MeshCore-Solo/examples/companion_radio/ui-lvgl/Splash.h

// Boot splash -- included into UITask.cpp only.
//
// The MeshCore wordmark (ui-new's 128x13 bitmap, drawn 2x in amber), "solo",
// the Solo and upstream versions and the build date -- all in the wordmark's
// lettering (its own letters, plus l, v, d, digits, '.', '-' drawn to match;
// a line with anything else falls back to Noto) -- with three dots rising
// in turn while the rest of the device starts. Covers the whole display
// (status bar too) from lv_layer_top, fades out after SPLASH_MS; a tap skips
// it. Home -- and the PIN lock, if set -- are already built underneath.

#include "../ui-core/Lettering.h"

namespace splash {
static const uint32_t SPLASH_MS = 2500;
using namespace lettering;   // ../ui-core/Lettering.h: wordmark, letters, version/date
static const int LOGO_SCALE = 2;

static lv_obj_t*      s_root = nullptr;
static const int      MAX_IMGS = 6;
static uint32_t*      s_px[MAX_IMGS];     // ARGB8888 pixels of each drawn line
static lv_image_dsc_t s_img[MAX_IMGS];
static int            s_imgs = 0;
static lv_timer_t*    s_timer = nullptr;

static void freeAll(lv_anim_t* a) {
  (void)a;
  if (s_root) lv_obj_delete(s_root);
  s_root = nullptr;
  for (int i = 0; i < s_imgs; i++) lv_free(s_px[i]);
  s_imgs = 0;
}

static void dismiss() {
  if (s_timer) { lv_timer_delete(s_timer); s_timer = nullptr; }
  if (!s_root) return;
  lv_obj_remove_flag(s_root, LV_OBJ_FLAG_CLICKABLE);
  lv_anim_delete(s_root, NULL);
  anim::run(s_root, anim::setOpa, LV_OPA_COVER, LV_OPA_TRANSP, 300, freeAll);
}
static void onTimer(lv_timer_t* t) { (void)t; dismiss(); }
static bool up() { return s_root != nullptr; }   // until its fade-out has finished
static void onTap(lv_event_t* e) { (void)e; dismiss(); }

// A line in the lettering, `scale` x, in `col`: an image, or a Noto label when
// the text has a character the lettering lacks. `text` null = the wordmark.
static lv_obj_t* letters(lv_obj_t* parent, const char* text, int scale, int gap, uint32_t col, const lv_font_t* fallback) {
  int w = text ? textW(text, gap) : LOGO_W;
  if (w <= 0 || s_imgs >= MAX_IMGS) return label(parent, text ? text : "MeshCore", fallback, col);
  const int W = w * scale, H = LOGO_H * scale;
  uint32_t* px = (uint32_t*)lv_malloc((size_t)W * H * 4);
  if (!px) return label(parent, text ? text : "MeshCore", fallback, col);
  memset(px, 0, (size_t)W * H * 4);
  uint32_t on = 0xFF000000u | (col & 0xFFFFFFu);
  auto plot = [&](int x, int y) {
    for (int dy = 0; dy < scale; dy++)
      for (int dx = 0; dx < scale; dx++) px[(y * scale + dy) * W + x * scale + dx] = on;
  };
  if (!text) {
    for (int y = 0; y < LOGO_H; y++)
      for (int x = 0; x < LOGO_W; x++)
        if (logoBit(x, y)) plot(x, y);
  } else {
    int ox = 0;
    for (const char* p = text; *p; p++) {
      char c = (char)tolower((unsigned char)*p);
      int cw = charW(c);
      for (int y = 0; y < LOGO_H; y++)
        for (int x = 0; x < cw; x++)
          if (inked(c, x, y)) plot(ox + x, y);
      ox += cw + gap;
    }
  }
  lv_image_dsc_t& d = s_img[s_imgs];
  s_px[s_imgs++] = px;
  memset(&d, 0, sizeof(d));
  d.header.magic = LV_IMAGE_HEADER_MAGIC;
  d.header.cf = LV_COLOR_FORMAT_ARGB8888;
  d.header.w = W;
  d.header.h = H;
  d.header.stride = W * 4;
  d.data_size = (uint32_t)W * H * 4;
  d.data = (const uint8_t*)px;
  lv_obj_t* img = lv_image_create(parent);
  lv_image_set_src(img, &d);
  return img;
}

// One of the loading dots: rises 6 px and back, each a beat after the last.
static void dotY(void* o, int32_t v) { lv_obj_set_style_translate_y((lv_obj_t*)o, v, 0); }
static void wave(lv_obj_t* dot, int i) {
  lv_anim_t a;
  lv_anim_init(&a);
  lv_anim_set_var(&a, dot);
  lv_anim_set_exec_cb(&a, dotY);
  lv_anim_set_values(&a, 0, -6);
  lv_anim_set_duration(&a, 260);
  lv_anim_set_playback_duration(&a, 260);
  lv_anim_set_repeat_count(&a, LV_ANIM_REPEAT_INFINITE);
  lv_anim_set_repeat_delay(&a, 420);
  lv_anim_set_delay(&a, 140 * i);
  lv_anim_set_path_cb(&a, lv_anim_path_ease_in_out);
  lv_anim_start(&a);
}

}  // namespace splash

void UITask::showSplash() {
  using namespace splash;
  if (s_root) return;
  s_root = lv_obj_create(lv_layer_top());
  lv_obj_remove_style_all(s_root);
  lv_obj_set_size(s_root, LV_PCT(100), LV_PCT(100));
  lv_obj_set_style_bg_color(s_root, lv_color_hex(theme::BG), 0);
  lv_obj_set_style_bg_opa(s_root, LV_OPA_COVER, 0);
  lv_obj_add_flag(s_root, LV_OBJ_FLAG_CLICKABLE);
  lv_obj_add_event_cb(s_root, onTap, LV_EVENT_CLICKED, NULL);

  lv_obj_t* logo = letters(s_root, nullptr, LOGO_SCALE, 0, theme::ACCENT, THEME_FONT_LARGE);
  lv_obj_align(logo, LV_ALIGN_CENTER, 0, -50);
  anim::rise(logo, 10, 400);
  lv_obj_t* solo = letters(s_root, "solo", LOGO_SCALE, 3, theme::TEXT, THEME_FONT_LARGE);
  lv_obj_align(solo, LV_ALIGN_CENTER, 0, -14);

  // Ours, then upstream's, then the build date.
  char ver[24], line[48], date[24];
  soloVersion(ver, sizeof(ver));
  lv_obj_t* v = letters(s_root, ver[0] ? ver : "dev", 1, 2, theme::ACCENT, THEME_FONT_BODY);
  lv_obj_align(v, LV_ALIGN_CENTER, 0, 18);
  int y = 38;
#ifdef MESHCORE_VERSION
  snprintf(line, sizeof(line), "meshcore %s", MESHCORE_VERSION);
  lv_obj_align(letters(s_root, line, 1, 2, theme::TEXT_MUTED, THEME_FONT_SMALL), LV_ALIGN_CENTER, 0, y);
  y += 20;
#endif
  buildDate(date, sizeof(date));
  lv_obj_align(letters(s_root, date, 1, 2, theme::TEXT_MUTED, THEME_FONT_SMALL), LV_ALIGN_CENTER, 0, y);

  lv_obj_t* dots = lv_obj_create(s_root);
  lv_obj_remove_style_all(dots);
  lv_obj_set_size(dots, 60, 20);
  lv_obj_align(dots, LV_ALIGN_BOTTOM_MID, 0, -18);
  for (int i = 0; i < 3; i++) {
    lv_obj_t* d = lv_obj_create(dots);
    lv_obj_remove_style_all(d);
    lv_obj_set_size(d, 7, 7);
    lv_obj_set_style_radius(d, LV_RADIUS_CIRCLE, 0);
    lv_obj_set_style_bg_opa(d, LV_OPA_COVER, 0);
    lv_obj_set_style_bg_color(d, lv_color_hex(theme::ACCENT), 0);
    lv_obj_align(d, LV_ALIGN_BOTTOM_MID, (i - 1) * 16, -2);
    wave(d, i);
  }
  s_timer = lv_timer_create(onTimer, SPLASH_MS, NULL);   // deleted by dismiss()
}