37 lines
827 B
JavaScript
37 lines
827 B
JavaScript
let setColor = (rgba,url) =>{
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return new Promise(resolve =>{
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var img = new Image();
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img.src = url;
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img.onload = () => {
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const width = img.width;
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const height = img.height;
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const canvas = docuemnt.createElement("canvas");
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canvas.width = width
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canvas.height = height
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var ctx = canvas.getContext("2d");
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ctx.drawImage(img,0,0)
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var data = ctx.getImageData(0,0,width,height)
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var num = 0;
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for (let i = 0; i < data.data.length; i+=4) {
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var r = data.data[i];
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var g = data.data[i+1];
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var b = data.data[i+2];
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var a = data.data[i+3];
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if(r + min < rgba[0]
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&& r + max > rgba[0]
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&& g + min < rgba[1]
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&& g + max > rgba[1]
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&& b + min < rgba[2]
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&& b + max > rgba[2]
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&& a == rgba[3]){
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num++
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}
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}
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resolve({
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width,height,num
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})
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}
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})
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};
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export default setColor |