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