kc3-lang/ftgl/src/FTTextureGlyph.cpp

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• Hash : 3a0d7bf5
  Author :
  Date : 2002-01-09T20:54:12
  

  Added a check for zero dimension bitmaps

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• src/FTTextureGlyph.cpp

• #include	"FTTextureGlyph.h"
  #ifdef FTGL_DEBUG
  	#include "mmgr.h"
  #endif
  
  
  FTTextureGlyph::FTTextureGlyph( FT_Glyph glyph, int id, int xOffset, int yOffset, GLsizei width, GLsizei height)
  :	FTGlyph(),
  	data(0),
  	destWidth(0),
  	destHeight(0),
  	numGreys(0),
  	glTextureID(id),
  	activeTextureID(0)
  {
  	// FIXME 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 || glyph->format != ft_glyph_format_bitmap)
  	{
  		return;
  	}
  
  	FT_BitmapGlyph  bitmap = ( FT_BitmapGlyph)glyph;
  	FT_Bitmap*      source = &bitmap->bitmap;
  
  	// FIXME check the pixel mode
  	//ft_pixel_mode_grays
  	    
  	int srcPitch = source->pitch;   
      destWidth = source->width;
      destHeight = source->rows;
      
      // Not sure what the standard behavior should be here?
      if( destWidth && destHeight)
      {
  	    data = new unsigned char[destWidth * destHeight];
  
  	    for(int y = 0; y < destHeight; ++y)
  	    {
  	    	for(int x = 0; x < destWidth; ++x)
  	    	{
  				*( data + ( y * destWidth  + x)) = *( source->buffer + ( y * srcPitch) + x);
  	    	}    	
  	    }
  
  		glBindTexture( GL_TEXTURE_2D, glTextureID);
  		glTexSubImage2D( GL_TEXTURE_2D, 0, xOffset, yOffset, destWidth, destHeight, GL_ALPHA, GL_UNSIGNED_BYTE, data);
  	}
  
  
  //		0    
  //		+----+
  //		|    |
  //		|    |
  //		|    |
  //		+----+
  //		     1
  	
  	// Texture co-ords
  	uv[0].x = static_cast<float>(xOffset) / static_cast<float>(width);
  	uv[0].y = static_cast<float>(yOffset) / static_cast<float>(height);
  	uv[1].x = static_cast<float>( xOffset + destWidth) / static_cast<float>(width);
  	uv[1].y = static_cast<float>( yOffset + destHeight) / static_cast<float>(height);
  	
  	numGreys = source->num_grays;
  	advance = glyph->advance.x >> 16;
  	bBox = FTBBox( glyph);
  
   	pos.x = bitmap->left;
  	pos.y = bitmap->top;
  	
  	if( data)
  		delete [] data;
  	
  // 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)
  {
  	glGetIntegerv( GL_TEXTURE_2D_BINDING_EXT, &activeTextureID);
  	if( activeTextureID != glTextureID)
  	{
  		glBindTexture( GL_TEXTURE_2D, (GLuint)glTextureID);
  	}
  	
  	glBegin( GL_QUADS);
  		glTexCoord2f( uv[0].x, uv[0].y);
  		glVertex2f( pen.x + pos.x,				pen.y + pos.y);
  
  		glTexCoord2f( uv[0].x, uv[1].y);
  		glVertex2f( pen.x + pos.x,				pen.y + pos.y - destHeight);
  
  		glTexCoord2f( uv[1].x, uv[1].y);
  		glVertex2f( pen.x + destWidth + pos.x,	pen.y + pos.y - destHeight);
  		
  		glTexCoord2f( uv[1].x, uv[0].y);
  		glVertex2f( pen.x + destWidth + pos.x,	pen.y + pos.y);
  	glEnd();
  
  	return advance;
  
  }
  
  

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