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Viewing file:     gif.js (2.27 KB)      -rw-r--r--

'use strict';

/** @class Gif */

class Gif {

    // width - width of GIF in pixels
    // height - height of GIF in pixels
    // loops - 0 = unending; (n > 0) = iterate n times
    // usesTransparency - whether any frames have transparent pixels
    // colorScope - scope of color tables in GIF
    // frames - array of frames
    // buffer - GIF-formatted data

    /**
     * Gif is a class representing an encoded GIF. It is intended to be a read-only representation of a byte-encoded GIF. Only encoders and decoders should be creating instances of this class.
     * 
     * Property | Description
     * --- | ---
     * width | width of the GIF at its widest
     * height | height of the GIF at its highest
     * loops | the number of times the GIF should loop before stopping; 0 => loop indefinitely
     * usesTransparency | boolean indicating whether at least one frame contains at least one transparent pixel
     * colorScope | the scope of the color tables as encoded within the GIF; either Gif.GlobalColorsOnly (== 1) or Gif.LocalColorsOnly (== 2).
     * frames | a array of GifFrame instances, one for each frame of the GIF
     * buffer | a Buffer holding the encoding's byte data
     * 
     * Its constructor should only ever be called by the GIF encoder or decoder.
     *
     * @param {Buffer} buffer A Buffer containing the encoded bytes
     * @param {GifFrame[]} frames Array of frames found in the encoding
     * @param {object} spec Properties of the encoding as listed above
     */

    constructor(buffer, frames, spec) {
        this.width = spec.width;
        this.height = spec.height;
        this.loops = spec.loops;
        this.usesTransparency = spec.usesTransparency;
        this.colorScope = spec.colorScope;
        this.frames = frames;
        this.buffer = buffer;
    }
}

Gif.GlobalColorsPreferred = 0;
Gif.GlobalColorsOnly = 1;
Gif.LocalColorsOnly = 2;

/** @class GifError */

class GifError extends Error {

    /**
     * GifError is a class representing a GIF-related error
     * 
     * @param {string|Error} messageOrError
     */

    constructor(messageOrError) {
        super(messageOrError);
        if (messageOrError instanceof Error) {
            this.stack = 'Gif' + messageOrError.stack;
        }
    }
}

exports.Gif = Gif;
exports.GifError = GifError;