Add antialias config option

Closes #41

lib/squib/card.rb

@@ -25,6 +25,7 @@ module Squib
       @svgfile       = "#{deck.dir}/#{deck.prefix}#{deck.count_format % index}.svg"
       @cairo_surface = make_surface(@svgfile, backend)
       @cairo_context = Squib::Graphics::CairoContextWrapper.new(Cairo::Context.new(@cairo_surface))
+      @cairo_context.antialias = @deck.antialias
     end
 
     def make_surface(svgfile, backend)

lib/squib/constants.rb

@@ -63,6 +63,7 @@ module Squib
     #
     # @api public
     CONFIG_DEFAULTS = {
+      'antialias'     => 'best',
       'backend'       => 'memory',
       'count_format'  => SYSTEM_DEFAULTS[:count_format],
       'custom_colors' => {},

lib/squib/deck.rb

@@ -30,7 +30,7 @@ module Squib
 
     # :nodoc:
     # @api private
-    attr_reader :text_hint
+    attr_reader :text_hint, :antialias
 
     # :nodoc:
     # @api private
@@ -58,6 +58,7 @@ module Squib
     # @param block [Block] the main body of the script.
     # @api public
     def initialize(width: 825, height: 1125, cards: 1, dpi: 300, config: 'config.yml', layout: nil, &block)
+      @antialias     = CONFIG_DEFAULTS['antialias']
       @dpi           = dpi
       @font          = SYSTEM_DEFAULTS[:default_font]
       @cards         = []
@@ -109,6 +110,7 @@ module Squib
         @dir                  = config['dir']
         @prefix               = config['prefix']
         @count_format         = config['count_format']
+        @antialias            = config['antialias']
       end
     end
 

lib/squib/graphics/cairo_context_wrapper.rb

@@ -15,7 +15,8 @@ module Squib
         :translate, :rotate, :move_to, :update_pango_layout, :width, :height,
         :show_pango_layout, :rounded_rectangle, :set_line_width, :stroke, :fill,
         :set_source, :scale, :render_rsvg_handle, :circle, :triangle, :line_to,
-        :operator=, :show_page, :clip, :transform, :mask, :create_pango_layout
+        :operator=, :show_page, :clip, :transform, :mask, :create_pango_layout,
+        :antialias=
 
       def set_source_squibcolor(arg)
         if match = arg.match(LINEAR_GRADIENT)

lib/squib/project_template/config.yml

@@ -4,6 +4,9 @@
 # Default: 300
 #dpi: 72
 
+#antialias: best #recommended. Only about 10% slower than fast
+#antialias: default # set the anti-aliasing algorithm. default defers to the underlying graphics device. See http://www.cairographics.org/manual/cairo-cairo-t.html#cairo-antialias-t
+
 # Text hints are used to show the boundaries of text boxes.
 # Can be enabled/disabled at the command-level, or set globally with `set`
 #text_hint: '#F00'
@@ -21,5 +24,4 @@
 
 # Use a SVG cairo back end, instead of an in-memory buffer
 # backend: :memory # default
-# backend: :svg    # slower, but can create scalable pdfs
-# tmp_dir: _tmp # for SVG backend, you MUST specify a tmp_dir
+# backend: :svg    # can create scalable pdfs, but rendering done at the printer level is not as good as Cairo.