Function checkColorValidity

dependency/densecrf/examples/lodepng.cpp:2548–2560

return type is a LodePNG error code*/

/*return type is a LodePNG error code*/
static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) /*bd = bitdepth*/
{
    switch(colortype)
    {
        case 0: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; /*grey*/
        case 2: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*RGB*/
        case 3: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8            )) return 37; break; /*palette*/
        case 4: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*grey + alpha*/
        case 6: if(!(                                 bd == 8 || bd == 16)) return 37; break; /*RGBA*/
        default: return 31;
    }
    return 0; /*allowed color type / bits combination*/
}

static unsigned getNumColorChannels(LodePNGColorType colortype)
{