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	bitblt.c - sam - An updated version of the sam text editor.
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	bitblt.c (1958B)
	---
	1 /* Copyright (c) 1998 Lucent Technologies - All rights reserved. */
	2 #include <u.h>
	3 #include <libg.h>
	4 #include "libgint.h"
	5
	6 void
	7 bitblt(Bitmap d, Point p, Bitmap s, Rectangle r, Fcode f)
	8 {
	9 bitblt2(d, p, s, r, f, _fgpixel, _bgpixel);
	10 }
	11
	12 void
	13 bitblt2(Bitmap d, Point p, Bitmap s, Rectangle r, Fcode f, uint64_t fg…
	14 {
	15 int sx, sy, dx, dy, bfunc;
	16 GC g;
	17 uint64_t plane;
	18 Bitmap *btmp;
	19
	20 if (fg == 0)
	21 fg = _fgpixel;
	22
	23 if (bg == 0)
	24 bg = _bgpixel;
	25
	26 if(Dx(r)<=0 \|\| Dy(r)<=0)
	27 return;
	28 sx = r.min.x;
	29 sy = r.min.y;
	30 if(s->flag&SHIFT){
	31 sx -= s->r.min.x;
	32 sy -= s->r.min.y;
	33 }
	34 dx = p.x;
	35 dy = p.y;
	36 if(d->flag&SHIFT){
	37 dx -= d->r.min.x;
	38 dy -= d->r.min.y;
	39 }
	40 g = _getcopygc2(f, d, s, &bfunc, fg, bg);
	41 if(bfunc == UseCopyArea)
	42 XCopyArea(_dpy, (Drawable)s->id, (Drawable)d->id, g,
	43 sx, sy, Dx(r), Dy(r), dx, dy);
	44 else if(bfunc == UseFillRectangle){
	45 XFillRectangle(_dpy, (Drawable)d->id, g,
	46 dx, dy, Dx(r), Dy(r));
	47 }else{
	48 /* bfunc == UseCopyPlane */
	49 plane = _ld2dmask[s->ldepth];
	50 plane &= ~(plane>>1);
	51 if(0/f == S/)
	52 XCopyPlane(_dpy, (Drawable)s->id, (Drawable)d->id, g,
	53 sx, sy, Dx(r), Dy(r), dx, dy, plane);
	54 else {
	55 /*
	56 * CopyPlane can only do func code S,
	57 * so copy src rect into a bitmap with the same depth
	58 * as the dest, then do the bitblt from the tmp.
	59 * This won't recurse again because we only get
	60 * UseCopyPlane with differing bitmap depths
	61 */
	62 btmp = _balloc(Rect(0,0,Dx(r),Dy(r)), d->ldepth);
	63 XCopyPlane(_dpy, (Drawable)s->id, (Drawable)btmp->id, g,
	64 sx, sy, Dx(r), Dy(r), 0, 0, plane);
	65 bitblt(d, p, btmp, btmp->r, f);
	66 bfree(btmp);
	67 }
	68 }
	69 XFlush(_dpy);
	70 }