private static GifControlDirectory ReadControlBlock(SequentialReader reader)
{
var directory = new GifControlDirectory();
byte packedFields = reader.GetByte();
directory.Set(GifControlDirectory.TagDisposalMethod, (packedFields >> 2) & 7);
directory.Set(GifControlDirectory.TagUserInputFlag, (packedFields & 2) == 2);
directory.Set(GifControlDirectory.TagTransparentColorFlag, (packedFields & 1) == 1);
directory.Set(GifControlDirectory.TagDelay, reader.GetUInt16());
directory.Set(GifControlDirectory.TagTransparentColorIndex, reader.GetByte());
// skip 0x0 block terminator
reader.Skip(1);
return(directory);
}
private static GifControlDirectory ReadControlBlock(SequentialReader reader, byte blockSizeBytes)
{
if (blockSizeBytes < 4)
{
blockSizeBytes = 4;
}
var directory = new GifControlDirectory();
reader.Skip(1);
directory.Set(GifControlDirectory.TagDelay, reader.GetUInt16());
if (blockSizeBytes > 3)
{
reader.Skip(blockSizeBytes - 3);
}
// skip 0x0 block terminator
reader.GetByte();
return(directory);
}