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e7b2eb4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | // @flow
import {AlphaImage} from '../util/image';
import Protobuf from 'pbf';
const border = 3;
import type {StyleGlyph} from './style_glyph';
function readFontstacks(tag: number, glyphs: Array<StyleGlyph>, pbf: Protobuf) {
if (tag === 1) {
pbf.readMessage(readFontstack, glyphs);
}
}
function readFontstack(tag: number, glyphs: Array<StyleGlyph>, pbf: Protobuf) {
if (tag === 3) {
const {id, bitmap, width, height, left, top, advance} = pbf.readMessage(readGlyph, {});
glyphs.push({
id,
bitmap: new AlphaImage({
width: width + 2 * border,
height: height + 2 * border
}, bitmap),
metrics: {width, height, left, top, advance}
});
}
}
function readGlyph(tag: number, glyph: Object, pbf: Protobuf) {
if (tag === 1) glyph.id = pbf.readVarint();
else if (tag === 2) glyph.bitmap = pbf.readBytes();
else if (tag === 3) glyph.width = pbf.readVarint();
else if (tag === 4) glyph.height = pbf.readVarint();
else if (tag === 5) glyph.left = pbf.readSVarint();
else if (tag === 6) glyph.top = pbf.readSVarint();
else if (tag === 7) glyph.advance = pbf.readVarint();
}
export default function (data: ArrayBuffer | Uint8Array): Array<StyleGlyph> {
return new Protobuf(data).readFields(readFontstacks, []);
}
export const GLYPH_PBF_BORDER = border;
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