// DEV devices
#define DEV_PATH_STYLUS "/dev/input/stylus"
#define DEV_PATH_TOUCH  "/dev/input/touch"
#define DEV_PATH_FB     "/dev/fb0"

// Path definitions
#define US_HOME_PATH    "/mnt/us/extensions/simplenotes"
#define US_SAVE_PATH    "/mnt/us/simplenotes"

// Raw stylus ranges (from full calibration)
#define RAW_X_MIN  0
#define RAW_X_MAX  15624   // left ~15624, right ~0
#define RAW_Y_MIN  0
#define RAW_Y_MAX  20832   // top ~20832, bottom ~0


// Stroke thickness in pixels
#define STROKE_PX 3

// Height of the top/bottom gesture bar in pixels
#define TOPBAR_H 100

// Refresh interval in ms
#define REFRESH_INTERVAL_MS 45

// Double-tap window and feedback delay
#define DOUBLE_TAP_WINDOW_SEC     2
#define SAVE_FEEDBACK_SLEEP_SEC   1


// Tiny 5x7 bitmap font
#define TITLE_FONT_W 5
#define TITLE_FONT_H 7
#define TITLE_FONT_ADVANCE 6   // 5px glyph + 1px space

// ============================================================================
// Framebuffer context
// ============================================================================

typedef struct {
    int fd;
    struct fb_fix_screeninfo finfo;
    struct fb_var_screeninfo vinfo;
    uint8_t *fbp;
    size_t screensize;
} fb_ctx_t;

// ============================================================================
// Global drawing / state
// ============================================================================

static uint8_t *g_bitmap = NULL;   // 1-bit (stored as bytes) full-screen: 1=black, 0=white
static int g_fb_width = 0;
static int g_fb_height = 0;

typedef enum {
    TAP_NONE = 0,
    TAP_LEFT,
    TAP_RIGHT,
    TAP_BOTTOM_RIGHT
} tap_zone_t;

static tap_zone_t g_last_tap_zone = TAP_NONE;
static int g_tap_count = 0;
static time_t g_last_tap_timestamp = 0;