Gros refactoring

backend/convert_pdf.py

@@ -0,0 +1,46 @@
+"""     
+    Fabrique à documents
+    Copyright (C) 2023  François Pelletier
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>. 
+"""
+
+
+import os
+
+from wand.color import Color
+from wand.image import Image
+
+
+def convert_pdf(filename, filetype, output_path, resolution=300):
+    """ Convert a PDF into images.
+
+        All the pages will give a single png file with format:
+        {pdf_filename}-{page_number}.png
+
+        The function removes the alpha channel from the image and
+        replace it with a white background.
+    """
+    all_pages = Image(filename=filename, resolution=resolution)
+    for i, page in enumerate(all_pages.sequence):
+        with Image(page) as img:
+            img.format = filetype
+            img.background_color = Color('white')
+            img.alpha_channel = 'remove'
+
+            image_filename = os.path.splitext(os.path.basename(filename))[0]
+            image_filename = f'{image_filename}-{i:03}.{filetype}'
+            image_filename = os.path.join(output_path, image_filename)
+
+            img.save(filename=image_filename)