Function bodies 55 total

static void handle_signal(int sig) {
    (void)sig;
    g_running = false;
}

static inline uint16_t xrgb8888_to_rgb565(uint8_t r, uint8_t g, uint8_t b) {
    return (uint16_t)(((r & 0xF8u) << 8) | ((g & 0xFCu) << 3) | (b >> 3));
}

static void scale_region_to_screen(
        const uint8_t* src,
        int src_x, int src_y,
        int src_w, int src_h,
        int src_stride, int src_bpp,
        uint16_t* dst)
{
    for (int dy = 0; dy < MK3_SCREEN_H; dy++) {
        int sy = src_y + (dy * src_h) / MK3_SCREEN_H;
        const uint8_t* src_row = src + (size_t)sy * src_stride;

        for (int dx = 0; dx < MK3_SCREEN_W; dx++) {
            int sx = src_x + (dx * src_w) / MK3_SCREEN_W;
            const uint8_t* px = src_row + (size_t)sx * src_bpp;

            uint8_t r, g, b;
            if (src_bpp == 4) {
                /* XRGB8888 little-endian: [B, G, R, X] */
                b = px[0];
                g = px[1];
                r = px[2];
            } else if (src_bpp == 3) {
                /* Packed BGR or RGB — assume BGR for DRM/LinuxFB default */
                b = px[0];
                g = px[1];
                r = px[2];
            } else if (src_bpp == 2) {
                /* Already RGB565 —

static void print_usage(const char* prog) {
    fprintf(stderr,
        "Usage: %s [OPTIONS]\n"
        "\n"
        "Mirror the framebuffer to the two MK3 480x272 screens.\n"
        "\n"
        "Options:\n"
        "  --resolution WxH   Source framebuffer resolution to capture\n"
        "                     (default: %dx%d)\n"
        "  --fps N            Target frame rate (default: %d)\n"
        "  --no-partial       Disable partial display rendering (default)\n"
        "  --partial          Enable partial display rendering\n"
        "  --help             Show this message\n",
        prog, DEFAULT_SRC_W, DEFAULT_SRC_H, DEFAULT_FPS);
}

int main(int argc, char* argv[]) {
    int src_w       = DEFAULT_SRC_W;
    int src_h       = DEFAULT_SRC_H;
    int fps         = DEFAULT_FPS;
    bool no_partial = true;  /* partial rendering disabled by default */

    /* ── Argument parsing ────────────────────────────────────────────── */
    for (int i = 1; i < argc; i++) {
        if (strcmp(argv[i], "--help") == 0) {
            print_usage(argv[0]);
            return 0;
        } else if (strcmp(argv[i], "--resolution") == 0) {
            if (i + 1 >= argc) {
                fprintf(stderr, "error: --resolution requires WxH argument\n");
                return 1;
            }
            i++;
            if (sscanf(argv[i], "%dx%d", &src_w, &src_h) != 2) {
                fprintf(stderr, "error: invalid resolution '%s' (expected WxH)\n", argv[i]);
                return 1;
            }
        } else if (strcmp(argv[i], "--fps") == 0) {
            if (i + 1 >= argc) {
                fprintf(stderr, "error: --fps require