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63 lines
2.4 KiB
JavaScript
63 lines
2.4 KiB
JavaScript
// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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'use strict';
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Components.utils.import("resource://gre/modules/Services.jsm");
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const ColorAnalyzer = Components.classes["@mozilla.org/places/colorAnalyzer;1"]
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.getService(Components.interfaces.mozIColorAnalyzer);
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this.EXPORTED_SYMBOLS = ["ColorUtils"];
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let ColorUtils = {
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/** Takes an icon and a success callback (who is expected to handle foreground color
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* & background color as is desired) The first argument to the callback is
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* the foreground/contrast color, the second is the background/primary/dominant one
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*/
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getForegroundAndBackgroundIconColors: function getForegroundAndBackgroundIconColors(aIconURI, aSuccessCallback, aErrorCallback) {
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if (!aIconURI) {
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return;
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}
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let that = this;
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let wrappedIcon = aIconURI;
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ColorAnalyzer.findRepresentativeColor(wrappedIcon, function (success, color) {
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if (!success) {
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aErrorCallback();
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} else {
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let foregroundColor = that.bestTextColorForContrast(color);
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let backgroundColor = that.convertDecimalToRgbColor(color);
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aSuccessCallback(foregroundColor, backgroundColor);
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}
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}, this);
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},
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/** returns the best color for text readability on top of aColor
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* return color is in rgb(r,g,b) format, suitable to csss
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* The color bightness algorithm is currently: http://www.w3.org/TR/AERT#color-contrast
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*/
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bestTextColorForContrast: function bestTextColorForContrast(aColor) {
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let r = (aColor & 0xff0000) >> 16;
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let g = (aColor & 0x00ff00) >> 8;
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let b = (aColor & 0x0000ff);
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let w3cContrastValue = ((r*299)+(g*587)+(b*114))/1000;
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w3cContrastValue = Math.round(w3cContrastValue);
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let textColor = "rgb(255,255,255)";
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if (w3cContrastValue > 125) {
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// bright/light, use black text
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textColor = "rgb(0,0,0)";
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}
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return textColor;
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},
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/**
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* converts a decimal(base10) number into rgb string
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*/
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convertDecimalToRgbColor: function convertDecimalToRgbColor(aColor) {
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let r = (aColor & 0xff0000) >> 16;
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let g = (aColor & 0x00ff00) >> 8;
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let b = (aColor & 0x0000ff);
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return "rgb("+r+","+g+","+b+")";
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}
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};
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