215 lines
4.1 KiB
JavaScript
215 lines
4.1 KiB
JavaScript
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import {
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FileLoader,
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Loader
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} from 'three';
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import opentype from '../libs/opentype.module.js';
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/**
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* Requires opentype.js to be included in the project.
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* Loads TTF files and converts them into typeface JSON that can be used directly
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* to create THREE.Font objects.
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*/
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class TTFLoader extends Loader {
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constructor( manager ) {
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super( manager );
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this.reversed = false;
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}
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load( url, onLoad, onProgress, onError ) {
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const scope = this;
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const loader = new FileLoader( this.manager );
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loader.setPath( this.path );
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loader.setResponseType( 'arraybuffer' );
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loader.setRequestHeader( this.requestHeader );
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loader.setWithCredentials( this.withCredentials );
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loader.load( url, function ( buffer ) {
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try {
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onLoad( scope.parse( buffer ) );
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} catch ( e ) {
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if ( onError ) {
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onError( e );
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} else {
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console.error( e );
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}
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scope.manager.itemError( url );
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}
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}, onProgress, onError );
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}
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parse( arraybuffer ) {
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function convert( font, reversed ) {
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const round = Math.round;
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const glyphs = {};
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const scale = ( 100000 ) / ( ( font.unitsPerEm || 2048 ) * 72 );
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const glyphIndexMap = font.encoding.cmap.glyphIndexMap;
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const unicodes = Object.keys( glyphIndexMap );
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for ( let i = 0; i < unicodes.length; i ++ ) {
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const unicode = unicodes[ i ];
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const glyph = font.glyphs.glyphs[ glyphIndexMap[ unicode ] ];
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if ( unicode !== undefined ) {
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const token = {
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ha: round( glyph.advanceWidth * scale ),
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x_min: round( glyph.xMin * scale ),
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x_max: round( glyph.xMax * scale ),
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o: ''
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};
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if ( reversed ) {
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glyph.path.commands = reverseCommands( glyph.path.commands );
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}
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glyph.path.commands.forEach( function ( command ) {
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if ( command.type.toLowerCase() === 'c' ) {
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command.type = 'b';
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}
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token.o += command.type.toLowerCase() + ' ';
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if ( command.x !== undefined && command.y !== undefined ) {
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token.o += round( command.x * scale ) + ' ' + round( command.y * scale ) + ' ';
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}
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if ( command.x1 !== undefined && command.y1 !== undefined ) {
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token.o += round( command.x1 * scale ) + ' ' + round( command.y1 * scale ) + ' ';
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}
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if ( command.x2 !== undefined && command.y2 !== undefined ) {
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token.o += round( command.x2 * scale ) + ' ' + round( command.y2 * scale ) + ' ';
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}
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} );
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glyphs[ String.fromCodePoint( glyph.unicode ) ] = token;
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}
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}
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return {
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glyphs: glyphs,
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familyName: font.getEnglishName( 'fullName' ),
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ascender: round( font.ascender * scale ),
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descender: round( font.descender * scale ),
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underlinePosition: font.tables.post.underlinePosition,
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underlineThickness: font.tables.post.underlineThickness,
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boundingBox: {
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xMin: font.tables.head.xMin,
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xMax: font.tables.head.xMax,
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yMin: font.tables.head.yMin,
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yMax: font.tables.head.yMax
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},
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resolution: 1000,
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original_font_information: font.tables.name
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};
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}
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function reverseCommands( commands ) {
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const paths = [];
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let path;
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commands.forEach( function ( c ) {
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if ( c.type.toLowerCase() === 'm' ) {
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path = [ c ];
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paths.push( path );
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} else if ( c.type.toLowerCase() !== 'z' ) {
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path.push( c );
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}
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} );
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const reversed = [];
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paths.forEach( function ( p ) {
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const result = {
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type: 'm',
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x: p[ p.length - 1 ].x,
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y: p[ p.length - 1 ].y
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};
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reversed.push( result );
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for ( let i = p.length - 1; i > 0; i -- ) {
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const command = p[ i ];
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const result = { type: command.type };
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if ( command.x2 !== undefined && command.y2 !== undefined ) {
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result.x1 = command.x2;
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result.y1 = command.y2;
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result.x2 = command.x1;
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result.y2 = command.y1;
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} else if ( command.x1 !== undefined && command.y1 !== undefined ) {
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result.x1 = command.x1;
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result.y1 = command.y1;
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}
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result.x = p[ i - 1 ].x;
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result.y = p[ i - 1 ].y;
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reversed.push( result );
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}
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} );
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return reversed;
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}
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return convert( opentype.parse( arraybuffer ), this.reversed );
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}
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}
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export { TTFLoader };
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