mirror of https://github.com/ppy/osu
49 lines
1.8 KiB
C#
49 lines
1.8 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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#nullable disable
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using osu.Framework.Graphics;
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using osuTK.Graphics;
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namespace osu.Game.Skinning
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{
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/// <summary>
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/// Compatibility methods to apply osu!stable quirks to colours. Should be used for legacy skins only.
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/// </summary>
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public static class LegacyColourCompatibility
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{
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/// <summary>
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/// Forces an alpha of 1 if a given <see cref="Color4"/> is fully transparent.
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/// </summary>
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/// <remarks>
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/// This is equivalent to setting colour post-constructor in osu!stable.
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/// </remarks>
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/// <param name="colour">The <see cref="Color4"/> to disallow zero alpha on.</param>
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/// <returns>The resultant <see cref="Color4"/>.</returns>
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public static Color4 DisallowZeroAlpha(Color4 colour)
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{
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if (colour.A == 0)
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colour.A = 1;
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return colour;
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}
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/// <summary>
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/// Applies a <see cref="Color4"/> to a <see cref="Drawable"/>, doubling the alpha value into the <see cref="Drawable.Alpha"/> property.
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/// </summary>
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/// <remarks>
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/// This is equivalent to setting colour in the constructor in osu!stable.
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/// </remarks>
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/// <param name="drawable">The <see cref="Drawable"/> to apply the colour to.</param>
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/// <param name="colour">The <see cref="Color4"/> to apply.</param>
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/// <returns>The given <paramref name="drawable"/>.</returns>
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public static T ApplyWithDoubledAlpha<T>(T drawable, Color4 colour)
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where T : Drawable
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{
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drawable.Alpha = colour.A;
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drawable.Colour = DisallowZeroAlpha(colour);
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return drawable;
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}
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}
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}
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