diffusion/pipelines/image_processor.py

# Copyright 2024 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import math
import warnings
from typing import List, Optional, Tuple, Union

import numpy as np
import PIL.Image
import torch
import torch.nn.functional as F
import torchvision.transforms as T
from PIL import Image, ImageFilter, ImageOps

from diffusers.configuration_utils import ConfigMixin, register_to_config
from diffusers.utils import CONFIG_NAME, PIL_INTERPOLATION, deprecate

from onediffusion.dataset.transforms import CenterCropResizeImage

PipelineImageInput = Union[
    PIL.Image.Image,
    np.ndarray,
    torch.Tensor,
    List[PIL.Image.Image],
    List[np.ndarray],
    List[torch.Tensor],
]

PipelineDepthInput = PipelineImageInput


def is_valid_image(image):
    return isinstance(image, PIL.Image.Image) or isinstance(image, (np.ndarray, torch.Tensor)) and image.ndim in (2, 3)


def is_valid_image_imagelist(images):
    # check if the image input is one of the supported formats for image and image list:
    # it can be either one of below 3
    # (1) a 4d pytorch tensor or numpy array,
    # (2) a valid image: PIL.Image.Image, 2-d np.ndarray or torch.Tensor (grayscale image), 3-d np.ndarray or torch.Tensor
    # (3) a list of valid image
    if isinstance(images, (np.ndarray, torch.Tensor)) and images.ndim == 4:
        return True
    elif is_valid_image(images):
        return True
    elif isinstance(images, list):
        return all(is_valid_image(image) for image in images)
    return False


class VaeImageProcessorOneDiffuser(ConfigMixin):
    """
    Image processor for VAE.

    Args:
        do_resize (`bool`, *optional*, defaults to `True`):
            Whether to downscale the image's (height, width) dimensions to multiples of `vae_scale_factor`. Can accept
            `height` and `width` arguments from [`image_processor.VaeImageProcessor.preprocess`] method.
        vae_scale_factor (`int`, *optional*, defaults to `8`):
            VAE scale factor. If `do_resize` is `True`, the image is automatically resized to multiples of this factor.
        resample (`str`, *optional*, defaults to `lanczos`):
            Resampling filter to use when resizing the image.
        do_normalize (`bool`, *optional*, defaults to `True`):
            Whether to normalize the image to [-1,1].
        do_binarize (`bool`, *optional*, defaults to `False`):
            Whether to binarize the image to 0/1.
        do_convert_rgb (`bool`, *optional*, defaults to be `False`):
            Whether to convert the images to RGB format.
        do_convert_grayscale (`bool`, *optional*, defaults to be `False`):
            Whether to convert the images to grayscale format.
    """

    config_name = CONFIG_NAME

    @register_to_config
    def __init__(
        self,
        do_resize: bool = True,
        vae_scale_factor: int = 8,
        vae_latent_channels: int = 4,
        resample: str = "lanczos",
        do_normalize: bool = True,
        do_binarize: bool = False,
        do_convert_rgb: bool = False,
        do_convert_grayscale: bool = False,
    ):
        super().__init__()
        if do_convert_rgb and do_convert_grayscale:
            raise ValueError(
                "`do_convert_rgb` and `do_convert_grayscale` can not both be set to `True`,"
                " if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`.",
                " if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`",
            )

    @staticmethod
    def numpy_to_pil(images: np.ndarray) -> List[PIL.Image.Image]:
        """
        Convert a numpy image or a batch of images to a PIL image.
        """
        if images.ndim == 3:
            images = images[None, ...]
        images = (images * 255).round().astype("uint8")
        if images.shape[-1] == 1:
            # special case for grayscale (single channel) images
            pil_images = [Image.fromarray(image.squeeze(), mode="L") for image in images]
        else:
            pil_images = [Image.fromarray(image) for image in images]

        return pil_images

    @staticmethod
    def pil_to_numpy(images: Union[List[PIL.Image.Image], PIL.Image.Image]) -> np.ndarray:
        """
        Convert a PIL image or a list of PIL images to NumPy arrays.
        """
        if not isinstance(images, list):
            images = [images]
        images = [np.array(image).astype(np.float32) / 255.0 for image in images]
        images = np.stack(images, axis=0)

        return images

    @staticmethod
    def numpy_to_pt(images: np.ndarray) -> torch.Tensor:
        """
        Convert a NumPy image to a PyTorch tensor.
        """
        if images.ndim == 3:
            images = images[..., None]

        images = torch.from_numpy(images.transpose(0, 3, 1, 2))
        return images

    @staticmethod
    def pt_to_numpy(images: torch.Tensor) -> np.ndarray:
        """
        Convert a PyTorch tensor to a NumPy image.
        """
        images = images.cpu().permute(0, 2, 3, 1).float().numpy()
        return images

    @staticmethod
    def normalize(images: Union[np.ndarray, torch.Tensor]) -> Union[np.ndarray, torch.Tensor]:
        """
        Normalize an image array to [-1,1].
        """
        return 2.0 * images - 1.0

    @staticmethod
    def denormalize(images: Union[np.ndarray, torch.Tensor]) -> Union[np.ndarray, torch.Tensor]:
        """
        Denormalize an image array to [0,1].
        """
        return (images / 2 + 0.5).clamp(0, 1)

    @staticmethod
    def convert_to_rgb(image: PIL.Image.Image) -> PIL.Image.Image:
        """
        Converts a PIL image to RGB format.
        """
        image = image.convert("RGB")

        return image

    @staticmethod
    def convert_to_grayscale(image: PIL.Image.Image) -> PIL.Image.Image:
        """
        Converts a PIL image to grayscale format.
        """
        image = image.convert("L")

        return image

    @staticmethod
    def blur(image: PIL.Image.Image, blur_factor: int = 4) -> PIL.Image.Image:
        """
        Applies Gaussian blur to an image.
        """
        image = image.filter(ImageFilter.GaussianBlur(blur_factor))

        return image

    @staticmethod
    def get_crop_region(mask_image: PIL.Image.Image, width: int, height: int, pad=0):
        """
        Finds a rectangular region that contains all masked ares in an image, and expands region to match the aspect
        ratio of the original image; for example, if user drew mask in a 128x32 region, and the dimensions for
        processing are 512x512, the region will be expanded to 128x128.

        Args:
            mask_image (PIL.Image.Image): Mask image.
            width (int): Width of the image to be processed.
            height (int): Height of the image to be processed.
            pad (int, optional): Padding to be added to the crop region. Defaults to 0.

        Returns:
            tuple: (x1, y1, x2, y2) represent a rectangular region that contains all masked ares in an image and
            matches the original aspect ratio.
        """

        mask_image = mask_image.convert("L")
        mask = np.array(mask_image)

        # 1. find a rectangular region that contains all masked ares in an image
        h, w = mask.shape
        crop_left = 0
        for i in range(w):
            if not (mask[:, i] == 0).all():
                break
            crop_left += 1

        crop_right = 0
        for i in reversed(range(w)):
            if not (mask[:, i] == 0).all():
                break
            crop_right += 1

        crop_top = 0
        for i in range(h):
            if not (mask[i] == 0).all():
                break
            crop_top += 1

        crop_bottom = 0
        for i in reversed(range(h)):
            if not (mask[i] == 0).all():
                break
            crop_bottom += 1

        # 2. add padding to the crop region
        x1, y1, x2, y2 = (
            int(max(crop_left - pad, 0)),
            int(max(crop_top - pad, 0)),
            int(min(w - crop_right + pad, w)),
            int(min(h - crop_bottom + pad, h)),
        )

        # 3. expands crop region to match the aspect ratio of the image to be processed
        ratio_crop_region = (x2 - x1) / (y2 - y1)
        ratio_processing = width / height

        if ratio_crop_region > ratio_processing:
            desired_height = (x2 - x1) / ratio_processing
            desired_height_diff = int(desired_height - (y2 - y1))
            y1 -= desired_height_diff // 2
            y2 += desired_height_diff - desired_height_diff // 2
            if y2 >= mask_image.height:
                diff = y2 - mask_image.height
                y2 -= diff
                y1 -= diff
            if y1 < 0:
                y2 -= y1
                y1 -= y1
            if y2 >= mask_image.height:
                y2 = mask_image.height
        else:
            desired_width = (y2 - y1) * ratio_processing
            desired_width_diff = int(desired_width - (x2 - x1))
            x1 -= desired_width_diff // 2
            x2 += desired_width_diff - desired_width_diff // 2
            if x2 >= mask_image.width:
                diff = x2 - mask_image.width
                x2 -= diff
                x1 -= diff
            if x1 < 0:
                x2 -= x1
                x1 -= x1
            if x2 >= mask_image.width:
                x2 = mask_image.width

        return x1, y1, x2, y2

    def _resize_and_fill(
        self,
        image: PIL.Image.Image,
        width: int,
        height: int,
    ) -> PIL.Image.Image:
        """
        Resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center
        the image within the dimensions, filling empty with data from image.

        Args:
            image: The image to resize.
            width: The width to resize the image to.
            height: The height to resize the image to.
        """

        ratio = width / height
        src_ratio = image.width / image.height

        src_w = width if ratio < src_ratio else image.width * height // image.height
        src_h = height if ratio >= src_ratio else image.height * width // image.width

        resized = image.resize((src_w, src_h), resample=PIL_INTERPOLATION["lanczos"])
        res = Image.new("RGB", (width, height))
        res.paste(resized, box=(width // 2 - src_w // 2, height // 2 - src_h // 2))

        if ratio < src_ratio:
            fill_height = height // 2 - src_h // 2
            if fill_height > 0:
                res.paste(resized.resize((width, fill_height), box=(0, 0, width, 0)), box=(0, 0))
                res.paste(
                    resized.resize((width, fill_height), box=(0, resized.height, width, resized.height)),
                    box=(0, fill_height + src_h),
                )
        elif ratio > src_ratio:
            fill_width = width // 2 - src_w // 2
            if fill_width > 0:
                res.paste(resized.resize((fill_width, height), box=(0, 0, 0, height)), box=(0, 0))
                res.paste(
                    resized.resize((fill_width, height), box=(resized.width, 0, resized.width, height)),
                    box=(fill_width + src_w, 0),
                )

        return res

    def _resize_and_crop(
        self,
        image: PIL.Image.Image,
        width: int,
        height: int,
    ) -> PIL.Image.Image:
        """
        Resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center
        the image within the dimensions, cropping the excess.

        Args:
            image: The image to resize.
            width: The width to resize the image to.
            height: The height to resize the image to.
        """
        ratio = width / height
        src_ratio = image.width / image.height

        src_w = width if ratio > src_ratio else image.width * height // image.height
        src_h = height if ratio <= src_ratio else image.height * width // image.width

        resized = image.resize((src_w, src_h), resample=PIL_INTERPOLATION["lanczos"])
        res = Image.new("RGB", (width, height))
        res.paste(resized, box=(width // 2 - src_w // 2, height // 2 - src_h // 2))
        return res

    def resize(
        self,
        image: Union[PIL.Image.Image, np.ndarray, torch.Tensor],
        height: int,
        width: int,
        resize_mode: str = "default",  # "default", "fill", "crop"
    ) -> Union[PIL.Image.Image, np.ndarray, torch.Tensor]:
        """
        Resize image.

        Args:
            image (`PIL.Image.Image`, `np.ndarray` or `torch.Tensor`):
                The image input, can be a PIL image, numpy array or pytorch tensor.
            height (`int`):
                The height to resize to.
            width (`int`):
                The width to resize to.
            resize_mode (`str`, *optional*, defaults to `default`):
                The resize mode to use, can be one of `default` or `fill`. If `default`, will resize the image to fit
                within the specified width and height, and it may not maintaining the original aspect ratio. If `fill`,
                will resize the image to fit within the specified width and height, maintaining the aspect ratio, and
                then center the image within the dimensions, filling empty with data from image. If `crop`, will resize
                the image to fit within the specified width and height, maintaining the aspect ratio, and then center
                the image within the dimensions, cropping the excess. Note that resize_mode `fill` and `crop` are only
                supported for PIL image input.

        Returns:
            `PIL.Image.Image`, `np.ndarray` or `torch.Tensor`:
                The resized image.
        """
        if resize_mode != "default" and not isinstance(image, PIL.Image.Image):
            raise ValueError(f"Only PIL image input is supported for resize_mode {resize_mode}")
        if isinstance(image, PIL.Image.Image):
            if resize_mode == "default":
                image = image.resize((width, height), resample=PIL_INTERPOLATION[self.config.resample])
            elif resize_mode == "fill":
                image = self._resize_and_fill(image, width, height)
            elif resize_mode == "crop":
                image = self._resize_and_crop(image, width, height)
            else:
                raise ValueError(f"resize_mode {resize_mode} is not supported")

        elif isinstance(image, torch.Tensor):
            image = torch.nn.functional.interpolate(
                image,
                size=(height, width),
            )
        elif isinstance(image, np.ndarray):
            image = self.numpy_to_pt(image)
            image = torch.nn.functional.interpolate(
                image,
                size=(height, width),
            )
            image = self.pt_to_numpy(image)
        return image

    def binarize(self, image: PIL.Image.Image) -> PIL.Image.Image:
        """
        Create a mask.

        Args:
            image (`PIL.Image.Image`):
                The image input, should be a PIL image.

        Returns:
            `PIL.Image.Image`:
                The binarized image. Values less than 0.5 are set to 0, values greater than 0.5 are set to 1.
        """
        image[image < 0.5] = 0
        image[image >= 0.5] = 1

        return image

    def get_default_height_width(
        self,
        image: Union[PIL.Image.Image, np.ndarray, torch.Tensor],
        height: Optional[int] = None,
        width: Optional[int] = None,
    ) -> Tuple[int, int]:
        """
        This function return the height and width that are downscaled to the next integer multiple of
        `vae_scale_factor`.

        Args:
            image(`PIL.Image.Image`, `np.ndarray` or `torch.Tensor`):
                The image input, can be a PIL image, numpy array or pytorch tensor. if it is a numpy array, should have
                shape `[batch, height, width]` or `[batch, height, width, channel]` if it is a pytorch tensor, should
                have shape `[batch, channel, height, width]`.
            height (`int`, *optional*, defaults to `None`):
                The height in preprocessed image. If `None`, will use the height of `image` input.
            width (`int`, *optional*`, defaults to `None`):
                The width in preprocessed. If `None`, will use the width of the `image` input.
        """

        if height is None:
            if isinstance(image, PIL.Image.Image):
                height = image.height
            elif isinstance(image, torch.Tensor):
                height = image.shape[2]
            else:
                height = image.shape[1]

        if width is None:
            if isinstance(image, PIL.Image.Image):
                width = image.width
            elif isinstance(image, torch.Tensor):
                width = image.shape[3]
            else:
                width = image.shape[2]

        width, height = (
            x - x % self.config.vae_scale_factor for x in (width, height)
        )  # resize to integer multiple of vae_scale_factor

        return height, width

    def preprocess(
        self,
        image: PipelineImageInput,
        height: Optional[int] = None,
        width: Optional[int] = None,
        resize_mode: str = "default",  # "default", "fill", "crop"
        crops_coords: Optional[Tuple[int, int, int, int]] = None,
        do_crop: bool = True,
    ) -> torch.Tensor:
        """
        Preprocess the image input.

        Args:
            image (`pipeline_image_input`):
                The image input, accepted formats are PIL images, NumPy arrays, PyTorch tensors; Also accept list of
                supported formats.
            height (`int`, *optional*, defaults to `None`):
                The height in preprocessed image. If `None`, will use the `get_default_height_width()` to get default
                height.
            width (`int`, *optional*`, defaults to `None`):
                The width in preprocessed. If `None`, will use get_default_height_width()` to get the default width.
            resize_mode (`str`, *optional*, defaults to `default`):
                The resize mode, can be one of `default` or `fill`. If `default`, will resize the image to fit within
                the specified width and height, and it may not maintaining the original aspect ratio. If `fill`, will
                resize the image to fit within the specified width and height, maintaining the aspect ratio, and then
                center the image within the dimensions, filling empty with data from image. If `crop`, will resize the
                image to fit within the specified width and height, maintaining the aspect ratio, and then center the
                image within the dimensions, cropping the excess. Note that resize_mode `fill` and `crop` are only
                supported for PIL image input.
            crops_coords (`List[Tuple[int, int, int, int]]`, *optional*, defaults to `None`):
                The crop coordinates for each image in the batch. If `None`, will not crop the image.
        """
        supported_formats = (PIL.Image.Image, np.ndarray, torch.Tensor)

        # Expand the missing dimension for 3-dimensional pytorch tensor or numpy array that represents grayscale image
        if self.config.do_convert_grayscale and isinstance(image, (torch.Tensor, np.ndarray)) and image.ndim == 3:
            if isinstance(image, torch.Tensor):
                # if image is a pytorch tensor could have 2 possible shapes:
                #    1. batch x height x width: we should insert the channel dimension at position 1
                #    2. channel x height x width: we should insert batch dimension at position 0,
                #       however, since both channel and batch dimension has same size 1, it is same to insert at position 1
                #    for simplicity, we insert a dimension of size 1 at position 1 for both cases
                image = image.unsqueeze(1)
            else:
                # if it is a numpy array, it could have 2 possible shapes:
                #   1. batch x height x width: insert channel dimension on last position
                #   2. height x width x channel: insert batch dimension on first position
                if image.shape[-1] == 1:
                    image = np.expand_dims(image, axis=0)
                else:
                    image = np.expand_dims(image, axis=-1)

        if isinstance(image, list) and isinstance(image[0], np.ndarray) and image[0].ndim == 4:
            warnings.warn(
                "Passing `image` as a list of 4d np.ndarray is deprecated."
                "Please concatenate the list along the batch dimension and pass it as a single 4d np.ndarray",
                FutureWarning,
            )
            image = np.concatenate(image, axis=0)
        if isinstance(image, list) and isinstance(image[0], torch.Tensor) and image[0].ndim == 4:
            warnings.warn(
                "Passing `image` as a list of 4d torch.Tensor is deprecated."
                "Please concatenate the list along the batch dimension and pass it as a single 4d torch.Tensor",
                FutureWarning,
            )
            image = torch.cat(image, axis=0)

        if not is_valid_image_imagelist(image):
            raise ValueError(
                f"Input is in incorrect format. Currently, we only support {', '.join(str(x) for x in supported_formats)}"
            )
        if not isinstance(image, list):
            image = [image]

        if isinstance(image[0], PIL.Image.Image):
            pass
        elif isinstance(image[0], np.ndarray):
            image = self.numpy_to_pil(image)
        elif isinstance(image[0], torch.Tensor):
            image = self.pt_to_numpy(image)
            image = self.numpy_to_pil(image)

        if do_crop:
            transforms = T.Compose([
                T.Lambda(lambda image: image.convert('RGB')),
                T.ToTensor(),
                CenterCropResizeImage((height, width)),
                T.Normalize([.5], [.5]),
            ])
        else:
            transforms = T.Compose([
                T.Lambda(lambda image: image.convert('RGB')),
                T.ToTensor(),
                T.Resize((height, width)),
                T.Normalize([.5], [.5]),
            ])
        image = torch.stack([transforms(i) for i in image])

        # expected range [0,1], normalize to [-1,1]
        do_normalize = self.config.do_normalize
        if do_normalize and image.min() < 0:
            warnings.warn(
                "Passing `image` as torch tensor with value range in [-1,1] is deprecated. The expected value range for image tensor is [0,1] "
                f"when passing as pytorch tensor or numpy Array. You passed `image` with value range [{image.min()},{image.max()}]",
                FutureWarning,
            )
            do_normalize = False
        if do_normalize:
            image = self.normalize(image)

        if self.config.do_binarize:
            image = self.binarize(image)

        return image

    def postprocess(
        self,
        image: torch.Tensor,
        output_type: str = "pil",
        do_denormalize: Optional[List[bool]] = None,
    ) -> Union[PIL.Image.Image, np.ndarray, torch.Tensor]:
        """
        Postprocess the image output from tensor to `output_type`.

        Args:
            image (`torch.Tensor`):
                The image input, should be a pytorch tensor with shape `B x C x H x W`.
            output_type (`str`, *optional*, defaults to `pil`):
                The output type of the image, can be one of `pil`, `np`, `pt`, `latent`.
            do_denormalize (`List[bool]`, *optional*, defaults to `None`):
                Whether to denormalize the image to [0,1]. If `None`, will use the value of `do_normalize` in the
                `VaeImageProcessor` config.

        Returns:
            `PIL.Image.Image`, `np.ndarray` or `torch.Tensor`:
                The postprocessed image.
        """
        if not isinstance(image, torch.Tensor):
            raise ValueError(
                f"Input for postprocessing is in incorrect format: {type(image)}. We only support pytorch tensor"
            )
        if output_type not in ["latent", "pt", "np", "pil"]:
            deprecation_message = (
                f"the output_type {output_type} is outdated and has been set to `np`. Please make sure to set it to one of these instead: "
                "`pil`, `np`, `pt`, `latent`"
            )
            deprecate("Unsupported output_type", "1.0.0", deprecation_message, standard_warn=False)
            output_type = "np"

        if output_type == "latent":
            return image

        if do_denormalize is None:
            do_denormalize = [self.config.do_normalize] * image.shape[0]

        image = torch.stack(
            [self.denormalize(image[i]) if do_denormalize[i] else image[i] for i in range(image.shape[0])]
        )

        if output_type == "pt":
            return image

        image = self.pt_to_numpy(image)

        if output_type == "np":
            return image

        if output_type == "pil":
            return self.numpy_to_pil(image)

    def apply_overlay(
        self,
        mask: PIL.Image.Image,
        init_image: PIL.Image.Image,
        image: PIL.Image.Image,
        crop_coords: Optional[Tuple[int, int, int, int]] = None,
    ) -> PIL.Image.Image:
        """
        overlay the inpaint output to the original image
        """

        width, height = image.width, image.height

        init_image = self.resize(init_image, width=width, height=height)
        mask = self.resize(mask, width=width, height=height)

        init_image_masked = PIL.Image.new("RGBa", (width, height))
        init_image_masked.paste(init_image.convert("RGBA").convert("RGBa"), mask=ImageOps.invert(mask.convert("L")))
        init_image_masked = init_image_masked.convert("RGBA")

        if crop_coords is not None:
            x, y, x2, y2 = crop_coords
            w = x2 - x
            h = y2 - y
            base_image = PIL.Image.new("RGBA", (width, height))
            image = self.resize(image, height=h, width=w, resize_mode="crop")
            base_image.paste(image, (x, y))
            image = base_image.convert("RGB")

        image = image.convert("RGBA")
        image.alpha_composite(init_image_masked)
        image = image.convert("RGB")

        return image