// emit one filtered output row
static void ApplyFilter(SmoothParams* const p) {
const uint16_t* const average = p->average_;
const int w = p->width_;
const int16_t* const correction = p->correction_;
#if defined(USE_DITHERING)
const uint8_t* const dither = kOrderedDither[p->row_ % DSIZE];
#endif
uint8_t* const dst = p->dst_;
int x;
for (x = 0; x < w; ++x) {
const int v = dst[x];
if (v < p->max_ && v > p->min_) {
const int c = (v << DFIX) + correction[average[x] - (v << LFIX)];
#if defined(USE_DITHERING)
dst[x] = clip_8b(c + dither[x % DSIZE]);
#else
dst[x] = clip_8b(c);
#endif
}
}
p->dst_ += p->stride_; // advance output pointer
}
static void DitherCombine8x8_C(const uint8_t* dither, uint8_t* dst,
int dst_stride) {
int i, j;
for (j = 0; j < 8; ++j) {
for (i = 0; i < 8; ++i) {
const int delta0 = dither[i] - VP8_DITHER_AMP_CENTER;
const int delta1 =
(delta0 + VP8_DITHER_DESCALE_ROUNDER) >> VP8_DITHER_DESCALE;
dst[i] = clip_8b((int)dst[i] + delta1);
}
dst += dst_stride;
dither += 8;
}
}
