1 |
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2 | (function (global, factory) {
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3 | typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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4 | typeof define === 'function' && define.amd ? define(factory) :
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5 | (global.FastAverageColor = factory());
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6 | }(this, (function () { 'use strict';
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7 |
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8 | function _classCallCheck(instance, Constructor) {
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9 | if (!(instance instanceof Constructor)) {
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10 | throw new TypeError("Cannot call a class as a function");
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11 | }
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12 | }
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13 |
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14 | function _defineProperties(target, props) {
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15 | for (var i = 0; i < props.length; i++) {
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16 | var descriptor = props[i];
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17 | descriptor.enumerable = descriptor.enumerable || false;
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18 | descriptor.configurable = true;
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19 | if ("value" in descriptor) descriptor.writable = true;
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20 | Object.defineProperty(target, descriptor.key, descriptor);
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21 | }
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22 | }
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23 |
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24 | function _createClass(Constructor, protoProps, staticProps) {
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25 | if (protoProps) _defineProperties(Constructor.prototype, protoProps);
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26 | if (staticProps) _defineProperties(Constructor, staticProps);
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27 | return Constructor;
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28 | }
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29 |
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30 | function isIgnoredColor(arr, num, ignoredColor) {
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31 | return arr[num] === ignoredColor[0] &&
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32 | arr[num + 1] === ignoredColor[1] &&
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33 | arr[num + 2] === ignoredColor[2] &&
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34 | arr[num + 3] === ignoredColor[3];
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35 | }
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36 |
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37 | function dominantAlgorithm(arr, len, options) {
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38 | var colorHash = {},
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39 | divider = 24,
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40 | ignoredColor = options.ignoredColor;
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41 |
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42 | for (var i = 0; i < len; i += options.step) {
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43 | var red = arr[i],
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44 | green = arr[i + 1],
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45 | blue = arr[i + 2],
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46 | alpha = arr[i + 3];
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47 |
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48 | if (ignoredColor && isIgnoredColor(arr, i, ignoredColor)) {
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49 | continue;
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50 | }
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51 |
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52 | var key = Math.round(red / divider) + ',' + Math.round(green / divider) + ',' + Math.round(blue / divider);
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53 |
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54 | if (colorHash[key]) {
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55 | colorHash[key] = [colorHash[key][0] + red * alpha, colorHash[key][1] + green * alpha, colorHash[key][2] + blue * alpha, colorHash[key][3] + alpha, colorHash[key][4] + 1];
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56 | } else {
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57 | colorHash[key] = [red * alpha, green * alpha, blue * alpha, alpha, 1];
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58 | }
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59 | }
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60 |
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61 | var buffer = Object.keys(colorHash).map(function (key) {
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62 | return colorHash[key];
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63 | }).sort(function (a, b) {
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64 | var countA = a[4],
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65 | countB = b[4];
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66 | return countA > countB ? -1 : countA === countB ? 0 : 1;
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67 | });
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68 | var max = buffer[0];
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69 | var redTotal = max[0];
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70 | var greenTotal = max[1];
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71 | var blueTotal = max[2];
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72 | var alphaTotal = max[3];
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73 | var count = max[4];
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74 | return alphaTotal ? [Math.round(redTotal / alphaTotal), Math.round(greenTotal / alphaTotal), Math.round(blueTotal / alphaTotal), Math.round(alphaTotal / count)] : options.defaultColor;
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75 | }
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76 |
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77 | function simpleAlgorithm(arr, len, options) {
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78 | var redTotal = 0,
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79 | greenTotal = 0,
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80 | blueTotal = 0,
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81 | alphaTotal = 0,
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82 | count = 0;
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83 | var ignoredColor = options.ignoredColor;
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84 |
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85 | for (var i = 0; i < len; i += options.step) {
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86 | var alpha = arr[i + 3],
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87 | red = arr[i] * alpha,
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88 | green = arr[i + 1] * alpha,
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89 | blue = arr[i + 2] * alpha;
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90 |
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91 | if (ignoredColor && isIgnoredColor(arr, i, ignoredColor)) {
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92 | continue;
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93 | }
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94 |
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95 | redTotal += red;
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96 | greenTotal += green;
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97 | blueTotal += blue;
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98 | alphaTotal += alpha;
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99 | count++;
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100 | }
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101 |
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102 | return alphaTotal ? [Math.round(redTotal / alphaTotal), Math.round(greenTotal / alphaTotal), Math.round(blueTotal / alphaTotal), Math.round(alphaTotal / count)] : options.defaultColor;
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103 | }
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104 |
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105 | function sqrtAlgorithm(arr, len, options) {
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106 | var redTotal = 0,
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107 | greenTotal = 0,
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108 | blueTotal = 0,
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109 | alphaTotal = 0,
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110 | count = 0;
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111 | var ignoredColor = options.ignoredColor;
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112 |
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113 | for (var i = 0; i < len; i += options.step) {
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114 | var red = arr[i],
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115 | green = arr[i + 1],
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116 | blue = arr[i + 2],
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117 | alpha = arr[i + 3];
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118 |
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119 | if (ignoredColor && isIgnoredColor(arr, i, options)) {
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120 | continue;
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121 | }
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122 |
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123 | redTotal += red * red * alpha;
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124 | greenTotal += green * green * alpha;
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125 | blueTotal += blue * blue * alpha;
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126 | alphaTotal += alpha;
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127 | count++;
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128 | }
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129 |
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130 | return alphaTotal ? [Math.round(Math.sqrt(redTotal / alphaTotal)), Math.round(Math.sqrt(greenTotal / alphaTotal)), Math.round(Math.sqrt(blueTotal / alphaTotal)), Math.round(alphaTotal / count)] : options.defaultColor;
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131 | }
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132 |
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133 | var ERROR_PREFIX = 'FastAverageColor: ';
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134 |
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135 | var FastAverageColor =
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136 |
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137 | function () {
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138 | function FastAverageColor() {
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139 | _classCallCheck(this, FastAverageColor);
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140 | }
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141 |
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142 | _createClass(FastAverageColor, [{
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143 | key: "getColorAsync",
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144 |
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145 | |
146 |
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147 |
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148 |
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149 |
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150 |
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151 |
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152 |
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153 |
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154 |
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155 |
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156 |
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157 |
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158 |
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159 |
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160 |
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161 |
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162 |
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163 | value: function getColorAsync(resource, options) {
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164 | if (!resource) {
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165 | return Promise.reject(Error("".concat(ERROR_PREFIX, "call .getColorAsync() without resource.")));
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166 | } else if (typeof resource === 'string') {
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167 | return this._bindImageEvents(new Image(resource), options);
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168 | } else if (resource.complete) {
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169 | var result = this.getColor(resource, options);
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170 | return result.error ? Promise.reject(result.error) : Promise.resolve(result);
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171 | } else {
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172 | return this._bindImageEvents(resource, options);
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173 | }
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174 | }
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175 | |
176 |
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177 |
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178 |
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179 |
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180 |
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181 |
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182 |
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183 |
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184 |
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185 |
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186 |
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187 |
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188 |
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189 |
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190 |
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191 |
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192 |
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193 |
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194 | }, {
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195 | key: "getColor",
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196 | value: function getColor(resource, options) {
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197 | options = options || {};
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198 |
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199 | var defaultColor = this._getDefaultColor(options);
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200 |
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201 | var value = defaultColor;
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202 |
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203 | if (!resource) {
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204 | this._outputError(options, 'call .getColor(null) without resource.');
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205 |
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206 | return this._prepareResult(defaultColor);
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207 | }
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208 |
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209 | var originalSize = this._getOriginalSize(resource),
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210 | size = this._prepareSizeAndPosition(originalSize, options);
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211 |
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212 | if (!size.srcWidth || !size.srcHeight || !size.destWidth || !size.destHeight) {
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213 | this._outputError(options, "incorrect sizes for resource \"".concat(resource.src, "\"."));
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214 |
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215 | return this._prepareResult(defaultColor);
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216 | }
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217 |
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218 | if (!this._ctx) {
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219 | this._canvas = this._makeCanvas();
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220 | this._ctx = this._canvas.getContext && this._canvas.getContext('2d');
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221 |
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222 | if (!this._ctx) {
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223 | this._outputError(options, 'Canvas Context 2D is not supported in this browser.');
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224 |
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225 | return this._prepareResult(defaultColor);
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226 | }
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227 | }
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228 |
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229 | this._canvas.width = size.destWidth;
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230 | this._canvas.height = size.destHeight;
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231 |
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232 | try {
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233 | this._ctx.clearRect(0, 0, size.destWidth, size.destHeight);
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234 |
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235 | this._ctx.drawImage(resource, size.srcLeft, size.srcTop, size.srcWidth, size.srcHeight, 0, 0, size.destWidth, size.destHeight);
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236 |
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237 | var bitmapData = this._ctx.getImageData(0, 0, size.destWidth, size.destHeight).data;
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238 |
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239 | value = this.getColorFromArray4(bitmapData, options);
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240 | } catch (e) {
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241 | this._outputError(options, "security error (CORS) for resource ".concat(resource.src, ".\nDetails: https://developer.mozilla.org/en/docs/Web/HTML/CORS_enabled_image"), e);
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242 | }
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243 |
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244 | return this._prepareResult(value);
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245 | }
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246 | |
247 |
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248 |
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249 |
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250 |
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251 |
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252 |
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253 |
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254 |
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255 |
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256 |
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257 |
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258 |
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259 | }, {
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260 | key: "getColorFromArray4",
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261 | value: function getColorFromArray4(arr, options) {
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262 | options = options || {};
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263 |
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264 | var bytesPerPixel = 4,
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265 | arrLength = arr.length,
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266 | defaultColor = this._getDefaultColor(options);
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267 |
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268 | if (arrLength < bytesPerPixel) {
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269 | return defaultColor;
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270 | }
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271 |
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272 | var len = arrLength - arrLength % bytesPerPixel,
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273 | step = (options.step || 1) * bytesPerPixel;
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274 | var algorithm;
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275 |
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276 | switch (options.algorithm || 'sqrt') {
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277 | case 'simple':
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278 | algorithm = simpleAlgorithm;
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279 | break;
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280 |
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281 | case 'sqrt':
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282 | algorithm = sqrtAlgorithm;
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283 | break;
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284 |
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285 | case 'dominant':
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286 | algorithm = dominantAlgorithm;
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287 | break;
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288 |
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289 | default:
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290 | throw Error("".concat(ERROR_PREFIX).concat(options.algorithm, " is unknown algorithm."));
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291 | }
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292 |
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293 | return algorithm(arr, len, {
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294 | defaultColor: defaultColor,
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295 | ignoredColor: options.ignoredColor,
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296 | step: step
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297 | });
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298 | }
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299 | |
300 |
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301 |
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302 |
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303 | }, {
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304 | key: "destroy",
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305 | value: function destroy() {
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306 | delete this._canvas;
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307 | delete this._ctx;
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308 | }
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309 | }, {
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310 | key: "_getDefaultColor",
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311 | value: function _getDefaultColor(options) {
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312 | return this._getOption(options, 'defaultColor', [0, 0, 0, 0]);
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313 | }
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314 | }, {
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315 | key: "_getOption",
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316 | value: function _getOption(options, name, defaultValue) {
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317 | return typeof options[name] === 'undefined' ? defaultValue : options[name];
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318 | }
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319 | }, {
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320 | key: "_prepareSizeAndPosition",
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321 | value: function _prepareSizeAndPosition(originalSize, options) {
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322 | var srcLeft = this._getOption(options, 'left', 0),
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323 | srcTop = this._getOption(options, 'top', 0),
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324 | srcWidth = this._getOption(options, 'width', originalSize.width),
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325 | srcHeight = this._getOption(options, 'height', originalSize.height),
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326 | destWidth = srcWidth,
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327 | destHeight = srcHeight;
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328 |
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329 | if (options.mode === 'precision') {
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330 | return {
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331 | srcLeft: srcLeft,
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332 | srcTop: srcTop,
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333 | srcWidth: srcWidth,
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334 | srcHeight: srcHeight,
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335 | destWidth: destWidth,
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336 | destHeight: destHeight
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337 | };
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338 | }
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339 |
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340 | var maxSize = 100,
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341 | minSize = 10;
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342 | var factor;
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343 |
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344 | if (srcWidth > srcHeight) {
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345 | factor = srcWidth / srcHeight;
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346 | destWidth = maxSize;
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347 | destHeight = Math.round(destWidth / factor);
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348 | } else {
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349 | factor = srcHeight / srcWidth;
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350 | destHeight = maxSize;
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351 | destWidth = Math.round(destHeight / factor);
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352 | }
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353 |
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354 | if (destWidth > srcWidth || destHeight > srcHeight || destWidth < minSize || destHeight < minSize) {
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355 | destWidth = srcWidth;
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356 | destHeight = srcHeight;
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357 | }
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358 |
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359 | return {
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360 | srcLeft: srcLeft,
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361 | srcTop: srcTop,
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362 | srcWidth: srcWidth,
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363 | srcHeight: srcHeight,
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364 | destWidth: destWidth,
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365 | destHeight: destHeight
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366 | };
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367 | }
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368 | }, {
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369 | key: "_bindImageEvents",
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370 | value: function _bindImageEvents(resource, options) {
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371 | var _this = this;
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372 |
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373 | return new Promise(function (resolve, reject) {
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374 | var onload = function onload() {
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375 | unbindEvents();
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376 |
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377 | var result = _this.getColor(resource, options);
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378 |
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379 | if (result.error) {
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380 | reject(result.error);
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381 | } else {
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382 | resolve(result);
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383 | }
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384 | },
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385 | onerror = function onerror() {
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386 | unbindEvents();
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387 | reject(Error("".concat(ERROR_PREFIX, "Error loading image ").concat(resource.src, ".")));
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388 | },
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389 | onabort = function onabort() {
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390 | unbindEvents();
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391 | reject(Error("".concat(ERROR_PREFIX, "Image \"").concat(resource.src, "\" loading aborted.")));
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392 | },
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393 | unbindEvents = function unbindEvents() {
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394 | resource.removeEventListener('load', onload);
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395 | resource.removeEventListener('error', onerror);
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396 | resource.removeEventListener('abort', onabort);
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397 | };
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398 |
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399 | resource.addEventListener('load', onload);
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400 | resource.addEventListener('error', onerror);
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401 | resource.addEventListener('abort', onabort);
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402 | });
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403 | }
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404 | }, {
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405 | key: "_prepareResult",
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406 | value: function _prepareResult(value) {
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407 | var rgb = value.slice(0, 3),
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408 | rgba = [].concat(rgb, value[3] / 255),
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409 | isDark = this._isDark(value);
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410 |
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411 | return {
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412 | value: value,
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413 | rgb: 'rgb(' + rgb.join(',') + ')',
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414 | rgba: 'rgba(' + rgba.join(',') + ')',
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415 | hex: this._arrayToHex(rgb),
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416 | hexa: this._arrayToHex(value),
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417 | isDark: isDark,
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418 | isLight: !isDark
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419 | };
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420 | }
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421 | }, {
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422 | key: "_getOriginalSize",
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423 | value: function _getOriginalSize(resource) {
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424 | if (resource instanceof HTMLImageElement) {
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425 | return {
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426 | width: resource.naturalWidth,
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427 | height: resource.naturalHeight
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428 | };
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429 | }
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430 |
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431 | if (resource instanceof HTMLVideoElement) {
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432 | return {
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433 | width: resource.videoWidth,
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434 | height: resource.videoHeight
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435 | };
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436 | }
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437 |
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438 | return {
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439 | width: resource.width,
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440 | height: resource.height
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441 | };
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442 | }
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443 | }, {
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444 | key: "_toHex",
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445 | value: function _toHex(num) {
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446 | var str = num.toString(16);
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447 | return str.length === 1 ? '0' + str : str;
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448 | }
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449 | }, {
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450 | key: "_arrayToHex",
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451 | value: function _arrayToHex(arr) {
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452 | return '#' + arr.map(this._toHex).join('');
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453 | }
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454 | }, {
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455 | key: "_isDark",
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456 | value: function _isDark(color) {
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457 |
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458 | var result = (color[0] * 299 + color[1] * 587 + color[2] * 114) / 1000;
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459 | return result < 128;
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460 | }
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461 | }, {
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462 | key: "_makeCanvas",
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463 | value: function _makeCanvas() {
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464 | return typeof window === 'undefined' ? new OffscreenCanvas(1, 1) : document.createElement('canvas');
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465 | }
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466 | }, {
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467 | key: "_outputError",
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468 | value: function _outputError(options, error, details) {
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469 | if (!options.silent) {
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470 | console.error("".concat(ERROR_PREFIX).concat(error));
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471 |
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472 | if (details) {
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473 | console.error(details);
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474 | }
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475 | }
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476 | }
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477 | }]);
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478 |
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479 | return FastAverageColor;
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480 | }();
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481 |
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482 | return FastAverageColor;
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483 |
|
484 | })));
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