/* read or write headers */
/* you may set rgbe_header_info to null if you want to */
//int RGBE_WriteHeader(FILE* fp, int width, int height, rgbe_header_info* info);
public static int RGBE_WriteHeader(StreamWriter fp, int width, int height, ref rgbe_header_info info)
{
string programtype = "RGBE";
if ((info.valid & RGBE_VALID_PROGRAMTYPE) != 0)
{
programtype = info.programtype;
}
fp.Write(string.Format("#?{0}{1}", programtype, Environment.NewLine));
/* The #? is to identify file type, the programtype is optional. */
if ((info.valid & RGBE_VALID_GAMMA) != 0)
{
fp.Write(string.Format("GAMMA={0}{1}", info.gamma, Environment.NewLine));
}
if ((info.valid & RGBE_VALID_EXPOSURE) != 0)
{
fp.Write(string.Format("EXPOSURE={0}{1}", info.exposure, Environment.NewLine));
}
fp.Write(string.Format("FORMAT=32-bit_rle_rgbe{0}{0}", Environment.NewLine));
fp.Write(string.Format("-Y {0} +X {1}{2}", height, width, Environment.NewLine));
return(RGBE_RETURN_SUCCESS);
}
/* read or write headers */
/* you may set rgbe_header_info to null if you want to */
//int RGBE_WriteHeader(FILE* fp, int width, int height, rgbe_header_info* info);
public static int RGBE_ReadHeader(StreamReader fp, out int width, out int height, ref rgbe_header_info info)
{
width = 0; height = 0;
info.valid = 0; info.programtype = string.Empty;
info.gamma = 1.0f; info.exposure = 1.0f;
string line = fp.ReadLine();
if (!line.StartsWith("#?"))
{
return(rgbe_error(rgbe_error_codes.rgbe_format_error, "bad initial token"));
}
else
{
info.valid |= RGBE_VALID_PROGRAMTYPE;
info.programtype = line.Substring(2);
}
while (true)
{
line = fp.ReadLine();
if (string.IsNullOrEmpty(line))
{
return(rgbe_error(rgbe_error_codes.rgbe_format_error, "no FORMAT specifier found"));
}
else if (line == "FORMAT=32-bit_rle_rgbe\n")
{
break;
}
else if (line.StartsWith("GAMMA="))
{
string[] parts = line.Split('=');
float gamma = float.Parse(parts[1]);
info.gamma = gamma; info.valid |= RGBE_VALID_GAMMA;
}
else if (line.StartsWith("EXPOSURE="))
{
string[] parts = line.Split('=');
float exposure = float.Parse(parts[1]);
info.exposure = exposure; info.valid |= RGBE_VALID_EXPOSURE;
}
}
line = fp.ReadLine();
if (string.IsNullOrEmpty(line))
{
return(rgbe_error(rgbe_error_codes.rgbe_format_error, "missing blank line after FORMAT specifier"));
}
{
line = fp.ReadLine();
string[] parts = line.Split(' ');
if (parts.Length != 4)
{
return(rgbe_error(rgbe_error_codes.rgbe_format_error, "missing image size specifier"));
}
height = int.Parse(parts[1]);
width = int.Parse(parts[3]);
}
return(RGBE_RETURN_SUCCESS);
}
