/* CCGallery - HTML5 Multimedia Gallery - 1.4
 * Copyright 2011, Nilok Bose  
 * http://codecanyon.net/user/cosmocoder
*/

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/*
 * Projective texturing using Canvas.
 * (c) Steven Wittens 2008
 * http://www.acko.net/
 */
 
/*
 * Modified by Nilok Bose, (c) 2011   
 * http://codecanyon.net/user/cosmocoder
 */
 
function mapTexture(j,i,e){var h=3,g=28,b=getProjectiveTransform(i);var d=b.transformProjectiveVector([0,0,1]),a=b.transformProjectiveVector([1,0,1]),f=b.transformProjectiveVector([0,1,1]),c=b.transformProjectiveVector([1,1,1]);j.save();j.beginPath();j.moveTo(d[0],d[1]);j.lineTo(a[0],a[1]);j.lineTo(c[0],c[1]);j.lineTo(f[0],f[1]);j.closePath();j.clip();divide(0,0,1,1,d,a,f,c,b,h,g,j,e);j.restore()}function divide(o,W,m,V,U,T,S,Q,x,u,l,s,h){var C=Math.abs,B=Math.max,g=Math.min,q=Math.sqrt;if(u){var M=[T[0]+S[0]-2*U[0],T[1]+S[1]-2*U[1]],K=[T[0]+S[0]-2*Q[0],T[1]+S[1]-2*Q[1]],I=[M[0]+K[0],M[1]+K[1]],E=C((I[0]*I[0]+I[1]*I[1])/(M[0]*K[0]+M[1]*K[1]));M=[T[0]-U[0]+Q[0]-S[0],T[1]-U[1]+Q[1]-S[1]];K=[S[0]-U[0]+Q[0]-T[0],S[1]-U[1]+Q[1]-T[1]];var A=C(M[0]*K[1]-M[1]*K[0]);if((o===0&&m===1)||((0.25+E*5)*A>(l*l))){var c=(o+m)/2,w=(W+V)/2,a=x.transformProjectiveVector([c,w,1]),i=x.transformProjectiveVector([c,W,1]),t=x.transformProjectiveVector([c,V,1]),p=x.transformProjectiveVector([o,w,1]),j=x.transformProjectiveVector([m,w,1]);--u;divide(o,W,c,w,U,i,p,a,x,u,l,s,h);divide(c,W,m,w,i,T,a,j,x,u,l,s,h);divide(o,w,c,V,p,a,S,t,x,u,l,s,h);divide(c,w,m,V,a,j,t,Q,x,u,l,s,h);return}}s.save();s.beginPath();s.moveTo(U[0],U[1]);s.lineTo(T[0],T[1]);s.lineTo(Q[0],Q[1]);s.lineTo(S[0],S[1]);s.closePath();var P=[T[0]-U[0],T[1]-U[1]],y=[Q[0]-T[0],Q[1]-T[1]],R=[S[0]-Q[0],S[1]-Q[1]],k=[U[0]-S[0],U[1]-S[1]];var H=C(P[0]*k[1]-P[1]*k[0]),G=C(y[0]*P[1]-y[1]*P[0]),D=C(R[0]*y[1]-R[1]*y[0]),F=C(k[0]*R[1]-k[1]*R[0]),n=B(B(H,G),B(F,D)),d=0,b=0,L=0,J=0;switch(n){case H:s.transform(P[0],P[1],-k[0],-k[1],U[0],U[1]);if(m!==1){L=1.05/q(P[0]*P[0]+P[1]*P[1])}if(V!==1){J=1.05/q(k[0]*k[0]+k[1]*k[1])}break;case G:s.transform(P[0],P[1],y[0],y[1],T[0],T[1]);if(m!==1){L=1.05/q(P[0]*P[0]+P[1]*P[1])}if(V!==1){J=1.05/q(y[0]*y[0]+y[1]*y[1])}d=-1;break;case D:s.transform(-R[0],-R[1],y[0],y[1],Q[0],Q[1]);if(m!==1){L=1.05/q(R[0]*R[0]+R[1]*R[1])}if(V!==1){J=1.05/q(y[0]*y[0]+y[1]*y[1])}d=-1;b=-1;break;case F:s.transform(-R[0],-R[1],-k[0],-k[1],S[0],S[1]);if(m!==1){L=1.05/q(R[0]*R[0]+R[1]*R[1])}if(V!==1){J=1.05/q(k[0]*k[0]+k[1]*k[1])}b=-1;break}var f=(m-o),e=(V-W),O=L*f,N=J*e;var v=h.width,z=h.height;s.drawImage(h,o*v,W*z,g(m-o+O,1)*v,g(V-W+N,1)*z,d,b,1+L,1+J);s.restore()}function getProjectiveTransform(b){var c=new Matrix(9,8,[[1,1,1,0,0,0,-b[3].x,-b[3].x,-b[3].x],[0,1,1,0,0,0,0,-b[2].x,-b[2].x],[1,0,1,0,0,0,-b[1].x,0,-b[1].x],[0,0,1,0,0,0,0,0,-b[0].x],[0,0,0,-1,-1,-1,b[3].y,b[3].y,b[3].y],[0,0,0,0,-1,-1,0,b[2].y,b[2].y],[0,0,0,-1,0,-1,b[1].y,0,b[1].y],[0,0,0,0,0,-1,0,0,b[0].y]]);var d=c.rowEchelon().values;var a=new Matrix(3,3,[[-d[0][8],-d[1][8],-d[2][8]],[-d[3][8],-d[4][8],-d[5][8]],[-d[6][8],-d[7][8],1]]);return a};


/* 
 * Generic matrix class.
 * (c) Steven Wittens 2008
 * http://www.acko.net/
 */
 
/*
 * Modified by Nilok Bose, (c) 2011  
 * http://codecanyon.net/user/cosmocoder
 */
 
var Matrix=function(a,c,b){this.w=a;this.h=c;this.values=b||Matrix.allocate(c)};Matrix.allocate=function(a,e){var b=[],d=e,c=a;while(d--){b[d]=[];while(c--){b[d][c]=0}}return b};Matrix.cloneValues=function(b){clone=[];for(var c=0,a=b.length;c<a;++c){clone[c]=[].concat(b[c])}return clone};Matrix.prototype.transformProjectiveVector=function(b){var c=[];for(var e=0;e<this.h;++e){c[e]=0;for(var a=0;a<this.w;++a){c[e]+=this.values[e][a]*b[a]}}var d=1/(c[c.length-1]);for(var e=0;e<this.h;++e){c[e]*=d}return c};Matrix.prototype.rowEchelon=function(){if(this.w<=this.h){throw"Matrix rowEchelon size mismatch"}var h=Matrix.cloneValues(this.values);for(var a=0;a<this.h;++a){var f=h[a][a];while(f==0){for(var g=a+1;g<this.h;++g){if(h[g][a]!=0){var i=h[g];h[g]=h[a];h[a]=i;break}}if(g==this.h){return new Matrix(this.w,this.h,h)}else{f=h[a][a]}}var b=1/f;for(var e=a;e<this.w;++e){h[a][e]*=b}for(var d=0;d<this.h;++d){if(d==a){continue}var c=h[d][a];h[d][a]=0;for(var e=a+1;e<this.w;++e){h[d][e]-=c*h[a][e]}}}return new Matrix(this.w,this.h,h)};