public static GlyphParseResult ParseNextGlyph(FastAccessImage image, GlyphLookup lookup, Rectangle rectangle, int xStart)
{
foreach (var kvp in lookup.ReferenceLookup.OrderBy(key => - 1 * key.Value.Width))
{
if (CheckGlyphMatch(image, lookup, rectangle, xStart, lookup.ReferenceImage, kvp.Value))
{
int xEndOfCurrent = xStart + kvp.Value.Width;
int xStartOfNext = HorizontalSeek(image, lookup, rectangle, xEndOfCurrent);
if (xStartOfNext == -1)
{
return(new GlyphParseResult(false, kvp.Key, -1));
}
else if (xStartOfNext - xEndOfCurrent >= lookup.WhiteSpaceWidth)
{
return(new GlyphParseResult(true, kvp.Key + " ", xStartOfNext));
}
else
{
return(new GlyphParseResult(true, kvp.Key, xStartOfNext));
}
}
}
return(new GlyphParseResult(false, string.Empty, -1));
}
public static string Read(FastAccessImage image, GlyphLookup lookup, Rectangle location)
{
if (location.X > image.Width ||
location.Right > image.Width ||
location.Y > image.Height ||
location.Bottom > image.Height)
{
throw new IndexOutOfRangeException("Rectangle outside of supplied image");
}
int x = HorizontalSeek(image, lookup, location, 0);
if (x == -1)
{
return(string.Empty);
}
StringBuilder parsedString = new StringBuilder();
GlyphParseResult parseResult = new GlyphParseResult(true, string.Empty, x);
do
{
parseResult = ParseNextGlyph(image, lookup, location, x);
x = parseResult.X;
parsedString.Append(parseResult.ParsedString);
}while (parseResult.Continue);
return(parsedString.ToString().Trim());
}
public static List <string> Read(FastAccessImage image, GlyphLookup lookup, List <Rectangle> locations)
{
List <string> results = new List <string>();
foreach (Rectangle location in locations)
{
results.Add(Read(image, lookup, location));
}
return(results);
}
public static int HorizontalSeek(FastAccessImage image, GlyphLookup lookup, Rectangle rectangle, int xStart)
{
if (xStart >= rectangle.Width)
{
return(-1);
}
int left = rectangle.Left;
int top = rectangle.Top;
int width = rectangle.Width;
int height = rectangle.Height;
int y = 0;
for (; xStart < width; xStart++)
{
for (y = 0; y < height; y++)
{
FastAccessImage.Pixel pixel = image.GetPixel(left + xStart, top + y);
if (pixel.Equals(lookup.ReferencePixel))
{
break;
}
}
if (y != height)
{
break;
}
}
if ((xStart == width) && (y == height))
{
return(-1);
}
else
{
return(xStart);
}
}
public static bool CheckGlyphMatch(FastAccessImage image, GlyphLookup lookup, Rectangle location, int xStart, FastAccessImage glyphImageReference, Rectangle glyphRectangle)
{
if (xStart + glyphRectangle.Width > location.Right || glyphRectangle.Height > location.Height)
{
return(false);
}
for (int x = 0; x < glyphRectangle.Width; x++)
{
for (int y = 0; y < glyphRectangle.Height; y++)
{
FastAccessImage.Pixel glyphPixel = glyphImageReference.GetPixel(glyphRectangle.Left + x, glyphRectangle.Top + y);
FastAccessImage.Pixel imagePixel = image.GetPixel(location.Left + xStart + x, location.Top + y);
if ((glyphPixel.Alpha != 0 && !glyphPixel.Equals(imagePixel)) ||
(glyphPixel.Alpha == 0 && imagePixel.Equals(lookup.ReferencePixel)))
{
return(false);
}
}
}
return(true);
}
