FAST_UNICODE_INDEX - faster binary search for index from unicode code point, for ordered by code point fonts only

Extensions/Smooth_font.cpp

@@ -338,6 +338,37 @@ uint32_t TFT_eSPI::readInt32(void)
 ** Function name:           getUnicodeIndex
 ** Description:             Get the font file index of a Unicode character
 *************************************************************************************x*/
+
+#ifdef FAST_UNICODE_INDEX
+bool TFT_eSPI::getUnicodeIndex(uint16_t unicode, uint16_t *index)
+{
+  int above = gFont.gCount;
+  int bottom = 0;
+  int i = above / 2;
+  do
+  {
+    uint16_t code = gUnicode[i];
+    if (code == unicode)
+    {
+      *index = i;
+      return true;
+    }
+    if (code > unicode)
+    {
+      above = i;
+    }
+    else
+    {
+      bottom = i+1;
+    }
+    i = (above+bottom)/2;
+  } while (above > bottom);
+
+  return false;
+}
+
+#else
+
 bool TFT_eSPI::getUnicodeIndex(uint16_t unicode, uint16_t *index)
 {
   for (uint16_t i = 0; i < gFont.gCount; i++)
@@ -351,6 +382,8 @@ bool TFT_eSPI::getUnicodeIndex(uint16_t unicode, uint16_t *index)
   return false;
 }
 
+#endif
+
 
 /***************************************************************************************
 ** Function name:           drawGlyph

User_Setup.h

@@ -304,6 +304,8 @@
 // this will save ~20kbytes of FLASH
 #define SMOOTH_FONT
 
+// Smooth font improvements
+#define FAST_UNICODE_INDEX
 
 // ##################################################################################
 //