Don’t limit the opacity groups to the original box size

It doesn’t work when elements are displayed outside or when the box is transformed.
Kozea · Jul 5, 2022 · 3bd9a8e · 3bd9a8e
1 parent 1a4d2a7
commit 3bd9a8e
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Showing 2 changed files with 23 additions and 4 deletions.
diff --git a/tests/draw/test_transform.py b/tests/draw/test_transform.py
@@ -285,3 +285,25 @@ def test_2d_transform_13(assert_pixels):
               font-size: 0 }
       </style>
       <div><img src="pattern.png"></div>''')
+
+
+@assert_no_logs
+def test_2d_transform_opacity(assert_pixels):
+    assert_pixels('''
+        __________
+        __________
+        __________
+        _ss_______
+        _ss_______
+        __________
+        __________
+        __________
+        __________
+        __________
+    ''', '''
+      <style>
+        @page { size: 10px; margin: 2px; }
+        div { transform: translate(-1px, 1px); background: red;
+              height: 2px; width: 2px; opacity: 0.5 }
+      </style>
+      <div></div>''')
diff --git a/weasyprint/draw.py b/weasyprint/draw.py
@@ -108,10 +108,7 @@ def draw_stacking_context(stream, stacking_context):
 
         if box.style['opacity'] < 1:
             original_stream = stream
-            stream = stream.add_group([
-                box.border_box_x(), box.border_box_y(),
-                box.border_box_x() + box.border_width(),
-                box.border_box_y() + box.border_height()])
+            stream = stream.add_group(stream.page_rectangle)
 
         if box.transformation_matrix:
             if box.transformation_matrix.determinant: