[WIP] Add antialias optionantialias-option

Still a WIP because of unimplemented Linux portion.

Support has been added for font rasterization options. At this time, the
only supported option is antialias. It's a tri-state flag which can be
either ~ for "use default", true to force antialias, and false to force
disable antialias.

The options may be specified both globally and per font section. The per
font sections override global options. An example of a complex config
follows. In the example, the global value requests using default
antialias settings, and the normal face disables antialias.

    font:
      options:
        antialias: ~
      normal:
        family: monospace
        options:
          antialias: false

Finally, note that the top level font.options is used for fallback
fonts.

1 files changed, 11 insertions, 1 deletions

diff --git a/src/config.rs b/src/config.rs
index 3f3b6942..8f4f4450 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -14,7 +14,7 @@ use std::time::Duration;
 use std::collections::HashMap;
 
 use ::Rgb;
-use font::Size;
+use font::{self, Size};
 use serde_yaml;
 use serde::{self, de, Deserialize};
 use serde::de::Error as SerdeError;
@@ -1305,6 +1305,10 @@ impl DeserializeFromF32 for Size {
 /// doesn't provide complete config is Ok.
 #[derive(Debug, Deserialize, Clone)]
 pub struct Font {
+    /// Default font rasterization options
+    #[serde(default)]
+    pub options: font::Options,
+
     /// Font family
     pub normal: FontDescription,
 
@@ -1342,6 +1346,9 @@ fn default_italic_desc() -> FontDescription {
 pub struct FontDescription {
     pub family: String,
     pub style: Option<String>,
+    /// Rasterization options for this font.
+    #[serde(default)]
+    pub options: font::Options,
 }
 
 impl FontDescription {
@@ -1349,6 +1356,7 @@ impl FontDescription {
         FontDescription {
             family: family.into(),
             style: None,
+            options: Default::default(),
         }
     }
 }
@@ -1389,6 +1397,7 @@ impl Font {
 impl Default for Font {
     fn default() -> Font {
         Font {
+            options: Default::default(),
             normal: FontDescription::new_with_family("Menlo"),
             bold: FontDescription::new_with_family("Menlo"),
             italic: FontDescription::new_with_family("Menlo"),
@@ -1404,6 +1413,7 @@ impl Default for Font {
 impl Default for Font {
     fn default() -> Font {
         Font {
+            options: Default::default(),
             normal: FontDescription::new_with_family("monospace"),
             bold: FontDescription::new_with_family("monospace"),
             italic: FontDescription::new_with_family("monospace"),