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