static private string[] shade_ASCII(byte[][] grey_bytes)
{
string[] result = new string[grey_bytes.Length];
StringBuilder builder = new StringBuilder();
for (int i = 0; i < grey_bytes.Length; i++)
{
builder.Clear();
for (int j = 0; j < grey_bytes[0].Length; j++)
{
GREYSCALE_CONVERSION_VALUES conv_val = (GREYSCALE_CONVERSION_VALUES)grey_bytes[i][j];
if (conv_val <= GREYSCALE_CONVERSION_VALUES.PURE_BLACK)
{
builder.Append("##");
}
else if (conv_val <= GREYSCALE_CONVERSION_VALUES.SEMI_BLACK)
{
builder.Append("==");
}
else if (conv_val <= GREYSCALE_CONVERSION_VALUES.GREY)
{
builder.Append("~~");
}
else
{
builder.Append(" ");
}
}
result[i] = builder.ToString();
}
return(result);
}
static private uint byte_grid_to_pixel_hash(ByteGrid grid)
{
if (grid == null ||
!grid.valid_grid)
{
throw new ArgumentNullException("ASCII_Converter: Null ByteGrid object passed when trying to hash the pixel value.");
}
uint hash = 0;
// 2 bits per byte
for (int i = 0; i < grid.height; i++)
{
for (int j = 0; j < grid.width; j++)
{
hash = hash << 2;
GREYSCALE_CONVERSION_VALUES conv_val =
(GREYSCALE_CONVERSION_VALUES)grid.grid[i][j];
if (conv_val <= GREYSCALE_CONVERSION_VALUES.PURE_BLACK)
{
hash += 3;
}
else if (conv_val <= GREYSCALE_CONVERSION_VALUES.SEMI_BLACK)
{
hash += 2;
}
else if (conv_val <= GREYSCALE_CONVERSION_VALUES.GREY)
{
hash += 1;
}
else if (conv_val <= GREYSCALE_CONVERSION_VALUES.WHITE)
{
hash += 0;
}
else
{
throw new InvalidOperationException("ASCII_Converter: Invalid greyscale byte passed.");
}
}
}
return(hash);
}
