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from typing import Type, List, Union, TypedDict
class BucketResolution(TypedDict):
width: int
height: int
# resolutions SDXL was trained on with a 1024x1024 base resolution
resolutions_1024: List[BucketResolution] = [
# SDXL Base resolution
{"width": 1024, "height": 1024},
# SDXL Resolutions, widescreen
{"width": 2048, "height": 512},
{"width": 1984, "height": 512},
{"width": 1920, "height": 512},
{"width": 1856, "height": 512},
{"width": 1792, "height": 576},
{"width": 1728, "height": 576},
{"width": 1664, "height": 576},
{"width": 1600, "height": 640},
{"width": 1536, "height": 640},
{"width": 1472, "height": 704},
{"width": 1408, "height": 704},
{"width": 1344, "height": 704},
{"width": 1344, "height": 768},
{"width": 1280, "height": 768},
{"width": 1216, "height": 832},
{"width": 1152, "height": 832},
{"width": 1152, "height": 896},
{"width": 1088, "height": 896},
{"width": 1088, "height": 960},
{"width": 1024, "height": 960},
# SDXL Resolutions, portrait
{"width": 960, "height": 1024},
{"width": 960, "height": 1088},
{"width": 896, "height": 1088},
{"width": 896, "height": 1152}, # 2:3
{"width": 832, "height": 1152},
{"width": 832, "height": 1216},
{"width": 768, "height": 1280},
{"width": 768, "height": 1344},
{"width": 704, "height": 1408},
{"width": 704, "height": 1472},
{"width": 640, "height": 1536},
{"width": 640, "height": 1600},
{"width": 576, "height": 1664},
{"width": 576, "height": 1728},
{"width": 576, "height": 1792},
{"width": 512, "height": 1856},
{"width": 512, "height": 1920},
{"width": 512, "height": 1984},
{"width": 512, "height": 2048},
# extra wides
{"width": 8192, "height": 128},
{"width": 128, "height": 8192},
]
# Even numbers so they can be patched easier
resolutions_dit_1024: List[BucketResolution] = [
# Base resolution
{"width": 1024, "height": 1024},
# widescreen
{"width": 2048, "height": 512},
{"width": 1792, "height": 576},
{"width": 1728, "height": 576},
{"width": 1664, "height": 576},
{"width": 1600, "height": 640},
{"width": 1536, "height": 640},
{"width": 1472, "height": 704},
{"width": 1408, "height": 704},
{"width": 1344, "height": 704},
{"width": 1344, "height": 768},
{"width": 1280, "height": 768},
{"width": 1216, "height": 832},
{"width": 1152, "height": 832},
{"width": 1152, "height": 896},
{"width": 1088, "height": 896},
{"width": 1088, "height": 960},
{"width": 1024, "height": 960},
# portrait
{"width": 960, "height": 1024},
{"width": 960, "height": 1088},
{"width": 896, "height": 1088},
{"width": 896, "height": 1152}, # 2:3
{"width": 832, "height": 1152},
{"width": 832, "height": 1216},
{"width": 768, "height": 1280},
{"width": 768, "height": 1344},
{"width": 704, "height": 1408},
{"width": 704, "height": 1472},
{"width": 640, "height": 1536},
{"width": 640, "height": 1600},
{"width": 576, "height": 1664},
{"width": 576, "height": 1728},
{"width": 576, "height": 1792},
{"width": 512, "height": 1856},
{"width": 512, "height": 1920},
{"width": 512, "height": 1984},
{"width": 512, "height": 2048},
]
def get_bucket_sizes(resolution: int = 512, divisibility: int = 8) -> List[BucketResolution]:
# determine scaler form 1024 to resolution
scaler = resolution / 1024
bucket_size_list = []
for bucket in resolutions_1024:
# must be divisible by 8
width = int(bucket["width"] * scaler)
height = int(bucket["height"] * scaler)
if width % divisibility != 0:
width = width - (width % divisibility)
if height % divisibility != 0:
height = height - (height % divisibility)
bucket_size_list.append({"width": width, "height": height})
return bucket_size_list
def get_resolution(width, height):
num_pixels = width * height
# determine same number of pixels for square image
square_resolution = int(num_pixels ** 0.5)
return square_resolution
def get_bucket_for_image_size(
width: int,
height: int,
bucket_size_list: List[BucketResolution] = None,
resolution: Union[int, None] = None,
divisibility: int = 8
) -> BucketResolution:
if bucket_size_list is None and resolution is None:
# get resolution from width and height
resolution = get_resolution(width, height)
if bucket_size_list is None:
# if real resolution is smaller, use that instead
real_resolution = get_resolution(width, height)
resolution = min(resolution, real_resolution)
bucket_size_list = get_bucket_sizes(resolution=resolution, divisibility=divisibility)
# Check for exact match first
for bucket in bucket_size_list:
if bucket["width"] == width and bucket["height"] == height:
return bucket
# If exact match not found, find the closest bucket
closest_bucket = None
min_removed_pixels = float("inf")
for bucket in bucket_size_list:
scale_w = bucket["width"] / width
scale_h = bucket["height"] / height
# To minimize pixels, we use the larger scale factor to minimize the amount that has to be cropped.
scale = max(scale_w, scale_h)
new_width = int(width * scale)
new_height = int(height * scale)
removed_pixels = (new_width - bucket["width"]) * new_height + (new_height - bucket["height"]) * new_width
if removed_pixels < min_removed_pixels:
min_removed_pixels = removed_pixels
closest_bucket = bucket
if closest_bucket is None:
raise ValueError("No suitable bucket found")
return closest_bucket
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