StyleDialog - A transparent dialog class with an optional custom frame

//
// Layers.h: header file for the Layers class.
//
// Author:  Darren Sessions
//          
//
// Description:
//   
//		The Layers class contains all the structures and arrays used by the 
//		Style Toolkit.
//
// History
//     Version 1.1 - 2008 August 1
//     - More features added
//
//     Version 1.0 - 2008 July 22
//     - Initial public release
//
// License:
//     This software is released under the Code Project Open License (CPOL),
//     which may be found here:  http://www.codeproject.com/info/eula.aspx
//     You are free to use this software in any way you like, except that you 
//     may not sell this source code.
//
//     This software is provided "as is" with no expressed or implied warranty.
//     I accept no liability for any damage or loss of business that this 
//     software may cause.
//
///////////////////////////////////////////////////////////////////////////////

#pragma once

#pragma warning( disable : 4786 )

#include <vector>
using namespace std;

#include "Border.h"
#include "GResource.h"
#include "MemDC.h"
#include "colors.h"
#include "StyleEnum.h"

//////////////////////////////////////////////////////////////////////
// This class allows the API to take arguments of COLORREF or Color
//////////////////////////////////////////////////////////////////////
class Clr
{
public:
	Clr(Color color)		{ value = color; }

	Clr(COLORREF c)			{ value = ARGB(	((  0x000000ff) << 24) | 
											((c&0x000000ff) << 16) |
											((c&0x0000ff00) <<  0) |
											((c&0x00ff0000) >> 16) );  }

	Clr(int a, COLORREF c)	{ value = ARGB(	((a&0x000000ff) << 24) | 
											((c&0x000000ff) << 16) |
											((c&0x0000ff00) <<  0) |
											((c&0x00ff0000) >> 16) );  }

	COLORREF GetRGB()		{ COLORREF rgb = (	(value.GetR() <<  0) |
												(value.GetG() <<  8) |
												(value.GetB() << 16) ) ;
												return rgb; }

	ARGB Blend(const ARGB bg, const ARGB src)	
	{	
		ARGB a = src >> 24; 
		if (0 == a)	return bg;
		ARGB rb = (((src & 0x00ff00ff) * a) +
		((bg & 0x00ff00ff) * (0xff - a))) & 0xff00ff00;
		ARGB g = (((src & 0x0000ff00) * a) +
		((bg & 0x0000ff00) * (0xff - a))) & 0x00ff0000;
		return (src & 0xff000000) | ((rb | g) >> 8);
	}

	Color Blend(const Color other)
	{
		ARGB src = other.GetValue();
		ARGB bg = value.GetValue();
		return Color(Blend(bg, src));
	}


public:
	Color value;
};

//////////////////////////////////////////////////////////////////////
// This class allows the API to take arguments of CRect or Rect
//////////////////////////////////////////////////////////////////////
class SRect
{
public:
	SRect(Rect r)		{	rect = r; }

	SRect(CRect cr)		{	rect.X = cr.left; rect.Y = cr.top; 
							rect.Width = cr.Width(); rect.Height = cr.Height(); }
public:
	Rect rect;
};

//////////////////////////////////////////////////////////////////////
// This class allows the API to take arguments of CPoint or Point
//////////////////////////////////////////////////////////////////////
class SPoint
{
public:
	SPoint(Point p)		{	point = p; }

	SPoint(CPoint cp)	{	point.X = cp.x; point.Y = cp.y; }

public:
	Point point;
};


///////////////////////////////////////////////////////////////////////////
// This class contains the frame and all the layers, strings and images
///////////////////////////////////////////////////////////////////////////
class Layers  
{
public:

	// constructors
	Layers();
	Layers(int alloc);			
	~Layers();

	//==========================================================================================//
	//		The main paint function called by the Style class
	//==========================================================================================//
	void	PaintStack(MemDC* pDC, Graphics* pGraphics);
	void	PaintStaticStack(CDC* pDC, Graphics* pGraphics);	// future

	void	SetClipping(Graphics* pGraphics);
	void	RestoreClipping(Graphics* pGraphics);

	CDC*	GetDC() { return &m_dc; }

	// conversion function
	RectF	MakeRectF(Rect r) { RectF rf(	(float)r.X, (float)r.Y, 
											(float)r.Width, (float)r.Height ); 
								return rf; }

protected:		

	Layers(const Layers& other);
    Layers& operator=(const Layers& other);

	void	Copy(const Layers& other);
    void	CopyLayers(const Layers& other);
	void	Init(int alloc = 10);

	void	MakeFrame(SRect rect);
	void	MakeFrameRgn();

	int		AddLayer();
	int		AddLayer(SRect sr, Clr clr);

	void	SetShape(int shape, int xradius = 0);
	void	Regenerate(int layerIdx = -1);
	
	void	Transform(int xform);

public:

	typedef struct _OPERATION
	{
		Rect		lrect;

		Color		clr1;
		Color		clr2;
		Color		clr3;

		int			LayerType;
		int			LayerShape;

		union
		{
			int		width;
			int		gradMode;
			int		clipMode;
			int		imgIndex;
			int		strIndex;
		};

		REAL	rParams[3];
		int		rgnIndex[2];

		Region*		pRegion;

	} OPERATION;

	typedef struct _TEXTINFO
	{
		WCHAR		fname[32];
		PointF		foffset;
		int			align;
		int			fsize;
		int			fstyle;
		wstring		string;

	} TEXTINFO;

	typedef struct _IMAGEINFO
	{
		int			clip;
		int			xform;
		Point		destpt;
		Point		srcpt;
		UINT		resID;
		LPCTSTR		resType;
		GResource*	pImage;

	} IMAGEINFO;

	typedef struct _FRAME
	{
		Rect		frect;	
		Region		clipRgn;

		Border		OuterBorder;	
		Border		MiddleBorder;
		Border		InnerBorder;

		BOOL		bUseBitmap;

	} FRAME;

	///////////// data elements /////////////////

	FRAME		Frame;

	vector<OPERATION>					m_Layers;
	vector<OPERATION>::iterator			layer;
	vector<OPERATION>::const_iterator	clayer;

	vector<TEXTINFO>					m_Strings;
	vector<TEXTINFO>::iterator			wsIter;
	vector<TEXTINFO>::const_iterator	cwsIter;

	vector<IMAGEINFO>					m_Images;
	vector<IMAGEINFO>::iterator			image;
	vector<IMAGEINFO>::const_iterator	cimage;
	/////////////////////////////////////////////

private:

	void PaintLayers();
	void PaintImage();
	void PaintString();
	void PaintEffectString();
	void PaintBorders();
	void PaintBar();

	void Fill(Brush* pBrush);
	void CombineRgns(Region* pRgn1, Region* pRgn2, int mode);
	void RegionBlur(Region* pRgn, int amount);
	void SigmoidBlur(Bitmap* pDst, Bitmap* pSrc, int amount);
	void FastBlur(Bitmap* pDst, Bitmap* pSrc, int amount);
	void GetPath(GraphicsPath* pPath);

	// pointer to the current Graphics object
	Graphics*	m_pGdi;

	// pointer to the current CDC object
	MemDC*		m_pDC;

	// pointer to the current layer
	OPERATION*	m_pLayer;

	// dc object holds the flattened stack
	CDC	m_dc;

	inline float Sigmoid(float x, float alpha, float beta, float gamma)
	{
		if (x <= alpha) return 0;
		if (x >= alpha && x <= beta) return 2 * (((x - alpha) / (gamma - alpha)) * ((x - alpha) / (gamma - alpha)));
		if (x >= beta && x <= gamma) return 1 - (2 * (((x - gamma) / (gamma - alpha)) * ((x - gamma) / (gamma - alpha))));
		return 1.0f;
	}

};