png bottom image flipped

hello,

using the test files attached I got a perfect image from the up, but a wrong image in the bottom:

As you can see the silkscreen and the drill files should be inversed. Uploading the same files on OSHPark brings to correct images

Gerber-test.zip

This is my test file:

import os
from gerber import load_layer
from gerber.render import RenderSettings, theme
from gerber.render.cairo_backend import GerberCairoContext

GERBER_FOLDER = "C:\\Users\\vincenzo\\Desktop\\Gerber-test\\"
output = "C:\\Users\\vincenzo\\Desktop\\"

# The default style can be overridden by passing a RenderSettings instance to
# render_layer().
# First, create a settings object:
our_settings = RenderSettings(color=theme.COLORS['white'], alpha=0.85)

# Open the gerber files
drill = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328.drl'))

copper = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-F_Cu.gbr'))
mask = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-F_Mask.gbr'))
silk = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-F_SilkS.gbr'))

# Create a new drawing context
ctx = GerberCairoContext()

# Draw the copper layer. render_layer() uses the default color scheme for the
# layer, based on the layer type. Copper layers are rendered as
ctx.render_layer(copper)
ctx.render_layer(mask)
ctx.render_layer(silk, settings=our_settings)
ctx.render_layer(drill)

# Write output to png file
ctx.dump(os.path.join(os.path.dirname(__file__), 'cairo_example.png'))

# Clear the drawing
ctx.clear()

# Load the bottom layers
copper = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-B_Cu.gbr'))
mask = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-B_Mask.gbr'))
silk = load_layer(os.path.join(GERBER_FOLDER, 'ATMEGA328-B_SilkS.gbr'))

# Render bottom layers
ctx.render_layer(copper)
ctx.render_layer(mask)
ctx.render_layer(silk, settings=our_settings)
ctx.render_layer(drill)

# Write png file
ctx.dump(os.path.join(os.path.dirname(__file__), 'cairo_bottom.png'))

[MarinMikael]

You can also mirror the layer using RenderSettings:

from gerber.render import RenderSettings
ctx.render_layer(drill, settings=RenderSettings(mirror=True))

If you want more control about the appearance of your pcb, RenderSettings is the way to go.

I recommend you to use file.endswith(pattern) to check for patterns instead of for ".." in file.

[xiaoqiangnobug]

Hello, In the process of using it, I successfully render Gerber files on windows, but when porting to the Ubuntu system, all top layer inversion will appear when combined rendering, and there is no problem with single