diff options
Diffstat (limited to 'libavutil/spherical.c')
-rw-r--r-- | libavutil/spherical.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libavutil/spherical.c b/libavutil/spherical.c new file mode 100644 index 0000000000..0ca2dd367a --- /dev/null +++ b/libavutil/spherical.c @@ -0,0 +1,52 @@ +/* + * Copyright (c) 2016 Vittorio Giovara <vittorio.giovara@gmail.com> + * + * 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 "mem.h" +#include "spherical.h" + +AVSphericalMapping *av_spherical_alloc(size_t *size) +{ + AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping)); + if (!spherical) + return NULL; + + if (size) + *size = sizeof(*spherical); + + return spherical; +} + +void av_spherical_tile_bounds(AVSphericalMapping *map, + size_t width, size_t height, + size_t *left, size_t *top, + size_t *right, size_t *bottom) +{ + /* conversion from 0.32 coordinates to pixels */ + uint64_t orig_width = (uint64_t) width * UINT32_MAX / + (UINT32_MAX - map->bound_right - map->bound_left); + uint64_t orig_height = (uint64_t) height * UINT32_MAX / + (UINT32_MAX - map->bound_bottom - map->bound_top); + + /* add a (UINT32_MAX - 1) to round up integer division */ + *left = (orig_width * map->bound_left + UINT32_MAX - 1) / UINT32_MAX; + *top = (orig_height * map->bound_top + UINT32_MAX - 1) / UINT32_MAX; + *right = orig_width - width - *left; + *bottom = orig_height - height - *top; +} |