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Resemble.js
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Merge pull request #89 from flowtsohg/master 

Less heap allocations
pull/96/head
James Cryer 8 years ago committed by GitHub
parent
16357ecb0b c9884357c9
commit
a7bf6226a8
1 changed files with 42 additions and 69 deletions
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  1. 109
      resemble.js

109
resemble.js
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@ -23,47 +23,42 @@ URL: https://github.com/Huddle/Resemble.js
alpha: 255
};
var targetPix = {r: 0, g: 0, b: 0, a: 0}; // isAntialiased
function colorsDistance(c1, c2){
return (Math.abs(c1.r - c2.r) + Math.abs(c1.g - c2.g) + Math.abs(c1.b - c2.b))/3;
}
var errorPixelTransform = {
flat : function (d1, d2){
return {
r: errorPixelColor.red,
g: errorPixelColor.green,
b: errorPixelColor.blue,
a: errorPixelColor.alpha
}
flat: function (px, offset, d1, d2) {
px[offset] = errorPixelColor.red;
px[offset + 1] = errorPixelColor.green;
px[offset + 2] = errorPixelColor.blue;
px[offset + 3] = errorPixelColor.alpha;
},
movement: function (d1, d2){
return {
r: ((d2.r*(errorPixelColor.red/255)) + errorPixelColor.red)/2,
g: ((d2.g*(errorPixelColor.green/255)) + errorPixelColor.green)/2,
b: ((d2.b*(errorPixelColor.blue/255)) + errorPixelColor.blue)/2,
a: d2.a
}
movement: function (px, offset, d1, d2) {
px[offset] = ((d2.r * (errorPixelColor.red / 255)) + errorPixelColor.red) / 2;
px[offset + 1] = ((d2.g * (errorPixelColor.green / 255)) + errorPixelColor.green) / 2;
px[offset + 2] = ((d2.b * (errorPixelColor.blue / 255)) + errorPixelColor.blue) / 2;
px[offset + 3] = d2.a;
},
flatDifferenceIntensity: function (d1, d2){
return {
r: errorPixelColor.red,
g: errorPixelColor.green,
b: errorPixelColor.blue,
a: colorsDistance(d1, d2)
}
flatDifferenceIntensity: function (px, offset, d1, d2) {
px[offset] = errorPixelColor.red;
px[offset + 1] = errorPixelColor.green;
px[offset + 2] = errorPixelColor.blue;
px[offset + 3] = colorsDistance(d1, d2);
},
movementDifferenceIntensity: function (d1, d2){
movementDifferenceIntensity: function (px, offset, d1, d2) {
var ratio = colorsDistance(d1, d2) / 255 * 0.8;
return {
r: ((1-ratio)*(d2.r*(errorPixelColor.red/255)) + ratio*errorPixelColor.red),
g: ((1-ratio)*(d2.g*(errorPixelColor.green/255)) + ratio*errorPixelColor.green),
b: ((1-ratio)*(d2.b*(errorPixelColor.blue/255)) + ratio*errorPixelColor.blue),
a: d2.a
}
px[offset] = ((1 - ratio) * (d2.r * (errorPixelColor.red / 255)) + ratio * errorPixelColor.red);
px[offset + 1] = ((1 - ratio) * (d2.g * (errorPixelColor.green / 255)) + ratio * errorPixelColor.green);
px[offset + 2] = ((1 - ratio) * (d2.b * (errorPixelColor.blue / 255)) + ratio * errorPixelColor.blue);
px[offset + 3] = d2.a;
}
};
var errorPixelTransformer = errorPixelTransform.flat;
var errorPixel = errorPixelTransform.flat;
var largeImageThreshold = 1200;
var useCrossOrigin = true;
var document = typeof window != "undefined" ? window.document : {};
@ -118,7 +113,7 @@ URL: https://github.com/Huddle/Resemble.js
var whiteTotal = 0;
var blackTotal = 0;
loop(height, width, function(verticalPos, horizontalPos){
loop(width, height, function(horizontalPos, verticalPos){
var offset = (verticalPos*width + horizontalPos) * 4;
var red = sourceImageData[offset];
var green = sourceImageData[offset + 1];
@ -292,7 +287,6 @@ URL: https://github.com/Huddle/Resemble.js
function isAntialiased(sourcePix, data, cacheSet, verticalPos, horizontalPos, width){
var offset;
var targetPix;
var distance = 1;
var i;
var j;
@ -310,9 +304,8 @@ URL: https://github.com/Huddle/Resemble.js
} else {
offset = ((verticalPos+j)*width + (horizontalPos+i)) * 4;
targetPix = getPixelInfo(data, offset, cacheSet);
if(targetPix === null){
if(!getPixelInfo(targetPix , data, offset, cacheSet)){
continue;
}
@ -345,14 +338,6 @@ URL: https://github.com/Huddle/Resemble.js
return false;
}
function errorPixel(px, offset, data1, data2){
var data = errorPixelTransformer(data1, data2);
px[offset] = data.r;
px[offset + 1] = data.g;
px[offset + 2] = data.b;
px[offset + 3] = data.a;
}
function copyPixel(px, offset, data){
px[offset] = data.r; //r
px[offset + 1] = data.g; //g
@ -367,30 +352,17 @@ URL: https://github.com/Huddle/Resemble.js
px[offset + 3] = data.a * pixelTransparency; //a
}
function getPixelInfo(data, offset, cacheSet){
var r;
var g;
var b;
var d;
var a;
r = data[offset];
if(typeof r !== 'undefined'){
g = data[offset+1];
b = data[offset+2];
a = data[offset+3];
d = {
r: r,
g: g,
b: b,
a: a
};
function getPixelInfo(dst, data, offset, cacheSet) {
if (data.length > offset) {
dst.r = data[offset];
dst.g = data[offset + 1];
dst.b = data[offset + 2];
dst.a = data[offset + 3];
return d;
} else {
return null;
return true;
}
return false;
}
function addBrightnessInfo(data){
@ -437,7 +409,10 @@ URL: https://github.com/Huddle/Resemble.js
skip = 6;
}
loop(height, width, function(verticalPos, horizontalPos){
var pixel1 = {r: 0, g: 0, b: 0, a: 0};
var pixel2 = { r: 0, g: 0, b: 0, a: 0 };
loop(width, height, function(horizontalPos, verticalPos){
if(skip){ // only skip if the image isn't small
if(verticalPos % skip === 0 || horizontalPos % skip === 0){
@ -446,10 +421,8 @@ URL: https://github.com/Huddle/Resemble.js
}
var offset = (verticalPos*width + horizontalPos) * 4;
var pixel1 = getPixelInfo(data1, offset, 1);
var pixel2 = getPixelInfo(data2, offset, 2);
if(pixel1 === null || pixel2 === null){
if (!getPixelInfo(pixel1, data1, offset, 1) || !getPixelInfo(pixel2, data2, offset, 2)) {
return;
}
@ -714,7 +687,7 @@ URL: https://github.com/Huddle/Resemble.js
}
if(options.errorType && errorPixelTransform[options.errorType] ){
errorPixelTransformer = errorPixelTransform[options.errorType];
errorPixel = errorPixelTransform[options.errorType];
}
pixelTransparency = isNaN(Number(options.transparency)) ? pixelTransparency : options.transparency;

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