz) {
/* Now check if this is a special case or not... */
if ((((xdst.bottom - xdst.top ) != (xsrc.bottom - xsrc.top )) && clip_vert ) ||
(((xdst.right - xdst.left) != (xsrc.right - xsrc.left)) && clip_horiz) ||
(dwFlags & DDBLT_DDFX)) {
WARN("Out of screen rectangle in special case. Not handled right now.\n");
goto release;
}
if (clip_horiz) {
if (xsrc.left < 0) { xdst.left -= xsrc.left; xsrc.left = 0; }
if (xdst.left < 0) { xsrc.left -= xdst.left; xdst.left = 0; }
if (xsrc.right > sdesc.dwWidth) { xdst.right -= (xsrc.right - (int) sdesc.dwWidth); xsrc.right = (int) sdesc.dwWidth; }
if (xdst.right > ddesc.dwWidth) { xsrc.right -= (xdst.right - (int) ddesc.dwWidth); xdst.right = (int) ddesc.dwWidth; }
}
if (clip_vert) {
if (xsrc.top < 0) { xdst.top -= xsrc.top; xsrc.top = 0; }
if (xdst.top < 0) { xsrc.top -= xdst.top; xdst.top = 0; }
if (xsrc.bottom > sdesc.dwHeight) { xdst.bottom -= (xsrc.bottom - (int) sdesc.dwHeight); xsrc.bottom = (int) sdesc.dwHeight; }
if (xdst.bottom > ddesc.dwHeight) { xsrc.bottom -= (xdst.bottom - (int) ddesc.dwHeight); xdst.bottom = (int) ddesc.dwHeight; }
}
/* And check if after clipping something is still to be done... */
if ((xdst.bottom <= 0) || (xdst.right <= 0) || (xdst.top >= (int) ddesc.dwHeight) || (xdst.left >= (int) ddesc.dwWidth) ||
(xsrc.bottom <= 0) || (xsrc.right <= 0) || (xsrc.top >= (int) sdesc.dwHeight) || (xsrc.left >= (int) sdesc.dwWidth)) {
TRACE("Nothing to be done after clipping !\n");
goto release;
}
}
}
bpp = GET_BPP(ddesc);
srcheight = xsrc.bottom - xsrc.top;
srcwidth = xsrc.right - xsrc.left;