package draw9

// various bitpacking and decoding functions

import (
	"encoding/binary"
	"image"
)

func atoi(b []byte) int {
	i := 0
	for i < len(b) && b[i] == ' ' {
		i++
	}
	n := 0
	for ; i < len(b) && '0' <= b[i] && b[i] <= '9'; i++ {
		n = n*10 + int(b[i]) - '0'
	}
	return n
}

func atop(b []byte) image.Point {
	return image.Pt(atoi(b), atoi(b[12:]))
}

func ator(b []byte) image.Rectangle {
	return image.Rectangle{atop(b), atop(b[2*12:])}
}

func bplong(b []byte, n uint32) {
	binary.LittleEndian.PutUint32(b, n)
}

func bpshort(b []byte, n uint16) {
	binary.LittleEndian.PutUint16(b, n)
}