Basic fontio wrapper added

[hackapet/Adafruit_Blinka_Displayio.git] / fontio.py

diff --git a/fontio.py b/fontio.py
new file mode 100644 (file)
index 0000000..976c54c
--- /dev/null
+++ b/fontio.py
@@ -0,0 +1,64 @@
+"""
+`fontio`
+"""
+
+__version__ = "0.0.0-auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_Blinka_displayio.git"
+
+from displayio import Bitmap
+from PIL import ImageFont
+
+
+class BuiltinFont:
+    def __init__(self):
+        self._font = ImageFont.load_default()
+        ascii = ""
+        for character in range(0x20, 0x7F):
+            ascii += chr(character)
+        self._font.getmask(ascii)
+        bmp_size = self._font.getsize(ascii)
+        self._bitmap = Bitmap(bmp_size[0], bmp_size[1], 2)
+        ascii_mask = self._font.getmask(ascii, mode="1")
+        for x in range(bmp_size[0]):
+            for y in range(bmp_size[1]):
+                self._bitmap[x, y] = 1 if ascii_mask.getpixel((x, y)) else 0
+
+    def _get_glyph_index(self, charcode):
+        if 0x20 <= charcode <= 0x7E:
+            return charcode - 0x20
+
+    def get_bounding_box(self):
+        """Returns the maximum bounds of all glyphs in the font in a tuple of two values: width, height."""
+        return self._font.getsize("M")
+
+    def get_glyph(self, codepoint):
+        """Returns a `fontio.Glyph` for the given codepoint or None if no glyph is available."""
+        bounding_box = self._font.getsize(chr(codepoint))
+        return Glyph(
+            bitmap=self._bitmap,
+            tile_index=self._get_glyph_index(codepoint),
+            width=bounding_box[0],
+            height=bounding_box[1],
+            dx=0,
+            dy=0,
+            shift_x=0,
+            shift_y=0,
+        )
+
+    @property
+    def bitmap(self):
+        """Bitmap containing all font glyphs starting with ASCII and followed by unicode. Use `get_glyph` in most cases. This is useful for use with `displayio.TileGrid` and `terminalio.Terminal`.
+        """
+        return self._bitmap
+
+
+class Glyph:
+    def __init__(self, *, bitmap, tile_index, width, height, dx, dy, shift_x, shift_y):
+        self.bitmap = bitmap
+        self.width = width
+        self.height = height
+        self.dx = dx
+        self.dy = dy
+        self.shift_x = shift_x
+        self.shift_y = shift_y
+        self.tile_index = tile_index