///////////////////////////////////////////////////////////////////////////////
// class CRgnX
//
// Author: Yury Goltsman
// email: ygprg@go.to
// page: http://go.to/ygprg
// Copyright � 2000, Yury Goltsman
//
// This code provided "AS IS," without warranty of any kind.
// You may freely use or modify this code provided this
// Copyright is included in all derived versions.
//
// version : 1.0
// This code based on function created by Jean-Edouard Lachand-Robert
//
#include "stdafx.h"
#include "RgnX.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
static HRGN BitmapToRegion(HBITMAP hBmp, COLORREF cTransparentColor, COLORREF cTolerance);
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CRgnX::CRgnX()
{
}
CRgnX::~CRgnX()
{
}
BOOL CRgnX::FromBitmap(HBITMAP hBmp, COLORREF clrTransparent, COLORREF clrTolerance)
{
HRGN hRgn = BitmapToRegion(hBmp, clrTransparent, clrTolerance);
if(!hRgn)
return FALSE;
if(GetSafeHandle())
DeleteObject();
return Attach(hRgn);
}
BOOL CRgnX::FromBitmapResource(UINT nBitmapID, COLORREF clrTransparent, COLORREF clrTolerance)
{
CBitmap bmp;
bmp.LoadBitmap(nBitmapID);
return FromBitmap((HBITMAP)bmp.GetSafeHandle(), clrTransparent,clrTolerance);
}
BOOL CRgnX::FromBitmapResource(LPCTSTR lpszBitmapID, COLORREF clrTransparent, COLORREF clrTolerance)
{
CBitmap bmp;
bmp.LoadBitmap(lpszBitmapID);
return FromBitmap((HBITMAP)bmp.GetSafeHandle(), clrTransparent,clrTolerance);
}
BOOL CRgnX::FromText(UINT nStringID, LPRECT pRC, DWORD dwStyle, CFont* pFont, LPDRAWTEXTPARAMS lpDTParams)
{
CString s;
s.LoadString(nStringID);
return CRgnX::FromText(s, pRC, dwStyle, pFont, lpDTParams);
}
BOOL CRgnX::FromText(LPCTSTR lpszText, LPRECT pRC, DWORD dwStyle, CFont* pFont, LPDRAWTEXTPARAMS lpDTParams)
{
if(!pRC)
{
ASSERT(0); // must be specified
return FALSE;
}
CDC dc;
dc.CreateCompatibleDC(NULL);
CFont* pOldFont = NULL;
if(pFont)
pOldFont = dc.SelectObject(pFont);
if(dwStyle & DT_CALCRECT)
{
// recalc rect if DT_CALCRECT specified
DrawTextEx(dc.GetSafeHdc(), (LPTSTR)lpszText, -1, pRC, dwStyle, lpDTParams);
dwStyle &= ~DT_CALCRECT;
}
HBITMAP hBmp = ::CreateBitmap(pRC->right - pRC->left, pRC->bottom - pRC->top, 1, 1, NULL);
HBITMAP hOldBmp = (HBITMAP)::SelectObject(dc.GetSafeHdc(), hBmp);
if(!hOldBmp)
{
ASSERT(0);
return FALSE;
}
dc.SetTextColor(0); // black
dc.SetBkColor(0xffffff); // white
// fill bitmap
dc.FillSolidRect(pRC, 0xffffff); // white
::DrawTextEx(dc.GetSafeHdc(), (LPTSTR)lpszText, -1, pRC, dwStyle, lpDTParams);
if(pOldFont)
dc.SelectObject(pOldFont);
::SelectObject(dc.GetSafeHdc(), hOldBmp);
// create rgn
BOOL fOk = FromBitmap(hBmp, 0xffffff);
::DeleteObject(hBmp);
return fOk;
}
/////////////////////////////////////////////////////////////////////
// Converts a bitmap to a region
//
// BitmapToRegion : Create a region from the "non-transparent" pixels of a bitmap
// Author : Jean-Edouard Lachand-Robert (http://www.geocities.com/Paris/LeftBank/1160/resume.htm), June 1998.
//
// hBmp : Source bitmap
// cTransparentColor : Color base for the "transparent" pixels (default is black)
// cTolerance : Color tolerance for the "transparent" pixels.
//
// A pixel is assumed to be transparent if the value of each of its 3 components (blue, green and red) is
// greater or equal to the corresponding value in cTransparentColor and is lower or equal to the
// corresponding value in cTransparentColor + cTolerance.
//
HRGN BitmapToRegion(HBITMAP hBmp, COLORREF cTransparentColor, COLORREF cTolerance)
{
HRGN hRgn = NULL;
if(hBmp)
{
// Create a memory DC inside which we will scan the bitmap content
HDC hMemDC = CreateCompatibleDC(NULL);
if(hMemDC)
{
// Get bitmap size
BITMAP bm;
GetObject(hBmp, sizeof(bm), &bm);
// Create a 32 bits depth bitmap and select it into the memory DC
BITMAPINFOHEADER RGB32BITSBITMAPINFO = {
sizeof(BITMAPINFOHEADER), // biSize
bm.bmWidth, // biWidth;
bm.bmHeight, // biHeight;
1, // biPlanes;
32, // biBitCount
BI_RGB, // biCompression;
0, // biSizeImage;
0, // biXPelsPerMeter;
0, // biYPelsPerMeter;
0, // biClrUsed;
0 // biClrImportant;
};
VOID * pbits32;
HBITMAP hbm32 = CreateDIBSection(hMemDC, (BITMAPINFO *)&RGB32BITSBITMAPINFO, DIB_RGB_COLORS, &pbits32, NULL, 0);
if(hbm32)
{
HBITMAP holdBmp = (HBITMAP)SelectObject(hMemDC, hbm32);
// Create a DC just to copy the bitmap into the memory DC
HDC hDC = CreateCompatibleDC(hMemDC);
if(hDC)
{
// Get how many bytes per row we have for the bitmap bits (rounded up to 32 bits)
BITMAP bm32;
GetObject(hbm32, sizeof(bm32), &bm32);
while(bm32.bmWidthBytes % 4)
bm32.bmWidthBytes++;
// Copy the bitmap into the memory DC
HBITMAP holdBmp = (HBITMAP)SelectObject(hDC, hBmp);
BitBlt(hMemDC, 0, 0, bm.bmWidth, bm.bmHeight, hDC, 0, 0, SRCCOPY);
// For better performances, we will use the ExtCreateRegion() function to create the
// region. This function take a RGNDATA structure on entry. We will add rectangles by
// amount of ALLOC_UNIT number in this structure.
#define ALLOC_UNIT 100
DWORD maxRects = ALLOC_UNIT;
HANDLE hData = GlobalAlloc(GMEM_MOVEABLE, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects));
RGNDATA *pData = (RGNDATA *)GlobalLock(hData);
pData->rdh.dwSize = sizeof(RGNDATAHEADER);
pData->rdh.iType = RDH_RECTANGLES;
pData->rdh.nCount = pData->rdh.nRgnSize = 0;
SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
// Keep on hand highest and lowest values for the "transparent" pixels
BYTE lr = GetRValue(cTransparentColor);
BYTE lg = GetGValue(cTransparentColor);
BYTE lb = GetBValue(cTransparentColor);
BYTE hr = min(0xff, lr + GetRValue(cTolerance));
BYTE hg = min(0xff, lg + GetGValue(cTolerance));
BYTE hb = min(0xff, lb + GetBValue(cTolerance));
// Scan each bitmap row from bottom to top (the bitmap is inverted vertically)
BYTE *p32 = (BYTE *)bm32.bmBits + (bm32.bmHeight - 1) * bm32.bmWidthBytes;
for(int y = 0; y < bm.bmHeight; y++)
{
// Scan each bitmap pixel from left to right
for(int x = 0; x < bm.bmWidth; x++)
{
// Search for a continuous range of "non transparent pixels"
int x0 = x;
LONG *p = (LONG *)p32 + x;
while(x < bm.bmWidth)
{
BYTE b = GetRValue(*p);
if(b >= lr && b <= hr)
{
b = GetGValue(*p);
if(b >= lg && b <= hg)
{
b = GetBValue(*p);
if(b >= lb && b <= hb)
// This pixel is "transparent"
break;
}
}
p++;
x++;
}
if(x > x0)
{
// Add the pixels (x0, y) to (x, y+1) as a new rectangle in the region
if(pData->rdh.nCount >= maxRects)
{
GlobalUnlock(hData);
maxRects += ALLOC_UNIT;
hData = GlobalReAlloc(hData, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), GMEM_MOVEABLE);
pData = (RGNDATA *)GlobalLock(hData);
}
RECT *pr = (RECT *)&pData->Buffer;
SetRect(&pr[pData->rdh.nCount], x0, y, x, y+1);
if(x0 < pData->rdh.rcBound.left)
pData->rdh.rcBound.left = x0;
if(y < pData->rdh.rcBound.top)
pData->rdh.rcBound.top = y;
if(x > pData->rdh.rcBound.right)
pData->rdh.rcBound.right = x;
if(y+1 > pData->rdh.rcBound.bottom)
pData->rdh.rcBound.bottom = y+1;
pData->rdh.nCount++;
// On Windows98, ExtCreateRegion() may fail if the number of rectangles is too
// large (ie: > 4000). Therefore, we have to create the region by multiple steps.
if(pData->rdh.nCount == 2000)
{
HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
if(hRgn)
{
CombineRgn(hRgn, hRgn, h, RGN_OR);
DeleteObject(h);
}
else
hRgn = h;
pData->rdh.nCount = 0;
SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
}
}
}
// Go to next row (remember, the bitmap is inverted vertically)
p32 -= bm32.bmWidthBytes;
}
// Create or extend the region with the remaining rectangles
HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
if(hRgn)
{
CombineRgn(hRgn, hRgn, h, RGN_OR);
DeleteObject(h);
}
else
hRgn = h;
// Clean up
GlobalFree(hData);
SelectObject(hDC, holdBmp);
DeleteDC(hDC);
}
DeleteObject(SelectObject(hMemDC, holdBmp));
}
DeleteDC(hMemDC);
}
}
return hRgn;
}