Add 2k and 4k scale sizes

news/+bigscales.feature

@@ -0,0 +1,5 @@
+Add larger scales to `plone.allowed_sizes` for new sites. This helps avoid the
+need to serve the original image which can be very large. @davisagli
+
+- `2k` is large enough for a default-width image on a high-density display.
+- `4k` is large enough for a full-width images on high-density viewports up to 2000 pixels wide.

src/plone/volto/profiles/default/metadata.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <metadata>
-  <version>1019</version>
+  <version>1100</version>
   <dependencies>
     <dependency>profile-plone.restapi:blocks</dependency>
   </dependencies>

src/plone/volto/profiles/default/registry/plone.base.interfaces.controlpanel.IImagingSchema.xml

@@ -5,10 +5,8 @@
   <record field="allowed_sizes"
           interface="plone.base.interfaces.controlpanel.IImagingSchema"
           name="plone.allowed_sizes"
-          purge="True"
   >
-    <!-- Purge the existing ones! -->
-    <value>
+    <value purge="true">
       <element>icon 32:32</element>
       <element>tile 64:64</element>
       <element>thumb 128:128</element>
@@ -19,6 +17,8 @@
       <element>larger 1000:65536</element>
       <element>great 1200:65536</element>
       <element>huge 1600:65536</element>
+      <element>2k 2000:65536</element>
+      <element>4k 4000:65536</element>
     </value>
   </record>
 </registry>

src/plone/volto/upgrades.py

@@ -190,3 +190,12 @@ def update_robots_txt(context):
         logger.info(
             "Ignoring plone.robots_txt registry as it was modified in this portal."
         )
+
+
+def add_large_image_scales(context):
+    value = api.portal.get_registry_record("plone.allowed_sizes")
+    if not any(item.startswith("2k ") for item in value):
+        value.append("2k 2000:65536")
+    if not any(item.startswith("4k ") for item in value):
+        value.append("4k 4000:65536")
+    api.portal.set_registry_record("plone.allowed_sizes", value)

src/plone/volto/upgrades.zcml

@@ -96,4 +96,15 @@
         handler=".upgrades.update_robots_txt"
         />
   </genericsetup:upgradeSteps>
+
+  <genericsetup:upgradeSteps
+      profile="plone.volto:default"
+      source="1019"
+      destination="1100"
+      >
+    <genericsetup:upgradeStep
+        title="Update robots_txt setting for Volto"
+        handler=".upgrades.add_large_image_scales"
+        />
+  </genericsetup:upgradeSteps>
 </configure>

tests/setup/test_setup_install.py

@@ -16,7 +16,7 @@ def test_browserlayer(self, browser_layers):
 
     def test_latest_version(self, profile_last_version):
         """Test latest version of default profile."""
-        assert profile_last_version(f"{PACKAGE_NAME}:default") == "1019"
+        assert profile_last_version(f"{PACKAGE_NAME}:default") == "1100"
 
     @pytest.mark.parametrize(
         "portal_type,behavior",