@mastra/core/dist/browser/recording/overlay.d.ts

/**
 * Pure functions for caption overlay rendering on screencast frames.
 *
 * Kept separate from browser-recording.ts so the lifecycle/tool code stays
 * focused and the pixel-level logic is easy to test.
 */
/** A caption is a short piece of agent-authored text shown for a window of time. */
export interface RecordingCaption {
    /** Milliseconds since recording start when the caption was added. */
    timestampMs: number;
    /** Plain text caption. */
    text: string;
    /** How long the caption should remain visible (ms). */
    durationMs: number;
}
/** Decoded RGBA frame buffer. */
export interface RgbaFrame {
    width: number;
    height: number;
    /** Tightly packed RGBA pixels (width * height * 4 bytes). */
    data: Uint8ClampedArray;
}
/**
 * Pick the caption that should be visible at a given timestamp.
 *
 * If multiple captions overlap (a new caption starts before the previous
 * expires), the newer one wins.
 *
 * Returns undefined when no caption is active at `t`.
 */
export declare function selectCaptionAt(captions: readonly RecordingCaption[], t: number): RecordingCaption | undefined;
/**
 * Decode a JPEG buffer into an RGBA pixel array.
 * Throws when the JPEG cannot be parsed.
 */
export declare function decodeJpeg(jpegBytes: Uint8Array): RgbaFrame;
/** Options controlling how a caption is drawn over a frame. */
export interface CaptionOverlayOptions {
    /** Integer scaling factor for the bitmap font. Default 2. */
    fontScale?: number;
    /** Vertical padding (in pixels) above and below the text inside the strip. */
    padding?: number;
    /** Bottom margin between the strip and the bottom of the frame. */
    marginBottom?: number;
    /** Background RGB color. Default black. */
    backgroundColor?: [number, number, number];
    /** Background alpha 0..255. Default ~180 (semi-transparent). */
    backgroundAlpha?: number;
    /** Text RGB color. Default white. */
    textColor?: [number, number, number];
}
/**
 * Draw a caption at the bottom of the frame in-place.
 *
 * Renders a semi-transparent dark strip with the text centered on top.
 * Long captions are truncated with an ellipsis to fit the frame width.
 */
export declare function drawCaptionOnFrame(frame: RgbaFrame, caption: string, options?: CaptionOverlayOptions): void;
/**
 * Encode an RGBA frame back into JPEG bytes. Used by the recording pipeline
 * when re-encoding a frame after burning a caption onto it.
 */
export declare function encodeJpeg(frame: RgbaFrame, quality?: number): Uint8Array;
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