113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <memlayer.h>
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#define RECUR(a,b,c,d) _layerop(fn, i, Rect(a.x, b.y, c.x, d.y), clipr, etc, front->layer->rear);
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static void
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_layerop(
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void (*fn)(Memimage*, Rectangle, Rectangle, void*, int),
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Memimage *i,
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Rectangle r,
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Rectangle clipr,
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void *etc,
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Memimage *front)
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{
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Rectangle fr;
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Top:
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if(front == i){
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/* no one is in front of this part of window; use the screen */
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fn(i->layer->screen->image, r, clipr, etc, 0);
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return;
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}
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fr = front->layer->screenr;
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if(rectXrect(r, fr) == 0){
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/* r doesn't touch this window; continue on next rearmost */
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// assert(front && front->layer && front->layer->screen && front->layer->rear);
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front = front->layer->rear;
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goto Top;
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}
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if(fr.max.y < r.max.y){
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RECUR(r.min, fr.max, r.max, r.max);
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r.max.y = fr.max.y;
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}
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if(r.min.y < fr.min.y){
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RECUR(r.min, r.min, r.max, fr.min);
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r.min.y = fr.min.y;
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}
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if(fr.max.x < r.max.x){
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RECUR(fr.max, r.min, r.max, r.max);
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r.max.x = fr.max.x;
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}
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if(r.min.x < fr.min.x){
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RECUR(r.min, r.min, fr.min, r.max);
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r.min.x = fr.min.x;
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}
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/* r is covered by front, so put in save area */
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(*fn)(i->layer->save, r, clipr, etc, 1);
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}
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/*
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* Assumes incoming rectangle has already been clipped to i's logical r and clipr
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*/
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void
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_memlayerop(
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void (*fn)(Memimage*, Rectangle, Rectangle, void*, int),
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Memimage *i,
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Rectangle screenr, /* clipped to window boundaries */
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Rectangle clipr, /* clipped also to clipping rectangles of hierarchy */
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void *etc)
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{
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Memlayer *l;
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Rectangle r, scr;
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l = i->layer;
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if(!rectclip(&screenr, l->screenr))
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return;
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if(l->clear){
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fn(l->screen->image, screenr, clipr, etc, 0);
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return;
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}
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r = screenr;
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scr = l->screen->image->clipr;
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/*
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* Do the piece on the screen
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*/
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if(rectclip(&screenr, scr))
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_layerop(fn, i, screenr, clipr, etc, l->screen->frontmost);
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if(rectinrect(r, scr))
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return;
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/*
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* Do the piece off the screen
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*/
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if(!rectXrect(r, scr)){
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/* completely offscreen; easy */
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fn(l->save, r, clipr, etc, 1);
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return;
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}
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if(r.min.y < scr.min.y){
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/* above screen */
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fn(l->save, Rect(r.min.x, r.min.y, r.max.x, scr.min.y), clipr, etc, 1);
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r.min.y = scr.min.y;
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}
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if(r.max.y > scr.max.y){
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/* below screen */
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fn(l->save, Rect(r.min.x, scr.max.y, r.max.x, r.max.y), clipr, etc, 1);
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r.max.y = scr.max.y;
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}
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if(r.min.x < scr.min.x){
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/* left of screen */
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fn(l->save, Rect(r.min.x, r.min.y, scr.min.x, r.max.y), clipr, etc, 1);
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r.min.x = scr.min.x;
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}
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if(r.max.x > scr.max.x){
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/* right of screen */
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fn(l->save, Rect(scr.max.x, r.min.y, r.max.x, r.max.y), clipr, etc, 1);
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}
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}
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