From 69bc452c65980903b309d075087941c5f5430cb1 Mon Sep 17 00:00:00 2001
From: Daniel Thompson <daniel@redfelineninja.org.uk>
Date: Mon, 9 Mar 2020 21:29:35 +0000
Subject: draw565: Optimize the font rendering

This is a big one... more than 4x increase in font rendering performance!

diff --git a/wasp/draw565.py b/wasp/draw565.py
index e1beb51..bd72c65 100644
--- a/wasp/draw565.py
+++ b/wasp/draw565.py
@@ -47,17 +47,19 @@ def _bounding_box(s, font):
 
     return (w, h)
 
+@micropython.native
 def _draw_glyph(display, glyph, x, y, bgfg):
     (px, h, w) = glyph
 
     buf = memoryview(display.linebuffer)[0:2*(w+1)]
+    buf[2*w] = 0
+    buf[2*w + 1] = 0
     bytes_per_row = (w + 7) // 8
 
+    display.set_window(x, y, w+1, h)
     for row in range(h):
         _bitblit(buf, px[row*bytes_per_row:], bgfg, w)
-        buf[2*w] = 0
-        buf[2*w + 1] = 0
-        display.rawblit(buf, x, y+row, w+1, 1)
+        display.write_data(buf)
 
 class Draw565(object):
     """Drawing library for RGB565 displays.
-- 
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