From cd1917c66d6f812b7973928aa4efe24c3ee848ed Mon Sep 17 00:00:00 2001
From: Vilius <www.viliusl@gmail.com>
Date: Fri, 11 Aug 2017 20:12:35 +0300
Subject: [PATCH] #6 - fixed on_finish param handling - it must be optional

---
 dist/hermite.js |  4 ++--
 src/hermite.js  | 10 +++++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/dist/hermite.js b/dist/hermite.js
index 7a6cfe4..f0f3ccd 100644
--- a/dist/hermite.js
+++ b/dist/hermite.js
@@ -1,6 +1,6 @@
 //Hermite resize - fast image resize/resample using Hermite filter.
-//Version: 2.2
+//Version: 2.2.1
 //Author: ViliusL
 //https://github.com/viliusle/Hermite-resize
 //http://viliusle.github.io/miniPaint/
-function Hermite_class(){var a,c,b=[];this.init=function(){a=navigator.hardwareConcurrency||4}(),this.getCores=function(){return a},this.resample_auto=function(a,b,c,d,e){var f=this.getCores();window.Worker&&f>1?this.resample(a,b,c,d,e):(this.resample_single(a,b,c,!0),e())},this.resize_image=function(a,b,c,d,e){var f=document.getElementById(a),g=document.createElement("canvas");g.width=f.width,g.height=f.height;var h=g.getContext("2d");if(h.drawImage(f,0,0),void 0==b&&void 0==c&&void 0!=d&&(b=f.width/100*d,c=f.height/100*d),void 0==c){var i=f.width/b;c=f.height/i}b=Math.round(b),c=Math.round(c);var j=function(){var a=g.toDataURL();f.width=b,f.height=c,f.src=a,delete a,delete g};void 0==e||1==e?this.resample(g,b,c,!0,j):(this.resample_single(g,b,c,!0),j())},this.resample=function(d,e,f,g,h){var i=d.width,j=d.height;e=Math.round(e),f=Math.round(f);var k=j/f;if(b.length>0)for(var l=0;l<a;l++)void 0!=b[l]&&(b[l].terminate(),delete b[l]);b=new Array(a);for(var m=d.getContext("2d"),n=[],o=2*Math.ceil(j/a/2),p=-1,l=0;l<a;l++){var q=p+1;if(!(q>j)){p=q+o-1,p=Math.min(p,j-1);var r=o;r=Math.min(o,j-q),n[l]={},n[l].source=m.getImageData(0,q,i,o),n[l].target=!0,n[l].start_y=Math.ceil(q/k),n[l].height=r}}g===!0?(d.width=e,d.height=f):m.clearRect(0,0,i,j);for(var s=0,l=0;l<a;l++)if(void 0!=n[l].target){s++;var t=new Worker(c);b[l]=t,t.onmessage=function(a){s--;var c=a.data.core;delete b[c];var d=Math.ceil(n[c].height/k);n[c].target=m.createImageData(e,d),n[c].target.data.set(a.data.target),m.putImageData(n[c].target,0,n[c].start_y),s<=0&&h()};var u={width_source:i,height_source:n[l].height,width:e,height:Math.ceil(n[l].height/k),core:l,source:n[l].source.data.buffer};t.postMessage(u,[u.source])}},c=URL.createObjectURL(new Blob(["(",function(){onmessage=function(a){for(var b=a.data.core,c=a.data.width_source,d=a.data.height_source,e=a.data.width,f=a.data.height,g=c/e,h=d/f,i=Math.ceil(g/2),j=Math.ceil(h/2),k=new Uint8ClampedArray(a.data.source),m=(k.length/c/4,e*f*4),n=new ArrayBuffer(m),o=new Uint8ClampedArray(n,0,m),p=0;p<f;p++)for(var q=0;q<e;q++){var r=4*(q+p*e),s=0,t=0,u=0,v=0,w=0,x=0,y=0,z=p*h,A=Math.floor(q*g),B=Math.ceil((q+1)*g),C=Math.floor(p*h),D=Math.ceil((p+1)*h);B=Math.min(B,c),D=Math.min(D,d);for(var E=C;E<D;E++)for(var F=Math.abs(z-E)/j,G=q*g,H=F*F,I=A;I<B;I++){var J=Math.abs(G-I)/i,K=Math.sqrt(H+J*J);if(!(K>=1)){s=2*K*K*K-3*K*K+1;var L=4*(I+E*c);y+=s*k[L+3],u+=s,k[L+3]<255&&(s=s*k[L+3]/250),v+=s*k[L],w+=s*k[L+1],x+=s*k[L+2],t+=s}}o[r]=v/t,o[r+1]=w/t,o[r+2]=x/t,o[r+3]=y/u}var M={core:b,target:o};postMessage(M,[o.buffer])}}.toString(),")()"],{type:"application/javascript"})),this.resample_single=function(a,b,c,d){var e=a.width,f=a.height;b=Math.round(b),c=Math.round(c);for(var g=e/b,h=f/c,i=Math.ceil(g/2),j=Math.ceil(h/2),k=a.getContext("2d"),l=k.getImageData(0,0,e,f),m=k.createImageData(b,c),n=l.data,o=m.data,p=0;p<c;p++)for(var q=0;q<b;q++){var r=4*(q+p*b),s=0,t=0,u=0,v=0,w=0,x=0,y=0,z=p*h,A=Math.floor(q*g),B=Math.ceil((q+1)*g),C=Math.floor(p*h),D=Math.ceil((p+1)*h);B=Math.min(B,e),D=Math.min(D,f);for(var E=C;E<D;E++)for(var F=Math.abs(z-E)/j,G=q*g,H=F*F,I=A;I<B;I++){var J=Math.abs(G-I)/i,K=Math.sqrt(H+J*J);if(!(K>=1)){s=2*K*K*K-3*K*K+1;var L=4*(I+E*e);y+=s*n[L+3],u+=s,n[L+3]<255&&(s=s*n[L+3]/250),v+=s*n[L],w+=s*n[L+1],x+=s*n[L+2],t+=s}}o[r]=v/t,o[r+1]=w/t,o[r+2]=x/t,o[r+3]=y/u}d===!0?(a.width=b,a.height=c):k.clearRect(0,0,e,f),k.putImageData(m,0,0)}}
\ No newline at end of file
+function Hermite_class(){var t,a,e=[];this.init=void(t=navigator.hardwareConcurrency||4),this.getCores=function(){return t},this.resample_auto=function(t,a,e,r,i){var h=this.getCores();window.Worker&&h>1?this.resample(t,a,e,r,i):(this.resample_single(t,a,e,!0),void 0!=i&&i())},this.resize_image=function(t,a,e,r,i){var h=document.getElementById(t),o=document.createElement("canvas");if(o.width=h.width,o.height=h.height,o.getContext("2d").drawImage(h,0,0),void 0==a&&void 0==e&&void 0!=r&&(a=h.width/100*r,e=h.height/100*r),void 0==e){var n=h.width/a;e=h.height/n}a=Math.round(a),e=Math.round(e);var s=function(){var t=o.toDataURL();h.width=a,h.height=e,h.src=t,delete t,delete o};void 0==i||1==i?this.resample(o,a,e,!0,s):(this.resample_single(o,a,e,!0),s())},this.resample=function(r,i,h,o,n){var s=r.width,d=r.height;i=Math.round(i);var c=d/(h=Math.round(h));if(e.length>0)for(M=0;M<t;M++)void 0!=e[M]&&(e[M].terminate(),delete e[M]);e=new Array(t);for(var g=r.getContext("2d"),v=[],l=2*Math.ceil(d/t/2),f=-1,M=0;M<t;M++){var u=f+1;if(!(u>d)){f=u+l-1,f=Math.min(f,d-1);var m=l;m=Math.min(l,d-u),v[M]={},v[M].source=g.getImageData(0,u,s,l),v[M].target=!0,v[M].start_y=Math.ceil(u/c),v[M].height=m}}!0===o?(r.width=i,r.height=h):g.clearRect(0,0,s,d);for(var w=0,M=0;M<t;M++)if(void 0!=v[M].target){w++;var p=new Worker(a);e[M]=p,p.onmessage=function(t){w--;var a=t.data.core;delete e[a];var r=Math.ceil(v[a].height/c);v[a].target=g.createImageData(i,r),v[a].target.data.set(t.data.target),g.putImageData(v[a].target,0,v[a].start_y),w<=0&&void 0!=n&&n()};var _={width_source:s,height_source:v[M].height,width:i,height:Math.ceil(v[M].height/c),core:M,source:v[M].source.data.buffer};p.postMessage(_,[_.source])}},a=URL.createObjectURL(new Blob(["(",function(){onmessage=function(t){for(var a=t.data.core,e=t.data.width_source,r=t.data.height_source,i=t.data.width,h=t.data.height,o=e/i,n=r/h,s=Math.ceil(o/2),d=Math.ceil(n/2),c=new Uint8ClampedArray(t.data.source),g=(c.length,i*h*4),v=new ArrayBuffer(g),l=new Uint8ClampedArray(v,0,g),f=0;f<h;f++)for(var M=0;M<i;M++){var u=4*(M+f*i),m=0,w=0,p=0,_=0,y=0,b=0,C=0,I=f*n,D=Math.floor(M*o),R=Math.ceil((M+1)*o),U=Math.floor(f*n),A=Math.ceil((f+1)*n);R=Math.min(R,e),A=Math.min(A,r);for(var x=U;x<A;x++)for(var B=Math.abs(I-x)/d,L=M*o,j=B*B,k=D;k<R;k++){var q=Math.abs(L-k)/s,E=Math.sqrt(j+q*q);if(!(E>=1)){var W=4*(k+x*e);C+=(m=2*E*E*E-3*E*E+1)*c[W+3],p+=m,c[W+3]<255&&(m=m*c[W+3]/250),_+=m*c[W],y+=m*c[W+1],b+=m*c[W+2],w+=m}}l[u]=_/w,l[u+1]=y/w,l[u+2]=b/w,l[u+3]=C/p}var z={core:a,target:l};postMessage(z,[l.buffer])}}.toString(),")()"],{type:"application/javascript"})),this.resample_single=function(t,a,e,r){for(var i=t.width,h=t.height,o=i/(a=Math.round(a)),n=h/(e=Math.round(e)),s=Math.ceil(o/2),d=Math.ceil(n/2),c=t.getContext("2d"),g=c.getImageData(0,0,i,h),v=c.createImageData(a,e),l=g.data,f=v.data,M=0;M<e;M++)for(var u=0;u<a;u++){var m=4*(u+M*a),w=0,p=0,_=0,y=0,b=0,C=0,I=0,D=M*n,R=Math.floor(u*o),U=Math.ceil((u+1)*o),A=Math.floor(M*n),x=Math.ceil((M+1)*n);U=Math.min(U,i),x=Math.min(x,h);for(var B=A;B<x;B++)for(var L=Math.abs(D-B)/d,j=u*o,k=L*L,q=R;q<U;q++){var E=Math.abs(j-q)/s,W=Math.sqrt(k+E*E);if(!(W>=1)){var z=4*(q+B*i);I+=(w=2*W*W*W-3*W*W+1)*l[z+3],_+=w,l[z+3]<255&&(w=w*l[z+3]/250),y+=w*l[z],b+=w*l[z+1],C+=w*l[z+2],p+=w}}f[m]=y/p,f[m+1]=b/p,f[m+2]=C/p,f[m+3]=I/_}!0===r?(t.width=a,t.height=e):c.clearRect(0,0,i,h),c.putImageData(v,0,0)}}
diff --git a/src/hermite.js b/src/hermite.js
index 3340eb9..85feeed 100644
--- a/src/hermite.js
+++ b/src/hermite.js
@@ -1,6 +1,6 @@
 /*
  * Hermite resize - fast image resize/resample using Hermite filter.
- * Version: 2.2
+ * Version: 2.2.1
  * Author: ViliusL
  * demo: http://viliusle.github.io/miniPaint/
  */
@@ -43,7 +43,9 @@ function Hermite_class() {
 		} else {
 			//1 cpu version
 			this.resample_single(canvas, width, height, true);
-			on_finish();
+			if(on_finish != undefined) {
+				on_finish();
+			}
 		}
 	};
 	
@@ -188,7 +190,9 @@ function Hermite_class() {
 				
 				if (workers_in_use <= 0) {
 					//finish
-					on_finish();
+					if(on_finish != undefined) {
+						on_finish();
+					}
 				}
 			};
 			var objData = {