560 lines
22 KiB
C#
560 lines
22 KiB
C#
#region --- License ---
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/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
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* See license.txt for license info
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Drawing.Text;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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using System.Diagnostics;
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using OpenTK.Math;
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using OpenTK.Graphics;
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using OpenTK.Platform;
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namespace OpenTK.Graphics
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{
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using Graphics = System.Drawing.Graphics;
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using PixelFormat = OpenTK.Graphics.PixelFormat;
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using System.Text.RegularExpressions;
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public class TextureFont : IFont
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{
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Font font;
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Dictionary<char, RectangleF> loaded_glyphs = new Dictionary<char, RectangleF>(64);
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Bitmap bmp;
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Graphics gfx;
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// TODO: We need to be able to use multiple font sheets.
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static int texture;
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static TexturePacker<Glyph> pack;
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static int texture_width, texture_height;
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static readonly StringFormat default_string_format = StringFormat.GenericTypographic; // Check the constructor, too, for additional flags.
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static readonly StringFormat load_glyph_string_format = StringFormat.GenericDefault;
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static SizeF maximum_graphics_size;
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int[] data = new int[256]; // Used to upload the glyph buffer to the OpenGL texture.
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object upload_lock = new object();
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static readonly char[] newline_characters = new char[] { '\n', '\r' };
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#region --- Constructor ---
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/// <summary>
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/// Constructs a new TextureFont, using the specified System.Drawing.Font.
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/// </summary>
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/// <param name="font">The System.Drawing.Font to use.</param>
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public TextureFont(Font font)
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{
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if (font == null)
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throw new ArgumentNullException("font", "Argument to TextureFont constructor cannot be null.");
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this.font = font;
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bmp = new Bitmap(font.Height * 2, font.Height * 2);
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gfx = Graphics.FromImage(bmp);
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maximum_graphics_size = gfx.ClipBounds.Size;
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// Adjust font rendering mode. Small sizes look blurry without gridfitting, so turn
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// that on. Increasing contrast also seems to help.
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if (font.Size <= 18.0f)
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{
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gfx.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
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//gfx.TextContrast = 11;
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}
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else
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{
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gfx.TextRenderingHint = TextRenderingHint.AntiAlias;
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//gfx.TextContrast = 0;
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}
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default_string_format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
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}
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/// <summary>
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/// Constructs a new TextureFont, using the specified parameters.
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/// </summary>
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/// <param name="font">The System.Drawing.FontFamily to use for the typeface.</param>
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/// <param name="emSize">The em size to use for the typeface.</param>
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public TextureFont(FontFamily family, float emSize)
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: this(new Font(family, emSize))
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{ }
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/// <summary>
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/// Constructs a new TextureFont, using the specified parameters.
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/// </summary>
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/// <param name="font">The System.Drawing.FontFamily to use for the typeface.</param>
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/// <param name="emSize">The em size to use for the typeface.</param>
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/// <param name="family">The style to use for the typeface.</param>
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public TextureFont(FontFamily family, float emSize, FontStyle style)
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: this(new Font(family, emSize, style))
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{ }
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#endregion
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#region --- Public Methods ---
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#region public void LoadGlyphs(string glyphs)
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/// <summary>
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/// Prepares the specified glyphs for rendering.
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/// </summary>
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/// <param name="glyphs">The glyphs to prepare for rendering.</param>
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public void LoadGlyphs(string glyphs)
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{
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RectangleF rect = new RectangleF();
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foreach (char c in glyphs)
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{
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if (Char.IsWhiteSpace(c))
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continue;
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try
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{
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if (!loaded_glyphs.ContainsKey(c))
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LoadGlyph(c, out rect);
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}
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catch (Exception e)
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{
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Debug.Print(e.ToString());
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throw;
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}
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}
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}
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#endregion
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#region public void LoadGlyph(char glyph)
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/// <summary>
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/// Prepares the specified glyph for rendering.
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/// </summary>
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/// <param name="glyphs">The glyph to prepare for rendering.</param>
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public void LoadGlyph(char glyph)
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{
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RectangleF rect = new RectangleF();
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if (!loaded_glyphs.ContainsKey(glyph))
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LoadGlyph(glyph, out rect);
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}
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#endregion
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#region public bool GlyphData(char glyph, out float width, out float height, out RectangleF textureRectangle, out int texture)
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/// <summary>
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/// Returns the characteristics of a loaded glyph.
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/// </summary>
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/// <param name="glyph">The character corresponding to this glyph.</param>
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/// <param name="width">The width of this glyph.</param>
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/// <param name="height">The height of this glyph (line spacing).</param>
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/// <param name="textureRectangle">The bounding box of the texture buffer of this glyph.</param>
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/// <param name="texture">The handle to the texture that contains this glyph.</param>
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/// <returns>True if the glyph has been loaded, false otherwise.</returns>
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/// <seealso cref="LoadGlyphs"/>
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public bool GlyphData(char glyph, out float width, out float height, out RectangleF textureRectangle, out int texture)
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{
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if (loaded_glyphs.TryGetValue(glyph, out textureRectangle))
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{
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width = textureRectangle.Width * texture_width;
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height = textureRectangle.Height * texture_height;
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texture = TextureFont.texture;
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return true;
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}
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width = height = texture = 0;
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return false;
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}
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#endregion
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#region public float Height
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/// <summary>
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/// Gets a float indicating the default line spacing of this font.
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/// </summary>
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public float Height
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{
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get { return font.Height; }
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}
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#endregion
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#region public float Width
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/// <summary>
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/// Gets a float indicating the default size of this font, in points.
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/// </summary>
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public float Width
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{
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get { return font.SizeInPoints; }
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}
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#endregion
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#region public void MeasureString(string str, out float width, out float height, bool accountForOverhangs)
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/// <summary>
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/// Measures the width of the specified string.
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/// </summary>
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/// <param name="str">The string to measure.</param>
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/// <param name="width">The measured width.</param>
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/// <param name="height">The measured height.</param>
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/// <param name="accountForOverhangs">If true, adds space to account for glyph overhangs. Set to true if you wish to measure a complete string. Set to false if you wish to perform layout on adjacent strings.</param>
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[Obsolete("Returns invalid results - use MeasureText() instead")]
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public void MeasureString(string str, out float width, out float height, bool accountForOverhangs)
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{
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System.Drawing.StringFormat format = accountForOverhangs ? System.Drawing.StringFormat.GenericDefault : System.Drawing.StringFormat.GenericTypographic;
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System.Drawing.SizeF size = gfx.MeasureString(str, font, 16384, format);
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height = size.Height;
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width = size.Width;
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}
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#endregion
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#region public void MeasureString(string str, out float width, out float height)
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/// <summary>
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/// Measures the width of the specified string.
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/// </summary>
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/// <param name="str">The string to measure.</param>
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/// <param name="width">The measured width.</param>
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/// <param name="height">The measured height.</param>
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/// <seealso cref="public void MeasureString(string str, out float width, out float height, bool accountForOverhangs)"/>
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[Obsolete("Returns invalid results - use MeasureText() instead")]
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public void MeasureString(string str, out float width, out float height)
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{
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MeasureString(str, out width, out height, true);
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}
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#endregion
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#region public RectangleF MeasureText(string text)
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/// <summary>
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/// Calculates size information for the specified text.
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/// </summary>
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/// <param name="text">The string to measure.</param>
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/// <returns>A RectangleF containing the bounding box for the specified text.</returns>
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public RectangleF MeasureText(string text)
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{
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return MeasureText(text, SizeF.Empty, default_string_format, null);
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}
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#endregion
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#region public RectangleF MeasureText(string text, SizeF bounds)
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/// <summary>
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/// Calculates size information for the specified text.
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/// </summary>
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/// <param name="text">The string to measure.</param>
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/// <param name="bounds">A SizeF structure containing the maximum desired width and height of the text. Default is SizeF.Empty.</param>
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/// <returns>A RectangleF containing the bounding box for the specified text.</returns>
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public RectangleF MeasureText(string text, SizeF bounds)
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{
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return MeasureText(text, bounds, default_string_format, null);
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}
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#endregion
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#region public RectangleF MeasureText(string text, SizeF bounds, StringFormat format)
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/// <summary>
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/// Calculates size information for the specified text.
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/// </summary>
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/// <param name="text">The string to measure.</param>
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/// <param name="bounds">A SizeF structure containing the maximum desired width and height of the text. Pass SizeF.Empty to disable wrapping calculations. A width or height of 0 disables the relevant calculation.</param>
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/// <param name="format">A StringFormat object which specifies the measurement format of the string. Pass null to use the default StringFormat (StringFormat.GenericTypographic).</param>
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/// <returns>A RectangleF containing the bounding box for the specified text.</returns>
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public RectangleF MeasureText(string text, SizeF bounds, StringFormat format)
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{
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return MeasureText(text, bounds, format, null);
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}
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#endregion
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#region public RectangleF MeasureText(string text, SizeF bounds, StringFormat format, IList<RectangleF> ranges)
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IntPtr[] regions = new IntPtr[GdiPlus.MaxMeasurableCharacterRanges];
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CharacterRange[] characterRanges = new CharacterRange[GdiPlus.MaxMeasurableCharacterRanges];
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/// <summary>
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/// Calculates size information for the specified text.
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/// </summary>
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/// <param name="text">The string to measure.</param>
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/// <param name="bounds">A SizeF structure containing the maximum desired width and height of the text. Pass SizeF.Empty to disable wrapping calculations. A width or height of 0 disables the relevant calculation.</param>
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/// <param name="format">A StringFormat object which specifies the measurement format of the string. Pass null to use the default StringFormat (StringFormat.GenericDefault).</param>
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/// <param name="ranges">Fills the specified IList of RectangleF structures with position information for individual characters. If this argument is null, these calculations are skipped.</param>
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/// <returns>A RectangleF containing the bounding box for the specified text.</returns>
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public RectangleF MeasureText(string text, SizeF bounds, StringFormat format, List<RectangleF> ranges)
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{
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if (String.IsNullOrEmpty(text))
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return RectangleF.Empty;
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if (bounds == SizeF.Empty)
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bounds = maximum_graphics_size;
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if (format == null)
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format = default_string_format;
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// TODO: What should we do in this case?
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if (ranges == null)
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ranges = new List<RectangleF>();
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ranges.Clear();
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PointF origin = PointF.Empty;
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SizeF size = SizeF.Empty;
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IntPtr native_graphics = GdiPlus.GetNativeGraphics(gfx);
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IntPtr native_font = GdiPlus.GetNativeFont(font);
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IntPtr native_string_format = GdiPlus.GetNativeStringFormat(format);
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RectangleF layoutRect = new RectangleF(PointF.Empty, bounds);
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int height = 0;
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// It seems that the mere presence of \n and \r characters
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// is enough for Mono to botch the layout (even if these
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// characters are not processed.) We'll need to find a
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// different way to perform layout on Mono, probably
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// through Pango.
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// Todo: This workaround allocates memory.
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//if (Configuration.RunningOnMono)
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{
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string[] lines = text.Replace("\r", String.Empty).Split(newline_characters);
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foreach (string s in lines)
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{
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ranges.AddRange(GetCharExtents(
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s, height, 0, s.Length, layoutRect,
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native_graphics, native_font, native_string_format));
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height += font.Height;
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}
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}
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return new RectangleF(ranges[0].X, ranges[0].Y, ranges[ranges.Count - 1].Right, ranges[ranges.Count - 1].Bottom);
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}
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#endregion
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#endregion
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#region --- Private Methods ---
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#region private void PrepareTexturePacker()
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/// <summary>
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/// Calculates the optimal size for the font texture and TexturePacker, and creates both.
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/// </summary>
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private void PrepareTexturePacker()
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{
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// Calculate the size of the texture packer. We want a power-of-two size
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// that is less than 1024 (supported in Geforce256-era cards), but large
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// enough to hold at least 256 (16*16) font glyphs.
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// TODO: Find the actual card limits, maybe?
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int size = (int)(font.Size * 16);
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size = (int)System.Math.Pow(2.0, System.Math.Ceiling(System.Math.Log((double)size, 2.0)));
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if (size > 1024)
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size = 1024;
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texture_width = size;
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texture_height = size;
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pack = new TexturePacker<Glyph>(texture_width, texture_height);
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GL.GenTextures(1, out texture);
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GL.BindTexture(TextureTarget.Texture2D, texture);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
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if (GL.SupportsExtension("Version12"))
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{
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
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}
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else
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{
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Clamp);
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GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Clamp);
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}
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GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Alpha, texture_width, texture_height, 0,
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OpenTK.Graphics.PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
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}
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#endregion
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#region private void LoadGlyph(char c, out RectangleF rectangle)
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// Adds the specified caharacter to the texture packer.
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private void LoadGlyph(char c, out RectangleF rectangle)
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{
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if (pack == null)
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PrepareTexturePacker();
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RectangleF glyph_rect = MeasureText(c.ToString(), SizeF.Empty, load_glyph_string_format);
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SizeF glyph_size = new SizeF(glyph_rect.Right, glyph_rect.Bottom); // We need to do this, since the origin might not be (0, 0)
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Glyph g = new Glyph(c, font, glyph_size);
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Rectangle rect;
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try
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{
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pack.Add(g, out rect);
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}
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catch (InvalidOperationException expt)
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{
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// TODO: The TexturePacker is full, create a new font sheet.
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Trace.WriteLine(expt);
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throw;
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}
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GL.BindTexture(TextureTarget.Texture2D, texture);
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gfx.Clear(System.Drawing.Color.Transparent);
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gfx.DrawString(g.Character.ToString(), g.Font, System.Drawing.Brushes.White, 0.0f, 0.0f, default_string_format);
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BitmapData bitmap_data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly,
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System.Drawing.Imaging.PixelFormat.Format32bppArgb);
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GL.PushClientAttrib(ClientAttribMask.ClientPixelStoreBit);
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try
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{
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GL.PixelStore(PixelStoreParameter.UnpackAlignment, 1.0f);
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GL.PixelStore(PixelStoreParameter.UnpackRowLength, bmp.Width);
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GL.TexSubImage2D(TextureTarget.Texture2D, 0, (int)rect.Left, (int)rect.Top,
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rect.Width, rect.Height,
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OpenTK.Graphics.PixelFormat.Rgba,
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PixelType.UnsignedByte, bitmap_data.Scan0);
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}
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finally
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{
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GL.PopClientAttrib();
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}
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bmp.UnlockBits(bitmap_data);
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rectangle = RectangleF.FromLTRB(
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rect.Left / (float)texture_width,
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rect.Top / (float)texture_height,
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rect.Right / (float)texture_width,
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rect.Bottom / (float)texture_height);
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loaded_glyphs.Add(g.Character, rectangle);
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}
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#endregion
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#region GetCharExtents
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// Gets the bounds of each character in a line of text.
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// The line is processed in blocks of 32 characters (GdiPlus.MaxMeasurableCharacterRanges).
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IEnumerable<RectangleF> GetCharExtents(string text, int height, int line_start, int line_length,
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RectangleF layoutRect, IntPtr native_graphics, IntPtr native_font, IntPtr native_string_format)
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{
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RectangleF rect = new RectangleF();
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int line_end = line_start + line_length;
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while (line_start < line_end)
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{
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//if (text[line_start] == '\n' || text[line_start] == '\r')
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//{
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// line_start++;
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// continue;
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//}
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int num_characters = (line_end - line_start) > GdiPlus.MaxMeasurableCharacterRanges ?
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GdiPlus.MaxMeasurableCharacterRanges :
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line_end - line_start;
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int status = 0;
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for (int i = 0; i < num_characters; i++)
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{
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characterRanges[i] = new CharacterRange(line_start + i, 1);
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IntPtr region;
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status = GdiPlus.CreateRegion(out region);
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regions[i] = region;
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Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
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}
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status = GdiPlus.SetStringFormatMeasurableCharacterRanges(native_string_format, num_characters, characterRanges);
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Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
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status = GdiPlus.MeasureCharacterRanges(native_graphics, text, text.Length,
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native_font, ref layoutRect, native_string_format, num_characters, regions);
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Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
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for (int i = 0; i < num_characters; i++)
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{
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GdiPlus.GetRegionBounds(regions[i], native_graphics, ref rect);
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Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
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GdiPlus.DeleteRegion(regions[i]);
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Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
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rect.Y += height;
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yield return rect;
|
|
}
|
|
|
|
line_start += num_characters;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion
|
|
|
|
#region --- Internal Methods ---
|
|
|
|
#region internal int Texture
|
|
|
|
/// <summary>
|
|
/// Gets the handle to the texture were this font resides.
|
|
/// </summary>
|
|
internal int Texture
|
|
{
|
|
get { return TextureFont.texture; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#endregion
|
|
|
|
#region --- IDisposable Members ---
|
|
|
|
bool disposed;
|
|
|
|
/// <summary>
|
|
/// Releases all resources used by this OpenTK.Graphics.TextureFont.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
GC.SuppressFinalize(this);
|
|
Dispose(true);
|
|
}
|
|
|
|
private void Dispose(bool manual)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
pack = null;
|
|
if (manual)
|
|
{
|
|
GL.DeleteTextures(1, ref texture);
|
|
font.Dispose();
|
|
gfx.Dispose();
|
|
}
|
|
|
|
disposed = true;
|
|
}
|
|
}
|
|
|
|
~TextureFont()
|
|
{
|
|
Dispose(false);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|