kerneldc.h

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// $Id: kerneldc.h 1354 2006-06-23 20:23:25Z alex $
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================================XARAHEADERSTART===========================
 
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----------------------------------

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=================================XARAHEADEREND============================
 */

// Device Contexts that are kernel-safe.

#ifndef INC_KERNELDC
#define INC_KERNELDC

#include "ccdc.h"
//#include "ccfile.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "doccolor.h" - in camtypes.h [AUTOMATICALLY REMOVED]


// Used to control the output of 'user space values' (See KernelDC::OutputUserSpaceValue).
typedef enum
{
    ACCURACY_NORMAL,    // Output to 2dp
    ACCURACY_ROUNDUP,   // Output to 0dp, rounding up
    ACCURACY_ROUNDDOWN  // Output to 0dp, rounding down
} EPSAccuracy;

class Filter;


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

>   class KernelDC : public CwxDC

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    23/04/95
    Purpose:    Provide a base device context for rendering to something other than the
                screen.  This includes printers, files, and PostScript devices.

                The main purpose of this class is to provide a repository for our bespoke
                PostScript procedures.  This base class cannot use them as the centralised
                output routines are unimplemented and will error if called.  Derived
                classes such as EPSExportDC and PrintPSDC will override these output
                functions, so the PostScript output routines can be used.  This class
                provides basic primitives for writing out EPS/PS tokens such as commands,
                colours, and user space values (line-widths, co-ordinates etc).
                The DC takes care of handling formatting such as separating tokens with
                a space or newline, and limits line widths to a reasonable size.

    SeeAlso:    EPSExportDC; ExportDC; PrintPSDC

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

class KernelDC : public CCDummyDC
{
    CC_DECLARE_DYNAMIC(KernelDC)
public:
    KernelDC(RenderType Type);
    KernelDC(CNativeDC * pDC, RenderType Type);

public:
    // Functions to output in PostScript format.

    // These three functions must be over-ridden in base classes in order that the other
    // OutputXXX() functions can actually be used.  (The base class versions of these three
    // functions will error if called).
    virtual BOOL OutputNewLine();
    virtual BOOL OutputToken(TCHAR*);
    virtual BOOL OutputDirect(BYTE *, INT32);
    virtual BOOL OutputTCHARAsChar(TCHAR *Buf, INT32 nBytes);

    void SetOrigin(DocCoord&);
    DocCoord GetOrigin() { return Origin; }
    virtual BOOL OutputCoord(DocCoord&, EPSAccuracy Accuracy = ACCURACY_NORMAL);
    virtual BOOL OutputUserSpaceValue(MILLIPOINT, EPSAccuracy Accuracy = ACCURACY_NORMAL);
    BOOL OutputColour(PColourCMYK*);
    BOOL OutputNamedColour(DocColour*, ColourContext* pContext=NULL);
    BOOL OutputColourValue(UINT32 n);
    BOOL OutputString(TCHAR *);
    BOOL OutputValue(INT32);
    BOOL OutputValue(UINT32);
    BOOL OutputReal(double);
    BOOL OutputFloat(const double Value, const UINT32 DecPl);
    BOOL OutputMatrix(Matrix * M);
    BOOL OutputArray(INT32*, INT32);

    // (Chris G 29/11/00) Function to Output a colour's name ONLY.
    BOOL OutputColourName (DocColour* pCol);

    virtual INT32 OutputRawBinary(BYTE *Data, UINT32 Length, UINT32 Alignment = 1);

    BOOL StartASCII85Output(BOOL RunLengthEncode = FALSE);
    INT32 OutputASCII85(BYTE *Data, UINT32 Length);
    INT32 EndASCII85Output();

    void SetFullAccuracy(BOOL);

    virtual Filter* GetParentFilter() { return NULL; }

protected:
    void ConvertToHex(BYTE *Data, UINT32 Length, TCHAR *Buf);

    BYTE *RunLengthEncode(BYTE *Data, INT32 *Length);
    BYTE *RunLengthDecode(BYTE *Data, INT32 *Length);

    // Routines for ASCII85 encoding.
    BOOL QueueASCII85Data(BYTE *Data, UINT32 Length);
    INT32 FlushASCII85Buffer();
    INT32 ConvertToASCII85(BYTE *Src, UINT32 Length, BYTE *Dest);
    INT32 ConvertFromASCII85(BYTE *Src, UINT32 Length, BYTE *Dest);

    // The width of the line currently being output (to control line wrap).
    UINT32 LineWidth;

    // The origin (as set by SetOrigin) of the EPS file.
    DocCoord Origin;

    // Whether to output user space values as 2dp or 3dp.
    BOOL FullAccuracy;

    // Converts millipoints to an ASCII representation of the value, in points.
    void ConvertToPoints(MILLIPOINT, TCHAR *);

    // Buffer for converting to ASCII85.
    LPBYTE RawBuf, A85Buf;
    UINT32 RawBufSize;
    BOOL RLEtheASCII85Data;
};


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

>   class ExportDC : public CwxDC

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    28/03/94
    Purpose:    Provide a device context for rendering to a file rather than the screen.
                This base class handles opening the file.
    SeeAlso:    EPSExportDC

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

class ExportDC : public KernelDC
{
public:
    ExportDC(Filter *Parent);
    ~ExportDC();

    BOOL Init(CCLexFile*);
    virtual Filter* GetParentFilter();

    CCLexFile* ExportFile;

protected:
    Filter* ParentFilter;
};


#endif  // INC_KERNELDC

---