@pixi/utils/lib/color/premultiply.js

Collection of utilities used by PixiJS

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var constants = require('@pixi/constants');

function mapPremultipliedBlendModes() {
  const pm = [];
  const npm = [];
  for (let i = 0; i < 32; i++) {
    pm[i] = i;
    npm[i] = i;
  }
  pm[constants.BLEND_MODES.NORMAL_NPM] = constants.BLEND_MODES.NORMAL;
  pm[constants.BLEND_MODES.ADD_NPM] = constants.BLEND_MODES.ADD;
  pm[constants.BLEND_MODES.SCREEN_NPM] = constants.BLEND_MODES.SCREEN;
  npm[constants.BLEND_MODES.NORMAL] = constants.BLEND_MODES.NORMAL_NPM;
  npm[constants.BLEND_MODES.ADD] = constants.BLEND_MODES.ADD_NPM;
  npm[constants.BLEND_MODES.SCREEN] = constants.BLEND_MODES.SCREEN_NPM;
  const array = [];
  array.push(npm);
  array.push(pm);
  return array;
}
const premultiplyBlendMode = mapPremultipliedBlendModes();
function correctBlendMode(blendMode, premultiplied) {
  return premultiplyBlendMode[premultiplied ? 1 : 0][blendMode];
}
function premultiplyRgba(rgb, alpha, out, premultiply) {
  out = out || new Float32Array(4);
  if (premultiply || premultiply === void 0) {
    out[0] = rgb[0] * alpha;
    out[1] = rgb[1] * alpha;
    out[2] = rgb[2] * alpha;
  } else {
    out[0] = rgb[0];
    out[1] = rgb[1];
    out[2] = rgb[2];
  }
  out[3] = alpha;
  return out;
}
function premultiplyTint(tint, alpha) {
  if (alpha === 1) {
    return (alpha * 255 << 24) + tint;
  }
  if (alpha === 0) {
    return 0;
  }
  let R = tint >> 16 & 255;
  let G = tint >> 8 & 255;
  let B = tint & 255;
  R = R * alpha + 0.5 | 0;
  G = G * alpha + 0.5 | 0;
  B = B * alpha + 0.5 | 0;
  return (alpha * 255 << 24) + (R << 16) + (G << 8) + B;
}
function premultiplyTintToRgba(tint, alpha, out, premultiply) {
  out = out || new Float32Array(4);
  out[0] = (tint >> 16 & 255) / 255;
  out[1] = (tint >> 8 & 255) / 255;
  out[2] = (tint & 255) / 255;
  if (premultiply || premultiply === void 0) {
    out[0] *= alpha;
    out[1] *= alpha;
    out[2] *= alpha;
  }
  out[3] = alpha;
  return out;
}

exports.correctBlendMode = correctBlendMode;
exports.premultiplyBlendMode = premultiplyBlendMode;
exports.premultiplyRgba = premultiplyRgba;
exports.premultiplyTint = premultiplyTint;
exports.premultiplyTintToRgba = premultiplyTintToRgba;
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