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- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- #include <memdraw.h>
- #include <memlayer.h>
- struct Lline
- {
- Point p0;
- Point p1;
- Point delta;
- int end0;
- int end1;
- int radius;
- Point sp;
- Memlayer *dstlayer;
- Memimage *src;
- int op;
- };
- static void llineop(Memimage*, Rectangle, Rectangle, void*, int);
- static
- void
- _memline(Memimage *dst, Point p0, Point p1, int end0, int end1, int radius, Memimage *src, Point sp, Rectangle clipr, int op)
- {
- Rectangle r;
- struct Lline ll;
- Point d;
- int srcclipped;
- Memlayer *dl;
- if(radius < 0)
- return;
- if(src->layer) /* can't draw line with layered source */
- return;
- srcclipped = 0;
- Top:
- dl = dst->layer;
- if(dl == nil){
- _memimageline(dst, p0, p1, end0, end1, radius, src, sp, clipr, op);
- return;
- }
- if(!srcclipped){
- d = subpt(sp, p0);
- if(rectclip(&clipr, rectsubpt(src->clipr, d)) == 0)
- return;
- if((src->flags&Frepl)==0 && rectclip(&clipr, rectsubpt(src->r, d))==0)
- return;
- srcclipped = 1;
- }
- /* dst is known to be a layer */
- p0.x += dl->delta.x;
- p0.y += dl->delta.y;
- p1.x += dl->delta.x;
- p1.y += dl->delta.y;
- clipr.min.x += dl->delta.x;
- clipr.min.y += dl->delta.y;
- clipr.max.x += dl->delta.x;
- clipr.max.y += dl->delta.y;
- if(dl->clear){
- dst = dst->layer->screen->image;
- goto Top;
- }
- /* XXX */
- /* this is not the correct set of tests */
- // if(log2[dst->depth] != log2[src->depth] || log2[dst->depth]!=3)
- // return;
- /* can't use sutherland-cohen clipping because lines are wide */
- r = memlinebbox(p0, p1, end0, end1, radius);
- /*
- * r is now a bounding box for the line;
- * use it as a clipping rectangle for subdivision
- */
- if(rectclip(&r, clipr) == 0)
- return;
- ll.p0 = p0;
- ll.p1 = p1;
- ll.end0 = end0;
- ll.end1 = end1;
- ll.sp = sp;
- ll.dstlayer = dst->layer;
- ll.src = src;
- ll.radius = radius;
- ll.delta = dl->delta;
- ll.op = op;
- _memlayerop(llineop, dst, r, r, &ll);
- }
- static
- void
- llineop(Memimage *dst, Rectangle screenr, Rectangle clipr, void *etc, int insave)
- {
- struct Lline *ll;
- Point p0, p1;
- USED(screenr.min.x);
- ll = etc;
- if(insave && ll->dstlayer->save==nil)
- return;
- if(!rectclip(&clipr, screenr))
- return;
- if(insave){
- p0 = subpt(ll->p0, ll->delta);
- p1 = subpt(ll->p1, ll->delta);
- clipr = rectsubpt(clipr, ll->delta);
- }else{
- p0 = ll->p0;
- p1 = ll->p1;
- }
- _memline(dst, p0, p1, ll->end0, ll->end1, ll->radius, ll->src, ll->sp, clipr, ll->op);
- }
- void
- memline(Memimage *dst, Point p0, Point p1, int end0, int end1, int radius, Memimage *src, Point sp, int op)
- {
- _memline(dst, p0, p1, end0, end1, radius, src, sp, dst->clipr, op);
- }
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