--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/esp/update_lcd_block.h	Sun Mar 10 15:03:53 2024 -0700
@@ -0,0 +1,51 @@
+#include <string>
+
+#include "esphome.h"
+#include "esphome/components/ili9xxx/ili9xxx_display.h"
+void update_lcd_block(esphome::ili9xxx::ILI9XXXDisplay *lcd, std::string &x) {
+  id(lcd).update();
+
+#if 1
+          std::string localPayload = x;
+          const char *buf = localPayload.data();
+#else
+  const char *buf = x.data();
+#endif
+  uint16_t seq, xp, yp, w, h;
+#define readu16()                          \
+  (static_cast<const uint16_t>(*(buf++)) | \
+   (static_cast<const uint16_t>(*(buf++)) << 8))
+  seq = readu16();
+  xp = readu16();
+  yp = readu16();
+  w = readu16();
+  h = readu16();
+  char seqDia[] = "           ";
+  seqDia[seq % 10] = '%';
+  ESP_LOGD("dbg",
+           "seq=%hu%s xp=%hu, yp=%hu, w=%hu, h=%hu, full payload=%d bytes", seq,
+           seqDia, xp, yp, w, h, x.size());
+#if 1
+  ///// v1
+  id(lcd).draw_pixels_at(320+w-1-xp, yp, w, h,
+                         reinterpret_cast<const uint8_t*>(buf),
+                         COLOR_ORDER_BGR,
+                         COLOR_BITNESS_888,
+                         /*big_endian=*/false,
+                         /*x_offset=*/0,
+                         /*y_offset=*/0,
+                         /*x_pad=*/0);
+#elif 0
+  ///// v2
+  for (uint16_t y = 0; y < h; y++) {
+    uint16_t row = yp + y;
+    for (uint16_t x = 0; x < w; x++) {
+      id(lcd).draw_pixel_at(320-1-(xp + w-1 - x), row, Color(*buf++, *buf++, *buf++));
+    }
+    // App.feed_wdt();
+  }
+  #else
+
+#endif
+  id(lcd).update();
+}
\ No newline at end of file