CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGImage/plFont.h

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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*==LICENSE==*/
///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  plFont Class Header                                                      //
//  Seems like we've come full circle again. This is our generic Plasma      //
//  bitmap font class/format. Quick list of things it supports, or needs to: //
//      - Antialiasing, either in the font def or at rendertime              //
//      - Doublebyte character sets                                          //
//      - Platform independence, of course                                   //
//      - Render to reasonably arbitrary mipmap                              //
//      - Character-level kerning, both before and after, as well as         //
//        negative kerning (for ligatures)                                   //
//                                                                           //
//  Cyan, Inc.                                                               //
//                                                                           //
//// Version History //////////////////////////////////////////////////////////
//                                                                           //
//  5.4.2003 mcn - Created.                                                  //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#ifndef _plFont_h
#define _plFont_h

#include "HeadSpin.h"
#include "hsColorRGBA.h"
#include "hsTemplates.h"
#include "pcSmallRect.h"

#include "pnKeyedObject/hsKeyedObject.h"

#include <wchar.h>

class plBDFConvertCallback
{
    public:
        virtual void    NumChars( uint16_t chars ) {}
        virtual void    CharDone( void ) {}
};

//// Class Definition /////////////////////////////////////////////////////////

class plMipmap;
class plBDFHeaderParser;
class plBDFPropertiesParser;
class plBDFCharsParser;
class plFont : public hsKeyedObject
{
    public:

        enum RenderFlags
        {
            kRenderItalic       = 0x00000001,
            kRenderBold         = 0x00000002,
            kRenderScaleAA      = 0x00000004,
            kRenderClip         = 0x00000008,
            kRenderWrap         = 0x00000010,

            kRenderJustXLeft    = 0,
            kRenderJustXRight   = 0x00000020,   // X right justify
            kRenderJustXCenter  = 0x00000040,   // X center justify (left default)
            kRenderJustXForceLeft=0x00000080,   // Force left (no kerning)
            kRenderJustXMask    = 0x000000e0,

            kRenderJustYBaseline = 0,
            kRenderJustYTop     = 0x00000100,   // Y top justify
            kRenderJustYCenter  = 0x00000200,   // Y center justify
            kRenderJustYBottom  = 0x00000400,   // Y bottom justify (baseline is default)
            kRenderJustYMask    = 0x00000700,

            kRenderIntoAlpha    = 0x00000800,   // This option causes grayscale (AA) fonts to 
                                                // render into the alpha channel instead of the color
                                                // channel, so that the resulting pixels touched always
                                                // have the renderColor and the alpha = to the font pixel.
                                                // By default, we use the font pixel as an alpha blending
                                                // value between the renderColor and the destColor and
                                                // leave the alpha as-is
                                                // This flag has no effect on monochrome fonts
        };

        enum Flags
        {
            kFlagBold       = 0x00000001,
            kFlagItalic     = 0x00000002
        };

    protected:

        friend class plBDFHeaderParser;
        friend class plBDFPropertiesParser;
        friend class plBDFCharsParser;

        // Font face and size. This is just used for IDing purposes, not for rendering
        char    fFace[ 256 ];
        uint8_t   fSize;
        uint32_t  fFlags;

        // Size of the whole font bitmap. Fonts are stored vertically, one
        // character at a time, so fWidth is really the max width of any one
        // character bitmap, with of course the proper padding
        uint32_t  fWidth, fHeight;

        // Bpp of our font bitmap. We're grayscale, remember...
        uint8_t   fBPP;

        // Bitmap data!
        uint8_t   *fBMapData;

        // Our character class, for per-char info
        class plCharacter
        {
            public:
                uint32_t  fBitmapOff;     // Offset in the font bitmap in bytes 
                                        // to the first uint8_t of the character
                uint32_t  fHeight;        // Height in pixels of this character
                int32_t   fBaseline;      // Number of pixels down from the top of 
                                        // the char bitmap to the baseline.
                
                float    fLeftKern;  // Kerning values for this char, in pixels
                float    fRightKern; // Note that the right kern is relative to 
                                        // the right side of the bitmap area, which
                                        // is the width of the font bitmap, so
                                        // basically each character is the same width,
                                        // just kerned back!
                                        // (left kerning currently unsupported, just 
                                        // in here in case we need to eventually)

                plCharacter& operator=(const int zero) 
                { 
                    fBitmapOff=0;
                    fHeight = 0;
                    fBaseline = 0;
                    fLeftKern = 0;
                    fRightKern = 0;

                    return *this;
                }

                plCharacter();
                void    Read( hsStream *s );
                void    Write( hsStream *s );
        };

        // First character we encode--everything below this we don't render
        uint16_t  fFirstChar;

        // Our characters, stored in an hsTArray for easy construction
        hsTArray<plCharacter>   fCharacters;

        // Max character bitmap height and max ascent for any character
        uint32_t  fMaxCharHeight;
        int32_t   fFontAscent, fFontDescent;

        typedef void (plFont::*CharRenderFunc)( const plCharacter &c );

        // Render info
        class plRenderInfo
        {
            public:
                int16_t       fFirstLineIndent;
                int16_t       fX, fY, fNumCols, fFarthestX, fLastX, fLastY;
                int16_t       fMaxWidth, fMaxHeight, fMaxAscent, fMaxDescent;
                int16_t       fLineSpacing;
                uint8_t       *fDestPtr;
                uint32_t      fDestStride;
                uint8_t       fDestBPP;
                uint32_t      fColor;
                plMipmap    *fMipmap;
                uint32_t      fFlags;
                pcSmallRect fClipRect;
                float    fFloatWidth;

                const wchar_t   *fVolatileStringPtr;    // Just so we know where we clipped

                CharRenderFunc  fRenderFunc;
        };

        plRenderInfo    fRenderInfo;

        void    IClear( bool onConstruct = false );
        void    ICalcFontAscent( void );

        uint8_t   *IGetFreeCharData( uint32_t &newOffset );

        void    IRenderLoop( const wchar_t *string, int32_t maxCount );
        void    IRenderString( plMipmap *mip, uint16_t x, uint16_t y, const wchar_t *string, hsBool justCalc );

        // Various render functions
        void    IRenderChar1To32( const plCharacter &c );
        void    IRenderChar1To32AA( const plCharacter &c );
        void    IRenderChar8To32( const plCharacter &c );
        void    IRenderChar8To32Alpha( const plCharacter &c );
        void    IRenderChar8To32FullAlpha( const plCharacter &c );
        void    IRenderCharNull( const plCharacter &c );

    public:

        plFont();
        virtual ~plFont();

        CLASSNAME_REGISTER( plFont );
        GETINTERFACE_ANY( plFont, hsKeyedObject );

        virtual void    Read( hsStream *s, hsResMgr *mgr );
        virtual void    Write( hsStream *s, hsResMgr *mgr );

        const char  *GetFace( void ) const { return fFace; }
        uint8_t       GetSize( void ) const { return fSize; }
        uint16_t      GetFirstChar( void ) const { return fFirstChar; }
        uint16_t      GetNumChars( void ) const { return fCharacters.GetCount(); }
        uint32_t      GetFlags( void ) const { return fFlags; }
        float    GetDescent( void ) const { return (float)fFontDescent; }
        float    GetAscent( void ) const { return (float)fFontAscent; }

        uint32_t      GetBitmapWidth( void ) const { return fWidth; }
        uint32_t      GetBitmapHeight( void ) const { return fHeight; }
        uint8_t       GetBitmapBPP( void ) const { return fBPP; }

        void    SetFace( const char *face );
        void    SetSize( uint8_t size );
        void    SetFlags( uint32_t flags ) { fFlags = flags; }
        void    SetFlag( uint32_t flag, hsBool on ) { if( on ) fFlags |= flag; else fFlags &= ~flag; }
        hsBool  IsFlagSet( uint32_t flag ) { if( fFlags & flag ) return true; return false; }

        void    SetRenderColor( uint32_t color );
        void    SetRenderFlag( uint32_t flag, hsBool on ) { if( on ) fRenderInfo.fFlags |= flag; else fRenderInfo.fFlags &= ~flag; }
        hsBool  IsRenderFlagSet( uint32_t flag ) { return ( fRenderInfo.fFlags & flag ) ? true : false; }
        void    SetRenderClipRect( int16_t x, int16_t y, int16_t width, int16_t height );
        void    SetRenderXJustify( uint32_t j ) { fRenderInfo.fFlags &= ~kRenderJustXMask; fRenderInfo.fFlags |= j; }
        void    SetRenderYJustify( uint32_t j ) { fRenderInfo.fFlags &= ~kRenderJustYMask; fRenderInfo.fFlags |= j; }
        void    SetRenderFirstLineIndent( int16_t indent ) { fRenderInfo.fFirstLineIndent = indent; }
        void    SetRenderLineSpacing( int16_t spacing ) { fRenderInfo.fLineSpacing = spacing; }

        // Sets flags too
        void    SetRenderClipping( int16_t x, int16_t y, int16_t width, int16_t height );
        void    SetRenderWrapping( int16_t x, int16_t y, int16_t width, int16_t height );

        void    RenderString( plMipmap *mip, uint16_t x, uint16_t y, const char *string, uint16_t *lastX = nil, uint16_t *lastY = nil );
        void    RenderString( plMipmap *mip, uint16_t x, uint16_t y, const wchar_t *string, uint16_t *lastX = nil, uint16_t *lastY = nil );

        uint16_t  CalcStringWidth( const char *string );
        uint16_t  CalcStringWidth( const wchar_t *string );
        void    CalcStringExtents( const char *string, uint16_t &width, uint16_t &height, uint16_t &ascent, uint32_t &firstClippedChar, uint16_t &lastX, uint16_t &lastY );
        void    CalcStringExtents( const wchar_t *string, uint16_t &width, uint16_t &height, uint16_t &ascent, uint32_t &firstClippedChar, uint16_t &lastX, uint16_t &lastY );

        hsBool  LoadFromFNT( const char *path );
        hsBool  LoadFromFNTStream( hsStream *stream );

        hsBool  LoadFromBDF( const char *path, plBDFConvertCallback *callback );
        hsBool  LoadFromBDFStream( hsStream *stream, plBDFConvertCallback *callback );

        hsBool  LoadFromP2FFile( const char *path );

        hsBool  ReadRaw( hsStream *stream );
        hsBool  WriteRaw( hsStream *stream );
};

#endif // _plFont_h