font cache test

examples/widgets/textarea/lv_example_textarea_1.c

@@ -18,14 +18,14 @@ static void btnm_event_handler(lv_obj_t * obj, lv_event_t event)
 void lv_example_textarea_1(void)
 {
     lv_obj_t * ta = lv_textarea_create(lv_scr_act(), NULL);
-    lv_textarea_set_one_line(ta, true);
+//    lv_textarea_set_one_line(ta, true);
     lv_obj_align(ta, NULL, LV_ALIGN_IN_TOP_MID, 0, 10);
     lv_obj_add_state(ta, LV_STATE_FOCUSED); /*To be sure the cursor is visible*/
 
     static const char * btnm_map[] = {"1", "2", "3", "\n",
                                "4", "5", "6", "\n",
                                "7", "8", "9", "\n",
-                               LV_SYMBOL_BACKSPACE, "0", LV_SYMBOL_NEW_LINE};
+                               LV_SYMBOL_BACKSPACE, "0", LV_SYMBOL_NEW_LINE, ""};
 
     lv_obj_t * btnm = lv_btnmatrix_create(lv_scr_act(), NULL);
     lv_obj_set_size(btnm, 200, 150);

src/lv_font/lv_font.h

@@ -69,7 +69,7 @@ typedef struct _lv_font_struct {
     int8_t underline_position;      /**< Distance between the top of the underline and base line (< 0 means below the base line)*/
     int8_t underline_thickness;     /**< Thickness of the underline*/
 
-    void * dsc;                     /**< Store implementation specific or run_time data or caching here*/
+    const void * dsc;                     /**< Store implementation specific or run_time data or caching here*/
 #if LV_USE_USER_DATA
     void * user_data;               /**< Custom user data for font. */
 #endif
@@ -137,7 +137,7 @@ LV_FONT_DECLARE(lv_font_montserrat_12)
 #endif
 
 #if LV_FONT_MONTSERRAT_14
-LV_FONT_DECLARE(lv_font_montserrat_14)
+LV_FONT_DECLARE(const lv_font_montserrat_14)
 #endif
 
 #if LV_FONT_MONTSERRAT_16

src/lv_font/lv_font_fmt_txt.c

@@ -207,7 +207,7 @@ static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter)
     lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
 
     /*Check the cache first*/
-    if(letter == fdsc->last_letter) return fdsc->last_glyph_id;
+    if(fdsc->cache && letter == fdsc->cache->last_letter) return fdsc->cache->last_glyph_id;
 
     uint16_t i;
     for(i = 0; i < fdsc->cmap_num; i++) {
@@ -246,13 +246,17 @@ static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter)
         }
 
         /*Update the cache*/
-        fdsc->last_letter = letter;
+        if(fdsc->cache) {
-        fdsc->last_glyph_id = glyph_id;
+            fdsc->cache->last_letter = letter;
+            fdsc->cache->last_glyph_id = glyph_id;
+        }
         return glyph_id;
     }
 
-    fdsc->last_letter = letter;
+    if(fdsc->cache) {
-    fdsc->last_glyph_id = 0;
+        fdsc->cache->last_letter = letter;
+        fdsc->cache->last_glyph_id = 0;
+    }
     return 0;
 
 }

src/lv_font/lv_font_fmt_txt.h

@@ -150,6 +150,11 @@ typedef enum {
     LV_FONT_FMT_TXT_COMPRESSED_NO_PREFILTER = 1,
 } lv_font_fmt_txt_bitmap_format_t;
 
+typedef struct {
+    uint32_t last_letter;
+    uint32_t last_glyph_id;
+}lv_font_fmt_txt_glyph_cache_t;
+
 /*Describe store additional data for fonts */
 typedef struct {
     /*The bitmaps of all glyphs*/
@@ -187,9 +192,7 @@ typedef struct {
     uint16_t bitmap_format  : 2;
 
     /*Cache the last letter and is glyph id*/
-    uint32_t last_letter;
+    lv_font_fmt_txt_glyph_cache_t * cache;
-    uint32_t last_glyph_id;
-
 } lv_font_fmt_txt_dsc_t;
 
 /**********************

src/lv_font/lv_font_montserrat_14.c

@@ -2107,8 +2107,10 @@ static const lv_font_fmt_txt_kern_classes_t kern_classes =
  *  ALL CUSTOM DATA
  *--------------------*/
 
+static  lv_font_fmt_txt_glyph_cache_t cache;
+
 /*Store all the custom data of the font*/
-static lv_font_fmt_txt_dsc_t font_dsc = {
+static const lv_font_fmt_txt_dsc_t font_dsc = {
     .glyph_bitmap = gylph_bitmap,
     .glyph_dsc = glyph_dsc,
     .cmaps = cmaps,
@@ -2117,7 +2119,8 @@ static lv_font_fmt_txt_dsc_t font_dsc = {
     .cmap_num = 2,
     .bpp = 4,
     .kern_classes = 1,
-    .bitmap_format = 0
+    .bitmap_format = 0,
+    .cache = &cache
 };
 
 /*-----------------
@@ -2125,7 +2128,7 @@ static lv_font_fmt_txt_dsc_t font_dsc = {
  *----------------*/
 
 /*Initialize a public general font descriptor*/
-lv_font_t lv_font_montserrat_14 = {
+const lv_font_t lv_font_montserrat_14 = {
     .get_glyph_dsc = lv_font_get_glyph_dsc_fmt_txt,    /*Function pointer to get glyph's data*/
     .get_glyph_bitmap = lv_font_get_bitmap_fmt_txt,    /*Function pointer to get glyph's bitmap*/
     .line_height = 16,          /*The maximum line height required by the font*/