// Copyright (c) 2016-2018 Kiwano - Nomango
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <kiwano/core/Time.h>
#include <kiwano/render/Texture.h>

namespace kiwano
{
KGE_DECLARE_SMART_PTR(GifImage);

/**
 * \addtogroup Render
 * @{
 */

/**
 * \~chinese
 * @brief GIF图像
 */
class KGE_API GifImage : public virtual ObjectBase
{
public:
    /// \~chinese
    /// @brief 创建GIF图片
    static GifImagePtr Create(String const& file_path);

    /// \~chinese
    /// @brief 创建GIF图片
    static GifImagePtr Create(Resource const& res);

    GifImage();

    /// \~chinese
    /// @brief 加载本地GIF图片
    bool Load(String const& file_path);

    /// \~chinese
    /// @brief 加载GIF资源
    bool Load(Resource const& res);

    /// \~chinese
    /// @brief 是否有效
    bool IsValid() const;

    /// \~chinese
    /// @brief 获取像素宽度
    uint32_t GetWidthInPixels() const;

    /// \~chinese
    /// @brief 获取像素高度
    uint32_t GetHeightInPixels() const;

    /// \~chinese
    /// @brief 获取帧数量
    uint32_t GetFramesCount() const;

public:
    /// \~chinese
    /// @brief GIF帧的处置方式
    enum class DisposalType
    {
        Unknown,     ///< 未知
        None,        ///< 不处理
        Background,  ///< 背景
        Previous     ///< 恢复前一帧
    };

    /// \~chinese
    /// @brief GIF帧
    struct Frame
    {
        Duration     delay;          ///< 帧延迟
        TexturePtr   texture;        ///< 帧图像
        Rect         rect;           ///< 绘制区域
        DisposalType disposal_type;  ///< 处置方式

        Frame();
    };

    /// \~chinese
    /// @brief 获取GIF帧
    /// @param index 帧下标
    Frame GetFrame(uint32_t index);

private:
    bool GetGlobalMetadata();

private:
    uint32_t frames_count_;
    uint32_t width_in_pixels_;
    uint32_t height_in_pixels_;

#if KGE_RENDER_ENGINE == KGE_RENDER_ENGINE_DIRECTX
public:
    ComPtr<IWICBitmapDecoder> GetDecoder() const;

    void SetDecoder(ComPtr<IWICBitmapDecoder> decoder);

private:
    ComPtr<IWICBitmapDecoder> decoder_;
#endif
};

/** @} */

inline GifImage::Frame::Frame()
    : disposal_type(DisposalType::Unknown)
{
}

inline uint32_t GifImage::GetWidthInPixels() const
{
    return width_in_pixels_;
}

inline uint32_t GifImage::GetHeightInPixels() const
{
    return height_in_pixels_;
}

inline uint32_t GifImage::GetFramesCount() const
{
    return frames_count_;
}

inline bool GifImage::IsValid() const
{
#if KGE_RENDER_ENGINE == KGE_RENDER_ENGINE_DIRECTX
    return decoder_ != nullptr;
#else
    return false;  // not supported
#endif
}

#if KGE_RENDER_ENGINE == KGE_RENDER_ENGINE_DIRECTX
inline ComPtr<IWICBitmapDecoder> GifImage::GetDecoder() const
{
    return decoder_;
}

inline void GifImage::SetDecoder(ComPtr<IWICBitmapDecoder> decoder)
{
    decoder_ = decoder;
}
#endif

}  // namespace kiwano