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lut-spi3d.js
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lut-spi3d.js
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/* lut-spi3d.js
* .spi3d LUT building / parsing for the LUTCalc Web App.
* 3rd June 2015
*
* LUTCalc generates 1D and 3D Lookup Tables (LUTs) for video cameras that shoot log gammas,
* principally the Sony CineAlta line.
*
* By Ben Turley, http://turley.tv
* First License: GPLv2
* Github: https://github.com/cameramanben/LUTCalc
*/
function spi3dLUT(messages, isLE) {
this.messages = messages;
this.isLE = isLE;
}
spi3dLUT.prototype.build = function(buff, fileName, ext) {
var lut = new Float64Array(buff);
var info = {};
this.messages.getInfo(info);
var m = parseInt(info.dimension);
var d = '';
var precision = this.messages.getPrecision();
var j;
for (var r=0; r<m; r++) {
for (var g=0; g<m; g++) {
for (var b=0; b<m; b++) {
j = (r + (g*m) + (b*m*m))*3;
d += r.toString() + ' ' + g.toString() + ' ' + b.toString() + ' ' +
lut[ j ].toFixed(precision).toString() + ' ' +
lut[j+1].toFixed(precision).toString() + ' ' +
lut[j+2].toFixed(precision).toString() + "\n";
}
}
}
return {
lut: this.header(info) + d,
fileName: fileName,
ext: ext
};
};
spi3dLUT.prototype.header = function(info) {
var out = 'SPILUT 1.0' + "\n";
out += '3 3' + "\n";
out += info.dimension.toString() + ' ' + info.dimension.toString() + ' ' + info.dimension.toString() + "\n";
return out;
};
spi3dLUT.prototype.parse = function(title, text, lutMaker, lutDest) {
var dimensions = false;
var size = false;
var minimum = [0,0,0];
var maximum = [1,1,1];
var max = text.length;
if (max === 0) {
return false;
}
var line = text[0].trim();
var lower = line.toLowerCase();
if (lower.search('spilut') >= 0) {
var i;
for (i=0; i<max; i++) {
line = text[i].trim();
lower = line.toLowerCase();
j = line.charAt(0);
if ((!isNaN(parseFloat(j)) && isFinite(j))) {
var vals = line.split(/\s+/g);
if (vals.length === 2) {
// currently unknown now to handle '3 3' line
dimensions = 3;
} else if (vals.length === 3) {
if (!isNaN(vals[0]) && !isNaN(vals[1]) && !isNaN(vals[2])) {
// can have different sizes for each colour channel - hmmmm.
size = [parseInt(vals[0]),parseInt(vals[1]),parseInt(vals[2])];
// for now, LUTCalc can't handle 3D LUTs with multiple sizes
if (size[0] !== size[1] || size[1] !== size[2] || size[2] !== size[0]) {
return false;
}
}
} else if (vals.length > 3) {
// stop parsing when the LUT data is reached
break;
}
}
}
if (dimensions && size) {
var arraySize = size;
if (dimensions === 3) {
arraySize = size[0]*size[1]*size[2];
}
var R = new Float64Array(arraySize);
var G = new Float64Array(arraySize);
var B = new Float64Array(arraySize);
var s;
var t=0;
for (var k=i; k<max; k++) {
var line = text[k].trim();
var j = line.charAt(0);
if ((!isNaN(parseFloat(j)) && isFinite(j)) || j === '-') {
var vals = line.split(/\s+/g);
if (vals.length === 6 && (!isNaN(vals[0]) && !isNaN(vals[1]) && !isNaN(vals[2]) && !isNaN(vals[3]) && !isNaN(vals[4]) && !isNaN(vals[5]))) {
s = parseInt(vals[0]) + (parseInt(vals[1])*size[0]) + (parseInt(vals[2])*size[0]*size[1]);
R[s] = parseFloat(vals[3]);
G[s] = parseFloat(vals[4]);
B[s] = parseFloat(vals[5]);
t++;
}
}
}
if (t === arraySize) {
return lutMaker.setLUT(
lutDest,
{
title: title,
format: 'spi3d',
dims: dimensions,
s: size[0],
min: minimum,
max: maximum,
C: [R.buffer,G.buffer,B.buffer]
}
);
/*
lut.setDetails({
title: title,
format: 'spi3d',
dims: dimensions,
s: size[0],
min: minimum,
max: maximum,
C: [R.buffer,G.buffer,B.buffer]
});
return true;
*/
} else {
return false;
}
} else {
return false;
}
} else {
return false;
}
};