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File size: 2,583 Bytes
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// We want to preserve the rotation center of exported SVGs when they are later imported.
// Unfortunately, the SVG itself does not have sufficient information to accomplish this.
// Instead we must add a small amount of extra information to the end of exported SVGs
// that can be read on import.
// Adding this comment in scratch-paint is not a viable approach because the user can
// open projects not made with TurboWarp and we want costumes exported from there to
// have their center saved even if they haven't been edited.
let _TextEncoder;
let _TextDecoder;
if (typeof TextEncoder === 'undefined') {
_TextEncoder = require('text-encoding').TextEncoder;
_TextDecoder = require('text-encoding').TextDecoder;
} else {
_TextEncoder = TextEncoder;
_TextDecoder = TextDecoder;
}
// Using literal HTML comments tokens will cause this script to be very hard to inline in
// a <script> element, so we'll instead do this terrible hack which the minifier probably
// won't be able to optimize away.
const HTML_COMMENT_START = `<!${'-'.repeat(2)}`;
const HTML_COMMENT_END = `${'-'.repeat(2)}>`;
const regex = new RegExp(
`${HTML_COMMENT_START}rotationCenter:(-?[\\d\\.]+):(-?[\\d\\.]+)${HTML_COMMENT_END}$`
);
/**
* @param {string} svgString SVG source
* @returns {[number, number]|null} The detected rotation center of the SVG, if any.
*/
const parseVectorMetadata = svgString => {
// TODO: see if this is slow on large strings
const match = svgString.match(regex);
if (!match) {
return null;
}
const detectedX = +match[1];
const detectedY = +match[2];
if (Number.isNaN(detectedX) || Number.isNaN(detectedY)) {
return null;
}
return [detectedX, detectedY];
};
/**
* @param {Costume} costume scratch-vm costume object
* @returns {Uint8Array} Binary data to export
*/
const exportCostume = costume => {
/** @type {Uint8Array} */
const originalData = costume.asset.data;
if (costume.dataFormat !== 'svg') {
return originalData;
}
let decodedData = new _TextDecoder().decode(originalData);
// It's okay that the regex isn't global because it can only match one item anyways.
decodedData = decodedData.replace(regex, '');
const centerX = costume.rotationCenterX;
const centerY = costume.rotationCenterY;
const extraData = `${HTML_COMMENT_START}rotationCenter:${centerX}:${centerY}${HTML_COMMENT_END}`;
decodedData += extraData;
return new _TextEncoder().encode(decodedData);
};
module.exports = {
parseVectorMetadata,
exportCostume
};
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