Dib.cpp
上传用户:zhoushen
上传日期:2022-06-15
资源大小:84k
文件大小:4k
- //////////////////////////////////
- // Device independent bitmap manager
- //
- #include "StdAfx.h"
- #include "Dib.h"
-
- #ifdef _MSC_VER
- #pragma comment( lib, "vfw32.lib")
- #endif
- IMPLEMENT_DYNAMIC(CDib, CBitmap)
- CDib::CDib()
- {
- m_pbmih = NULL;
- m_hdd = NULL;
- }
- CDib::~CDib()
- {
- DeleteObject();
- }
- void CDib::DeleteObject()
- {
- if (m_hdd)
- {
- DrawDibClose(m_hdd);
- m_hdd = NULL;
- }
- if (m_pbmih)
- {
- delete [] (char*)m_pbmih;
- m_pbmih = NULL;
- }
- }
- UINT CDib::GetNumPaletteColors()
- {
- // Calculate # entries in color table:
- // if biClrUsed is not specified, then use:
- // (2,16,256) for (1,4,8)-bit bitmaps;
- // 0 for 24, 32-bit bitmaps (no color table)
- UINT nColors=m_pbmih->biClrUsed;
- if (nColors==0 && m_pbmih->biBitCount<=8)
- nColors = 1<<m_pbmih->biBitCount;
- return nColors;
- }
- LPBYTE CDib::GetBits()
- {
- return (LPBYTE)m_pbmih + m_pbmih->biSize + GetNumPaletteColors()*sizeof(RGBQUAD);
- }
- const BITMAP_TYPE = (WORD)('M' << 8) | 'B';
- BOOL CDib::Load(LPCTSTR szPathName)
- {
- if( m_hObject )
- Detach();
-
- if( Attach(::LoadImage(NULL, szPathName,IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION | LR_DEFAULTSIZE)) )
- {
- CFile file;
- BOOL bRet = FALSE;
- file.Open( szPathName, CFile::modeRead );
- if( Load( file )==TRUE )
- bRet = CreatePalette();
- file.Close();
- return bRet;
- }
- return FALSE;
- }
- /*BOOL CDib::Load(UINT imageID)
- {
- if( m_hObject )
- Detach();
-
- MAKEINTRESOURCE
- if( Attach(::LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(imageID), IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_DEFAULTSIZE)) )
- {
- CFile file;
- BOOL bRet = FALSE;
- file.Open( szPathName, CFile::modeRead );
- if( Load( file )==TRUE )
- bRet = CreatePalette();
- file.Close();
- return bRet;
- }
- return FALSE;
- }*/
- BOOL CDib::Load(CFile &file)
- {
- BITMAPFILEHEADER hdr;
- DWORD len = file.Read(&hdr, sizeof(hdr));
- if ((len!=sizeof(hdr)) || (hdr.bfType!=BITMAP_TYPE))
- {
- TRACE0("***CDib: bad BITMAPFILEHEADERn");
- return FALSE;
- }
- len = file.GetLength() - len;
- m_pbmih = (BITMAPINFOHEADER*)new char[len];
- file.Read(m_pbmih, len);
- return TRUE;
- }
- BOOL CDib::Draw(CDC& dc, const CRect* rcDst, const CRect* rcSrc)
- {
- if (!m_pbmih)
- return FALSE;
- if (!m_hdd)
- VERIFY(m_hdd = DrawDibOpen());
- CRect rc;
- if (!rcSrc)
- {
- // if no source rect, use whole bitmap
- rc.SetRect(0, 0, m_pbmih->biWidth, m_pbmih->biHeight);
- rcSrc=&rc;
- }
- if (!rcDst)
- {
- // if no destination rect, use source
- rcDst=rcSrc;
- }
- // This is as easy as it gets in Windows.
- return DrawDibDraw(m_hdd, dc, rcDst->left, rcDst->top, rcDst->Width(), rcDst->Height(), m_pbmih, GetBits(), rcSrc->left, rcSrc->top, rcSrc->Width(), rcSrc->Height(), 0);
- }
- BOOL CDib::Draw(CDC *pDC)
- {
- if( m_hObject )
- {
- CPalette* pOldPal = pDC->SelectPalette(CPalette::FromHandle(m_pal),FALSE);
- pDC->RealizePalette();
- BOOL bRet = DrawBitmap(*pDC, this); // as before
- pDC->SelectPalette(pOldPal, TRUE);
- return bRet;
- }
- return FALSE;
- }
- BOOL CDib::CreatePalette()
- {
- int i = 0;
- int nColors = GetNumPaletteColors();
- CDC *pDC = CDC::FromHandle( GetDC(AfxGetApp()->m_pMainWnd->GetSafeHwnd()) );
- CDC mdc; // memory DC
- RGBQUAD *pRgbQuad = NULL;
- LPLOGPALETTE lpPal;
- HANDLE hLogPal;
- CBitmap* pOld = NULL;
- pRgbQuad = new RGBQUAD[nColors];
- mdc.CreateCompatibleDC(pDC);
- pOld = mdc.SelectObject(this);
- GetDIBColorTable( mdc.GetSafeHdc(), 0, nColors, pRgbQuad );
- if( nColors )
- {
- hLogPal = GlobalAlloc (GHND, sizeof (LOGPALETTE) +
- sizeof (PALETTEENTRY) * nColors);
- lpPal = (LPLOGPALETTE) GlobalLock (hLogPal);
- lpPal->palVersion = 0x300;
- lpPal->palNumEntries = nColors;
- for (i = 0; i < nColors; i++)
- {
- lpPal->palPalEntry[i].peRed = pRgbQuad[i].rgbRed;
- lpPal->palPalEntry[i].peGreen = pRgbQuad[i].rgbGreen;
- lpPal->palPalEntry[i].peBlue = pRgbQuad[i].rgbBlue;
- lpPal->palPalEntry[i].peFlags = 0;
- }
- m_pal = ::CreatePalette( lpPal );
- GlobalUnlock(hLogPal);
- GlobalFree(hLogPal);
- }
- delete []pRgbQuad;
- ReleaseDC( AfxGetApp()->m_pMainWnd->GetSafeHwnd(), pDC->GetSafeHdc() );
- return TRUE;
- }
- BOOL DrawBitmap(CDC& dc, CBitmap* pbm)
- {
- CDC mdc; // memory DC
- BITMAP bm;
- mdc.CreateCompatibleDC(&dc);
- CBitmap* pOld = mdc.SelectObject(pbm);
- pbm->GetObject(sizeof(bm), &bm);
- BOOL bRet = dc.BitBlt( 0, 0, bm.bmWidth, bm.bmHeight, &mdc, 0, 0, SRCCOPY);
- mdc.SelectObject(pOld);
- return bRet;
- }