I'm trying to create a 256 graylevel CBitmap object, having the pixel values retrieved from a BYTE array.
I think I have to setup a BITMAPINFO structure, define the palette and then allocate the CBitmap object and set the bit values, but I can't manage with the palette definition stuff.
This is my code:
BITMAPINFO bmInfo;
BITMAPINFOHEADER &bmInfohdr = (BITMAPINFOHEADER)bmInfo.bmiHeader;
bmInfohdr.biSize = 40 + 255; //I think it's not of use
bmInfohdr.biWidth = x;
bmInfohdr.biHeight = y;
bmInfohdr.biPlanes=1;
bmInfohdr.biBitCount=8;
bmInfohdr.biCompression=0;
bmInfohdr.biSizeImage=0;
bmInfohdr.biXPelsPerMeter = 0;
bmInfohdr.biYPelsPerMeter = 0;
bmInfohdr.biClrUsed = 0;
bmInfohdr.biClrImportant = 0;
// should I allocate memory further than the
// bmColors[1]?? anyway the compiler gives an
// error for type mismatch!
//bmInfo.bmiColors = (RGBQUAD *)
malloc(sizeof(RGBQUAD) * 256);
// here I define the 256 graylevel palette
for (int i=0; i<256; i++)
{
bmInfo.bmiColors.rgbRed = i;
bmInfo.bmiColors.rgbGreen = i;
bmInfo.bmiColors.rgbBlue = i;
}
BYTE *matrix;
matrix = (BYTE*)malloc(size*sizeof(BYTE));
// here I put the BYTE values of the pixels
CDC *pdcDest = this->GetDC();
HBITMAP hBmp = CreateDIBitmap( pdcDest->m_hDC,
&bmInfohdr,
CBM_INIT,
matrix,
&bmInfo,
DIB_RGB_COLORS);
m_bmpBitmap.Attach( hBmp );
But when I load the m_bmpBitmap to screen, it's empty!
Can someone help me?
thanks,
francesco
I think I have to setup a BITMAPINFO structure, define the palette and then allocate the CBitmap object and set the bit values, but I can't manage with the palette definition stuff.
This is my code:
BITMAPINFO bmInfo;
BITMAPINFOHEADER &bmInfohdr = (BITMAPINFOHEADER)bmInfo.bmiHeader;
bmInfohdr.biSize = 40 + 255; //I think it's not of use
bmInfohdr.biWidth = x;
bmInfohdr.biHeight = y;
bmInfohdr.biPlanes=1;
bmInfohdr.biBitCount=8;
bmInfohdr.biCompression=0;
bmInfohdr.biSizeImage=0;
bmInfohdr.biXPelsPerMeter = 0;
bmInfohdr.biYPelsPerMeter = 0;
bmInfohdr.biClrUsed = 0;
bmInfohdr.biClrImportant = 0;
// should I allocate memory further than the
// bmColors[1]?? anyway the compiler gives an
// error for type mismatch!
//bmInfo.bmiColors = (RGBQUAD *)
malloc(sizeof(RGBQUAD) * 256);
// here I define the 256 graylevel palette
for (int i=0; i<256; i++)
{
bmInfo.bmiColors.rgbRed = i;
bmInfo.bmiColors.rgbGreen = i;
bmInfo.bmiColors.rgbBlue = i;
}
BYTE *matrix;
matrix = (BYTE*)malloc(size*sizeof(BYTE));
// here I put the BYTE values of the pixels
CDC *pdcDest = this->GetDC();
HBITMAP hBmp = CreateDIBitmap( pdcDest->m_hDC,
&bmInfohdr,
CBM_INIT,
matrix,
&bmInfo,
DIB_RGB_COLORS);
m_bmpBitmap.Attach( hBmp );
But when I load the m_bmpBitmap to screen, it's empty!
Can someone help me?
thanks,
francesco