LVGL G-code preview. Legacy MKS WiFi Cura plugin compatibility (#20589)

Marlin/src/core/macros.h

 #define ANY_BUTTON(V...)    DO(BTNEX,||,V)
 
 #define WITHIN(N,L,H)       ((N) >= (L) && (N) <= (H))
+#define ISEOL(C)            ((C) == '\n' || (C) == '\r')
 #define NUMERIC(a)          WITHIN(a, '0', '9')
 #define DECIMAL(a)          (NUMERIC(a) || a == '.')
 #define HEXCHR(a)           (NUMERIC(a) ? (a) - '0' : WITHIN(a, 'a', 'f') ? ((a) - 'a' + 10)  : WITHIN(a, 'A', 'F') ? ((a) - 'A' + 10) : -1)

Marlin/src/feature/e_parser.h

   FORCE_INLINE static void disable() { enabled = false; }
 
   FORCE_INLINE static void update(State &state, const uint8_t c) {
-    #define ISEOL(C) ((C) == '\n' || (C) == '\r')
     switch (state) {
       case EP_RESET:
         switch (c) {

Marlin/src/gcode/queue.cpp

   return true;
 }
 
-#define ISEOL(C) ((C) == '\n' || (C) == '\r')
-
 /**
  * Enqueue with Serial Echo
  * Return true if the command was consumed

Marlin/src/lcd/extui/lib/mks_ui/draw_print_file.cpp

       }
 
       uint16_t c = card.get();
-      // check if we have more data or finished the line (CR)
-      if (c == '\r') break;
+      // check for more data or end of line (CR or LF)
+      if (ISEOL(c)) {
+        c = card.get(); // more eol?
+        if (!ISEOL(c)) card.setIndex(card.getIndex() - 1);
+        break;
+      }
       card.setIndex(card.getIndex() - 1);
       k++;
       j = 0;
       ignore_start = false;
+      if (k > 1) {
+        card.closefile();
+        break;
+      }
     }
     #if HAS_TFT_LVGL_UI_SPI
       for (i = 0; i < 200;) {

Marlin/src/lcd/extui/lib/mks_ui/tft_lvgl_configuration.cpp

 }
 
 //sd
+extern uint8_t public_buf[512];
 char *cur_namefff;
-uint32_t sd_read_base_addr = 0,sd_read_addr_offset = 0;
+uint32_t sd_read_base_addr = 0, sd_read_addr_offset = 0, small_image_size = 409;
 lv_fs_res_t sd_open_cb (lv_fs_drv_t * drv, void * file_p, const char * path, lv_fs_mode_t mode) {
   //cur_namefff = strrchr(path, '/');
   char name_buf[100];
   sd_read_base_addr = lv_open_gcode_file((char *)name_buf);
   sd_read_addr_offset = sd_read_base_addr;
   if (sd_read_addr_offset == UINT32_MAX) return LV_FS_RES_NOT_EX;
+  // find small image size
+  card.read(public_buf, 512);
+  public_buf[511] = '\0';
+  char* eol = strpbrk((const char*)public_buf, "\n\r");
+  small_image_size = (uintptr_t)eol - (uintptr_t)((uint32_t *)(&public_buf[0])) + 1;
   return LV_FS_RES_OK;
 }
 
 }
 
 lv_fs_res_t sd_seek_cb(lv_fs_drv_t * drv, void * file_p, uint32_t pos) {
-  sd_read_addr_offset = sd_read_base_addr + (pos - 4) / 200 * 409;
+  sd_read_addr_offset = sd_read_base_addr + (pos - 4) / 200 * small_image_size;
   lv_gcode_file_seek(sd_read_addr_offset);
   return LV_FS_RES_OK;
 }
 
 lv_fs_res_t sd_tell_cb(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p) {
   if (sd_read_addr_offset) *pos_p = 0;
-  else *pos_p = (sd_read_addr_offset - sd_read_base_addr) / 409 * 200 + 4;
+  else *pos_p = (sd_read_addr_offset - sd_read_base_addr) / small_image_size * 200 + 4;
   return LV_FS_RES_OK;
 }