feat: add svg_to_png_base64 function for converting SVG to base64 encoded PNG

utils.py

@@ -0,0 +1,48 @@
+import base64
+
+
+import cairosvg
+import io
+import base64
+from PIL import Image
+
+
+def svg_to_png_base64(svg_content: str, width=800, height=800) -> tuple[str, str]:
+    """Convert SVG to PNG and return as base64 encoded string with media type.
+
+    Args:
+        svg_content: SVG markup string
+        width: Desired PNG width
+        height: Desired PNG height
+
+    Returns:
+        Tuple of (media_type, base64_string)
+    """
+    try:
+        # Convert SVG to PNG using cairosvg
+        png_data = cairosvg.svg2png(
+            bytestring=svg_content.encode("utf-8"),
+            output_width=width,
+            output_height=height,
+        )
+
+        # Open PNG with Pillow to ensure correct format
+        img = Image.open(io.BytesIO(png_data))
+
+        # Convert to RGB if needed
+        if img.mode != "RGB":
+            img = img.convert("RGB")
+
+        # Save as PNG to bytes
+        img_byte_arr = io.BytesIO()
+        img.save(img_byte_arr, format="PNG")
+        img_byte_arr = img_byte_arr.getvalue()
+
+        # Encode to base64
+        base64_str = base64.b64encode(img_byte_arr).decode("utf-8")
+
+        return "image/png", base64_str
+
+    except Exception as e:
+        print(f"Error converting SVG to PNG: {e}")
+        return "", ""