/**
 * WebGPURenderer — VideoFrame → WebGPU canvas renderer.
 *
 * Mirrors the public surface of CanvasRenderer so the two are
 * interchangeable behind <movi-player renderer="webgpu"|"webgl">.
 *
 * Scope (initial cut):
 *  - Full presentation queue + A/V-sync presentation loop (parity)
 *  - Fit modes (contain/cover/fill/zoom/control) + smoothed scale
 *  - Letterbox color, rotation (CSS-driven, same as canvas path)
 *  - DOM subtitle overlay — plain text only (karaoke/image cues fall
 *    back to plain text). Full karaoke + image-cue rendering lives in
 *    CanvasRenderer; they can be ported when needed.
 *  - HDR: relies on browser native via canvas color space when
 *    available; no shader-based PQ tone mapping yet.
 *
 * Async note: WebGPU device acquisition is async. configure() kicks
 * off init; until the device is ready, drawFrame() no-ops and frames
 * fall through the queue. The presentation loop still runs so
 * subtitles update.
 */
import type { SubtitleCue } from "../types";
export declare class WebGPURenderer {
    private canvas;
    private device;
    private context;
    private pipeline;
    private sampler;
    private uniformBuffer;
    private bindGroupLayout;
    private canvasFormat;
    private deviceReady;
    private deviceFailed;
    private width;
    private height;
    private colorSpace;
    private hasNativeHDRSupport;
    private frameQueue;
    private static readonly MAX_FRAME_QUEUE;
    private hdrEnabled;
    private isHDRSource;
    private lastPrimaries?;
    private lastTransfer?;
    private rafId;
    private isPlaying;
    private getAudioTime;
    private _isAudioHealthy;
    private presentationStartTime;
    private presentationStartPts;
    private lastPresentedPts;
    private syncedToAudio;
    private lastKnownAudioTime;
    private playbackRate;
    private justSeeked;
    private framesPresented;
    private currentTime;
    private videoFrameRate;
    private rotation;
    private metadataRotation;
    private manualRotation;
    private containerWidth;
    private containerHeight;
    private fitMode;
    private letterboxColor;
    private letterboxTarget;
    private currentScaleX;
    private currentScaleY;
    private lastTargetScaleX;
    private lastTargetScaleY;
    private fitAnimRafId;
    private activeSubtitleCue;
    private subtitleCues;
    private subtitleOverlay;
    private subtitleControlsPadding;
    private subtitleDelay;
    private _lastRenderedSubtitleKey;
    private lastRenderedFrame;
    constructor(canvas: HTMLCanvasElement | OffscreenCanvas, subtitleOverlay?: HTMLElement);
    private initWebGPU;
    configure(width: number, height: number, colorPrimaries?: string, colorTransfer?: string, frameRate?: number, rotation?: number, isHDR?: boolean, _pixelFormat?: string): void;
    private detectColorSpace;
    setHDREnabled(enabled: boolean): void;
    isHDRSupported(): boolean;
    resize(width: number, height: number, fromRotate?: boolean): void;
    setLetterboxColor(r: number, g: number, b: number): void;
    setFitMode(mode: "contain" | "cover" | "fill" | "zoom" | "control"): void;
    private startFitAnimation;
    setAudioTimeProvider(getAudioTime: (() => number) | null, isAudioHealthy?: (() => boolean) | null): void;
    queueFrame(frame: VideoFrame): void;
    render(frame: VideoFrame): void;
    startPresentationLoop(): void;
    stopPresentationLoop(): void;
    private presentationLoop;
    private getCurrentPlaybackTime;
    private selectFrameForPresentation;
    private drawFrame;
    setSubtitleOverlay(overlay: HTMLElement | null): void;
    setSubtitleFormat(format: "vtt" | "srt" | "ass" | "ssa" | "ttml" | "pgs" | "dvd" | "dvb" | string | null): void;
    rotate90(): number;
    getRotation(): number;
    setManualRotation(deg: number): void;
    setSubtitleControlsPadding(padding: number): void;
    setSubtitleCues(cues: SubtitleCue[]): void;
    setSubtitleDelay(seconds: number): void;
    getSubtitleDelay(): number;
    getAllCues(): {
        start: number;
        end: number;
        text: string;
    }[];
    clearSubtitles(): void;
    private updateActiveSubtitle;
    private renderSubtitles;
    private renderImageCue;
    setPlaybackRate(rate: number): void;
    getCurrentTime(): number;
    hasQueuedFrames(): boolean;
    getQueueSize(): number;
    getStats(): {
        framesPresented: number;
        frameQueueSize: number;
        colorSpace: string;
        resolution: string;
        syncedToAudio: boolean;
    };
    dropStaleFrames(targetTimeSec: number, toleranceSec?: number): number;
    clearQueue(): void;
    renderBitmap(_bitmap: ImageBitmap): void;
    clear(): void;
    fillBlack(): void;
    getCanvas(): HTMLCanvasElement | OffscreenCanvas;
    destroy(): void;
}
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