Fix libreoffice impress evaluation (#209)

Co-authored-by: chenjix <211250101@smail.nju.edu.cn>

desktop_env/evaluators/metrics/slides.py

@@ -389,10 +389,22 @@ def evaluate_presentation_fill_to_rgb_distance(pptx_file, rules):
     except:
         original_rgb = None
 
+    def get_rgb_from_color(color):
+        try:
+            if hasattr(color, "rgb"):
+                return color.rgb
+            else:
+                return None
+        except:
+            return None
+
     def slide_fill_distance_to_rgb(_slide, _rgb, _original_rgb):
         fill = _slide.background.fill
         if fill.type == 1:
-            r1, g1, b1 = fill.fore_color.rgb
+            color_rgb = get_rgb_from_color(fill.fore_color)
+            if color_rgb is None:
+                return 1
+            r1, g1, b1 = color_rgb
             r2, g2, b2 = _rgb
 
             if _original_rgb is not None:
@@ -404,7 +416,10 @@ def evaluate_presentation_fill_to_rgb_distance(pptx_file, rules):
         elif fill.type == 5:
             master_fill = _slide.slide_layout.slide_master.background.fill
             if master_fill.type == 1:
-                r1, g1, b1 = master_fill.fore_color.rgb
+                color_rgb = get_rgb_from_color(master_fill.fore_color)
+                if color_rgb is None:
+                    return 1
+                r1, g1, b1 = color_rgb
             else:
                 return 1
             r2, g2, b2 = _rgb

desktop_env/evaluators/metrics/vlc.py

@@ -117,7 +117,7 @@ def compare_images(image1_path, image2_path, **options):
     similarity_index = ssim(image1_array, image2_array)
 
     epsilon = 0.01
-    if base_score is None:
+    if base_score is not None:
         if similarity_index >= base_score + epsilon:
             return (similarity_index - base_score) / (1 - base_score)
         else: