static void
optimistic_palette_callback(unsigned num,rgba *pixels) {
unsigned prev_size = paletteSize ;
if( !palettify_row(pixels,num) || paletteSize != prev_size )
FatalUnexpected("Oops! Somehow the precomputed palette does not suffice "
"after all...");
raw_callback(num,pixels);
}
int
palettify_rows (rgba *rows[],unsigned ncols,unsigned nlines)
{
unsigned i ;
for( i=0; i<nlines; i++ ) {
if( !palettify_row(rows[i],ncols) ) {
while( i-- )
unpalettify_row(rows[i],ncols);
return 0 ;
}
}
return 1 ;
}