Thank you Black

bookwyrm/migrations/0076_book_preview_image.py

@@ -12,8 +12,10 @@ class Migration(migrations.Migration):
 
     operations = [
         migrations.AddField(
-            model_name='book',
+            model_name="book",
-            name='preview_image',
+            name="preview_image",
-            field=bookwyrm.models.fields.ImageField(blank=True, null=True, upload_to='cover_previews/'),
+            field=bookwyrm.models.fields.ImageField(
+                blank=True, null=True, upload_to="cover_previews/"
+            ),
         ),
     ]

bookwyrm/preview_images.py

@@ -33,6 +33,7 @@ path = Path(__file__).parent.absolute()
 font_dir = path.joinpath("static/fonts/public_sans")
 icon_font_dir = path.joinpath("static/css/fonts")
 
+
 def get_font(font_name, size=28):
     if font_name == "light":
         font_path = "%s/PublicSans-Light.ttf" % font_dir
@@ -99,7 +100,9 @@ def generate_instance_layer(content_width):
 
     line_width = 50 + 10 + font_instance.getsize(site.name)[0]
 
-    line_layer = Image.new("RGBA", (line_width, 2), color=(*(ImageColor.getrgb(TEXT_COLOR)), 50))
+    line_layer = Image.new(
+        "RGBA", (line_width, 2), color=(*(ImageColor.getrgb(TEXT_COLOR)), 50)
+    )
     instance_layer.alpha_composite(line_layer, (0, 60))
 
     return instance_layer
@@ -115,9 +118,13 @@ def generate_rating_layer(rating, content_width):
     icon_size = 64
     icon_margin = 10
 
-    rating_layer_base = Image.new("RGBA", (content_width, icon_size), color=TRANSPARENT_COLOR)
+    rating_layer_base = Image.new(
+        "RGBA", (content_width, icon_size), color=TRANSPARENT_COLOR
+    )
     rating_layer_color = Image.new("RGBA", (content_width, icon_size), color=TEXT_COLOR)
-    rating_layer_mask = Image.new("RGBA", (content_width, icon_size), color=TRANSPARENT_COLOR)
+    rating_layer_mask = Image.new(
+        "RGBA", (content_width, icon_size), color=TRANSPARENT_COLOR
+    )
 
     position_x = 0
 
@@ -136,7 +143,9 @@ def generate_rating_layer(rating, content_width):
     rating_layer_mask = rating_layer_mask.getchannel("A")
     rating_layer_mask = ImageOps.invert(rating_layer_mask)
 
-    rating_layer_composite = Image.composite(rating_layer_base, rating_layer_color, rating_layer_mask)
+    rating_layer_composite = Image.composite(
+        rating_layer_base, rating_layer_color, rating_layer_mask
+    )
 
     return rating_layer_composite
 
@@ -144,15 +153,19 @@ def generate_rating_layer(rating, content_width):
 def generate_default_cover():
     font_cover = get_font("light", size=28)
 
-    cover_width = math.floor(cover_img_limits * .7)
+    cover_width = math.floor(cover_img_limits * 0.7)
-    default_cover = Image.new("RGB", (cover_width, cover_img_limits), color=DEFAULT_COVER_COLOR)
+    default_cover = Image.new(
+        "RGB", (cover_width, cover_img_limits), color=DEFAULT_COVER_COLOR
+    )
     default_cover_draw = ImageDraw.Draw(default_cover)
 
     text = "no cover :("
     text_dimensions = font_cover.getsize(text)
-    text_coords = (math.floor((cover_width - text_dimensions[0]) / 2),
+    text_coords = (
-                   math.floor((cover_img_limits - text_dimensions[1]) / 2))
+        math.floor((cover_width - text_dimensions[0]) / 2),
-    default_cover_draw.text(text_coords, text, font=font_cover, fill='white')
+        math.floor((cover_img_limits - text_dimensions[1]) / 2),
+    )
+    default_cover_draw.text(text_coords, text, font=font_cover, fill="white")
 
     return default_cover
 
@@ -177,13 +190,15 @@ def generate_preview_image(book_id, rating=None):
         dominant_color = ImageColor.getrgb(DEFAULT_COVER_COLOR)
 
     # Color
-    if BG_COLOR == 'use_dominant_color':
+    if BG_COLOR == "use_dominant_color":
         image_bg_color = "rgb(%s, %s, %s)" % dominant_color
         # Lighten color
         image_bg_color_rgb = [x / 255.0 for x in ImageColor.getrgb(image_bg_color)]
         image_bg_color_hls = colorsys.rgb_to_hls(*image_bg_color_rgb)
         image_bg_color_hls = (image_bg_color_hls[0], 0.9, image_bg_color_hls[1])
-        image_bg_color = tuple([math.ceil(x * 255) for x in colorsys.hls_to_rgb(*image_bg_color_hls)])
+        image_bg_color = tuple(
+            [math.ceil(x * 255) for x in colorsys.hls_to_rgb(*image_bg_color_hls)]
+        )
     else:
         image_bg_color = BG_COLOR
 
@@ -197,7 +212,9 @@ def generate_preview_image(book_id, rating=None):
     instance_layer = generate_instance_layer(content_width)
     texts_layer = generate_texts_layer(book, content_width)
 
-    contents_layer = Image.new("RGBA", (content_width, IMG_HEIGHT), color=TRANSPARENT_COLOR)
+    contents_layer = Image.new(
+        "RGBA", (content_width, IMG_HEIGHT), color=TRANSPARENT_COLOR
+    )
     contents_composite_y = 0
     contents_layer.alpha_composite(instance_layer, (0, contents_composite_y))
     contents_composite_y = contents_composite_y + instance_layer.height + gutter
@@ -234,7 +251,7 @@ def generate_preview_image(book_id, rating=None):
         try:
             old_path = book.preview_image.path
         except ValueError:
-            old_path = ''
+            old_path = ""
 
         # Save
         img.save(image_buffer, format="png")

bookwyrm/settings.py

@@ -40,11 +40,11 @@ DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 # Preview image
 
 # Specify RGB tuple or RGB hex strings, or 'use_dominant_color'
-PREVIEW_BG_COLOR = 'use_dominant_color'
+PREVIEW_BG_COLOR = "use_dominant_color"
 PREVIEW_IMG_WIDTH = 1200
 PREVIEW_IMG_HEIGHT = 630
-PREVIEW_TEXT_COLOR = '#363636'
+PREVIEW_TEXT_COLOR = "#363636"
-PREVIEW_DEFAULT_COVER_COLOR = '#002549'
+PREVIEW_DEFAULT_COVER_COLOR = "#002549"
 
 # Quick-start development settings - unsuitable for production
 # See https://docs.djangoproject.com/en/3.2/howto/deployment/checklist/