GlyphCropper.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
//
// Copyright (c) 2010-2013 SharpDX - Alexandre Mutel
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// The following code is a port of MakeSpriteFont from DirectXTk
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using System.Drawing;

namespace SiliconStudio.Paradox.Assets.SpriteFont.Compiler
{
    // Crops unused space from around the edge of a glyph bitmap.
    internal static class GlyphCropper
    {
        public static void Crop(Glyph glyph)
        {
            // Crop the top.
            while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Y, glyph.Subrect.Width, 1)))
            {
                glyph.Subrect.Y++;
                glyph.Subrect.Height--;

                glyph.YOffset++;
            }

            // Crop the bottom.
            while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Bottom - 1, glyph.Subrect.Width, 1)))
            {
                glyph.Subrect.Height--;
            }

            // Crop the left.
            while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
            {
                glyph.Subrect.X++;
                glyph.Subrect.Width--;

                glyph.XOffset++;
            }

            // Crop the right.
            while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.Right - 1, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
            {
                glyph.Subrect.Width--;
            }
        }
    }
}