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TIMSDK/Windows/Demo/IMApp/WndShadow.cpp
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lynxzhang 7adc9797de IM SDK 增强版发布5.6.1200版本
2021-08-31 20:42:47 +08:00

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// WndShadow.h : header file
//
// Version 0.1
//
// Copyright (c) 2006 Perry 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 Perry 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.
//
/////////////////////////////////////////////////////////////////////////////
//****************************************************************************
#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
CWndShadow::pfnUpdateLayeredWindow CWndShadow::s_UpdateLayeredWindow = NULL;
const TCHAR *strWndClassName = _T("PerryShadowWnd");
HINSTANCE CWndShadow::s_hInstance = (HINSTANCE)INVALID_HANDLE_VALUE;
std::map<HWND, CWndShadow *> CWndShadow::s_Shadowmap;
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 hUser32 = GetModuleHandle(_T("USER32.DLL"));
s_UpdateLayeredWindow =
(pfnUpdateLayeredWindow)GetProcAddress(hUser32,
"UpdateLayeredWindow");
// If the import did not succeed, make sure your app can handle it!
if (NULL == s_UpdateLayeredWindow)
return false;
// 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,bool IsWS_CAPTION /*= false*/)
{
// 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
LONG styleValue = IsWS_CAPTION ? WS_CAPTION : 0;
m_hWnd = CreateWindowEx(WS_EX_LAYERED | WS_EX_TRANSPARENT, strWndClassName, NULL,
/*WS_VISIBLE | */styleValue | WS_POPUPWINDOW,
CW_USEDEFAULT, 0, 0, 0, hParentWnd, NULL, s_hInstance, NULL);
// Determine the initial show state of shadow according to parent window's state
LONG lParentStyle = GetWindowLong(hParentWnd, GWL_STYLE);
if(!(WS_VISIBLE & lParentStyle)) // Parent invisible
m_Status = SS_ENABLED;
else if((WS_MAXIMIZE | WS_MINIMIZE) & lParentStyle) // Parent visible but does not need shadow
m_Status = SS_ENABLED | SS_PARENTVISIBLE;
else // Show the shadow
{
m_Status = SS_ENABLED | SS_VISABLE | SS_PARENTVISIBLE;
::ShowWindow(m_hWnd, SW_SHOWNA);
Update(hParentWnd);
}
// 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];
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)
{
if(SIZE_MAXIMIZED == wParam || SIZE_MINIMIZED == wParam)
{
::ShowWindow(pThis->m_hWnd, SW_HIDE);
pThis->m_Status &= ~SS_VISABLE;
}
else if(pThis->m_Status & SS_PARENTVISIBLE) // Parent maybe resized even if invisible
{
// 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
if(LOWORD(lParam) > LOWORD(pThis->m_WndSize) || HIWORD(lParam) > HIWORD(pThis->m_WndSize))
pThis->m_bUpdate = true;
else
pThis->Update(hwnd);
if(!(pThis->m_Status & SS_VISABLE))
{
::ShowWindow(pThis->m_hWnd, SW_SHOWNA);
pThis->m_Status |= SS_VISABLE;
}
}
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)
{
if(!wParam) // the window is being hidden
{
::ShowWindow(pThis->m_hWnd, SW_HIDE);
pThis->m_Status &= ~(SS_VISABLE | SS_PARENTVISIBLE);
}
else if(!(pThis->m_Status & SS_PARENTVISIBLE))
{
//pThis->Update(hwnd);
pThis->m_bUpdate = true;
::ShowWindow(pThis->m_hWnd, SW_SHOWNA);
pThis->m_Status |= SS_VISABLE | SS_PARENTVISIBLE;
}
}
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;
}
#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
return ((WNDPROC)pThis->m_OriParentProc)(hwnd, uMsg, wParam, lParam);
#pragma warning(default: 4312)
}
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,
HRGN hParentRgn = CreateRectRgn(0, 0, 0, 0);
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(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("\n");
}
// 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;
}
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