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Convert src/core/jpg.js to use standard classes

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*Please note:* Ignoring whitespace-only changes is probably necessary in order to review this.
This commit is contained in:
Jonas Jenwald 2021-05-05 12:43:28 +02:00
parent d0a299713c
commit 69dea39a42
1 changed files with 1275 additions and 1281 deletions
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46
src/core/jpg.js
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@ -44,7 +44,6 @@ class EOIMarkerError extends BaseException {}
* (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf) * (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf)
*/ */
const JpegImage = (function JpegImageClosure() {
// prettier-ignore // prettier-ignore
const dctZigZag = new Uint8Array([ const dctZigZag = new Uint8Array([
0, 0,
@ -73,12 +72,6 @@ const JpegImage = (function JpegImageClosure() {
const dctSqrt2 = 5793; // sqrt(2) const dctSqrt2 = 5793; // sqrt(2)
const dctSqrt1d2 = 2896; // sqrt(2) / 2 const dctSqrt1d2 = 2896; // sqrt(2) / 2
// eslint-disable-next-line no-shadow
function JpegImage({ decodeTransform = null, colorTransform = -1 } = {}) {
this._decodeTransform = decodeTransform;
this._colorTransform = colorTransform;
}
function buildHuffmanTable(codeLengths, values) { function buildHuffmanTable(codeLengths, values) {
let k = 0, let k = 0,
i, i,
@ -335,8 +328,7 @@ const JpegImage = (function JpegImageClosure() {
if (component.blockData[offsetZ]) { if (component.blockData[offsetZ]) {
component.blockData[offsetZ] += sign * (readBit() << successive); component.blockData[offsetZ] += sign * (readBit() << successive);
} else { } else {
component.blockData[offsetZ] = component.blockData[offsetZ] = successiveACNextValue << successive;
successiveACNextValue << successive;
successiveACState = 0; successiveACState = 0;
} }
break; break;
@ -749,7 +741,12 @@ const JpegImage = (function JpegImageClosure() {
}; };
} }
JpegImage.prototype = { class JpegImage {
constructor({ decodeTransform = null, colorTransform = -1 } = {}) {
this._decodeTransform = decodeTransform;
this._colorTransform = colorTransform;
}
parse(data, { dnlScanLines = null } = {}) { parse(data, { dnlScanLines = null } = {}) {
function readDataBlock() { function readDataBlock() {
const length = readUint16(data, offset); const length = readUint16(data, offset);
@ -1101,7 +1098,7 @@ const JpegImage = (function JpegImageClosure() {
} }
this.numComponents = this.components.length; this.numComponents = this.components.length;
return undefined; return undefined;
}, }
_getLinearizedBlockData(width, height, isSourcePDF = false) { _getLinearizedBlockData(width, height, isSourcePDF = false) {
const scaleX = this.width / width, const scaleX = this.width / width,
@ -1174,7 +1171,7 @@ const JpegImage = (function JpegImageClosure() {
} }
} }
return data; return data;
}, }
get _isColorConversionNeeded() { get _isColorConversionNeeded() {
if (this.adobe) { if (this.adobe) {
@ -1206,9 +1203,9 @@ const JpegImage = (function JpegImageClosure() {
return true; return true;
} }
return false; return false;
}, }
_convertYccToRgb: function convertYccToRgb(data) { _convertYccToRgb(data) {
let Y, Cb, Cr; let Y, Cb, Cr;
for (let i = 0, length = data.length; i < length; i += 3) { for (let i = 0, length = data.length; i < length; i += 3) {
Y = data[i]; Y = data[i];
@ -1219,9 +1216,9 @@ const JpegImage = (function JpegImageClosure() {
data[i + 2] = Y - 226.816 + 1.772 * Cb; data[i + 2] = Y - 226.816 + 1.772 * Cb;
} }
return data; return data;
}, }
_convertYcckToRgb: function convertYcckToRgb(data) { _convertYcckToRgb(data) {
let Y, Cb, Cr, k; let Y, Cb, Cr, k;
let offset = 0; let offset = 0;
for (let i = 0, length = data.length; i < length; i += 4) { for (let i = 0, length = data.length; i < length; i += 4) {
@ -1289,9 +1286,9 @@ const JpegImage = (function JpegImageClosure() {
} }
// Ensure that only the converted RGB data is returned. // Ensure that only the converted RGB data is returned.
return data.subarray(0, offset); return data.subarray(0, offset);
}, }
_convertYcckToCmyk: function convertYcckToCmyk(data) { _convertYcckToCmyk(data) {
let Y, Cb, Cr; let Y, Cb, Cr;
for (let i = 0, length = data.length; i < length; i += 4) { for (let i = 0, length = data.length; i < length; i += 4) {
Y = data[i]; Y = data[i];
@ -1303,9 +1300,9 @@ const JpegImage = (function JpegImageClosure() {
// K in data[i + 3] is unchanged // K in data[i + 3] is unchanged
} }
return data; return data;
}, }
_convertCmykToRgb: function convertCmykToRgb(data) { _convertCmykToRgb(data) {
let c, m, y, k; let c, m, y, k;
let offset = 0; let offset = 0;
for (let i = 0, length = data.length; i < length; i += 4) { for (let i = 0, length = data.length; i < length; i += 4) {
@ -1373,7 +1370,7 @@ const JpegImage = (function JpegImageClosure() {
} }
// Ensure that only the converted RGB data is returned. // Ensure that only the converted RGB data is returned.
return data.subarray(0, offset); return data.subarray(0, offset);
}, }
getData({ width, height, forceRGB = false, isSourcePDF = false }) { getData({ width, height, forceRGB = false, isSourcePDF = false }) {
if ( if (
@ -1415,10 +1412,7 @@ const JpegImage = (function JpegImageClosure() {
} }
} }
return data; return data;
}, }
}; }
return JpegImage;
})();
export { JpegImage }; export { JpegImage };