public ImageLevel this [uint index] {
get {
ImageLevelInfo info;
lock (File) {
if (Transcoder.GetImageLevelInfo(File.pTranscoder, File.pData, File.DataSize, Image.Index, index, out info) == 0)
{
throw new Exception("Failed to get image level info");
}
return(new ImageLevel(Image, index, ref info));
}
}
}
public bool TryTranscode(
TranscoderTextureFormats format, ArraySegment <byte> output, DecodeFlags decodeFlags, out ImageLevelInfo levelInfo,
uint outputRowPitch = 0, uint outputHeightInPixels = 0
)
{
lock (File) {
if (!File.IsStarted)
{
if (Transcoder.Start(File.pTranscoder, File.pData, File.DataSize) == 0)
{
levelInfo = default;
return(false);
}
File.IsStarted = true;
}
if (Transcoder.GetImageLevelInfo(File.pTranscoder, File.pData, File.DataSize, Image.Index, Index, out levelInfo) == 0)
{
return(false);
}
var blockSize = Transcoder.GetBytesPerBlockOrPixel(format);
var numBlocks = (uint)(output.Count / blockSize);
fixed(byte *pBuffer = output.Array)
{
var pOutput = pBuffer + output.Offset;
if (Transcoder.TranscodeImageLevel(
File.pTranscoder, File.pData, File.DataSize,
Image.Index, Index, pOutput, numBlocks,
format, decodeFlags, outputRowPitch, outputHeightInPixels
) == 0)
{
return(false);
}
}
}
return(true);
}