Make outline simplification a kind of geometry, as well as skew correction (#961).

font-src/caching/index.js

@@ -3,7 +3,7 @@
 const fs = require("fs-extra");
 const zlib = require("zlib");
 
-const Edition = 1;
+const Edition = 2;
 
 class Cache {
 	constructor() {

font-src/gen/finalize/glyphs.js

@@ -3,6 +3,7 @@
 const TypoGeom = require("typo-geom");
 const Geom = require("../../support/geometry");
 const Point = require("../../support/point");
+const Transform = require("../../support/transform");
 const CurveUtil = require("../../support/curve-util");
 const util = require("util");
 
@@ -42,11 +43,13 @@ function flattenSimpleGlyph(cache, skew, g) {
 		g.includeContours(CurveUtil.repToShape(cached), 0, 0);
 		cache.saveGF(ck, cached);
 	} else {
-		let cs = g.geometry.asContours();
-		for (const contour of cs) for (const z of contour) z.x -= z.y * skew;
-		cs = simplifyContours(cs);
-		for (const contour of cs) for (const z of contour) z.x += z.y * skew;
-
+		const tfBack = new Transform(1, -skew, 0, 1, 0, 0);
+		const tfForward = new Transform(1, +skew, 0, 1, 0, 0);
+		const g1 = new Geom.TransformedGeometry(
+			new SimplifyGeometry(new Geom.TransformedGeometry(g.geometry, tfBack)),
+			tfForward
+		);
+		const cs = g1.asContours();
 		g.clearGeometry();
 		g.includeContours(cs, 0, 0);
 		if (ck) cache.saveGF(ck, CurveUtil.shapeToRep(cs));
@@ -55,7 +58,13 @@ function flattenSimpleGlyph(cache, skew, g) {
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
-function simplifyContours(source) {
+class SimplifyGeometry extends Geom.GeometryBase {
+	constructor(g) {
+		super();
+		this.m_geom = g;
+	}
+	asContours() {
+		const source = this.m_geom.asContours();
 		const sink = new FairizedShapeSink();
 		TypoGeom.ShapeConv.transferGenericShape(
 			TypoGeom.Fairize.fairizeBezierShape(
@@ -70,6 +79,24 @@ function simplifyContours(source) {
 		);
 		return sink.contours;
 	}
+	asReferences() {
+		return null;
+	}
+	filterTag(fn) {
+		return this.m_geom.filterTag(fn);
+	}
+	isEmpty() {
+		return this.m_geom.isEmpty();
+	}
+	measureComplexity() {
+		return this.m_geom.measureComplexity();
+	}
+	toShapeStringOrNull() {
+		const sTarget = this.m_geom.toShapeStringOrNull();
+		if (!sTarget) return null;
+		return `SimplifyGeometry{${sTarget}}`;
+	}
+}
 
 class FairizedShapeSink {
 	constructor() {

font-src/support/geometry.js

@@ -38,7 +38,9 @@ class ContourGeometry extends GeometryBase {
 	}
 	asContours() {
 		if (this.isEmpty()) return [];
-		else return [this.m_points];
+		let c1 = [];
+		for (const z of this.m_points) c1.push(Point.from(z.type, z));
+		return [c1];
 	}
 	asReferences() {
 		return null;