public static List <byte[]> DecodeBitmapToDataList(Bitmap image, int parting)
{
if (parting <= 0 || parting > 255)
{
parting = 255;
}
if (image == null)
{
return(null);
}
int width = image.Width;
int height = image.Height;
if (width <= 0 || height <= 0)
{
return(null);
}
if (width > 2040)
{
// 8位9针，宽度限制2040像素（但一般纸张都没法打印那么宽，但并不影响打印）
float scale = 2040 / (float)width;
Matrix matrix = new Matrix();
matrix.PostScale(scale, scale);
Bitmap resizeImage;
try
{
resizeImage = Bitmap.CreateBitmap(image, 0, 0, width, height, matrix, true);
var datas = DecodeBitmapToDataList(resizeImage, parting);
resizeImage.Recycle();
return(datas);
}
catch (OutOfMemoryError)
{
return(null);
}
}
// 宽命令
string widthHexString = Integer.ToHexString(width % 8 == 0 ? width / 8 : (width / 8 + 1));
if (widthHexString.Length > 2)
{
// 超过2040像素才会到达这里
return(null);
}
else if (widthHexString.Length == 1)
{
widthHexString = "0" + widthHexString;
}
widthHexString += "00";
// 每行字节数(除以8，不足补0)
string zeroStr = "";
int zeroCount = width % 8;
if (zeroCount > 0)
{
for (int i = 0; i < (8 - zeroCount); i++)
{
zeroStr += "0";
}
}
List <string> commandList = new List <string>();
// 高度每parting像素进行一次分割
int time = height % parting == 0 ? height / parting : (height / parting + 1);// 循环打印次数
for (int t = 0; t < time; t++)
{
int partHeight = t == time - 1 ? height % parting : parting;// 分段高度
// 高命令
string heightHexString = Integer.ToHexString(partHeight);
if (heightHexString.Length > 2)
{
// 超过255像素才会到达这里
return(null);
}
else if (heightHexString.Length == 1)
{
heightHexString = "0" + heightHexString;
}
heightHexString += "00";
// 宽高指令
string commandHexString = "1D763000";
commandList.Add(commandHexString + widthHexString + heightHexString);
List <string> list = new List <string>(); //binaryString list
Java.Lang.StringBuilder sb = new Java.Lang.StringBuilder();
// 像素二值化，非黑即白
for (int i = 0; i < partHeight; i++)
{
sb.Delete(0, sb.Length());
for (int j = 0; j < width; j++)
{
// 实际在图片中的高度
int startHeight = t * parting + i;
//得到当前像素的值
int color = image.GetPixel(j, startHeight);
int red, green, blue;
if (image.HasAlpha)
{
//得到alpha通道的值
int alpha = Color.GetAlphaComponent(color);
//得到图像的像素RGB的值
red = Color.GetRedComponent(color);
green = Color.GetGreenComponent(color);
blue = Color.GetBlueComponent(color);
float offset = alpha / 255.0f;
// 根据透明度将白色与原色叠加
red = 0xFF + (int)Java.Lang.Math.Ceil((red - 0xFF) * offset);
green = 0xFF + (int)Java.Lang.Math.Ceil((green - 0xFF) * offset);
blue = 0xFF + (int)Java.Lang.Math.Ceil((blue - 0xFF) * offset);
}
else
{
//得到图像的像素RGB的值
red = Color.GetRedComponent(color);
green = Color.GetGreenComponent(color);
blue = Color.GetBlueComponent(color);
}
// 接近白色改为白色。其余黑色
if (red > 160 && green > 160 && blue > 160)
{
sb.Append("0");
}
else
{
sb.Append("1");
}
}
// 每一行结束时，补充剩余的0
if (zeroCount > 0)
{
sb.Append(zeroStr);
}
list.Add(sb.ToString());
}
// binaryStr每8位调用一次转换方法，再拼合
List <string> bmpHexList = new List <string>();
foreach (string binaryStr in list)
{
sb.Delete(0, sb.Length());
for (int i = 0; i < binaryStr.Length; i += 8)
{
string str = binaryStr.Substring(i, i + 8);
// 2进制转成16进制
string hexString = BinaryStrToHexString(str);
sb.Append(hexString);
}
bmpHexList.Add(sb.ToString());
}
// 数据指令
commandList.AddRange(bmpHexList);
}
List <byte[]> data = new List <byte[]>();
foreach (string hexStr in commandList)
{
data.Add(HexStringToBytes(hexStr));
}
return(data);
}