Class: Converted::PNG

Inherits:
Object
  • Object
show all
Defined in:
lib/converted/png.rb

Constant Summary collapse

TMP_DIR =

Define the tmp directory path

File.join(Dir.pwd, 'tmp')

Instance Method Summary collapse

Constructor Details

#initialize(input_file) ⇒ PNG

Returns a new instance of PNG.



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# File 'lib/converted/png.rb', line 8

def initialize(input_file)
  @input_file = input_file
  unless File.exist?(@input_file)
    raise "Error: Input file #{@input_file} does not exist."
  end
end

Instance Method Details

#convert_to_avif(output_file = nil) ⇒ Object 



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# File 'lib/converted/png.rb', line 55

def convert_to_avif(output_file = nil)
  output_file ||= tmp_file(change_extension(@input_file, 'avif'))
  run_ffmpeg_command("-c:v libaom-av1 -crf 30", output_file, "AVIF", white_background: false)
end

#convert_to_bmp(output_file = nil, with_transparency: false) ⇒ Object 



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# File 'lib/converted/png.rb', line 60

def convert_to_bmp(output_file = nil, with_transparency: false)
  output_file ||= tmp_file(change_extension(@input_file, 'bmp'))
  options = with_transparency ? "" : "-vf 'format=bgr24'"
  run_ffmpeg_command(options, output_file, "BMP", white_background: !with_transparency)
end

#convert_to_gif(output_file = nil) ⇒ Object 



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# File 'lib/converted/png.rb', line 20

def convert_to_gif(output_file = nil)
  output_file ||= tmp_file(change_extension(@input_file, 'gif'))
  palette_file = tmp_file('palette.png')

  unless ffmpeg_installed?
    raise "Error: ffmpeg is not installed or not in the system PATH."
  end

  FileUtils.mkdir_p(TMP_DIR) # Ensure tmp directory exists

  # Generate a palette for better GIF quality
  palettegen_command = "ffmpeg -i \"#{@input_file}\" -vf \"palettegen\" \"#{palette_file}\" -y"
  puts "Generating palette for GIF conversion..."
  system(palettegen_command)

  if File.exist?(palette_file)
    # Use the palette for the actual GIF conversion
    gif_command = "ffmpeg -i \"#{@input_file}\" -i \"#{palette_file}\" -filter_complex \"paletteuse\" \"#{output_file}\" -y"
    puts "Converting to GIF: #{output_file}..."
    if system(gif_command)
      puts "GIF conversion complete: #{output_file}"
    else
      puts "Error: GIF conversion failed."
    end
    File.delete(palette_file) if File.exist?(palette_file) # Clean up temporary palette file
  else
    puts "Error: Failed to generate palette for GIF conversion."
  end
end

#convert_to_ico(output_file = nil) ⇒ Object 



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# File 'lib/converted/png.rb', line 66

def convert_to_ico(output_file = nil)
  output_file ||= tmp_file(change_extension(@input_file, 'ico'))

  unless ffmpeg_installed?
    raise "Error: ffmpeg is not installed or not in the system PATH."
  end

  FileUtils.mkdir_p(TMP_DIR) # Ensure tmp directory exists

  # Resize to a standard ICO size (e.g., 256x256 for high-quality icons)
  resize_command = "ffmpeg -i \"#{@input_file}\" -vf \"scale=256:256:force_original_aspect_ratio=decrease,pad=256:256:(ow-iw)/2:(oh-ih)/2:white\" \"#{output_file}\" -y"
  puts "Converting to ICO with resizing: #{output_file}..."
  if system(resize_command)
    puts "ICO conversion complete: #{output_file}"
  else
    puts "Error: ICO conversion failed."
  end
end

#convert_to_jpg(output_file = nil) ⇒ Object 



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# File 'lib/converted/png.rb', line 15

def convert_to_jpg(output_file = nil)
  output_file ||= tmp_file(change_extension(@input_file, 'jpg'))
  run_ffmpeg_command("-vf 'format=yuvj422p,scale=trunc(iw/2)*2:trunc(ih/2)*2'", output_file, "JPG", white_background: true)
end

#convert_to_webp(output_file = nil) ⇒ Object 



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# File 'lib/converted/png.rb', line 50

def convert_to_webp(output_file = nil)
  output_file ||= tmp_file(change_extension(@input_file, 'webp'))
  run_ffmpeg_command("-c:v libwebp -lossless 1", output_file, "WEBP", white_background: false)
end