/**
 * Apply a 16×16 luma predictor by mode. The `mode` value is the
 * decoder's logical mode (DC_PRED=0, V_PRED=1, H_PRED=2, TM_PRED=3) or
 * one of the variants used at frame edges.
 */
export declare function predictLuma16(mode: number, dst: Uint8Array, off: number): void;
export declare function predictChroma8(mode: number, dst: Uint8Array, off: number): void;
/** Dispatch a 4×4 B-mode predictor by mode index. */
export declare function predictLuma4(mode: number, dst: Uint8Array, off: number): void;
/**
 * VP8 intra prediction.
 *
 * 1:1 port of libwebp's `VP8PredLuma16`, `VP8PredLuma4`, and
 * `VP8PredChroma8` (src/dsp/dec.c). Predictors read neighbour samples
 * directly from the destination buffer at offsets `-1` (left column),
 * `-BPS` (row above), and `-1 - BPS` (top-left corner). The caller is
 * responsible for arranging the buffer with the right surrounding
 * context — see decoder.ts `ReconstructRow` for the layout.
 */
/** Stride between rows in the per-macroblock YUV buffer. */
export declare const BPS: 32;
// Mode constants — aligned with libwebp's enum (16×16 modes alias
// onto the corresponding B-mode values).
export declare const DC_PRED: unknown;
export declare const B_DC_PRED_NOLEFT: 5;
export declare const B_DC_PRED_NOTOPLEFT: 6;
export declare const NUM_B_DC_MODES: 7;
// 4×4 B-modes — libwebp ordering (B_RD=4, B_VR=5, B_LD=6, NOT RFC 6386's LD=4/RD=5/VR=6).
export declare const B_DC: 0;
export declare const B_TM: 1;
export declare const B_VE: 2;
export declare const B_HE: 3;
export declare const B_RD: 4;
export declare const B_VR: 5;
export declare const B_LD: 6;
export declare const B_VL: 7;
export declare const B_HD: 8;
export declare const B_HU: 9;
export declare const NUM_BMODES: 10;
/** Table-driven 16×16 dispatch. */
export declare const VP8PredLuma16: ReadonlyArray<(dst: Uint8Array, off: number) => void>;