libcamera/rgbconvert.c

static void yuv_to_rgb16(unsigned char y, unsigned char u, unsigned char v, unsigned char *rgb)
{
    int r,g,b;
    int z;
    int rgb16;

    z = 0;

    r = 1.164 * (y - 16) + 1.596 * (v - 128);
    g = 1.164 * (y - 16) - 0.813 * (v - 128) - 0.391 * (u -128);
    b = 1.164 * (y - 16) + 2.018 * (u - 128);

    if (r > 255) r = 255;
    if (g > 255) g = 255;
    if (b > 255) b = 255;

    if (r < 0) r = 0;
    if (g < 0) g = 0;
    if (b < 0) b = 0;

    rgb16 = (int)(((r >> 3)<<11) | ((g >> 2) << 5)| ((b >> 3) << 0));

    *rgb = (unsigned char)(rgb16 & 0xFF);
    rgb++;
    *rgb = (unsigned char)((rgb16 & 0xFF00) >> 8);

}


void convertYUYVtoRGB565(unsigned char *buf, unsigned char *rgb, int width, int height)
{
    int x,y,z=0;
    int blocks;

    blocks = (width * height) * 2;

    for (y = 0; y < blocks; y+=4) {
        unsigned char Y1, Y2, U, V;

        Y1 = buf[y + 0];
        U = buf[y + 1];
        Y2 = buf[y + 2];
        V = buf[y + 3];

        yuv_to_rgb16(Y1, U, V, &rgb[y]);
        yuv_to_rgb16(Y2, U, V, &rgb[y + 2]);
    }

}