Magics does not plot all weekday names correctly for PNG/PDF output with LC_TIME=es_ES.UTF-8

What happened?

Magics does not plot all weekday names correctly for PNG/PDF output with LC_TIME=es_ES.UTF-8 (i.e., when CAIRO-PANGO is called).

What are the steps to reproduce the bug?

This is reproduced using the following Python script (based on Axis example 2):

#importing Magics module
from Magics.macro import *

ref = 'axis2'

#Setting of the output file name
output = output(
                output_formats = ['png','ps','eps','pdf'], 
                output_name_first_page_number = "off",
                output_name = ref
               )

#Setting the cartesian view
projection = mmap(
                  subpage_y_position= 2., 
                  subpage_map_projection = 'cartesian',
                  subpage_x_axis_type = 'date',
                  subpage_y_axis_type = 'regular',
                  subpage_x_date_min = "2012-04-10",
                  subpage_x_date_max = "2012-04-28",
                  subpage_y_min = -20.,
                  subpage_y_max = 20.
                 )

#Vertical axis
vertical = maxis(
                 axis_orientation = "vertical",
                 axis_grid =  "on",
                 axis_type =  "regular",
                 axis_grid_colour = "grey",
                 axis_grid_thickness = 1,
                 axis_grid_reference_level = 0.,
                 axis_grid_reference_line_style='solid',
                 axis_grid_reference_thickness=2,
                 axis_grid_line_style = "dot"
                )

#Horizontal axis
horizontal = maxis(
                   axis_orientation = "horizontal",
                   axis_type =  "date",
                   axis_grid =  "on",
                   axis_days_label_height =  0.4,
                   axis_months_label_height =  0.4,
                   axis_years_label_height =  0.4,
                   axis_grid_colour = "grey",
                   axis_grid_thickness = 1,
                   axis_grid_line_style = "dot"
                  )

lines =["Using time series...for units &mu;m - should be  micrometres with a Greek letter mu"]

title = mtext({
               "text_lines" : lines,
               "text_html" : "true",
               "text_justification": "left",
               "text_font_size": 0.75,
               "text_colour" : "charcoal"
             })

#To the plot
plot(output, projection, vertical, horizontal, title)

Run as:

$ env LC_TIME=es_ES.UTF-8 python3 axis2.py

Output shows error messages from CAIRO-PANGO:

b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc311\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc311</span>\n'
b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc318\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc318</span>\n'  
b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc325\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc325</span>\n'
b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc311\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc311</span>\n' 
b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc318\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc318</span>\n'
b'Magics-warning: CAIRO-PANGO: Error on line 1 char 72: Invalid UTF-8 encoded text in name - not valid \'mi\xc325\'\n  for text: <span color="#000000" font_family="sansserif" size="7168">mi\xc325</span>\n'

Plot shows the day of the week for Wednesday - (mi)ércoles - isn't plotted:

Compare with eps output which correctly shows "mi":

This also happens with other locales (LC_TIME settings) - not just es_ES.UTF-8.

See also plots attached to MAGP-1343 and SD-60066.

Version

4.14.1 and older

Platform (OS and architecture)

Linux ac6-200.bullx 4.18.0-372.52.1.el8_6.x86_64 #1 SMP Fri Mar 31 06:22:44 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux

Relevant log output

No response

Accompanying data

No response

Organisation

ECMWF (reporting on behalf of AEMET)

ecmwf / magics