Convert src/core/jpg.js to use standard classes
*Please note:* Ignoring whitespace-only changes is probably necessary in order to review this.
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Jonas Jenwald
parent
d0a299713c
commit
69dea39a42
100
src/core/jpg.js
100
src/core/jpg.js
@ -44,9 +44,8 @@ class EOIMarkerError extends BaseException {}
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* (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf)
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*/
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const JpegImage = (function JpegImageClosure() {
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// prettier-ignore
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const dctZigZag = new Uint8Array([
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// prettier-ignore
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const dctZigZag = new Uint8Array([
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0,
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1, 8,
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16, 9, 2,
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@ -64,22 +63,16 @@ const JpegImage = (function JpegImageClosure() {
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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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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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// eslint-disable-next-line no-shadow
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function JpegImage({ decodeTransform = null, colorTransform = -1 } = {}) {
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this._decodeTransform = decodeTransform;
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this._colorTransform = colorTransform;
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}
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function buildHuffmanTable(codeLengths, values) {
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function buildHuffmanTable(codeLengths, values) {
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let k = 0,
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i,
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j,
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@ -114,13 +107,13 @@ const JpegImage = (function JpegImageClosure() {
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}
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}
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return code[0].children;
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}
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}
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function getBlockBufferOffset(component, row, col) {
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function getBlockBufferOffset(component, row, col) {
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return 64 * ((component.blocksPerLine + 1) * row + col);
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}
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}
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function decodeScan(
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function decodeScan(
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data,
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offset,
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frame,
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@ -131,7 +124,7 @@ const JpegImage = (function JpegImageClosure() {
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successivePrev,
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successive,
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parseDNLMarker = false
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) {
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) {
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const mcusPerLine = frame.mcusPerLine;
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const progressive = frame.progressive;
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@ -335,8 +328,7 @@ const JpegImage = (function JpegImageClosure() {
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if (component.blockData[offsetZ]) {
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component.blockData[offsetZ] += sign * (readBit() << successive);
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} else {
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component.blockData[offsetZ] =
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successiveACNextValue << successive;
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component.blockData[offsetZ] = successiveACNextValue << successive;
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successiveACState = 0;
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}
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break;
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@ -459,14 +451,14 @@ const JpegImage = (function JpegImageClosure() {
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}
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return offset - startOffset;
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}
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}
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// A port of poppler's IDCT method which in turn is taken from:
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// Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz,
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// 'Practical Fast 1-D DCT Algorithms with 11 Multiplications',
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// IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989,
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// 988-991.
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function quantizeAndInverse(component, blockBufferOffset, p) {
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// A port of poppler's IDCT method which in turn is taken from:
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// Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz,
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// 'Practical Fast 1-D DCT Algorithms with 11 Multiplications',
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// IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989,
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// 988-991.
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function quantizeAndInverse(component, blockBufferOffset, p) {
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const qt = component.quantizationTable,
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blockData = component.blockData;
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let v0, v1, v2, v3, v4, v5, v6, v7;
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@ -704,9 +696,9 @@ const JpegImage = (function JpegImageClosure() {
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blockData[blockBufferOffset + col + 48] = p6;
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blockData[blockBufferOffset + col + 56] = p7;
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}
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}
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}
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function buildComponentData(frame, component) {
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function buildComponentData(frame, component) {
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const blocksPerLine = component.blocksPerLine;
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const blocksPerColumn = component.blocksPerColumn;
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const computationBuffer = new Int16Array(64);
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@ -718,9 +710,9 @@ const JpegImage = (function JpegImageClosure() {
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}
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}
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return component.blockData;
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}
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}
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function findNextFileMarker(data, currentPos, startPos = currentPos) {
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function findNextFileMarker(data, currentPos, startPos = currentPos) {
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const maxPos = data.length - 1;
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let newPos = startPos < currentPos ? startPos : currentPos;
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@ -747,9 +739,14 @@ const JpegImage = (function JpegImageClosure() {
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marker: newMarker,
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offset: newPos,
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};
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}
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class JpegImage {
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constructor({ decodeTransform = null, colorTransform = -1 } = {}) {
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this._decodeTransform = decodeTransform;
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this._colorTransform = colorTransform;
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}
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JpegImage.prototype = {
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parse(data, { dnlScanLines = null } = {}) {
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function readDataBlock() {
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const length = readUint16(data, offset);
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@ -1101,7 +1098,7 @@ const JpegImage = (function JpegImageClosure() {
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}
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this.numComponents = this.components.length;
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return undefined;
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},
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}
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_getLinearizedBlockData(width, height, isSourcePDF = false) {
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const scaleX = this.width / width,
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@ -1174,7 +1171,7 @@ const JpegImage = (function JpegImageClosure() {
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}
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}
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return data;
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},
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}
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get _isColorConversionNeeded() {
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if (this.adobe) {
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@ -1206,9 +1203,9 @@ const JpegImage = (function JpegImageClosure() {
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return true;
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}
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return false;
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},
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}
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_convertYccToRgb: function convertYccToRgb(data) {
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_convertYccToRgb(data) {
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let Y, Cb, Cr;
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for (let i = 0, length = data.length; i < length; i += 3) {
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Y = data[i];
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@ -1219,9 +1216,9 @@ const JpegImage = (function JpegImageClosure() {
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data[i + 2] = Y - 226.816 + 1.772 * Cb;
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}
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return data;
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},
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}
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_convertYcckToRgb: function convertYcckToRgb(data) {
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_convertYcckToRgb(data) {
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let Y, Cb, Cr, k;
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let offset = 0;
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for (let i = 0, length = data.length; i < length; i += 4) {
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@ -1289,9 +1286,9 @@ const JpegImage = (function JpegImageClosure() {
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}
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// Ensure that only the converted RGB data is returned.
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return data.subarray(0, offset);
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},
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}
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_convertYcckToCmyk: function convertYcckToCmyk(data) {
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_convertYcckToCmyk(data) {
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let Y, Cb, Cr;
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for (let i = 0, length = data.length; i < length; i += 4) {
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Y = data[i];
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@ -1303,9 +1300,9 @@ const JpegImage = (function JpegImageClosure() {
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// K in data[i + 3] is unchanged
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}
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return data;
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},
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}
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_convertCmykToRgb: function convertCmykToRgb(data) {
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_convertCmykToRgb(data) {
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let c, m, y, k;
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let offset = 0;
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for (let i = 0, length = data.length; i < length; i += 4) {
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@ -1373,7 +1370,7 @@ const JpegImage = (function JpegImageClosure() {
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}
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// Ensure that only the converted RGB data is returned.
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return data.subarray(0, offset);
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},
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}
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getData({ width, height, forceRGB = false, isSourcePDF = false }) {
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if (
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@ -1415,10 +1412,7 @@ const JpegImage = (function JpegImageClosure() {
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}
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}
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return data;
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},
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};
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return JpegImage;
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})();
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}
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}
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export { JpegImage };
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