int __stdcall _HH_ReadPcxFromFile(HiHook* h, H3LoadedPCX* pcx, LPCSTR filename, int a3, int a4 ,int green_bits, int a6, int a7, int a8)
{
    PDWORD pal32 = PDWORD(PtrAt(&pcx->palette565.color[254]));

    const int r = THISCALL_8(int, h->GetDefaultFunc(), pcx, filename, a3, a4, green_bits, a6, a7, a8);

    const BOOL mode565 = green_bits == 6;

    for (int i = 0; i < 256; ++i)
    {
        if (mode565)
            pal32[i] = H3RGB565::Unpack(pcx->palette565.color[i].GetBits()) + 0xFF000000;
        else
            pal32[i] = H3RGB555::Unpack(pcx->palette565.color[i].GetBits()) + 0xFF000000;
    }

    PtrAt(&pcx->palette565.color[254]) = DWORD(pal32);

    return r;
}

...
if (h3_BitMode == 4) // only apply on 32-bit modes
    pi->WriteHiHook(0x44f710, SPLICE_, THISCALL_, _HH_ReadPcxFromFile);