Sws.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte-Multimedia.
 *
 * StormByte-Multimedia original source is dual-licensed:
 *
 * 1. GNU Lesser General Public License v3.0 (or later)
 *    You may redistribute and/or modify this file under the terms of the
 *    GNU Lesser General Public License as published by the Free Software
 *    Foundation, either version 3 of the License, or (at your option)
 *    any later version.
 *
 * 2. Commercial license
 *    Alternatively, this file may be used under the terms of a commercial
 *    license agreement with the copyright holder
 *    (David C. Manuelda <StormByte@gmail.com>).
 *
 * Both licenses apply only to original StormByte-Multimedia source in this
 * file. Third-party components — including FFmpeg and embedded trained data —
 * remain under their own licenses and are not covered by the commercial grant.
 *
 * Neither license grants any patent rights. Any patent licenses required
 * to use this software or third-party components must be obtained separately
 * from the patent holders.
 *
 * StormByte-Multimedia 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
 * version 3 along with StormByte-Multimedia. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-StormByte-Commercial
 */
 
#pragma once
 
#include <StormByte/multimedia/ffmpeg/AVPointer.hxx>
#include <StormByte/multimedia/ffmpeg/fwd.hxx>
#include <StormByte/multimedia/visibility.h>

namespace StormByte::Multimedia::FFmpeg {
    class AVFrame;

    class STORMBYTE_MULTIMEDIA_PUBLIC Sws: public AVPointer<::SwsContext> {
        friend class AVFrame;
 
        public:
            Sws(Sws&& other) noexcept = default;

            ~Sws() noexcept override;

            Sws& operator=(Sws&& other) noexcept = default;

            explicit operator bool() const noexcept;

            static int Bilinear() noexcept;

            static int Bicubic() noexcept;

            static int FastBilinear() noexcept;

            static int Point() noexcept;

            static int Lanczos() noexcept;

            static Sws Open(int src_w, int src_h, int src_fmt,
                int dst_w, int dst_h, int dst_fmt, int flags = 0) noexcept;

            bool Ensure(int src_w, int src_h, int src_fmt,
                int dst_w, int dst_h, int dst_fmt, int flags = 0) noexcept;

            bool Scale(const AVFrame& src, AVFrame& dst) const noexcept;
 
        private:
            explicit Sws(::SwsContext* ctx) noexcept;

            Sws() noexcept;

            void Free() noexcept override;
 
            using AVPointer<::SwsContext>::Get;
 
            int m_srcW = 0;     
            int m_srcH = 0;     
            int m_srcFmt = 0;   
            int m_dstW = 0;     
            int m_dstH = 0;     
            int m_dstFmt = 0;   
            int m_flags = 0;    
    };
 
    extern template class STORMBYTE_MULTIMEDIA_PUBLIC AVPointer<::SwsContext>;
}