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/*
* FTGL - OpenGL font library
*
* Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __FTFace__
#define __FTFace__
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include "FTGL/ftgl.h"
#include "FTSize.h"
/**
* FTFace class provides an abstraction layer for the Freetype Face.
*
* @see "Freetype 2 Documentation"
*
*/
class FTFace
{
public:
/**
* Opens and reads a face file. Error is set.
*
* @param fontFilePath font file path.
*/
FTFace(const char* fontFilePath, bool precomputeKerning = true);
/**
* Read face data from an in-memory buffer. Error is set.
*
* @param pBufferBytes the in-memory buffer
* @param bufferSizeInBytes the length of the buffer in bytes
*/
FTFace(const unsigned char *pBufferBytes, size_t bufferSizeInBytes,
bool precomputeKerning = true);
/**
* Destructor
*
* Disposes of the current Freetype Face.
*/
virtual ~FTFace();
/**
* Attach auxilliary file to font (e.g., font metrics).
*
* @param fontFilePath auxilliary font file path.
* @return <code>true</code> if file has opened
* successfully.
*/
bool Attach(const char* fontFilePath);
/**
* Attach auxilliary data to font (e.g., font metrics) from memory
*
* @param pBufferBytes the in-memory buffer
* @param bufferSizeInBytes the length of the buffer in bytes
* @return <code>true</code> if file has opened
* successfully.
*/
bool Attach(const unsigned char *pBufferBytes,
size_t bufferSizeInBytes);
/**
* Get the freetype face object..
*
* @return pointer to an FT_Face.
*/
FT_Face* Face() const { return ftFace; }
/**
* Sets the char size for the current face.
*
* This doesn't guarantee that the size was set correctly. Clients
* should check errors.
*
* @param size the face size in points (1/72 inch)
* @param res the resolution of the target device.
* @return <code>FTSize</code> object
*/
const FTSize& Size(const unsigned int size, const unsigned int res);
/**
* Get the number of character maps in this face.
*
* @return character map count.
*/
unsigned int CharMapCount() const;
/**
* Get a list of character maps in this face.
*
* @return pointer to the first encoding.
*/
FT_Encoding* CharMapList();
/**
* Gets the kerning vector between two glyphs
*/
FTPoint KernAdvance(unsigned int index1, unsigned int index2);
/**
* Loads and creates a Freetype glyph.
*/
FT_GlyphSlot Glyph(unsigned int index, FT_Int load_flags);
/**
* Gets the number of glyphs in the current face.
*/
unsigned int GlyphCount() const { return numGlyphs; }
/**
* Queries for errors.
*
* @return The current error code.
*/
FT_Error Error() const { return err; }
private:
/**
* The Freetype face
*/
FT_Face* ftFace;
/**
* The size object associated with this face
*/
FTSize charSize;
/**
* The number of glyphs in this face
*/
int numGlyphs;
FT_Encoding* fontEncodingList;
/**
* This face has kerning tables
*/
bool hasKerningTable;
/**
* If this face has kerning tables, we can cache them.
*/
void BuildKerningCache();
static const unsigned int MAX_PRECOMPUTED = 128;
float *kerningCache;
/**
* Current error code. Zero means no error.
*/
FT_Error err;
};
#endif // __FTFace__
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