static HdrFile ReadHdrFile(string path)
{
if (!File.Exists(path))
{
throw new System.Exception("File does not exist");
}
HdrFile hdr = new HdrFile();
using (FileStream stream = new FileStream(path, FileMode.Open)) {
using (StreamReader sr = new StreamReader(stream)) {
string header = sr.ReadLine().Trim();
Debug.Log(header);
if (header != "#?RADIANCE")
{
throw new System.Exception("File is not in Radiance HDR format.");
}
while (!sr.EndOfStream)
{
string line = sr.ReadLine();
if (line.StartsWith("FORMAT"))
{
switch (line.Substring(7))
{
case "32-bit_rle_rgbe":
hdr.format = HdrFile.Format.RGBE;
break;
case "32-bit_rle_xyze":
hdr.format = HdrFile.Format.XYZE;
throw new System.Exception("XYZE format is not supported.");
default:
throw new System.Exception("HDR file is of an unknown format.");
}
}
// end of header
if (line == string.Empty)
{
break;
}
}
// Read the dimensions
string[] size = sr.ReadLine().Split(' ');
// FIXME assuming that it's -Y +X layout
int width = int.Parse(size[1]);
int height = int.Parse(size[3]);
Color32[] buffer = new Color32[width * height];
hdr.SetDimensions(width, height);
StringBuilder sb = new StringBuilder();
Color lastColor = Color.black;
int cursor = 0;
while (cursor < buffer.Length)
{
byte[] rgbe = new byte[4];
stream.Read(rgbe, 0, 4);
if (width < 8 || width > 32767)
{
hdr.compression = HdrFile.Compression.Uncompressed;
}
else if (cursor == 0 && rgbe [0] == 2 && rgbe [1] == 2)
{
hdr.compression = HdrFile.Compression.AdaptiveRLE;
}
Color32 c = new Color32(rgbe[0], rgbe[1], rgbe[2], rgbe[3]);
if (hdr.compression == HdrFile.Compression.AdaptiveRLE)
{
// TODO
}
else if (c.r == 255 && c.g == 255 && c.b == 255)
{
// Old run-length encoding
hdr.compression = HdrFile.Compression.RLE;
cursor++;
for (int i = 0; i < c.a; i++)
{
buffer [cursor] = lastColor;
cursor++;
}
}
else
{
buffer[cursor] = c;
}
lastColor = c;
cursor++;
}
hdr.SetColors(buffer);
}
}
return(hdr);
}