private float GetLineWidth(string text)
{
float result = 0f;
float scale = 1f / font.LineHeight;
for (int i = 0; i < text.Length; i++)
{
Character ch;
if (!font.Characters.TryGetValue(text[i], out ch))
{
continue;
}
result += ch.Advance * scale;
//kerning
if (i < text.Length - 1)
{
int first = text[i];
int second = text[i + 1];
CharsPair pair = new CharsPair((char)first, (char)second);
if (font.Kernings.TryGetValue(pair, out int amount))
{
result += amount * scale;
}
}
}
return(result);
}
private TextVertex[] GenSingleLineMesh(string text, float xOffset, float yOffset)
{
//init
int vertCount = text.Count(c => font.Characters.ContainsKey(c)) * 6;
TextVertex[] vertices = new TextVertex[vertCount];
float scale = 1f / font.LineHeight;
int spaceWidth = font.PaddingTop + font.PaddingBottom;
int offset = 0;
for (int i = 0; i < text.Length; i++)
{
if (text[i] == '\n' || text[i] == '\r')
{
throw new Exception("How did you even get here???");
}
Character ch;
if (!font.Characters.TryGetValue(text[i], out ch))
{
continue;
}
float xpos = xOffset + ch.Offset.X * scale;
float ypos = yOffset + ch.Offset.Y * scale;
float xmax = xpos + ch.Size.X * scale;
float ymax = ypos + ch.Size.Y * scale;
float xproper = xpos;
float yproper = -ypos + spaceWidth * scale + 0.5f;
float xmaxproper = xmax;
float ymaxproper = -ymax + spaceWidth * scale + 0.5f;
//set vertices
vertices[offset + 0] = new TextVertex(new Vector3(xmaxproper, ymaxproper, 0f), new Vector2(ch.End.X, ch.End.Y));
vertices[offset + 1] = new TextVertex(new Vector3(xmaxproper, yproper, 0f), new Vector2(ch.End.X, ch.Start.Y));
vertices[offset + 2] = new TextVertex(new Vector3(xproper, ymaxproper, 0f), new Vector2(ch.Start.X, ch.End.Y));
vertices[offset + 3] = new TextVertex(new Vector3(xmaxproper, yproper, 0f), new Vector2(ch.End.X, ch.Start.Y));
vertices[offset + 4] = new TextVertex(new Vector3(xproper, yproper, 0f), new Vector2(ch.Start.X, ch.Start.Y));
vertices[offset + 5] = new TextVertex(new Vector3(xproper, ymaxproper, 0f), new Vector2(ch.Start.X, ch.End.Y));
//update offset
offset += 6;
xOffset += ch.Advance * scale;
//kerning
if (i < text.Length - 1)
{
int first = text[i];
int second = text[i + 1];
CharsPair pair = new CharsPair((char)first, (char)second);
if (font.Kernings.TryGetValue(pair, out int amount))
{
xOffset += amount * scale;
}
}
}
return(vertices);
}
public Font(string name, string path) : base(name)
{
FntParser parser = new FntParser(path);
LineHeight = int.Parse(parser.RootNode["common"][0]["lineHeight"][0].Value);
string[] paddings = parser.RootNode["info"][0]["padding"][0].Value.Split(',');
PaddingTop = int.Parse(paddings[0]);
PaddingLeft = int.Parse(paddings[1]);
PaddingBottom = int.Parse(paddings[2]);
PaddingRight = int.Parse(paddings[3]);
TextureWidth = int.Parse(parser.RootNode["common"][0]["scaleW"][0].Value);
TextureHeight = int.Parse(parser.RootNode["common"][0]["scaleH"][0].Value);
int kerningsCount = int.Parse(parser.RootNode["kernings"][0]["count"][0].Value);
for (int i = 0; i < kerningsCount; i++)
{
FntNode node = parser.RootNode["kerning"][i];
CharsPair pair = new CharsPair(
(char)int.Parse(node["first"][0].Value),
(char)int.Parse(node["second"][0].Value));
Kernings.Add(pair, int.Parse(node["amount"][0].Value));
}
int charsCount = int.Parse(parser.RootNode["chars"][0]["count"][0].Value);
for (int i = 0; i < charsCount; i++)
{
FntNode node = parser.RootNode["char"][i];
char c = (char)int.Parse(node["id"][0].Value);
Vector2i size = new Vector2i(
int.Parse(node["width"][0].Value),
int.Parse(node["height"][0].Value));
Vector2i offset = new Vector2i(
int.Parse(node["xoffset"][0].Value),
int.Parse(node["yoffset"][0].Value));
Vector2i start = new Vector2i(
int.Parse(node["x"][0].Value),
int.Parse(node["y"][0].Value));
Vector2i end = start + size;
Characters.Add(c, new Character
{
Start = new Vector2(start.X / (float)TextureWidth, start.Y / (float)TextureHeight),
End = new Vector2(end.X / (float)TextureWidth, end.Y / (float)TextureHeight),
Size = size,
Offset = offset,
Advance = int.Parse(node["xadvance"][0].Value) - PaddingLeft - PaddingRight
});
}
string texPath = Path.Combine(Path.GetDirectoryName(path), parser.RootNode["page"][0]["file"][0].Value);
Rgba32[] pixels = Helper.LoadImageFromFile(texPath, out _, out _);
FontTexture = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, FontTexture);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, TextureWidth, TextureHeight, 0, PixelFormat.Rgba, PixelType.UnsignedByte, pixels);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.BindTexture(TextureTarget.Texture2D, 0);
}
