kc3-lang/ftgl/src/FTTextureGlyph.cpp

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• Hash : e3206aab
  Author :
  Date : 2001-08-22T22:58:09
  

  Fixed the positional stuff in render(). Added leftside bearing offset.

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• src/FTTextureGlyph.cpp

• #include	"GL/gl.h"
  
  #include	"FTTextureGlyph.h"
  #include	"FTGL.h"
  
  
  int FTTextureGlyph::activeTextureID = 0;
  
  FTTextureGlyph::FTTextureGlyph( FT_Glyph glyph, unsigned int gi, int id, unsigned char* data, int stride, int height, float u, float v)
  :	FTGlyph(gi),
  	destWidth(0),
  	destHeight(0),
  	numGreys(0),
  	glTextureID(id)
  {
  	if( !glyph->format == ft_glyph_format_bitmap)
  	{ return;}
  	
  	// This function will always fail if the glyph's format isn't scalable????
  	err = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_normal, 0, 1);
  	if( err)
  	{return;}
  
  	FT_BitmapGlyph  bitmap = ( FT_BitmapGlyph)glyph;
  	FT_Bitmap*      source = &bitmap->bitmap;
  
  	//check the pixel mode
  	//ft_pixel_mode_grays
  	    
  	int srcWidth = source->width;
  	int srcHeight = source->rows;
  	int srcPitch = source->pitch;
      
  	numGreys = source->num_grays;
  	advance = glyph->advance.x >> 16; // this is 6 in the freetype docs!!!!!!
  
   	pos.x = bitmap->left;
  	pos.y = bitmap->top;
  	
      destWidth = srcWidth;
      destHeight = srcHeight;
      
      for(int y = 0; y < srcHeight; ++y)
      {
      	for(int x = 0; x < srcWidth; ++x)
      	{
  			*( data + ( y * stride  + x)) = *( source->buffer + ( y * srcPitch) + x);
      	}    	
      }
  
  //		0    
  //		+----+
  //		|    |
  //		|    |
  //		|    |
  //		+----+
  //		     1
  	
  	uv[0].x = u;
  	uv[0].y = v;
  	uv[1].x = uv[0].x + ( (float)destWidth / (float)stride);
  	uv[1].y = uv[0].y + ( (float)destHeight / (float)height);
  
  	// discard glyph image (bitmap or not)
  	// Is this the right place to do this?
  	FT_Done_Glyph( glyph);
  }
  
  
  FTTextureGlyph::~FTTextureGlyph()
  {
  
  }
  
  
  float FTTextureGlyph::Render( const FT_Vector& pen)
  {
  	// This could be really ugly!!
  	if( activeTextureID != glTextureID)
  	{
  		glEnd();
  		glBindTexture( GL_TEXTURE_2D, (GLuint)glTextureID);
  		activeTextureID = glTextureID;
  		glBegin( GL_QUADS);
  	}
  	
  	glTexCoord2f( uv[0].x, uv[0].y); glVertex2f( pen.x + pos.x,				pen.y + pos.y);
  	glTexCoord2f( uv[1].x, uv[0].y); glVertex2f( pen.x + destWidth + pos.x,	pen.y + pos.y);
  	glTexCoord2f( uv[1].x, uv[1].y); glVertex2f( pen.x + destWidth + pos.x,	pen.y + pos.y - destHeight);
  	glTexCoord2f( uv[0].x, uv[1].y); glVertex2f( pen.x + pos.x,				pen.y + pos.y - destHeight);
  
  	return advance;
  }
  

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