MV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) {
const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK;
const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK;
const MV32 res = {
scaled_y(mv->row, sf) + y_off_q4,
scaled_x(mv->col, sf) + x_off_q4
};
return res;
}
static MV32 scaled_mv(const MV *mv, const struct scale_factors *scale) {
const MV32 res = {
scaled_y(mv->row, scale) + scale->y_offset_q4,
scaled_x(mv->col, scale) + scale->x_offset_q4
};
return res;
}
void vp9_setup_scale_factors_for_frame(struct scale_factors *sf,
int other_w, int other_h,
int this_w, int this_h) {
if (!check_scale_factors(other_w, other_h, this_w, this_h)) {
sf->x_scale_fp = REF_INVALID_SCALE;
sf->y_scale_fp = REF_INVALID_SCALE;
return;
}
sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
sf->x_step_q4 = scaled_x(16, sf);
sf->y_step_q4 = scaled_y(16, sf);
if (vp9_is_scaled(sf)) {
sf->scale_value_x = scaled_x;
sf->scale_value_y = scaled_y;
} else {
sf->scale_value_x = unscaled_value;
sf->scale_value_y = unscaled_value;
}
// TODO(agrange): Investigate the best choice of functions to use here
// for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
// to do at full-pel offsets. The current selection, where the filter is
// applied in one direction only, and not at all for 0,0, seems to give the
// best quality, but it may be worth trying an additional mode that does
// do the filtering on full-pel.
if (sf->x_step_q4 == 16) {
if (sf->y_step_q4 == 16) {
// No scaling in either direction.
sf->predict[0][0][0] = vp9_convolve_copy;
sf->predict[0][0][1] = vp9_convolve_avg;
sf->predict[0][1][0] = vp9_convolve8_vert;
sf->predict[0][1][1] = vp9_convolve8_avg_vert;
sf->predict[1][0][0] = vp9_convolve8_horiz;
sf->predict[1][0][1] = vp9_convolve8_avg_horiz;
} else {
// No scaling in x direction. Must always scale in the y direction.
sf->predict[0][0][0] = vp9_convolve8_vert;
sf->predict[0][0][1] = vp9_convolve8_avg_vert;
sf->predict[0][1][0] = vp9_convolve8_vert;
sf->predict[0][1][1] = vp9_convolve8_avg_vert;
sf->predict[1][0][0] = vp9_convolve8;
sf->predict[1][0][1] = vp9_convolve8_avg;
}
} else {
if (sf->y_step_q4 == 16) {
// No scaling in the y direction. Must always scale in the x direction.
sf->predict[0][0][0] = vp9_convolve8_horiz;
sf->predict[0][0][1] = vp9_convolve8_avg_horiz;
sf->predict[0][1][0] = vp9_convolve8;
sf->predict[0][1][1] = vp9_convolve8_avg;
sf->predict[1][0][0] = vp9_convolve8_horiz;
sf->predict[1][0][1] = vp9_convolve8_avg_horiz;
} else {
// Must always scale in both directions.
sf->predict[0][0][0] = vp9_convolve8;
sf->predict[0][0][1] = vp9_convolve8_avg;
sf->predict[0][1][0] = vp9_convolve8;
sf->predict[0][1][1] = vp9_convolve8_avg;
sf->predict[1][0][0] = vp9_convolve8;
sf->predict[1][0][1] = vp9_convolve8_avg;
}
}
// 2D subpel motion always gets filtered in both directions
sf->predict[1][1][0] = vp9_convolve8;
sf->predict[1][1][1] = vp9_convolve8_avg;
}
static void set_offsets_with_scaling(struct scale_factors *scale,
int row, int col) {
scale->x_offset_q4 = scaled_x(col << SUBPEL_BITS, scale) & SUBPEL_MASK;
scale->y_offset_q4 = scaled_y(row << SUBPEL_BITS, scale) & SUBPEL_MASK;
}