feat(ui_builders_shared): implement def icon_from_svg_data_url

scanslicer/ui_builders_shared.py

@@ -35,3 +35,39 @@ def _icon_color_from_palette(palette):
         + (0.0722 * window_color.blueF())
     )
     return "#1f1f1f" if luma >= 0.5 else "#f2f2f2"
+
+
+# icon_from_svg_data_url: function definition for ScanSlicer behavior.
+def icon_from_svg_data_url(data_url, size=24, color_hex=None, palette=None):
+    prefix = "data:image/svg+xml;base64,"
+    if not data_url.startswith(prefix):
+        return None
+
+    try:
+        svg_bytes = base64.b64decode(data_url[len(prefix):], validate=True)
+    except Exception:
+        return None
+
+    if color_hex is None:
+        color_hex = _icon_color_from_palette(palette)
+
+    # Most toolbar SVGs use "currentColor"; replace it with the resolved color.
+    if color_hex:
+        try:
+            svg_text = svg_bytes.decode("utf-8")
+            svg_text = svg_text.replace("currentColor", color_hex)
+            svg_text = svg_text.replace("currentcolor", color_hex)
+            svg_bytes = svg_text.encode("utf-8")
+        except UnicodeDecodeError:
+            pass
+
+    renderer = QSvgRenderer(svg_bytes)
+    if not renderer.isValid():
+        return None
+
+    pixmap = QPixmap(size, size)
+    pixmap.fill(Qt.GlobalColor.transparent)
+    painter = QPainter(pixmap)
+    renderer.render(painter)
+    painter.end()
+    return QIcon(pixmap)