public override ImageMetaData ReadMetaData(Stream stream)
{
int c1 = stream.ReadByte();
int c2 = stream.ReadByte();
if (0x42 != c1 || 0x4d != c2)
{
return(null);
}
using (var file = new ArcView.Reader(stream))
{
uint size = file.ReadUInt32();
if (size < 14 + 40)
{
return(null);
}
SkipBytes(file, 8);
uint header_size = file.ReadUInt32();
if (header_size < 40 || size - 14 < header_size)
{
return(null);
}
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
file.ReadInt16();
int bpp = file.ReadInt16();
return(new ImageMetaData {
Width = width,
Height = height,
OffsetX = 0,
OffsetY = 0,
BPP = bpp
});
}
}
public override ImageMetaData ReadMetaData(Stream stream)
{
using (var file = new ArcView.Reader(stream))
{
short id_length = file.ReadByte();
short colormap_type = file.ReadByte();
if (colormap_type > 1)
{
return(null);
}
short image_type = file.ReadByte();
ushort colormap_first = file.ReadUInt16();
ushort colormap_length = file.ReadUInt16();
short colormap_depth = file.ReadByte();
int pos_x = file.ReadInt16();
int pos_y = file.ReadInt16();
uint width = file.ReadUInt16();
uint height = file.ReadUInt16();
int bpp = file.ReadByte();
if (bpp != 32 && bpp != 24 && bpp != 16 && bpp != 15 && bpp != 8)
{
return(null);
}
short descriptor = file.ReadByte();
uint colormap_offset = (uint)(18 + id_length);
switch (image_type)
{
default: return(null);
case 1: // Uncompressed, color-mapped images.
case 9: // Runlength encoded color-mapped images.
case 32: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding.
case 33: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding. 4-pass quadtree-type process.
if (colormap_depth != 24 && colormap_depth != 32)
{
return(null);
}
break;
case 2: // Uncompressed, RGB images.
case 3: // Uncompressed, black and white images.
case 10: // Runlength encoded RGB images.
case 11: // Compressed, black and white images.
break;
}
return(new TgaMetaData {
OffsetX = pos_x,
OffsetY = pos_y,
Width = width,
Height = height,
BPP = bpp,
ImageType = image_type,
ColormapType = colormap_type,
ColormapOffset = colormap_offset,
ColormapFirst = colormap_first,
ColormapLength = colormap_length,
ColormapDepth = colormap_depth,
Descriptor = descriptor,
});
}
}
public override ImageMetaData ReadMetaData(Stream stream)
{
int c1 = stream.ReadByte();
int c2 = stream.ReadByte();
if (0x42 != c1 || 0x4d != c2)
return null;
using (var file = new ArcView.Reader (stream))
{
uint size = file.ReadUInt32();
if (size < 14+40)
return null;
SkipBytes (file, 8);
uint header_size = file.ReadUInt32();
if (header_size < 40 || size-14 < header_size)
return null;
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
file.ReadInt16();
int bpp = file.ReadInt16();
return new BmpMetaData {
Width = width,
Height = height,
OffsetX = 0,
OffsetY = 0,
BPP = bpp,
ImageLength = size,
HeaderLength = header_size + 14,
};
}
}