fixes #540: load all sponsors at once

[wolnelektury.git] / apps / sponsors / models.py

diff --git a/apps/sponsors/models.py b/apps/sponsors/models.py
index a2e3e08..c7ecc6f 100644 (file)
--- a/apps/sponsors/models.py
+++ b/apps/sponsors/models.py
@@ -2,13 +2,19 @@
 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
+import time
+from StringIO import StringIO
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.template.loader import render_to_string
+from PIL import Image
 
 from sorl.thumbnail.fields import ImageWithThumbnailsField
 from sponsors.fields import JSONField
+from django.core.files.base import ContentFile
 
+THUMB_WIDTH=120
+THUMB_HEIGHT=120
 
 class Sponsor(models.Model):
     name = models.CharField(_('name'), max_length=120)
@@ -17,7 +23,7 @@ class Sponsor(models.Model):
         _('logo'),
         upload_to='sponsorzy/sponsor/logo',
         thumbnail={
-            'size': (120, 120),
+            'size': (THUMB_WIDTH, THUMB_HEIGHT),
             'extension': 'png',
             'options': ['pad', 'detail'],
         })
@@ -37,27 +43,48 @@ class SponsorPage(models.Model):
     name = models.CharField(_('name'), max_length=120)
     sponsors = JSONField(_('sponsors'), default={})
     _html = models.TextField(blank=True, editable=False)
+    sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
 
     def populated_sponsors(self):
         result = []
+        offset = 0
         for column in self.get_sponsors_value():
             result_group = {'name': column['name'], 'sponsors': []}
             sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
             for sponsor_pk in column['sponsors']:
                 try:
-                    result_group['sponsors'].append(sponsor_objects[sponsor_pk])
+                    result_group['sponsors'].append((offset, sponsor_objects[sponsor_pk]))
+                    offset -= THUMB_HEIGHT
                 except KeyError:
                     pass
             result.append(result_group)
         return result
 
+    def render_sprite(self):
+        sponsor_ids = []
+        for column in self.get_sponsors_value():
+            sponsor_ids.extend(column['sponsors'])
+        sponsors = Sponsor.objects.in_bulk(sponsor_ids)
+        sprite = Image.new('RGB', (THUMB_WIDTH, len(sponsors)*THUMB_HEIGHT))
+        for i, sponsor_id in enumerate(sponsor_ids):
+            simg = Image.open(sponsors[sponsor_id].logo.thumbnail.dest)
+            sprite.paste(simg, (0, i*THUMB_HEIGHT))
+        imgstr = StringIO()
+        sprite.save(imgstr, 'png')
+
+        if self.sprite:
+            self.sprite.delete(save=False)
+        self.sprite.save('sponsorzy/sprite/%s-%d.png' % (self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
+
     def html(self):
         return self._html
     html = property(fget=html)
 
     def save(self, *args, **kwargs):
+        self.render_sprite()
         self._html = render_to_string('sponsors/page.html', {
             'sponsors': self.populated_sponsors(),
+            'page': self
         })
         return super(SponsorPage, self).save(*args, **kwargs)