IImageDecoder BlendAImage(BellArchive arc, Entry entry, AImageReader overlay)
{
var header = overlay.ReadHeader();
if (header[0] != 1)
{
return(overlay);
}
var scheme = arc.Scheme;
var dir = (List <Entry>)arc.Dir;
int i = dir.IndexOf(entry);
while (--i >= 0 && "image" == dir[i].Type)
{
using (var input = OpenEntry(arc, dir[i]))
{
int type = input.ReadByte();
if (type != 'a')
{
break;
}
int id = input.ReadByte();
if (id != scheme.Value2)
{
break;
}
using (var bin = new BinaryStream(input, dir[i].Name))
using (var base_image = new AImageReader(bin, scheme))
{
var base_header = base_image.ReadHeader();
if (1 == base_header[0])
{
continue;
}
// check if image width/height are the same
if (base_header[3] == header[3] && base_header[4] == header[4])
{
base_image.Unpack();
overlay.Baseline = base_image.Data;
}
break;
}
}
}
return(overlay);
}
/// <summary>
/// Search archive <paramref name="arc"/> for baseline image.
/// </summary>
internal void ReadBaseline(BellArchive arc, Entry entry)
{
var header = ReadHeader();
if (!((header[0] & 1) == 1 && 'd' == this.Type ||
header[0] == 1 && 'a' == this.Type))
{
return;
}
var scheme = arc.Scheme;
var dir = (List <Entry>)arc.Dir;
int i = dir.IndexOf(entry);
while (--i >= 0 && "image" == dir[i].Type)
{
using (var input = arc.OpenEntry(dir[i]))
{
int type = input.ReadByte();
if ('d' == type)
{
continue;
}
if ('a' == type)
{
int id = input.ReadByte();
if (id != scheme.Value2)
{
break;
}
using (var bin = new BinaryStream(input, dir[i].Name))
using (var base_image = new AImageReader(bin, scheme))
{
var base_header = base_image.ReadHeader();
if (1 == base_header[0])
{
continue;
}
// check if image width/height are the same
if (base_header[3] == header[3] && base_header[4] == header[4])
{
base_image.Unpack();
Baseline = base_image.Data;
}
}
}
else if ('b' == type || 'c' == type)
{
var size_buf = new byte[4];
input.Read(size_buf, 0, 4);
var decoder = new PngBitmapDecoder(input, BitmapCreateOptions.None,
BitmapCacheOption.OnLoad);
BitmapSource frame = decoder.Frames[0];
Info.Width = (uint)frame.PixelWidth;
Info.Height = (uint)frame.PixelHeight;
if (frame.Format.BitsPerPixel != 32)
{
frame = new FormatConvertedBitmap(frame, PixelFormats.Bgra32, null, 0);
}
int stride = frame.PixelWidth * 4;
var pixels = new byte[stride * frame.PixelHeight];
frame.CopyPixels(pixels, stride, 0);
Baseline = pixels;
}
break;
}
}
}