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private GetCharacterData ( string text, int offset, |
||
| text | string | The string containing the codepoint. |
| offset | int | The offset at which to read the codepoint. For surrogate pairs, two characters are read, and one otherwise. |
| texture | Receives the texture that contains the codepoint. | |
| data | OpenGlFontChar | Receives the data that describes the codepoint. |
| Résultat | int | |
// --- functions ---
/// <summary>Measures the size of a string as it would be rendered using the specified font.</summary>
/// <param name="font">The font to use.</param>
/// <param name="text">The string to render.</param>
/// <returns>The size of the string.</returns>
internal static Size MeasureString(Fonts.OpenGlFont font, string text)
{
int width = 0;
int height = 0;
if (text != null && font != null)
{
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
width += data.TypographicSize.Width;
if (data.TypographicSize.Height > height)
{
height = data.TypographicSize.Height;
}
}
}
return(new Size(width, height));
}
/// <summary>Renders a string to the screen.</summary>
/// <param name="font">The font to use.</param>
/// <param name="text">The string to render.</param>
/// <param name="location">The location.</param>
/// <param name="alignment">The alignment.</param>
/// <param name="color">The color.</param>
/// <remarks>This function sets the OpenGL blend function to glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE_MINUS_SRC_ALPHA).</remarks>
private static void DrawString(Fonts.OpenGlFont font, string text, Point location, TextAlignment alignment, Color128 color)
{
if (text == null || font == null)
{
return;
}
/*
* Prepare the top-left coordinates for rendering, incorporating the
* orientation of the string in relation to the specified location.
* */
int left;
if ((alignment & TextAlignment.Left) == 0)
{
int width = 0;
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
width += data.TypographicSize.Width;
}
if ((alignment & TextAlignment.Right) != 0)
{
left = location.X - width;
}
else
{
left = location.X - width / 2;
}
}
else
{
left = location.X;
}
int top;
if ((alignment & TextAlignment.Top) == 0)
{
int height = 0;
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
if (data.TypographicSize.Height > height)
{
height = data.TypographicSize.Height;
}
}
if ((alignment & TextAlignment.Bottom) != 0)
{
top = location.Y - height;
}
else
{
top = location.Y - height / 2;
}
}
else
{
top = location.Y;
}
/*
* Render the string.
* */
GL.Enable(EnableCap.Texture2D);
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
if (Textures.LoadTexture(texture, Textures.OpenGlTextureWrapMode.ClampClamp))
{
GL.BindTexture(TextureTarget.Texture2D, texture.OpenGlTextures[(int)Textures.OpenGlTextureWrapMode.ClampClamp].Name);
int x = left - (data.PhysicalSize.Width - data.TypographicSize.Width) / 2;
int y = top - (data.PhysicalSize.Height - data.TypographicSize.Height) / 2;
/*
* In the first pass, mask off the background with pure black.
* */
GL.BlendFunc(BlendingFactor.Zero, BlendingFactor.OneMinusSrcColor);
GL.Begin(PrimitiveType.Polygon);
GL.Color4(color.A, color.A, color.A, 1.0f);
GL.TexCoord2(data.TextureCoordinates.Left, data.TextureCoordinates.Top);
GL.Vertex2(x, y);
GL.Color4(color.A, color.A, color.A, 1.0f);
GL.TexCoord2(data.TextureCoordinates.Right, data.TextureCoordinates.Top);
GL.Vertex2(x + data.PhysicalSize.Width, y);
GL.Color4(color.A, color.A, color.A, 1.0f);
GL.TexCoord2(data.TextureCoordinates.Right, data.TextureCoordinates.Bottom);
GL.Vertex2(x + data.PhysicalSize.Width, y + data.PhysicalSize.Height);
GL.Color4(color.A, color.A, color.A, 1.0f);
GL.TexCoord2(data.TextureCoordinates.Left, data.TextureCoordinates.Bottom);
GL.Vertex2(x, y + data.PhysicalSize.Height);
GL.End();
/*
* In the second pass, add the character onto the background.
* */
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.One);
GL.Begin(PrimitiveType.Polygon);
GL.Color4(color.R, color.G, color.B, color.A);
GL.TexCoord2(data.TextureCoordinates.Left, data.TextureCoordinates.Top);
GL.Vertex2(x, y);
GL.Color4(color.R, color.G, color.B, color.A);
GL.TexCoord2(data.TextureCoordinates.Right, data.TextureCoordinates.Top);
GL.Vertex2(x + data.PhysicalSize.Width, y);
GL.Color4(color.R, color.G, color.B, color.A);
GL.TexCoord2(data.TextureCoordinates.Right, data.TextureCoordinates.Bottom);
GL.Vertex2(x + data.PhysicalSize.Width, y + data.PhysicalSize.Height);
GL.Color4(color.R, color.G, color.B, color.A);
GL.TexCoord2(data.TextureCoordinates.Left, data.TextureCoordinates.Bottom);
GL.Vertex2(x, y + data.PhysicalSize.Height);
GL.End();
}
left += data.TypographicSize.Width;
}
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha); // HACK //
GL.Disable(EnableCap.Texture2D);
}
/// <summary>Renders a string to the screen.</summary>
/// <param name="font">The font to use.</param>
/// <param name="text">The string to render.</param>
/// <param name="location">The location.</param>
/// <param name="orientation">The orientation.</param>
/// <param name="color">The color.</param>
/// <remarks>This function sets the OpenGL blend function to glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE_MINUS_SRC_ALPHA).</remarks>
private static void DrawString(Fonts.OpenGlFont font, string text, Point location, TextAlignment alignment, Color128 color)
{
if (text == null)
{
return;
}
/*
* Prepare the top-left coordinates for rendering, incorporating the
* orientation of the string in relation to the specified location.
* */
int left;
if ((alignment & TextAlignment.Left) == 0)
{
int width = 0;
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
width += data.TypographicSize.Width;
}
if ((alignment & TextAlignment.Right) != 0)
{
left = location.X - width;
}
else
{
left = location.X - width / 2;
}
}
else
{
left = location.X;
}
int top;
if ((alignment & TextAlignment.Top) == 0)
{
int height = 0;
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
if (data.TypographicSize.Height > height)
{
height = data.TypographicSize.Height;
}
}
if ((alignment & TextAlignment.Bottom) != 0)
{
top = location.Y - height;
}
else
{
top = location.Y - height / 2;
}
}
else
{
top = location.Y;
}
/*
* Render the string.
* */
Gl.glEnable(Gl.GL_TEXTURE_2D);
for (int i = 0; i < text.Length; i++)
{
Textures.Texture texture;
Fonts.OpenGlFontChar data;
i += font.GetCharacterData(text, i, out texture, out data) - 1;
if (Textures.LoadTexture(texture, Textures.OpenGlTextureWrapMode.ClampClamp))
{
Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture.OpenGlTextures[(int)Textures.OpenGlTextureWrapMode.ClampClamp].Name);
int x = left - (data.PhysicalSize.Width - data.TypographicSize.Width) / 2;
int y = top - (data.PhysicalSize.Height - data.TypographicSize.Height) / 2;
/*
* In the first pass, mask off the background with pure black.
* */
Gl.glBlendFunc(Gl.GL_ZERO, Gl.GL_ONE_MINUS_SRC_COLOR);
Gl.glBegin(Gl.GL_POLYGON);
Gl.glColor4f(color.A, color.A, color.A, 1.0f);
Gl.glTexCoord2f(data.TextureCoordinates.Left, data.TextureCoordinates.Top);
Gl.glVertex2f(x, y);
Gl.glColor4f(color.A, color.A, color.A, 1.0f);
Gl.glTexCoord2f(data.TextureCoordinates.Right, data.TextureCoordinates.Top);
Gl.glVertex2f(x + data.PhysicalSize.Width, y);
Gl.glColor4f(color.A, color.A, color.A, 1.0f);
Gl.glTexCoord2f(data.TextureCoordinates.Right, data.TextureCoordinates.Bottom);
Gl.glVertex2f(x + data.PhysicalSize.Width, y + data.PhysicalSize.Height);
Gl.glColor4f(color.A, color.A, color.A, 1.0f);
Gl.glTexCoord2f(data.TextureCoordinates.Left, data.TextureCoordinates.Bottom);
Gl.glVertex2f(x, y + data.PhysicalSize.Height);
Gl.glEnd();
/*
* In the second pass, add the character onto the background.
* */
Gl.glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE);
Gl.glBegin(Gl.GL_POLYGON);
Gl.glColor4f(color.R, color.G, color.B, color.A);
Gl.glTexCoord2f(data.TextureCoordinates.Left, data.TextureCoordinates.Top);
Gl.glVertex2f(x, y);
Gl.glColor4f(color.R, color.G, color.B, color.A);
Gl.glTexCoord2f(data.TextureCoordinates.Right, data.TextureCoordinates.Top);
Gl.glVertex2f(x + data.PhysicalSize.Width, y);
Gl.glColor4f(color.R, color.G, color.B, color.A);
Gl.glTexCoord2f(data.TextureCoordinates.Right, data.TextureCoordinates.Bottom);
Gl.glVertex2f(x + data.PhysicalSize.Width, y + data.PhysicalSize.Height);
Gl.glColor4f(color.R, color.G, color.B, color.A);
Gl.glTexCoord2f(data.TextureCoordinates.Left, data.TextureCoordinates.Bottom);
Gl.glVertex2f(x, y + data.PhysicalSize.Height);
Gl.glEnd();
}
left += data.TypographicSize.Width;
}
Gl.glBlendFunc(Gl.GL_SRC_ALPHA, Gl.GL_ONE_MINUS_SRC_ALPHA); // HACK //
}
