bool ReadPalette( PngChunkPLTE _palette )
{
int[] rgb = new int[ 4 ];
int c;
for( c=0; c<m_coloursInPalette; c++ )
{
int c2 = c;
if( m_config.m_colorRemapSourceToDest.ContainsKey( c ))
c2 = m_config.m_colorRemapSourceToDest[ c ];
_palette.GetEntryRgb( c2, rgb );
float fr = ((float)rgb[ 0 ]) / 255.0f;
float fg = ((float)rgb[ 1 ]) / 255.0f;
float fb = ((float)rgb[ 2 ]) / 255.0f;
//float fa = ((float)a) / 255.0f;
float fa = 1.0f;
/*
if((c%16) == 0 )
fa = 0.0f;
else
fa = 1.0f;
*/
Color col = new Color( fr, fg, fb, fa );
m_palette.Add( col );
m_colorUsed.Add( false );
}
while( c < 16 )
{
m_palette.Add( new Color( 1.0f, 0.0f, 1.0f, 1.0f ));
m_colorUsed.Add( false );
c++;
}
return true;
}
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;
}