MFC - Blurry / Pixelized BMP with StretchDIBits -


i using stretchdibits function , during display of bitmap, can see displayed in 2 different ways such below :

blurry bmp pixel bmp

the thing doing updating bmp buffer whenever new data.

please find below associated code used display bitmap.

if (pbmpbuffer) {     lpbitmapinfo pbmpinfo;     pbmpinfo = (lpbitmapinfo) new byte[sizeof(bitmapinfoheader) + 256 * sizeof(rgbquad)];      pbmpinfo->bmiheader.bisize = sizeof(bitmapinfoheader);     pbmpinfo->bmiheader.biwidth = m_izsize;     pbmpinfo->bmiheader.biheight = m_ixsize;     pbmpinfo->bmiheader.biplanes = 1;     pbmpinfo->bmiheader.bibitcount = 32;     pbmpinfo->bmiheader.bicompression = bi_rgb;     pbmpinfo->bmiheader.bisizeimage = m_ixsize * m_izsize;     pbmpinfo->bmiheader.bixpelspermeter = 0;     pbmpinfo->bmiheader.biypelspermeter = 0;     pbmpinfo->bmiheader.biclrused = 0;     pbmpinfo->bmiheader.biclrimportant = 0;      setstretchbltmode(pdc->m_hdc, stretch_halftone);     stretchdibits(pdc->m_hdc,                   rectbmp.left,                   rectbmp.top,                   rectbmp.width(),                   rectbmp.height(),                   0,                   0,                   m_izsize,                   m_ixsize,                   pbmpbuffer,                   pbmpinfo,                   dib_rgb_colors,                   srccopy);      delete[] pbmpinfo; }

i have bitmap "blurry" look. in advance.

you use gdi+ instead of gdi , select bicubic interpolation algorithm used when images scaled or rotated. see gdiplus::graphics::setinterpolationmode

notice gdi+ going slower gdi.. option using opengl example...


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