custom_nodes/ComfyUI-IC-Light/nodes.py

import torch
import torchvision.transforms as transforms
import folder_paths
import os
import types
import numpy as np
import torch.nn.functional as F
from comfy.utils import load_torch_file
from .utils.convert_unet import convert_iclight_unet
from .utils.patches import calculate_weight_adjust_channel
from .utils.image import generate_gradient_image, LightPosition
from nodes import MAX_RESOLUTION
from comfy.model_patcher import ModelPatcher
from comfy import lora
import model_management
import logging

class LoadAndApplyICLightUnet:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "model": ("MODEL",),
                "model_path": (folder_paths.get_filename_list("unet"), )
            } 
        }

    RETURN_TYPES = ("MODEL",)
    FUNCTION = "load"
    CATEGORY = "IC-Light"
    DESCRIPTION = """
  
Loads and applies the diffusers SD1.5 IC-Light models available here:  
https://huggingface.co/lllyasviel/ic-light/tree/main  
  
Used with ICLightConditioning -node  
"""

    def load(self, model, model_path):
        type_str = str(type(model.model.model_config).__name__)
        if "SD15" not in type_str:
            raise Exception(f"Attempted to load {type_str} model, IC-Light is only compatible with SD 1.5 models.")

        print("LoadAndApplyICLightUnet: Checking IC-Light Unet path")
        model_full_path = folder_paths.get_full_path("unet", model_path)
        if not os.path.exists(model_full_path):
            raise Exception("Invalid model path")
        else:
            print("LoadAndApplyICLightUnet: Loading IC-Light Unet weights")
            model_clone = model.clone()

            iclight_state_dict = load_torch_file(model_full_path)
            
            print("LoadAndApplyICLightUnet: Attempting to add patches with IC-Light Unet weights")
            try:          
                if 'conv_in.weight' in iclight_state_dict:
                    iclight_state_dict = convert_iclight_unet(iclight_state_dict)
                    in_channels = iclight_state_dict["diffusion_model.input_blocks.0.0.weight"].shape[1]
                    for key in iclight_state_dict:
                        model_clone.add_patches({key: (iclight_state_dict[key],)}, 1.0, 1.0)
                else:
                    for key in iclight_state_dict:
                        model_clone.add_patches({"diffusion_model." + key: (iclight_state_dict[key],)}, 1.0, 1.0)

                    in_channels = iclight_state_dict["input_blocks.0.0.weight"].shape[1]

            except:
                raise Exception("Could not patch model")
            print("LoadAndApplyICLightUnet: Added LoadICLightUnet patches")

            #Patch ComfyUI's LoRA weight application to accept multi-channel inputs. Thanks @huchenlei
            try:
                if hasattr(lora, 'calculate_weight'):
                    lora.calculate_weight = calculate_weight_adjust_channel(lora.calculate_weight)
                else:
                    raise Exception("IC-Light: The 'calculate_weight' function does not exist in 'lora'")
            except Exception as e:
                raise Exception(f"IC-Light: Could not patch calculate_weight - {str(e)}")
            
            # Mimic the existing IP2P class to enable extra_conds
            def bound_extra_conds(self, **kwargs):
                 return ICLight.extra_conds(self, **kwargs)
            new_extra_conds = types.MethodType(bound_extra_conds, model_clone.model)
            model_clone.add_object_patch("extra_conds", new_extra_conds)
            

            model_clone.model.model_config.unet_config["in_channels"] = in_channels        

            return (model_clone, )

import comfy
class ICLight:
    def extra_conds(self, **kwargs):
        out = {}
        
        image = kwargs.get("concat_latent_image", None)
        noise = kwargs.get("noise", None)
        device = kwargs["device"]

        model_in_channels = self.model_config.unet_config['in_channels']
        input_channels = image.shape[1] + 4

        if model_in_channels != input_channels:
            raise Exception(f"Input channels {input_channels} does not match model in_channels {model_in_channels}, 'opt_background' latent input should be used with the IC-Light 'fbc' model, and only with it")
        
        if image is None:
            image = torch.zeros_like(noise)

        if image.shape[1:] != noise.shape[1:]:
            image = comfy.utils.common_upscale(image.to(device), noise.shape[-1], noise.shape[-2], "bilinear", "center")

        image = comfy.utils.resize_to_batch_size(image, noise.shape[0])

        process_image_in = lambda image: image
        out['c_concat'] = comfy.conds.CONDNoiseShape(process_image_in(image))
        
        adm = self.encode_adm(**kwargs)
        if adm is not None:
            out['y'] = comfy.conds.CONDRegular(adm)
        return out

class ICLightConditioning:
    @classmethod
    def INPUT_TYPES(s):
        return {"required": {"positive": ("CONDITIONING", ),
                             "negative": ("CONDITIONING", ),
                             "vae": ("VAE", ),
                             "foreground": ("LATENT", ),
                             "multiplier": ("FLOAT", {"default": 0.18215, "min": 0.0, "max": 1.0, "step": 0.001}),
                             },
                "optional": {
                     "opt_background": ("LATENT", ),
                     },
                }

    RETURN_TYPES = ("CONDITIONING","CONDITIONING","LATENT")
    RETURN_NAMES = ("positive", "negative", "empty_latent")
    FUNCTION = "encode"
    CATEGORY = "IC-Light"
    DESCRIPTION = """
  
Conditioning for the IC-Light model.  
To use the "opt_background" input, you also need to use the  
"fbc" version of the IC-Light models.  
  
"""

    def encode(self, positive, negative, vae, foreground, multiplier, opt_background=None):
        samples_1 = foreground["samples"]

        if opt_background is not None:
            samples_2 = opt_background["samples"]

            repeats_1 = samples_2.size(0) // samples_1.size(0)
            repeats_2 = samples_1.size(0) // samples_2.size(0)
            if samples_1.shape[1:] != samples_2.shape[1:]:
                samples_2 = comfy.utils.common_upscale(samples_2, samples_1.shape[-1], samples_1.shape[-2], "bilinear", "disabled")

            # Repeat the tensors to match the larger batch size
            if repeats_1 > 1:
                samples_1 = samples_1.repeat(repeats_1, 1, 1, 1)
            if repeats_2 > 1:
                samples_2 = samples_2.repeat(repeats_2, 1, 1, 1)

            concat_latent = torch.cat((samples_1, samples_2), dim=1)
        else:
            concat_latent = samples_1

        out_latent = torch.zeros_like(samples_1)

        out = []
        for conditioning in [positive, negative]:
            c = []
            for t in conditioning:
                d = t[1].copy()
                d["concat_latent_image"] = concat_latent * multiplier
                n = [t[0], d]
                c.append(n)
            out.append(c)
        return (out[0], out[1], {"samples": out_latent})

class LightSource:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "light_position": ([member.value for member in LightPosition],),
                "multiplier": ("FLOAT", {"default": 1.0, "min": 0.0, "max": 100.0, "step": 0.001}),
                "start_color": ("STRING", {"default": "#FFFFFF"}),
                "end_color": ("STRING", {"default": "#000000"}),
                "width": ("INT", { "default": 512, "min": 0, "max": MAX_RESOLUTION, "step": 8, }),
                "height": ("INT", { "default": 512, "min": 0, "max": MAX_RESOLUTION, "step": 8, }),
                },
            "optional": {
                "batch_size": ("INT", { "default": 1, "min": 1, "max": 4096, "step": 1, }),
                "prev_image": ("IMAGE",),
                } 
        }
    
    RETURN_TYPES = ("IMAGE",)
    RETURN_NAMES = ("IMAGE",)
    FUNCTION = "execute"
    CATEGORY = "IC-Light"
    DESCRIPTION = """
Generates a gradient image that can be used  
as a simple light source.  The color can be  
specified in RGB or hex format.  
"""

    def execute(self, light_position, multiplier, start_color, end_color, width, height, batch_size=1, prev_image=None):
        def toRgb(color):
            if color.startswith('#') and len(color) == 7:  # e.g. "#RRGGBB"
                color_rgb =tuple(int(color[i:i+2], 16) for i in (1, 3, 5))
            else:  # e.g. "255,255,255"
                color_rgb = tuple(int(i) for i in color.split(','))
            return color_rgb
        lightPosition = LightPosition(light_position)
        start_color_rgb = toRgb(start_color)
        end_color_rgb = toRgb(end_color)
        image = generate_gradient_image(width, height, start_color_rgb, end_color_rgb, multiplier, lightPosition)
        
        image = image.astype(np.float32) / 255.0
        image = torch.from_numpy(image)[None,]
        image = image.repeat(batch_size, 1, 1, 1)
        if prev_image is not None:
            image = torch.cat((prev_image, image), dim=0)
        return (image,)

class CalculateNormalsFromImages:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "images": ("IMAGE",),
                "sigma": ("FLOAT", { "default": 10.0, "min": 0.01, "max": 100.0, "step": 0.01, }),
                "center_input_range": ("BOOLEAN", { "default": False, }),
            },
            "optional": {
                "mask": ("MASK",),
            }
        }
    
    RETURN_TYPES = ("IMAGE", "IMAGE",)
    RETURN_NAMES = ("normal", "divided",)
    FUNCTION = "execute"
    CATEGORY = "IC-Light"
    DESCRIPTION = """
Calculates normal map from different directional exposures.  
Takes in 4 images as a batch:  
left, right, bottom, top  

"""

    def execute(self, images, sigma, center_input_range, mask=None):
        B, H, W, C = images.shape
        repetitions = B // 4        

        if center_input_range:
            images = images * 0.5 + 0.5
        if mask is not None:
            if mask.shape[-2:] != images[0].shape[:-1]:
                mask = mask.unsqueeze(0)
                mask = F.interpolate(mask, size=(images.shape[1], images.shape[2]), mode="bilinear")
                mask = mask.squeeze(0)
        

        
        normal_list = []
        divided_list = []
        iteration_counter = 0

        for i in range(0, B, 4):  # Loop over every 4 images
            index = torch.arange(iteration_counter, B, repetitions)
            rearranged_images = images[index]
            images_np = rearranged_images.numpy().astype(np.float32)
            
            left = images_np[0]
            right = images_np[1]
            bottom = images_np[2]
            top = images_np[3]

            ambient = (left + right + bottom + top) / 4.0
        
            def safe_divide(a, b):
                e = 1e-5
                return ((a + e) / (b + e)) - 1.0

            left = safe_divide(left, ambient)
            right = safe_divide(right, ambient)
            bottom = safe_divide(bottom, ambient)
            top = safe_divide(top, ambient)

            u = (right - left) * 0.5
            v = (top - bottom) * 0.5

            u = np.mean(u, axis=2)
            v = np.mean(v, axis=2)
            h = (1.0 - u ** 2.0 - v ** 2.0).clip(0, 1e5) ** (0.5 * sigma)
            z = np.zeros_like(h)

            normal = np.stack([u, v, h], axis=2)
            normal /= np.sum(normal ** 2.0, axis=2, keepdims=True) ** 0.5
            if mask is not None:
                matting = mask[iteration_counter].unsqueeze(0).numpy().astype(np.float32)
                matting = matting[..., np.newaxis]
                normal = normal * matting + np.stack([z, z, 1 - z], axis=2) 
                normal = torch.from_numpy(normal)
                #normal = normal.unsqueeze(0)
            else:
                normal = normal + np.stack([z, z, 1 - z], axis=2)
                normal = torch.from_numpy(normal).unsqueeze(0)

            iteration_counter += 1 
            normal = (normal - normal.min()) / ((normal.max() - normal.min()))
            normal_list.append(normal)
            divided = np.stack([left, right, bottom, top])
            divided = torch.from_numpy(divided)
            divided = (divided - divided.min()) / ((divided.max() - divided.min()))
            divided = torch.max(divided, dim=3, keepdim=True)[0].repeat(1, 1, 1, 3)
            divided_list.append(divided)

        normal_out = torch.cat(normal_list, dim=0)
        divided_out = torch.cat(divided_list, dim=0)
   
        return (normal_out, divided_out, )

class LoadHDRImage:
    @classmethod
    def INPUT_TYPES(s):
        input_dir = folder_paths.get_input_directory()
        files = [f for f in os.listdir(input_dir) if os.path.isfile(os.path.join(input_dir, f))]
        return {"required":
                    {"image": (sorted(files), {"image_upload": False}),
                     "exposures": ("STRING", {"default": "-2,-1,0,1,2"}),
                     },
                }

    CATEGORY = "IC-Light"
    RETURN_TYPES = ("IMAGE", "MASK")
    FUNCTION = "loadhdrimage"
    DESCRIPTION = """
Loads a .hdr image from the input directory.  
Output is a batch of LDR images with the selected exposures.  

"""
    def loadhdrimage(self, image, exposures):
        import cv2
        image_path = folder_paths.get_annotated_filepath(image)
        # Load the HDR image
        hdr_image = cv2.imread(image_path, cv2.IMREAD_ANYDEPTH)

        exposures = list(map(int, exposures.split(",")))
        if not isinstance(exposures, list):
            exposures = [exposures]  # Example exposure values
        ldr_images_tensors = []

        for exposure in exposures:
            # Scale pixel values to simulate different exposures
            ldr_image = np.clip(hdr_image * (2**exposure), 0, 1)
            # Convert to 8-bit image (LDR) by scaling to 255
            ldr_image_8bit = np.uint8(ldr_image * 255)
            # Convert BGR to RGB
            ldr_image_8bit = cv2.cvtColor(ldr_image_8bit, cv2.COLOR_BGR2RGB)
            # Convert the LDR image to a torch tensor
            tensor_image = torch.from_numpy(ldr_image_8bit).float()
            # Normalize the tensor to the range [0, 1]
            tensor_image = tensor_image / 255.0
            # Change the tensor shape to (C, H, W)
            tensor_image = tensor_image.permute(2, 0, 1)
            # Add the tensor to the list
            ldr_images_tensors.append(tensor_image)

        batch_tensors = torch.stack(ldr_images_tensors)
        batch_tensors = batch_tensors.permute(0, 2, 3, 1)

        return batch_tensors,

class BackgroundScaler:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "image": ("IMAGE",),
                "mask": ("MASK",),
                "scale": ("FLOAT", {"default": 0.5, "min": -10.0, "max": 10.0, "step": 0.001}),
                "invert": ("BOOLEAN", { "default": False, }),
            }
        }

    CATEGORY = "IC-Light"
    RETURN_TYPES = ("IMAGE",)
    FUNCTION = "apply"
    DESCRIPTION = """
Sets the masked area color in grayscale range.  
"""

    def apply(self, image: torch.Tensor, mask: torch.Tensor, scale: float, invert: bool):

        # Validate inputs
        if not isinstance(image, torch.Tensor) or not isinstance(mask, torch.Tensor):
            raise ValueError("image and mask must be torch.Tensor types.")
        if image.ndim != 4 or mask.ndim not in [3, 4]:
            raise ValueError("image must be a 4D tensor, and mask must be a 3D or 4D tensor.")

        # Adjust mask dimensions if necessary
        if mask.ndim == 3:
            # [B, H, W] => [B, H, W, C=1]
            mask = mask.unsqueeze(-1)

        if invert:
            mask = 1 - mask
        image_out = image * mask + (1 - mask) * scale
        image_out = torch.clamp(image_out, 0, 1).cpu().float()
        
        return (image_out,)

class DetailTransfer:
    @classmethod
    def INPUT_TYPES(s):
        return {
            "required": {
                "target": ("IMAGE", ),
                "source": ("IMAGE", ),
                "mode": ([
                    "add",
                    "multiply",
                    "screen",
                    "overlay",
                    "soft_light",
                    "hard_light",
                    "color_dodge",
                    "color_burn",
                    "difference",
                    "exclusion",
                    "divide",
                    
                    ], 
                    {"default": "add"}
                    ),
                "blur_sigma": ("FLOAT", {"default": 1.0, "min": 0.1, "max": 100.0, "step": 0.01}),
                "blend_factor": ("FLOAT", {"default": 1.0, "min": -10.0, "max": 10.0, "step": 0.001,  "round": 0.001}),
            },
            "optional": {
                "mask": ("MASK", ),
            }
        }

    RETURN_TYPES = ("IMAGE",)
    FUNCTION = "process"
    CATEGORY = "IC-Light"

    def adjust_mask(self, mask, target_tensor):
        # Add a channel dimension and repeat to match the channel number of the target tensor
        if len(mask.shape) == 3:
            mask = mask.unsqueeze(1)  # Add a channel dimension
            target_channels = target_tensor.shape[1]
            mask = mask.expand(-1, target_channels, -1, -1)  # Expand the channel dimension to match the target tensor's channels
    
        return mask


    def process(self, target, source, mode, blur_sigma, blend_factor, mask=None):
        B, H, W, C = target.shape
        device = model_management.get_torch_device()
        target_tensor = target.permute(0, 3, 1, 2).clone().to(device)
        source_tensor = source.permute(0, 3, 1, 2).clone().to(device)

        if target.shape[1:] != source.shape[1:]:
            source_tensor = comfy.utils.common_upscale(source_tensor, W, H, "bilinear", "disabled")

        if source.shape[0] < B:
            source = source[0].unsqueeze(0).repeat(B, 1, 1, 1)

        kernel_size = int(6 * int(blur_sigma) + 1)

        gaussian_blur = transforms.GaussianBlur(kernel_size=(kernel_size, kernel_size), sigma=(blur_sigma, blur_sigma))

        blurred_target = gaussian_blur(target_tensor)
        blurred_source = gaussian_blur(source_tensor)
        
        if mode == "add":
            tensor_out = (source_tensor - blurred_source) + blurred_target
        elif mode == "multiply":
            tensor_out = source_tensor * blurred_target
        elif mode == "screen":
            tensor_out = 1 - (1 - source_tensor) * (1 - blurred_target)
        elif mode == "overlay":
            tensor_out = torch.where(blurred_target < 0.5, 2 * source_tensor * blurred_target, 1 - 2 * (1 - source_tensor) * (1 - blurred_target))
        elif mode == "soft_light":
            tensor_out = (1 - 2 * blurred_target) * source_tensor**2 + 2 * blurred_target * source_tensor
        elif mode == "hard_light":
            tensor_out = torch.where(source_tensor < 0.5, 2 * source_tensor * blurred_target, 1 - 2 * (1 - source_tensor) * (1 - blurred_target))
        elif mode == "difference":
            tensor_out = torch.abs(blurred_target - source_tensor)
        elif mode == "exclusion":
            tensor_out = 0.5 - 2 * (blurred_target - 0.5) * (source_tensor - 0.5)
        elif mode == "color_dodge":
            tensor_out = blurred_target / (1 - source_tensor)
        elif mode == "color_burn":
            tensor_out = 1 - (1 - blurred_target) / source_tensor
        elif mode == "divide":
            tensor_out = (source_tensor / blurred_source) * blurred_target
        else:
            tensor_out = source_tensor
        
        tensor_out = torch.lerp(target_tensor, tensor_out, blend_factor)
        if mask is not None:
            # Call the function and pass in mask and target_tensor
            mask = self.adjust_mask(mask, target_tensor)
            mask = mask.to(device)
            tensor_out = torch.lerp(target_tensor, tensor_out, mask)
        tensor_out = torch.clamp(tensor_out, 0, 1)
        tensor_out = tensor_out.permute(0, 2, 3, 1).cpu().float()
        return (tensor_out,)
    
            
NODE_CLASS_MAPPINGS = {
    "LoadAndApplyICLightUnet": LoadAndApplyICLightUnet,
    "ICLightConditioning": ICLightConditioning,
    "LightSource": LightSource,
    "CalculateNormalsFromImages": CalculateNormalsFromImages,
    "LoadHDRImage": LoadHDRImage,
    "BackgroundScaler": BackgroundScaler,
    "DetailTransfer": DetailTransfer
}
NODE_DISPLAY_NAME_MAPPINGS = {
    "LoadAndApplyICLightUnet": "Load And Apply IC-Light",
    "ICLightConditioning": "IC-Light Conditioning",
    "LightSource": "Simple Light Source",
    "CalculateNormalsFromImages": "Calculate Normals From Images",
    "LoadHDRImage": "Load HDR Image",
    "BackgroundScaler": "Background Scaler",
    "DetailTransfer": "Detail Transfer"
}