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import TTFGlyph from './TTFGlyph';
import r from '@foliojs-fork/restructure';
let SBIXImage = new r.Struct({
originX: r.uint16,
originY: r.uint16,
type: new r.String(4),
data: new r.Buffer(t => t.parent.buflen - t._currentOffset)
});
/**
* Represents a color (e.g. emoji) glyph in Apple's SBIX format.
*/
export default class SBIXGlyph extends TTFGlyph {
/**
* Returns an object representing a glyph image at the given point size.
* The object has a data property with a Buffer containing the actual image data,
* along with the image type, and origin.
*
* @param {number} size
* @return {object}
*/
getImageForSize(size) {
for (let i = 0; i < this._font.sbix.imageTables.length; i++) {
var table = this._font.sbix.imageTables[i];
if (table.ppem >= size) { break; }
}
let offsets = table.imageOffsets;
let start = offsets[this.id];
let end = offsets[this.id + 1];
if (start === end) {
return null;
}
this._font.stream.pos = start;
return SBIXImage.decode(this._font.stream, {buflen: end - start});
}
render(ctx, size) {
let img = this.getImageForSize(size);
if (img != null) {
let scale = size / this._font.unitsPerEm;
ctx.image(img.data, {height: size, x: img.originX, y: (this.bbox.minY - img.originY) * scale});
}
if (this._font.sbix.flags.renderOutlines) {
super.render(ctx, size);
}
}
}