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Optimized the LoadGlyph function. Reduced generated garbage.

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This commit is contained in:
the_fiddler 2007-11-08 15:54:38 +00:00
parent ab757425f3
commit 7345c28f09
1 changed files with 64 additions and 43 deletions
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107
Source/OpenTK/Fonts/TextureFont.cs
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@ -16,6 +16,8 @@ using OpenTK.OpenGL.Enums;
using System.Drawing.Imaging;
using OpenTK.Platform;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace OpenTK.Fonts
{
@ -26,10 +28,14 @@ namespace OpenTK.Fonts
Bitmap bmp;
Graphics gfx;
// TODO: We need to be able to use multiple font sheets.
static int texture;
static TexturePacker<Glyph> pack;
static int texture_width, texture_height;
float[] viewport = new float[6];
int[] data = new int[256]; // Used to upload glyph data to the OpenGL texture.
object upload_lock = new object();
#region --- Constructor ---
@ -37,7 +43,7 @@ namespace OpenTK.Fonts
/// Constructs a new TextureFont object, using the specified System.Drawing.Font.
/// </summary>
/// <param name="font">The System.Drawing.Font to use.</param>
public TextureFont(System.Drawing.Font font)
public TextureFont(Font font)
{
if (font == null)
throw new ArgumentNullException("font", "Argument to TextureFont constructor cannot be null.");
@ -46,6 +52,19 @@ namespace OpenTK.Fonts
bmp = new Bitmap(font.Height * 2, font.Height * 2);
gfx = Graphics.FromImage(bmp);
// Adjust font rendering mode. Small sizes look blurry without gridfitting, so turn
// that on. Increasing contrast also seems to help.
if (font.Size <= 18.0f)
{
gfx.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
gfx.TextContrast = 1;
}
else
{
gfx.TextRenderingHint = TextRenderingHint.AntiAlias;
gfx.TextContrast = 0;
}
}
#endregion
@ -127,59 +146,61 @@ namespace OpenTK.Fonts
PrepareTexturePacker();
Glyph g = new Glyph(c, font);
System.Drawing.Rectangle rect = pack.Add(g);
Rectangle rect = new Rectangle();
//using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(rect.Width, rect.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
//using (System.Drawing.Graphics gfx = System.Drawing.Graphics.FromImage(bmp))
try
{
GL.BindTexture(TextureTarget.Texture2d, texture);
pack.Add(g, out rect);
}
catch (InvalidOperationException expt)
{
// TODO: The TexturePacker is full, create a new font sheet.
Trace.WriteLine(expt);
throw;
}
// Set font rendering mode. Smal sizes look blurry without gridfitting, so turn
// that on. Increasing contrast also seems to help.
if (font.Size <= 18.0f)
{
gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
gfx.TextContrast = 1;
}
else
{
gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
gfx.TextContrast = 0;
}
gfx.Clear(System.Drawing.Color.Transparent);
gfx.DrawString(g.Character.ToString(), g.Font, System.Drawing.Brushes.White, 0.0f, 0.0f);
/*
BitmapData bmp_data = bmp.LockBits(new System.Drawing.Rectangle(0, 0, rect.Width, rect.Height), ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexSubImage2D(TextureTarget.Texture2d, 0, rect.Left, rect.Top, rect.Width, rect.Height,
OpenTK.OpenGL.Enums.PixelFormat.Rgba, PixelType.UnsignedByte, bmp_data.Scan0);
bmp.UnlockBits(bmp_data);
*/
GL.BindTexture(TextureTarget.Texture2d, texture);
int[] data = new int[rect.Width * rect.Height];
gfx.Clear(System.Drawing.Color.Transparent);
gfx.DrawString(g.Character.ToString(), g.Font, System.Drawing.Brushes.White, 0.0f, 0.0f);
//BitmapData bitmap_data = bitmap.LockBits(new Rectangle(0, 0, rect.Width, rect.Height), ImageLockMode.ReadOnly,
// System.Drawing.Imaging.PixelFormat.Format32bppArgb);
//GL.TexSubImage2D(TextureTarget.Texture2d, 0, rect.Left, rect.Top, rect.Width, rect.Height,
// OpenTK.OpenGL.Enums.PixelFormat.Rgba, PixelType.UnsignedByte, bitmap_data.Scan0);
//bitmap.UnlockBits(bitmap_data);
BitmapData bitmap_data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
int needed_size = rect.Width * rect.Height;
if (data.Length < needed_size)
Array.Resize<int>(ref data, needed_size);
Array.Clear(data, 0, needed_size);
unsafe
{
int* bitmap_data_ptr = (int*)bitmap_data.Scan0;
for (int y = 0; y < rect.Height; y++)
{
for (int x = 0; x < rect.Width; x++)
{
data[y * rect.Width + x] = bmp.GetPixel(x, y).ToArgb();
data[y * rect.Width + x] = *(bitmap_data_ptr + y * bmp.Width + x);
}
}
unsafe
{
fixed (int* ptr = data)
GL.TexSubImage2D(TextureTarget.Texture2d, 0, rect.Left, rect.Top, rect.Width, rect.Height,
OpenTK.OpenGL.Enums.PixelFormat.Rgba, PixelType.UnsignedByte, (IntPtr)ptr);
}
rectangle = new Box2(
rect.Left / (float)texture_width,
rect.Top / (float)texture_height,
rect.Right / (float)texture_width,
rect.Bottom / (float)texture_height);
loaded_glyphs.Add(g.Character, rectangle);
fixed (int* data_ptr = data)
GL.TexSubImage2D(TextureTarget.Texture2d, 0, rect.Left, rect.Top, rect.Width, rect.Height,
OpenTK.OpenGL.Enums.PixelFormat.Rgba, PixelType.UnsignedByte, (IntPtr)data_ptr);
}
bmp.UnlockBits(bitmap_data);
rectangle = new Box2(
rect.Left / (float)texture_width,
rect.Top / (float)texture_height,
rect.Right / (float)texture_width,
rect.Bottom / (float)texture_height);
loaded_glyphs.Add(g.Character, rectangle);
}
#endregion