1541    int aindex = 0;  in png_write_image_16bit()  local
1549          aindex = -1;  in png_write_image_16bit()
1554             aindex = (int)channels;  in png_write_image_16bit()
1556          aindex = (int)channels;  in png_write_image_16bit()
1576          const png_uint_16 alpha = in_ptr[aindex];  in png_write_image_16bit()
1580          out_ptr[aindex] = alpha;  in png_write_image_16bit()
1704       int aindex;  in png_write_image_8bit()  local
1709          aindex = -1;  in png_write_image_8bit()
1716       aindex = (int)channels;  in png_write_image_8bit()
1728             png_uint_16 alpha = in_ptr[aindex];  in png_write_image_8bit()
1734             out_ptr[aindex] = alphabyte;  in png_write_image_8bit()