com.rafaskoberg.gdx.typinglabel.GlyphUtils Maven / Gradle / Ivy

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package com.rafaskoberg.gdx.typinglabel;

import com.badlogic.gdx.graphics.g2d.BitmapFont.Glyph;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.Pool;
import com.badlogic.gdx.utils.ReflectionPool;

/** Utility class to manage {@link Glyph} pooling and cloning. */
class GlyphUtils {
	private static final Pool pool = new ReflectionPool(Glyph.class) {
		protected void reset (Glyph glyph) {
			GlyphUtils.reset(glyph);
		};
	};

	/** Returns a glyph from this pool. The glyph may be new (from {@link Pool#newObject()}) or reused (previously
	 * {@link Pool#free(Object) freed}). */
	static Glyph obtain () {
		return pool.obtain();
	}

	/** Returns a glyph from this pool and clones it from the given one. The glyph may be new (from {@link Pool#newObject()}) or
	 * reused (previously {@link Pool#free(Object) freed}). */
	static Glyph obtainClone (Glyph from) {
		Glyph glyph = pool.obtain();
		clone(from, glyph);
		return glyph;
	}

	/** Puts the specified glyph in the pool, making it eligible to be returned by {@link #obtain()}. If the pool already contains
	 * {@link #max} free glyphs, the specified glyph is reset but not added to the pool. */
	static void free (Glyph glyph) {
		pool.free(glyph);
	}

	/** Puts the specified glyphs in the pool. Null glyphs within the array are silently ignored.
	 * @see #free(Object) */
	static void freeAll (Array glyphs) {
		pool.freeAll(glyphs);
	}

	/** Called when a glyph is freed to clear the state of the glyph for possible later reuse. */
	static void reset (Glyph glyph) {
		glyph.id = 0;
		glyph.srcX = 0;
		glyph.srcY = 0;
		glyph.width = 0;
		glyph.height = 0;
		glyph.u = 0;
		glyph.v = 0;
		glyph.u2 = 0;
		glyph.v2 = 0;
		glyph.xoffset = 0;
		glyph.yoffset = 0;
		glyph.xadvance = 0;
		glyph.kerning = null;
		glyph.fixedWidth = false;
	}

	/** Copies all contents from the first glyph to the second one. */
	static void clone (Glyph from, Glyph to) {
		to.id = from.id;
		to.srcX = from.srcX;
		to.srcY = from.srcY;
		to.width = from.width;
		to.height = from.height;
		to.u = from.u;
		to.v = from.v;
		to.u2 = from.u2;
		to.v2 = from.v2;
		to.xoffset = from.xoffset;
		to.yoffset = from.yoffset;
		to.xadvance = from.xadvance;
		to.kerning = from.kerning; // Keep the same instance, there's no reason to deep clone it
		to.fixedWidth = from.fixedWidth;
	}

}