Module: Arrolio::Renderer::Pdf::Assets

Included in:
Arrolio::Renderer::Pdf
Defined in:
lib/arrolio/renderer/pdf/assets.rb

Overview

Extracted concern: Pdfrb coupling points kept out of the emission path.

Instance Method Summary collapse

Instance Method Details

#cover_logo_style ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 60

def cover_logo_style
  return @cover_logo_style if @cover_logo_style

  config = @layout_spec&.cover_logo_config || {}
  width_mm = config['width_mm'] || 35.0
  ratio = config['aspect_ratio'] || (1459.0 / 1667.0)
  margin_mm = config['margin_mm'] || 25.5
  @cover_logo_style = {
    width: width_mm * MM_TO_PT,
    height: width_mm * ratio * MM_TO_PT,
    margin: margin_mm * MM_TO_PT
  }.freeze
end

#rasterize_svg(svg_path, png_path) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 49

def rasterize_svg(svg_path, png_path)
  require 'open3'
  result = Open3.capture3('rsvg-convert', '-d', '96', '-p', '96',
                          '-o', png_path, svg_path)
  return if result[2].success?

  Arrolio::Logger.warn "rsvg-convert failed: #{result[1]}"
rescue StandardError => e
  Arrolio::Logger.warn "rasterize_svg failed: #{e.class}: #{e.message[0, 80]}"
end

#register_image(path) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 18

def register_image(path)
  return @images[path] if @images.key?(path)

  resolved = resolve_image_for_pdfrb(path)
  return nil unless resolved

  @images[path] = @document.images.add(resolved)
rescue StandardError => e
  Arrolio::Logger.warn "register_image failed for #{path}: #{e.class}: #{e.message[0, 80]}"
  nil
end

#register_logo(path) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 9

def (path)
  return nil unless path

  @document.images.add(path)
rescue StandardError => e
  Arrolio::Logger.warn "logo load failed: #{e.class}: #{e.message[0, 80]}"
  nil
end

#render_cover_logo(canvas, page) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 74

def (canvas, page)
  logo_style = cover_logo_style
  w = logo_style[:width]
  h = logo_style[:height]
  margin = logo_style[:margin]
  x = page.width - margin - w
  y = page.height - margin - h
  invoke = invoke_xobject_op
  return unless invoke

  canvas.save_graphics_state do
    canvas.concat(w, 0, 0, h, x, y)
    canvas.emit_op(invoke, @logo_ref)
  end
rescue StandardError => e
  Arrolio::Logger.warn "logo render failed: #{e.class}: #{e.message[0, 80]}"
end

#resolve_image_for_pdfrb(path) ⇒ Object

Pdfrb supports JPEG, PNG, and PDF — not SVG. If path is an SVG file, rasterize it to PNG via rsvg-convert and cache the result. Returns the path to a pdfrb-compatible image file.



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 33

def resolve_image_for_pdfrb(path)
  return path unless path.to_s.end_with?('.svg', '.SVG')
  return path unless File.exist?(path)

  png_path = svg_to_png_cache_path(path)
  return png_path if File.exist?(png_path)

  rasterize_svg(path, png_path)
  File.exist?(png_path) ? png_path : path
end

#svg_to_png_cache_path(svg_path) ⇒ Object 



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# File 'lib/arrolio/renderer/pdf/assets.rb', line 44

def svg_to_png_cache_path(svg_path)
  digest = Digest::MD5.file(svg_path).hexdigest
  File.join(Dir.tmpdir, 'arrolio-svg-' + digest + '.png')
end