update todo and wish list

README.md

@@ -20,7 +20,7 @@ Most tiny displays in hobbyist electronics world support 8-bit SPI, but some req
 
 Larger displays most likely do not support standalone SPI since it is not fast enough to refresh the full screen details. Most of them support 8-bit/16-bit Parallel interface.
 
-Some larger display require 3-bit SPI + RGB combo interface, i.e. require more than 3 + 24 pins. Most dev board do not have enough GPIO to support this. Arduino_GFX will eventually support this combo interface but will be in very low priority. A huge monthly donation may make it happen :P
+Some larger display require 3-bit SPI + RGB combo interface, i.e. require more than 3 + 24 pins. Most dev board do not have enough GPIO to support this. Arduino_GFX will eventually support this combo interface but will be in very low priority. A huge monthly sponsor may make it happen :P
 
 ## Ease of use
 #### Simple Declaration
@@ -84,8 +84,9 @@ Below are some figures compare with other 3 Arduino common display libraries.
 - 8-bit parallel interface (AVRPAR8, ESP32PAR8, ESP32S2PAR8, RPiPicoPAR8, RTLPAR8)
 - 16-bit parallel interface (ESP32PAR16, ESP32S2PAR8, RPiPicoPAR16)
 
-## Tobe Support data bus (Donation can make it happen)
+## Tobe Support data bus (Sponsors can make it happen)
 - ESP32 I2S 8-bit/16-bit parallel interface
+- Arduino ATMega2560 dual 8-bit Port form 16-bit parallel interface
 - FastLED
 
 ## Currently Supported Dev Board
@@ -103,7 +104,7 @@ Below are some figures compare with other 3 Arduino common display libraries.
 - Sony Spresense
 - WeAct BlackPill V2.0 (BlackPill F411CE)
 
-## Tobe Support Dev Board (Donation can make it happen)
+## Tobe Support Dev Board (Sponsors can make it happen)
 - Arduino ATMega2560
 - ESP32-S3 Series
 
@@ -155,7 +156,7 @@ Below are some figures compare with other 3 Arduino common display libraries.
 - ST7789 240x320 [[demo video](https://youtu.be/ZEvc1LkuVuQ)]
 - ST7796 320x480 [[demo video](https://youtu.be/hUL-RuG4MAQ)]
 
-## Tobe Support Display (Donation can make it happen)
+## Tobe Support Display (Sponsors can make it happen)
 - FastLED Martix supported by co-operate with Canvas
 - Mono display supported by co-operate with Canvas
 - Multi-color e-ink display supported by co-operate with Canvas
@@ -166,6 +167,12 @@ Below are some figures compare with other 3 Arduino common display libraries.
 - Canvas_3bit (1/4 memory space framebuffer)
 - Canvas_Mono (1/16 memory space framebuffer)
 
+## Feature wishlist (Sponsors can make it happen)
+- Print UTF8 Characters
+- Print color Emoji Characters
+- Load bitmap font files from flash / SD
+- Fill Gradient
+
 ## Using source code come from:
 - http://elm-chan.org/fsw/tjpgd/00index.html
 - https://github.com/adafruit/Adafruit-GFX-Library.git

src/Arduino_GFX.cpp

@@ -1832,6 +1832,14 @@ void Arduino_GFX::drawChar(int16_t x, int16_t y, unsigned char c,
   }
   else // 'Classic' built-in font
 #endif // !defined(ATTINY_CORE)
+#if defined(U8G2_FONT_SUPPORT)
+      if (u8g2Font)
+  {
+    u8x8_get_glyph_data(u8x8, encoding, buf, tile);
+    u8x8_DrawTile(u8x8, xx, y, 1, buf);
+  }
+  else // not u8g2Font
+#endif // defined(U8G2_FONT_SUPPORT)
   {
     block_w = 6 * textsize_x;
     block_h = 8 * textsize_y;
@@ -2038,6 +2046,9 @@ void Arduino_GFX::setRotation(uint8_t r)
 void Arduino_GFX::setFont(const GFXfont *f)
 {
   gfxFont = (GFXfont *)f;
+#if defined(U8G2_FONT_SUPPORT)
+  u8g2Font = NULL;
+#endif // defined(U8G2_FONT_SUPPORT)
 }
 
 /**************************************************************************/
@@ -2050,6 +2061,14 @@ void Arduino_GFX::flush()
 }
 #endif // !defined(ATTINY_CORE)
 
+#if defined(U8G2_FONT_SUPPORT)
+void Arduino_GFX::setFont(const uint8_t *font)
+{
+  gfxFont = NULL;
+  u8g2Font = (uint8_t *)font;
+}
+#endif // defined(U8G2_FONT_SUPPORT)
+
 /**************************************************************************/
 /*!
   @brief  Helper to determine size of a character with current font/size.
@@ -2119,6 +2138,12 @@ void Arduino_GFX::charBounds(char c, int16_t *x, int16_t *y,
   }
   else // not gfxFont
 #endif // !defined(ATTINY_CORE)
+#if defined(U8G2_FONT_SUPPORT)
+      if (u8g2Font)
+  {
+  }
+  else // not u8g2Font
+#endif // defined(U8G2_FONT_SUPPORT)
   {
     if (c == '\n')
     {                       // Newline?

src/Arduino_GFX.h

@@ -18,6 +18,11 @@
 #define DEGTORAD 0.017453292519943295769236907684886F
 #endif
 
+#if __has_include(<U8g2lib.h>)
+#include <u8g2lib.h>
+#define U8G2_FONT_SUPPORT
+#endif
+
 // Color definitions
 #define BLACK 0x0000       ///<   0,   0,   0
 #define NAVY 0x000F        ///<   0,   0, 123
@@ -189,6 +194,9 @@ class Arduino_GFX : public Print, public Arduino_G
 
 #if !defined(ATTINY_CORE)
   void setFont(const GFXfont *f = NULL);
+#if defined(U8G2_FONT_SUPPORT)
+  void setFont(const uint8_t *font);
+#endif // defined(U8G2_FONT_SUPPORT)
   virtual void flush(void);
 #endif // !defined(ATTINY_CORE)
 
@@ -375,9 +383,13 @@ class Arduino_GFX : public Print, public Arduino_G
       wrap,   ///< If set, 'wrap' text at right edge of display
       _cp437; ///< If set, use correct CP437 charset (default is off)
 #if !defined(ATTINY_CORE)
-  GFXfont
-      *gfxFont; ///< Pointer to special font
-#endif          // !defined(ATTINY_CORE)
+  GFXfont *gfxFont; ///< Pointer to special font
+#endif              // !defined(ATTINY_CORE)
+
+#if defined(U8G2_FONT_SUPPORT)
+  uint8_t *u8g2Font;
+#endif // defined(U8G2_FONT_SUPPORT)
+
 #if defined(LITTLE_FOOT_PRINT)
   int16_t
       WIDTH,  ///< This is the 'raw' display width - never changes

src/Arduino_TFT.cpp

@@ -1065,8 +1065,15 @@ void Arduino_TFT::drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color
       endWrite();
     }
   }
-  else // 'Classic' built-in font
+  else // not gfxFont
 #endif // !defined(ATTINY_CORE)
+#if defined(U8G2_FONT_SUPPORT)
+      if (u8g2Font)
+  {
+    Arduino_GFX::drawChar(x, y, c, color, bg);
+  }
+  else // not u8g2Font
+#endif // defined(U8G2_FONT_SUPPORT)
   {
     block_w = 6 * textsize_x;
     block_h = 8 * textsize_y;