void BlendImage(AgfMetaData info, byte[] overlay, BitmapSource bitmap)
{
if (bitmap.PixelWidth != info.Width || bitmap.PixelHeight != info.Height)
{
return;
}
if (bitmap.Format.BitsPerPixel != 32)
{
bitmap = new FormatConvertedBitmap(bitmap, PixelFormats.Bgra32, null, 0);
}
int stride = bitmap.PixelWidth * 4;
byte[] pixels = new byte[stride * bitmap.PixelHeight];
bitmap.CopyPixels(pixels, stride, 0);
for (int i = 0; i < pixels.Length; i += 4)
{
int pix = overlay[i] | overlay[i + 1] | overlay[i + 2] | overlay[i + 3];
if (0 == pix)
{
overlay[i] = pixels[i];
overlay[i + 1] = pixels[i + 1];
overlay[i + 2] = pixels[i + 2];
overlay[i + 3] = pixels[i + 3];
}
}
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var header = stream.ReadHeader(0x80);
int version = header.ToInt32(4);
if (version != 1 && version != 2)
{
return(null);
}
var info = new AgfMetaData
{
Width = header.ToUInt32(0x1C),
Height = header.ToUInt32(0x20),
BPP = 32,
Version = version,
};
if (1 == version)
{
info.DataOffset = header.ToUInt32(0x0C);
}
else
{
info.DataOffset = header.ToUInt32(0x10);
info.Flags = header.ToUInt32(0x54);
info.BaseNameOffset = header.ToUInt32(0x6C);
}
return(info);
}
string ReadBaseName(IBinaryStream input, AgfMetaData info)
{
input.Position = info.DataOffset + info.BaseNameOffset;
using (var reader = new BinaryReader(input.AsStream, Encoding.Unicode, true))
{
var name = new StringBuilder();
for (;;)
{
char c = reader.ReadChar();
if (0 == c)
{
break;
}
name.Append(c);
}
var dir_name = VFS.GetDirectoryName(info.FileName);
return(VFS.CombinePath(dir_name, name.ToString()));
}
}