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