Fast Bitmap Rotation and Scaling
By Steven Mortimer, July 01, 2001
The more programmers learn, the more we forget. This article highlights a bit of forgotten knowledge in the form of a fast algorithm for bitmap scaling and rotation - vintage knowledge from Amiga days.
July 2001/Fast Bitmap Rotation and Scaling/Listing 1
Listing 1: cdib.h — Declaration of CDIB
///////////////////////////////////////////////////////////////////
class CDIB
{
public:
CDIB();
~CDIB();
bool Create(HDC hdcSrc, int iSrcX, int iSrcY,
int iWidth, int iHeight);
void Release();
// Varibles
HDC m_hdc; // HDC of the DIB
HBITMAP m_hbm; // HBITMAP of the DIB
HBITMAP m_hbmOld; // old HBITMAP from the hdc
WORD* m_pSrcBits; // pointer to DIB pixel array
int m_iWidth; // Width of the DIB
int m_iHeight; // Height of the DIB
int m_iSWidth; // Storage Width (in bytes)
};
/* End of File */
