NTERA/NTERA/Game/Display/StringMeasure.cs

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using MinorShift.Emuera;
using MinorShift._Library;

namespace NTERA.Game.Display
{

	/// <summary>
	/// テキスト長計測装置
	/// 1819 必要になるたびにCreateGraphicsする方式をやめてあらかじめGraphicsを用意しておくことにする
	/// </summary>
	public sealed class StringMeasure : IDisposable
	{
		public StringMeasure()
		{
			textDrawingMode = Config.TextDrawingMode;
			layoutSize = new Size(Config.WindowX * 2, Config.LineHeight);
			layoutRect = new RectangleF(0, 0, Config.WindowX * 2, Config.LineHeight);
			fontDisplaySize = Config.Font.Size / 2 * 1.04f;//実際には指定したフォントより若干幅をとる？
			//bmp = new Bitmap(Config.WindowX, Config.LineHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
			bmp = new Bitmap(16, 16, PixelFormat.Format32bppArgb);
			graph = Graphics.FromImage(bmp);
			if (textDrawingMode == TextDrawingMode.WINAPI)
				GDI.GdiMesureTextStart(graph);
		}

		readonly TextDrawingMode textDrawingMode;
		readonly StringFormat sf = new StringFormat(StringFormatFlags.MeasureTrailingSpaces);
		readonly CharacterRange[] ranges = { new CharacterRange(0, 1) };
		readonly Size layoutSize;
		readonly RectangleF layoutRect;
		readonly float fontDisplaySize;

		readonly Graphics graph;
		readonly Bitmap bmp;

		public int GetDisplayLength(string s, Font font)
		{
			if (string.IsNullOrEmpty(s))
				return 0;
			if (textDrawingMode == TextDrawingMode.GRAPHICS)
			{
				if (s.Contains("\t"))
					s = s.Replace("\t", "        ");
				ranges[0].Length = s.Length;
				//CharacterRange[] ranges = new CharacterRange[] { new CharacterRange(0, s.Length) };
				sf.SetMeasurableCharacterRanges(ranges);
				Region[] regions = graph.MeasureCharacterRanges(s, font, layoutRect, sf);
				RectangleF rectF = regions[0].GetBounds(graph);
				//return (int)rectF.Width;//プロポーショナルでなくても数ピクセルずれる
				return (int)((int)((rectF.Width - 1) / fontDisplaySize + 0.95f) * fontDisplaySize);
			}

			if (textDrawingMode == TextDrawingMode.TEXTRENDERER)
			{
				Size size = TextRenderer.MeasureText(graph, s, font, layoutSize, TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix);
				//Size size = TextRenderer.MeasureText(g, s, StaticConfig.Font);
				return size.Width;
			}
			else// if (StaticConfig.TextDrawingMode == TextDrawingMode.WINAPI)
			{
				Size size = GDI.MeasureText(s, font);
				return size.Width;
			}
			//来るわけがない
			//else
			//    throw new ExeEE("描画モード不明");
		}


		bool disposed;
		public void Dispose()
		{
			if (disposed)
				return;
			disposed = true;
			if (textDrawingMode == TextDrawingMode.WINAPI)
				GDI.GdiMesureTextEnd(graph);
			graph.Dispose();
			bmp.Dispose();
            sf.Dispose();
		}
	}
}