/* * 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 "avstring.h"#include "macros.h"#include "mem.h"#include "spherical.h" AVSphericalMapping *av_spherical_alloc(size_t *size){    AVSphericalMapping *spherical = av_mallocz(sizeof(AVSphericalMapping));    if (!spherical)        return NULL;     spherical->projection = AV_SPHERICAL_RECTILINEAR;     if (size)        *size = sizeof(*spherical);     return spherical;} void av_spherical_tile_bounds(const 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;} static const char *const spherical_projection_names[] = {    [AV_SPHERICAL_EQUIRECTANGULAR]      = "equirectangular",    [AV_SPHERICAL_CUBEMAP]              = "cubemap",    [AV_SPHERICAL_EQUIRECTANGULAR_TILE] = "tiled equirectangular",    [AV_SPHERICAL_HALF_EQUIRECTANGULAR] = "half equirectangular",    [AV_SPHERICAL_RECTILINEAR]          = "rectilinear",    [AV_SPHERICAL_FISHEYE]              = "fisheye",}; const char *av_spherical_projection_name(enum AVSphericalProjection projection){    if ((unsigned)projection >= FF_ARRAY_ELEMS(spherical_projection_names))        return "unknown";     return spherical_projection_names[projection];} int av_spherical_from_name(const char *name){    int i;     for (i = 0; i < FF_ARRAY_ELEMS(spherical_projection_names); i++) {        if (av_strstart(name, spherical_projection_names[i], NULL))            return i;    }     return -1;}