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var blit = (function(){
var blit = {}
blit.and = blit.atop = function(A, B, x, y){
x = x || 0 ; y = y || 0
B.forEach(function(lex, u, v){
var cell = A.getCell(u+x, v+y)
if (cell && lex.opacity > 0) {
cell.assign(lex)
}
})
}
blit.or = blit.under = function(A, B, x, y){
x = x || 0 ; y = y || 0
B.forEach(function(lex, u, v){
var cell = A.getCell(u+x, v+y)
if (cell && cell.opacity == 0) {
cell.assign(lex)
}
})
}
// copy the region of A beginning at x,y into B
blit.copy_from = function(A, B, x, y){
x = x || 0 ; y = y || 0
B.forEach(function(lex, u, v){
var cell = A.getCell(u+x, v+y)
if (cell) {
lex.assign(cell)
}
})
}
blit.copy_to = function(A, B, x, y){
x = x || 0 ; y = y || 0
B.forEach(function(lex, u, v){
var cell = A.getCell(u+x, v+y)
if (cell) {
cell.assign(lex)
}
})
}
blit.invert = function(A, B, x, y){
x = x || 0 ; y = y || 0
B.forEach(function(lex, u, v){
var cell = A.getCell(u+x, v+y)
if (cell && lex.opacity > 0) {
cell.fg = get_inverse(cell.fg)
cell.bg = get_inverse(cell.bg)
}
})
}
blit.circle = function(A, lex){
var hw = brush.w/2|0, hh = brush.h/2|0
A.forEach(function(lex,x,y) {
var len = Math.sqrt(Math.pow(x-hw,2)+Math.pow(y-hh,2))
if (len > Math.abs(hw)) {
lex.clear()
}
})
}
blit.cross = function(A, lex){
A.forEach(function(lex,x,y) {
if ((x+y)%2) {
lex.clear()
}
})
}
return blit
})()
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