dox/Rendering/vtkFreeTypeTools.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkFreeTypeTools.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef __vtkFreeTypeTools_h
#define __vtkFreeTypeTools_h

#include "vtkObject.h"

class vtkImageData;
class vtkTextProperty;
class vtkStdString;
class vtkUnicodeString;

// FreeType
#include "vtk_freetype.h"  //since ft2build.h could be in the path
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include FT_CACHE_H

class FTFont;

//----------------------------------------------------------------------------
// Singleton cleanup
class VTK_RENDERING_EXPORT vtkFreeTypeToolsCleanup
{
public:
  vtkFreeTypeToolsCleanup();
  ~vtkFreeTypeToolsCleanup();
};

//----------------------------------------------------------------------------
// Singleton font cache
class VTK_RENDERING_EXPORT vtkFreeTypeTools : public vtkObject
{
public:
  vtkTypeMacro(vtkFreeTypeTools, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkFreeTypeTools* GetInstance();

  static void SetInstance(vtkFreeTypeTools *instance);

  FT_Library* GetLibrary();


  vtkSetClampMacro(MaximumNumberOfFaces,unsigned int,1,VTK_UNSIGNED_INT_MAX);
  vtkGetMacro(MaximumNumberOfFaces, unsigned int);
  vtkSetClampMacro(MaximumNumberOfSizes,unsigned int,1,VTK_UNSIGNED_INT_MAX);
  vtkGetMacro(MaximumNumberOfSizes, unsigned int);
  vtkSetClampMacro(MaximumNumberOfBytes,unsigned long,1,VTK_UNSIGNED_LONG_MAX);
  vtkGetMacro(MaximumNumberOfBytes, unsigned long);


  bool GetBoundingBox(vtkTextProperty *tprop, const vtkStdString& str,
                      int bbox[4]);
  bool GetBoundingBox(vtkTextProperty *tprop, const vtkUnicodeString& str,
                      int bbox[4]);
  bool IsBoundingBoxValid(int bbox[4]);


  bool RenderString(vtkTextProperty *tprop, const vtkStdString& str,
                    vtkImageData *data);
  bool RenderString(vtkTextProperty *tprop, const vtkUnicodeString& str,
                    vtkImageData *data);


  void MapTextPropertyToId(vtkTextProperty *tprop, unsigned long *tprop_cache_id);
  void MapIdToTextProperty(unsigned long tprop_cache_id, vtkTextProperty *tprop);


  vtkSetMacro(ScaleToPowerTwo, bool);
  vtkGetMacro(ScaleToPowerTwo, bool);
  vtkBooleanMacro(ScaleToPowerTwo, bool);

protected:

  template <typename T>
  bool CalculateBoundingBox(vtkTextProperty *tprop, const T& str, int bbox[4]);


  template <typename T>
  void PrepareImageData(vtkImageData *data,
                        vtkTextProperty *tprop,
                        const T& str,
                        int *x, int *y);


  template <typename T>
  bool PopulateImageData(vtkTextProperty *tprop, const T& str,
                         int x, int y, vtkImageData *data);

  bool GetSize(vtkTextProperty *tprop, FT_Size *size);

  bool GetFace(vtkTextProperty *tprop, FT_Face *face);

  bool GetGlyphIndex(vtkTextProperty *tprop, FT_UInt32 c, FT_UInt *gindex);


  enum
  {
    GLYPH_REQUEST_DEFAULT = 0,
    GLYPH_REQUEST_BITMAP  = 1,
    GLYPH_REQUEST_OUTLINE = 2
  };
  bool GetGlyph(vtkTextProperty *tprop,
                FT_UInt32 c,
                FT_Glyph *glyph,
                int request = GLYPH_REQUEST_DEFAULT);
  bool GetSize(unsigned long tprop_cache_id, int font_size, FT_Size *size);
  bool GetFace(unsigned long tprop_cache_id, FT_Face *face);
  bool GetGlyphIndex(unsigned long tprop_cache_id, FT_UInt32 c,
                     FT_UInt *gindex);
  bool GetGlyph(unsigned long tprop_cache_id,
                int font_size,
                FT_UInt gindex,
                FT_Glyph *glyph,
                int request = GLYPH_REQUEST_DEFAULT);

  bool ScaleToPowerTwo;

  vtkFreeTypeTools();
  virtual ~vtkFreeTypeTools();

private:
  vtkFreeTypeTools(const vtkFreeTypeTools&);  // Not implemented.
  void operator=(const vtkFreeTypeTools&);  // Not implemented.


  bool GetFace(vtkTextProperty *prop, unsigned long &prop_cache_id,
               FT_Face &face, bool &face_has_kerning);


  FT_Bitmap* GetBitmap(FT_UInt32 c, unsigned long prop_cache_id,
                       int prop_font_size, FT_UInt &gindex,
                       FT_BitmapGlyph &bitmap_glyph);

  // The singleton instance and the singleton cleanup instance
  static vtkFreeTypeTools* Instance;
  static vtkFreeTypeToolsCleanup Cleanup;

  // The cache manager, image cache and charmap cache
  FTC_Manager *CacheManager;
  FTC_ImageCache *ImageCache;
  FTC_CMapCache  *CMapCache;


  FTC_Manager* GetCacheManager();
  FTC_ImageCache* GetImageCache();
  FTC_CMapCache* GetCMapCache();

  unsigned int MaximumNumberOfFaces;
  unsigned int MaximumNumberOfSizes;
  unsigned long MaximumNumberOfBytes;

  void InitializeCacheManager();
  void ReleaseCacheManager();
};

#endif

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