gdImageCopyRotated  864 http/modules/ngx_http_image_filter_module.c             gdImageCopyRotated(dst, src, dy/2, dx/2, 0, 0, dx, dy, ctx->angle);
gdImageCopyRotated  878 http/modules/ngx_http_image_filter_module.c             gdImageCopyRotated(dst, src, dx/2, dy/2, 0, 0, dx, dy, ctx->angle);