@visactor/vrender-core/es/core/contributions/layerHandler/empty-contribution.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { application } from "../../../application";

export class EmptyLayerHandlerContribution {
    constructor() {
        this.offscreen = !1, this.type = "virtual", this.global = application.global;
    }
    setDpr(dpr) {}
    init(layer, window, params) {
        if (this.layer = layer, this.window = window, params.main) throw new Error("virtual layer不能作为main layer");
        this.main = !1, this.canvas = null, this.context = null;
    }
    resize(w, h) {}
    resizeView(w, h) {}
    render(group, params, userParams) {
        this.mainHandler.render(group, params, Object.assign(Object.assign({}, userParams), {
            clear: !1
        }));
    }
    merge(layerHandlers) {}
    prepare(dirtyBounds, params) {}
    drawTo(target, group, params) {
        var _a;
        const context = target.getContext();
        params.renderService.render(group, Object.assign(Object.assign({
            context: context
        }, params), {
            clear: params.clear ? null !== (_a = params.background) && void 0 !== _a ? _a : "#fff" : void 0
        }));
    }
    getContext() {
        return null;
    }
    release() {}
}
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