} // 'MICO'
public override ImageMetaData ReadMetaData(IBinaryStream file)
{
var header = file.ReadHeader(0x10);
if (!header.AsciiEqual(4, "CG01"))
{
return(null);
}
int length = header.ToInt32(8);
using (var input = new Mg2EncryptedStream(file.AsStream, 0x10, length))
using (var png = new BinaryStream(input, file.Name))
{
var info = Png.ReadMetaData(png);
if (null == info)
{
return(null);
}
return(new Mg2MetaData
{
Width = info.Width,
Height = info.Height,
OffsetX = info.OffsetX,
OffsetY = info.OffsetY,
BPP = info.BPP,
ImageLength = length,
AlphaLength = header.ToInt32(12)
});
}
}
public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
var meta = (Mg2MetaData)info;
BitmapSource frame;
using (var input = new Mg2EncryptedStream(file.AsStream, 0x10, meta.ImageLength))
{
var decoder = new PngBitmapDecoder(input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
frame = decoder.Frames[0];
if (0 == meta.AlphaLength)
{
frame.Freeze();
return(new ImageData(frame, info));
}
}
if (frame.Format.BitsPerPixel != 32)
{
frame = new FormatConvertedBitmap(frame, PixelFormats.Bgr32, null, 0);
}
int stride = frame.PixelWidth * 4;
var pixels = new byte[stride * (int)meta.Height];
frame.CopyPixels(pixels, stride, 0);
using (var input = new Mg2EncryptedStream(file.AsStream, 0x10 + meta.ImageLength, meta.AlphaLength))
{
var decoder = new PngBitmapDecoder(input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource alpha_frame = decoder.Frames[0];
if (alpha_frame.PixelWidth != frame.PixelWidth || alpha_frame.PixelHeight != frame.PixelHeight)
{
return(ImageData.Create(info, PixelFormats.Bgr32, null, pixels, stride));
}
alpha_frame = new FormatConvertedBitmap(alpha_frame, PixelFormats.Gray8, null, 0);
var alpha = new byte[alpha_frame.PixelWidth * alpha_frame.PixelHeight];
alpha_frame.CopyPixels(alpha, alpha_frame.PixelWidth, 0);
int src = 0;
for (int dst = 3; dst < pixels.Length; dst += 4)
{
pixels[dst] = alpha[src++];
}
return(ImageData.Create(info, PixelFormats.Bgra32, null, pixels, stride));
}
}
public Mg2EncryptedStream CreateStream(Stream main, int offset, int length)
{
return(Mg2EncryptedStream.CreateV2(main, offset, length));
}
