ossimFreeTypeFont.h

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//*******************************************************************
// Copyright (C) 2000 ImageLinks Inc. 
//
// License:  See top level LICENSE.txt file.
//
// Author: Garrett Potts
// 
//********************************************************************
// $Id: ossimFreeTypeFont.h 21749 2012-09-18 14:06:13Z dburken $
#ifndef ossimFreeTypeFont_HEADER
#define ossimFreeTypeFont_HEADER

#include <ossim/ossimConfig.h> /* To pick up OSSIM_HAS_FREETYPE. */

#if OSSIM_HAS_FREETYPE
#  include <ossim/font/ossimFont.h>
#  include <ft2build.h>
#  include FT_FREETYPE_H
//#include <freetype/freetype.h>
#  include FT_MODULE_H // for FT_Done_Library
#  include FT_GLYPH_H

#  include "ossim/base/ossimFilename.h"


typedef struct  TGlyph_
{
   FT_UInt    glyph_index;         /* glyph index in face      */
   FT_Vector  pos;                 /* position of glyph origin */
   FT_Glyph   image;               /* glyph image              */
   
} TGlyph, *PGlyph;

class ossimFreeTypeFont: public ossimFont
{
public:
   ossimFreeTypeFont(const ossimFilename& fontFile);
   ossimFreeTypeFont(const ossimFreeTypeFont& rhs);

   virtual ossimObject* dup()const
      {
         return new ossimFreeTypeFont(*this);
      }

   virtual const ossim_uint8* getBuf()const
      {
         return theOutputBuffer;
      }
   
   void layoutGlyphs(vector<TGlyph>& glyphs,
                     const ossimString& s );
   
   virtual const ossim_uint8* rasterize();
   void getBoundingBox(ossimIrect& box);

   long getNumberOfFaces()const
      {
         if(theFontFace)
         {
            return theFontFace->num_faces;
         }
         return 0;
      }
   void setCurrentFace(long index);

   bool isFixed()const
      {
         if(theFontFace)
         {
            return (theFontFace->num_fixed_sizes > 0);
         }
         return false;
      }
   
   virtual void getFixedSizes(vector<ossimIpt>& sizeArray)const;

   virtual void enableKerningSupport()
      {
         theKerningEnabledFlag = true;
         theBoundingRectIsValid = false;
      }

   virtual void disableKerningSupport()
      {
         theKerningEnabledFlag = false;
         theBoundingRectIsValid = false;
      }

   virtual void setHorizontalVerticalShear(double horizontalShear,
                                           double verticalShear)
      {
         ossimFont::setHorizontalVerticalShear(horizontalShear,
                                               verticalShear);
         theBoundingRectIsValid = false;
      }
   virtual void setScale(double horizontal,
                         double vertical)
      {
         ossimFont::setScale(horizontal,
                             vertical);
         theBoundingRectIsValid = false;
      }

   virtual void setPixelSize(int horizontalPixelSize,
                             int verticalPixelSize)
      {
         ossimFont::setPixelSize(horizontalPixelSize,
                                 verticalPixelSize);
         theBoundingRectIsValid = false;
      }
   virtual void setPixelSize(int pixelSize)
      {
         ossimFont::setPixelSize(pixelSize);
         theBoundingRectIsValid = false;         
      }
   
   virtual void setDeviceDpi(int horizontalDeviceUnits,
                             int verticalDeviceUnits)
      {
         ossimFont::setDeviceDpi(horizontalDeviceUnits,
                                 verticalDeviceUnits);
         theBoundingRectIsValid = false;
      }
   virtual void setString(const ossimString& s)
      {
         ossimFont::setString(s);
         theBoundingRectIsValid = false;
         theNeedToLayoutGlyphsFlag = true;
      }

  const FT_Face getFontFace()const
  {
    return theFontFace;
  }
protected:
   virtual ~ossimFreeTypeFont();

   FT_Face       theFontFace;
   FT_Library    theLibrary;
   FT_Matrix     theMatrix;
   
   ossimFilename theFontFile;

   ossim_uint8*  theOutputBuffer;
   long          theBufferSize;
   bool          theKerningEnabledFlag;
   bool          theNeedToLayoutGlyphsFlag;
   FT_Vector     theStringCenter;
   ossimIpt      theShift;
   vector<TGlyph> theStringLayout;
   
   mutable ossimIrect    thePrecomputedBoundingRect;


   mutable bool          theBoundingRectIsValid;
   void layoutGlyphs(const ossimString& s);
   
   void setBaseClassInformation();
   void setupForRasterization();
   void allocateBuffer();

   void drawBitmap(FT_Bitmap* bitmap,
                   const ossimIrect& bufRect,
                   const ossimIrect& glyphBox);

   void computeGlyphBox(FT_Glyph,
                        ossimIrect& box)const;
   void deleteGlyphs(vector<TGlyph>& glyphs);

TYPE_DATA
};

#endif

#endif