From 1b7ffddb3a999f37443c58232b112534c0abcf28 Mon Sep 17 00:00:00 2001 From: Vittorio Giovara Date: Fri, 10 Feb 2017 15:26:55 -0500 Subject: spherical: Add tiled equirectangular type and projection-specific properties Signed-off-by: Vittorio Giovara --- libavutil/spherical.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'libavutil/spherical.c') diff --git a/libavutil/spherical.c b/libavutil/spherical.c index 816452cbd6..0ca2dd367a 100644 --- a/libavutil/spherical.c +++ b/libavutil/spherical.c @@ -32,3 +32,21 @@ AVSphericalMapping *av_spherical_alloc(size_t *size) 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; +} -- cgit v1.2.3