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