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53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/*
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* Copyright (c) 2016 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "mem.h"
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#include "spherical.h"
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AVSphericalMapping *av_spherical_alloc(size_t *size)
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{
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AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping));
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if (!spherical)
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return NULL;
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if (size)
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*size = sizeof(*spherical);
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return spherical;
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}
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void av_spherical_tile_bounds(AVSphericalMapping *map,
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size_t width, size_t height,
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size_t *left, size_t *top,
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size_t *right, size_t *bottom)
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{
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/* conversion from 0.32 coordinates to pixels */
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uint64_t orig_width = (uint64_t) width * UINT32_MAX /
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(UINT32_MAX - map->bound_right - map->bound_left);
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uint64_t orig_height = (uint64_t) height * UINT32_MAX /
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(UINT32_MAX - map->bound_bottom - map->bound_top);
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/* add a (UINT32_MAX - 1) to round up integer division */
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*left = (orig_width * map->bound_left + UINT32_MAX - 1) / UINT32_MAX;
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*top = (orig_height * map->bound_top + UINT32_MAX - 1) / UINT32_MAX;
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*right = orig_width - width - *left;
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*bottom = orig_height - height - *top;
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}
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