Style Toolkit - Use advanced graphics techniques to create a custom user interface

//
// Layers.cpp: source 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 1.1 - 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.
//
///////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Layers.h"

#include "math.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//=============================================================================
// Construction/Destruction
//=============================================================================

//=============================================================================
// empty constructor
Layers::Layers()
//=============================================================================
{
	Init();
}

//=============================================================================
// pre allocate alloc number of layers and strings
Layers::Layers(int alloc)
//=============================================================================
{
	Init(alloc);
}

//=============================================================================
// Layers Initializer
void Layers::Init(int alloc)
//=============================================================================
{
	::ZeroMemory(&Frame, sizeof(FRAME));
	m_Layers.reserve(alloc);
	m_Strings.reserve(alloc);
}

//=============================================================================
// destructor
Layers::~Layers()
//=============================================================================
{
	// delete the image objects
	for(image = m_Images.begin(); image != m_Images.end(); ++image)
	{
		if((*image).pImage) delete (*image).pImage;
	}

	// delete the region objects
	for(layer = m_Layers.begin(); layer != m_Layers.end(); ++layer)
	{
		if((*layer).pRegion) delete (*layer).pRegion;
	}
}

//=============================================================================
// copy constructor
Layers::Layers(const Layers& other)
//=============================================================================
{
	Copy(other);
}

//=============================================================================
// copy function
void Layers::Copy(const Layers& other)
//=============================================================================
{
	// copy frame
	memcpy(&Frame, &other.Frame, sizeof(FRAME));

	// Copy layers and strings
	CopyLayers(other);
}

//=============================================================================
// copy function helper
void Layers::CopyLayers(const Layers& other)
//=============================================================================
{
	// copy OPERATION
	for(clayer = other.m_Layers.begin(); clayer != other.m_Layers.end(); ++clayer)
	{
		m_Layers.push_back(*clayer);
	}

	// copy TEXTINFO
	for(cwsIter = other.m_Strings.begin(); cwsIter != other.m_Strings.end(); ++cwsIter)
	{
		m_Strings.push_back(*cwsIter);
	}

	// copy IMAGEINFO
	for(cimage = other.m_Images.begin(); cimage != other.m_Images.end(); ++cimage)
	{
		m_Images.push_back(*cimage);
	}
}

//=============================================================================
// operator =
Layers& Layers::operator=(const Layers& other)
//=============================================================================
{
	m_Layers.clear();
	m_Strings.clear();
	m_Images.clear();
	Copy(other);
	return *this;
}

//=============================================================================
void Layers::MakeFrame(SRect sr)
//=============================================================================
{
	Frame.frect = sr.rect;
	// default to rects
	Frame.OuterBorder.shape = RECTANGLE;
	Frame.MiddleBorder.shape = RECTANGLE;
	Frame.InnerBorder.shape = RECTANGLE;
	MakeFrameRgn();
}

//=============================================================================
void Layers::MakeFrameRgn()
//=============================================================================
{
	Region rgn(Frame.frect);
	Frame.clipRgn.MakeEmpty();
	Frame.clipRgn.Union(&rgn);
}

//=============================================================================
//
// AddLayer()
//
// Purpose:     Adds a layer to the stack.  A transparent layer will be created
//				and set to the Frames rect just prior to painting 
//
// Parameters:  None
//				
// Returns:     None
//
int Layers::AddLayer()
{
	OPERATION Layer;
	::ZeroMemory(&Layer, sizeof(OPERATION));

	m_Layers.push_back(Layer);
	return (int)(m_Layers.size() - 1);
}

//=============================================================================
//
// AddLayer()
//
// Purpose:     Adds a layer to the stack.  If only the rect is passed
//				a transparent layer will be created
//
// Parameters:  sr		- [in] Rect boundary of this layer
//				clr		- [in] optional - color of this layer
//				
// Returns:     None
//
int Layers::AddLayer(SRect sr, Clr clr)
{
	OPERATION Layer;
	::ZeroMemory(&Layer, sizeof(OPERATION));

	Layer.lrect = sr.rect;
	Layer.clr1 = clr.value;

	m_Layers.push_back(Layer);

	return (int)(m_Layers.size() - 1);
}

//=============================================================================
//
// SetShape()
//
// Purpose:     Sets the border style and radius
//
// Parameters:  style	- [in] the border style 
//				radius	- [in] optional - the corner radius for round borders
//				
// Returns:     None
//
void Layers::SetShape(int shape, int radius)
{
	MakeFrameRgn();
	
	// make all the borders the same
	Frame.OuterBorder.radius = radius;
	Frame.MiddleBorder.radius = radius;
	Frame.InnerBorder.radius = radius;

	Frame.OuterBorder.shape = shape;
	Frame.MiddleBorder.shape = shape;
	Frame.InnerBorder.shape = shape;

	// only the outer border can be transition
	if(shape == TRANSITION)
	{
		Frame.MiddleBorder.shape = ROUNDRECT;
		Frame.InnerBorder.shape = ROUNDRECT;
	}
}

//=============================================================================
//
// SetClipping()
//
// Purpose:     Sets the Graphics clipping region to the frames tlclr border
//
// Parameters:  None
//				
// Returns:     None
//
void Layers::SetClipping(Graphics* pGraphics)
{
	Frame.OuterBorder.SetBorderClip(pGraphics, Frame.frect);
}
//=============================================================================
//
// RestoreClipping()
//
// Purpose:     Restores the Graphics clipping region
//
// Parameters:  None
//				
// Returns:     None
//
void Layers::RestoreClipping(Graphics* pGraphics)
{
	pGraphics->ResetClip();
}

//=============================================================================
//
// PaintBorders()
//
// Purpose:     Paints the Outer, Middle and Inner borders based on the 
//				borders paramaters.
//
// Parameters:  None
//				
// Returns:     None
//
void Layers::PaintBorders()
{
	Rect bdr(Frame.frect);
	int width, ovlap; 

	if( (width = Frame.OuterBorder.width) )
	{
		ovlap = width;
		if( (Frame.MiddleBorder.shape != RECTANGLE) && (Frame.MiddleBorder.width > 0) &&
			(Frame.MiddleBorder.ulclr.GetA() == 255) ) ovlap++;
		Frame.OuterBorder.Draw(m_pGdi, bdr, Frame.OuterBorder.ulclr, Frame.OuterBorder.brclr, ovlap);
		bdr.Inflate(-width, -width);
	}

	if( (width = Frame.MiddleBorder.width) )
	{
		ovlap = width;
		if( (Frame.InnerBorder.shape != RECTANGLE) && (Frame.InnerBorder.width > 0) &&
			(Frame.InnerBorder.ulclr.GetA() == 255) ) ovlap++;
		Frame.MiddleBorder.Draw(m_pGdi, bdr, Frame.MiddleBorder.ulclr, Frame.MiddleBorder.brclr, ovlap);
		bdr.Inflate(-width, -width);
	}

	if( (width = Frame.InnerBorder.width) )
	{
		Frame.InnerBorder.Draw(m_pGdi, bdr, Frame.InnerBorder.ulclr, Frame.InnerBorder.brclr, width);
	}

}

//=============================================================================
//
// PaintLayers()
//
// Purpose:		Paints the solid or gradient base rectangle
//				The rectangle is clipped with the Frame struct
//
//=============================================================================
void Layers::PaintLayers()
{
	Color colors[3];

	if(m_pLayer->LayerType == SOLID)
	{
		SolidBrush br(m_pLayer->clr1);
		Fill(&br);
	}
	else if(m_pLayer->LayerType == TRIGRAD)
	{
		colors[0] = m_pLayer->clr1;
		colors[1] = m_pLayer->clr2;
		colors[2] = m_pLayer->clr3;

		REAL positions[] = { 0.0f, m_pLayer->rParams[0], 1.0f };

		LinearGradientMode mode = (LinearGradientMode)m_pLayer->gradMode;

		LinearGradientBrush lgbr(m_pLayer->lrect, Color::Black, Color::White, mode);
		lgbr.SetInterpolationColors(colors, positions, 3);

		Fill(&lgbr);
	}
	else if(m_pLayer->LayerType == BIGRAD)
	{
		// check center point for minus flag
		float dp = m_pLayer->rParams[0];

		colors[0] = m_pLayer->clr1;

		if(dp < 0.0f)
		{
			colors[1] = m_pLayer->clr2;
			dp = 1.0f + dp;
		}
		else
		{
			colors[1] = m_pLayer->clr1;
		}
		colors[2] = m_pLayer->clr2;

		REAL positions[] = { 0.0f, dp, 1.0f };
		
		LinearGradientMode mode = (LinearGradientMode)m_pLayer->gradMode;

		LinearGradientBrush lgbr(	m_pLayer->lrect, m_pLayer->clr1, 
									m_pLayer->clr2, mode);

		lgbr.SetWrapMode(WrapModeClamp);
		lgbr.SetInterpolationColors(colors, positions, 3);

		Fill(&lgbr);
	}
	else if(m_pLayer->LayerType == RADIAL)
	{
		GraphicsPath path;
		Rect pr = m_pLayer->lrect;

		path.AddEllipse(pr);
		path.CloseFigure();

		PathGradientBrush pgr(&path);

		int count = 1;
		Color clr = m_pLayer->clr1;
		Color t[1];	t[0] = m_pLayer->clr2; 

		pgr.SetCenterPoint( Point(pr.X + pr.Width/2, pr.Y + pr.Height/2) );
		pgr.SetSurroundColors(t, &count);
		pgr.SetCenterColor(clr);

		m_pGdi->FillPath(&pgr, &path);
	}
	else if(m_pLayer->LayerType == IMAGE)
	{
		PaintImage();
	}
	else if(m_pLayer->LayerType == STRING)
	{
		PaintString();
	}
	else if(m_pLayer->LayerType == EFFECTSTRING)
	{
		PaintEffectString();
	}
	else if(m_pLayer->LayerType >= TOP_EDGE && m_pLayer->LayerType <= BOTTOM_EDGE_BEVEL)
	{
		PaintBar();
	}
	else if(m_pLayer->LayerType == CREATERGN)
	{
		GraphicsPath path;
		GetPath(&path);
		Region rgn(&path);
		m_pLayer->pRegion = rgn.Clone();
	}
	else if(m_pLayer->LayerType == COMBINEMOD)
	{
		Region *pR0, *pR1;
		pR0 = m_Layers[m_pLayer->rgnIndex[0]].pRegion;
		pR1 = m_Layers[m_pLayer->rgnIndex[1]].pRegion;

		CombineRgns(pR0, pR1, m_pLayer->clipMode);
	}
	else if(m_pLayer->LayerType == COMBINENEW)
	{
		Region *pR0, *pR1;
		pR0 = m_Layers[m_pLayer->rgnIndex[0]].pRegion;
		pR1 = m_Layers[m_pLayer->rgnIndex[1]].pRegion;

		m_pLayer->pRegion = pR0->Clone();

		CombineRgns(m_pLayer->pRegion, pR1, m_pLayer->clipMode);
	}
	else if(m_pLayer->LayerType == APPLYCLIP)
	{
		m_pGdi->SetClip(m_Layers[m_pLayer->rgnIndex[0]].pRegion);
	}
	else if(m_pLayer->LayerType == RESTORECLIP)
	{
		Frame.OuterBorder.SetBorderClip(m_pGdi, Frame.frect);
	}
	else if(m_pLayer->LayerType == REGIONBLUR)
	{
		RegionBlur(m_Layers[m_pLayer->rgnIndex[0]].pRegion, m_pLayer->width);
	}
	else if(m_pLayer->LayerType == WRAP)
	{
		colors[0] = m_pLayer->clr1;
		colors[1] = m_pLayer->clr2;
		colors[2] = m_pLayer->clr3;

		REAL positions[] = { 0.0f, 0.5, 1.0f };

		//LinearGradientMode mode = (LinearGradientMode)m_pLayer->gradMode;
		LinearGradientMode mode = (LinearGradientMode)HORIZ;

		Rect sr = m_pLayer->lrect; sr.Width = m_pLayer->width;
		LinearGradientBrush lgbr(sr, Color::Black, Color::White, mode);
		lgbr.SetInterpolationColors(colors, positions, 3);

		Fill(&lgbr);
	}
	else if(m_pLayer->LayerType == SETSMOOTH)
	{
		SmoothingMode sm = SmoothingMode(m_pLayer->clipMode);
		m_pGdi->SetSmoothingMode(sm);
	}
	else if(m_pLayer->LayerType == RESTORESMOOTH)
	{
		// this is the default smoothing mode
		m_pGdi->SetSmoothingMode(SmoothingModeAntiAlias);
	}
	else if(m_pLayer->LayerType == APPLYXFORM)
	{
		Transform(m_pLayer->gradMode);
	}
	
}

//
// fills based on the layer shape
//
void Layers::Fill(Brush* pBrush)
{
	Rect r = m_pLayer->lrect;
	int style = Frame.OuterBorder.shape;

	if(style == RECTANGLE)
	{
		m_pGdi->FillRectangle(pBrush, r);
	}
	else if(style == ELLIPSE)
	{
		m_pGdi->FillEllipse(pBrush, r);
	}
	else if( (style == ROUNDRECT) || (style == TRANSITION) )
	{
		Color brdr = m_pLayer->clr1;
		int radius = Frame.OuterBorder.radius;

		Frame.OuterBorder.FillRoundRect(m_pGdi, pBrush, r, brdr, radius);
	}
}

//
// Get a path based on the layer shape
//
void Layers::GetPath(GraphicsPath *pPath)
{
	if(m_pLayer->LayerShape == RECTANGLE)
	{
		pPath->AddRectangle(m_pLayer->lrect);
	}
	else if(m_pLayer->LayerShape == ELLIPSE)
	{
		pPath->AddEllipse(m_pLayer->lrect);
	}
	else if(m_pLayer->LayerShape == ROUNDRECT)
	{
		Frame.OuterBorder.GetRoundRectPath(pPath, m_pLayer->lrect);
	}
}

//
//	CombineRgns()
//	
void Layers::CombineRgns(Region* pRgn1, Region* pRgn2, int mode)
{
	if(m_pLayer->clipMode == INTERSECT)
	{
		pRgn1->Intersect(pRgn2);
	}
	else if(m_pLayer->clipMode == UNION)
	{
		pRgn1->Union(pRgn2);
	}
	else if(m_pLayer->clipMode == XOR)
	{
		pRgn1->Xor(pRgn2);
	}
	else if(m_pLayer->clipMode == EXCLUDE)
	{
		pRgn1->Exclude(pRgn2);
	}
	else if(m_pLayer->clipMode == COMPLEMENT)
	{
		pRgn1->Complement(pRgn2);
	}
}

void Layers::RegionBlur(Region* pRgn, int amount)
{
	// blur the frame rect
	Rect rc = Frame.frect;

	// size for bitmaps
	int width = rc.Width;
	int height = rc.Height;

   	// move rect to origin for bitmaps
	Rect bmrc = rc;	bmrc.X = 0; bmrc.Y = 0;

	// create a bitmap for src data
	Bitmap sbm(width, height);
	// create a bitmap for dst data
	Bitmap dbm(width, height);

	// create a graphics object
	Graphics gr(&sbm);

	// fill the region
	pRgn->Translate(-rc.X, -rc.Y);
	gr.SetClip(pRgn);
	SolidBrush gbr(m_pLayer->clr1);
	gr.FillRectangle(&gbr, bmrc);
	gr.ResetClip();

	// call blur function
	SigmoidBlur(&dbm, &sbm, amount);
  
	// draw image
	m_pGdi->DrawImage(&dbm, rc, 0, 0, width, height, UnitPixel);
}

//
// This is an optimized version of the blur method from
// this article: http://www.codeproject.com/KB/GDI-plus/aqualize.aspx
//
// Use this function with caution! As the bitmap size and blur amount
// increase, so will the computation time.
//
void Layers::SigmoidBlur(Bitmap* pDst, Bitmap* pSrc, int boxw)
{
	int width = pSrc->GetWidth();
	int height = pSrc->GetHeight();

	// these bitmpas need to be the same size
	ASSERT(width == pDst->GetWidth() && height == pSrc->GetHeight());

	Rect bmrc(0, 0, width, height);

	// lock the src bits
	BitmapData sbmData;
	pSrc->LockBits(&bmrc, ImageLockModeWrite | ImageLockModeRead, PixelFormat32bppARGB, &sbmData);

	// access variables
	int line = sbmData.Stride/4;
	UINT32* src = (UINT32*)sbmData.Scan0;

	// lock the dst bits 
	BitmapData dbmData;
	pDst->LockBits(&bmrc, ImageLockModeWrite | ImageLockModeRead, PixelFormat32bppARGB, &dbmData);
	UINT32* dst = (UINT32*)dbmData.Scan0;

	float a, r, g, b, weight, weightsum;
	UINT32 ia, ir, ig, ib, c;

	float* weights = new float[2*boxw+1];

	weights[boxw] = 1.0f;

	for(int i = 0; i < boxw; i++) 
	{
		float y = Sigmoid((float)i, 0.0f, (float)((boxw + 1)/2), (float)(boxw + 1));
		weights[i] = y;
		weights[boxw * 2 - i] = y;
	}

	// horizontal blur
	for (int row = 0; row < height; row++) 
	{
		for (int col = 0; col < width; col++) 
		{
			r = 0; g = 0; b = 0; a = 0; weightsum = 0;

			for (int i = 0; i < boxw * 2 + 1; i++) 
			{
				int x = col - boxw + i;
				if (x < 0) 
				{
					i += -x;
					x = 0;
				}
				if (x > width - 1)
					break;

				c = src[x + row*line];

				weight = weights[i];
				a += ((c >> 24) & 0x000000FF) * weight;
				r += ((c >> 16) & 0x000000FF) * weight;
				g += ((c >>  8) & 0x000000FF) * weight;
				b += ((c >>  0) & 0x000000FF) * weight;
				weightsum += weight;
			}

			ia = min((UINT32)(a/weightsum), 255);
			ir = min((UINT32)(r/weightsum), 255);
			ig = min((UINT32)(g/weightsum), 255);
			ib = min((UINT32)(b/weightsum), 255);

			dst[col + row*line] = ((ia<<24) | (ir<<16) | (ig<<8) | (ib<<0));
		}
	}

	// vertical blur
	for (int col = 0; col < width; col++) 
	{
		for (int row = 0; row < height; row++) 
		{
			r = 0; g = 0; b = 0; a = 0; weightsum = 0;

			for (int i = 0; i < boxw * 2 + 1; i++) 
			{
				int y = row - boxw + i;
				if (y < 0) 
				{
					i += -y;
					y = 0;
				}
				if (y > height - 1)
					break;

				c = dst[col + y * line];

				weight = weights[i];
				a += ((c >> 24) & 0x000000FF) * weight;
				r += ((c >> 16) & 0x000000FF) * weight;
				g += ((c >>  8) & 0x000000FF) * weight;
				b += ((c >>  0) & 0x000000FF) * weight;
				weightsum += weight;
			}

			ia = min((UINT32)(a/weightsum), 255);
			ir = min((UINT32)(r/weightsum), 255);
			ig = min((UINT32)(g/weightsum), 255);
			ib = min((UINT32)(b/weightsum), 255);

			dst[col + row*line] = ((ia<<24) | (ir<<16) | (ig<<8) | (ib<<0));
		}
	}

	pDst->UnlockBits(&dbmData);
	pSrc->UnlockBits(&sbmData);

	delete [] weights;
}

//
// This blur method uses a constant weight for the sliding
// box, which makes the calculation independant of the box
// size.  Also only the endpoints need to be calculated as
// the box slides.  This makes the algorithm much faster,
// but it doesn't look as nice as the SigmoidBlur.
//
void Layers::FastBlur(Bitmap* pDst, Bitmap* pSrc, int boxw)
{
	// this function is not finished :)
	ASSERT(FALSE);
#if 0
	// the approach is here
	// http://www.gamasutra.com/features/20010209/Listing3.cpp

	int width = pSrc->GetWidth();
	int height = pSrc->GetHeight();

	// these bitmpas need to be the same size
	ASSERT(width == pDst->GetWidth() && height == pSrc->GetHeight());

	Rect bmrc(0, 0, width, height);

	// lock the src bits
	BitmapData sbmData;
	pSrc->LockBits(&bmrc, ImageLockModeWrite | ImageLockModeRead, PixelFormat32bppARGB, &sbmData);

	// access variables
	int line = sbmData.Stride/4;
	UINT32* src = (UINT32*)sbmData.Scan0;

	// lock the dst bits 
	BitmapData dbmData;
	pDst->LockBits(&bmrc, ImageLockModeWrite | ImageLockModeRead, PixelFormat32bppARGB, &dbmData);
	UINT32* dst = (UINT32*)dbmData.Scan0;

	float a, r, g, b, weight, weightsum;
	UINT32 ia, ir, ig, ib, c, alpha;

	if (boxw >= width) boxw = width-1;

	weightsum = 2*boxw + 1;

	for(int row = 0; row < height; row++)
	{
		//int tot=0;
		r = 0; g = 0; b = 0; a = 0; //weightsum = 0;

		for(int col = 0; col < boxw; col++)
		{
			// tot += src[col];

			c = src[col + row*line];

			a += ((c >> 24) & 0x000000FF);
			r += ((c >> 16) & 0x000000FF);
			g += ((c >>  8) & 0x000000FF);
			b += ((c >>  0) & 0x000000FF);
		}

		for(int col = 0; col < width; col++)
		{
			if( col > boxw)
			{	
				// tot -= src[-boxw-1];

				c = src[(col-boxw-1) + row*line];

				a -= ((c >> 24) & 0x000000FF);
				r -= ((c >> 16) & 0x000000FF);
				g -= ((c >>  8) & 0x000000FF);
				b -= ((c >>  0) & 0x000000FF);
			}

			if( (col + boxw) < width)
			{
				// tot += src[boxw];

				c = src[boxw + row*line];

				a += ((c >> 24) & 0x000000FF);
				r += ((c >> 16) & 0x000000FF);
				g += ((c >>  8) & 0x000000FF);
				b += ((c >>  0) & 0x000000FF);

				alpha = ((c >> 24) & 0x000000FF);
				r = alpha * r/255.0f;
				g = alpha * g/255.0f;
				b = alpha * b/255.0f;
			}
			
			//*dst++ = UINT(tot*mul);

			ia = min((UINT32)(a/weightsum), 255);
			ir = min((UINT32)(r/weightsum), 255);
			ig = min((UINT32)(g/weightsum), 255);
			ib = min((UINT32)(b/weightsum), 255);

			UINT32 clr = ((ia<<24) | (ir<<16) | (ig<<8) | (ib<<0));

			if(clr == 0xff000000)
				int tmp=1;

			dst[col + row*line] = clr;
			
			//src++;
		}
	}	

	pDst->UnlockBits(&dbmData);
	pSrc->UnlockBits(&sbmData);
#endif
}

//=============================================================================
//
// PaintBar()
//
// Purpose:		Paints a bar at the edge of a frame
//
//=============================================================================
void Layers::PaintBar()
{
	// various modes leave artifacts
	SmoothingMode oldMode = m_pGdi->GetSmoothingMode();
	m_pGdi->SetSmoothingMode(SmoothingModeNone);

	LinearGradientMode gtype;

	Rect rc = m_pLayer->lrect;
	int type = m_pLayer->LayerType; 
	int ewidth = m_pLayer->width;

	GraphicsPath path;

	if(type == LEFT_EDGE  || type == LEFT_EDGE_BEVEL)
	{
		gtype = (LinearGradientMode)HORIZ;
		rc.Width = ewidth;

		if(type == LEFT_EDGE)
		{	
			path.AddRectangle(rc);
		}
		else
		{
			Point corners[] = { Point(rc.X, rc.Y), 
								Point(rc.X + ewidth, rc.Y + ewidth),
								Point(rc.X + ewidth, rc.Y + rc.Height - ewidth),
								Point(rc.X, rc.Y + rc.Height) };
			
			path.AddPolygon(corners, 4);
		}
	}
	else if(type == TOP_EDGE || type == TOP_EDGE_BEVEL)
	{
		gtype = (LinearGradientMode)VERT;
		rc.Height = ewidth;

		if(type == TOP_EDGE)
		{	
			path.AddRectangle(rc);
		}
		else
		{
			Point corners[] = { Point(rc.X, rc.Y), 
								Point(rc.X + rc.Width, rc.Y),
								Point(rc.X + rc.Width - ewidth, rc.Y + ewidth),
								Point(rc.X + ewidth, rc.Y + ewidth) };
			
			path.AddPolygon(corners, 4);
		}
	}
	else if(type == RIGHT_EDGE || type == RIGHT_EDGE_BEVEL)
	{
		gtype = (LinearGradientMode)HORIZ;
		rc.X = rc.X + rc.Width - ewidth;
		rc.Width = ewidth;

		if(type == RIGHT_EDGE)
		{	
			path.AddRectangle(rc);
		}
		else
		{
			Point corners[] = { Point(rc.X, rc.Y + ewidth), 
								Point(rc.X + rc.Width, rc.Y),
								Point(rc.X + rc.Width, rc.Y + rc.Height),
								Point(rc.X, rc.Y + rc.Height - ewidth) };
			
			path.AddPolygon(corners, 4);
		}
	}
	else if(type == BOTTOM_EDGE || type == BOTTOM_EDGE_BEVEL)
	{
		gtype = (LinearGradientMode)VERT;
		rc.Y = rc.Y + rc.Height - ewidth;
		rc.Height = ewidth;

		if(type == BOTTOM_EDGE)
		{	
			path.AddRectangle(rc);
		}
		else
		{
			Point corners[] = { Point(rc.X + ewidth, rc.Y), 
								Point(rc.X + rc.Width - ewidth, rc.Y),
								Point(rc.X + rc.Width, rc.Y + rc.Height),
								Point(rc.X, rc.Y + rc.Height) };
			
			path.AddPolygon(corners, 4);
		}
	}

	Color colors[5];
	colors[0] = m_pLayer->clr1;
	colors[1] = m_pLayer->clr2;
	colors[2] = m_pLayer->clr3;

	LinearGradientBrush lgbr(rc, colors[0], colors[2], gtype);

	// the extra interpolation point appears to get rid of some artifacts
	if(m_pLayer->rParams[1] != NULL)
	{
		float profile[3];
		profile[0] = m_pLayer->rParams[0];
		profile[1] = m_pLayer->rParams[1];
		profile[2] = m_pLayer->rParams[2];

		lgbr.SetInterpolationColors(colors, profile, 3);
	}

	// relies on clipping region for round rects
	m_pGdi->FillPath(&lgbr, &path);

	m_pGdi->SetSmoothingMode(oldMode);
}

//=============================================================================
//
// PaintString()
//
// Purpose:     Draws the strings
//
//=============================================================================
void Layers::PaintString()
{
	TEXTINFO* pTI = &m_Strings[m_pLayer->strIndex];

	Font font(pTI->fname, (float)pTI->fsize, pTI->fstyle, UnitPixel);
	SolidBrush br(m_pLayer->clr1);

	RectF rf = MakeRectF(m_pLayer->lrect);

	// add in any offset
	rf.X += pTI->foffset.X;
	rf.Y += pTI->foffset.Y;
	rf.Width -= pTI->foffset.X;
	rf.Height -= pTI->foffset.Y;

	StringFormat sf;
	if(pTI->align == ALIGN_NEAR)
	{
		sf.SetAlignment(StringAlignmentNear);
		sf.SetLineAlignment(StringAlignmentNear);
	}
	else if (pTI->align == ALIGN_CENTER)
	{
		sf.SetAlignment(StringAlignmentCenter);
		sf.SetLineAlignment(StringAlignmentCenter);
	}
	else if (pTI->align == ALIGN_FAR)
	{
		sf.SetAlignment(StringAlignmentFar);
		sf.SetLineAlignment(StringAlignmentFar);
	}

	m_pGdi->DrawString(pTI->string.c_str(), -1, &font, rf, &sf, &br);
}


//=============================================================================
//
// PaintEffectString()
//
// Purpose:     Draws the strings
//
//=============================================================================
void Layers::PaintEffectString()
{
	TEXTINFO* pTI = &m_Strings[m_pLayer->strIndex];

	Font font(pTI->fname, (float)pTI->fsize, pTI->fstyle, UnitPixel);
	SolidBrush br(m_pLayer->clr1);

	WCHAR* wstr = (WCHAR*)pTI->string.c_str();

	SolidBrush br2(m_pLayer->clr2);

	PointF pt(pTI->foffset.X + m_pLayer->lrect.X, pTI->foffset.Y + m_pLayer->lrect.Y);

	if(m_pLayer->rParams[0] == OUTLINE)
	{
		int width = (int)m_pLayer->rParams[1]; 
		int span = 2*width + 1;

		GraphicsPath path;
		StringFormat sf;
		FontFamily ff(pTI->fname);

		path.SetFillMode(FillModeWinding);

		for(int x = 0; x < span; x++)
		{
			for(int y = 0; y < span; y++)
			{
				PointF dp(pt.X + x - width, pt.Y + y - width);
				m_pGdi->DrawString(wstr, -1, &font, dp, &br2);
			}
		}

		// draw face
		m_pGdi->DrawString(wstr, -1, &font, pt, &br);
	}
}


//=============================================================================
//
// PaintImage()
//
// Purpose:     Draws the image set by SetImage
//
//=============================================================================
void Layers::PaintImage()
{

	IMAGEINFO* pII = &m_Images[m_pLayer->imgIndex];

	pII->pImage = new GResource;

	RectF srcF, destF, paneF; Unit unit; 

	// convert pane offset point to float
	PointF dptF((float)pII->destpt.X, (float)pII->destpt.Y);

	// convert src offset point to float
	PointF sptF((float)pII->srcpt.X, (float)pII->srcpt.Y);

	// convert pane rect to float
	Rect rc = Frame.frect;
	paneF.X = (float)rc.X; paneF.Y = (float)rc.Y;
	paneF.Width = (float)rc.Width; paneF.Height = (float)rc.Height;

	if( pII->pImage->Load(pII->resID, pII->resType) )
	{
		// get image dimensions
		pII->pImage->m_pBitmap->GetBounds(&srcF, &unit);

		// offset into src
		srcF.Offset(sptF); srcF.Width -= sptF.X; srcF.Height -= sptF.Y;
		
		// destination is pane rect + destpt offset
		destF = paneF; destF.Offset(dptF);

		// if src is smaller, adjust dest
		if(destF.Width > srcF.Width) destF.Width = srcF.Width;
		if(destF.Height > srcF.Height) destF.Height = srcF.Height;

		// if dest is smaller and clipping is on, adjust src
		if(pII->clip == TRUE)
		{
			if(srcF.Width > destF.Width) srcF.Width = destF.Width;
			if(srcF.Height > destF.Height) srcF.Height = destF.Height;
		}

		if(pII->xform == NOXFORM)
		{
			m_pGdi->DrawImage(*pII->pImage, destF, srcF.X, srcF.Y, srcF.Width, srcF.Height, unit);
		}
		else if(pII->xform == LIGHTEN)
		{
			ColorMatrix HotMat = {	1.05f, 0.00f, 0.00f, 0.00f, 0.00f,
									0.00f, 1.05f, 0.00f, 0.00f, 0.00f,
									0.00f, 0.00f, 1.05f, 0.00f, 0.00f,
									0.00f, 0.00f, 0.00f, 1.00f, 0.00f,
									0.05f, 0.05f, 0.05f, 0.00f, 1.00f	};

			ImageAttributes ia;
			ia.SetColorMatrix(&HotMat);

			m_pGdi->DrawImage(*pII->pImage, destF, srcF.X, srcF.Y, srcF.Width, srcF.Height, unit, &ia);
		}
		else if(pII->xform == GRAYSCALE)
		{
			ColorMatrix GrayMat = {	0.30f, 0.30f, 0.30f, 0.00f, 0.00f,
									0.59f, 0.59f, 0.59f, 0.00f, 0.00f,
									0.11f, 0.11f, 0.11f, 0.00f, 0.00f,
									0.00f, 0.00f, 0.00f, 1.00f, 0.00f,
									0.00f, 0.00f, 0.00f, 0.00f, 1.00f	};

			ImageAttributes ia;
			ia.SetColorMatrix(&GrayMat);

			m_pGdi->DrawImage(*pII->pImage, destF, srcF.X, srcF.Y, srcF.Width, srcF.Height, unit, &ia);
		}
	}
}

void Layers::Transform(int xform)
{
	Rect r = m_pLayer->lrect;

	Bitmap *pBmp = m_pDC->GetBitmap();

	if(xform == LIGHTEN)
	{
		ColorMatrix HotMat = {	1.05f, 0.00f, 0.00f, 0.00f, 0.00f,
								0.00f, 1.05f, 0.00f, 0.00f, 0.00f,
								0.00f, 0.00f, 1.05f, 0.00f, 0.00f,
								0.00f, 0.00f, 0.00f, 1.00f, 0.00f,
								0.05f, 0.05f, 0.05f, 0.00f, 1.00f	};

		ImageAttributes ia;
		ia.SetColorMatrix(&HotMat);
	
		m_pGdi->DrawImage((Image*)pBmp, r, 0, 0, r.Width, r.Height, UnitPixel, &ia);
	}
	else if(xform == GRAYSCALE)
	{
		ColorMatrix GrayMat = {	0.30f, 0.30f, 0.30f, 0.00f, 0.00f,
								0.59f, 0.59f, 0.59f, 0.00f, 0.00f,
								0.11f, 0.11f, 0.11f, 0.00f, 0.00f,
								0.00f, 0.00f, 0.00f, 1.00f, 0.00f,
								0.00f, 0.00f, 0.00f, 0.00f, 1.00f	};

		ImageAttributes ia;
		ia.SetColorMatrix(&GrayMat);
	
		m_pGdi->DrawImage((Image*)pBmp, r, 0, 0, r.Width, r.Height, UnitPixel, &ia);
	}

	delete pBmp;
}

//=============================================================================
//
// Regenerate
//
// Purpose:		Marks the stack to be regenerated on the next paint operation.
//				If a layer index is passed, it will reset all of the layer rects
//				above and including the index to zero, causing them to be 
//				recalcculated from the frame rect
//
// Parameters:  x	- [in] the x offset
//				y	- [in] the y offset
//				
// Returns:     None
//
void Layers::Regenerate(int layerIdx)
{
	Frame.bUseBitmap = FALSE;

	if(layerIdx != -1)
	{
		for(layer = m_Layers.begin() + layerIdx; layer != m_Layers.end(); ++layer)
		{
			(*layer).lrect.Width = 0; (*layer).lrect.Height = 0;
		}
	}
}

//=============================================================================
//
// PaintStack()
//
// Procedure:	1.  Create the borders and clipping region
//				2.  Paint all the layers into the device context
//				3.  Flatten the layers into a bitmap
//
//=============================================================================
void Layers::PaintStack(MemDC* pDC, Graphics* pGraphics)
{
	// the Frame must have a rect
	ASSERT(!(Frame.frect.Width == 0 && Frame.frect.Height == 0));

	// set the Graphics object
	m_pGdi = pGraphics;

	// set the MemDC object
	m_pDC = pDC;

	// set clip region
	SetClipping(m_pGdi);

	for(layer = m_Layers.begin(); layer != m_Layers.end(); ++layer)
	{
		// pointer to this layer
		m_pLayer = &(*layer);

		// if the layer rect is not defined, it uses the Frame rect
		if( (m_pLayer->lrect.Width == 0) && (m_pLayer->lrect.Height == 0) )
		{
			m_pLayer->lrect = Frame.frect;
		}

		if(m_pLayer->LayerShape == UNDEFINED)
		{
			m_pLayer->LayerShape = Frame.OuterBorder.shape;
		}

		// paint the layer
		PaintLayers();
	}

	// restore the clip region
	RestoreClipping(m_pGdi);

	// paint the borders
	PaintBorders();

	// delete dc in case of regeneration
	m_dc.DeleteDC();

	int x		= Frame.frect.X;
	int y		= Frame.frect.Y;
	int width	= Frame.frect.Width; 
	int height	= Frame.frect.Height;

	// store into m_dc
	CBitmap bmp;
	m_dc.CreateCompatibleDC(pDC);
	bmp.CreateCompatibleBitmap(pDC, width, height);
	m_dc.SelectObject(&bmp);
	m_dc.BitBlt(0, 0, width, height, pDC, x, y, SRCCOPY);
	bmp.DeleteObject();

	Frame.bUseBitmap = TRUE;
}