ComfyUI/custom_nodes/ComfyMath/src/comfymath/graphics.py

from typing import Any, Mapping


SDXL_SUPPORTED_RESOLUTIONS = [
    (1024, 1024, 1.0),
    (1152, 896, 1.2857142857142858),
    (896, 1152, 0.7777777777777778),
    (1216, 832, 1.4615384615384615),
    (832, 1216, 0.6842105263157895),
    (1344, 768, 1.75),
    (768, 1344, 0.5714285714285714),
    (1536, 640, 2.4),
    (640, 1536, 0.4166666666666667),
]


class SDXLResolution:
    @classmethod
    def INPUT_TYPES(cls) -> Mapping[str, Any]:
        return {
            "required": {
                "resolution": (
                    [f"{res[0]}x{res[1]}" for res in SDXL_SUPPORTED_RESOLUTIONS],
                )
            }
        }

    RETURN_TYPES = ("INT", "INT")
    RETURN_NAMES = ("width", "height")
    FUNCTION = "op"
    CATEGORY = "math/graphics"

    def op(self, resolution: str) -> tuple[int, int]:
        width, height = resolution.split("x")
        return (int(width), int(height))


class NearestSDXLResolution:
    @classmethod
    def INPUT_TYPES(cls) -> Mapping[str, Any]:
        return {"required": {"image": ("IMAGE",)}}

    RETURN_TYPES = ("INT", "INT")
    RETURN_NAMES = ("width", "height")
    FUNCTION = "op"
    CATEGORY = "math/graphics"

    def op(self, image) -> tuple[int, int]:
        image_width = image.size()[2]
        image_height = image.size()[1]
        print(f"Input image resolution: {image_width}x{image_height}")
        image_ratio = image_width / image_height
        differences = [
            (abs(image_ratio - resolution[2]), resolution)
            for resolution in SDXL_SUPPORTED_RESOLUTIONS
        ]
        smallest = None
        for difference in differences:
            if smallest is None:
                smallest = difference
            else:
                if difference[0] < smallest[0]:
                    smallest = difference
        if smallest is not None:
            width = smallest[1][0]
            height = smallest[1][1]
        else:
            width = 1024
            height = 1024
        print(f"Selected SDXL resolution: {width}x{height}")
        return (width, height)


NODE_CLASS_MAPPINGS = {
    "CM_SDXLResolution": SDXLResolution,
    "CM_NearestSDXLResolution": NearestSDXLResolution,
}