/* * 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" #define BBOX(type, name) \static int bbox_##name(FFBoundingBox *bbox, \ const type *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 type *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; \} BBOX(uint8_t, 8)BBOX(uint16_t, 16) int ff_calculate_bounding_box(FFBoundingBox *bbox, const uint8_t *data, int linesize, int w, int h, int min_val, int depth){ if (depth <= 8) return bbox_8(bbox, data, linesize, w, h, min_val); else return bbox_16(bbox, (const uint16_t *)data, linesize / 2, w, h, min_val);}