Use SHA1 for image file name

Author: allefeld

pptx2md/parser.py

@@ -44,8 +44,6 @@
 
 logger = logging.getLogger(__name__)
 
-picture_count = 0
-
 
 def is_title(shape):
     if shape.is_placeholder and (shape.placeholder_format.type == PP_PLACEHOLDER.TITLE or
@@ -148,10 +146,7 @@ def process_picture(config: ConversionConfig, shape, slide_idx) -> Union[ImageEl
     if config.disable_image:
         return None
 
-    global picture_count
-
-    file_prefix = ''.join(os.path.basename(config.pptx_path).split('.')[:-1])
-    pic_name = file_prefix + f'_{picture_count}'
+    pic_name = shape.image.sha1
     if shape.image.filename:
         pic_ext = shape.image.filename.split('.')[-1]
     else:
@@ -164,7 +159,6 @@ def process_picture(config: ConversionConfig, shape, slide_idx) -> Union[ImageEl
     img_outputter_path = os.path.relpath(output_path, common_path)
     with open(output_path, 'wb') as f:
         f.write(shape.image.blob)
-        picture_count += 1
 
     # normal images
     if config.disable_wmf or (pic_ext != 'wmf' and pic_ext != 'emf'):