Invoices: Add support for event-fonts

doc/development/api/invoice.rst

@@ -84,6 +84,8 @@ convenient to you:
 
    .. automethod:: _register_fonts
 
+   .. automethod:: _register_event_fonts
+
    .. automethod:: _on_first_page
 
    .. automethod:: _on_other_page

src/pretix/base/invoice.py

@@ -182,7 +182,7 @@ class BaseReportlabInvoiceRenderer(BaseInvoiceRenderer):
         pdfmetrics.registerFontFamily('OpenSans', normal='OpenSans', bold='OpenSansBd',
                                       italic='OpenSansIt', boldItalic='OpenSansBI')
 
-        for family, styles in get_fonts().items():
+        for family, styles in get_fonts(event=self.event, pdf_support_required=True).items():
             if family == self.event.settings.invoice_renderer_font:
                 pdfmetrics.registerFont(TTFont(family, finders.find(styles['regular']['truetype'])))
                 self.font_regular = family

src/pretix/control/forms/event.py

@@ -935,6 +935,9 @@ class InvoiceSettingsForm(EventSettingsValidationMixin, SettingsForm):
             )
         )
         self.fields['invoice_generate'].choices = generate_choices
+        self.fields['invoice_renderer_font'].choices += [
+            (a, a) for a in get_fonts(event, pdf_support_required=True).keys()
+        ]
 
 
 def contains_web_channel_validate(val):

src/pretix/presale/style.py

@@ -203,7 +203,8 @@ def regenerate_organizer_css(organizer_id: int, regenerate_events=True):
 
 register_fonts = Signal()
 """
-Return a dictionaries of the following structure. Paths should be relative to static root.
+Return a dictionaries of the following structure. Paths should be relative to static root or an absolute URL. In the
+latter case, the fonts won't be available for PDF-rendering.
 
 {
     "font name": {
@@ -228,8 +229,10 @@ Return a dictionaries of the following structure. Paths should be relative to st
 
 register_event_fonts = EventPluginSignal()
 """
-Return a dictionaries of the following structure. Paths should be relative to static root.
+Return a dictionaries of the following structure. Paths should be relative to static root or an absolute URL. In the
+latter case, the fonts won't be available for PDF-rendering.
 As with all plugin signals, the ``sender`` keyword argument will contain the event.
+
 {
     "font name": {
         "regular": {