forked from olcxjas-softworks/LarpixClient
105 lines
No EOL
3 KiB
JavaScript
105 lines
No EOL
3 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.decompressFrames = exports.decompressFrame = exports.parseGIF = void 0;
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var _gif = _interopRequireDefault(require("js-binary-schema-parser/lib/schemas/gif"));
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var _jsBinarySchemaParser = require("js-binary-schema-parser");
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var _uint = require("js-binary-schema-parser/lib/parsers/uint8");
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var _deinterlace = require("./deinterlace");
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var _lzw = require("./lzw");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
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var parseGIF = function parseGIF(arrayBuffer) {
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var byteData = new Uint8Array(arrayBuffer);
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return (0, _jsBinarySchemaParser.parse)((0, _uint.buildStream)(byteData), _gif["default"]);
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};
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exports.parseGIF = parseGIF;
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var generatePatch = function generatePatch(image) {
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var totalPixels = image.pixels.length;
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var patchData = new Uint8ClampedArray(totalPixels * 4);
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for (var i = 0; i < totalPixels; i++) {
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var pos = i * 4;
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var colorIndex = image.pixels[i];
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var color = image.colorTable[colorIndex] || [0, 0, 0];
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patchData[pos] = color[0];
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patchData[pos + 1] = color[1];
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patchData[pos + 2] = color[2];
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patchData[pos + 3] = colorIndex !== image.transparentIndex ? 255 : 0;
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}
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return patchData;
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};
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var decompressFrame = function decompressFrame(frame, gct, buildImagePatch) {
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if (!frame.image) {
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console.warn('gif frame does not have associated image.');
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return;
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}
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var image = frame.image; // get the number of pixels
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var totalPixels = image.descriptor.width * image.descriptor.height; // do lzw decompression
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var pixels = (0, _lzw.lzw)(image.data.minCodeSize, image.data.blocks, totalPixels); // deal with interlacing if necessary
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if (image.descriptor.lct.interlaced) {
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pixels = (0, _deinterlace.deinterlace)(pixels, image.descriptor.width);
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}
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var resultImage = {
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pixels: pixels,
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dims: {
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top: frame.image.descriptor.top,
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left: frame.image.descriptor.left,
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width: frame.image.descriptor.width,
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height: frame.image.descriptor.height
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}
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}; // color table
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if (image.descriptor.lct && image.descriptor.lct.exists) {
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resultImage.colorTable = image.lct;
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} else {
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resultImage.colorTable = gct;
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} // add per frame relevant gce information
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if (frame.gce) {
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resultImage.delay = (frame.gce.delay || 10) * 10; // convert to ms
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resultImage.disposalType = frame.gce.extras.disposal; // transparency
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if (frame.gce.extras.transparentColorGiven) {
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resultImage.transparentIndex = frame.gce.transparentColorIndex;
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}
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} // create canvas usable imagedata if desired
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if (buildImagePatch) {
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resultImage.patch = generatePatch(resultImage);
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}
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return resultImage;
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};
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exports.decompressFrame = decompressFrame;
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var decompressFrames = function decompressFrames(parsedGif, buildImagePatches) {
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return parsedGif.frames.filter(function (f) {
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return f.image;
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}).map(function (f) {
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return decompressFrame(f, parsedGif.gct, buildImagePatches);
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});
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};
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exports.decompressFrames = decompressFrames; |