931 png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)  in png_write_sBIT()  argument
948       if (sbit->red == 0 || sbit->red > maxbits ||  in png_write_sBIT()
949           sbit->green == 0 || sbit->green > maxbits ||  in png_write_sBIT()
950           sbit->blue == 0 || sbit->blue > maxbits)  in png_write_sBIT()
955       buf[0] = sbit->red;  in png_write_sBIT()
956       buf[1] = sbit->green;  in png_write_sBIT()
957       buf[2] = sbit->blue;  in png_write_sBIT()
962       if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)  in png_write_sBIT()
967       buf[0] = sbit->gray;  in png_write_sBIT()
973       if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)  in png_write_sBIT()
978       buf[size++] = sbit->alpha;  in png_write_sBIT()