zoom_filter_mmx.cpp

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#include <algorithm>
#include <cstdint>
 
#include "visualisations/goom/zoom_filters.h"
 
#ifdef MMX
static   constexpr uint8_t  BUFFPOINTNB   { 16     };
//static constexpr uint16_t BUFFPOINTMASK { 0xffff };
//static constexpr uint8_t  BUFFINCR      { 0xff   };
 
#include "mmx.h"
 
//static constexpr uint8_t sqrtperte { 16 };
// faire : a % sqrtperte <=> a & pertemask
static constexpr uint8_t PERTEMASK { 0xf };
// faire : a / sqrtperte <=> a >> PERTEDEC
static constexpr uint8_t PERTEDEC { 4 };
 
extern "C" {
#include "libavutil/cpu.h"
}
 
int zoom_filter_mmx_supported () {
    return (av_get_cpu_flags() & AV_CPU_FLAG_MMX);
}
 
void zoom_filter_mmx (int prevX, int prevY,
                      const unsigned int *expix1, unsigned int *expix2,//NOLINT(readability-non-const-parameter)
                      const int *brutS, const int *brutD, int buffratio,
                      const GoomCoefficients &precalCoef)
{
    unsigned int ax = (prevX-1)<<PERTEDEC;
    unsigned int ay = (prevY-1)<<PERTEDEC;
    
    int bufsize = prevX * prevY;
 
    pxor_r2r(mm7,mm7);
    
    for (int loop=0; loop<bufsize; loop++)
    {
        int pos = 0;
        int coeffs = 0;
    
        int myPos = loop << 1;
        int myPos2 = myPos + 1;
        int brutSmypos = brutS[myPos];
        
        int px = brutSmypos +
             (((brutD[myPos] - brutSmypos)*buffratio) >> BUFFPOINTNB);
 
        brutSmypos = brutS[myPos2];
        int py = brutSmypos +
             (((brutD[myPos2] - brutSmypos)*buffratio) >> BUFFPOINTNB);
 
        px = std::max(px, 0);
        py = std::max(py, 0);
 
        if ((py>=(int)ay) || (px>=(int)ax)) 
        {
            pos=coeffs=0;
        }
        else {
            pos = ((px >> PERTEDEC) + prevX * (py >> PERTEDEC));
            /* coef en modulo 15 */
            coeffs = precalCoef [px & PERTEMASK][py & PERTEMASK];
        }
 
        int posplusprevX = pos + prevX;
            
        movd_m2r(coeffs, mm6);
 
        /* recuperation des deux premiers pixels dans mm0 et mm1 */
        movq_m2r(expix1[pos], mm0); /* b1-v1-r1-a1-b2-v2-r2-a2 */
        movq_r2r(mm0, mm1);         /* b1-v1-r1-a1-b2-v2-r2-a2 */
 
        /* depackage du premier pixel */
        punpcklbw_r2r(mm7, mm0);    /* 00-b2-00-v2-00-r2-00-a2 */
        movq_r2r(mm6, mm5);         /* xx-xx-xx-xx-c4-c3-c2-c1 */
 
        /* depackage du 2ieme pixel */
        punpckhbw_r2r(mm7, mm1);    /* 00-b1-00-v1-00-r1-00-a1 */
 
        /* extraction des coefficients... */
        punpcklbw_r2r(mm5, mm6);    /* c4-c4-c3-c3-c2-c2-c1-c1 */
        movq_r2r(mm6, mm4);         /* c4-c4-c3-c3-c2-c2-c1-c1 */
        movq_r2r(mm6, mm5);         /* c4-c4-c3-c3-c2-c2-c1-c1 */
        punpcklbw_r2r(mm5, mm6);    /* c2-c2-c2-c2-c1-c1-c1-c1 */
        punpckhbw_r2r(mm5, mm4);    /* c4-c4-c4-c4-c3-c3-c3-c3 */
        
        movq_r2r(mm6, mm3);         /* c2-c2-c2-c2-c1-c1-c1-c1 */
        punpcklbw_r2r(mm7, mm6);    /* 00-c1-00-c1-00-c1-00-c1 */
        punpckhbw_r2r(mm7, mm3);    /* 00-c2-00-c2-00-c2-00-c2 */
 
        /* multiplication des pixels par les coefficients */
        pmullw_r2r(mm6, mm0);       /* c1*b2-c1*v2-c1*r2-c1*a2 */
        pmullw_r2r(mm3, mm1);       /* c2*b1-c2*v1-c2*r1-c2*a1 */
        paddw_r2r(mm1, mm0);
        
        /* ...extraction des 2 derniers coefficients */
        movq_r2r(mm4, mm5);         /* c4-c4-c4-c4-c3-c3-c3-c3 */
        punpcklbw_r2r(mm7, mm4);    /* 00-c3-00-c3-00-c3-00-c3 */
        punpckhbw_r2r(mm7, mm5);    /* 00-c4-00-c4-00-c4-00-c4 */
        
        /* ajouter la longueur de ligne a esi */
        /* recuperation des 2 derniers pixels */
        movq_m2r(expix1[posplusprevX], mm1);
        movq_r2r(mm1, mm2);
        
        /* depackage des pixels */
        punpcklbw_r2r(mm7, mm1);
        punpckhbw_r2r(mm7, mm2);
        
        /* multiplication pas les coeffs */
        pmullw_r2r(mm4, mm1);
        pmullw_r2r(mm5, mm2);
        
        /* ajout des valeurs obtenues de iso8859-15 à la valeur finale */
        paddw_r2r(mm1, mm0);
        paddw_r2r(mm2, mm0);
        
        /* division par 256 = 16+16+16+16, puis repackage du pixel final */
        psrlw_i2r(8, mm0);
        packuswb_r2r(mm7, mm0);
        movd_r2m(mm0,expix2[loop]);
    }
    emms();
}
 
#else
 
int zoom_filter_mmx_supported () {
    return 0;
}
 
void zoom_filter_mmx ([[maybe_unused]] int prevX,
                      [[maybe_unused]] int prevY,
                      [[maybe_unused]] const unsigned int *expix1,
                      [[maybe_unused]] unsigned int *expix2,
                      [[maybe_unused]] const int *brutS,
                      [[maybe_unused]] const int *brutD,
                      [[maybe_unused]] int buffratio,
                      [[maybe_unused]] const GoomCoefficients &precalCoef)
{
}
 
#endif
 
/*
 * vim:ts=4:sw=4:ai:et:si:sts=4
 */