add "Forbid too small crop region" option

modules/masking.py

@@ -77,6 +77,44 @@ def expand_crop_region(crop_region, processing_width, processing_height, image_w
     return x1, y1, x2, y2
 
 
+def expand_too_small_crop_region(crop_region, processing_width, processing_height, image_width, image_height):
+    """expands crop region to not have width and height smaller then processing_width and processing_height"""
+
+    x1, y1, x2, y2 = crop_region
+
+    desired_w = processing_width
+    diff_w = desired_w - (x2 - x1)
+    if diff_w > 0:
+        diff_w_l = diff_w // 2
+        diff_w_r = diff_w - diff_w_l
+        x1 -= diff_w_l
+        x2 += diff_w_r
+        if x1 < 0:
+            x2 -= x1
+            x1 -= x1
+        if x2 >= image_width:
+            x2 = image_width
+
+    desired_h = processing_height
+    diff_h = desired_h - (y2 - y1)
+    if diff_h > 0:
+        diff_h_u = diff_h // 2
+        diff_h_d = diff_h - diff_h_u
+        y1 -= diff_h_u
+        y2 += diff_h_d
+        if y1 < 0:
+            y2 -= y1
+            y1 -= y1
+        if y2 >= image_height:
+            y2 = image_height
+
+    if diff_h > 0 or diff_w > 0:
+        print("Crop region was smaller then resolution and has been corrected")
+
+    return x1, y1, x2, y2
+
+
+
 def fill(image, mask):
     """fills masked regions with colors from image using blur. Not extremely effective."""
 

modules/processing.py

@@ -1639,6 +1639,8 @@ class StableDiffusionProcessingImg2Img(StableDiffusionProcessing):
                 crop_region = masking.get_crop_region_v2(mask, self.inpaint_full_res_padding)
                 if crop_region:
                     crop_region = masking.expand_crop_region(crop_region, self.width, self.height, mask.width, mask.height)
+                    if shared.opts.forbid_too_small_crop_region:
+                        crop_region = masking.expand_too_small_crop_region(crop_region, self.width, self.height, mask.width, mask.height)
                     x1, y1, x2, y2 = crop_region
                     mask = mask.crop(crop_region)
                     image_mask = images.resize_image(2, mask, self.width, self.height)

modules/shared_options.py

@@ -227,6 +227,7 @@ options_templates.update(options_section(('img2img', "img2img", "sd"), {
     "return_mask_composite": OptionInfo(False, "For inpainting, include masked composite in results for web"),
     "img2img_batch_show_results_limit": OptionInfo(32, "Show the first N batch img2img results in UI", gr.Slider, {"minimum": -1, "maximum": 1000, "step": 1}).info('0: disable, -1: show all images. Too many images can cause lag'),
     "overlay_inpaint": OptionInfo(True, "Overlay original for inpaint").info("when inpainting, overlay the original image over the areas that weren't inpainted."),
+    "forbid_too_small_crop_region": OptionInfo(False, "Forbid too small crop region").info("Correct inpaint padding for only masked to avoid crop region sides less then processing resolution"),
 }))
 
 options_templates.update(options_section(('optimizations', "Optimizations", "sd"), {