stretch_hvx_16.h

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#ifndef SOURCE_LOOKUP
#define SOURCE_LOOKUP(x) (x)
#define SOURCE_LOOKUP_AUTO
#endif

#ifndef SOURCE_TYPE
#define SOURCE_TYPE u16
#define SOURCE_TYPE_AUTO
#endif


#define SHIFT_L5    SHIFT_R5
#define SHIFT_L6    SHIFT_R6
#define SHIFT_L10   (16-SHIFT_L6)

#define X_003F      (X_07E0>>SHIFT_R5)

#define X_003E07C0  (X_F81F<<SHIFT_L6)
#define X_0001F800  (X_07E0<<SHIFT_L6)

#define X_07E0F81F  ((X_07E0<<16) | X_F81F)
#define X_F81F07E0  ((X_F81F<<16) | X_07E0)

#define X_F81FF81F  ((X_F81F<<16) | X_F81F)
#define X_07E007E0  ((X_07E0<<16) | X_07E0)

#define X_07C0F83F  (X_F81F07E0>>SHIFT_R5)

#if 0
#define HVX_DEBUG(x...)  direct_log_printf( NULL, x )
#else
#define HVX_DEBUG(x...)  do {} while (0)
#endif

/* stretch_hvx_up/down_16_KPI */( void             *dst,
                                  int               dpitch,
                                  const void       *src,
                                  int               spitch,
                                  int               width,
                                  int               height,
                                  int               dst_width,
                                  int               dst_height,
                                  const StretchCtx *ctx )
{
     long  x, y, r = 0;
     long  head    = ((((ulong) dst) & 2) >> 1) ^ (ctx->clip.x1 & 1);
     long  cw      = ctx->clip.x2 - ctx->clip.x1 + 1;
     long  ch      = ctx->clip.y2 - ctx->clip.y1 + 1;
     long  tail    = (cw - head) & 1;
     long  w2      = (cw - head) / 2;
     long  hfraq   = ((long)(width  - MINUS_1) << 18) / (long)(dst_width);
     long  vfraq   = ((long)(height - MINUS_1) << 18) / (long)(dst_height);
     long  dp4     = dpitch / 4;
     long  point0  = POINT_0 + ctx->clip.x1 * hfraq;
     long  point   = point0;
     long  line    = LINE_0 + ctx->clip.y1 * vfraq;
     long  ratios[cw];
     u32  *dst32;

#if defined (COLOR_KEY) || defined (KEY_PROTECT)
     u32   dt;
     u16   l_, h_;
#endif

     u32   _lbT[w2+8];
     u32   _lbB[w2+8];

     u32  *lbX;
     u32  *lbT = (u32*)((((ulong)(&_lbT[0])) + 31) & ~31);
     u32  *lbB = (u32*)((((ulong)(&_lbB[0])) + 31) & ~31);

     long  lineT = -2000;

     for (x=0; x<cw; x++) {
          ratios[x] = POINT_TO_RATIO( point, hfraq );

          point += hfraq;
     }

     HVX_DEBUG(" %s  %dx%d -> %dx%d  (0x%lx, 0x%lx) prot %lx, key %lx\n",
               __FUNCTION__, width, height, dst_width, dst_height, hfraq, vfraq, ctx->protect, ctx->key );

     dst += ctx->clip.x1 * 2 + ctx->clip.y1 * dpitch;

     dst32 = dst;

     if (head) {
          u32 dpT, dpB, L, R;

          u16 *dst16 = dst;

          point = point0;

          for (y=0; y<ch; y++) {
               long X = LINE_TO_RATIO( line, vfraq );

               const SOURCE_TYPE *srcT = src + spitch * LINE_T( line, vfraq );
               const SOURCE_TYPE *srcB = src + spitch * LINE_B( line, vfraq );

               /*
                * Horizontal interpolation
                */
               long pl = POINT_L( point, hfraq );
               HVX_DEBUG("h,%ld %lu  (%lu/%lu)   0x%x  0x%x\n", y, pl,
                         POINT_L( point, hfraq ), POINT_R( point, hfraq ), point, ratios[r] );
               D_ASSERT( pl >= 0 );
               D_ASSERT( pl < width-1 );
               L = SOURCE_LOOKUP(srcT[pl]);
               R = SOURCE_LOOKUP(srcT[pl+1]);

               dpT = (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                      ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800)) >> SHIFT_R6;

               L = SOURCE_LOOKUP(srcB[pl]);
               R = SOURCE_LOOKUP(srcB[pl+1]);

               dpB = (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                      ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800)) >> SHIFT_R6;

               /*
                * Vertical interpolation
                */
#if defined (COLOR_KEY) || defined (KEY_PROTECT)
               l_ = ((((((dpB & X_F81F) - (dpT & X_F81F))*X) >> SHIFT_R5) + (dpT & X_F81F)) & X_F81F) +
                    ((((((dpB>>SHIFT_R5) & X_003F) - ((dpT>>SHIFT_R5) & X_003F))*X) + (dpT & X_07E0)) & X_07E0);
#ifdef COLOR_KEY
               if ((l_ & MASK_RGB) != (COLOR_KEY))
#endif
#ifdef KEY_PROTECT
                    /* Write to destination with color key protection */
                    dst16[0] = ((l_ & MASK_RGB) == KEY_PROTECT) ? l_^1 : l_;
#else
                    /* Write to destination without color key protection */
                    dst16[0] = l_;
#endif
#else
               /* Write to destination without color key protection */
               dst16[0] = ((((((dpB & X_F81F) - (dpT & X_F81F))*X) >> SHIFT_R5) + (dpT & X_F81F)) & X_F81F) +
                          ((((((dpB>>SHIFT_R5) & X_003F) - ((dpT>>SHIFT_R5) & X_003F))*X) + (dpT & X_07E0)) & X_07E0);
#endif

               dst16 += dpitch / 2;
               line  += vfraq;
          }

          /* Adjust */
          point0 += hfraq;
          dst32   = dst + 2;

          /* Reset */
          line = LINE_0 + ctx->clip.y1 * vfraq;
     }

     /*
      * Scale line by line.
      */
     for (y=0; y<ch; y++) {
          long nlT = LINE_T( line, vfraq );

          D_ASSERT( nlT >= 0 );
          D_ASSERT( nlT < height-1 );

          /*
           * Fill line buffer(s) ?
           */
          if (nlT != lineT) {
               u32 L, R, dpT, dpB;
               const SOURCE_TYPE *srcT = src + spitch * nlT;
               const SOURCE_TYPE *srcB = src + spitch * (nlT + 1);
               long               diff = nlT - lineT;

               if (diff > 1) {
                    /*
                     * Two output pixels per step.
                     */
                    for (x=0, r=head, point=point0; x<w2; x++) {
                         /*
                          * Horizontal interpolation
                          */
                         long pl = POINT_L( point, hfraq );
                         HVX_DEBUG("%ld,%ld %lu  (%lu/%lu)   0x%x  0x%x\n", x, y, pl,
                                   POINT_L( point, hfraq ), POINT_R( point, hfraq ), point, ratios[r] );
                         D_ASSERT( pl >= 0 );
                         D_ASSERT( pl < width-1 );
                         L = SOURCE_LOOKUP(srcT[pl]);
                         R = SOURCE_LOOKUP(srcT[pl+1]);

                         dpT = (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                                ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800))
#ifdef WORDS_BIGENDIAN
                              << SHIFT_L10;
#else
                              >> SHIFT_R6;
#endif

                         L = SOURCE_LOOKUP(srcB[pl]);
                         R = SOURCE_LOOKUP(srcB[pl+1]);

                         dpB = (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                                ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800))
#ifdef WORDS_BIGENDIAN
                              << SHIFT_L10;
#else
                              >> SHIFT_R6;
#endif

                         point += hfraq;
                         r++;


                         pl = POINT_L( point, hfraq );
                         HVX_DEBUG("%ld,%ld %lu  (%lu/%lu)   0x%x  0x%x\n", x, y, pl,
                                   POINT_L( point, hfraq ), POINT_R( point, hfraq ), point, ratios[r] );
                         D_ASSERT( pl >= 0 );
                         D_ASSERT( pl < width-1 );

                         L = SOURCE_LOOKUP(srcT[pl]);
                         R = SOURCE_LOOKUP(srcT[pl+1]);

                         dpT |= (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                                 ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800))
#ifdef WORDS_BIGENDIAN
                              >> SHIFT_R6;
#else
                              << SHIFT_L10;
#endif

                         L = SOURCE_LOOKUP(srcB[pl]);
                         R = SOURCE_LOOKUP(srcB[pl+1]);

                         dpB |= (((((R & X_F81F)-(L & X_F81F))*ratios[r] + ((L & X_F81F)<<SHIFT_L6)) & X_003E07C0) + 
                                 ((((R & X_07E0)-(L & X_07E0))*ratios[r] + ((L & X_07E0)<<SHIFT_L6)) & X_0001F800))
#ifdef WORDS_BIGENDIAN
                              >> SHIFT_R6;
#else