added missed cache invalidate operations

Author: zwang-ambiq

src/draw/ambiq/lv_ambiq_ttf.c

@@ -7,6 +7,7 @@
  *      INCLUDES
  *********************/
 #include "../../lvgl.h"
+#include "src/draw/lv_draw_buf.h"
 #include "src/misc/lv_assert.h"
 #include "src/misc/lv_log.h"
 
@@ -397,6 +398,8 @@ static bool bitmap_cache_create_cb(bitmap_cache_node_t * node, void * user_data)
         LV_LOG_ERROR("Glyph bitmap allocation failed!");
         return false;
     }
+
+    lv_draw_buf_invalidate_cache(bitmap_buffer, NULL);
     AM_DEBUG_PIN_SET(DEBUG_PIN_5);
     lv_ambiq_vector_path_to_bitmap(path, bitmap_width, bitmap_height, bitmap_buffer->data, ctx->dsc->scale);
     AM_DEBUG_PIN_CLEAR(DEBUG_PIN_5);

src/draw/ambiq/lv_draw_ambiq_box_shadow.c

@@ -141,11 +141,14 @@ void lv_draw_ambiq_box_shadow(lv_draw_task_t * t, const lv_draw_box_shadow_dsc_t
     /*Get how many pixels are affected by the blur on the corners*/
     int32_t corner_size = dsc->width  + r_sh;
 
-    lv_draw_buf_t * sh_buf = lv_draw_buf_create_ex(&(LV_GLOBAL_DEFAULT()->font_draw_buf_handlers), corner_size,
+    lv_draw_buf_t * sh_buf = lv_draw_buf_create_ex(&(LV_GLOBAL_DEFAULT()->image_cache_draw_buf_handlers), corner_size,
                                                    corner_size,
                                                    LV_COLOR_FORMAT_L8, corner_size);
 
     LV_ASSERT_MALLOC(sh_buf);
+
+    lv_draw_buf_invalidate_cache(sh_buf, NULL);
+
     shadow_draw_corner_buf(&core_area, sh_buf, dsc->width, r_sh);
 
     /*Skip a lot of masking if the background will cover the shadow that would be masked out*/