// Create a display list coresponding to the give character.
// return character width
private int make_dlist(Face face, uint ch, uint list_base, uint[] tex_base)
{
int charWidth = 0;
//The first thing we do is get FreeType to render our character
//into a bitmap. This actually requires a couple of FreeType commands:
//Load the Glyph for our character.
face.LoadGlyph(face.GetCharIndex(ch), LoadFlags.Default, LoadTarget.Normal);
//Move the face's glyph into a Glyph object.
Glyph glyph = face.Glyph.GetGlyph();
//Convert the glyph to a bitmap.
glyph.ToBitmap(RenderMode.Normal, new FTVector26Dot6(0, 0), true);
BitmapGlyph bitmap_glyph = glyph.ToBitmapGlyph();
//This reference will make accessing the bitmap easier
FTBitmap bitmap = bitmap_glyph.Bitmap;
//Use our helper function to get the widths of
//the bitmap data that we will need in order to create
//our texture.
int width = next_p2(bitmap.Width);
int height = next_p2(bitmap.Rows);
//Allocate memory for the texture data.
byte[] expanded_data = new byte[2 * width * height];
//Here we fill in the data for the expanded bitmap.
//Notice that we are using two channel bitmap (one for
//luminocity and one for alpha), but we assign
//both luminocity and alpha to the value that we
//find in the FreeType bitmap.
//We use the ?: operator so that value which we use
//will be 0 if we are in the padding zone, and whatever
//is the the Freetype bitmap otherwise.
for (int j = 0; j < height; j++)
{
for (int i = 0; i < width; i++)
{
expanded_data[2 * (i + j * width)] = 255;
if (i >= bitmap.Width || j >= bitmap.Rows)
{
expanded_data[2 * (i + j * width) + 1] = 0;
}
else
{
expanded_data[2 * (i + j * width) + 1] = bitmap.BufferData[i + bitmap.Width * j];
}
}
}
//Now we just setup some texture paramaters.
glView.glBindTexture2D(tex_base[ch]);
glView.glTex2DParameterMinFilterLinear();
glView.glTex2DParameterMagFilterLinear();
//Here we actually create the texture itself, notice
//that we are using GL_LUMINANCE_ALPHA to indicate that
//we are using 2 channel data.
glView.glTexImage2D_IntFormatRGBA_formatLumAlpha_bytes(width, height, expanded_data);
//So now we can create the display list
glView.glNewListCompile(list_base + ch);
glView.glBindTexture2D(tex_base[ch]);
glView.glPushMatrix(); // better results with popping the matrix here..
//first we need to move over a little so that
//the character has the right amount of space
//between it and the one before it.
glView.glTranslate((float)bitmap_glyph.Left, 0f, 0f);
//Now we move down a little in the case that the
//bitmap extends past the bottom of the line
//(this is only true for characters like 'g' or 'y'.
//GL.PushMatrix(); // better results without popping the matrix before top translation
int topOffset = bitmap_glyph.Top - bitmap.Rows;
glView.glTranslate(0f, (float)topOffset, 0f);
//glTranslatef(0, (GLfloat)bitmap_glyph->top-bitmap.rows, 0);
//Now we need to account for the fact that many of
//our textures are filled with empty padding space.
//We figure what portion of the texture is used by
//the actual character and store that information in
//the x and y variables, then when we draw the
//quad, we will only reference the parts of the texture
//that we contain the character itself.
float x = (float)bitmap.Width / (float)width,
y = (float)bitmap.Rows / (float)height;
//Here we draw the texturemaped quads.
//The bitmap that we got from FreeType was not
//oriented quite like we would like it to be,
//so we need to link the texture to the quad
//so that the result will be properly aligned.
glView.glBeginQuads();
glView.glTexCoord2(0, 0); glView.glVertex2(0f, (float)bitmap.Rows);
glView.glTexCoord2(0, y); glView.glVertex2(0f, 0f);
glView.glTexCoord2(x, y); glView.glVertex2((float)bitmap.Width, 0);
glView.glTexCoord2(x, 0); glView.glVertex2((float)bitmap.Width, (float)bitmap.Rows);
glView.glEnd();
glView.glPopMatrix();
glView.glTranslate((float)(face.Glyph.Advance.X), 0f, 0f);
// set the char width
charWidth = (int)face.Glyph.Advance.X;
//Finish the display list
glView.glEndList();
// free the glyph memory (bugfix)
bitmap.Dispose();
bitmap_glyph.Dispose();
glyph.Dispose();
// return the character width
return(charWidth);
}
public unsafe GlyphInfo CompileCharacter(Face face, uint glyphindex, char character)
{
// Load or generate new Texture and store the Handle in m_Textures
if (m_Textures.Length <= Count)
{
Array.Resize(ref m_Textures, Math.Max(32, m_Textures.Length * 2));
}
int TextureIndex = m_Textures [Count];
if (TextureIndex == 0)
{
int[] textures = new int[1];
GL.GenTextures(1, textures);
if (textures [0] == 0)
{
return(GlyphInfo.Empty);
}
m_Textures [Count] = textures [0];
TextureIndex = textures [0];
}
int ListIndex = (int)glyphindex;
//if (m_ListBase == 0) {
if (OnDemand)
{
ListIndex = GL.GenLists(1);
if (ListIndex == 0)
{
return(GlyphInfo.Empty);
}
}
try {
face.LoadGlyph(glyphindex, LoadFlags.ForceAutohint, LoadTarget.Normal);
} catch (Exception ex) {
ex.LogWarning();
return(GlyphInfo.Empty);
}
Glyph glyph = face.Glyph.GetGlyph();
if (glyph == null)
{
return(GlyphInfo.Empty);
}
Height = Math.Max(Height, (float)face.Glyph.Metrics.Height);
//glyph.ToBitmap (SharpFont.RenderMode.Normal, new FTVector26Dot6(0.15, 0.15), true);
glyph.ToBitmap(SharpFont.RenderMode.Normal, new FTVector26Dot6(0, 0), true);
BitmapGlyph bmg = glyph.ToBitmapGlyph();
int width = bmg.Bitmap.Width;
int rows = bmg.Bitmap.Rows;
int size = width * rows;
if (size <= 0)
{
glyph.Dispose();
//if (Filter == GlyphFilterFlags.All)
// m_ExtentsX[(int)glyphindex] = 0;
int spaceWidth = 0;
if (character == 32)
{
Count++;
spaceWidth = (Size * ScaleFactor / 3f).Ceil();
GL.NewList(m_ListBase + ListIndex, ListMode.Compile); // evtl character
GL.Translate(spaceWidth, 0, 0);
GL.EndList();
return(new GlyphInfo(ListIndex, spaceWidth));
}
return(GlyphInfo.Empty);
}
Count++;
int expandedBitmapWidth = (width + 1).NextPowerOf2();
int expandedBitmapHeight = rows.NextPowerOf2();
byte[] expandedBitmapBytes = new byte[expandedBitmapWidth * expandedBitmapHeight];
fixed(byte *p = bmg.Bitmap.BufferData)
fixed(byte *q = expandedBitmapBytes)
{
try {
byte *pTemp = p;
for (int countY = 0; countY < expandedBitmapHeight; countY++)
{
for (int countX = 0; countX < expandedBitmapWidth; countX++)
{
byte *qTemp = q + (countX + countY * expandedBitmapWidth);
if ((countX >= width || countY >= rows))
{
*qTemp = 0;
}
else
{
*qTemp = *(pTemp + countX);
}
}
pTemp += width;
}
if (IsSpecialChar(character))
{
for (int i = 0; i < expandedBitmapBytes.Length; i++)
{
byte *qTemp = q + i;
* qTemp = (byte)(*qTemp / 2);
}
}
} catch (Exception ex) {
ex.LogError();
}
}
GL.BindTexture(TextureTarget.Texture2D, TextureIndex);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Clamp);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Clamp);
//GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexImage2D(TextureTarget.Texture2D,
0, // level-of-detail
PixelInternalFormat.Alpha, // texture-format 32bit
(int)expandedBitmapWidth, // texture-width
(int)expandedBitmapHeight, // texture-height
0, // border
PixelFormat.Alpha, // pixel-data-format
PixelType.UnsignedByte, // pixel-data-type
expandedBitmapBytes);
// ---------------------------------------------------------------------------
//Create a display list (of precompiled GL commands) and bind a texture to it.
GL.NewList(m_ListBase + ListIndex, ListMode.Compile);
GL.BindTexture(TextureTarget.Texture2D, TextureIndex);
// Account for freetype spacing rules.
float glyphWidth = (float)glyph.Advance.X;
//float left = (glyphWidth - bmg.Left) / 2f;
GL.Translate(bmg.Left, 0, 0);
GL.PushMatrix();
GL.Translate(0, bmg.Top - rows, 0);
float x = width / (float)expandedBitmapWidth;
float y = rows / (float)expandedBitmapHeight;
// Draw the quad.
GL.Begin(PrimitiveType.Quads);
GL.TexCoord2(0, 0); GL.Vertex2(0, rows);
GL.TexCoord2(0, y); GL.Vertex2(0, 0);
GL.TexCoord2(x, y); GL.Vertex2(width, 0);
GL.TexCoord2(x, 0); GL.Vertex2(width, rows);
GL.End();
GL.PopMatrix();
//GL.Translate (face.Glyph.Metrics.HorizontalAdvance - bmg.Left, 0, 0);
GL.Translate(glyphWidth - bmg.Left, 0, 0);
// Advance for the next character.
/***
* if (!Monospace)
* GL.Translate (face.Glyph.Metrics.HorizontalAdvance - bmg.Left, 0, 0);
* else
* GL.Translate (glyphWidth, 0, 0);
***/
GL.EndList();
// ---------------------------------------------------------------------------
//m_ExtentsX[glyphindex] = face.Glyph.Metrics.HorizontalAdvance.Ceiling();
//m_ExtentsX[ListIndex] = glyphWidth.Ceil();
glyph.Dispose();
return(new GlyphInfo(ListIndex, glyphWidth.Ceil()));
}
