FntWrapGLFontAtlas.h

/*
* Copyright (C) TES Electronic Solutions GmbH,
* All Rights Reserved.
* Contact: info@guiliani.de
*
* This file is part of the Guiliani HMI framework
* for the development of graphical user interfaces on embedded systems.
*/
 
#ifndef __FNTWRAP_GL_FONTATLAS__H__
#define __FNTWRAP_GL_FONTATLAS__H__
 
//FreeType includes
#include "ft2build.h"
#include FT_GLYPH_H
 
#include "eC_Types.h"
#include "eC_TArray.h"
#include "GUIFontResource.h"
 
class CFntWrapGLFontAtlas
{
public:
    struct FontAtlasRecord_t
    {
        FontAtlasRecord_t() :
            m_uiUnicode(0xFFFF),
            m_iGlyphXPos(0),
            m_iGlyphYPos(0),
            m_iGlyphWidth(0),
            m_iGlyphHeight(0),
            m_uiXAdvance(0),
            m_uiXPos(0),
            m_uiYPos(0)
        {}
 
        eC_UInt m_uiUnicode; 
        eC_Int m_iGlyphXPos; 
        eC_Int m_iGlyphYPos; 
        eC_Int m_iGlyphWidth; 
        eC_Int m_iGlyphHeight; 
        eC_UInt m_uiXAdvance; 
        eC_UInt m_uiXPos; 
        eC_UInt m_uiYPos; 
    };
 
    CFntWrapGLFontAtlas(
        const FontResource_t& reFontID,
        const eC_UInt& uiNumberOfRows);
 
    virtual ~CFntWrapGLFontAtlas();
 
    FontAtlasRecord_t GetChar(const eC_UInt &uiUnicode);
 
    inline eC_Int GetHeight() const { return m_iFontHeight; }
 
    inline eC_Int GetAscender() const { return m_iAscender; }
 
    inline eC_Int GetDescender() const { return m_iDescender; }
 
    inline eC_Int GetInternalLeading() const { return m_iInternalLeading; }
 
    eC_UInt GetTextureID() const { return m_uiTextureID; }
 
    eC_UInt GetTextureWidth() const { return m_uiTextureWidth; }
 
    eC_UInt GetTextureHeight() const { return m_uiTextureHeight; }
 
    virtual void* GetFace() = 0;
 
protected:
    virtual FontAtlasRecord_t AddGlyph(const eC_UInt &uiUnicode) = 0;
 
    eC_UInt CreateTexture(
        const eC_Int& iTextureWidth,
        const eC_Int& iTextureHeight,
        const eC_UInt& uiLastTextureID = 0);
 
    void DeleteTexture(const eC_UInt& uiTextureID);
 
    eC_UInt InsertGlyphInformation(
        const eC_UInt& uiUnicode,
        const eC_UInt& uiWidth,
        const eC_Int& iGlyphXPos,
        const eC_Int& iGlyphYPos,
        const eC_Int& iGlyphWidth,
        const eC_Int& iGlyphHeight,
        const eC_UInt& uiXPos,
        const eC_UInt& uiYPos);
 
private:
    eC_Int FindChar(const eC_UInt &uiUnicode);
 
    void Swap(
        FontAtlasRecord_t *pPosA,
        FontAtlasRecord_t *pPosB);
 
    void Sort();
 
    CFntWrapGLFontAtlas(const CFntWrapGLFontAtlas& kSource);
 
    CFntWrapGLFontAtlas& operator=(const CFntWrapGLFontAtlas& kSource);
 
protected:
    FontResource_t m_eFontID;           
    eC_Int m_iAscender;                 
    eC_Int m_iDescender;                
    eC_Int m_iInternalLeading;          
    eC_Int m_iFontWidth;                
    eC_Int m_iFontHeight;               
 
    eC_UInt m_uiTotalNumberOfRows;      
    eC_UInt m_uiCurrentFillRow;         
    eC_UInt m_uiRemainingSpace;         
    eC_UInt m_uiTextureID;              
    eC_UInt m_uiTextureWidth;           
    eC_UInt m_uiTextureHeight;          
 
    eC_TArray<FontAtlasRecord_t> m_asGlyphCache;  
    eC_UInt m_uiNumberOfCachedGlyphs;   
    eC_Bool m_bArrayNeedsSorting;       
};
#endif