/**
* Creates a new empty TRNS chunk, queues it for write and return it to the caller, who should fill its entries
*/
public PngChunkTRNS CreateTRNSChunk()
{
PngChunkTRNS trns = new PngChunkTRNS(chunkList.imageInfo);
QueueChunk(trns);
return(trns);
}
public PngChunkTRNS CreateTRNSChunk()
{
PngChunkTRNS pngChunkTRNS = new PngChunkTRNS(chunkList.imageInfo);
QueueChunk(pngChunkTRNS);
return(pngChunkTRNS);
}
public override void CloneDataFromRead(PngChunk other)
{
PngChunkTRNS otherx = (PngChunkTRNS)other;
gray = otherx.gray;
red = otherx.red;
green = otherx.green;
blue = otherx.blue;
if (otherx.paletteAlpha != null)
{
paletteAlpha = new int[otherx.paletteAlpha.Length];
System.Array.Copy(otherx.paletteAlpha, 0, paletteAlpha, 0, paletteAlpha.Length);
}
}
public override void CloneDataFromRead(PngChunk other)
{
PngChunkTRNS pngChunkTRNS = (PngChunkTRNS)other;
gray = pngChunkTRNS.gray;
red = pngChunkTRNS.red;
green = pngChunkTRNS.red;
blue = pngChunkTRNS.red;
if (pngChunkTRNS.paletteAlpha != null)
{
paletteAlpha = new int[pngChunkTRNS.paletteAlpha.Length];
Array.Copy(pngChunkTRNS.paletteAlpha, 0, paletteAlpha, 0, paletteAlpha.Length);
}
}
public static int[] Palette2rgb( ImageLine line, PngChunkPLTE pal, PngChunkTRNS trns, int [] buf )
{
bool isalpha = trns != null;
int channels = isalpha ? 4 : 3;
int nsamples = line.ImgInfo.Cols * channels;
if ( buf == null || buf.Length < nsamples )
buf = new int [ nsamples ];
if ( !line.SamplesUnpacked )
line = line.unpackToNewImageLine ();
bool isbyte = line.SampleType == Hjg.Pngcs.ImageLine.ESampleType.BYTE;
int nindexesWithAlpha = trns != null ? trns.GetPalletteAlpha ().Length : 0;
for ( int c = 0; c < line.ImgInfo.Cols; c++ )
{
int index = isbyte ? ( line.ScanlineB [ c ] & 0xFF ) : line.Scanline [ c ];
pal.GetEntryRgb ( index, buf, c * channels );
if ( isalpha )
{
int alpha = index < nindexesWithAlpha ? trns.GetPalletteAlpha () [ index ] : 255;
buf [ c * channels + 3 ] = alpha;
}
}
return buf;
}
/**
* Creates a new empty TRNS chunk, queues it for write and return it to the caller, who should fill its entries
*/
public PngChunkTRNS CreateTRNSChunk()
{
PngChunkTRNS trns = new PngChunkTRNS(chunkList.imageInfo);
QueueChunk(trns);
return trns;
}
