public Gdk.Pixbuf GetPixbuf()
{
ChunkInflater ci = new ChunkInflater ();
Chunk palette = null;
Chunk transparent = null;
foreach (Chunk chunk in Chunks) {
if (chunk.Name == "IDAT")
ci.Add (chunk);
else if (chunk.Name == "PLTE")
palette = chunk;
else if (chunk.Name == "tRNS")
transparent = chunk;
}
IhdrChunk ihdr = (IhdrChunk) Chunks [0];
System.Console.WriteLine ("Attempting to to inflate photo {0}.{1}({2}, {3})", ihdr.Color, ihdr.Depth, ihdr.Width, ihdr.Height);
ScanlineDecoder decoder = new ScanlineDecoder (ci, ihdr.GetScanlineLength (0), ihdr.Height);
decoder.Fill ();
//Gdk.Pixbuf pixbuf = decoder.GetPixbuf ();
//System.Console.WriteLine ("XXXXXXXXXXXXXXXXXXXXXXXXXXX Inflate ############################");
bool alpha = (ihdr.Color == ColorType.GrayAlpha || ihdr.Color == ColorType.RgbA || transparent != null);
Gdk.Pixbuf pixbuf = new Gdk.Pixbuf (Gdk.Colorspace.Rgb,
alpha, 8, (int)ihdr.Width, (int)ihdr.Height);
for (int line = 0; line < ihdr.Height; line++) {
switch (ihdr.Color) {
case ColorType.Rgb:
if (ihdr.Depth == 16) {
decoder.ReconstructRow (line, 6);
decoder.UnpackRGB16Line (pixbuf, line, 3);
} else {
decoder.ReconstructRow (line, 3);
decoder.UnpackRGB8Line (pixbuf, line, 3);
}
break;
case ColorType.RgbA:
if (ihdr.Depth == 16) {
decoder.ReconstructRow (line, 8);
decoder.UnpackRGB16Line (pixbuf, line, 4);
} else {
decoder.ReconstructRow (line, 4);
decoder.UnpackRGB8Line (pixbuf, line, 4);
}
break;
case ColorType.GrayAlpha:
switch (ihdr.Depth) {
case 16:
decoder.ReconstructRow (line, 4);
decoder.UnpackGray16Line (pixbuf, line, true);
break;
default:
decoder.ReconstructRow (line, 2);
decoder.UnpackGrayLine (pixbuf, line, ihdr.Depth, true);
break;
}
break;
case ColorType.Gray:
switch (ihdr.Depth) {
case 16:
decoder.ReconstructRow (line, 2);
decoder.UnpackGray16Line (pixbuf, line, false);
break;
default:
decoder.ReconstructRow (line, 1);
decoder.UnpackGrayLine (pixbuf, line, ihdr.Depth, false);
break;
}
break;
case ColorType.Indexed:
decoder.ReconstructRow (line, 1);
decoder.UnpackRGBIndexedLine (pixbuf,
line,
ihdr.Depth,
palette.Data,
transparent != null ? transparent.Data : null);
break;
default:
throw new System.Exception (System.String.Format ("unhandled color type {0}", ihdr.Color));
}
}
return pixbuf;
}
public ScanlineDecoder(ChunkInflater inflater, uint width, uint height)
{
this.inflater = inflater;
this.row = 0;
this.height = (int)height;
this.width = (int)width;
buffer = new byte [width * height];
Fill ();
}