binding/HarfBuzzSharp/FontFunctions.cs

#nullable disable

using System;

namespace HarfBuzzSharp
{
	public unsafe class FontFunctions : NativeObject
	{
		private static readonly Lazy<FontFunctions> emptyFontFunctions =
			new Lazy<FontFunctions> (() => new StaticFontFunctions (HarfBuzzApi.hb_font_funcs_get_empty ()));

		public FontFunctions ()
			: this (HarfBuzzApi.hb_font_funcs_create ())
		{
		}

		internal FontFunctions (IntPtr handle)
			: base (handle)
		{
		}

		public static FontFunctions Empty => emptyFontFunctions.Value;

		public bool IsImmutable => HarfBuzzApi.hb_font_funcs_is_immutable (Handle);

		public void MakeImmutable () => HarfBuzzApi.hb_font_funcs_make_immutable (Handle);

		public void SetHorizontalFontExtentsDelegate (FontExtentsDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_font_h_extents_func (
				Handle, DelegateProxies.FontExtentsProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetVerticalFontExtentsDelegate (FontExtentsDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_font_v_extents_func (
				Handle, DelegateProxies.FontExtentsProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetNominalGlyphDelegate (NominalGlyphDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_nominal_glyph_func (
				Handle, DelegateProxies.NominalGlyphProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetNominalGlyphsDelegate (NominalGlyphsDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_nominal_glyphs_func (
				Handle, DelegateProxies.NominalGlyphsProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetVariationGlyphDelegate (VariationGlyphDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_variation_glyph_func (
				Handle, DelegateProxies.VariationGlyphProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetHorizontalGlyphAdvanceDelegate (GlyphAdvanceDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_h_advance_func (
				Handle, DelegateProxies.GlyphAdvanceProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetVerticalGlyphAdvanceDelegate (GlyphAdvanceDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_v_advance_func (
				Handle, DelegateProxies.GlyphAdvanceProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetHorizontalGlyphAdvancesDelegate (GlyphAdvancesDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_h_advances_func (
				Handle, DelegateProxies.GlyphAdvancesProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetVerticalGlyphAdvancesDelegate (GlyphAdvancesDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_v_advances_func (
				Handle, DelegateProxies.GlyphAdvancesProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetHorizontalGlyphOriginDelegate (GlyphOriginDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_h_origin_func (
				Handle, DelegateProxies.GlyphOriginProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetVerticalGlyphOriginDelegate (GlyphOriginDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_v_origin_func (
				Handle, DelegateProxies.GlyphOriginProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetHorizontalGlyphKerningDelegate (GlyphKerningDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_h_kerning_func (
				Handle, DelegateProxies.GlyphKerningProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetGlyphExtentsDelegate (GlyphExtentsDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_extents_func (
				Handle, DelegateProxies.GlyphExtentsProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}
		public void SetGlyphContourPointDelegate (GlyphContourPointDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_contour_point_func (
				Handle, DelegateProxies.GlyphContourPointProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetGlyphNameDelegate (GlyphNameDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_name_func (
				Handle, DelegateProxies.GlyphNameProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		public void SetGlyphFromNameDelegate (GlyphFromNameDelegate del, ReleaseDelegate destroy = null)
		{
			VerifyParameters (del);

			var ctx = DelegateProxies.CreateMulti (del, destroy);

			HarfBuzzApi.hb_font_funcs_set_glyph_from_name_func (
				Handle, DelegateProxies.GlyphFromNameProxy, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
		}

		protected override void Dispose (bool disposing) =>
			base.Dispose (disposing);

		protected override void DisposeHandler ()
		{
			if (Handle != IntPtr.Zero) {
				HarfBuzzApi.hb_font_funcs_destroy (Handle);
			}
		}

		private void VerifyParameters (Delegate del)
		{
			_ = del ?? throw new ArgumentNullException (nameof (del));

			if (IsImmutable)
				throw new InvalidOperationException ($"{nameof (FontFunctions)} is immutable and can't be changed.");
		}

		private class StaticFontFunctions : FontFunctions
		{
			public StaticFontFunctions (IntPtr handle)
				: base (handle)
			{
			}

			protected override void Dispose (bool disposing)
			{
				// do not dispose
			}
		}
	}
}