strTransform.h

//*@@@+++@@@@******************************************************************
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#ifndef WMI_STRTRANSFORM_H
#define WMI_STRTRANSFORM_H

#include "windowsmediaphoto.h"

#define COMPUTE_CORNER_PRED_DIFF(a, b) (*(a) -= (b))
#define COMPUTE_CORNER_PRED_ADD(a, b) (*(a) += (b))

/** 2x2 foward DCT == 2x2 inverse DCT **/
Void strDCT2x2dn(PixelI *, PixelI *, PixelI *, PixelI *);
Void strDCT2x2up(PixelI *, PixelI *, PixelI *, PixelI *);
Void FOURBUTTERFLY_HARDCODED1(PixelI *p);

/** 2x2 dct of a group of 4**/
#define FOURBUTTERFLY(p, i00, i01, i02, i03, i10, i11, i12, i13,\
    i20, i21, i22, i23, i30, i31, i32, i33)		                \
    strDCT2x2dn(&p[i00], &p[i01], &p[i02], &p[i03]);			\
    strDCT2x2dn(&p[i10], &p[i11], &p[i12], &p[i13]);			\
    strDCT2x2dn(&p[i20], &p[i21], &p[i22], &p[i23]);			\
    strDCT2x2dn(&p[i30], &p[i31], &p[i32], &p[i33])

#endif // WMI_STRTRANSFORM_H