feat: Extracting picture data for raster images found in PPTX

docling/backend/mspowerpoint_backend.py

@@ -10,11 +10,13 @@
     DoclingDocument,
     DocumentOrigin,
     GroupLabel,
+    ImageRef,
     ProvenanceItem,
     Size,
     TableCell,
     TableData,
 )
+from PIL import Image
 from pptx import Presentation
 from pptx.enum.shapes import MSO_SHAPE_TYPE, PP_PLACEHOLDER
 
@@ -268,9 +270,20 @@ def handle_title(self, shape, parent_slide, slide_ind, doc):
         return
 
     def handle_pictures(self, shape, parent_slide, slide_ind, doc):
+        # Get the image bytes
+        image = shape.image
+        image_bytes = image.blob
+        # Open it with PIL
+        pil_image = Image.open(BytesIO(image_bytes))
+
         # shape has picture
         prov = self.generate_prov(shape, slide_ind, "")
-        doc.add_picture(parent=parent_slide, caption=None, prov=prov)
+        doc.add_picture(
+            parent=parent_slide,
+            image=ImageRef.from_pil(image=pil_image, dpi=72),
+            caption=None,
+            prov=prov,
+        )
         return
 
     def handle_tables(self, shape, parent_slide, slide_ind, doc):

tests/data/groundtruth/docling_v2/powerpoint_sample.pptx.itxt

@@ -0,0 +1,35 @@
+item-0 at level 0: unspecified: group _root_
+  item-1 at level 1: chapter: group slide-0
+    item-2 at level 2: title: Test Table Slide
+    item-3 at level 2: paragraph: With footnote
+    item-4 at level 2: table with [9x7]
+  item-5 at level 1: chapter: group slide-1
+    item-6 at level 2: title: Second slide title
+    item-7 at level 2: paragraph: Let’s introduce a list
+    item-8 at level 2: paragraph: With foo
+    item-9 at level 2: paragraph: Bar
+    item-10 at level 2: paragraph: And baz things
+    item-11 at level 2: paragraph: A rectangle shape with this text inside.
+  item-12 at level 1: chapter: group slide-2
+    item-13 at level 2: ordered_list: group list
+      item-14 at level 3: list_item: List item4
+      item-15 at level 3: list_item: List item5
+      item-16 at level 3: list_item: List item6
+    item-17 at level 2: list: group list
+      item-18 at level 3: list_item: I1
+      item-19 at level 3: list_item: I2
+      item-20 at level 3: list_item: I3
+      item-21 at level 3: list_item: I4
+    item-22 at level 2: paragraph: Some info:
+    item-23 at level 2: list: group list
+      item-24 at level 3: list_item: Item A
+      item-25 at level 3: list_item: Item B
+    item-26 at level 2: paragraph: Maybe a list?
+    item-27 at level 2: ordered_list: group list
+      item-28 at level 3: list_item: List1
+      item-29 at level 3: list_item: List2
+      item-30 at level 3: list_item: List3
+    item-31 at level 2: list: group list
+      item-32 at level 3: list_item: l1 
+      item-33 at level 3: list_item: l2
+      item-34 at level 3: list_item: l3