From bb06503bc6e5e27c4bda3bb4359ec82cfb3b5ed5 Mon Sep 17 00:00:00 2001
From: Matt Singleton <matt@xcolour.net>
Date: Sat, 3 Feb 2024 14:02:03 -0600
Subject: initial checkin

---
 epdify.py | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 epdify.py

(limited to 'epdify.py')

diff --git a/epdify.py b/epdify.py
new file mode 100644
index 0000000..3bf1326
--- /dev/null
+++ b/epdify.py
@@ -0,0 +1,133 @@
+import os
+import sys
+
+from PIL import Image, ImageDraw, ImageFont, ImagePalette, ImageOps
+
+_palettes = {
+    "perceived": (
+        34, 30, 53,    # black
+        233, 235, 234, # white
+        52, 102, 77,   # green
+        50, 51, 116,   # blue
+        205, 86, 82,   # red
+        236, 216, 101, # yellow
+        209, 121, 97,  # orange
+    ),
+    "native": (
+        0, 0, 0,       # black
+        255, 255, 255, # white
+        0, 255, 0,     # green
+        0, 0, 255,     # blue
+        255, 0, 0,     # red
+        255, 255, 0,   # yellow
+        255, 128, 0,   # orange
+    ),
+}
+
+_font_stacks = {
+    "nimbus": {
+        "bold": "/usr/share/fonts/urw-base35/NimbusSansNarrow-Bold.t1",
+        "regular": "/usr/share/fonts/urw-base35/NimbusSansNarrow-Regular.t1",
+    },
+    "fira": {
+        "bold": "/usr/share/fonts/mozilla-fira/FiraSansCondensed-Medium.otf",
+        "regular": "/usr/share/fonts/mozilla-fira/FiraSansCondensed-Light.otf",
+    },
+    "liberation": {
+        "bold": "/usr/share/fonts/liberation-narrow/LiberationSansNarrow-Bold.ttf",
+        "regular": "/usr/share/fonts/liberation-narrow/LiberationSansNarrow.ttf",
+    },
+    "source": {
+        "bold": "/home/matt/Downloads/sourcesans/TTF/SourceSans3-Semibold.ttf",
+        "regular": "/home/matt/Downloads/sourcesans/TTF/SourceSans3-Medium.ttf",
+    },
+    "plex": {
+        "bold": "/usr/share/fonts/ibm-plex-sans-fonts/IBMPlexSansCondensed-SemiBold.otf",
+        "regular": "/usr/share/fonts/ibm-plex-sans-fonts/IBMPlexSansCondensed-Medium.otf",
+    },
+}
+
+def _get_palette_image(palette):
+    img = Image.new("P", (0, 0))
+    img.putpalette(palette)
+    return img
+
+
+# "public" methods
+
+
+def get_crop_box_and_orientation(width, height, ratio):
+    """
+    returns the orientation and bounding box to crop an image with
+    the given height and width to the given aspect ratio.
+    """
+    if width < height:
+        orientation = "portrait"
+        if width / height > ratio:
+            # trim width
+            px_to_trim = width - (height * ratio)
+            box = (
+                px_to_trim / 2,
+                0,
+                width - (px_to_trim / 2),
+                height
+            )
+        else:
+            # trim height
+            px_to_trim = height - (width / ratio)
+            box = (
+                0,
+                px_to_trim / 2,
+                width,
+                height - (px_to_trim / 2)
+            )
+    else:
+        orientation = "landscape"
+        if width / height > 1 / ratio:
+            # trim width
+            px_to_trim = width - (height * (1 / ratio))
+            box = (
+                px_to_trim / 2,
+                0,
+                width - (px_to_trim / 2),
+                height
+            )
+        else:
+            # trim height
+            px_to_trim = height - (width / (1 / ratio))
+            box = (
+                0,
+                px_to_trim / 2,
+                width,
+                height - (px_to_trim / 2)
+            )
+    return tuple(int(x) for x in box), orientation
+
+
+def get_bounded_font(font_name, font_weight, text, target_size, min_size, max_width):
+    font_filename = _font_stacks[font_name.lower()][font_weight.lower()]
+    size = target_size
+    font = ImageFont.truetype(font_filename, size=size)
+    while size > min_size and font.getlength(text) > max_width:
+        size -= 1
+        font = ImageFont.truetype(font_filename, size=size)
+    return font
+
+
+def epdify(image, dither_palette="perceived", final_palette="native"):
+    """
+    transforms the given input image into a scaled and dithered 7-color
+    image ready to be sent to the frame. expects image to be in the
+    correct aspect already (3x5 or 5x3), errors if not.
+    if 'simulate_perceived_palette' is True, returned image retains the
+    simulated paletted, suitable for reviewing images on a full-color
+    display, but not for loading on the frame.
+    """
+    img = image.quantize(
+        colors=7,
+        dither=Image.Dither.FLOYDSTEINBERG,
+        palette=_get_palette_image(_palettes[dither_palette.lower()]),
+        method=Image.Quantize.LIBIMAGEQUANT,
+    )
+    img.putpalette(_palettes[final_palette.lower()])
+    return img
-- 
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