static ngx_buf_t *
ngx_http_image_process(ngx_http_request_t *r)
{
    ngx_int_t                      rc;
    ngx_http_image_filter_ctx_t   *ctx;
    ngx_http_image_filter_conf_t  *conf;

    r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;

    ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);

    rc = ngx_http_image_size(r, ctx);

    conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);

    if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
        return ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);
    }

    ctx->angle = ngx_http_image_filter_get_value(r, conf->acv, conf->angle);

    if (conf->filter == NGX_HTTP_IMAGE_ROTATE) {

        if (ctx->angle != 90 && ctx->angle != 180 && ctx->angle != 270) {
            return NULL;
        }

        return ngx_http_image_resize(r, ctx);
    }

    ctx->max_width = ngx_http_image_filter_get_value(r, conf->wcv, conf->width);
    if (ctx->max_width == 0) {
        return NULL;
    }

    ctx->max_height = ngx_http_image_filter_get_value(r, conf->hcv,
                                                      conf->height);
    if (ctx->max_height == 0) {
        return NULL;
    }

    if (rc == NGX_OK
        && ctx->width <= ctx->max_width
        && ctx->height <= ctx->max_height
        && ctx->angle == 0
        && !ctx->force)
    {
        return ngx_http_image_asis(r, ctx);
    }

    return ngx_http_image_resize(r, ctx);
}
static ngx_buf_t *
ngx_http_image_process(ngx_http_request_t *r)
{
    ngx_buf_t                     *b;
    ngx_int_t                      rc;
    ngx_http_image_filter_ctx_t   *ctx;
    ngx_http_image_filter_conf_t  *conf;

    r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;

    ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);

    rc = ngx_http_image_size(r, ctx);

    conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);

    if (conf->filter == NGX_HTTP_IMAGE_SIZE) {

        b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);

    } else if (rc == NGX_OK
               && ctx->width <= conf->width
               && ctx->height <= conf->height)
    {
        b = ngx_http_image_asis(r, ctx);

    } else {
        b = ngx_http_image_resize(r, ctx);
    }

    return b;
}