//
// Created by sfd on 25-9-21.
//

#ifndef DXT_H
#define DXT_H
#include <cstdint>
#include <vector>

namespace PKG
{
    enum class DXTFlags
    {
        DXT1 = 1,
        DXT3 = 1 << 1,
        DXT5 = 1 << 2,
    };


    class DXT
    {
    public:
    // public static byte[] DecompressImage(int width, int height, byte[] data, DXTFlags flags)

        static void DecompressImage(int width, int height, std::vector<uint8_t>& data, DXTFlags flags);

    private:
        static void Decompress(std::vector<uint8_t>& rgba, std::vector<uint8_t>& block, int blockIndex, DXTFlags flags);

        static int UnPack565(std::vector<uint8_t>& block, int blockIndex, int packedOffset, std::vector<uint8_t>& color, int colorOffset);
        static void DecompressColor(std::vector<uint8_t>& rgba, std::vector<uint8_t>& block, int blockIndex, bool isDxt1);
        static void DecompressAlphaDxt3(std::vector<uint8_t>& rgba, std::vector<uint8_t>& block, int blockIndex);
        static void DecompressAlphaDxt5(std::vector<uint8_t>& rgba, std::vector<uint8_t>& block, int blockIndex);
    };
}


#endif //DXT_H