refactor: remove some unused functions and prototypes

src/hal/lv_hal_disp.c

@@ -360,28 +360,6 @@ lv_disp_draw_buf_t * lv_disp_get_draw_buf(lv_disp_t * disp)
     return disp->driver->draw_buf;
 }
 
-/**
- * Get the number of areas in the buffer
- * @return number of invalid areas
- */
-uint16_t lv_disp_get_inv_buf_size(lv_disp_t * disp)
-{
-    return disp->inv_p;
-}
-
-/**
- * Pop (delete) the last 'num' invalidated areas from the buffer
- * @param num number of areas to delete
- */
-void _lv_disp_pop_from_inv_buf(lv_disp_t * disp, uint16_t num)
-{
-
-    if(disp->inv_p < num)
-        disp->inv_p = 0;
-    else
-        disp->inv_p -= num;
-}
-
 /**
  * Set the rotation of this display.
  * @param disp pointer to a display (NULL to use the default display)

src/hal/lv_hal_disp.h

@@ -313,25 +313,6 @@ lv_disp_t * lv_disp_get_next(lv_disp_t * disp);
  */
 lv_disp_draw_buf_t * lv_disp_get_draw_buf(lv_disp_t * disp);
 
-/**
- * Get the number of areas in the buffer
- * @return number of invalid areas
- */
-uint16_t lv_disp_get_inv_buf_size(lv_disp_t * disp);
-
-/**
- * Pop (delete) the last 'num' invalidated areas from the buffer
- * @param num number of areas to delete
- */
-void _lv_disp_pop_from_inv_buf(lv_disp_t * disp, uint16_t num);
-
-/**
- * Check the driver configuration if it's double buffered (both `buf1` and `buf2` are set)
- * @param disp pointer to to display to check
- * @return true: double buffered; false: not double buffered
- */
-bool lv_disp_is_double_buf(lv_disp_t * disp);
-
 /**********************
  *      MACROS
  **********************/