pngfiltr.h

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// $Id: pngfiltr.h 809 2006-04-13 11:28:42Z phil $
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================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
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----------------------------------

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 */
//

#ifndef INC_PNGFILTR
#define INC_PNGFILTR

#include "maskfilt.h"
#include "outptpng.h"
#include "bmpprefs.h"   // SelectionType
//#include "filtrres.h"

class KernelBitmap;

/********************************************************************************************

>   class PNGExportOptions : public MaskedFilterExportOptions

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30/10/96
    Purpose:    Base class for storing information about the bitmap we're exporting.

********************************************************************************************/

class PNGExportOptions : public MaskedFilterExportOptions
{
CC_DECLARE_DYNCREATE(PNGExportOptions)

public:
    static BOOL Declare();

    PNGExportOptions(const FilterType FilterID, const StringBase* pFilterName);
    PNGExportOptions() {};

    virtual BOOL    GetSupportsImageMap() { return TRUE; }

    virtual BOOL    RetrieveDefaults();
    virtual BOOL    SetAsDefaults() const;
    
    virtual UINT32 GetFilterNameStrID() { return _R(IDS_FILTERNAME_PNG);}



protected:
    static  UINT32 g_CompactedFlagsForDefaults;
};

/********************************************************************************************

>   class PNGFilter : public MaskedFilter

    Author:     Neville_Humphrys (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/4/96
    Purpose:    Encapsulates a PNG export filter.
                Derives off the masked filter which provides funcitonality for doing masked
                bitmap export and import.

********************************************************************************************/

class PNGFilter : public MaskedFilter
{
    CC_DECLARE_DYNAMIC(PNGFilter);
    
public:

    PNGFilter();
    BOOL Init();

    virtual INT32 HowCompatible( PathName& Filename, ADDR HeaderStart, UINT32 HeaderSize,
        UINT32 FileSize );

    virtual FilterType GetFilterType() const { return PNG; }

    // Import related functions
    virtual BOOL ReadFromFile(OILBitmap* pOilBitmap);
    // This is the function for native/web files to use
    virtual BOOL ReadFromFile(OILBitmap* pOilBitmap, BaseCamelotFilter* pFilter,
                              CCLexFile* pFile, BOOL IsCompressed);

    // Function for web/native filters to use to write out the bitmap data to file
    virtual BOOL WriteBitmapToFile(KernelBitmap* pKernelBitmap, BaseCamelotFilter* pFilter,
                                   CCLexFile* pFile, INT32 Compression);

    // Check if this Bitmap filter can cope with saving at this Bpp/Colour depth
    virtual BOOL IsThisBppOk(UINT32 Bpp);

    // Public way of finding out how compatable the PNG filter thought the file was
    // We might want to bring in the Accusoft filter to help out.
    virtual INT32 GetPNGCompatibility() { return PNGHowCompatible; }

    // Virtual overrides
    virtual UINT32 GetExportMsgID();
    virtual void PostGetExportOptions(BitmapExportOptions* pOptions);

protected:

    // Invert the alpha channel.
    virtual void InvertAlpha ( LPBITMAPINFO lpBitmapInfo,
                               LPBYTE       lpBits );

    // Get the correct output DIB.
    virtual OutputDIB* GetOutputDIB ( void );

    virtual BitmapExportOptions*    CreateExportOptions() const;

    virtual BOOL GetExportOptions( BitmapExportOptions* pOptions );
    virtual void CleanUpAfterExport();
    virtual BOOL EndWriteToFile();

    virtual BOOL WriteFileHeader(void) { return TRUE; }
    virtual BOOL WritePreFrame(void);
    virtual BOOL WritePreSecondPass(void);
    virtual BOOL WritePostOptimisedPalette(void) { return TRUE; }
    virtual BOOL WriteFrame(void);
    virtual BOOL WritePostFrame(void);
    virtual BOOL WriteFileEnd(void);

    virtual BOOL WriteBitmapToFile(KernelBitmap* pKernelBitmap, double Dpi);

    // this is used for the actual writing of the file
    static BOOL WriteDataToFile( BOOL End, UINT32 Bpp, UINT32 Compression);
    static BOOL WriteToFile ( CCLexFile*, LPBITMAPINFO Info, LPBYTE Bits,
                              String_64* ProgressString = NULL);

    // This is the form used for direct saving bitmaps into the native/web file format
    static BOOL WriteToFile ( CCLexFile*, LPBITMAPINFO Info, LPBYTE Bits,
                              BOOL Interlace, INT32 TransparentColour,
                              BaseCamelotFilter* pFilter = NULL);

    void AlterPaletteContents( LPLOGPALETTE pPalette );//ap

#ifdef DO_EXPORT
    // The class we use for actually outputting the PNG data and converting from 32 to n bpps
    static OutputPNG DestPNG;
#endif
    
    // This is so we can remember what we thought of the GIF file.
    INT32 PNGHowCompatible;

    static FilterType s_FilterType;                     // Type of filter in use i.e. PNG

    // The string to display when exporting the second stage.
    UINT32 Export2ndStageMsgID;
};

#endif // INC_PNGFILTR

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