void CDicomViewerView::DrawDicomImage(CDC* pDC)
{
CRect clientRect;
this->GetClientRect(&clientRect);
int nWidth=clientRect.Width(),nHeight=clientRect.Height();
CDC MemDC; //首先定义一个显示设备对象
CBitmap MemBitmap;//定义一个位图对象
//随后建立与屏幕显示兼容的内存显示设备
MemDC.CreateCompatibleDC(NULL);
//这时还不能绘图，因为没有地方画 ^_^
//下面建立一个与屏幕显示兼容的位图，至于位图的大小嘛，可以用窗口的大小
MemBitmap.CreateCompatibleBitmap(pDC,nWidth,nHeight);
//将位图选入到内存显示设备中
//只有选入了位图的内存显示设备才有地方绘图，画到指定的位图上
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
//先用背景色将位图清除干净，这里我用的是白色作为背景
//你也可以用自己应该用的颜色
MemDC.FillSolidRect(0,0,nWidth,nHeight,RGB(0,0,0));
CDicomViewerDoc* pDoc = GetDocument();
if(pDoc->m_pDicomImage != 0){
E_DecompressionColorSpaceConversion opt_decompCSconversion = EDC_photometricInterpretation;
E_UIDCreation opt_uidcreation = EUC_default;
E_PlanarConfiguration opt_planarconfig = EPC_default;
OFBool opt_verbose = OFFalse;
DJDecoderRegistration::registerCodecs(
opt_decompCSconversion,
opt_uidcreation,
opt_planarconfig,
opt_verbose);
//根据传输语法构造 DicomImage 从 fstart 帧开始一共 fcount 帧
DicomImage *pDicomImg = pDoc->m_pDicomImage;//new DicomImage(pDoc->m_pFilePathName);
//DicomImage *pNewDicomImg = pDicomImg->createScaledImage((const unsigned long)1024,1024);
LPBITMAPINFOHEADER m_lpBMIH = (LPBITMAPINFOHEADER) new char [sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * 256];
m_lpBMIH->biSize = sizeof(BITMAPINFOHEADER);
m_lpBMIH->biWidth = pDicomImg->getWidth();
m_lpBMIH->biHeight = pDicomImg->getHeight();
m_lpBMIH->biPlanes = 1;
m_lpBMIH->biBitCount = 24;
m_lpBMIH->biCompression = BI_RGB;
m_lpBMIH->biSizeImage = 0;
m_lpBMIH->biXPelsPerMeter = 0;
m_lpBMIH->biYPelsPerMeter = 0;
pDicomImg->setWindow(pDoc->m_dCurrentWindowCenter, pDoc->m_dCurrentWindowWidth);
//得到 DICOM文件第 frame 的 DIB数据(假设是 24 位的)
unsigned long bufSize = 0;
void* m_pDicomDibits;
bufSize =pDicomImg->createWindowsDIB(m_pDicomDibits, bufSize, 0, 24, 1, 1);
double originalX = (clientRect.Width() - m_lpBMIH->biWidth)/2;
double originalY = (clientRect.Height() - m_lpBMIH->biHeight)/2;
StretchDIBits (MemDC.GetSafeHdc(),originalX,originalY, m_lpBMIH->biWidth, m_lpBMIH ->biHeight,0,0,m_lpBMIH->biWidth,m_lpBMIH->biHeight,
m_pDicomDibits, (LPBITMAPINFO) m_lpBMIH,DIB_RGB_COLORS,SRCCOPY);
delete m_pDicomDibits;
}
//将内存中的图拷贝到屏幕上进行显示
pDC->BitBlt(0,0,nWidth,nHeight,&MemDC,0,0,SRCCOPY);
MemBitmap.DeleteObject();
MemDC.DeleteDC();
}
bool ImageInstance::dcm2bmpHelper(DicomImage &dcmImage, QPixmap &pixmap)
{
BITMAPFILEHEADER lpfh;
BITMAPINFOHEADER lpih;
RGBQUAD palette[256];
memset(&lpfh, 0, sizeof(BITMAPFILEHEADER));
lpfh.bfType = 0x4d42; //'B''M'
lpfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(palette);
memset(&lpih, 0, sizeof(BITMAPINFOHEADER));
lpih.biSize = sizeof(BITMAPINFOHEADER);
lpih.biWidth = dcmImage.getWidth();
lpih.biHeight = dcmImage.getHeight();
lpih.biCompression = BI_RGB;
lpih.biBitCount = 8;
lpih.biPlanes = 1;
memset(palette, 0, sizeof(palette));
for (int i = 0; i < 256; ++i) {
palette[i].rgbBlue = i;
palette[i].rgbGreen = i;
palette[i].rgbRed = i;
}
void *pDIB = NULL;
int size = dcmImage.createWindowsDIB(pDIB, 0, 0, 8, 1, 1);
//lpih.biSizeImage = size;
lpfh.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(palette) + size;
QByteArray bmp;
bmp.append((char*)&lpfh, sizeof(BITMAPFILEHEADER));
bmp.append((char*)&lpih, sizeof(BITMAPINFOHEADER));
bmp.append((char*)palette, sizeof(palette));
bmp.append((char*)pDIB, size);
delete pDIB;
return pixmap.loadFromData(bmp);
}