/* * Copyright (c) 2005 Robert Edele <yartrebo@earthlink.net> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "bbox.h" int ff_calculate_bounding_box(FFBoundingBox *bbox,                              const uint8_t *data, int linesize, int w, int h,                              int min_val){    int x, y;    int start_x;    int start_y;    int end_x;    int end_y;    const uint8_t *line;     /* left bound */    for (start_x = 0; start_x < w; start_x++)        for (y = 0; y < h; y++)            if ((data[y * linesize + start_x] > min_val))                goto outl;outl:    if (start_x == w) /* no points found */        return 0;     /* right bound */    for (end_x = w - 1; end_x >= start_x; end_x--)        for (y = 0; y < h; y++)            if ((data[y * linesize + end_x] > min_val))                goto outr;outr:     /* top bound */    line = data;    for (start_y = 0; start_y < h; start_y++) {        for (x = 0; x < w; x++)            if (line[x] > min_val)                goto outt;        line += linesize;    }outt:     /* bottom bound */    line = data + (h-1)*linesize;    for (end_y = h - 1; end_y >= start_y; end_y--) {        for (x = 0; x < w; x++)            if (line[x] > min_val)                goto outb;        line -= linesize;    }outb:     bbox->x1 = start_x;    bbox->y1 = start_y;    bbox->x2 = end_x;    bbox->y2 = end_y;    return 1;}