BMP图像文件读写操作类，C++实现，支持24位位图

//--------------------------------------------------------------------------- #pragma hdrstop #include "BMPHelper.h" //--------------------------------------------------------------------------- #pragma package(smart_init) //--------------------------------------------------------------------------- TBMPHelper::TBMPHelper(void) { InitBMPFile(); } //--------------------------------------------------------------------------- TBMPHelper::~TBMPHelper(void) { if(NULL != m_BMPFile->BMPData) { delete []m_BMPFile->BMPData; m_BMPFile->BMPData = NULL; } delete m_BMPFile; } //--------------------------------------------------------------------------- void TBMPHelper::InitBMPFile(void) { m_BMPFile = new BITMAPFILE; memset(&(m_BMPFile->FileHeader), 0, sizeof(m_BMPFile->FileHeader)); memset(&(m_BMPFile->InfoHeader), 0, sizeof(m_BMPFile->InfoHeader)); m_BMPFile->BMPData = NULL; m_RealImageWidth = 0; m_RealImageHeight = 0; m_RealImageDataSize = 0; } //--------------------------------------------------------------------------- int TBMPHelper::OpenBMPFile(const wchar_t* wszFileName) { wchar_t wszOpenMode[] = {'r','b'}; FILE *pFile = _wfopen(wszFileName, wszOpenMode); if(NULL == pFile) { return 1; } // 加载位图文件头 fseek(pFile, 0, SEEK_SET); fread(&(m_BMPFile->FileHeader), sizeof(m_BMPFile->FileHeader), 1, pFile); // 不是有效的BMP位图文件 if(0x4d42 != m_BMPFile->FileHeader.bfType) { fclose(pFile); return 2; } // 加载位图信息头 fseek(pFile, sizeof(m_BMPFile->FileHeader), SEEK_SET); fread(&(m_BMPFile->InfoHeader), sizeof(m_BMPFile->InfoHeader), 1, pFile); // 仅支持24位真彩色图像 if(24 != m_BMPFile->InfoHeader.biBitCount) { fclose(pFile); return 3; } // 计算位图数据大小，这里计算数据需要检测高度值的正负性 m_RealImageWidth = m_BMPFile->InfoHeader.biWidth; m_RealImageHeight = m_BMPFile->InfoHeader.biHeight > 0 ? m_BMPFile->InfoHeader.biHeight : -(m_BMPFile->InfoHeader.biHeight); WORD BitsPerPixel = m_BMPFile->InfoHeader.biBitCount; DWORD LineByteCnt = (m_RealImageWidth*BitsPerPixel)/8; m_RealImageDataSize = LineByteCnt*m_RealImageHeight; m_BMPFile->BMPData = new BYTE[m_RealImageDataSize]; fseek(pFile, m_BMPFile->FileHeader.bfOffBits, SEEK_SET); // 不需要四字节对齐处理 if(0 == LineByteCnt%4) { // 加载位图数据 fread(m_BMPFile->BMPData, m_RealImageDataSize, 1, pFile); } else { BYTE *WTDataBuf = m_BMPFile->BMPData; LONG WTSize = 3*m_RealImageWidth; int FillOffset = 4 - LineByteCnt%4; for(int iY=0; iY<m_RealImageHeight; iY++) { // 加载位图数据 fread(WTDataBuf, WTSize, 1, pFile); WTDataBuf += WTSize; fseek(pFile, FillOffset, SEEK_CUR); } } fclose(pFile); return 0; } //--------------------------------------------------------------------------- int TBMPHelper::SaveToBMPFile(const wchar_t* wszFileName) { if(NULL == m_BMPFile->BMPData) { return 1; } wchar_t wszOpenMode[] = {'w','b'}; FILE *pFile = _wfopen(wszFileName, wszOpenMode); if(pFile == NULL) { return 2; } // 写入位图文件头 fseek(pFile, 0, SEEK_SET); fwrite(&(m_BMPFile->FileHeader), sizeof(m_BMPFile->FileHeader), 1, pFile); // 写入位图信息头 fwrite(&(m_BMPFile->InfoHeader), sizeof(m_BMPFile->InfoHeader), 1, pFile); // 写入位图数据 LONG BitsPerPixel = m_BMPFile->InfoHeader.biBitCount; LONG LineByteCnt = (m_RealImageWidth*BitsPerPixel)/8; // 不需要四字节对齐处理 if(0 == LineByteCnt%4) { fwrite(m_BMPFile->BMPData, m_RealImageDataSize, 1, pFile); } else { BYTE *WTDataBuf = m_BMPFile->BMPData; LONG WTSize = 3*m_RealImageWidth; int FillOffset = 4 - LineByteCnt%4; BYTE ZeroFill = 0x00; for(int iY=0; iY<m_RealImageHeight; iY++) { fwrite(WTDataBuf, WTSize, 1, pFile); fwrite(&ZeroFill, sizeof(BYTE), FillOffset, pFile); WTDataBuf += WTSize; } } fclose(pFile); return 0; } //--------------------------------------------------------------------------- void TBMPHelper::BRSwitch(void) { if(NULL == m_BMPFile->BMPData) { return; } BYTE Temp; DWORD MaxDataIndex = m_RealImageDataSize - 1; for(DWORD i=0; i<MaxDataIndex; i+=3) { Temp = m_BMPFile->BMPData[i+2]; m_BMPFile->BMPData[i+2] = m_BMPFile->BMPData[i]; m_BMPFile->BMPData[i] = Temp; } } //--------------------------------------------------------------------------- void TBMPHelper::BMPReverseV(void) { if(NULL == m_BMPFile->BMPData) { return; } if(m_RealImageWidth <= 0 || m_RealImageHeight <= 0) { return; } int HalfV = m_RealImageHeight/2; int MoveSize = 3*m_RealImageWidth; BYTE *DataBuf = new BYTE[MoveSize]; BYTE *UpPos = m_BMPFile->BMPData; BYTE *DownPos = m_BMPFile->BMPData + MoveSize*(m_RealImageHeight - 1); for(int iY=0; iY<HalfV; iY++) { memmove(DataBuf, UpPos, MoveSize); memmove(UpPos, DownPos, MoveSize); memmove(DownPos, DataBuf, MoveSize); UpPos += MoveSize; DownPos -= MoveSize; } delete DataBuf; } //---------------------------------------------------------------------------