@acamposuribe/brush/dist/brush.js

Unlock custom brushes, natural fill effects and intuitive hatching in vanilla js

var t,e;t=this,e=function(t){const e=Math.sqrt(3),i=.5*(e-1),r=(3-e)/6,n=t=>0|Math.floor(t),o=new Float64Array([1,1,-1,1,1,-1,-1,-1,1,0,-1,0,1,0,-1,0,0,1,0,-1,0,1,0,-1]);function s(t=Math.random){const e=function(t){const e=new Uint8Array(512);for(let t=0;t<256;t++)e[t]=t;for(let i=0;i<255;i++){const r=i+~~(t()*(256-i)),n=e[i];e[i]=e[r],e[r]=n}for(let t=256;t<512;t++)e[t]=e[t-256];return e}(t),s=new Float64Array(e).map((t=>o[t%12*2])),a=new Float64Array(e).map((t=>o[t%12*2+1]));return function(t,o){let c=0,l=0,h=0;const u=(t+o)*i,f=n(t+u),g=n(o+u),m=(f+g)*r,x=t-(f-m),d=o-(g-m);let p,y;x>d?(p=1,y=0):(p=0,y=1);const v=x-p+r,_=d-y+r,b=x-1+2*r,E=d-1+2*r,w=255&f,R=255&g;let A=.5-x*x-d*d;if(A>=0){const t=w+e[R];A*=A,c=A*A*(s[t]*x+a[t]*d)}let S=.5-v*v-_*_;if(S>=0){const t=w+p+e[R+y];S*=S,l=S*S*(s[t]*v+a[t]*_)}let P=.5-b*b-E*E;if(P>=0){const t=w+1+e[R+1];P*=P,h=P*P*(s[t]*b+a[t]*E)}return 70*(c+l+h)}}function a(t,e){let i=new c(t),r=()=>i.next();return r.double=()=>r()+11102230246251565e-32*(2097152*r()|0),r.int32=()=>4294967296*i.next()|0,r.quick=r,r}class c{constructor(t){null==t&&(t=+new Date);let e=4022871197;function i(t){t=String(t);for(let i=0;i<t.length;i++){e+=t.charCodeAt(i);let r=.02519603282416938*e;e=r>>>0,r-=e,r*=e,e=r>>>0,r-=e,e+=4294967296*r}return 2.3283064365386963e-10*(e>>>0)}this.c=1,this.s0=i(" "),this.s1=i(" "),this.s2=i(" "),this.s0-=i(t),this.s0<0&&(this.s0+=1),this.s1-=i(t),this.s1<0&&(this.s1+=1),this.s2-=i(t),this.s2<0&&(this.s2+=1)}next(){let{c:t,s0:e,s1:i,s2:r}=this,n=2091639*e+2.3283064365386963e-10*t;return this.s0=i,this.s1=r,this.s2=n-(this.c=0|n)}copy(t,e){return e.c=t.c,e.s0=t.s0,e.s1=t.s1,e.s2=t.s2,e}}let l=a(Math.random());t.noise=s(a(Math.random()));const h=(t=0,e=1)=>t+l()*(e-t),u=t=>t[~~(l()*t.length)],f=(t,e)=>~~h(t,e),g=(t=0,e=1)=>{const i=1-l(),r=l();return Math.sqrt(-2*Math.log(i))*E(360*r)*e+t},m=t=>{let e=0;const i=[];for(const r in t)e+=t[r],i.push({key:r,cumulative:e});const r=l()*e;for(const{key:t,cumulative:e}of i)if(r<e)return isNaN(t)?t:parseInt(t)},x=(t,e,i,r,n,o=!1)=>{let s=r+(t-e)/(i-e)*(n-r);return o?r<n?d(s,r,n):d(s,n,r):s},d=(t,e,i)=>Math.max(Math.min(t,i),e),p=t=>(t%=360)<0?t+360:t,y=1440,v=2*Math.PI/y,_=new Float32Array(y).fill(NaN),b=new Float32Array(y).fill(NaN),E=t=>{const e=~~(4*p(t));let i=_[e];return isNaN(i)&&(i=Math.cos(e*v),_[e]=i),i},w=t=>{const e=~~(4*p(t));let i=b[e];return isNaN(i)&&(i=Math.sin(e*v),b[e]=i),i},R=t=>{let e=180*t/Math.PI%360;return e<0?e+360:e},A=(t,e,i,r,n)=>{let o=E(n),s=w(n);return{x:o*(i-t)+s*(r-e)+t,y:o*(r-e)-s*(i-t)+e}},S=(t,e,i,r)=>Math.hypot(i-t,r-e),P=(t,e,i,r)=>R(Math.atan2(-(r-e),i-t)),I=(t,e,i,r,n=!1)=>{let o=t.x,s=t.y,a=e.x,c=e.y,l=i.x,h=i.y,u=r.x,f=r.y;if(o===a&&s===c||l===u&&h===f)return!1;let g=a-o,m=c-s,x=u-l,d=f-h,p=d*g-x*m;if(0===p)return!1;let y=(x*(s-h)-d*(o-l))/p,v=(g*(s-h)-m*(o-l))/p;return!(!n&&(v<0||v>1))&&{x:o+y*g,y:s+y*m}},T=()=>{let t,e,i={};function r(){const i=e.createTexture();return e.bindTexture(e.TEXTURE_2D,i),e.texStorage2D(e.TEXTURE_2D,1,e.RGBA8,t.width,t.height),e.texParameteri(e.TEXTURE_2D,e.TEXTURE_MIN_FILTER,e.LINEAR),e.texParameteri(e.TEXTURE_2D,e.TEXTURE_MAG_FILTER,e.LINEAR),i}function n(){let t=r();const i=e.createFramebuffer();return e.bindFramebuffer(e.FRAMEBUFFER,i),e.framebufferTexture2D(e.FRAMEBUFFER,e.COLOR_ATTACHMENT0,e.TEXTURE_2D,t,0),{texture:t,fbo:i}}function o(t,i){e.activeTexture(t),e.bindTexture(e.TEXTURE_2D,i)}function s(i,r){e.bindFramebuffer(e.READ_FRAMEBUFFER,i),e.bindFramebuffer(e.DRAW_FRAMEBUFFER,r),e.blitFramebuffer(0,0,t.width,t.height,0,0,t.width,t.height,e.COLOR_BUFFER_BIT,e.NEAREST)}function a(t){e.bindFramebuffer(e.DRAW_FRAMEBUFFER,i.source.fbo),e.clearColor(...t),e.clear(e.COLOR_BUFFER_BIT|e.DEPTH_BUFFER_BIT)}onmessage=async c=>{const l=c.data;l.canvas?function(s){t=s,e=t.getContext("webgl2",{antialias:!1});const c=(t=>{const e=t.createProgram();for(let[i,r]of[[t.VERTEX_SHADER,"#version 300 es\n#define GLSLIFY 1\nout vec2 p;void main(){vec3 v=vec3(-1);v[gl_VertexID]=3.;gl_Position=vec4(p=v.xy,0,1);}"],[t.FRAGMENT_SHADER,"#version 300 es\nprecision highp float;\n#define GLSLIFY 1\nuniform vec4 u_addColor;uniform bool u_isErase;uniform bool u_isImage;uniform bool u_isBrush;uniform sampler2D u_source;uniform sampler2D u_mask;in vec2 p;out vec4 outColor;const int SPECTRAL_SIZE=38;const float SPECTRAL_GAMMA=2.4;const float SPECTRAL_EPSILON=0.0001;float compand(float x,bool inverse){if(inverse){return(x<0.04045)? x/12.92 : pow((x+0.055)/1.055,SPECTRAL_GAMMA);}else{return(x<0.0031308)? x*12.92 : 1.055*pow(x,1.0/SPECTRAL_GAMMA)-0.055;}}vec3 spectral_srgb_to_linear(vec3 srgb){return vec3(compand(srgb.r,true),compand(srgb.g,true),compand(srgb.b,true));}vec3 spectral_linear_to_srgb(vec3 lrgb){return clamp(vec3(compand(lrgb.r,false),compand(lrgb.g,false),compand(lrgb.b,false)),0.0,1.0);}void spectral_upsampling(vec3 lrgb,out float w,out float c,out float m,out float y,out float r,out float g,out float b){w=min(lrgb.r,min(lrgb.g,lrgb.b));lrgb-=w;c=min(lrgb.g,lrgb.b);m=min(lrgb.r,lrgb.b);y=min(lrgb.r,lrgb.g);r=min(max(0.,lrgb.r-lrgb.b),max(0.,lrgb.r-lrgb.g));g=min(max(0.,lrgb.g-lrgb.b),max(0.,lrgb.g-lrgb.r));b=min(max(0.,lrgb.b-lrgb.g),max(0.,lrgb.b-lrgb.r));}void spectral_linear_to_reflectance(vec3 lrgb,inout float R[SPECTRAL_SIZE]){float w,c,m,y,r,g,b;spectral_upsampling(lrgb,w,c,m,y,r,g,b);R[0]=max(SPECTRAL_EPSILON,w+c*0.96853629+m*0.51567122+y*0.02055257+r*0.03147571+g*0.49108579+b*0.97901834);R[1]=max(SPECTRAL_EPSILON,w+c*0.96855103+m*0.54015520+y*0.02059936+r*0.03146636+g*0.46944057+b*0.97901649);R[2]=max(SPECTRAL_EPSILON,w+c*0.96859338+m*0.62645502+y*0.02062723+r*0.03140624+g*0.40165780+b*0.97901118);R[3]=max(SPECTRAL_EPSILON,w+c*0.96877345+m*0.75595012+y*0.02073387+r*0.03119611+g*0.24490420+b*0.97892146);R[4]=max(SPECTRAL_EPSILON,w+c*0.96942204+m*0.92826996+y*0.02114202+r*0.03053888+g*0.06826880+b*0.97858555);R[5]=max(SPECTRAL_EPSILON,w+c*0.97143709+m*0.97223624+y*0.02233154+r*0.02856855+g*0.02732883+b*0.97743705);R[6]=max(SPECTRAL_EPSILON,w+c*0.97541862+m*0.98616174+y*0.02556857+r*0.02459485+g*0.01360600+b*0.97428075);R[7]=max(SPECTRAL_EPSILON,w+c*0.98074186+m*0.98955255+y*0.03330189+r*0.01929520+g*0.01000187+b*0.96663223);R[8]=max(SPECTRAL_EPSILON,w+c*0.98580992+m*0.98676237+y*0.05185294+r*0.01423112+g*0.01284127+b*0.94822893);R[9]=max(SPECTRAL_EPSILON,w+c*0.98971194+m*0.97312575+y*0.10087639+r*0.01033111+g*0.02636635+b*0.89937713);R[10]=max(SPECTRAL_EPSILON,w+c*0.99238027+m*0.91944277+y*0.24000413+r*0.00765876+g*0.07058713+b*0.76070164);R[11]=max(SPECTRAL_EPSILON,w+c*0.99409844+m*0.32564851+y*0.53589066+r*0.00593693+g*0.70421692+b*0.46420440);R[12]=max(SPECTRAL_EPSILON,w+c*0.99517200+m*0.13820628+y*0.79874659+r*0.00485616+g*0.85473994+b*0.20123039);R[13]=max(SPECTRAL_EPSILON,w+c*0.99576545+m*0.05015143+y*0.91186529+r*0.00426186+g*0.95081565+b*0.08808402);R[14]=max(SPECTRAL_EPSILON,w+c*0.99593552+m*0.02912336+y*0.95399623+r*0.00409039+g*0.97170370+b*0.04592894);R[15]=max(SPECTRAL_EPSILON,w+c*0.99564041+m*0.02421691+y*0.97137099+r*0.00438375+g*0.97651888+b*0.02860373);R[16]=max(SPECTRAL_EPSILON,w+c*0.99464769+m*0.02660696+y*0.97939505+r*0.00537525+g*0.97429245+b*0.02060067);R[17]=max(SPECTRAL_EPSILON,w+c*0.99229579+m*0.03407586+y*0.98345207+r*0.00772962+g*0.97012917+b*0.01656701);R[18]=max(SPECTRAL_EPSILON,w+c*0.98638762+m*0.04835936+y*0.98553736+r*0.01366120+g*0.94258630+b*0.01451549);R[19]=max(SPECTRAL_EPSILON,w+c*0.96829712+m*0.00011720+y*0.98648905+r*0.03181352+g*0.99989207+b*0.01357964);R[20]=max(SPECTRAL_EPSILON,w+c*0.89228016+m*0.00008554+y*0.98674535+r*0.10791525+g*0.99989891+b*0.01331243);R[21]=max(SPECTRAL_EPSILON,w+c*0.53740239+m*0.85267882+y*0.98657555+r*0.46249516+g*0.13823139+b*0.01347661);R[22]=max(SPECTRAL_EPSILON,w+c*0.15360445+m*0.93188793+y*0.98611877+r*0.84604333+g*0.06968113+b*0.01387181);R[23]=max(SPECTRAL_EPSILON,w+c*0.05705719+m*0.94810268+y*0.98559942+r*0.94275572+g*0.05628787+b*0.01435472);R[24]=max(SPECTRAL_EPSILON,w+c*0.03126539+m*0.94200977+y*0.98507063+r*0.96860996+g*0.06111561+b*0.01479836);R[25]=max(SPECTRAL_EPSILON,w+c*0.02205445+m*0.91478045+y*0.98460039+r*0.97783966+g*0.08987709+b*0.01515250);R[26]=max(SPECTRAL_EPSILON,w+c*0.01802271+m*0.87065445+y*0.98425301+r*0.98187757+g*0.13656016+b*0.01540513);R[27]=max(SPECTRAL_EPSILON,w+c*0.01613460+m*0.78827548+y*0.98403909+r*0.98377315+g*0.22169624+b*0.01557233);R[28]=max(SPECTRAL_EPSILON,w+c*0.01520947+m*0.65738359+y*0.98388535+r*0.98470202+g*0.32176956+b*0.01565710);R[29]=max(SPECTRAL_EPSILON,w+c*0.01475977+m*0.59909403+y*0.98376116+r*0.98515481+g*0.36157329+b*0.01571025);R[30]=max(SPECTRAL_EPSILON,w+c*0.01454263+m*0.56817268+y*0.98368246+r*0.98537114+g*0.48361920+b*0.01571916);R[31]=max(SPECTRAL_EPSILON,w+c*0.01444459+m*0.54031997+y*0.98365023+r*0.98546685+g*0.46488579+b*0.01572133);R[32]=max(SPECTRAL_EPSILON,w+c*0.01439897+m*0.52110241+y*0.98361309+r*0.98550011+g*0.47440306+b*0.01572502);R[33]=max(SPECTRAL_EPSILON,w+c*0.01437620+m*0.51041094+y*0.98357259+r*0.98551031+g*0.48576990+b*0.01571717);R[34]=max(SPECTRAL_EPSILON,w+c*0.01436343+m*0.50526577+y*0.98353856+r*0.98550741+g*0.49267971+b*0.01571905);R[35]=max(SPECTRAL_EPSILON,w+c*0.01435687+m*0.50255080+y*0.98351247+r*0.98551323+g*0.49625685+b*0.01571059);R[36]=max(SPECTRAL_EPSILON,w+c*0.01435370+m*0.50126452+y*0.98350101+r*0.98551563+g*0.49807754+b*0.01569728);R[37]=max(SPECTRAL_EPSILON,w+c*0.01435408+m*0.50083021+y*0.98350852+r*0.98551547+g*0.49889859+b*0.01570020);}const vec3 XYZ_DATA[SPECTRAL_SIZE]=vec3[](vec3(0.00006469,0.00000184,0.00030502),vec3(0.00021941,0.00000621,0.00103681),vec3(0.00112057,0.00003101,0.00531314),vec3(0.00376661,0.00010475,0.01795439),vec3(0.01188055,0.00035364,0.05707758),vec3(0.02328644,0.00095147,0.11365162),vec3(0.03455942,0.00228226,0.17335873),vec3(0.03722379,0.00420733,0.19620658),vec3(0.03241838,0.00668880,0.18608237),vec3(0.02123321,0.00988840,0.13995048),vec3(0.01049099,0.01524945,0.08917453),vec3(0.00329584,0.02141831,0.04789621),vec3(0.00050704,0.03342293,0.02814563),vec3(0.00094867,0.05131001,0.01613766),vec3(0.00627372,0.07040208,0.00775910),vec3(0.01686462,0.08783871,0.00429615),vec3(0.02868965,0.09424905,0.00200551),vec3(0.04267481,0.09795667,0.00086147),vec3(0.05625475,0.09415219,0.00036904),vec3(0.06947040,0.08678102,0.00019143),vec3(0.08305315,0.07885653,0.00014956),vec3(0.08612610,0.06352670,0.00009231),vec3(0.09046614,0.05374142,0.00006813),vec3(0.08500387,0.04264606,0.00002883),vec3(0.07090667,0.03161735,0.00001577),vec3(0.05062889,0.02088521,0.00000394),vec3(0.03547396,0.01386011,0.00000158),vec3(0.02146821,0.00810264,0.00000000),vec3(0.01251646,0.00463010,0.00000000),vec3(0.00680458,0.00249138,0.00000000),vec3(0.00346457,0.00125930,0.00000000),vec3(0.00149761,0.00054165,0.00000000),vec3(0.00076970,0.00027795,0.00000000),vec3(0.00040737,0.00014711,0.00000000),vec3(0.00016901,0.00006103,0.00000000),vec3(0.00009522,0.00003439,0.00000000),vec3(0.00004903,0.00001771,0.00000000),vec3(0.00002000,0.00000722,0.00000000));vec3 spectral_reflectance_to_xyz(float R[SPECTRAL_SIZE]){vec3 xyz=vec3(0.0);for(int i=0;i<SPECTRAL_SIZE;i++){xyz+=R[i]*XYZ_DATA[i];}return xyz;}float calculate_ks(float r){return pow(1.0-r,2.0)/(2.0*r);}const mat3 XYZ_RGB=mat3(vec3(3.24306333,-1.53837619,-0.49893282),vec3(-0.96896309,1.87542451,0.04154303),vec3(0.05568392,-0.20417438,1.05799454));vec3 spectral_xyz_to_srgb(vec3 xyz){vec3 lrgb=vec3(dot(XYZ_RGB[0],xyz),dot(XYZ_RGB[1],xyz),dot(XYZ_RGB[2],xyz));return spectral_linear_to_srgb(lrgb);}vec3 srgb_to_xyz(vec3 color){vec3 lrgb=spectral_srgb_to_linear(color);float R[SPECTRAL_SIZE];spectral_linear_to_reflectance(lrgb,R);return spectral_reflectance_to_xyz(R);}vec3 spectral_mix(vec3 color1,vec3 color2,float t){vec3 lrgb1=spectral_srgb_to_linear(color1);vec3 lrgb2=spectral_srgb_to_linear(color2);float R1[SPECTRAL_SIZE];float R2[SPECTRAL_SIZE];float R[SPECTRAL_SIZE];spectral_linear_to_reflectance(lrgb1,R1);spectral_linear_to_reflectance(lrgb2,R2);float l1=spectral_reflectance_to_xyz(R1)[1];float l2=spectral_reflectance_to_xyz(R2)[1];float t1=l1*pow(1.0-t,2.0);float t2=l2*pow(t,2.0);t=t2/(t1+t2);for(int i=0;i<SPECTRAL_SIZE;i++){float ks1=calculate_ks(R1[i]);float ks2=calculate_ks(R2[i]);float ks=(1.0-t)*ks1+t*ks2;R[i]=1.0+ks-sqrt(ks*ks+2.0*ks);}return spectral_xyz_to_srgb(spectral_reflectance_to_xyz(R));}const float GAMMA=2.4,EPSILON=0.0001;const float DARKEN_THRESHOLD=0.7;const float EDGE_MIN=0.05,EDGE_MAX=0.35;void main(void){vec2 uv=0.5*p+0.5;vec2 uv1=vec2(uv.x,1.0-uv.y);vec4 source=texture(u_source,uv);vec4 maskColor=texture(u_mask,uv1);if(u_isImage){outColor=maskColor;return;}if(maskColor.r<=0.0){outColor=source;return;}vec4 pigment=vec4(u_addColor.xyz,1.0);if(maskColor.a>DARKEN_THRESHOLD&&!u_isErase){float blacken=0.5*(maskColor.a-DARKEN_THRESHOLD);pigment=pigment*(1.0-blacken)-vec4(0.5)*blacken;}float mixIntensity=maskColor.a;if(!u_isBrush){vec2 texelSize=1.0/vec2(textureSize(u_mask,0));float scaledAlpha=maskColor.a*15.0;float blurEdge=0.0;for(int i=-2;i<=2;i+=2){for(int j=-2;j<=2;j+=2){vec2 sampleUV=uv1+vec2(float(i),float(j))*texelSize;float neighborAlpha=texture(u_mask,sampleUV).a*15.0;blurEdge+=smoothstep(EDGE_MIN,EDGE_MAX,length(vec2(dFdx(neighborAlpha),dFdy(neighborAlpha))));}}blurEdge/=9.0;mixIntensity=clamp(maskColor.a+blurEdge*0.1,0.0,1.0);}outColor=vec4(spectral_mix(source.rgb,pigment.rgb,mixIntensity),1.0);}"]]){const n=t.createShader(i);t.shaderSource(n,r),t.compileShader(n),t.attachShader(e,n)}return t.linkProgram(e),e})(e);e.useProgram(c),["u_addColor","u_isErase","u_isImage","u_isBrush","u_source","u_mask"].forEach((t=>{i[t]=e.getUniformLocation(c,t)})),i.mask=r(),i.source=n(),i.target=n(),e.uniform1i(i.u_source,0),e.uniform1i(i.u_mask,1),o(e.TEXTURE0,i.source.texture),o(e.TEXTURE1,i.mask),a([1,1,1,0])}(l.canvas):l.isBG?a(l.color):l.mask&&function(t){(function(t){let i=t.mask;if(self.navigator&&/Safari/.test(self.navigator.userAgent)&&!/Chrome/.test(self.navigator.userAgent)){const t=new 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X{constructor(t,e,i){if(isNaN(t)){this.hex=this.standardize(t);let e=this.hexToRgb(this.hex);this.r=e.r,this.g=e.g,this.b=e.b}else this.r=d(t,0,255),this.g=d(e||t,0,255),this.b=d(i||t,0,255),this.hex=this.rgbToHex(this.r,this.g,this.b);this.gl=[this.r/255,this.g/255,this.b/255,1]}rgbToHex=(t,e,i)=>"#"+(1<<24|t<<16|e<<8|i).toString(16).slice(1);hexToRgb(t){t=t.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i,((t,e,i,r)=>e+e+i+i+r+r));const e=/^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(t);return e?{r:parseInt(e[1],16),g:parseInt(e[2],16),b:parseInt(e[3],16)}:null}standardize=t=>(B.fillStyle=t,B.fillStyle)}const D=()=>{z.loaded||((()=>{if(!O)throw new Error("Call `load()` first")})(),z.load())},z={loaded:!1,isBlending:!1,load(){const t=L[C];t.worker||(t.mask=new OffscreenCanvas(k,M),t.glMask=new 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Wt(t,e){e.type=["marker","custom","image","spray"].includes(e.type)?e.type:"default",Ut.set(t,{param:e,colors:[],buffers:[]})}function Ht(t){Ut.has(t)&&(F.stroke.type=t)}function Zt(t,e,i){F.stroke.color=new X(...arguments),F.stroke.isActive=!0}function Vt(t){F.stroke.weight=t}function jt(t,e,i=1){Ht(t),Zt(e),Vt(i)}const qt={};function $t(t,e,i,r=!1){Bt=new H(t,e),Xt=i,Dt=r,Dt&&Dt.calcIndex(0)}const Kt=[];function Jt(t,e){e||(zt=t),function(){qt.seed=99999*h();const{param:t}=Ut.get(F.stroke.type)??{};if(!t)return;qt.p=t;const{pressure:e}=t;qt.a="custom"!==e.type?h(-1,1):0,qt.b="custom"!==e.type?h(1,1.5):0,qt.cp="custom"!==e.type?h(3,3.5):h(-.2,.2),[qt.min,qt.max]=e.min_max,Mt(),ne()&&z.blend(F.stroke.color),z.isBrush=!0,qt.alpha=re(),se()}();const i=function(){const{param:t}=Ut.get(F.stroke.type)??{};return t?t.spacing:1}(),r=Math.round(Xt*(e?t:1)/i);for(let n=0;n<r;n++)Kt.length<2*r&&Kt.push(g()),Qt(),e?Bt.plotTo(Dt,i,i,t,n<10):Bt.moveTo(t,i,i);Ot(F.stroke.color),se()}function 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