CBitmap 见msdn 操作设备相关位图
CDib 操作设备相关位图：见visual c++.net 6
// cdib.h declaration for Inside Visual C++ CDib class
#ifndef _INSIDE_VISUAL_CPP_CDIB
#define _INSIDE_VISUAL_CPP_CDIB
class CDib : public CObject
{
enum Alloc {noAlloc, crtAlloc, heapAlloc};
DECLARE_SERIAL(CDib)
public:
LPVOID m_lpvColorTable;
HBITMAP m_hBitmap;
LPBYTE m_lpImage; // starting address of DIB bits
LPBITMAPINFOHEADER m_lpBMIH; // buffer containing the BITMAPINFOHEADER
private:
HGLOBAL m_hGlobal; // For external windows we need to free;
// could be allocated by this class or allocated externally
Alloc m_nBmihAlloc;
Alloc m_nImageAlloc;
DWORD m_dwSizeImage; // of bits -- not BITMAPINFOHEADER or BITMAPFILEHEADER
int m_nColorTableEntries;
HANDLE m_hFile;
HANDLE m_hMap;
LPVOID m_lpvFile;
HPALETTE m_hPalette;
public:
CDib();
CDib(CSize size, int nBitCount); // builds BITMAPINFOHEADER
~CDib();
int GetSizeImage() {return m_dwSizeImage;}
int GetSizeHeader()
{return sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries;}
CSize GetDimensions();
BOOL AttachMapFile(const char* strPathname, BOOL bShare = FALSE);
BOOL CopyToMapFile(const char* strPathname);
BOOL AttachMemory(LPVOID lpvMem, BOOL bMustDelete = FALSE, HGLOBAL hGlobal = NULL);
BOOL Draw(CDC* pDC, CPoint origin, CSize size); // until we implemnt CreateDibSection
HBITMAP CreateSection(CDC* pDC = NULL);
UINT UsePalette(CDC* pDC, BOOL bBackground = FALSE);
BOOL MakePalette();
BOOL SetSystemPalette(CDC* pDC);
BOOL Compress(CDC* pDC, BOOL bCompress = TRUE); // FALSE means decompress
HBITMAP CreateBitmap(CDC* pDC);
BOOL Read(CFile* pFile);
BOOL ReadSection(CFile* pFile, CDC* pDC = NULL);
BOOL Write(CFile* pFile);
void Serialize(CArchive& ar);
void Empty();
private:
void DetachMapFile();
void ComputePaletteSize(int nBitCount);
void ComputeMetrics();
};
#endif // _INSIDE_VISUAL_CPP_CDIB
// 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::CDib()
{
m_hFile = NULL;
m_hBitmap = NULL;
m_hPalette = NULL;
m_nBmihAlloc = m_nImageAlloc = noAlloc;
Empty();
}
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::~CDib()
{
Empty();
}
CSize CDib::GetDimensions()
{
if(m_lpBMIH == NULL) return CSize(0, 0);
return CSize((int) m_lpBMIH->biWidth, (int) m_lpBMIH->biHeight);
}
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;
}
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;
}
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;
}
UINT CDib::UsePalette(CDC* pDC, BOOL bBackground /**//* = FALSE */)
{
if(m_hPalette == NULL) return 0;
HDC hdc = pDC->GetSafeHdc();
::SelectPalette(hdc, m_hPalette, bBackground);
return ::RealizePalette(hdc);
}
BOOL CDib::Draw(CDC* pDC, CPoint origin, CSize size)
{
if(m_lpBMIH == NULL) return FALSE;
if(m_hPalette != NULL) {
::SelectPalette(pDC->GetSafeHdc(), m_hPalette, TRUE);
}
pDC->SetStretchBltMode(COLORONCOLOR);
::StretchDIBits(pDC->GetSafeHdc(), origin.x, origin.y, size.cx, size.cy,
0, 0, m_lpBMIH->biWidth, m_lpBMIH->biHeight,
m_lpImage, (LPBITMAPINFO) m_lpBMIH, DIB_RGB_COLORS, SRCCOPY);
return TRUE;
}
HBITMAP CDib::CreateSection(CDC* pDC /**//* = NULL */)
{
if(m_lpBMIH == NULL) return NULL;
if(m_lpImage != NULL) return NULL; // can only do this if image doesn't exist
m_hBitmap = ::CreateDIBSection(pDC->GetSafeHdc(), (LPBITMAPINFO) m_lpBMIH,
DIB_RGB_COLORS, (LPVOID*) &m_lpImage, NULL, 0);
ASSERT(m_lpImage != NULL);
return m_hBitmap;
}
BOOL CDib::MakePalette()
{
// makes a logical palette (m_hPalette) from the DIB's color table
// this palette will be selected and realized prior to drawing the DIB
if(m_nColorTableEntries == 0) return FALSE;
if(m_hPalette != NULL) ::DeleteObject(m_hPalette);
TRACE("CDib::MakePalette -- m_nColorTableEntries = %d\n", m_nColorTableEntries);
LPLOGPALETTE pLogPal = (LPLOGPALETTE) new char[2 * sizeof(WORD) +
m_nColorTableEntries * sizeof(PALETTEENTRY)];
pLogPal->palVersion = 0x300;
pLogPal->palNumEntries = m_nColorTableEntries;
LPRGBQUAD pDibQuad = (LPRGBQUAD) m_lpvColorTable;
for(int i = 0; i < m_nColorTableEntries; i++) {
pLogPal->palPalEntry[i].peRed = pDibQuad->rgbRed;
pLogPal->palPalEntry[i].peGreen = pDibQuad->rgbGreen;
pLogPal->palPalEntry[i].peBlue = pDibQuad->rgbBlue;
pLogPal->palPalEntry[i].peFlags = 0;
pDibQuad++;
}
m_hPalette = ::CreatePalette(pLogPal);
delete pLogPal;
return TRUE;
}
BOOL CDib::SetSystemPalette(CDC* pDC)
{
// if the DIB doesn't have a color table, we can use the system's halftone palette
if(m_nColorTableEntries != 0) return FALSE;
m_hPalette = ::CreateHalftonePalette(pDC->GetSafeHdc());
return TRUE;
}
HBITMAP CDib::CreateBitmap(CDC* pDC)
{
if (m_dwSizeImage == 0) return NULL;
HBITMAP hBitmap = ::CreateDIBitmap(pDC->GetSafeHdc(), m_lpBMIH,
CBM_INIT, m_lpImage, (LPBITMAPINFO) m_lpBMIH, DIB_RGB_COLORS);
ASSERT(hBitmap != NULL);
return hBitmap;
}
BOOL CDib::Compress(CDC* pDC, BOOL bCompress /**//* = TRUE */)
{
// 1. makes GDI bitmap from existing DIB
// 2. makes a new DIB from GDI bitmap with compression
// 3. cleans up the original DIB
// 4. puts the new DIB in the object
if((m_lpBMIH->biBitCount != 4) && (m_lpBMIH->biBitCount != 8)) return FALSE;
// compression supported only for 4 bpp and 8 bpp DIBs
if(m_hBitmap) return FALSE; // can't compress a DIB Section!
TRACE("Compress: original palette size = %d\n", m_nColorTableEntries);
HDC hdc = pDC->GetSafeHdc();
HPALETTE hOldPalette = ::SelectPalette(hdc, m_hPalette, FALSE);
HBITMAP hBitmap; // temporary
if((hBitmap = CreateBitmap(pDC)) == NULL) return FALSE;
int nSize = sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries;
LPBITMAPINFOHEADER lpBMIH = (LPBITMAPINFOHEADER) new char[nSize];
memcpy(lpBMIH, m_lpBMIH, nSize); // new header
if(bCompress) {
switch (lpBMIH->biBitCount) {
case 4:
lpBMIH->biCompression = BI_RLE4;
break;
case 8:
lpBMIH->biCompression = BI_RLE8;
break;
default:
ASSERT(FALSE);
}
// calls GetDIBits with null data pointer to get size of compressed DIB
if(!::GetDIBits(pDC->GetSafeHdc(), hBitmap, 0, (UINT) lpBMIH->biHeight,
NULL, (LPBITMAPINFO) lpBMIH, DIB_RGB_COLORS)) {
AfxMessageBox("Unable to compress this DIB");
// probably a problem with the color table
::DeleteObject(hBitmap);
delete [] lpBMIH;
::SelectPalette(hdc, hOldPalette, FALSE);
return FALSE;
}
if (lpBMIH->biSizeImage == 0) {
AfxMessageBox("Driver can't do compression");
::DeleteObject(hBitmap);
delete [] lpBMIH;
::SelectPalette(hdc, hOldPalette, FALSE);
return FALSE;
}
else {
m_dwSizeImage = lpBMIH->biSizeImage;
}
}
else {
lpBMIH->biCompression = BI_RGB; // decompress
// figure the image size from the bitmap width and height
DWORD dwBytes = ((DWORD) lpBMIH->biWidth * lpBMIH->biBitCount) / 32;
if(((DWORD) lpBMIH->biWidth * lpBMIH->biBitCount) % 32) {
dwBytes++;
}
dwBytes *= 4;
m_dwSizeImage = dwBytes * lpBMIH->biHeight; // no compression
lpBMIH->biSizeImage = m_dwSizeImage;
}
// second GetDIBits call to make DIB
LPBYTE lpImage = (LPBYTE) new char[m_dwSizeImage];
VERIFY(::GetDIBits(pDC->GetSafeHdc(), hBitmap, 0, (UINT) lpBMIH->biHeight,
lpImage, (LPBITMAPINFO) lpBMIH, DIB_RGB_COLORS));
TRACE("dib successfully created - height = %d\n", lpBMIH->biHeight);
::DeleteObject(hBitmap);
Empty();
m_nBmihAlloc = m_nImageAlloc = crtAlloc;
m_lpBMIH = lpBMIH;
m_lpImage = lpImage;
ComputeMetrics();
ComputePaletteSize(m_lpBMIH->biBitCount);
MakePalette();
::SelectPalette(hdc, hOldPalette, FALSE);
TRACE("Compress: new palette size = %d\n", m_nColorTableEntries);
return TRUE;
}
BOOL CDib::Read(CFile* pFile)
{
// 1. read file header to get size of info hdr + color table
// 2. read info hdr (to get image size) and color table
// 3. read image
// can't use bfSize in file header
Empty();
int nCount, nSize;
BITMAPFILEHEADER bmfh;
try {
nCount = pFile->Read((LPVOID) &bmfh, sizeof(BITMAPFILEHEADER));
if(nCount != sizeof(BITMAPFILEHEADER)) {
throw new CUserException;
}
if(bmfh.bfType != 0x4d42) {
throw new CUserException;
}
nSize = bmfh.bfOffBits - sizeof(BITMAPFILEHEADER);
m_lpBMIH = (LPBITMAPINFOHEADER) new char[nSize];
m_nBmihAlloc = m_nImageAlloc = crtAlloc;
nCount = pFile->Read(m_lpBMIH, nSize); // info hdr & color table
ComputeMetrics();
ComputePaletteSize(m_lpBMIH->biBitCount);
MakePalette();
m_lpImage = (LPBYTE) new char[m_dwSizeImage];
nCount = pFile->Read(m_lpImage, m_dwSizeImage); // image only
}
catch(CException* pe) {
AfxMessageBox("Read error");
pe->Delete();
return FALSE;
}
return TRUE;
}
BOOL CDib::ReadSection(CFile* pFile, CDC* pDC /**//* = NULL */)
{
// new function reads BMP from disk and creates a DIB section
// allows modification of bitmaps from disk
// 1. read file header to get size of info hdr + color table
// 2. read info hdr (to get image size) and color table
// 3. create DIB section based on header parms
// 4. read image into memory that CreateDibSection allocates
Empty();
int nCount, nSize;
BITMAPFILEHEADER bmfh;
try {
nCount = pFile->Read((LPVOID) &bmfh, sizeof(BITMAPFILEHEADER));
if(nCount != sizeof(BITMAPFILEHEADER)) {
throw new CUserException;
}
if(bmfh.bfType != 0x4d42) {
throw new CUserException;
}
nSize = bmfh.bfOffBits - sizeof(BITMAPFILEHEADER);
m_lpBMIH = (LPBITMAPINFOHEADER) new char[nSize];
m_nBmihAlloc = crtAlloc;
m_nImageAlloc = noAlloc;
nCount = pFile->Read(m_lpBMIH, nSize); // info hdr & color table
if(m_lpBMIH->biCompression != BI_RGB) {
throw new CUserException;
}
ComputeMetrics();
ComputePaletteSize(m_lpBMIH->biBitCount);
MakePalette();
UsePalette(pDC);
m_hBitmap = ::CreateDIBSection(pDC->GetSafeHdc(), (LPBITMAPINFO) m_lpBMIH,
DIB_RGB_COLORS, (LPVOID*) &m_lpImage, NULL, 0);
ASSERT(m_lpImage != NULL);
nCount = pFile->Read(m_lpImage, m_dwSizeImage); // image only
}
catch(CException* pe) {
AfxMessageBox("ReadSection error");
pe->Delete();
return FALSE;
}
return TRUE;
}
BOOL CDib::Write(CFile* pFile)
{
BITMAPFILEHEADER bmfh;
bmfh.bfType = 0x4d42; // 'BM'
int nSizeHdr = sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * m_nColorTableEntries;
bmfh.bfSize = 0;
// bmfh.bfSize = sizeof(BITMAPFILEHEADER) + nSizeHdr + m_dwSizeImage;
// meaning of bfSize open to interpretation (bytes, words, dwords?) -- we won't use it
bmfh.bfReserved1 = bmfh.bfReserved2 = 0;
bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
sizeof(RGBQUAD) * m_nColorTableEntries;
try {
pFile->Write((LPVOID) &bmfh, sizeof(BITMAPFILEHEADER));
pFile->Write((LPVOID) m_lpBMIH, nSizeHdr);
pFile->Write((LPVOID) m_lpImage, m_dwSizeImage);
}
catch(CException* pe) {
pe->Delete();
AfxMessageBox("write error");
return FALSE;
}
return TRUE;
}
void CDib::Serialize(CArchive& ar)
{
DWORD dwPos;
dwPos = ar.GetFile()->GetPosition();
TRACE("CDib::Serialize -- pos = %d\n", dwPos);
ar.Flush();
dwPos = ar.GetFile()->GetPosition();
TRACE("CDib::Serialize -- pos = %d\n", dwPos);
if(ar.IsStoring()) {
Write(ar.GetFile());
}
else {
Read(ar.GetFile());
}
}
// helper functions
void CDib::ComputePaletteSize(int nBitCount)
{
if((m_lpBMIH == NULL) || (m_lpBMIH->biClrUsed == 0)) {
switch(nBitCount) {
case 1:
m_nColorTableEntries = 2;
break;
case 4:
m_nColorTableEntries = 16;
break;
case 8:
m_nColorTableEntries = 256;
break;
case 16:
case 24:
case 32:
m_nColorTableEntries = 0;
break;
default:
ASSERT(FALSE);
}
}
else {
m_nColorTableEntries = m_lpBMIH->biClrUsed;
}
ASSERT((m_nColorTableEntries >= 0) && (m_nColorTableEntries <= 256));
}
void CDib::ComputeMetrics()
{
if(m_lpBMIH->biSize != sizeof(BITMAPINFOHEADER)) {
TRACE("Not a valid Windows bitmap -- probably an OS/2 bitmap\n");
throw new CUserException;
}
m_dwSizeImage = m_lpBMIH->biSizeImage;
if(m_dwSizeImage == 0) {
DWORD dwBytes = ((DWORD) m_lpBMIH->biWidth * m_lpBMIH->biBitCount) / 32;
if(((DWORD) m_lpBMIH->biWidth * m_lpBMIH->biBitCount) % 32) {
dwBytes++;
}
dwBytes *= 4;
m_dwSizeImage = dwBytes * m_lpBMIH->biHeight; // no compression
}
m_lpvColorTable = (LPBYTE) m_lpBMIH + sizeof(BITMAPINFOHEADER);
}
void CDib::Empty()
{
// this is supposed to clean up whatever is in the DIB
DetachMapFile();
if(m_nBmihAlloc == crtAlloc) {
delete [] m_lpBMIH;
}
else if(m_nBmihAlloc == heapAlloc) {
::GlobalUnlock(m_hGlobal);
::GlobalFree(m_hGlobal);
}
if(m_nImageAlloc == crtAlloc) delete [] m_lpImage;
if(m_hPalette != NULL) ::DeleteObject(m_hPalette);
if(m_hBitmap != NULL) ::DeleteObject(m_hBitmap);
m_nBmihAlloc = m_nImageAlloc = noAlloc;
m_hGlobal = NULL;
m_lpBMIH = NULL;
m_lpImage = NULL;
m_lpvColorTable = NULL;
m_nColorTableEntries = 0;
m_dwSizeImage = 0;
m_lpvFile = NULL;
m_hMap = NULL;
m_hFile = NULL;
m_hBitmap = NULL;
m_hPalette = NULL;
}
void CDib::DetachMapFile()
{
if(m_hFile == NULL) return;
::UnmapViewOfFile(m_lpvFile);
::CloseHandle(m_hMap);
::CloseHandle(m_hFile);
m_hFile = NULL;
}