看到迅雷啊qq啊都实现了窗口的周围有一层毛边的玻璃背景,使原本单调的背景变的好看多了，就想着怎么做了，终于在codeproject上找到了一个外国老写的WndShadow类的，他主要是通过setwindowlong来获取到主窗口的消息。如窗口移动，缩小，变大等，获取消息做相应处理,是的背景窗口能一直与主窗口同步。
以下是代码：
// WndShadow.h : header file
//
// Version 0.3
//
// Copyright (c) 2006-2007 Mingliang Zhu, All Rights Reserved.
//
// mailto:perry@live.com
//
//
// This source file may be redistributed unmodified by any means PROVIDING
// it is NOT sold for profit without the authors expressed written
// consent, and providing that this notice and the author's name and all
// copyright notices remain intact. This software is by no means to be
// included as part of any third party components library, or as part any
// development solution that offers MFC extensions that are sold for profit.
//
// If the source code is used in any commercial applications then a statement
// along the lines of:
// "Portions Copyright (c) 2006-2007 Mingliang Zhu"
// must be included in the "Startup Banner", "About Box" or "Printed
// Documentation". This software is provided "as is" without express or
// implied warranty. Use it at your own risk! The author accepts no
// liability for any damage/loss of business that this product may cause.
//
/////////////////////////////////////////////////////////////////////////////
//****************************************************************************
//****************************************************************************
// Update history--
//
// Version 0.3, 2007-06-14
// -The shadow is made Windows Vista Aero awareness.
// -Fixed a bug that causes the shadow to appear abnormally on Windows Vista.
// -Fixed a bug that causes the shadow to appear abnormally if parent window
// is initially minimized or maximized
//
// Version 0.2, 2006-11-23
// -Fix a critical issue that may make the shadow fail to work under certain
// conditions, e.g., on Win2000, on WinXP or Win2003 without the visual
// theme enabled, or when the frame window does not have a caption bar.
//
// Version 0.1, 2006-11-10
// -First release
//****************************************************************************
#pragma once
#pragma warning(push)
#pragma warning(disable:4786)
#include "map"
#pragma warning(pop)
class CWndShadow
{
public:
CWndShadow(void);
public:
virtual ~CWndShadow(void);
protected:
// Instance handle, used to register window class and create window
static HINSTANCE s_hInstance;
#pragma warning(push)
#pragma warning(disable:4786)
// Parent HWND and CWndShadow object pares, in order to find CWndShadow in ParentProc()
static std::map s_Shadowmap;
#pragma warning(pop)
// Layered window APIs
typedef BOOL (WINAPI *pfnUpdateLayeredWindow)(HWND hWnd, HDC hdcDst, POINT *pptDst,
SIZE *psize, HDC hdcSrc, POINT *pptSrc, COLORREF crKey,
BLENDFUNCTION *pblend, DWORD dwFlags);
static pfnUpdateLayeredWindow s_UpdateLayeredWindow;
// Vista compatibility APIs
static bool s_bVista; // Whether running on Win Vista
typedef HRESULT (WINAPI *pfnDwmIsCompositionEnabled)(BOOL *pfEnabled);
static pfnDwmIsCompositionEnabled s_DwmIsCompositionEnabled;
HWND m_hWnd;
LONG m_OriParentProc; // Original WndProc of parent window
enum ShadowStatus
{
SS_ENABLED = 1, // Shadow is enabled, if not, the following one is always false
SS_VISABLE = 1 << 1, // Shadow window is visible
SS_PARENTVISIBLE = 1<< 2, // Parent window is visible, if not, the above one is always false
SS_DISABLEDBYAERO = 1 << 3 // Shadow is enabled, but do not show because areo is enabled
};
BYTE m_Status;
unsigned char m_nDarkness; // Darkness, transparency of blurred area
unsigned char m_nSharpness; // Sharpness, width of blurred border of shadow window
signed char m_nSize; // Shadow window size, relative to parent window size
// The X and Y offsets of shadow window,
// relative to the parent window, at center of both windows (not top-left corner), signed
signed char m_nxOffset;
signed char m_nyOffset;
// Restore last parent window size, used to determine the update strategy when parent window is resized
LPARAM m_WndSize;
// Set this to true if the shadow should not be update until next WM_PAINT is received
bool m_bUpdate;
COLORREF m_Color; // Color of shadow
public:
static bool Initialize(HINSTANCE hInstance);
void Create(HWND hParentWnd);
bool SetSize(int NewSize = 0);
bool SetSharpness(unsigned int NewSharpness = 5);
bool SetDarkness(unsigned int NewDarkness = 200);
bool SetPosition(int NewXOffset = 5, int NewYOffset = 5);
bool SetColor(COLORREF NewColor = 0);
bool DestroyShadow();
protected:
//static LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static LRESULT CALLBACK ParentProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
// Redraw, resize and move the shadow
// called when window resized or shadow properties changed, but not only moved without resizing
void Update(HWND hParent);
// Fill in the shadow window alpha blend bitmap with shadow image pixels
void MakeShadow(UINT32 *pShadBits, HWND hParent, RECT *rcParent);
// Helper to calculate the alpha-premultiled value for a pixel
inline DWORD PreMultiply(COLORREF cl, unsigned char nAlpha)
{
// It's strange that the byte order of RGB in 32b BMP is reverse to in COLORREF
return (GetRValue(cl) * (DWORD)nAlpha / 255) << 16 |
(GetGValue(cl) * (DWORD)nAlpha / 255) << 8 |
(GetBValue(cl) * (DWORD)nAlpha / 255);
}
// Show or hide the shadow, depending on the enabled status stored in m_Status
void Show(HWND hParent);
};
//end of head file
// WndShadow.h : header file
//
// Version 0.3
//
// Copyright (c) 2006-2007 Mingliang Zhu, All Rights Reserved.
//
// mailto:perry@live.com
//
//
// This source file may be redistributed unmodified by any means PROVIDING
// it is NOT sold for profit without the authors expressed written
// consent, and providing that this notice and the author's name and all
// copyright notices remain intact. This software is by no means to be
// included as part of any third party components library, or as part any
// development solution that offers MFC extensions that are sold for profit.
//
// If the source code is used in any commercial applications then a statement
// along the lines of:
// "Portions Copyright (c) 2006-2007 Mingliang Zhu"
// must be included in the "Startup Banner", "About Box" or "Printed
// Documentation". This software is provided "as is" without express or
// implied warranty. Use it at your own risk! The author accepts no
// liability for any damage/loss of business that this product may cause.
//
/////////////////////////////////////////////////////////////////////////////
//****************************************************************************
//****************************************************************************
// Update history--
//
// Version 0.3, 2007-06-14
// -The shadow is made Windows Vista Aero awareness.
// -Fixed a bug that causes the shadow to appear abnormally on Windows Vista.
// -Fixed a bug that causes the shadow to appear abnormally if parent window
// is initially minimized or maximized
//
// Version 0.2, 2006-11-23
// -Fix a critical issue that may make the shadow fail to work under certain
// conditions, e.g., on Win2000, on WinXP or Win2003 without the visual
// theme enabled, or when the frame window does not have a caption bar.
//
// Version 0.1, 2006-11-10
// -First release
//****************************************************************************
#include "StdAfx.h"
#include "WndShadow.h"
#include "math.h"
#include "crtdbg.h"
// Some extra work to make this work in VC++ 6.0
// walk around the for iterator scope bug of VC++6.0
#ifdef _MSC_VER
#if _MSC_VER == 1200
#define for if(false);else for
#endif
#endif
// Some definitions for VC++ 6.0 without newest SDK
#ifndef WS_EX_LAYERED
#define WS_EX_LAYERED 0x00080000
#endif
#ifndef AC_SRC_ALPHA
#define AC_SRC_ALPHA 0x01
#endif
#ifndef ULW_ALPHA
#define ULW_ALPHA 0x00000002
#endif
// Vista aero related message
#ifndef WM_DWMCOMPOSITIONCHANGED
#define WM_DWMCOMPOSITIONCHANGED 0x031E
#endif
CWndShadow::pfnUpdateLayeredWindow CWndShadow::s_UpdateLayeredWindow = NULL;
bool CWndShadow::s_bVista = false;
CWndShadow::pfnDwmIsCompositionEnabled CWndShadow::s_DwmIsCompositionEnabled = NULL;
const TCHAR *strWndClassName = _T("PerryShadowWnd");
HINSTANCE CWndShadow::s_hInstance = (HINSTANCE)INVALID_HANDLE_VALUE;
#pragma warning(push)
#pragma warning(disable:4786)
std::map CWndShadow::s_Shadowmap;
#pragma warning(pop)
CWndShadow::CWndShadow(void)
: m_hWnd((HWND)INVALID_HANDLE_VALUE)
, m_OriParentProc(NULL)
, m_nDarkness(150)
, m_nSharpness(5)
, m_nSize(0)
, m_nxOffset(5)
, m_nyOffset(5)
, m_Color(RGB(0, 0, 0))
, m_WndSize(0)
, m_bUpdate(false)
{
}
CWndShadow::~CWndShadow(void)
{
}
bool CWndShadow::Initialize(HINSTANCE hInstance)
{
// Should not initiate more than once
if (NULL != s_UpdateLayeredWindow)
return false;
HMODULE hSysDll = LoadLibrary(_T("USER32.DLL"));
s_UpdateLayeredWindow =
(pfnUpdateLayeredWindow)GetProcAddress(hSysDll,
"UpdateLayeredWindow");
// If the import did not succeed, probably layered window is not supported by current OS
if (NULL == s_UpdateLayeredWindow)
return false;
hSysDll = LoadLibrary(_T("dwmapi.dll"));
if(hSysDll) // Loaded dwmapi.dll succefull, must on Vista or above
{
s_bVista = true;
s_DwmIsCompositionEnabled =
(pfnDwmIsCompositionEnabled)GetProcAddress(hSysDll,
"DwmIsCompositionEnabled");
}
// Store the instance handle
s_hInstance = hInstance;
// Register window class for shadow window
WNDCLASSEX wcex;
memset(&wcex, 0, sizeof(wcex));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = DefWindowProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = strWndClassName;
wcex.hIconSm = NULL;
RegisterClassEx(&wcex);
return true;
}
void CWndShadow::Create(HWND hParentWnd)
{
// Do nothing if the system does not support layered windows
if(NULL == s_UpdateLayeredWindow)
return;
// Already initialized
_ASSERT(s_hInstance != INVALID_HANDLE_VALUE);
// Add parent window - shadow pair to the map
_ASSERT(s_Shadowmap.find(hParentWnd) == s_Shadowmap.end()); // Only one shadow for each window
s_Shadowmap[hParentWnd] = this;
// Create the shadow window
m_hWnd = CreateWindowEx(WS_EX_LAYERED | WS_EX_TRANSPARENT, strWndClassName, NULL,
/*WS_VISIBLE | WS_CAPTION | */WS_POPUPWINDOW,
CW_USEDEFAULT, 0, 0, 0, hParentWnd, NULL, s_hInstance, NULL);
// Determine the initial show state of shadow according to Aero
m_Status = SS_ENABLED; // Enabled by default
BOOL bAero = FALSE;
if(s_DwmIsCompositionEnabled)
s_DwmIsCompositionEnabled(&bAero);
if (bAero)
m_Status |= SS_DISABLEDBYAERO;
Show(hParentWnd); // Show the shadow if conditions are met
// Replace the original WndProc of parent window to steal messages
m_OriParentProc = GetWindowLong(hParentWnd, GWL_WNDPROC);
#pragma warning(disable: 4311) // temporrarily disable the type_cast warning in Win32
SetWindowLong(hParentWnd, GWL_WNDPROC, (LONG)ParentProc);
#pragma warning(default: 4311)
}
LRESULT CALLBACK CWndShadow::ParentProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
_ASSERT(s_Shadowmap.find(hwnd) != s_Shadowmap.end()); // Shadow must have been attached
CWndShadow *pThis = s_Shadowmap[hwnd];
#pragma warning(disable: 4312) // temporrarily disable the type_cast warning in Win32
// Call the default(original) window procedure for other messages or messages processed but not returned
WNDPROC pDefProc = (WNDPROC)pThis->m_OriParentProc;
#pragma warning(default: 4312)
switch(uMsg)
{
case WM_MOVE:
if(pThis->m_Status & SS_VISABLE)
{
RECT WndRect;
GetWindowRect(hwnd, &WndRect);
SetWindowPos(pThis->m_hWnd, 0,
WndRect.left + pThis->m_nxOffset - pThis->m_nSize, WndRect.top + pThis->m_nyOffset - pThis->m_nSize,
0, 0, SWP_NOSIZE | SWP_NOACTIVATE);
}
break;
case WM_SIZE:
if(pThis->m_Status & SS_ENABLED && !(pThis->m_Status & SS_DISABLEDBYAERO))
{
if(SIZE_MAXIMIZED == wParam || SIZE_MINIMIZED == wParam)
{
ShowWindow(pThis->m_hWnd, SW_HIDE);
pThis->m_Status &= ~SS_VISABLE;
}
else
{
LONG lParentStyle = GetWindowLong(hwnd, GWL_STYLE);
if(WS_VISIBLE & lParentStyle) // Parent may be resized even if invisible
{
pThis->m_Status |= SS_PARENTVISIBLE;
if(!(pThis->m_Status & SS_VISABLE))
{
pThis->m_Status |= SS_VISABLE;
// Update before show, because if not, restore from maximized will
// see a glance misplaced shadow
pThis->Update(hwnd);
ShowWindow(pThis->m_hWnd, SW_SHOWNA);
// If restore from minimized, the window region will not be updated until WM_PAINT:(
pThis->m_bUpdate = true;
}
// Awful! It seems that if the window size was not decreased
// the window region would never be updated until WM_PAINT was sent.
// So do not Update() until next WM_PAINT is received in this case
else if(LOWORD(lParam) > LOWORD(pThis->m_WndSize) || HIWORD(lParam) > HIWORD(pThis->m_WndSize))
pThis->m_bUpdate = true;
else
pThis->Update(hwnd);
}
}
pThis->m_WndSize = lParam;
}
break;
case WM_PAINT:
{
if(pThis->m_bUpdate)
{
pThis->Update(hwnd);
pThis->m_bUpdate = false;
}
//return hr;
break;
}
// In some cases of sizing, the up-right corner of the parent window region would not be properly updated
// Update() again when sizing is finished
case WM_EXITSIZEMOVE:
if(pThis->m_Status & SS_VISABLE)
{
pThis->Update(hwnd);
}
break;
case WM_SHOWWINDOW:
if(pThis->m_Status & SS_ENABLED && !(pThis->m_Status & SS_DISABLEDBYAERO))
{
LRESULT lResult = pDefProc(hwnd, uMsg, wParam, lParam);
if(!wParam) // the window is being hidden
{
ShowWindow(pThis->m_hWnd, SW_HIDE);
pThis->m_Status &= ~(SS_VISABLE | SS_PARENTVISIBLE);
}
else
{
// pThis->m_Status |= SS_VISABLE | SS_PARENTVISIBLE;
// ShowWindow(pThis->m_hWnd, SW_SHOWNA);
// pThis->Update(hwnd);
pThis->m_bUpdate = true;
pThis->Show(hwnd);
}
return lResult;
}
break;
case WM_DESTROY:
DestroyWindow(pThis->m_hWnd); // Destroy the shadow
break;
case WM_NCDESTROY:
s_Shadowmap.erase(hwnd); // Remove this window and shadow from the map
break;
case WM_DWMCOMPOSITIONCHANGED:
{
BOOL bAero = FALSE;
if(s_DwmIsCompositionEnabled) // "if" is actually not necessary here
s_DwmIsCompositionEnabled(&bAero);
if (bAero)
pThis->m_Status |= SS_DISABLEDBYAERO;
else
pThis->m_Status &= ~SS_DISABLEDBYAERO;
pThis->Show(hwnd);
}
break;
}
// Call the default(original) window procedure for other messages or messages processed but not returned
return pDefProc(hwnd, uMsg, wParam, lParam);
}
void CWndShadow::Update(HWND hParent)
{
//int ShadSize = 5;
//int Multi = 100 / ShadSize;
RECT WndRect;
GetWindowRect(hParent, &WndRect);
int nShadWndWid = WndRect.right - WndRect.left + m_nSize * 2;
int nShadWndHei = WndRect.bottom - WndRect.top + m_nSize * 2;
// Create the alpha blending bitmap
BITMAPINFO bmi; // bitmap header
ZeroMemory(&bmi, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = nShadWndWid;
bmi.bmiHeader.biHeight = nShadWndHei;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32; // four 8-bit components
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = nShadWndWid * nShadWndHei * 4;
BYTE *pvBits; // pointer to DIB section
HBITMAP hbitmap = CreateDIBSection(NULL, &bmi, DIB_RGB_COLORS, (void **)&pvBits, NULL, 0);
ZeroMemory(pvBits, bmi.bmiHeader.biSizeImage);
MakeShadow((UINT32 *)pvBits, hParent, &WndRect);
HDC hMemDC = CreateCompatibleDC(NULL);
HBITMAP hOriBmp = (HBITMAP)SelectObject(hMemDC, hbitmap);
POINT ptDst = {WndRect.left + m_nxOffset - m_nSize, WndRect.top + m_nyOffset - m_nSize};
POINT ptSrc = {0, 0};
SIZE WndSize = {nShadWndWid, nShadWndHei};
BLENDFUNCTION blendPixelFunction= { AC_SRC_OVER, 0, 255, AC_SRC_ALPHA };
MoveWindow(m_hWnd, ptDst.x, ptDst.y, nShadWndWid, nShadWndHei, FALSE);
BOOL bRet= s_UpdateLayeredWindow(m_hWnd, NULL, &ptDst, &WndSize, hMemDC,
&ptSrc, 0, &blendPixelFunction, ULW_ALPHA);
_ASSERT(bRet); // something was wrong....
// Delete used resources
SelectObject(hMemDC, hOriBmp);
DeleteObject(hbitmap);
DeleteDC(hMemDC);
}
void CWndShadow::MakeShadow(UINT32 *pShadBits, HWND hParent, RECT *rcParent)
{
// The shadow algorithm:
// Get the region of parent window,
// Apply morphologic erosion to shrink it into the size (ShadowWndSize - Sharpness)
// Apply modified (with blur effect) morphologic dilation to make the blurred border
// The algorithm is optimized by assuming parent window is just "one piece" and without "wholes" on it
// Get the region of parent window,
// Create a full rectangle region in case of the window region is not defined
HRGN hParentRgn = CreateRectRgn(0, 0, rcParent->right - rcParent->left, rcParent->bottom - rcParent->top);
GetWindowRgn(hParent, hParentRgn);
// Determine the Start and end point of each horizontal scan line
SIZE szParent = {rcParent->right - rcParent->left, rcParent->bottom - rcParent->top};
SIZE szShadow = {szParent.cx + 2 * m_nSize, szParent.cy + 2 * m_nSize};
// Extra 2 lines (set to be empty) in ptAnchors are used in dilation
int nAnchors = max(szParent.cy, szShadow.cy); // # of anchor points pares
int (*ptAnchors)[2] = new int[nAnchors + 2][2];
int (*ptAnchorsOri)[2] = new int[szParent.cy][2]; // anchor points, will not modify during erosion
ptAnchors[0][0] = szParent.cx;
ptAnchors[0][1] = 0;
ptAnchors[nAnchors + 1][0] = szParent.cx;
ptAnchors[nAnchors + 1][1] = 0;
if(m_nSize > 0)
{
// Put the parent window anchors at the center
for(int i = 0; i < m_nSize; i++)
{
ptAnchors[i + 1][0] = szParent.cx;
ptAnchors[i + 1][1] = 0;
ptAnchors[szShadow.cy - i][0] = szParent.cx;
ptAnchors[szShadow.cy - i][1] = 0;
}
ptAnchors += m_nSize;
}
for(int i = 0; i < szParent.cy; i++)
{
// find start point
int j;
for(j = 0; j < szParent.cx; j++)
{
if(PtInRegion(hParentRgn, j, i))
{
ptAnchors[i + 1][0] = j + m_nSize;
ptAnchorsOri[i][0] = j;
break;
}
}
if(j >= szParent.cx) // Start point not found
{
ptAnchors[i + 1][0] = szParent.cx;
ptAnchorsOri[i][1] = 0;
ptAnchors[i + 1][0] = szParent.cx;
ptAnchorsOri[i][1] = 0;
}
else
{
// find end point
for(j = szParent.cx - 1; j >= ptAnchors[i + 1][0]; j--)
{
if(PtInRegion(hParentRgn, j, i))
{
ptAnchors[i + 1][1] = j + 1 + m_nSize;
ptAnchorsOri[i][1] = j + 1;
break;
}
}
}
// if(0 != ptAnchorsOri[i][1])
// _RPTF2(_CRT_WARN, "%d %d
", ptAnchorsOri[i][0], ptAnchorsOri[i][1]);
}
if(m_nSize > 0)
ptAnchors -= m_nSize; // Restore pos of ptAnchors for erosion
int (*ptAnchorsTmp)[2] = new int[nAnchors + 2][2]; // Store the result of erosion
// First and last line should be empty
ptAnchorsTmp[0][0] = szParent.cx;
ptAnchorsTmp[0][1] = 0;
ptAnchorsTmp[nAnchors + 1][0] = szParent.cx;
ptAnchorsTmp[nAnchors + 1][1] = 0;
int nEroTimes = 0;
// morphologic erosion
for(int i = 0; i < m_nSharpness - m_nSize; i++)
{
nEroTimes++;
//ptAnchorsTmp[1][0] = szParent.cx;
//ptAnchorsTmp[1][1] = 0;
//ptAnchorsTmp[szParent.cy + 1][0] = szParent.cx;
//ptAnchorsTmp[szParent.cy + 1][1] = 0;
for(int j = 1; j < nAnchors + 1; j++)
{
ptAnchorsTmp[j][0] = max(ptAnchors[j - 1][0], max(ptAnchors[j][0], ptAnchors[j + 1][0])) + 1;
ptAnchorsTmp[j][1] = min(ptAnchors[j - 1][1], min(ptAnchors[j][1], ptAnchors[j + 1][1])) - 1;
}
// Exchange ptAnchors and ptAnchorsTmp;
int (*ptAnchorsXange)[2] = ptAnchorsTmp;
ptAnchorsTmp = ptAnchors;
ptAnchors = ptAnchorsXange;
}
// morphologic dilation
ptAnchors += (m_nSize < 0 ? -m_nSize : 0) + 1; // now coordinates in ptAnchors are same as in shadow window
// Generate the kernel
int nKernelSize = m_nSize > m_nSharpness ? m_nSize : m_nSharpness;
int nCenterSize = m_nSize > m_nSharpness ? (m_nSize - m_nSharpness) : 0;
UINT32 *pKernel = new UINT32[(2 * nKernelSize + 1) * (2 * nKernelSize + 1)];
UINT32 *pKernelIter = pKernel;
for(int i = 0; i <= 2 * nKernelSize; i++)
{
for(int j = 0; j <= 2 * nKernelSize; j++)
{
double dLength = sqrt((i - nKernelSize) * (i - nKernelSize) + (j - nKernelSize) * (double)(j - nKernelSize));
if(dLength < nCenterSize)
*pKernelIter = m_nDarkness << 24 | PreMultiply(m_Color, m_nDarkness);
else if(dLength <= nKernelSize)
{
UINT32 nFactor = ((UINT32)((1 - (dLength - nCenterSize) / (m_nSharpness + 1)) * m_nDarkness));
*pKernelIter = nFactor << 24 | PreMultiply(m_Color, nFactor);
}
else
*pKernelIter = 0;
//TRACE("%d ", *pKernelIter >> 24);
pKernelIter ++;
}
//TRACE("
");
}
// Generate blurred border
for(int i = nKernelSize; i < szShadow.cy - nKernelSize; i++)
{
int j;
if(ptAnchors[i][0] < ptAnchors[i][1])
{
// Start of line
for(j = ptAnchors[i][0];
j < min(max(ptAnchors[i - 1][0], ptAnchors[i + 1][0]) + 1, ptAnchors[i][1]);
j++)
{
for(int k = 0; k <= 2 * nKernelSize; k++)
{
UINT32 *pPixel = pShadBits +
(szShadow.cy - i - 1 + nKernelSize - k) * szShadow.cx + j - nKernelSize;
UINT32 *pKernelPixel = pKernel + k * (2 * nKernelSize + 1);
for(int l = 0; l <= 2 * nKernelSize; l++)
{
if(*pPixel < *pKernelPixel)
*pPixel = *pKernelPixel;
pPixel++;
pKernelPixel++;
}
}
} // for() start of line
// End of line
for(j = max(j, min(ptAnchors[i - 1][1], ptAnchors[i + 1][1]) - 1);
j < ptAnchors[i][1];
j++)
{
for(int k = 0; k <= 2 * nKernelSize; k++)
{
UINT32 *pPixel = pShadBits +
(szShadow.cy - i - 1 + nKernelSize - k) * szShadow.cx + j - nKernelSize;
UINT32 *pKernelPixel = pKernel + k * (2 * nKernelSize + 1);
for(int l = 0; l <= 2 * nKernelSize; l++)
{
if(*pPixel < *pKernelPixel)
*pPixel = *pKernelPixel;
pPixel++;
pKernelPixel++;
}
}
} // for() end of line
}
} // for() Generate blurred border
// Erase unwanted parts and complement missing
UINT32 clCenter = m_nDarkness << 24 | PreMultiply(m_Color, m_nDarkness);
for(int i = min(nKernelSize, max(m_nSize - m_nyOffset, 0));
i < max(szShadow.cy - nKernelSize, min(szParent.cy + m_nSize - m_nyOffset, szParent.cy + 2 * m_nSize));
i++)
{
UINT32 *pLine = pShadBits + (szShadow.cy - i - 1) * szShadow.cx;
if(i - m_nSize + m_nyOffset < 0 || i - m_nSize + m_nyOffset >= szParent.cy) // Line is not covered by parent window
{
for(int j = ptAnchors[i][0]; j < ptAnchors[i][1]; j++)
{
*(pLine + j) = clCenter;
}
}
else
{
for(int j = ptAnchors[i][0];
j < min(ptAnchorsOri[i - m_nSize + m_nyOffset][0] + m_nSize - m_nxOffset, ptAnchors[i][1]);
j++)
*(pLine + j) = clCenter;
for(int j = max(ptAnchorsOri[i - m_nSize + m_nyOffset][0] + m_nSize - m_nxOffset, 0);
j < min(ptAnchorsOri[i - m_nSize + m_nyOffset][1] + m_nSize - m_nxOffset, szShadow.cx);
j++)
*(pLine + j) = 0;
for(int j = max(ptAnchorsOri[i - m_nSize + m_nyOffset][1] + m_nSize - m_nxOffset, ptAnchors[i][0]);
j < ptAnchors[i][1];
j++)
*(pLine + j) = clCenter;
}
}
// Delete used resources
delete[] (ptAnchors - (m_nSize < 0 ? -m_nSize : 0) - 1);
delete[] ptAnchorsTmp;
delete[] ptAnchorsOri;
delete[] pKernel;
DeleteObject(hParentRgn);
}
bool CWndShadow::SetSize(int NewSize)
{
if(NewSize > 20 || NewSize < -20)
return false;
m_nSize = (signed char)NewSize;
if(SS_VISABLE & m_Status)
Update(GetParent(m_hWnd));
return true;
}
bool CWndShadow::SetSharpness(unsigned int NewSharpness)
{
if(NewSharpness > 20)
return false;
m_nSharpness = (unsigned char)NewSharpness;
if(SS_VISABLE & m_Status)
Update(GetParent(m_hWnd));
return true;
}
bool CWndShadow::SetDarkness(unsigned int NewDarkness)
{
if(NewDarkness > 255)
return false;
m_nDarkness = (unsigned char)NewDarkness;
if(SS_VISABLE & m_Status)
Update(GetParent(m_hWnd));
return true;
}
bool CWndShadow::SetPosition(int NewXOffset, int NewYOffset)
{
if(NewXOffset > 20 || NewXOffset < -20 ||
NewYOffset > 20 || NewYOffset < -20)
return false;
m_nxOffset = (signed char)NewXOffset;
m_nyOffset = (signed char)NewYOffset;
if(SS_VISABLE & m_Status)
Update(GetParent(m_hWnd));
return true;
}
bool CWndShadow::SetColor(COLORREF NewColor)
{
m_Color = NewColor;
if(SS_VISABLE & m_Status)
Update(GetParent(m_hWnd));
return true;
}
void CWndShadow::Show(HWND hParentWnd)
{
// Clear all except the enabled status
m_Status &= SS_ENABLED | SS_DISABLEDBYAERO;
if((m_Status & SS_ENABLED) && !(m_Status & SS_DISABLEDBYAERO)) // Enabled
{
// Determine the show state of shadow according to parent window's state
LONG lParentStyle = GetWindowLong(hParentWnd, GWL_STYLE);
if(WS_VISIBLE & lParentStyle) // Parent visible
{
m_Status |= SS_PARENTVISIBLE;
// Parent is normal, show the shadow
if(!((WS_MAXIMIZE | WS_MINIMIZE) & lParentStyle)) // Parent visible but does not need shadow
m_Status |= SS_VISABLE;
}
}
if(m_Status & SS_VISABLE)
{
ShowWindow(m_hWnd, SW_SHOWNA);
Update(hParentWnd);
}
else
ShowWindow(m_hWnd, SW_HIDE);
}
bool CWndShadow::DestroyShadow()
{
PostQuitMessage (0) ;
return true;
}