fix(tiny_ttf): fix GPOS lookup list table address (#8251)

scripts/font_license_verify.py

@@ -13,7 +13,9 @@ except ImportError:
 
 # Fonts that are excluded from the license check
 # Only add fonts that are known to be public domain or have a compatible license
-_EXCLUDED_FONTS = {}
+_EXCLUDED_FONTS = {
+    "OpenTypeTest GPOS One",
+}
 
 # Font name mapping to remove any style suffix
 _FONT_NAME_MAP = {
@@ -27,10 +29,13 @@ _FONT_NAME_MAP = {
 def get_font_full_name(font_path: str) -> str:
     font = TTFont(font_path)
     name_records = font["name"].names
+    fallback = None
     for record in name_records:
+        if record.nameID == 1:  # ID 1 corresponds to the font family name and will be used if full name doesn't exists
+            fallback = record.toStr()
         if record.nameID == 4:  # ID 4 corresponds to the full font name
             return record.toStr()
-    return None
+    return fallback
 
 
 def list_intree_fonts(path: str) -> List[Tuple[str, str]]:

src/libs/tiny_ttf/stb_truetype_htcw.h

@@ -2758,7 +2758,7 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo * info, i
     if(ttUSHORT(data, 2 + info->gpos) != 0) return 0;  // Minor version 0
 
     lookupListOffset = ttUSHORT(data, 8 + info->gpos);
-    lookupList = lookupListOffset;
+    lookupList = info->gpos + lookupListOffset;
     lookupCount = ttUSHORT(data, lookupList);
 
     for(i = 0; i < lookupCount; ++i) {
@@ -2876,7 +2876,7 @@ STBTT_DEF int stbtt_KernTableCheck(const stbtt_fontinfo * info)
         if(ttUSHORT(data, 2 + info->gpos) != 0) return 0;  // Minor version 0
 
         lookupListOffset = ttUSHORT(data, 8 + info->gpos);
-        lookupList = lookupListOffset;
+        lookupList = info->gpos + lookupListOffset;
         lookupCount = ttUSHORT(data, lookupList);
 
         for(i = 0; i < lookupCount; ++i) {

tests/src/test_cases/libs/test_tiny_ttf.c

@@ -82,4 +82,36 @@ void test_tiny_ttf_kerning(void)
 #endif
 }
 
+void test_tiny_ttf_gpos(void)
+{
+#if LV_USE_TINY_TTF && LV_TINY_TTF_FILE_SUPPORT
+    lv_font_t * font_normal = lv_tiny_ttf_create_file("A:src/test_assets/test_gpos_one.ttf", 60);
+    lv_font_t * font_none = lv_tiny_ttf_create_file("A:src/test_assets/test_gpos_one.ttf", 60);
+    lv_font_set_kerning(font_none, LV_FONT_KERNING_NONE);
+
+    lv_obj_t * label_normal = lv_label_create(lv_screen_active());
+    lv_label_set_long_mode(label_normal, LV_LABEL_LONG_WRAP);
+    lv_label_set_text(label_normal, "ĄJ Ąg Ąģ Ąj Ąȷ Qȷ ąj ąȷ gȷ ģȷ ıȷ ųȷ vȷ Va Vá Vą Vf Vfl V.");
+    lv_obj_set_style_text_font(label_normal, font_normal, LV_PART_MAIN);
+    lv_obj_set_width(label_normal, 700);
+    lv_obj_set_style_text_align(label_normal, LV_TEXT_ALIGN_CENTER, 0);
+    lv_obj_align(label_normal, LV_ALIGN_CENTER, 0, -100);
+
+    lv_obj_t * label_none = lv_label_create(lv_screen_active());
+    lv_label_set_long_mode(label_normal, LV_LABEL_LONG_WRAP);
+    lv_label_set_text(label_none, "ĄJ Ąg Ąģ Ąj Ąȷ Qȷ ąj ąȷ gȷ ģȷ ıȷ ųȷ vȷ Va Vá Vą Vf Vfl V.");
+    lv_obj_set_style_text_font(label_none, font_none, LV_PART_MAIN);
+    lv_obj_set_width(label_none, 700);
+    lv_obj_set_style_text_align(label_none, LV_TEXT_ALIGN_CENTER, 0);
+    lv_obj_align(label_none, LV_ALIGN_CENTER, 0, 100);
+
+    TEST_ASSERT_EQUAL_SCREENSHOT("libs/tiny_ttf_3.png");
+
+    lv_tiny_ttf_destroy(font_normal);
+    lv_tiny_ttf_destroy(font_none);
+#else
+    TEST_IGNORE_MESSAGE("Ignoring test_tiny_ttf_gpos as it requires LV_USE_TINY_TTF && LV_TINY_TTF_FILE_SUPPORT");
+#endif
+}
+
 #endif