Merge pull request #8778 from Snuffleupagus/jpg-Uint8ClampedArray
Use `Uint8ClampedArray`, when returning data, and remove manual clamping in `src/core/jpg.js` (issue 4901)
This commit is contained in:
Tim van der Meij
GitHub
commit
602250031e
@ -7,6 +7,7 @@
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"babel-loader": "^6.4.0",
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"babel-plugin-transform-es2015-modules-commonjs": "^6.23.0",
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"babel-preset-es2015": "^6.24.1",
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"core-js": "^2.5.0",
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"escodegen": "^1.8.0",
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"eslint": "^4.2.0",
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"eslint-plugin-mozilla": "^0.4.0",
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@ -600,10 +600,6 @@ var JpegImage = (function JpegImageClosure() {
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return component.blockData;
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}
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function clamp0to255(a) {
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return a <= 0 ? 0 : a >= 255 ? 255 : a;
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}
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function findNextFileMarker(data, currentPos, startPos) {
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function peekUint16(pos) {
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return (data[pos] << 8) | data[pos + 1];
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@ -919,7 +915,7 @@ var JpegImage = (function JpegImageClosure() {
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var output;
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var numComponents = this.components.length;
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var dataLength = width * height * numComponents;
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var data = new Uint8Array(dataLength);
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var data = new Uint8ClampedArray(dataLength);
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var xScaleBlockOffset = new Uint32Array(width);
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var mask3LSB = 0xfffffff8; // used to clear the 3 LSBs
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@ -985,12 +981,12 @@ var JpegImage = (function JpegImageClosure() {
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_convertYccToRgb: function convertYccToRgb(data) {
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var Y, Cb, Cr;
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for (var i = 0, length = data.length; i < length; i += 3) {
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Y = data[i ];
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Y = data[i];
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Cb = data[i + 1];
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Cr = data[i + 2];
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data[i ] = clamp0to255(Y - 179.456 + 1.402 * Cr);
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data[i + 1] = clamp0to255(Y + 135.459 - 0.344 * Cb - 0.714 * Cr);
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data[i + 2] = clamp0to255(Y - 226.816 + 1.772 * Cb);
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data[i] = Y - 179.456 + 1.402 * Cr;
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data[i + 1] = Y + 135.459 - 0.344 * Cb - 0.714 * Cr;
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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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@ -999,12 +995,12 @@ var JpegImage = (function JpegImageClosure() {
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var Y, Cb, Cr, k;
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var offset = 0;
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for (var i = 0, length = data.length; i < length; i += 4) {
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Y = data[i];
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Y = data[i];
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Cb = data[i + 1];
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Cr = data[i + 2];
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k = data[i + 3];
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var r = -122.67195406894 +
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data[offset++] = -122.67195406894 +
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Cb * (-6.60635669420364e-5 * Cb + 0.000437130475926232 * Cr -
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5.4080610064599e-5 * Y + 0.00048449797120281 * k -
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0.154362151871126) +
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@ -1014,7 +1010,7 @@ var JpegImage = (function JpegImageClosure() {
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0.48357088451265) +
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k * (-0.000336197177618394 * k + 0.484791561490776);
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var g = 107.268039397724 +
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data[offset++] = 107.268039397724 +
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Cb * (2.19927104525741e-5 * Cb - 0.000640992018297945 * Cr +
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0.000659397001245577 * Y + 0.000426105652938837 * k -
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0.176491792462875) +
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@ -1024,7 +1020,7 @@ var JpegImage = (function JpegImageClosure() {
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0.25802910206845) +
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k * (-0.000318913117588328 * k - 0.213742400323665);
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var b = -20.810012546947 +
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data[offset++] = -20.810012546947 +
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Cb * (-0.000570115196973677 * Cb - 2.63409051004589e-5 * Cr +
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0.0020741088115012 * Y - 0.00288260236853442 * k +
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0.814272968359295) +
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@ -1033,10 +1029,6 @@ var JpegImage = (function JpegImageClosure() {
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Y * (0.00174418132927582 * Y - 0.00255243321439347 * k +
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0.116935020465145) +
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k * (-0.000343531996510555 * k + 0.24165260232407);
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data[offset++] = clamp0to255(r);
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data[offset++] = clamp0to255(g);
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data[offset++] = clamp0to255(b);
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}
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return data;
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},
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@ -1044,12 +1036,12 @@ var JpegImage = (function JpegImageClosure() {
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_convertYcckToCmyk: function convertYcckToCmyk(data) {
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var Y, Cb, Cr;
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for (var i = 0, length = data.length; i < length; i += 4) {
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Y = data[i];
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Y = data[i];
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Cb = data[i + 1];
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Cr = data[i + 2];
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data[i ] = clamp0to255(434.456 - Y - 1.402 * Cr);
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data[i + 1] = clamp0to255(119.541 - Y + 0.344 * Cb + 0.714 * Cr);
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data[i + 2] = clamp0to255(481.816 - Y - 1.772 * Cb);
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data[i] = 434.456 - Y - 1.402 * Cr;
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data[i + 1] = 119.541 - Y + 0.344 * Cb + 0.714 * Cr;
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data[i + 2] = 481.816 - Y - 1.772 * Cb;
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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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@ -1058,45 +1050,42 @@ var JpegImage = (function JpegImageClosure() {
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_convertCmykToRgb: function convertCmykToRgb(data) {
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var c, m, y, k;
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var offset = 0;
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var min = -255 * 255 * 255;
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var scale = 1 / 255 / 255;
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var scale = 1 / 255;
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for (var i = 0, length = data.length; i < length; i += 4) {
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c = data[i];
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m = data[i + 1];
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y = data[i + 2];
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k = data[i + 3];
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c = data[i] * scale;
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m = data[i + 1] * scale;
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y = data[i + 2] * scale;
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k = data[i + 3] * scale;
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var r =
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data[offset++] = 255 +
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c * (-4.387332384609988 * c + 54.48615194189176 * m +
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18.82290502165302 * y + 212.25662451639585 * k -
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72734.4411664936) +
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285.2331026137004) +
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m * (1.7149763477362134 * m - 5.6096736904047315 * y -
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17.873870861415444 * k - 1401.7366389350734) +
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17.873870861415444 * k - 5.497006427196366) +
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y * (-2.5217340131683033 * y - 21.248923337353073 * k +
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4465.541406466231) -
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k * (21.86122147463605 * k + 48317.86113160301);
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var g =
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17.5119270841813) -
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k * (21.86122147463605 * k + 189.48180835922747);
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data[offset++] = 255 +
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c * (8.841041422036149 * c + 60.118027045597366 * m +
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6.871425592049007 * y + 31.159100130055922 * k -
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20220.756542821975) +
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79.2970844816548) +
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m * (-15.310361306967817 * m + 17.575251261109482 * y +
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131.35250912493976 * k - 48691.05921601825) +
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131.35250912493976 * k - 190.9453302588951) +
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y * (4.444339102852739 * y + 9.8632861493405 * k -
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6341.191035517494) -
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k * (20.737325471181034 * k + 47890.15695978492);
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var b =
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24.86741582555878) -
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k * (20.737325471181034 * k + 187.80453709719578);
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data[offset++] = 255 +
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c * (0.8842522430003296 * c + 8.078677503112928 * m +
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30.89978309703729 * y - 0.23883238689178934 * k -
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3616.812083916688) +
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14.183576799673286) +
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m * (10.49593273432072 * m + 63.02378494754052 * y +
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50.606957656360734 * k - 28620.90484698408) +
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50.606957656360734 * k - 112.23884253719248) +
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y * (0.03296041114873217 * y + 115.60384449646641 * k -
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49363.43385999684) -
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k * (22.33816807309886 * k + 45932.16563550634);
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data[offset++] = r >= 0 ? 255 : r <= min ? 0 : 255 + r * scale | 0;
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data[offset++] = g >= 0 ? 255 : g <= min ? 0 : 255 + g * scale | 0;
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data[offset++] = b >= 0 ? 255 : b <= min ? 0 : 255 + b * scale | 0;
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193.58209356861505) -
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k * (22.33816807309886 * k + 180.12613974708367);
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}
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return data;
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},
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@ -1110,7 +1099,7 @@ var JpegImage = (function JpegImageClosure() {
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if (this.numComponents === 1 && forceRGBoutput) {
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var dataLength = data.length;
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var rgbData = new Uint8Array(dataLength * 3);
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var rgbData = new Uint8ClampedArray(dataLength * 3);
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var offset = 0;
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for (var i = 0; i < dataLength; i++) {
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var grayColor = data[i];
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@ -53,6 +53,12 @@ PDFJS.compatibilityChecked = true;
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// Checking if the typed arrays are supported
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// Support: iOS<6.0 (subarray), IE<10, Android<4.0
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(function checkTypedArrayCompatibility() {
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if (typeof Uint8ClampedArray === 'undefined') {
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// Support: IE<11
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globalScope.Uint8ClampedArray =
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require('core-js/fn/typed/uint8-clamped-array');
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}
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if (typeof Uint8Array !== 'undefined') {
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// Support: iOS<6.0
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if (typeof Uint8Array.prototype.subarray === 'undefined') {
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@ -50,6 +50,7 @@
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'pdfjs-web': new URL('web', baseLocation).href,
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'pdfjs-test': new URL('test', baseLocation).href,
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'pdfjs-lib': new URL('src/pdf', baseLocation).href,
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'core-js': new URL('node_modules/core-js', baseLocation).href,
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},
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meta: {
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'*': {
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@ -44,10 +44,6 @@ See https://github.com/adobe-type-tools/cmap-resources
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<link rel="resource" type="application/l10n" href="locale/locale.properties">
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<!--#endif-->
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<!--#if !PRODUCTION-->
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<script src="../src/shared/compatibility.js"></script>
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<!--#endif-->
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<!--#if !PRODUCTION-->
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<script src="../node_modules/systemjs/dist/system.js"></script>
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<script src="../systemjs.config.js"></script>
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