public static extern int TranscodeImageLevel(
IntPtr transcoder, void *pData, UInt32 dataSize,
UInt32 imageIndex, UInt32 levelIndex,
void *pOutput, UInt32 outputSizeInBlocks,
TranscoderTextureFormats format, DecodeFlags decodeFlags,
UInt32 outputRowPitch, UInt32 outputHeightInPixels
);
public void GetFormatInfo(TranscoderTextureFormats format, out uint bytesPerBlockOrPixel, out bool isBlockTextureFormat)
{
lock (File) {
bytesPerBlockOrPixel = Transcoder.GetBytesPerBlockOrPixel(format);
isBlockTextureFormat = Transcoder.IsBlockTextureFormat(format);
}
}
public static bool IsBlockTextureFormat(TranscoderTextureFormats format)
{
switch (format)
{
case TranscoderTextureFormats.RGBA32:
case TranscoderTextureFormats.RGB565:
case TranscoderTextureFormats.BGR565:
case TranscoderTextureFormats.RGBA4444:
return(false);
default:
return(true);
}
}
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 uint GetTranscodedSizeInBytes(TranscoderTextureFormats format)
{
uint origWidth, origHeight, totalBlocks;
lock (File) {
var blockSize = Transcoder.GetBytesPerBlockOrPixel(format);
if (Transcoder.GetImageLevelDesc(
File.pTranscoder, File.pData, File.DataSize, Image.Index, Index, out origWidth, out origHeight, out totalBlocks
) == 0)
{
return(0);
}
if (Transcoder.IsBlockTextureFormat(format))
{
return(totalBlocks * blockSize);
}
else
{
return(origWidth * origHeight * blockSize);
}
}
}
public static extern UInt32 GetBytesPerBlockOrPixel(TranscoderTextureFormats format);
