Tests/LibGfx: Expand JBIG2 TPGRON tests

This adds tests like the ones added in #26436, but for refinement
regions and TPGRON.

We accidentally get this case right already: The adaptive refinement
pixel for template 0 is in the top left corners, and template 1 doesn't
have any refinement pixels. See figures 12-15 in the spec.

Since the SLTP context for refinement regions has all-white pixels,
we don't need the double-xor trick, we can just use the default "or"
operator and draw on top of the correct bitmap. If everything works,
the or'd bitmap will be all white and won't change the result.

No behavior change.

Author: nico

Tests/LibGfx/test-inputs/jbig2/bitmap-refine-template1-tpgron.jbig2

@@ -46,6 +46,43 @@
         },
         {
             "segment_number": 3,
+            "type": "intermediate_generic_region",
+            "page_association": 1,
+            "retained": true,
+            "data": {
+                "image_data": {
+                    "from_file": "tpgron-ref.bmp",
+                    "repeat_x": 66,
+                    "repeat_y": 33
+                }
+            }
+        },
+        {
+            "segment_number": 4,
+            "type": "generic_refinement_region",
+            "page_association": 1,
+            "referred_to_segments": [
+                {
+                    "segment_number": 3,
+                    "retained": true
+                }
+            ],
+            "data": {
+                "image_data": {
+                    "from_file": "bitmap.bmp",
+                    "crop": {
+                        "width": 198,
+                        "height": 99
+                    }
+                },
+                "flags": {
+                    "gr_template": 1,
+                    "use_typical_prediction": true
+                }
+            }
+        },
+        {
+            "segment_number": 5,
             "type": "end_of_page",
             "page_association": 1
         }

Tests/LibGfx/test-inputs/jbig2/bitmap-refine-tpgron.jbig2

@@ -45,6 +45,42 @@
         },
         {
             "segment_number": 3,
+            "type": "intermediate_generic_region",
+            "page_association": 1,
+            "retained": true,
+            "data": {
+                "image_data": {
+                    "from_file": "tpgron-ref.bmp",
+                    "repeat_x": 66,
+                    "repeat_y": 33
+                }
+            }
+        },
+        {
+            "segment_number": 4,
+            "type": "generic_refinement_region",
+            "page_association": 1,
+            "referred_to_segments": [
+                {
+                    "segment_number": 3,
+                    "retained": true
+                }
+            ],
+            "data": {
+                "image_data": {
+                    "from_file": "bitmap.bmp",
+                    "crop": {
+                        "width": 198,
+                        "height": 99
+                    }
+                },
+                "flags": {
+                    "use_typical_prediction": true
+                }
+            }
+        },
+        {
+            "segment_number": 5,
             "type": "end_of_page",
             "page_association": 1
         }