Refactors Lab CS; uses different conversion for D50 and D65; adds getRgbItem
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Yury Delendik
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223ad0c117
commit
0dc137a0df
@ -25,19 +25,26 @@ var ColorSpace = (function ColorSpaceClosure() {
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ColorSpace.prototype = {
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/**
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* Converts src array items representing color components values starting
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* from srcOffset to RGB color. Returns the array of the rgb components
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* items, each value ranging from [0,255].
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* Converts the color value to the RGB color. The color components are
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* located in the src array starting from the srcOffset. Returns the array
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* of the rgb components, each value ranging from [0,255].
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*/
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getRgb: function ColorSpace_getRgb(src, srcOffset) {
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error('Should not call ColorSpace.getRgb');
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},
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/**
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* Converts src array items representing color components values starting
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* from srcOffset to RGB colors. The src is Uint8Array with the items that
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* represent color components values, each value scaled to [0, 2^bits).
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* Only count amount of values with be converted and placed into dest array
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* starting from destOffset offset, each value scaled to [0,255].
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* Converts the color value to the RGB color, similar to the getRgb method.
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* The result placed into the dest array starting from the destOffset.
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*/
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getRgbItem: function ColorSpace_getRgb(src, srcOffset, dest, destOffset) {
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error('Should not call ColorSpace.getRgbItem');
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},
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/**
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* Converts the specified number of the color values to the RGB colors.
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* The colors are located in the src array starting from the srcOffset.
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* The result is placed into the dest array starting from the destOffset.
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* The src array items shall be in [0,2^bits) range, the dest array items
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* will be in [0,255] range.
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*/
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getRgbBuffer: function ColorSpace_getRgbBuffer(src, srcOffset, count,
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dest, destOffset, bits) {
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@ -57,9 +64,8 @@ var ColorSpace = (function ColorSpaceClosure() {
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return false;
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},
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/**
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* Converts src array items representing color components values starting
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* from srcOffset to RGB colors similar to the getRgbBuffer. Returns
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* the created buffer.
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* Creates the output buffer and converts the specified number of the color
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* values to the RGB colors, similar to the getRgbBuffer.
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*/
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createRgbBuffer: function ColorSpace_createRgbBuffer(src, srcOffset,
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count, bits) {
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@ -263,12 +269,18 @@ var AlternateCS = (function AlternateCSClosure() {
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AlternateCS.prototype = {
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getRgb: function AlternateCS_getRgb(src, srcOffset) {
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var rgb = new Uint8Array(3);
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this.getRgbItem(src, srcOffset, rgb, 0);
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return rgb;
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},
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getRgbItem: function AlternateCS_getRgbItem(src, srcOffset,
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dest, destOffset) {
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var baseNumComps = this.base.numComps;
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var input = 'subarray' in src ?
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src.subarray(srcOffset, srcOffset + this.numComps) :
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Array.prototype.slice.call(src, srcOffset, srcOffset + this.numComps);
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var tinted = this.tintFn(input);
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return this.base.getRgb(tinted, 0);
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this.base.getRgbItem(tinted, 0, dest, destOffset);
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},
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getRgbBuffer: function AlternateCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset, bits) {
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@ -276,7 +288,8 @@ var AlternateCS = (function AlternateCSClosure() {
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var base = this.base;
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var scale = 1 / ((1 << bits) - 1);
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var baseNumComps = base.numComps;
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var isPassthrough = base.isPassthrough(8);
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var isGetRgbBufferSupported = 'getRgbBuffer' in base;
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var isPassthrough = base.isPassthrough(8) || !isGetRgbBufferSupported;
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var pos = isPassthrough ? destOffset : 0;
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var baseBuf = isPassthrough ? dest : new Uint8Array(baseNumComps * count);
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var numComps = this.numComps;
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@ -287,8 +300,13 @@ var AlternateCS = (function AlternateCSClosure() {
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scaled[j] = src[srcOffset++] * scale;
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}
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var tinted = tintFn(scaled);
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for (var j = 0; j < baseNumComps; j++) {
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baseBuf[pos++] = tinted[j] * 255;
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if (isGetRgbBufferSupported) {
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for (var j = 0; j < baseNumComps; j++) {
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baseBuf[pos++] = tinted[j] * 255;
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}
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} else {
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base.getRgbItem(tinted, 0, baseBuf, pos);
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pos += baseNumComps;
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}
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}
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if (!isPassthrough) {
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@ -353,6 +371,12 @@ var IndexedCS = (function IndexedCSClosure() {
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var start = src[srcOffset] * numComps;
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return this.base.getRgb(this.lookup, start);
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},
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getRgbItem: function IndexedCS_getRgbItem(src, srcOffset,
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dest, destOffset) {
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var numComps = this.base.numComps;
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var start = src[srcOffset] * numComps;
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this.base.getRgbItem(this.lookup, start, dest, destOffset);
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},
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getRgbBuffer: function IndexedCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset) {
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var base = this.base;
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@ -388,9 +412,15 @@ var DeviceGrayCS = (function DeviceGrayCSClosure() {
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DeviceGrayCS.prototype = {
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getRgb: function DeviceGrayCS_getRgb(src, srcOffset) {
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var rgb = new Uint8Array(3);
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this.getRgbItem(src, srcOffset, rgb, 0);
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return rgb;
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},
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getRgbItem: function DeviceGrayCS_getRgbItem(src, srcOffset,
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dest, destOffset) {
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var c = (src[srcOffset] * 255) | 0;
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c = c < 0 ? 0 : c > 255 ? 255 : c;
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return new Uint8Array([c, c, c]);
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dest[destOffset] = dest[destOffset + 1] = dest[destOffset + 2] = c;
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},
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getRgbBuffer: function DeviceGrayCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset, bits) {
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@ -423,14 +453,18 @@ var DeviceRgbCS = (function DeviceRgbCSClosure() {
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}
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DeviceRgbCS.prototype = {
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getRgb: function DeviceRgbCS_getRgb(src, srcOffset) {
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var rgb = new Uint8Array(3);
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this.getRgbItem(src, srcOffset, rgb, 0);
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return rgb;
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},
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getRgbItem: function DeviceRgbCS_getRgbItem(src, srcOffset,
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dest, destOffset) {
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var r = src[srcOffset] * 255;
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var g = src[srcOffset + 1] * 255;
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var b = src[srcOffset + 2] * 255;
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var rgb = new Uint8Array(3);
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rgb[0] = r < 0 ? 0 : r > 255 ? 255 : r;
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rgb[1] = g < 0 ? 0 : g > 255 ? 255 : g;
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rgb[2] = b < 0 ? 0 : b > 255 ? 255 : b;
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return rgb;
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dest[destOffset] = r < 0 ? 0 : r > 255 ? 255 : r;
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dest[destOffset + 1] = g < 0 ? 0 : g > 255 ? 255 : g;
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dest[destOffset + 2] = b < 0 ? 0 : b > 255 ? 255 : b;
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},
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getRgbBuffer: function DeviceRgbCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset, bits) {
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@ -1183,6 +1217,10 @@ var DeviceCmykCS = (function DeviceCmykCSClosure() {
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convertToRgb(src, srcOffset, 1, rgb, 0);
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return rgb;
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},
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getRgbItem: function DeviceCmykCS_getRgbItem(src, srcOffset,
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dest, destOffset) {
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convertToRgb(src, srcOffset, 1, dest, destOffset);
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},
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getRgbBuffer: function DeviceCmykCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset, bits) {
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var scale = 1 / ((1 << bits) - 1);
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@ -1253,7 +1291,7 @@ var LabCS = (function LabCSClosure() {
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};
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// Function g(x) from spec
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function g(x) {
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function fn_g(x) {
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if (x >= 6 / 29)
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return x * x * x;
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else
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@ -1267,31 +1305,37 @@ var LabCS = (function LabCSClosure() {
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var bs = src[srcOffset + 2];
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// Adjust limits of 'as' and 'bs'
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as = as > cs.amax ? cs.amax : as;
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as = as < cs.amin ? cs.amin : as;
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bs = bs > cs.bmax ? cs.bmax : bs;
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bs = bs < cs.bmin ? cs.bmin : bs;
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as = as > cs.amax ? cs.amax : as < cs.amin ? cs.amin : as;
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bs = bs > cs.bmax ? cs.bmax : bs < cs.bmin ? cs.bmin : bs;
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// Computes intermediate variables X,Y,Z as per spec
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var M = (Ls + 16) / 116;
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var L = M + (as / 500);
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var N = M - (bs / 200);
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var X = cs.XW * g(L);
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var Y = cs.YW * g(M);
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var Z = cs.ZW * g(N);
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// XYZ to RGB 3x3 matrix, from:
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// http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC18
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var XYZtoRGB = [3.240479, -1.537150, -0.498535,
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-0.969256, 1.875992, 0.041556,
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0.055648, -0.204043, 1.057311];
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var X = cs.XW * fn_g(L);
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var Y = cs.YW * fn_g(M);
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var Z = cs.ZW * fn_g(N);
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var rgb = Util.apply3dTransform(XYZtoRGB, [X, Y, Z]);
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var r, g, b;
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// Using different conversions for D50 and D65 white points,
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// per http://www.color.org/srgb.pdf
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if (cs.ZW < 1) {
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// Assuming D50 (X=0.9642, Y=1.00, Z=0.8249)
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r = X * 3.1339 + Y * -1.6170 + Z * -0.4906;
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g = X * -0.9785 + Y * 1.9160 + Z * 0.0333;
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b = X * 0.0720 + Y * -0.2290 + Z * 1.4057;
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} else {
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// Assuming D65 (X=0.9505, Y=1.00, Z=1.0888)
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r = X * 3.2406 + Y * -1.5372 + Z * -0.4986;
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g = X * -0.9689 + Y * 1.8758 + Z * 0.0415;
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b = X * 0.0557 + Y * -0.2040 + Z * 1.0570;
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}
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// clamp color values to [0,255] range
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dest[destOffset] = rgb[0] < 0 ? 0 : rgb[0] > 1 ? 255 : rgb[0] * 255;
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dest[destOffset + 1] = rgb[1] < 0 ? 0 : rgb[1] > 1 ? 255 : rgb[1] * 255;
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dest[destOffset + 2] = rgb[2] < 0 ? 0 : rgb[2] > 1 ? 255 : rgb[2] * 255;
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dest[destOffset] = r < 0 ? 0 : r > 1 ? 255 : r * 255;
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dest[destOffset + 1] = g < 0 ? 0 : g > 1 ? 255 : g * 255;
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dest[destOffset + 2] = b < 0 ? 0 : b > 1 ? 255 : b * 255;
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}
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LabCS.prototype = {
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@ -1300,21 +1344,13 @@ var LabCS = (function LabCSClosure() {
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convertToRgb(this, src, srcOffset, rgb, 0);
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return rgb;
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},
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getRgbBuffer: function LabCS_getRgbBuffer(src, srcOffset, count,
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dest, destOffset) {
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for (var i = 0; i < count; ++i) {
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convertToRgb(this, src, srcOffset, dest, destOffset);
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srcOffset += 3;
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destOffset += 3;
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}
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return rgbBuf;
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getRgbItem: function LabCS_getRgbItem(src, srcOffset, dest, destOffset) {
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convertToRgb(this, src, srcOffset, dest, destOffset);
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},
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getOutputLength: function LabCS_getOutputLength(inputLength) {
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return inputLength;
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},
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isPassthrough: ColorSpace.prototype.isPassthrough,
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createRgbBuffer: ColorSpace.prototype.createRgbBuffer,
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isDefaultDecode: function LabCS_isDefaultDecode(decodeMap) {
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// From Table 90 in Adobe's:
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// "Document management - Portable document format", 1st ed, 2008
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1
test/pdfs/issue1998.pdf.link
Normal file
1
test/pdfs/issue1998.pdf.link
Normal file
@ -0,0 +1 @@
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http://www.uctc.net/access/30/Access%2030%20-%2002%20-%20Horse%20Power.pdf
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@ -735,6 +735,14 @@
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"rounds": 1,
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"type": "load"
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},
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{ "id": "issue1998",
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"file": "pdfs/issue1998.pdf",
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"md5": "586e0213be2f461360ec26770b5a4e48",
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"rounds": 1,
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"pageLimit": 2,
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"link": true,
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"type": "load"
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},
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{ "id": "issue1878",
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"file": "pdfs/issue1878.pdf",
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"md5": "b4fb0ce7c19368e7104dce3d0d34bcb3",
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