matrix-react-sdk
Version:
SDK for matrix.org using React
92 lines (87 loc) • 12.4 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.BLURHASH_FIELD = void 0;
exports.createThumbnail = createThumbnail;
var _BlurhashEncoder = require("../BlurhashEncoder");
/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.
SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/
const BLURHASH_FIELD = exports.BLURHASH_FIELD = "xyz.amorgan.blurhash"; // MSC2448
const MAX_WIDTH = 800;
const MAX_HEIGHT = 600;
/**
* Create a thumbnail for a image DOM element.
* The image will be smaller than MAX_WIDTH and MAX_HEIGHT.
* The thumbnail will have the same aspect ratio as the original.
* Draws the element into a canvas using CanvasRenderingContext2D.drawImage
* Then calls Canvas.toBlob to get a blob object for the image data.
*
* Since it needs to calculate the dimensions of the source image and the
* thumbnailed image it returns an info object filled out with information
* about the original image and the thumbnail.
*
* @param {HTMLElement} element The element to thumbnail.
* @param {number} inputWidth The width of the image in the input element.
* @param {number} inputHeight the width of the image in the input element.
* @param {string} mimeType The mimeType to save the blob as.
* @param {boolean} calculateBlurhash Whether to calculate a blurhash of the given image too.
* @return {Promise} A promise that resolves with an object with an info key
* and a thumbnail key.
*/
async function createThumbnail(element, inputWidth, inputHeight, mimeType, calculateBlurhash = true) {
let targetWidth = inputWidth;
let targetHeight = inputHeight;
if (targetHeight > MAX_HEIGHT) {
targetWidth = Math.floor(targetWidth * (MAX_HEIGHT / targetHeight));
targetHeight = MAX_HEIGHT;
}
if (targetWidth > MAX_WIDTH) {
targetHeight = Math.floor(targetHeight * (MAX_WIDTH / targetWidth));
targetWidth = MAX_WIDTH;
}
let canvas;
let context;
try {
canvas = new window.OffscreenCanvas(targetWidth, targetHeight);
context = canvas.getContext("2d");
} catch (e) {
// Fallback support for other browsers (Safari and Firefox for now)
canvas = document.createElement("canvas");
canvas.width = targetWidth;
canvas.height = targetHeight;
context = canvas.getContext("2d");
}
context.drawImage(element, 0, 0, targetWidth, targetHeight);
let thumbnailPromise;
if (window.OffscreenCanvas && canvas instanceof OffscreenCanvas) {
thumbnailPromise = canvas.convertToBlob({
type: mimeType
});
} else {
thumbnailPromise = new Promise(resolve => canvas.toBlob(resolve, mimeType));
}
const imageData = context.getImageData(0, 0, targetWidth, targetHeight);
// thumbnailPromise and blurhash promise are being awaited concurrently
const blurhash = calculateBlurhash ? await _BlurhashEncoder.BlurhashEncoder.instance.getBlurhash(imageData) : undefined;
const thumbnail = await thumbnailPromise;
return {
info: {
thumbnail_info: {
w: targetWidth,
h: targetHeight,
mimetype: thumbnail.type,
size: thumbnail.size
},
w: inputWidth,
h: inputHeight,
[BLURHASH_FIELD]: blurhash
},
thumbnail
};
}
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await BlurhashEncoder.instance.getBlurhash(imageData) : undefined;\n    const thumbnail = await thumbnailPromise;\n\n    return {\n        info: {\n            thumbnail_info: {\n                w: targetWidth,\n                h: targetHeight,\n                mimetype: thumbnail.type,\n                size: thumbnail.size,\n            },\n            w: inputWidth,\n            h: inputHeight,\n            [BLURHASH_FIELD]: blurhash,\n        },\n        thumbnail,\n    };\n}\n"],"mappings":";;;;;;;AAUA,IAAAA,gBAAA,GAAAC,OAAA;AAVA;AACA;AACA;AACA;AACA;AACA;AACA;;AAQO,MAAMC,cAAc,GAAAC,OAAA,CAAAD,cAAA,GAAG,sBAAsB,CAAC,CAAC;;AAmBtD,MAAME,SAAS,GAAG,GAAG;AACrB,MAAMC,UAAU,GAAG,GAAG;;AAEtB;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,eAAeC,eAAeA,CACjCC,OAA6B,EAC7BC,UAAkB,EAClBC,WAAmB,EACnBC,QAAgB,EAChBC,iBAAiB,GAAG,IAAI,EACL;EACnB,IAAIC,WAAW,GAAGJ,UAAU;EAC5B,IAAIK,YAAY,GAAGJ,WAAW;EAC9B,IAAII,YAAY,GAAGR,UAAU,EAAE;IAC3BO,WAAW,GAAGE,IAAI,CAACC,KAAK,CAACH,WAAW,IAAIP,UAAU,GAAGQ,YAAY,CAAC,CAAC;IACnEA,YAAY,GAAGR,UAAU;EAC7B;EACA,IAAIO,WAAW,GAAGR,SAAS,EAAE;IACzBS,YAAY,GAAGC,IAAI,CAACC,KAAK,CAACF,YAAY,IAAIT,SAAS,GAAGQ,WAAW,CAAC,CAAC;IACnEA,WAAW,GAAGR,SAAS;EAC3B;EAEA,IAAIY,MAA2C;EAC/C,IAAIC,OAAqE;EACzE,IAAI;IACAD,MAAM,GAAG,IAAIE,MAAM,CAACC,eAAe,CAACP,WAAW,EAAEC,YAAY,CAAC;IAC9DI,OAAO,GAAGD,MAAM,CAACI,UAAU,CAAC,IAAI,CAAsC;EAC1E,CAAC,CAAC,OAAOC,CAAC,EAAE;IACR;IACAL,MAAM,GAAGM,QAAQ,CAACC,aAAa,CAAC,QAAQ,CAAC;IACzCP,MAAM,CAACQ,KAAK,GAAGZ,WAAW;IAC1BI,MAAM,CAACS,MAAM,GAAGZ,YAAY;IAC5BI,OAAO,GAAGD,MAAM,CAACI,UAAU,CAAC,IAAI,CAAE;EACtC;EAEAH,OAAO,CAACS,SAAS,CAACnB,OAAO,EAAE,CAAC,EAAE,CAAC,EAAEK,WAAW,EAAEC,YAAY,CAAC;EAE3D,IAAIc,gBAA+B;EACnC,IAAIT,MAAM,CAACC,eAAe,IAAIH,MAAM,YAAYG,eAAe,EAAE;IAC7DQ,gBAAgB,GAAGX,MAAM,CAACY,aAAa,CAAC;MAAEC,IAAI,EAAEnB;IAAS,CAAC,CAAC;EAC/D,CAAC,MAAM;IACHiB,gBAAgB,GAAG,IAAIG,OAAO,CAAQC,OAAO,IACxCf,MAAM,CAAuBgB,MAAM,CAACD,OAAO,EAAkBrB,QAAQ,CAC1E,CAAC;EACL;EAEA,MAAMuB,SAAS,GAAGhB,OAAO,CAACiB,YAAY,CAAC,CAAC,EAAE,CAAC,EAAEtB,WAAW,EAAEC,YAAY,CAAC;EACvE;EACA,MAAMsB,QAAQ,GAAGxB,iBAAiB,GAAG,MAAMyB,gCAAe,CAACC,QAAQ,CAACC,WAAW,CAACL,SAAS,CAAC,GAAGM,SAAS;EACtG,MAAMC,SAAS,GAAG,MAAMb,gBAAgB;EAExC,OAAO;IACHc,IAAI,EAAE;MACFC,cAAc,EAAE;QACZC,CAAC,EAAE/B,WAAW;QACdgC,CAAC,EAAE/B,YAAY;QACfgC,QAAQ,EAAEL,SAAS,CAACX,IAAI;QACxBiB,IAAI,EAAEN,SAAS,CAACM;MACpB,CAAC;MACDH,CAAC,EAAEnC,UAAU;MACboC,CAAC,EAAEnC,WAAW;MACd,CAACP,cAAc,GAAGiC;IACtB,CAAC;IACDK;EACJ,CAAC;AACL","ignoreList":[]}