mirror of
https://github.com/swc-project/swc.git
synced 2024-12-30 00:52:29 +03:00
1043 lines
34 KiB
TypeScript
1043 lines
34 KiB
TypeScript
// Loaded from https://deno.land/x/jpegts@1.1/lib/decoder.ts
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/* tslint:disable */
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import { Image } from "./image.ts"
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const JpegImage = (function jpegImage() {
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"use strict";
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const dctZigZag = new Int32Array([
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0,
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1, 8,
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16, 9, 2,
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3, 10, 17, 24,
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32, 25, 18, 11, 4,
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5, 12, 19, 26, 33, 40,
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48, 41, 34, 27, 20, 13, 6,
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7, 14, 21, 28, 35, 42, 49, 56,
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57, 50, 43, 36, 29, 22, 15,
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23, 30, 37, 44, 51, 58,
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59, 52, 45, 38, 31,
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39, 46, 53, 60,
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61, 54, 47,
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55, 62,
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63
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]);
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const dctCos1 = 4017 // cos(pi/16)
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const dctSin1 = 799 // sin(pi/16)
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const dctCos3 = 3406 // cos(3*pi/16)
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const dctSin3 = 2276 // sin(3*pi/16)
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const dctCos6 = 1567 // cos(6*pi/16)
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const dctSin6 = 3784 // sin(6*pi/16)
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const dctSqrt2 = 5793 // sqrt(2)
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const dctSqrt1d2 = 2896 // sqrt(2) / 2
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function constructor() {
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}
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// @ts-ignore
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function buildHuffmanTable(codeLengths, values) {
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let k = 0
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const code = []
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let i, j, length = 16;
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while (length > 0 && !codeLengths[length - 1]) {
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length--;
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}
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code.push({children: [], index: 0});
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let p = code[0], q;
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for (i = 0; i < length; i++) {
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for (j = 0; j < codeLengths[i]; j++) {
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// @ts-ignore
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p = code.pop();
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// @ts-ignore
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p.children[p.index] = values[k];
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while (p.index > 0) {
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// @ts-ignore
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p = code.pop();
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}
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p.index++;
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code.push(p);
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while (code.length <= i) {
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code.push(q = {children: [], index: 0});
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// @ts-ignore
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p.children[p.index] = q.children;
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p = q;
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}
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k++;
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}
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if (i + 1 < length) {
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// p here points to last code
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code.push(q = {children: [], index: 0});
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// @ts-ignore
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p.children[p.index] = q.children;
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p = q;
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}
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}
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return code[0].children;
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}
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// @ts-ignore
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function decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successivePrev, successive) {
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const mcusPerLine = frame.mcusPerLine;
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const progressive = frame.progressive;
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const startOffset = offset
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let bitsData = 0, bitsCount = 0;
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function readBit() {
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if (bitsCount > 0) {
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bitsCount--;
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return (bitsData >> bitsCount) & 1;
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}
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bitsData = data[offset++];
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if (bitsData === 0xFF) {
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const nextByte = data[offset++];
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if (nextByte) {
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throw new Error("unexpected marker: " + ((bitsData << 8) | nextByte).toString(16));
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}
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// unstuff 0
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}
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bitsCount = 7;
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return bitsData >>> 7;
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}
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// @ts-ignore
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function decodeHuffman(tree) {
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let node = tree, bit;
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while ((bit = readBit()) !== null) {
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node = node[bit];
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if (typeof node === "number") {
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return node;
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}
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if (typeof node !== "object") {
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throw new Error("invalid huffman sequence");
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}
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}
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return null;
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}
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// @ts-ignore
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function receive(length) {
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let n = 0;
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while (length > 0) {
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const bit = readBit();
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if (bit === null) { return; }
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n = (n << 1) | bit;
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length--;
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}
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return n;
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}
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// @ts-ignore
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function receiveAndExtend(length) {
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const n = receive(length);
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// @ts-ignore
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if (n >= 1 << (length - 1)) {
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return n;
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}
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// @ts-ignore
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return n + (-1 << length) + 1;
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}
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// @ts-ignore
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function decodeBaseline(component, zz) {
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const t = decodeHuffman(component.huffmanTableDC);
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const diff = t === 0 ? 0 : receiveAndExtend(t);
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zz[0] = (component.pred += diff);
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let k = 1;
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while (k < 64) {
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const rs = decodeHuffman(component.huffmanTableAC);
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// @ts-ignore
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const s = rs & 15, r = rs >> 4;
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if (s === 0) {
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if (r < 15) {
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break;
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}
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k += 16;
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continue;
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}
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k += r;
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const z = dctZigZag[k];
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zz[z] = receiveAndExtend(s);
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k++;
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}
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}
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// @ts-ignore
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function decodeDCFirst(component, zz) {
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const t = decodeHuffman(component.huffmanTableDC);
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// @ts-ignore
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const diff = t === 0 ? 0 : (receiveAndExtend(t) << successive);
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zz[0] = (component.pred += diff);
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}
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// @ts-ignore
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function decodeDCSuccessive(component, zz) {
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zz[0] |= readBit() << successive;
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}
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let eobrun = 0;
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// @ts-ignore
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function decodeACFirst(component, zz) {
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if (eobrun > 0) {
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eobrun--;
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return;
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}
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let k = spectralStart, e = spectralEnd;
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while (k <= e) {
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const rs = decodeHuffman(component.huffmanTableAC);
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// @ts-ignore
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const s = rs & 15, r = rs >> 4;
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if (s === 0) {
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if (r < 15) {
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// @ts-ignore
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eobrun = receive(r) + (1 << r) - 1;
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break;
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}
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k += 16;
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continue;
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}
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k += r;
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const z = dctZigZag[k];
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// @ts-ignore
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zz[z] = receiveAndExtend(s) * (1 << successive);
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k++;
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}
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}
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// @ts-ignore
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let successiveACState = 0, successiveACNextValue;
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// @ts-ignore
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function decodeACSuccessive(component, zz) {
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let k = spectralStart, e = spectralEnd, r = 0;
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while (k <= e) {
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const z = dctZigZag[k];
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const direction = zz[z] < 0 ? -1 : 1;
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switch (successiveACState) {
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case 0: // initial state
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const rs = decodeHuffman(component.huffmanTableAC);
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// @ts-ignore
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const s = rs & 15;
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// @ts-ignore
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r = rs >> 4
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if (s === 0) {
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if (r < 15) {
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// @ts-ignore
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eobrun = receive(r) + (1 << r);
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successiveACState = 4;
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} else {
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r = 16;
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successiveACState = 1;
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}
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} else {
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if (s !== 1) {
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throw new Error("invalid ACn encoding");
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}
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successiveACNextValue = receiveAndExtend(s);
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successiveACState = r ? 2 : 3;
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}
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continue;
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case 1: // skipping r zero items
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case 2:
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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} else {
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r--;
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if (r === 0) {
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successiveACState = successiveACState == 2 ? 3 : 0;
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}
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}
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break;
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case 3: // set value for a zero item
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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} else {
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// @ts-ignore
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zz[z] = successiveACNextValue << successive;
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successiveACState = 0;
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}
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break;
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case 4: // eob
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if (zz[z]) {
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zz[z] += (readBit() << successive) * direction;
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}
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break;
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}
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k++;
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}
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if (successiveACState === 4) {
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eobrun--;
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if (eobrun === 0) {
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successiveACState = 0;
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}
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}
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}
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// @ts-ignore
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function decodeMcu(component, decode, mcu, row, col) {
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const mcuRow = (mcu / mcusPerLine) | 0;
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const mcuCol = mcu % mcusPerLine;
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const blockRow = mcuRow * component.v + row;
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const blockCol = mcuCol * component.h + col;
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decode(component, component.blocks[blockRow][blockCol]);
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}
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// @ts-ignore
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function decodeBlock(component, decode, mcu) {
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const blockRow = (mcu / component.blocksPerLine) | 0;
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const blockCol = mcu % component.blocksPerLine;
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decode(component, component.blocks[blockRow][blockCol]);
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}
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const componentsLength = components.length;
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let component, i, j, k, n;
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let decodeFn;
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if (progressive) {
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if (spectralStart === 0) {
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decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
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} else {
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decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
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}
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} else {
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decodeFn = decodeBaseline;
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}
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let mcu = 0, marker;
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let mcuExpected;
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if (componentsLength == 1) {
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mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
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} else {
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mcuExpected = mcusPerLine * frame.mcusPerColumn;
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}
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if (!resetInterval) { resetInterval = mcuExpected; }
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let h, v;
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while (mcu < mcuExpected) {
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// reset interval stuff
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for (i = 0; i < componentsLength; i++) {
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components[i].pred = 0;
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}
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eobrun = 0;
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if (componentsLength == 1) {
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component = components[0];
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for (n = 0; n < resetInterval; n++) {
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decodeBlock(component, decodeFn, mcu);
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mcu++;
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}
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} else {
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for (n = 0; n < resetInterval; n++) {
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for (i = 0; i < componentsLength; i++) {
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component = components[i];
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h = component.h;
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v = component.v;
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for (j = 0; j < v; j++) {
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for (k = 0; k < h; k++) {
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decodeMcu(component, decodeFn, mcu, j, k);
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}
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}
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}
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mcu++;
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// If we've reached our expected MCU's, stop decoding
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if (mcu === mcuExpected) { break; }
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}
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}
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// find marker
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bitsCount = 0;
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marker = (data[offset] << 8) | data[offset + 1];
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if (marker < 0xFF00) {
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throw new Error("marker was not found");
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}
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if (marker >= 0xFFD0 && marker <= 0xFFD7) { // RSTx
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offset += 2;
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} else {
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break;
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}
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}
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return offset - startOffset;
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}
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// @ts-ignore
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function buildComponentData(frame, component) {
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const lines = [];
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const blocksPerLine = component.blocksPerLine;
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const blocksPerColumn = component.blocksPerColumn;
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const samplesPerLine = blocksPerLine << 3;
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const R = new Int32Array(64), r = new Uint8Array(64);
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// @ts-ignore
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function quantizeAndInverse(zz, dataOut, dataIn) {
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const qt = component.quantizationTable;
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let v0, v1, v2, v3, v4, v5, v6, v7, t;
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const p = dataIn;
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let i;
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// dequant
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for (i = 0; i < 64; i++) {
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p[i] = zz[i] * qt[i];
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}
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// inverse DCT on rows
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for (i = 0; i < 8; ++i) {
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const row = 8 * i;
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// check for all-zero AC coefficients
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if (p[1 + row] == 0 && p[2 + row] == 0 && p[3 + row] == 0 &&
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p[4 + row] == 0 && p[5 + row] == 0 && p[6 + row] == 0 &&
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p[7 + row] == 0) {
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t = (dctSqrt2 * p[0 + row] + 512) >> 10;
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p[0 + row] = t;
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p[1 + row] = t;
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p[2 + row] = t;
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p[3 + row] = t;
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p[4 + row] = t;
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p[5 + row] = t;
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p[6 + row] = t;
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p[7 + row] = t;
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continue;
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}
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// stage 4
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v0 = (dctSqrt2 * p[0 + row] + 128) >> 8;
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v1 = (dctSqrt2 * p[4 + row] + 128) >> 8;
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v2 = p[2 + row];
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v3 = p[6 + row];
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v4 = (dctSqrt1d2 * (p[1 + row] - p[7 + row]) + 128) >> 8;
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v7 = (dctSqrt1d2 * (p[1 + row] + p[7 + row]) + 128) >> 8;
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v5 = p[3 + row] << 4;
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v6 = p[5 + row] << 4;
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// stage 3
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t = (v0 - v1 + 1) >> 1;
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v0 = (v0 + v1 + 1) >> 1;
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v1 = t;
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t = (v2 * dctSin6 + v3 * dctCos6 + 128) >> 8;
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v2 = (v2 * dctCos6 - v3 * dctSin6 + 128) >> 8;
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v3 = t;
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t = (v4 - v6 + 1) >> 1;
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v4 = (v4 + v6 + 1) >> 1;
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v6 = t;
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t = (v7 + v5 + 1) >> 1;
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v5 = (v7 - v5 + 1) >> 1;
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v7 = t;
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// stage 2
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t = (v0 - v3 + 1) >> 1;
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v0 = (v0 + v3 + 1) >> 1;
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v3 = t;
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t = (v1 - v2 + 1) >> 1;
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v1 = (v1 + v2 + 1) >> 1;
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v2 = t;
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t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
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v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
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v7 = t;
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t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
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v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
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v6 = t;
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// stage 1
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p[0 + row] = v0 + v7;
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p[7 + row] = v0 - v7;
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p[1 + row] = v1 + v6;
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p[6 + row] = v1 - v6;
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p[2 + row] = v2 + v5;
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p[5 + row] = v2 - v5;
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p[3 + row] = v3 + v4;
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p[4 + row] = v3 - v4;
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}
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// inverse DCT on columns
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for (i = 0; i < 8; ++i) {
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const col = i;
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// check for all-zero AC coefficients
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if (p[1 * 8 + col] == 0 && p[2 * 8 + col] == 0 && p[3 * 8 + col] == 0 &&
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p[4 * 8 + col] == 0 && p[5 * 8 + col] == 0 && p[6 * 8 + col] == 0 &&
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p[7 * 8 + col] == 0) {
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t = (dctSqrt2 * dataIn[i + 0] + 8192) >> 14;
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p[0 * 8 + col] = t;
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p[1 * 8 + col] = t;
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p[2 * 8 + col] = t;
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p[3 * 8 + col] = t;
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p[4 * 8 + col] = t;
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p[5 * 8 + col] = t;
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p[6 * 8 + col] = t;
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p[7 * 8 + col] = t;
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continue;
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}
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// stage 4
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v0 = (dctSqrt2 * p[0 * 8 + col] + 2048) >> 12;
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v1 = (dctSqrt2 * p[4 * 8 + col] + 2048) >> 12;
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v2 = p[2 * 8 + col];
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v3 = p[6 * 8 + col];
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v4 = (dctSqrt1d2 * (p[1 * 8 + col] - p[7 * 8 + col]) + 2048) >> 12;
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v7 = (dctSqrt1d2 * (p[1 * 8 + col] + p[7 * 8 + col]) + 2048) >> 12;
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v5 = p[3 * 8 + col];
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v6 = p[5 * 8 + col];
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// stage 3
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t = (v0 - v1 + 1) >> 1;
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v0 = (v0 + v1 + 1) >> 1;
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v1 = t;
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t = (v2 * dctSin6 + v3 * dctCos6 + 2048) >> 12;
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v2 = (v2 * dctCos6 - v3 * dctSin6 + 2048) >> 12;
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v3 = t;
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t = (v4 - v6 + 1) >> 1;
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v4 = (v4 + v6 + 1) >> 1;
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v6 = t;
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t = (v7 + v5 + 1) >> 1;
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v5 = (v7 - v5 + 1) >> 1;
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v7 = t;
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// stage 2
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t = (v0 - v3 + 1) >> 1;
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v0 = (v0 + v3 + 1) >> 1;
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v3 = t;
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t = (v1 - v2 + 1) >> 1;
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v1 = (v1 + v2 + 1) >> 1;
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v2 = t;
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t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
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v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
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v7 = t;
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t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
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v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
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v6 = t;
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|
|
|
// stage 1
|
|
p[0 * 8 + col] = v0 + v7;
|
|
p[7 * 8 + col] = v0 - v7;
|
|
p[1 * 8 + col] = v1 + v6;
|
|
p[6 * 8 + col] = v1 - v6;
|
|
p[2 * 8 + col] = v2 + v5;
|
|
p[5 * 8 + col] = v2 - v5;
|
|
p[3 * 8 + col] = v3 + v4;
|
|
p[4 * 8 + col] = v3 - v4;
|
|
}
|
|
|
|
// convert to 8-bit integers
|
|
for (i = 0; i < 64; ++i) {
|
|
const sample = 128 + ((p[i] + 8) >> 4);
|
|
dataOut[i] = sample < 0 ? 0 : sample > 0xFF ? 0xFF : sample;
|
|
}
|
|
}
|
|
|
|
let i, j;
|
|
for (let blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
|
|
const scanLine = blockRow << 3;
|
|
for (i = 0; i < 8; i++) {
|
|
lines.push(new Uint8Array(samplesPerLine));
|
|
}
|
|
for (let blockCol = 0; blockCol < blocksPerLine; blockCol++) {
|
|
quantizeAndInverse(component.blocks[blockRow][blockCol], r, R);
|
|
|
|
let offset = 0, sample = blockCol << 3;
|
|
for (j = 0; j < 8; j++) {
|
|
const line = lines[scanLine + j];
|
|
for (i = 0; i < 8; i++) {
|
|
line[sample + i] = r[offset++];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return lines;
|
|
}
|
|
|
|
// @ts-ignore
|
|
function clampTo8bit(a) {
|
|
return a < 0 ? 0 : a > 255 ? 255 : a;
|
|
}
|
|
|
|
constructor.prototype = {
|
|
// @ts-ignore
|
|
load: function load(path) {
|
|
// let xhr = new XMLHttpRequest();
|
|
// xhr.open("GET", path, true);
|
|
// xhr.responseType = "arraybuffer";
|
|
// xhr.onload = (function() {
|
|
// // TODO catch parse error
|
|
// let data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer);
|
|
// this.parse(data);
|
|
// if (this.onload)
|
|
// this.onload();
|
|
// }).bind(this);
|
|
// xhr.send(null);
|
|
},
|
|
parse: function parse(data: Uint8Array) {
|
|
let offset = 0;
|
|
function readUint16() {
|
|
const value = (data[offset] << 8) | data[offset + 1];
|
|
offset += 2;
|
|
return value;
|
|
}
|
|
function readDataBlock() {
|
|
const length = readUint16();
|
|
const array = data.subarray(offset, offset + length - 2);
|
|
offset += array.length;
|
|
return array;
|
|
}
|
|
// @ts-ignore
|
|
function prepareComponents(frame) {
|
|
let maxH = 0, maxV = 0;
|
|
let component, componentId;
|
|
for (componentId in frame.components) {
|
|
if (frame.components.hasOwnProperty(componentId)) {
|
|
component = frame.components[componentId];
|
|
if (maxH < component.h) { maxH = component.h; }
|
|
if (maxV < component.v) { maxV = component.v; }
|
|
}
|
|
}
|
|
const mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / maxH);
|
|
const mcusPerColumn = Math.ceil(frame.scanLines / 8 / maxV);
|
|
for (componentId in frame.components) {
|
|
if (frame.components.hasOwnProperty(componentId)) {
|
|
component = frame.components[componentId];
|
|
const blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / maxH);
|
|
const blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines / 8) * component.v / maxV);
|
|
const blocksPerLineForMcu = mcusPerLine * component.h;
|
|
const blocksPerColumnForMcu = mcusPerColumn * component.v;
|
|
const blocks = [];
|
|
for (let i = 0; i < blocksPerColumnForMcu; i++) {
|
|
const row = [];
|
|
for (let j = 0; j < blocksPerLineForMcu; j++) {
|
|
row.push(new Int32Array(64));
|
|
}
|
|
blocks.push(row);
|
|
}
|
|
component.blocksPerLine = blocksPerLine;
|
|
component.blocksPerColumn = blocksPerColumn;
|
|
component.blocks = blocks;
|
|
}
|
|
}
|
|
frame.maxH = maxH;
|
|
frame.maxV = maxV;
|
|
frame.mcusPerLine = mcusPerLine;
|
|
frame.mcusPerColumn = mcusPerColumn;
|
|
}
|
|
let jfif = null;
|
|
let adobe = null;
|
|
let frame, resetInterval;
|
|
const quantizationTables = [], frames = [];
|
|
// @ts-ignore
|
|
const huffmanTablesAC = [], huffmanTablesDC = [];
|
|
let fileMarker = readUint16();
|
|
if (fileMarker != 0xFFD8) { // SOI (Start of Image)
|
|
throw new Error("SOI not found");
|
|
}
|
|
|
|
fileMarker = readUint16();
|
|
while (fileMarker != 0xFFD9) { // EOI (End of image)
|
|
let i, j, l;
|
|
switch (fileMarker) {
|
|
case 0xFF00: break;
|
|
case 0xFFE0: // APP0 (Application Specific)
|
|
case 0xFFE1: // APP1
|
|
case 0xFFE2: // APP2
|
|
case 0xFFE3: // APP3
|
|
case 0xFFE4: // APP4
|
|
case 0xFFE5: // APP5
|
|
case 0xFFE6: // APP6
|
|
case 0xFFE7: // APP7
|
|
case 0xFFE8: // APP8
|
|
case 0xFFE9: // APP9
|
|
case 0xFFEA: // APP10
|
|
case 0xFFEB: // APP11
|
|
case 0xFFEC: // APP12
|
|
case 0xFFED: // APP13
|
|
case 0xFFEE: // APP14
|
|
case 0xFFEF: // APP15
|
|
case 0xFFFE: // COM (Comment)
|
|
const appData = readDataBlock();
|
|
|
|
if (fileMarker === 0xFFE0) {
|
|
if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 &&
|
|
appData[3] === 0x46 && appData[4] === 0) { // 'JFIF\x00'
|
|
jfif = {
|
|
version: { major: appData[5], minor: appData[6] },
|
|
densityUnits: appData[7],
|
|
xDensity: (appData[8] << 8) | appData[9],
|
|
yDensity: (appData[10] << 8) | appData[11],
|
|
thumbWidth: appData[12],
|
|
thumbHeight: appData[13],
|
|
thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
|
|
};
|
|
}
|
|
}
|
|
// TODO APP1 - Exif
|
|
if (fileMarker === 0xFFEE) {
|
|
if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F &&
|
|
appData[3] === 0x62 && appData[4] === 0x65 && appData[5] === 0) { // 'Adobe\x00'
|
|
adobe = {
|
|
version: appData[6],
|
|
flags0: (appData[7] << 8) | appData[8],
|
|
flags1: (appData[9] << 8) | appData[10],
|
|
transformCode: appData[11]
|
|
};
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 0xFFDB: // DQT (Define Quantization Tables)
|
|
const quantizationTablesLength = readUint16();
|
|
const quantizationTablesEnd = quantizationTablesLength + offset - 2;
|
|
while (offset < quantizationTablesEnd) {
|
|
const quantizationTableSpec = data[offset++];
|
|
const tableData = new Int32Array(64);
|
|
if ((quantizationTableSpec >> 4) === 0) { // 8 bit values
|
|
for (j = 0; j < 64; j++) {
|
|
const z = dctZigZag[j];
|
|
tableData[z] = data[offset++];
|
|
}
|
|
} else if ((quantizationTableSpec >> 4) === 1) { // 16 bit
|
|
for (j = 0; j < 64; j++) {
|
|
const z = dctZigZag[j];
|
|
tableData[z] = readUint16();
|
|
}
|
|
} else {
|
|
throw new Error("DQT: invalid table spec");
|
|
}
|
|
quantizationTables[quantizationTableSpec & 15] = tableData;
|
|
}
|
|
break;
|
|
|
|
case 0xFFC0: // SOF0 (Start of Frame, Baseline DCT)
|
|
case 0xFFC1: // SOF1 (Start of Frame, Extended DCT)
|
|
case 0xFFC2: // SOF2 (Start of Frame, Progressive DCT)
|
|
readUint16(); // skip data length
|
|
frame = {};
|
|
// @ts-ignore
|
|
frame.extended = (fileMarker === 0xFFC1);
|
|
// @ts-ignore
|
|
frame.progressive = (fileMarker === 0xFFC2);
|
|
// @ts-ignore
|
|
frame.precision = data[offset++];
|
|
// @ts-ignore
|
|
frame.scanLines = readUint16();
|
|
// @ts-ignore
|
|
frame.samplesPerLine = readUint16();
|
|
// @ts-ignore
|
|
frame.components = {};
|
|
// @ts-ignore
|
|
frame.componentsOrder = [];
|
|
let componentsCount = data[offset++], componentId;
|
|
for (i = 0; i < componentsCount; i++) {
|
|
componentId = data[offset];
|
|
const h = data[offset + 1] >> 4;
|
|
const v = data[offset + 1] & 15;
|
|
const qId = data[offset + 2];
|
|
// @ts-ignore
|
|
frame.componentsOrder.push(componentId);
|
|
// @ts-ignore
|
|
frame.components[componentId] = {
|
|
h: h,
|
|
v: v,
|
|
quantizationIdx: qId
|
|
};
|
|
offset += 3;
|
|
}
|
|
prepareComponents(frame);
|
|
frames.push(frame);
|
|
break;
|
|
|
|
case 0xFFC4: // DHT (Define Huffman Tables)
|
|
const huffmanLength = readUint16();
|
|
for (i = 2; i < huffmanLength;) {
|
|
const huffmanTableSpec = data[offset++];
|
|
const codeLengths = new Uint8Array(16);
|
|
let codeLengthSum = 0;
|
|
for (j = 0; j < 16; j++, offset++) {
|
|
codeLengthSum += (codeLengths[j] = data[offset]);
|
|
}
|
|
const huffmanValues = new Uint8Array(codeLengthSum);
|
|
for (j = 0; j < codeLengthSum; j++, offset++) {
|
|
huffmanValues[j] = data[offset];
|
|
}
|
|
i += 17 + codeLengthSum;
|
|
|
|
((huffmanTableSpec >> 4) === 0 ?
|
|
// @ts-ignore
|
|
huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] =
|
|
buildHuffmanTable(codeLengths, huffmanValues);
|
|
}
|
|
break;
|
|
|
|
case 0xFFDD: // DRI (Define Restart Interval)
|
|
readUint16(); // skip data length
|
|
resetInterval = readUint16();
|
|
break;
|
|
|
|
case 0xFFDA: // SOS (Start of Scan)
|
|
readUint16();
|
|
const selectorsCount = data[offset++];
|
|
let components = [], component;
|
|
for (i = 0; i < selectorsCount; i++) {
|
|
// @ts-ignore
|
|
component = frame.components[data[offset++]];
|
|
const tableSpec = data[offset++];
|
|
// @ts-ignore
|
|
component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
|
|
// @ts-ignore
|
|
component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
|
|
components.push(component);
|
|
}
|
|
const spectralStart = data[offset++];
|
|
const spectralEnd = data[offset++];
|
|
const successiveApproximation = data[offset++];
|
|
const processed = decodeScan(data, offset,
|
|
frame, components, resetInterval,
|
|
spectralStart, spectralEnd,
|
|
successiveApproximation >> 4, successiveApproximation & 15);
|
|
offset += processed;
|
|
break;
|
|
|
|
case 0xFFFF: // Fill bytes
|
|
if (data[offset] !== 0xFF) { // Avoid skipping a valid marker.
|
|
offset--;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
if (data[offset - 3] == 0xFF &&
|
|
data[offset - 2] >= 0xC0 && data[offset - 2] <= 0xFE) {
|
|
// could be incorrect encoding -- last 0xFF byte of the previous
|
|
// block was eaten by the encoder
|
|
offset -= 3;
|
|
break;
|
|
}
|
|
throw new Error("unknown JPEG marker " + fileMarker.toString(16));
|
|
}
|
|
fileMarker = readUint16();
|
|
}
|
|
if (frames.length != 1) {
|
|
throw new Error("only single frame JPEGs supported");
|
|
}
|
|
|
|
// set each frame's components quantization table
|
|
for (let i = 0; i < frames.length; i++) {
|
|
// @ts-ignore
|
|
const cp = frames[i].components;
|
|
for (const j in cp) {
|
|
cp[j].quantizationTable = quantizationTables[cp[j].quantizationIdx];
|
|
delete cp[j].quantizationIdx;
|
|
}
|
|
}
|
|
// @ts-ignore
|
|
this.width = frame.samplesPerLine;
|
|
// @ts-ignore
|
|
this.height = frame.scanLines;
|
|
this.jfif = jfif;
|
|
this.adobe = adobe;
|
|
this.components = [];
|
|
// @ts-ignore
|
|
for (let i = 0; i < frame.componentsOrder.length; i++) {
|
|
// @ts-ignore
|
|
const component = frame.components[frame.componentsOrder[i]];
|
|
this.components.push({
|
|
lines: buildComponentData(frame, component),
|
|
// @ts-ignore
|
|
scaleX: component.h / frame.maxH,
|
|
// @ts-ignore
|
|
scaleY: component.v / frame.maxV
|
|
});
|
|
}
|
|
},
|
|
// @ts-ignore
|
|
getData: function getData(width, height) {
|
|
const scaleX = this.width / width, scaleY = this.height / height;
|
|
|
|
let component1, component2, component3, component4;
|
|
let component1Line, component2Line, component3Line, component4Line;
|
|
let x, y;
|
|
let offset = 0;
|
|
let Y, Cb, Cr, K, C, M, Ye, R, G, B;
|
|
let colorTransform;
|
|
const dataLength = width * height * this.components.length;
|
|
const data = new Uint8Array(dataLength);
|
|
switch (this.components.length) {
|
|
case 1:
|
|
component1 = this.components[0];
|
|
for (y = 0; y < height; y++) {
|
|
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
|
|
for (x = 0; x < width; x++) {
|
|
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
|
|
data[offset++] = Y;
|
|
}
|
|
}
|
|
break;
|
|
case 2:
|
|
// PDF might compress two component data in custom colorspace
|
|
component1 = this.components[0];
|
|
component2 = this.components[1];
|
|
for (y = 0; y < height; y++) {
|
|
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
|
|
component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
|
|
for (x = 0; x < width; x++) {
|
|
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
data[offset++] = Y;
|
|
Y = component2Line[0 | (x * component2.scaleX * scaleX)];
|
|
data[offset++] = Y;
|
|
}
|
|
}
|
|
break;
|
|
case 3:
|
|
// The default transform for three components is true
|
|
colorTransform = true;
|
|
// The adobe transform marker overrides any previous setting
|
|
if (this.adobe && this.adobe.transformCode) {
|
|
colorTransform = true;
|
|
} else if (typeof this.colorTransform !== "undefined") {
|
|
colorTransform = !!this.colorTransform;
|
|
}
|
|
|
|
component1 = this.components[0];
|
|
component2 = this.components[1];
|
|
component3 = this.components[2];
|
|
for (y = 0; y < height; y++) {
|
|
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
|
|
component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
|
|
component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
|
|
for (x = 0; x < width; x++) {
|
|
if (!colorTransform) {
|
|
R = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
G = component2Line[0 | (x * component2.scaleX * scaleX)];
|
|
B = component3Line[0 | (x * component3.scaleX * scaleX)];
|
|
} else {
|
|
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
|
|
Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
|
|
|
|
R = clampTo8bit(Y + 1.402 * (Cr - 128));
|
|
G = clampTo8bit(Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128));
|
|
B = clampTo8bit(Y + 1.772 * (Cb - 128));
|
|
}
|
|
|
|
data[offset++] = R;
|
|
data[offset++] = G;
|
|
data[offset++] = B;
|
|
}
|
|
}
|
|
break;
|
|
case 4:
|
|
if (!this.adobe) {
|
|
throw new Error("Unsupported color mode (4 components)");
|
|
}
|
|
// The default transform for four components is false
|
|
colorTransform = false;
|
|
// The adobe transform marker overrides any previous setting
|
|
if (this.adobe && this.adobe.transformCode) {
|
|
colorTransform = true;
|
|
} else if (typeof this.colorTransform !== "undefined") {
|
|
colorTransform = !!this.colorTransform;
|
|
}
|
|
|
|
component1 = this.components[0];
|
|
component2 = this.components[1];
|
|
component3 = this.components[2];
|
|
component4 = this.components[3];
|
|
for (y = 0; y < height; y++) {
|
|
component1Line = component1.lines[0 | (y * component1.scaleY * scaleY)];
|
|
component2Line = component2.lines[0 | (y * component2.scaleY * scaleY)];
|
|
component3Line = component3.lines[0 | (y * component3.scaleY * scaleY)];
|
|
component4Line = component4.lines[0 | (y * component4.scaleY * scaleY)];
|
|
for (x = 0; x < width; x++) {
|
|
if (!colorTransform) {
|
|
C = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
M = component2Line[0 | (x * component2.scaleX * scaleX)];
|
|
Ye = component3Line[0 | (x * component3.scaleX * scaleX)];
|
|
K = component4Line[0 | (x * component4.scaleX * scaleX)];
|
|
} else {
|
|
Y = component1Line[0 | (x * component1.scaleX * scaleX)];
|
|
Cb = component2Line[0 | (x * component2.scaleX * scaleX)];
|
|
Cr = component3Line[0 | (x * component3.scaleX * scaleX)];
|
|
K = component4Line[0 | (x * component4.scaleX * scaleX)];
|
|
|
|
C = 255 - clampTo8bit(Y + 1.402 * (Cr - 128));
|
|
M = 255 - clampTo8bit(Y - 0.3441363 * (Cb - 128) - 0.71413636 * (Cr - 128));
|
|
Ye = 255 - clampTo8bit(Y + 1.772 * (Cb - 128));
|
|
}
|
|
data[offset++] = 255 - C;
|
|
data[offset++] = 255 - M;
|
|
data[offset++] = 255 - Ye;
|
|
data[offset++] = 255 - K;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
throw new Error("Unsupported color mode");
|
|
}
|
|
return data;
|
|
},
|
|
// @ts-ignore
|
|
copyToImageData: function copyToImageData(imageData) {
|
|
const width = imageData.width, height = imageData.height;
|
|
const imageDataArray = imageData.data;
|
|
const data = this.getData(width, height);
|
|
let i = 0, j = 0, x, y;
|
|
let Y, K, C, M, R, G, B;
|
|
switch (this.components.length) {
|
|
case 1:
|
|
for (y = 0; y < height; y++) {
|
|
for (x = 0; x < width; x++) {
|
|
Y = data[i++];
|
|
|
|
imageDataArray[j++] = Y;
|
|
imageDataArray[j++] = Y;
|
|
imageDataArray[j++] = Y;
|
|
imageDataArray[j++] = 255;
|
|
}
|
|
}
|
|
break;
|
|
case 3:
|
|
for (y = 0; y < height; y++) {
|
|
for (x = 0; x < width; x++) {
|
|
R = data[i++];
|
|
G = data[i++];
|
|
B = data[i++];
|
|
|
|
imageDataArray[j++] = R;
|
|
imageDataArray[j++] = G;
|
|
imageDataArray[j++] = B;
|
|
imageDataArray[j++] = 255;
|
|
}
|
|
}
|
|
break;
|
|
case 4:
|
|
for (y = 0; y < height; y++) {
|
|
for (x = 0; x < width; x++) {
|
|
C = data[i++];
|
|
M = data[i++];
|
|
Y = data[i++];
|
|
K = data[i++];
|
|
|
|
R = 255 - clampTo8bit(C * (1 - K / 255) + K);
|
|
G = 255 - clampTo8bit(M * (1 - K / 255) + K);
|
|
B = 255 - clampTo8bit(Y * (1 - K / 255) + K);
|
|
|
|
imageDataArray[j++] = R;
|
|
imageDataArray[j++] = G;
|
|
imageDataArray[j++] = B;
|
|
imageDataArray[j++] = 255;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
throw new Error("Unsupported color mode");
|
|
}
|
|
}
|
|
};
|
|
|
|
return constructor;
|
|
})();
|
|
|
|
export const decode = function (jpegData: Uint8Array, colorTransform: boolean = true): Image {
|
|
|
|
const arr = new Uint8Array(jpegData);
|
|
// @ts-ignore
|
|
const decoder = new JpegImage();
|
|
decoder.parse(arr);
|
|
decoder.colorTransform = colorTransform;
|
|
|
|
const image = new Image();
|
|
image.height = decoder.height
|
|
image.width = decoder.width
|
|
image.data = new Uint8Array(decoder.width * decoder.height * 4)
|
|
decoder.copyToImageData(image);
|
|
return image;
|
|
}
|