395 static MagickBooleanType DecodeImage(Image *image,const ssize_t opacity,  in DecodeImage()  argument
450       SetPixelAlpha(image,index == opacity ? TransparentAlpha : OpaqueAlpha,q);  in DecodeImage()
996     opacity;  in ReadGIFImage()  local
1053   opacity=(-1);  in ReadGIFImage()
1082               opacity=(ssize_t) buffer[3];  in ReadGIFImage()
1275     if (opacity >= (ssize_t) image->colors)  in ReadGIFImage()
1278         opacity=(-1);  in ReadGIFImage()
1281     image->alpha_trait=opacity >= 0 ? BlendPixelTrait : UndefinedPixelTrait;  in ReadGIFImage()
1300           if (i == opacity)  in ReadGIFImage()
1303               image->transparent_color=image->colormap[opacity];  in ReadGIFImage()
1335           if (i == opacity)  in ReadGIFImage()
1367       status=DecodeImage(image,opacity,exception);  in ReadGIFImage()
1392     opacity=(-1);  in ReadGIFImage()
1544     opacity;  in WriteGIFImage()  local
1618     opacity=(-1);  in WriteGIFImage()
1638               if (opacity < 0)  in WriteGIFImage()
1640                   opacity=i;  in WriteGIFImage()
1644               beta=fabs(image->colormap[opacity].alpha-TransparentAlpha);  in WriteGIFImage()
1646                 opacity=i;  in WriteGIFImage()
1648         if (opacity == -1)  in WriteGIFImage()
1654                   if (opacity < 0)  in WriteGIFImage()
1656                       opacity=i;  in WriteGIFImage()
1660                   beta=fabs(image->colormap[opacity].alpha-TransparentAlpha);  in WriteGIFImage()
1662                     opacity=i;  in WriteGIFImage()
1665         if (opacity >= 0)  in WriteGIFImage()
1667             image->colormap[opacity].red=image->transparent_color.red;  in WriteGIFImage()
1668             image->colormap[opacity].green=image->transparent_color.green;  in WriteGIFImage()
1669             image->colormap[opacity].blue=image->transparent_color.blue;  in WriteGIFImage()
1723         if (opacity >= 0)  in WriteGIFImage()
1729         (void) WriteBlobByte(image,(unsigned char) (opacity >= 0 ? opacity :  in WriteGIFImage()