molstar
Version:
A comprehensive macromolecular library.
46 lines (45 loc) • 1.63 kB
JavaScript
;
/**
* Copyright (c) 2019-2021 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.PixelData = void 0;
var PixelData;
(function (PixelData) {
function create(array, width, height) {
return { array, width, height };
}
PixelData.create = create;
/** horizontally flips the pixel data in-place */
function flipY(pixelData) {
const { array, width, height } = pixelData;
const itemSize = array.length / (width * height);
const widthIS = width * itemSize;
for (let i = 0, maxI = height / 2; i < maxI; ++i) {
for (let j = 0, maxJ = widthIS; j < maxJ; ++j) {
const index1 = i * widthIS + j;
const index2 = (height - i - 1) * widthIS + j;
const tmp = array[index1];
array[index1] = array[index2];
array[index2] = tmp;
}
}
return pixelData;
}
PixelData.flipY = flipY;
/** to undo pre-multiplied alpha */
function divideByAlpha(pixelData) {
const { array } = pixelData;
const factor = (array instanceof Uint8Array) ? 255 : 1;
for (let i = 0, il = array.length; i < il; i += 4) {
const a = array[i + 3] / factor;
array[i] /= a;
array[i + 1] /= a;
array[i + 2] /= a;
}
return pixelData;
}
PixelData.divideByAlpha = divideByAlpha;
})(PixelData || (exports.PixelData = PixelData = {}));