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/**
* @preserve
* Copyright 2015-2018 Igor Bezkrovnyi
* All rights reserved. (MIT Licensed)
*
* point.ts - part of Image Quantization Library
*/
import { Y } from '../constants/bt709';
export interface PointRGBA {
r: number;
g: number;
b: number;
a: number;
}
/**
* v8 optimized class
* 1) "constructor" should have initialization with worst types
* 2) "set" should have |0 / >>> 0
*/
export class Point implements PointRGBA {
r: number;
g: number;
b: number;
a: number;
uint32: number;
rgba: number[]; // TODO: better name is quadruplet or quad may be?
// Lab : { L : number; a : number; b : number };
static createByQuadruplet(quadruplet: number[]) {
const point = new Point();
point.r = quadruplet[0] | 0;
point.g = quadruplet[1] | 0;
point.b = quadruplet[2] | 0;
point.a = quadruplet[3] | 0;
point._loadUINT32();
point._loadQuadruplet();
// point._loadLab();
return point;
}
static createByRGBA(red: number, green: number, blue: number, alpha: number) {
const point = new Point();
point.r = red | 0;
point.g = green | 0;
point.b = blue | 0;
point.a = alpha | 0;
point._loadUINT32();
point._loadQuadruplet();
// point._loadLab();
return point;
}
static createByUint32(uint32: number) {
const point = new Point();
point.uint32 = uint32 >>> 0;
point._loadRGBA();
point._loadQuadruplet();
// point._loadLab();
return point;
}
constructor() {
this.uint32 = -1 >>> 0;
this.r = this.g = this.b = this.a = 0;
this.rgba = new Array(4);
this.rgba[0] = 0;
this.rgba[1] = 0;
this.rgba[2] = 0;
this.rgba[3] = 0;
/*
this.Lab = {
L : 0.0,
a : 0.0,
b : 0.0
};
*/
}
from(point: Point) {
this.r = point.r;
this.g = point.g;
this.b = point.b;
this.a = point.a;
this.uint32 = point.uint32;
this.rgba[0] = point.r;
this.rgba[1] = point.g;
this.rgba[2] = point.b;
this.rgba[3] = point.a;
/*
this.Lab.L = point.Lab.L;
this.Lab.a = point.Lab.a;
this.Lab.b = point.Lab.b;
*/
}
/*
* TODO:
Luminance from RGB:
Luminance (standard for certain colour spaces): (0.2126*R + 0.7152*G + 0.0722*B) [1]
Luminance (perceived option 1): (0.299*R + 0.587*G + 0.114*B) [2]
Luminance (perceived option 2, slower to calculate): sqrt( 0.241*R^2 + 0.691*G^2 + 0.068*B^2 ) ? sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 ) (thanks to @MatthewHerbst) [http://alienryderflex.com/hsp.html]
*/
getLuminosity(useAlphaChannel: boolean) {
let r = this.r;
let g = this.g;
let b = this.b;
if (useAlphaChannel) {
r = Math.min(255, 255 - this.a + (this.a * r) / 255);
g = Math.min(255, 255 - this.a + (this.a * g) / 255);
b = Math.min(255, 255 - this.a + (this.a * b) / 255);
}
// var luma = this.r * Point._RED_COEFFICIENT + this.g * Point._GREEN_COEFFICIENT + this.b * Point._BLUE_COEFFICIENT;
/*
if(useAlphaChannel) {
luma = (luma * (255 - this.a)) / 255;
}
*/
return r * Y.RED + g * Y.GREEN + b * Y.BLUE;
}
private _loadUINT32() {
this.uint32 =
((this.a << 24) | (this.b << 16) | (this.g << 8) | this.r) >>> 0;
}
private _loadRGBA() {
this.r = this.uint32 & 0xff;
this.g = (this.uint32 >>> 8) & 0xff;
this.b = (this.uint32 >>> 16) & 0xff;
this.a = (this.uint32 >>> 24) & 0xff;
}
private _loadQuadruplet() {
this.rgba[0] = this.r;
this.rgba[1] = this.g;
this.rgba[2] = this.b;
this.rgba[3] = this.a;
/*
var xyz = rgb2xyz(this.r, this.g, this.b);
var lab = xyz2lab(xyz.x, xyz.y, xyz.z);
this.lab.l = lab.l;
this.lab.a = lab.a;
this.lab.b = lab.b;
*/
}
/*
private _loadLab() : void {
var Lab = Color.Conversion.rgb2lab(this.r, this.g, this.b);
this.Lab.L = Lab.L;
this.Lab.a = Lab.a;
this.Lab.b = Lab.b;
}
*/
}