Function hqxInit

src/Engine/Scalers/init.cpp:25–38

uint32_t   YUV1, YUV2;

HQX_API void HQX_CALLCONV hqxInit(void)
{
    /* Initalize RGB to YUV lookup table */
    uint32_t c, r, g, b, y, u, v;
    for (c = 0; c < 16777215; c++) {
        r = (c & 0xFF0000) >> 16;
        g = (c & 0x00FF00) >> 8;
        b = c & 0x0000FF;
        y = (uint32_t)(0.299*r + 0.587*g + 0.114*b);
        u = (uint32_t)(-0.169*r - 0.331*g + 0.5*b) + 128;
        v = (uint32_t)(0.5*r - 0.419*g - 0.081*b) + 128;
        RGBtoYUV[c] = (y << 16) + (u << 8) + v;
    }
}