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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
#include <memlayer.h>
struct Draw
{
Point deltas;
Point deltam;
Memlayer *dstlayer;
Memimage *src;
Memimage *mask;
int op;
};
static
void
ldrawop(Memimage *dst, Rectangle screenr, Rectangle clipr, void *etc, int insave)
{
struct Draw *d;
Point p0, p1;
Rectangle oclipr, srcr, r, mr;
int ok;
d = etc;
if(insave && d->dstlayer->save==nil)
return;
p0 = addpt(screenr.min, d->deltas);
p1 = addpt(screenr.min, d->deltam);
if(insave){
r = rectsubpt(screenr, d->dstlayer->delta);
clipr = rectsubpt(clipr, d->dstlayer->delta);
}else
r = screenr;
/* now in logical coordinates */
/* clipr may have narrowed what we should draw on, so clip if necessary */
if(!rectinrect(r, clipr)){
oclipr = dst->clipr;
dst->clipr = clipr;
ok = drawclipnorepl(dst, &r, d->src, &p0, d->mask, &p1, &srcr, &mr);
dst->clipr = oclipr;
if(!ok)
return;
}
memdraw(dst, r, d->src, p0, d->mask, p1, d->op);
}
void
memdraw(Memimage *dst, Rectangle r, Memimage *src, Point p0, Memimage *mask, Point p1, int op)
{
struct Draw d;
Rectangle srcr, tr, mr;
Memlayer *dl, *sl;
if(mask == nil)
mask = memopaque;
if(mask->layer)
return; /* too hard, at least for now */
Top:
if(dst->layer==nil && src->layer==nil){
memimagedraw(dst, r, src, p0, mask, p1, op);
return;
}
if(drawclipnorepl(dst, &r, src, &p0, mask, &p1, &srcr, &mr) == 0)
return;
/*
* Convert to screen coordinates.
*/
dl = dst->layer;
if(dl != nil){
r.min.x += dl->delta.x;
r.min.y += dl->delta.y;
r.max.x += dl->delta.x;
r.max.y += dl->delta.y;
}
Clearlayer:
if(dl!=nil && dl->clear){
if(src == dst){
p0.x += dl->delta.x;
p0.y += dl->delta.y;
src = dl->screen->image;
}
dst = dl->screen->image;
goto Top;
}
sl = src->layer;
if(sl != nil){
p0.x += sl->delta.x;
p0.y += sl->delta.y;
srcr.min.x += sl->delta.x;
srcr.min.y += sl->delta.y;
srcr.max.x += sl->delta.x;
srcr.max.y += sl->delta.y;
}
/*
* Now everything is in screen coordinates.
* mask is an image. dst and src are images or obscured layers.
*/
/*
* if dst and src are the same layer, just draw in save area and expose.
*/
if(dl!=nil && dst==src){
if(dl->save == nil)
return; /* refresh function makes this case unworkable */
if(rectXrect(r, srcr)){
tr = r;
if(srcr.min.x < tr.min.x){
p1.x += tr.min.x - srcr.min.x;
tr.min.x = srcr.min.x;
}
if(srcr.min.y < tr.min.y){
p1.y += tr.min.x - srcr.min.x;
tr.min.y = srcr.min.y;
}
if(srcr.max.x > tr.max.x)
tr.max.x = srcr.max.x;
if(srcr.max.y > tr.max.y)
tr.max.y = srcr.max.y;
memlhide(dst, tr);
}else{
memlhide(dst, r);
memlhide(dst, srcr);
}
memdraw(dl->save, rectsubpt(r, dl->delta), dl->save,
subpt(srcr.min, src->layer->delta), mask, p1, op);
memlexpose(dst, r);
return;
}
if(sl){
if(sl->clear){
src = sl->screen->image;
if(dl != nil){
r.min.x -= dl->delta.x;
r.min.y -= dl->delta.y;
r.max.x -= dl->delta.x;
r.max.y -= dl->delta.y;
}
goto Top;
}
/* relatively rare case; use save area */
if(sl->save == nil)
return; /* refresh function makes this case unworkable */
memlhide(src, srcr);
/* convert back to logical coordinates */
p0.x -= sl->delta.x;
p0.y -= sl->delta.y;
srcr.min.x -= sl->delta.x;
srcr.min.y -= sl->delta.y;
srcr.max.x -= sl->delta.x;
srcr.max.y -= sl->delta.y;
src = src->layer->save;
}
/*
* src is now an image. dst may be an image or a clear layer
*/
if(dst->layer==nil)
goto Top;
if(dst->layer->clear)
goto Clearlayer;
/*
* dst is an obscured layer
*/
d.deltas = subpt(p0, r.min);
d.deltam = subpt(p1, r.min);
d.dstlayer = dl;
d.src = src;
d.op = op;
d.mask = mask;
_memlayerop(ldrawop, dst, r, r, &d);
}
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