mirror of
https://github.com/superseriousbusiness/gotosocial.git
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66 lines
2 KiB
JavaScript
66 lines
2 KiB
JavaScript
/*
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GoToSocial
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Copyright (C) GoToSocial Authors admin@gotosocial.org
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SPDX-License-Identifier: AGPL-3.0-or-later
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import { decode } from "blurhash";
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Array.from(document.getElementsByClassName('blurhash-container')).forEach(blurhashContainer => {
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const hash = blurhashContainer.dataset.blurhashHash;
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const thumbHeight = blurhashContainer.dataset.blurhashHeight;
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const thumbWidth = blurhashContainer.dataset.blurhashWidth;
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const thumbAspect = blurhashContainer.dataset.blurhashAspect;
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/*
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It's very expensive to draw big canvases
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with blurhashes, so use tiny ones, keeping
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aspect ratio of the original thumbnail.
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*/
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var useWidth = 32;
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var useHeight = 32;
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switch (true) {
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case thumbWidth > thumbHeight:
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useHeight = Math.round(useWidth / thumbAspect);
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break;
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case thumbHeight > thumbWidth:
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useWidth = Math.round(useHeight * thumbAspect);
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break;
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}
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const pixels = decode(
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hash,
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useWidth,
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useHeight,
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);
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// Create canvas of appropriate size.
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const canvas = document.createElement("canvas");
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canvas.width = useWidth;
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canvas.height = useHeight;
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// Draw the image data into the canvas.
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const ctx = canvas.getContext("2d");
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const imageData = ctx.createImageData(
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useWidth,
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useHeight,
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);
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imageData.data.set(pixels);
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ctx.putImageData(imageData, 0, 0);
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// Put the canvas inside the container.
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blurhashContainer.appendChild(canvas);
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});
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