feat: 🚀 add optional inputs to colored image

nodes/image_processing.py

@@ -354,7 +354,11 @@ def INPUT_TYPES(cls):
                 "color": ("COLOR",),
                 "width": ("INT", {"default": 512, "min": 16, "max": 8160}),
                 "height": ("INT", {"default": 512, "min": 16, "max": 8160}),
-            }
+            },
+            "optional": {
+                "foreground_image": ("IMAGE",),
+                "foreground_mask": ("MASK",),
+            },
         }
 
     CATEGORY = "mtb/generate"
@@ -363,12 +367,46 @@ def INPUT_TYPES(cls):
 
     FUNCTION = "render_img"
 
-    def render_img(self, color, width, height):
-        image = Image.new("RGB", (width, height), color=color)
+    def render_img(
+        self, color, width, height, foreground_image=None, foreground_mask=None
+    ):
+        image = Image.new("RGBA", (width, height), color=color)
+        output = []
+        if foreground_image is not None:
+            if foreground_mask is None:
+                fg_images = tensor2pil(foreground_image)
+                for img in fg_images:
+                    if image.size != img.size:
+                        raise ValueError(
+                            f"Dimension mismatch: image {image.size}, img {img.size}"
+                        )
+
+                    if img.mode != "RGBA":
+                        raise ValueError(
+                            f"Foreground image must be in 'RGBA' mode when no mask is provided, got {img.mode}"
+                        )
+
+                    output.append(Image.alpha_composite(image, img).convert("RGB"))
+
+            elif foreground_image.size[0] != foreground_mask.size[0]:
+                raise ValueError("Foreground image and mask must have same batch size")
+            else:
+                fg_images = tensor2pil(foreground_image)
+                fg_masks = tensor2pil(foreground_mask)
+                output.extend(
+                    Image.composite(
+                        fg_image.convert("RGBA"),
+                        image,
+                        fg_mask,
+                    ).convert("RGB")
+                    for fg_image, fg_mask in zip(fg_images, fg_masks)
+                )
+        elif foreground_mask is not None:
+            log.warn("Mask ignored because no foreground image is given")
 
-        image = pil2tensor(image)
+        output = pil2tensor(output)
 
-        return (image,)
+        return (output,)
 
 
 class ImagePremultiply: