ImageUtils
4.71 KB
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package com.printer.sdk.usb
import android.graphics.Bitmap
import android.util.Log
import java.util.ArrayList
object ImageUtils {
private const val hexStr = "0123456789ABCDEF"
private val binaryArray = arrayOf("0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111")
fun decodeBitmap(bmp: Bitmap): ByteArray? {
val bmpWidth = bmp.width
val bmpHeight = bmp.height
val list = ArrayList<String>() //binaryString list
var sb: StringBuffer
val zeroCount = bmpWidth % 8
var zeroStr = ""
if (zeroCount > 0) {
for (i in 0 until 8 - zeroCount) {
zeroStr += "0"
}
}
for (i in 0 until bmpHeight) {
sb = StringBuffer()
for (j in 0 until bmpWidth) {
val color = bmp.getPixel(j, i)
val r = color shr 16 and 0xff
val g = color shr 8 and 0xff
val b = color and 0xff
// if color close to white，bit='0', else bit='1'
if (r > 160 && g > 160 && b > 160)
sb.append("0")
else
sb.append("1")
}
if (zeroCount > 0) {
sb.append(zeroStr)
}
list.add(sb.toString())
}
val bmpHexList = binaryListToHexStringList(list)
val commandHexString = "1D763000"
var widthHexString = Integer
.toHexString(if (bmpWidth % 8 == 0)
bmpWidth / 8
else
bmpWidth / 8 + 1)
if (widthHexString.length > 2) {
Log.e("decodeBitmap error", " width is too large")
return null
} else if (widthHexString.length == 1) {
widthHexString = "0$widthHexString"
}
widthHexString += "00"
var heightHexString = Integer.toHexString(bmpHeight)
if (heightHexString.length > 2) {
Log.e("decodeBitmap error", " height is too large")
return null
} else if (heightHexString.length == 1) {
heightHexString = "0$heightHexString"
}
heightHexString += "00"
val commandList = ArrayList<String>()
commandList.add(commandHexString + widthHexString + heightHexString)
commandList.addAll(bmpHexList)
return hexList2Byte(commandList)
}
private fun binaryListToHexStringList(list: List<String>): List<String> {
val hexList = ArrayList<String>()
for (binaryStr in list) {
val sb = StringBuffer()
var i = 0
while (i < binaryStr.length) {
val str = binaryStr.substring(i, i + 8)
val hexString = myBinaryStrToHexString(str)
sb.append(hexString)
i += 8
}
hexList.add(sb.toString())
}
return hexList
}
private fun myBinaryStrToHexString(binaryStr: String): String {
var hex = ""
val f4 = binaryStr.substring(0, 4)
val b4 = binaryStr.substring(4, 8)
for (i in 0 until binaryArray.size) {
if (f4 == binaryArray[i])
hex += hexStr.substring(i, i + 1)
}
for (i in 0 until binaryArray.size) {
if (b4 == binaryArray[i])
hex += hexStr.substring(i, i + 1)
}
return hex
}
private fun hexList2Byte(list: List<String>): ByteArray {
val commandList = ArrayList<ByteArray>()
for (hexStr in list) {
commandList.add(hexStringToBytes(hexStr)!!)
}
return sysCopy(commandList)
}
private fun hexStringToBytes(hexString: String?): ByteArray? {
var hexString = hexString
if (hexString == null || hexString == "") {
return null
}
hexString = hexString.toUpperCase()
val length = hexString.length / 2
val hexChars = hexString.toCharArray()
val d = ByteArray(length)
for (i in 0 until length) {
val pos = i * 2
d[i] = (charToByte(hexChars[pos]).toInt() shl 4 or charToByte(hexChars[pos + 1]).toInt()).toByte()
}
return d
}
fun sysCopy(srcArrays: List<ByteArray>): ByteArray {
var len = 0
for (srcArray in srcArrays) {
len += srcArray.size
}
val destArray = ByteArray(len)
var destLen = 0
for (srcArray in srcArrays) {
System.arraycopy(srcArray, 0, destArray, destLen, srcArray.size)
destLen += srcArray.size
}
return destArray
}
private fun charToByte(c: Char): Byte {
return "0123456789ABCDEF".indexOf(c).toByte()
}
}