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https://github.com/photonstorm/phaser
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12 lines
432 B
JavaScript
12 lines
432 B
JavaScript
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/**
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* Multiplies or screens the colors, depending on the backdrop color.
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* Source colors overlay the backdrop while preserving its highlights and shadows.
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* The backdrop color is not replaced, but is mixed with the source color to reflect the lightness or darkness of the backdrop.
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*/
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var Overlay = function (a, b)
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{
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return (b < 128) ? (2 * a * b / 255) : (255 - 2 * (255 - a) * (255 - b) / 255);
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};
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module.exports = Overlay;
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