fix

[librarian.git] / src / librarian / elements / figures / ilustr.py

diff --git a/src/librarian/elements/figures/ilustr.py b/src/librarian/elements/figures/ilustr.py
index 3c3026c..51bae4e 100644 (file)
--- a/src/librarian/elements/figures/ilustr.py
+++ b/src/librarian/elements/figures/ilustr.py
@@ -1,12 +1,94 @@
+# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Wolne Lektury. See NOTICE for more information.
+#
+import io
+import urllib.parse
+import urllib.request
+from PIL import Image
 from ..base import WLElement
 
 
+MAX_PNG_WEIGHT = 200000
+
+
 class Ilustr(WLElement):
-    HTML_TAG = 'img'
+    NUMBERING = 'i'
+
+    EPUB_TAG = HTML_TAG = 'img'
 
     def get_html_attr(self, builder):
+        cls = 'ilustr'
+        if self.attrib.get('wyrownanie'):
+            cls += ' ' + self.attrib['wyrownanie']
+        if self.attrib.get('oblew'):
+            cls += ' oblew'
+        attr = {
+            'class': cls,
+            'alt': self.attrib.get('alt', ''),
+            'title': self.attrib.get('alt', ''),
+            'src': self.attrib.get('src', ''),
+            }
+        if self.attrib.get('srcset'):
+            attr['srcset'] = self.attrib['srcset']
+            attr['sizes'] = '''
+            (min-width: 718px) 600px,
+            (min-width: 600px) calc(100vw - 118px),
+            (min-width: 320px) calc(100vw - 75px),
+            (min-width: 15em) calc(100wv - 60px),
+            calc(100wv - 40px)
+            '''
+        if self.attrib.get('szer'):
+            attr['style'] = 'width: ' + self.attrib['szer']
+        return attr
+
+    def get_epub_attr(self, builder):
+        url = urllib.parse.urljoin(
+            builder.base_url,
+            self.get('src')
+        )
+        
+        imgfile = urllib.request.urlopen(url)
+        img = Image.open(imgfile)
+        th_format, ext, media_type = {
+            'GIF': ('GIF', 'gif', 'image/gif'),
+            'PNG': ('PNG', 'png', 'image/png'),
+        }.get(img.format, ('JPEG', 'jpg', 'image/jpeg'))
+
+        width = 600
+        if img.size[0] < width:
+            th = img
+        else:
+            th = img.resize((width, round(width * img.size[1] / img.size[0])))
+
+        buffer = io.BytesIO()
+        th.save(buffer, format=th_format)
+
+        # Limit PNG to 200K. If larger, convert to JPEG.
+        if th_format == 'PNG' and buffer.tell() > MAX_PNG_WEIGHT:
+            th_format, ext, media_type = 'JPEG', 'jpg', 'image/jpeg'
+            if th.mode != 'RGB':
+                buffer = io.BytesIO()
+                th = Image.alpha_composite(
+                    Image.new('RGBA', th.size, '#fff'),
+                    th.convert('RGBA')
+                )
+                th = th.convert('RGB')
+            th.save(buffer, format=th_format)
+
+        imgfile.close()
+        file_name = 'image%d.%s' % (
+            builder.assign_image_number(),
+            ext
+        )
+
+        builder.add_file(
+            content=buffer.getvalue(),
+            file_name=file_name,
+            media_type=media_type,
+        )
+        
         return {
-            'src': builder.base_url + self.attrib['src'],
-            'alt': self.attrib['alt'],
-            'title': self.attrib['alt'],
+            'src': file_name,
+            'alt': self.attrib.get('alt', ''),
+            'title': self.attrib.get('alt', ''),
         }