[PyGerber]: When I am trying to import and render .art Gerber Files from Cadence Allegro, it shows error

[Rajkisan]

PyGerber Bug Report

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This is my code

from pygerber.gerber.api import GerberFile


# Function to read the file content and process it with pygerber
def process_gerber_file(file_path):
        # Open the Gerber file and read the entire content into a string
        with open(file_path, 'r') as gerber_file:
            gerber_content = gerber_file.read()

        # Create a GerberFile object using pygerber and load the content as a string
        outline_layer = GerberFile.from_str(gerber_content)
        vm = outline_layer.render_with_pillow()
        bounding_box = vm.get_image_space()
        width = bounding_box.max_x_mm - bounding_box.min_x_mm
        height = bounding_box.max_y_mm - bounding_box.min_y_mm
        print(width, height)



# Example usage: Replace with the path to your Gerber file
gerber_file_path = "BOTTOM.art"
process_gerber_file(gerber_file_path)

It shows raise EmptyAutoSizedLayerNotAllowedError(top_layer.layer_id) pygerber.vm.types.errors.EmptyAutoSizedLayerNotAllowedError: id='%main%'

Expected behavior

It has to return the size by width and height of the layer

Environment:

Please complete the following information:

• Operating system: [macOS24.04]
• Python version: [3.12.0]
• PyGerber version: [3.0.0a3]

[Rajkisan]

Flexray_board_fabrication_and_assembly.zip TOP.art and BOTTOM.art

[Argmaster]

Hi, thanks for reporting the issue. If I were to quickly point some fingers on possible culprits, this behavior can be triggered by for example rendering empty file or rendering with too low resolution. I haven't yet investigated deeper, I will do that soon. I acknowledge that this is not the most helpful message one could get, I will work on that in the future releases. Issue #313 is somewhat related, but I haven't yet started working on that.

[Rajkisan]

Any update in this ?

[Argmaster]

One of the problem with that files is following line: %IR0*IPPOS*OFA0.00000B0.00000*MIA0B0*SFA1.00000B1.00000*% - this is not a valid Gerber code, merging multiple extended commands in one is not part of the standard. It is one of problems highlighted in #367, I have made some more comments about this problem in that issue as well as suggested a solution, but right now I don't have time to implement such heavy deviation from parser principles. If you are interested you could try following instructions from #367 comment and implement it for 3.0.0b1

As for pygerber.vm.types.errors.EmptyAutoSizedLayerNotAllowedError, this should go away after adding workaround for unusual extended command syntax.