| /* |
| * Copyright (c) 2013 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "./vp9_rtcd.h" |
| #include "vp9/common/vp9_filter.h" |
| #include "vp9/common/vp9_scale.h" |
| |
| static INLINE int scaled_x(int val, const struct scale_factors_common *sfc) { |
| return val * sfc->x_scale_fp >> REF_SCALE_SHIFT; |
| } |
| |
| static INLINE int scaled_y(int val, const struct scale_factors_common *sfc) { |
| return val * sfc->y_scale_fp >> REF_SCALE_SHIFT; |
| } |
| |
| static int unscaled_value(int val, const struct scale_factors_common *sfc) { |
| (void) sfc; |
| return val; |
| } |
| |
| static MV32 scaled_mv(const MV *mv, const struct scale_factors *scale) { |
| const MV32 res = { |
| scaled_y(mv->row, scale->sfc) + scale->y_offset_q4, |
| scaled_x(mv->col, scale->sfc) + scale->x_offset_q4 |
| }; |
| return res; |
| } |
| |
| static MV32 unscaled_mv(const MV *mv, const struct scale_factors *scale) { |
| const MV32 res = { |
| mv->row, |
| mv->col |
| }; |
| return res; |
| } |
| |
| static void set_offsets_with_scaling(struct scale_factors *scale, |
| int row, int col) { |
| scale->x_offset_q4 = scaled_x(col << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK; |
| scale->y_offset_q4 = scaled_y(row << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK; |
| } |
| |
| static void set_offsets_without_scaling(struct scale_factors *scale, |
| int row, int col) { |
| scale->x_offset_q4 = 0; |
| scale->y_offset_q4 = 0; |
| } |
| |
| static int get_fixed_point_scale_factor(int other_size, int this_size) { |
| // Calculate scaling factor once for each reference frame |
| // and use fixed point scaling factors in decoding and encoding routines. |
| // Hardware implementations can calculate scale factor in device driver |
| // and use multiplication and shifting on hardware instead of division. |
| return (other_size << REF_SCALE_SHIFT) / this_size; |
| } |
| |
| static int check_scale_factors(int other_w, int other_h, |
| int this_w, int this_h) { |
| return 2 * this_w >= other_w && |
| 2 * this_h >= other_h && |
| this_w <= 16 * other_w && |
| this_h <= 16 * other_h; |
| } |
| |
| void vp9_setup_scale_factors_for_frame(struct scale_factors *scale, |
| struct scale_factors_common *scale_comm, |
| int other_w, int other_h, |
| int this_w, int this_h) { |
| if (!check_scale_factors(other_w, other_h, this_w, this_h)) { |
| scale_comm->x_scale_fp = REF_INVALID_SCALE; |
| scale_comm->y_scale_fp = REF_INVALID_SCALE; |
| return; |
| } |
| |
| scale_comm->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w); |
| scale_comm->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h); |
| scale_comm->x_step_q4 = scaled_x(16, scale_comm); |
| scale_comm->y_step_q4 = scaled_y(16, scale_comm); |
| |
| if (vp9_is_scaled(scale_comm)) { |
| scale_comm->scale_value_x = scaled_x; |
| scale_comm->scale_value_y = scaled_y; |
| scale_comm->set_scaled_offsets = set_offsets_with_scaling; |
| scale_comm->scale_mv = scaled_mv; |
| } else { |
| scale_comm->scale_value_x = unscaled_value; |
| scale_comm->scale_value_y = unscaled_value; |
| scale_comm->set_scaled_offsets = set_offsets_without_scaling; |
| scale_comm->scale_mv = unscaled_mv; |
| } |
| |
| // 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 (scale_comm->x_step_q4 == 16) { |
| if (scale_comm->y_step_q4 == 16) { |
| // No scaling in either direction. |
| scale_comm->predict[0][0][0] = vp9_convolve_copy; |
| scale_comm->predict[0][0][1] = vp9_convolve_avg; |
| scale_comm->predict[0][1][0] = vp9_convolve8_vert; |
| scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert; |
| scale_comm->predict[1][0][0] = vp9_convolve8_horiz; |
| scale_comm->predict[1][0][1] = vp9_convolve8_avg_horiz; |
| } else { |
| // No scaling in x direction. Must always scale in the y direction. |
| scale_comm->predict[0][0][0] = vp9_convolve8_vert; |
| scale_comm->predict[0][0][1] = vp9_convolve8_avg_vert; |
| scale_comm->predict[0][1][0] = vp9_convolve8_vert; |
| scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert; |
| scale_comm->predict[1][0][0] = vp9_convolve8; |
| scale_comm->predict[1][0][1] = vp9_convolve8_avg; |
| } |
| } else { |
| if (scale_comm->y_step_q4 == 16) { |
| // No scaling in the y direction. Must always scale in the x direction. |
| scale_comm->predict[0][0][0] = vp9_convolve8_horiz; |
| scale_comm->predict[0][0][1] = vp9_convolve8_avg_horiz; |
| scale_comm->predict[0][1][0] = vp9_convolve8; |
| scale_comm->predict[0][1][1] = vp9_convolve8_avg; |
| scale_comm->predict[1][0][0] = vp9_convolve8_horiz; |
| scale_comm->predict[1][0][1] = vp9_convolve8_avg_horiz; |
| } else { |
| // Must always scale in both directions. |
| scale_comm->predict[0][0][0] = vp9_convolve8; |
| scale_comm->predict[0][0][1] = vp9_convolve8_avg; |
| scale_comm->predict[0][1][0] = vp9_convolve8; |
| scale_comm->predict[0][1][1] = vp9_convolve8_avg; |
| scale_comm->predict[1][0][0] = vp9_convolve8; |
| scale_comm->predict[1][0][1] = vp9_convolve8_avg; |
| } |
| } |
| // 2D subpel motion always gets filtered in both directions |
| scale_comm->predict[1][1][0] = vp9_convolve8; |
| scale_comm->predict[1][1][1] = vp9_convolve8_avg; |
| |
| scale->sfc = scale_comm; |
| scale->x_offset_q4 = 0; // calculated per block |
| scale->y_offset_q4 = 0; // calculated per block |
| } |