48 lines
2.1 KiB
TypeScript
48 lines
2.1 KiB
TypeScript
// (c) Copyright Ascensio System SIA 2009-2024
|
|
//
|
|
// This program is a free software product.
|
|
// You can redistribute it and/or modify it under the terms
|
|
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
|
|
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
|
|
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
|
|
// any third-party rights.
|
|
//
|
|
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
|
|
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
|
|
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
|
|
//
|
|
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
|
|
//
|
|
// The interactive user interfaces in modified source and object code versions of the Program must
|
|
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
|
|
//
|
|
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
|
|
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
|
|
// trademark law for use of our trademarks.
|
|
//
|
|
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
|
|
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
|
|
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
|
|
|
|
import UTIF from "utif";
|
|
|
|
export const decodeTiff = (arrayBuffer: ArrayBuffer): Promise<Blob | null> => {
|
|
const ifds = UTIF.decode(arrayBuffer);
|
|
UTIF.decodeImage(arrayBuffer, ifds[0]);
|
|
|
|
const rgb = UTIF.toRGBA8(ifds[0]);
|
|
|
|
const pixels = new Uint8ClampedArray(rgb);
|
|
const image = new ImageData(pixels, ifds[0].width, ifds[0].height);
|
|
|
|
const canvas = document.createElement("canvas");
|
|
canvas.width = image.width;
|
|
canvas.height = image.height;
|
|
const ctx = canvas.getContext("2d");
|
|
|
|
return new Promise((resolve) => {
|
|
ctx?.putImageData(image, 0, 0);
|
|
canvas.toBlob(resolve);
|
|
});
|
|
};
|