bshadow.h

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// $Id: bshadow.h 751 2006-03-31 15:43:49Z 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
----------------------------------

This file is part of Xara LX.

Xara LX is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 as published
by the Free Software Foundation.

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-----------------

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The additional rights are to use, modify, and distribute the software
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=================================XARAHEADEREND============================
 */
#ifndef _BITMAPSHADOW_H_
#define _BITMAPSHADOW_H_

#include "bshadow2.h"

#ifdef BUILDSHADOWS

//const UINT32 MAX_SHADOW_BLUR  = 100 ;     // Maximum amount of blur
//const UINT32 MAX_CONTOUR      = 100 ;     // Maximum contour pixel size.
//const double MIN_BLUR_DIAMETER = 0.71;    // Minimum blur diameter is sqrt(0.5), rounded up
                                        // a little to safely avoid boundary conditions.

class ShadowBitmap : public CCObject
{
// CC_DECLARE_DYNCREATE(ShadowBitmap);
public:
    ShadowBitmap();
    ~ShadowBitmap();

    BOOL CreateFilled(INT32 Width, INT32 Height, BYTE value, UINT32 Depth = 32);
    
    BOOL Create8BitBitmap(UINT32 * pBits, UINT32 Width, UINT32 Height);

    HRESULT Create(INT32 Width, INT32 Height, UINT32 Depth = 32);
    LPBYTE GetBytes() { return (LPBYTE)m_Bytes; }

    INT32 GetWidth() { return m_Width; }
    INT32 GetHeight() { return m_Height; }
    UINT32 GetDepth() { return m_Depth; }

private:
    INT32 m_Width;
    INT32 m_Height;
    BYTE * m_Bytes;
    UINT32 m_Depth;
} ;

class CBitmapShadow : public ShadowBitmap
{
    friend class NodeFeatherEffect;

// CC_DECLARE_DYNCREATE(CBitmapShadow);
public:
    enum {
//      MAX_ROW_OFFSETS = MAX_SHADOW_BLUR*2+1,  // Maximum size of shadow mask.
//      TABLE_SIZE = 0x800                      // Maximum lookup table size for shadow generation.
    } ;

    CBitmapShadow();
        
    BOOL CreateShadow(const BOOL bIsWallShadow,
                                            const double dProjection,
                                            const double dTiltAngle,
                                            const double dBlurriness,
                                            const double dDarknessCoeff,
                                            const double dPositionX,
                                            const double dPositionY,
                                            UINT32* pForegroundBits,
                                            const CNativeSize ForegroundSize
                                            );

    void GetShadowOffset(INT32* pOffsetX, INT32* pOffsetY)
    {
        *pOffsetX = m_OffsetX;
        *pOffsetY = m_OffsetY;      
    }

    BOOL IsWallShadow(void) const
    {
        return m_bIsWallShadow;
    }

    double GetBlurriness(void) const
    {
        return m_dBlurriness;
    }

    double GetDarknessCoeff(void) const
    {
        return m_dDarknessCoeff;
    }

private:
    BOOL MakeWallShadow (const UINT32* pForegroundBits,
                                    const CNativeSize ForegroundSize,
                                    const INT32 nXPosition,
                                    const INT32 nYPosition,
                                    const double fBlur,
                                    INT32 *pOffsetX,
                                    INT32 *pOffsetY,
                                    const double dDarknessCoeff = 1.0);

    BOOL MakeCastShadow (UINT32* pForegroundBits,
                                const CNativeSize ForegroundSize,
                                const double fBlur,                                  
                                const double dTiltAngle, 
                                const double dProjection,
                                const double dDarknessCoeff = 1.0 );

    BOOL m_bIsWallShadow;
    double m_dProjection;
    double m_dTiltAngle;
    double m_dBlurriness;
    double m_dDarknessCoeff;
    double m_dPositionX;
    double m_dPositionY;
    INT32 m_OffsetX;
    INT32 m_OffsetY;

protected:
    ShadowBitmap* Tilt(BYTE* pSourceBits, const INT32 nSourceWidth, const INT32 nSourceHeight, const double dTiltDegrees);
    static bool ProjectShadow(BYTE* pSBitmap, BYTE* pDBitmap, UINT32 nWidth, UINT32 nSHeight, UINT32 nDHeight);


// Karim 02/08/2000
// made this static so it can be accessed by the public static feathering
// function.

public:
    // Karim 08/08/2000
    // Blur the source bitmap, storing the result in the destination bitmap.

    static void Blur8BppBitmap( LPBITMAPINFOHEADER pSrcBMIHeader,   LPBYTE pSrcBits,
                                LPBITMAPINFOHEADER pDestBMIHeader,  LPBYTE pDestBits,
                                const UINT32 DWordBitmapWidth, const double fBlur );

    // Karim 17/08/2000
    // Determine whether the resultant bitmap for this blur setting
    // will be offset up and right by half a pixel.
    static BOOL BlurringWillOffsetBitmap(double fBlurDiameter)
    {
        // bitmap will be offset if the blur diameter is even,
        // and is not smaller than the minimum blur diameter.
        return (    ((UINT32)(fBlurDiameter + 0.5) % 2 == 0) &&
                    !(fBlurDiameter < MIN_BLUR_DIAMETER)    );
    }

    static UINT32 GetWholePixelBlurDiameter(double fBlurDiameter)
    {
        double fNewBlur = fBlurDiameter / 2.0;
        if (fNewBlur > MAX_SHADOW_BLUR)
            fNewBlur = MAX_SHADOW_BLUR;

        return (UINT32)(2 * fNewBlur + 0.5);
    }

    static LPBITMAPINFO Feather8BppBitmap(
        const double fBlur,
        LPBITMAPINFO pSrcInfo,
        LPBYTE pSrcBits32,
        LPBYTE* pDestBits
    ) ;

    //
    // Gavin 24/11/2004
    //
    // Contour the 32bpp source bitmap, putting the result into the 32bpp destination bitmap.
    //
    static bool ContourBitmap(
                        const LPBITMAPINFO  pSrcInfo32,
                        const LPBYTE        pSrcBits32,
                        const double        fContour,
                        const BYTE          uThreshold,
                        LPBITMAPINFO*       ppDestInfo32,
                        LPBYTE*             ppDestBits32,
                        double*             pfOffsetX,
                        double*             pfOffsetY
                    ) ;
    //
    // Gavin 20/04/2005
    //
    // Contour the 8bpp source bitmap, putting the result into the 8bpp destination bitmap.
    //
    static bool ContourBitmap(
                        const LPBITMAPINFO  pSrcInfo8,
                        const LPBYTE        pSrcBits8,
                        const double        fContour,
                        const bool          bInside,
                        const BYTE          uThreshold,
                        LPBITMAPINFO*       ppDestInfo8,
                        LPBYTE*             ppDestBits8,
                        double*             pfOffsetX,
                        double*             pfOffsetY
                    ) ;

protected:
} ;

#endif

#endif //_BITMAPSHADOW_H_

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