/
ltorear.go
67 lines (62 loc) · 1019 Bytes
/
ltorear.go
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// #include <u.h>
// #include <libc.h>
// #include <draw.h>
// #include <memdraw.h>
// #include <memlayer.h>
package memdraw
import "9fans.net/go/draw"
func _memltorear(i *Image, rear *Image) {
l := i.Layer
s := l.Screen
for l.rear != rear {
r := l.rear
x := l.Screenr
overlap := draw.RectClip(&x, r.Layer.Screenr)
if overlap {
memlhide(i, x)
l.clear = false
}
/* swap l and r in screen's list */
rr := r.Layer.rear
f := l.front
if rr == nil {
s.Rearmost = i
} else {
rr.Layer.front = i
}
if f == nil {
s.Frontmost = r
} else {
f.Layer.rear = r
}
l.rear = rr
l.front = r
r.Layer.rear = i
r.Layer.front = f
if overlap {
memlexpose(r, x)
}
}
}
func memltorear(i *Image) {
_memltorear(i, nil)
_memlsetclear(i.Layer.Screen)
}
func LToRearN(ip []*Image, n int) {
if n == 0 {
return
}
var rear *Image
for {
n--
if n < 0 {
break
}
i := ip[0]
ip = ip[1:]
_memltorear(i, rear)
rear = i
}
s := rear.Layer.Screen
_memlsetclear(s)
}