internal ImageLevel(Image image, uint index, ref ImageLevelInfo info)
{
File = image.File;
Image = image;
Index = index;
Info = 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);
}
public static extern int GetImageLevelInfo(
IntPtr transcoder, void *pData, UInt32 dataSize,
UInt32 imageIndex, UInt32 levelIndex, out ImageLevelInfo result
);