public static int[] Palette2rgb(ImageLine line, PngChunkPLTE pal, PngChunkTRNS trns, int[] buf)
{
bool flag = trns != null;
int num = flag ? 4 : 3;
int num2 = line.ImgInfo.Cols * num;
if (buf == null || buf.Length < num2)
{
buf = new int[num2];
}
if (!line.SamplesUnpacked)
{
line = line.unpackToNewImageLine();
}
bool flag2 = line.SampleType == ImageLine.ESampleType.BYTE;
int num3 = (trns != null) ? trns.GetPalletteAlpha().Length : 0;
for (int i = 0; i < line.ImgInfo.Cols; i++)
{
int num4 = flag2 ? (line.ScanlineB[i] & 0xFF) : line.Scanline[i];
pal.GetEntryRgb(num4, buf, i * num);
if (flag)
{
int num5 = buf[i * num + 3] = ((num4 < num3) ? trns.GetPalletteAlpha()[num4] : 255);
}
}
return(buf);
}
/// <summary>
/// Given an indexed line with a palette, unpacks as a RGB array
/// </summary>
/// <param name="line">ImageLine as returned from PngReader</param>
/// <param name="pal">Palette chunk</param>
/// <param name="trns">TRNS chunk (optional)</param>
/// <param name="buf">Preallocated array, optional</param>
/// <returns>R G B (one byte per sample)</returns>
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);
}
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;
}
