public string decode(Bitmap bmp, LetterFont compareFont)
{
string decodeString = "";
using (UnsafeBitmap ubm = new UnsafeBitmap(bmp))
{
ubm.LockBitmap();
for (int i = 0; i < ubm.Bitmap.Height - compareFont.charHeight + 1; i++)
{
int lastCol = 0;
for (int j = 0; j < ubm.Bitmap.Width; j++)
{
Letter letter = compareFont.findLetter(ubm, j, i, lastCol > 0);
if (letter != null)
{
int padding = (j - lastCol) / compareFont.spaceWidth;
for (int k = 0; k < padding; k++)
{
decodeString += " ";
}
decodeString += letter.convertString;
j += letter.ubm.Bitmap.Width - 1;
lastCol = j + 1;
}
}
if (lastCol > 0)
{
decodeString += "\r\n";
i += compareFont.charHeight - 1;
}
}
}
return(decodeString.Trim());
}
public bool compare(UnsafeBitmap test, int x, int y, bool lineHasChar)
{
string excludeChars = ".-:_";
if (excludeChars.Contains(convertString) &&
(!lineHasChar))
{
return(false);
}
if ((y + ubm.Bitmap.Height) > test.Bitmap.Height)
{
return(false);
}
if ((x + ubm.Bitmap.Width) > test.Bitmap.Width)
{
return(false);
}
for (int j = 0; j < ubm.Bitmap.Width; j++)
{
for (int i = 0; i < ubm.Bitmap.Height; i++)
{
// we are comparing binary bitmaps, so comparing just the green bit is ok
if (test.GetPixel(j + x, i + y).green != ubm.GetPixel(j, i).green)
{
return(false);
}
}
}
return(true);
}
int calcCheckSum(UnsafeBitmap ubmp, int x, int y)
{
int checksum = 0;
for (int i = 0; i < charHeight; i++)
{
checksum = checksum << 1;
if (ubmp.GetPixel(x, y + i).green == 255)
{
checksum += 1;
}
}
return(checksum);
}
public Letter findLetter(UnsafeBitmap ubmp, int x, int y, bool lineHasChar)
{
int checksum = calcCheckSum(ubmp, x, y);
foreach (Letter letter in letters)
{
if (letter.checksum != checksum)
{
continue;
}
if (letter.compare(ubmp, x, y, lineHasChar))
{
return(letter);
}
}
return(null);
}
public Letter(string filename)
{
bmp = new Bitmap(filename);
ubm = new UnsafeBitmap(bmp);
ubm.LockBitmap();
string baseString = Path.GetFileNameWithoutExtension(filename);
if (baseString.Length == 1)
{
convertString = baseString;
}
else if (baseString.EndsWith("_cap"))
{
convertString = baseString[0].ToString().ToUpper();
}
else
{
switch (baseString)
{
case "dash":
convertString = "-";
break;
case "dot":
convertString = ".";
break;
case "bracket_open":
convertString = "<";
break;
case "bracket_close":
convertString = ">";
break;
case "paren_open":
convertString = "(";
break;
case "paren_close":
convertString = ")";
break;
case "plus":
convertString = "+";
break;
case "slash":
convertString = "/";
break;
case "colon":
convertString = ":";
break;
case "underscore":
convertString = "_";
break;
case "square_bracket_open":
convertString = "[";
break;
case "square_bracket_close":
convertString = "]";
break;
case "comma":
convertString = ",";
break;
case "percent":
convertString = "%";
break;
case "pound_sign":
convertString = "#";
break;
case "star":
convertString = "*";
break;
default:
throw new Exception(filename);
}
}
}
public bool compare(UnsafeBitmap test, int x, int y, bool lineHasChar)
{
string excludeChars = ".-:_";
if (excludeChars.Contains(convertString)
&& (!lineHasChar)) return false;
if ((y + ubm.Bitmap.Height) > test.Bitmap.Height) return false;
if ((x + ubm.Bitmap.Width) > test.Bitmap.Width) return false;
for (int j = 0; j < ubm.Bitmap.Width; j++)
{
for (int i = 0; i < ubm.Bitmap.Height; i++)
{
// we are comparing binary bitmaps, so comparing just the green bit is ok
if (test.GetPixel(j + x, i + y).green != ubm.GetPixel(j, i).green)
return false;
}
}
return true;
}
public Letter(string filename)
{
bmp = new Bitmap(filename);
ubm = new UnsafeBitmap(bmp);
ubm.LockBitmap();
string baseString = Path.GetFileNameWithoutExtension(filename);
if (baseString.Length == 1)
{
convertString = baseString;
}
else if (baseString.EndsWith("_cap"))
{
convertString = baseString[0].ToString().ToUpper();
}
else switch (baseString)
{
case "dash":
convertString = "-";
break;
case "dot":
convertString = ".";
break;
case "bracket_open":
convertString = "<";
break;
case "bracket_close":
convertString = ">";
break;
case "paren_open":
convertString = "(";
break;
case "paren_close":
convertString = ")";
break;
case "plus":
convertString = "+";
break;
case "slash":
convertString = "/";
break;
case "colon":
convertString = ":";
break;
case "underscore":
convertString = "_";
break;
case "square_bracket_open":
convertString = "[";
break;
case "square_bracket_close":
convertString = "]";
break;
case "comma":
convertString = ",";
break;
case "percent":
convertString = "%";
break;
case "pound_sign":
convertString = "#";
break;
case "star":
convertString = "*";
break;
default:
throw new Exception(filename);
}
}
public string decode(Bitmap bmp, LetterFont compareFont)
{
string decodeString = "";
using (UnsafeBitmap ubm = new UnsafeBitmap(bmp))
{
ubm.LockBitmap();
for (int i = 0; i < ubm.Bitmap.Height - compareFont.charHeight + 1; i++)
{
int lastCol = 0;
for (int j = 0; j < ubm.Bitmap.Width; j++)
{
Letter letter = compareFont.findLetter(ubm, j, i, lastCol > 0);
if (letter != null)
{
int padding = (j - lastCol) / compareFont.spaceWidth;
for (int k = 0; k < padding; k++)
{
decodeString += " ";
}
decodeString += letter.convertString;
j += letter.ubm.Bitmap.Width - 1;
lastCol = j + 1;
}
}
if (lastCol > 0)
{
decodeString += "\r\n";
i += compareFont.charHeight - 1;
}
}
}
return decodeString.Trim();
}
int calcCheckSum(UnsafeBitmap ubmp, int x, int y)
{
int checksum = 0;
for (int i = 0; i < charHeight; i++)
{
checksum = checksum << 1;
if (ubmp.GetPixel(x, y + i).green == 255) checksum += 1;
}
return checksum;
}
public Letter findLetter(UnsafeBitmap ubmp, int x, int y, bool lineHasChar)
{
int checksum = calcCheckSum(ubmp, x, y);
foreach (Letter letter in letters)
{
if (letter.checksum != checksum) continue;
if (letter.compare(ubmp, x, y, lineHasChar)) return letter;
}
return null;
}
