cdib.rar_CDib_CDib 代码下载_CDib类_cdib pudn_cimage

// cdib.cpp // new version for WIN32 #include "stdafx.h" #include "cdib.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif IMPLEMENT_SERIAL(CDib, CObject, 0); /*------------------------------------------------------------------------- CDib() 为了从文件中装入CDib，或者与一个内存中的DIB相联系，可以先使用缺省的构造函数， 该函数创建一个空的DIB对象。 --------------------------------------------------------------------------*/ CDib::CDib() { m_hFile = NULL; m_hBitmap = NULL; m_hPalette = NULL; m_nBmihAlloc = m_nImageAlloc = noAlloc; Empty(); } /*------------------------------------------------------------------------------------ CDib(CSize size, int nBitCount) 函数功能:如果需要通过CreatDIBSection函数创建DIB项，就要用这个构造函数，该函数的参数包括DIB 的尺寸，颜色数，该构造函数分配信息头，但是部分给图像内存，如果我们需要自己分贝的 图像内存的话，也就可以使用给构造函数。 参数：size CSize对象，包含DIB的宽度和高度 nBitCount 每个象素的位数，必须为1、4、8、16、24、32 ---------------------------------------------------------------------------------------*/ CDib::CDib(CSize size, int nBitCount) { m_hFile = NULL; m_hBitmap = NULL; m_hPalette = NULL; m_nBmihAlloc = m_nImageAlloc = noAlloc; Empty(); ComputePaletteSize(nBitCount); m_lpBMIH = (LPBITMAPINFOHEADER) new char[sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries]; m_nBmihAlloc = crtAlloc; m_lpBMIH->biSize = sizeof(BITMAPINFOHEADER); m_lpBMIH->biWidth = size.cx; m_lpBMIH->biHeight = size.cy; m_lpBMIH->biPlanes = 1; m_lpBMIH->biBitCount = nBitCount; m_lpBMIH->biCompression = BI_RGB; m_lpBMIH->biSizeImage = 0; m_lpBMIH->biXPelsPerMeter = 0; m_lpBMIH->biYPelsPerMeter = 0; m_lpBMIH->biClrUsed = m_nColorTableEntries; m_lpBMIH->biClrImportant = m_nColorTableEntries; ComputeMetrics(); memset(m_lpvColorTable, 0, sizeof(RGBQUAD) * m_nColorTableEntries); m_lpImage = NULL; // no data yet } /*CDib的析购函数被用来释放所申请的DIB内存*/ CDib::~CDib() { Empty(); } CSize CDib::GetDimensions() { if(m_lpBMIH == NULL) return CSize(0, 0); return CSize((int) m_lpBMIH->biWidth, (int) m_lpBMIH->biHeight); } /*------------------------------------------------------------------------------------- AttachMapFile(const char* strPathname, BOOL bShare) 函数功能：该函数用读模式打开一个内存影射文件，并与CDib对象联系起来。该函数会立即返回， 因为文件知道被读进内存。不过，当我们访问DIB时，在文件装入内存页时，可能会有 一点延迟，AttachMapFile函数释放原来已经分配的内存，并关闭沿线已经与他有联系 的内存影射文件。 参数: strPathname 被影射的文件路径名 bShare 如果文件以共享方式被打开则为TRUE，缺省值为FALSE 返回值 如果成功则返回TRUE --------------------------------------------------------------------------------------*/ BOOL CDib::AttachMapFile(const char* strPathname, BOOL bShare) // for reading { // if we open the same file twice, Windows treats it as 2 separate files // doesn't work with rare BMP files where # palette entries > biClrUsed HANDLE hFile = ::CreateFile(strPathname, GENERIC_WRITE | GENERIC_READ, bShare ? FILE_SHARE_READ : 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); ASSERT(hFile != INVALID_HANDLE_VALUE); DWORD dwFileSize = ::GetFileSize(hFile, NULL); HANDLE hMap = ::CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL); DWORD dwErr = ::GetLastError(); if(hMap == NULL) { AfxMessageBox("Empty bitmap file"); return FALSE; } LPVOID lpvFile = ::MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0); // map whole file ASSERT(lpvFile != NULL); if(((LPBITMAPFILEHEADER) lpvFile)->bfType != 0x4d42) { AfxMessageBox("Invalid bitmap file"); DetachMapFile(); return FALSE; } AttachMemory((LPBYTE) lpvFile + sizeof(BITMAPFILEHEADER)); m_lpvFile = lpvFile; m_hFile = hFile; m_hMap = hMap; return TRUE; } /*---------------------------------------------------------------------------------------- CopyToMapFile(const char* strPathname) 函数功能: 该函数创建一个新的内存影射文件，并把CDib数据拷贝到该文件的内存中，同时释放任何前面 已经分配的内存并关闭任何已经有的内存影射文件。虽然要孩子接到新的文件被关闭时数据才会 真正被写到磁盘上，但当CDib对象被重新使用或者被删除时数据也会被写到磁盘上。 参数： strPathname 被影射的文件路径名 返回值 如果成功则为TRUE -----------------------------------------------------------------------------------------*/ BOOL CDib::CopyToMapFile(const char* strPathname) { // copies DIB to a new file, releases prior pointers // if you previously used CreateSection, the HBITMAP will be NULL (and unusable) BITMAPFILEHEADER bmfh; bmfh.bfType = 0x4d42; // 'BM' bmfh.bfSize = m_dwSizeImage + sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries + sizeof(BITMAPFILEHEADER); // meaning of bfSize open to interpretation bmfh.bfReserved1 = bmfh.bfReserved2 = 0; bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries; HANDLE hFile = ::CreateFile(strPathname, GENERIC_WRITE | GENERIC_READ, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); ASSERT(hFile != INVALID_HANDLE_VALUE); int nSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries + m_dwSizeImage; HANDLE hMap = ::CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, nSize, NULL); DWORD dwErr = ::GetLastError(); ASSERT(hMap != NULL); LPVOID lpvFile = ::MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0); // map whole file ASSERT(lpvFile != NULL); LPBYTE lpbCurrent = (LPBYTE) lpvFile; memcpy(lpbCurrent, &bmfh, sizeof(BITMAPFILEHEADER)); // file header lpbCurrent += sizeof(BITMAPFILEHEADER); LPBITMAPINFOHEADER lpBMIH = (LPBITMAPINFOHEADER) lpbCurrent; memcpy(lpbCurrent, m_lpBMIH, sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries); // info lpbCurrent += sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries; memcpy(lpbCurrent, m_lpImage, m_dwSizeImage); // bit image DWORD dwSizeImage = m_dwSizeImage; Empty(); m_dwSizeImage = dwSizeImage; m_nBmihAlloc = m_nImageAlloc = noAlloc; m_lpBMIH = lpBMIH; m_lpImage = lpbCurrent; m_hFile = hFile; m_hMap = hMap; m_lpvFile = lpvFile; ComputePaletteSize(m_lpBMIH->biBitCount); ComputeMetrics(); MakePalette(); return TRUE; } /*--------------------------------------------------------------------------------- AttachMemory(LPVOID lpvMem, BOOL bMustDelete, HGLOBAL hGlobal) 函数功能：该函数时已经存在的CDib对象和内存中的一个DIB联系起来。该内存可能是程序的资源， 或者可以使剪贴板甚至是OLE数据对象内存。该内存可以是new在CRT堆中分配的，也可 以是用GlobalAlloc在Windows堆中分配的。 参数： lpvMem 要联系的内存地址 bNustDelte 标记，如果由CDib类负责释放内存则TRUE，缺省值FALSE hGlobal 如果内存是通过调用GlobalAlloc得到的，那么CDib对象就必须保存该句柄， 这样以后可释放该句柄，这里假定bMustDelete被设置到TRUE 返回值 如果成功则为TRUE ---------------------------------------------------------------------------------*/ BOOL CDib::AttachMemory(LPVOID lpvMem, BOOL bMustDelete, HGLOBAL hGlobal) { // assumes contiguous BITMAPINFOHEADER, color table, image // color table could be zero length Empty(); m_hGlobal = hGlobal; if(bMustDelete == FALSE) { m_nBmihAlloc = noAlloc; } else { m_nBmihAlloc = ((hGlobal == NULL) ? crtAlloc : heapAlloc); } try { m_lpBMIH = (LPBITMAPINFOHEADER) lpvMem; ComputeMetrics(); ComputePaletteSize(m_lpBMIH->biBitCount); m_lpImage = (LPBYTE) m_lpvColorTable + sizeof(RGBQUAD) * m_nColorTableEntries; MakePalette(); } catch(CException* pe) { AfxMessageBox("AttachMemory error"); pe->Delete(); return FALSE; } return TRUE; } /*--------------------------------------------------------------------------------- UsePalette(CDC* pDC, BOOL bBackground