Hi again,
I haven't received any answers for my previous email, that's why I've built
my own solution: a function called GrBitBlt1bpp. As the name suggests, it's
very similar to GrBitBlt, except that the source bitmap must have 1 bpp
frame mode, and that it accepts two color parameters, foreground and
background.
I've put this function (provisionally) in bitblt.c
Here is the source code. I haven't tested it exhaustively, only some cases.
If anybody finds bugs, or has comments or suggestions, I would be glad to
know about them.
void GrBitBlt1bpp(GrContext *dst,int dx,int dy,
GrContext *src,int x1,int y1,int x2,int y2,GrColor fg, GrColor
bg)
{
int oldx1,oldy1;
int oldx2,oldy2;
int dstx2,dsty2;
GRX_ENTER();
if(dst == NULL) dst = CURC;
if(src == NULL) src = CURC;
if(src->gc_driver->num_planes != 1 || src->gc_driver->bits_per_pixel
!= 1)
return;
isort(x1,x2); oldx1 = x1;
isort(y1,y2); oldy1 = y1;
cxclip_ordbox(src,x1,y1,x2,y2);
oldx1 = (dx += (x1 - oldx1));
oldy1 = (dy += (y1 - oldy1));
oldx2 = dstx2 = dx + x2 - x1;
oldy2 = dsty2 = dy + y2 - y1;
clip_ordbox(dst,dx,dy,dstx2,dsty2);
x1 += (dx - oldx1);
y1 += (dy - oldy1);
x2 -= (oldx2 - dstx2);
y2 -= (oldy2 - dsty2);
mouse_block(src,x1,y1,x2,y2);
mouse_addblock(dst,dx,dy,dstx2,dsty2);
(dst->gc_driver->drawbitmap)((dx + dst->gc_xoffset),(dy +
dst->gc_yoffset),
(x2 - x1 + 1),(y2 - y1 +
1),src->gc_baseaddr[0],
src->gc_lineoffset,
((dx - oldx1) + ((dy - oldy1) *
(src->gc_lineoffset << 3))),
fg,bg);
mouse_unblock();
GRX_LEAVE();
}
Josu Onandia
