color-blend/dist/index.js

Blends RGBA colors with different blend modes

function n(n,r,t){return{r:255*t(n.r/255,r.r/255),g:255*t(n.g/255,r.g/255),b:255*t(n.b/255,r.b/255)}}function r(n,r){return r}function t(n,r){return n*r}function u(n,r){return n+r-n*r}function o(n,r){return f(r,n)}function e(n,r){return Math.min(n,r)}function i(n,r){return Math.min(Math.max(n,r),1)}function c(n,r){return 0===n?0:1===r?1:Math.min(1,n/(1-r))}function a(n,r){return 1===n?1:0===r?0:1-Math.min(1,(1-n)/r)}function f(n,r){return r<=.5?t(n,2*r):u(n,2*r-1)}function g(n,r){return r<=.5?n-(1-2*r)*n*(1-n):n+(2*r-1)*((n<=.25?((16*n-12)*n+4)*n:Math.sqrt(n))-n)}function b(n,r){return Math.abs(n-r)}function p(n,r){return n+r-2*n*r}function s(n,r,t){return Math.min(Math.max(n||0,r),t)}function h(n){return{r:s(n.r,0,255),g:s(n.g,0,255),b:s(n.b,0,255),a:s(n.a,0,1)}}function x(n){return{r:255*n.r,g:255*n.g,b:255*n.b,a:n.a}}function M(n){return{r:n.r/255,g:n.g/255,b:n.b/255,a:n.a}}function m(n,r){void 0===r&&(r=0);var t=Math.pow(10,r);return{r:Math.round(n.r*t)/t,g:Math.round(n.g*t)/t,b:Math.round(n.b*t)/t,a:n.a}}function d(n,r,t,u,o,e){return(1-r/t)*u+r/t*Math.round((1-n)*o+n*e)}function l(n,r,t,u,o){void 0===o&&(o={unitInput:!1,unitOutput:!1,roundOutput:!0}),o.unitInput&&(n=x(n),r=x(r)),n=h(n);var e=(r=h(r)).a+n.a-r.a*n.a,i=t(n,r,u),c=h({r:d(n.a,r.a,e,n.r,r.r,i.r),g:d(n.a,r.a,e,n.g,r.g,i.g),b:d(n.a,r.a,e,n.b,r.b,i.b),a:e});return o.unitOutput?M(c):o.roundOutput?m(c):m(c,9)}function v(n,r,t){return x(t(M(n),M(r)))}function O(n){return.3*n.r+.59*n.g+.11*n.b}function y(n,r){var t=r-O(n);return function(n){var r=O(n),t=n.r,u=n.g,o=n.b,e=Math.min(t,u,o),i=Math.max(t,u,o);function c(n){return r+(n-r)*r/(r-e)}function a(n){return r+(n-r)*(1-r)/(i-r)}return e<0&&(t=c(t),u=c(u),o=c(o)),i>1&&(t=a(t),u=a(u),o=a(o)),{r:t,g:u,b:o}}({r:n.r+t,g:n.g+t,b:n.b+t})}function I(n){return Math.max(n.r,n.g,n.b)-Math.min(n.r,n.g,n.b)}function L(n,r){var t=["r","g","b"].sort(function(r,t){return n[r]-n[t]}),u=t[0],o=t[1],e=t[2],i={r:n.r,g:n.g,b:n.b};return i[e]>i[u]?(i[o]=(i[o]-i[u])*r/(i[e]-i[u]),i[e]=r):i[o]=i[e]=0,i[u]=0,i}function k(n,r){return y(L(r,I(n)),O(n))}function q(n,r){return y(L(n,I(r)),O(n))}function w(n,r){return y(r,O(n))}function B(n,r){return y(n,O(r))}exports.color=function(n,r){return l(n,r,v,w)},exports.colorBurn=function(r,t){return l(r,t,n,a)},exports.colorDodge=function(r,t){return l(r,t,n,c)},exports.darken=function(r,t){return l(r,t,n,e)},exports.difference=function(r,t){return l(r,t,n,b)},exports.exclusion=function(r,t){return l(r,t,n,p)},exports.hardLight=function(r,t){return l(r,t,n,f)},exports.hue=function(n,r){return l(n,r,v,k)},exports.lighten=function(r,t){return l(r,t,n,i)},exports.luminosity=function(n,r){return l(n,r,v,B)},exports.multiply=function(r,u){return l(r,u,n,t)},exports.normal=function(t,u){return l(t,u,n,r)},exports.overlay=function(r,t){return l(r,t,n,o)},exports.saturation=function(n,r){return l(n,r,v,q)},exports.screen=function(r,t){return l(r,t,n,u)},exports.softLight=function(r,t){return l(r,t,n,g)};
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