# These functions can be used to generate a CFB font include file from
# a TrueType/OpenType font file or an image file.
function(generate_cfb_font
    input_file  # The TrueType/OpenType font file or the image file
    output_file # The generated header file
    width       # Width of the CFB font elements in pixels
    height      # Height of the CFB font elements in pixels
    )
  add_custom_command(
    OUTPUT ${output_file}
    COMMAND
    ${PYTHON_EXECUTABLE}
    ${ZEPHYR_BASE}/scripts/gen_cfb_font_header.py
    --input ${input_file}
    --output ${output_file}
    --width ${width}
    --height ${height}
    ${ARGN} # Extra arguments are passed to gen_cfb_font_header.py
    DEPENDS ${source_file}
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    )
endfunction()

function(generate_cfb_font_for_gen_target
    target          # The cmake target that depends on the generated file
    input_file      # The TrueType/OpenType font file or the image file
    output_file     # The generated header file
    width           # Width of the CFB font elements in pixels
    height          # Height of the CFB font elements in pixels
    gen_target      # The generated file target we depend on
                    # Any additional arguments are passed on to
                    # gen_cfb_font_header.py
    )
  generate_cfb_font(${input_file} ${output_file} ${width} ${height} ${ARGN})

  # Ensure 'output_file' is generated before 'target' by creating a
  # dependency between the two targets

  add_dependencies(${target} ${gen_target})
endfunction()

function(generate_cfb_font_for_target
    target          # The cmake target that depends on the generated file
    input_file      # The TrueType/OpenType font file or image file
    output_file     # The generated header file
    width           # Width of the CFB font elements in pixels
    height          # Height of the CFB font elements in pixels
                    # Any additional arguments are passed on to
                    # gen_cfb_font_header.py
    )
  # Ensure 'output_file' is generated before 'target' by creating a
  # 'custom_target' for it and setting up a dependency between the two
  # targets

  # But first create a unique name for the custom target
  generate_unique_target_name_from_filename(${output_file} generated_target_name)

  add_custom_target(${generated_target_name} DEPENDS ${output_file})
  generate_cfb_font_for_gen_target(${target} ${input_file} ${output_file}
    ${width} ${height} ${generated_target_name} ${ARGN})
endfunction()