1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12#include "segmentation.h"
13#include "vpx_mem/vpx_mem.h"
14
15void vp8_update_gf_useage_maps(VP8_COMP *cpi, VP8_COMMON *cm, MACROBLOCK *x)
16{
17    int mb_row, mb_col;
18
19    MODE_INFO *this_mb_mode_info = cm->mi;
20
21    x->gf_active_ptr = (signed char *)cpi->gf_active_flags;
22
23    if ((cm->frame_type == KEY_FRAME) || (cm->refresh_golden_frame))
24    {
25        // Reset Gf useage monitors
26        vpx_memset(cpi->gf_active_flags, 1, (cm->mb_rows * cm->mb_cols));
27        cpi->gf_active_count = cm->mb_rows * cm->mb_cols;
28    }
29    else
30    {
31        // for each macroblock row in image
32        for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
33        {
34            // for each macroblock col in image
35            for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
36            {
37
38                // If using golden then set GF active flag if not already set.
39                // If using last frame 0,0 mode then leave flag as it is
40                // else if using non 0,0 motion or intra modes then clear flag if it is currently set
41                if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) || (this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))
42                {
43                    if (*(x->gf_active_ptr) == 0)
44                    {
45                        *(x->gf_active_ptr) = 1;
46                        cpi->gf_active_count ++;
47                    }
48                }
49                else if ((this_mb_mode_info->mbmi.mode != ZEROMV) && *(x->gf_active_ptr))
50                {
51                    *(x->gf_active_ptr) = 0;
52                    cpi->gf_active_count--;
53                }
54
55                x->gf_active_ptr++;          // Step onto next entry
56                this_mb_mode_info++;           // skip to next mb
57
58            }
59
60            // this is to account for the border
61            this_mb_mode_info++;
62        }
63    }
64}
65