drawfltr.h

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// $Id: drawfltr.h 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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

// An input filter for importing RISC OS Draw format files.

#ifndef INC_DRAWFLTR
#define INC_DRAWFLTR

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

class Node;

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

>   class DrawFileHeader

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    18/11/93
    Purpose:    Holds the information contained in the header of an Acorn Draw file.
    SeeAlso:    DrawObjectHeader; AcornDrawFilter

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

class DrawFileHeader
{
public:
    // Should be the string "Draw"
    char        Ident[4];

    // version number and name of program that created the Draw file
    UINT32      MajorVersion;
    UINT32      MinorVersion;
    char        Creator[12];

    // Bounding box of the whole draw file
    DocCoord    BBoxLo;
    DocCoord    BBoxHi;
};

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

    typedef DrawObjectType

    This is a simple type to decode the object types in an Acorn Draw file.

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

typedef INT32 DrawObjectType;


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

>   class DrawObjectHeader

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    18/11/93
    Purpose:    Contains the information contained in an object header of an Acorn Draw file.
    SeeAlso:    DrawFileHeader; AcornDrawFilter

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

class DrawObjectHeader
{
public:
    // Type and size of object
    DrawObjectType  Type;
    UINT32          Size;

    // Bounding box of this object
    DocCoord        BBoxLo;
    DocCoord        BBoxHi;
};



// Various forward declarations for the AcornDrawFilter class
class PathName;
class Document;
class NodePath;
class Layer;
class AttrLineWidth;
class AttrStrokeColour;
class AttrFillColour;
class OpImportAcornDraw;
class Page;
class DrawPathHeader;

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

>   class AcornDrawFilter : public VectorFilter

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/10/93
    Purpose:    Encapsulates an RISC OS Draw input filter system.

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

class AcornDrawFilter : public VectorFilter
{
    CC_DECLARE_DYNAMIC(AcornDrawFilter);
    
public:
    AcornDrawFilter();
    ~AcornDrawFilter();
    BOOL Init();    

    // Works out if opening a file of this type requires a default document to be loaded
    // or does the file format supply the document.
    virtual BOOL IsDefaultDocRequired(const TCHAR* pcszPathName);

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

    BOOL DoImport(SelOperation *Op, CCLexFile*, Document *DestDoc, 
                  BOOL AutoChosen, ImportPosition *Pos = NULL,
                  KernelBitmap** ppImportedBitmap = NULL,
                  DocCoord* pPosTranslate = NULL, String_256* = NULL);

    BOOL DoExport(Operation*, CCLexFile*, PathName*, Document*, BOOL);

private:
    BOOL PrepareToImport();
    void CleanUpAfterImport();
        
    // The file we are reading
    CCLexFile *DrawFile;
    
    // TRUE if the EOF has been reached
    BOOL eof;
    
    // The layer that objects are placed on
    Layer *pLayer;
    
    // The page that objects appear on
    Page *pPage;
    
    // The Node to which new objects are attached (may be a Layer or a Group node)
    Node *pNode;
    
    // TRUE if a complex path is being constructed
    BOOL ComplexPath;
    
    // TRUE if the path being constructed has not had any attributes added yet
    BOOL NoAttributes;

    // Co-ordinate transformations
    DocCoord Origin;

    // TransformCoord() - converts a DocCoord from Draw units (1/640 of a point) to
    // Camelot units (millipoints). (the factor 1000/640 is reduced to 25/16)
    void TransformCoord(DocCoord& C) 
        {   C.x *= 25; C.x /= 16; C.x += Origin.x;
            C.y *= 25; C.y /= 16; C.y += Origin.y; };

    // Buffers to hold data read from the Draw file.
    DrawFileHeader   FileHeader;
    DrawObjectHeader ObjectHeader;
    ADDR DataBuf; // Dynamically allocated when the file is read.
    UINT32 DataBufSize;
    UINT32 HeaderSize; // Not necessarily sizeof(DrawObjectHeader)! (Thanks, Acorn...)
    UINT32 DataSize;

    // Functions to read in and process the Draw objects
    BOOL ReadFileHeader();
    BOOL ReadObjectHeader();
    BOOL ReadObjectData();
    BOOL ProcessObject();
    BOOL ProcessPath();
    BOOL ProcessGroup();
    BOOL ProcessTaggedObject();
    BOOL SkipObject();
    BOOL AddAttributes(NodePath *pPath, DrawPathHeader *pHeader);

    // Used to update progress bar etc
    INT32 BytesRead;
    INT32 LastProgressUpdate;
};


#endif

---