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package vt
import (
"fmt"
)
var _ = fmt.Print
const extra_capacity uint = 4
type LineBuf struct {
cells []Cell
attrs []LineAttrs
line_map, scratch []uint
xnum, ynum uint
}
func NewLineBuf(xnum, ynum uint) *LineBuf {
lm := make([]uint, ynum, ynum+extra_capacity)
var i uint
for i = 0; i < ynum; i++ {
lm[i] = i
}
return &LineBuf{
cells: make([]Cell, xnum*ynum, xnum*(ynum+extra_capacity)),
attrs: make([]LineAttrs, len(lm), cap(lm)),
scratch: make([]uint, len(lm), cap(lm)),
xnum: xnum, ynum: ynum, line_map: lm,
}
}
func (self *LineBuf) Line(y uint) Line {
idx := self.line_map[y]
return Line{Attrs: self.attrs[y], Cells: self.cells[idx*self.xnum : (idx+1)*self.xnum]}
}
func (self *LineBuf) AddLines(n uint) {
ynum := self.ynum + n
if uint(cap(self.line_map)) >= ynum {
self.line_map = self.line_map[0:ynum:cap(self.line_map)]
self.scratch = self.scratch[0:ynum:cap(self.scratch)]
self.attrs = self.attrs[0:ynum:cap(self.attrs)]
self.cells = self.cells[0 : ynum*self.xnum : cap(self.cells)]
} else {
newattrs := make([]LineAttrs, ynum, ynum+extra_capacity)
copy(newattrs, self.attrs)
newlinemap := make([]uint, ynum, ynum+extra_capacity)
copy(newlinemap, self.line_map)
for n = self.ynum; n < ynum; n++ {
newlinemap[n] = n
}
newcells := make([]Cell, self.xnum*ynum, self.xnum*(ynum+extra_capacity))
copy(newcells, self.cells)
self.attrs = newattrs
self.line_map = newlinemap
self.cells = newcells
self.scratch = make([]uint, len(self.line_map), cap(self.line_map))
}
self.ynum = ynum
}
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