fonts: start adding new stuff to FontConfiguration

src/font/ftfont.rs

@@ -78,13 +78,7 @@ impl Font for FreeTypeFontImpl {
         // when changing the load flags, we also need
         // to change them for harfbuzz otherwise it won't
         // hint correctly
-        let load_flags = (ftwrap::FT_LOAD_COLOR) as i32 |
-            // enable FT_LOAD_TARGET bits.  There are no flags defined
-            // for these in the bindings so we do some bit magic for
-            // ourselves.  This is how the FT_LOAD_TARGET_() macro
-            // assembles these bits.
-            (render_mode as i32) << 16;
-
+        let load_flags = ftwrap::compute_load_flags_for_mode(render_mode);
         self.font.borrow_mut().set_load_flags(load_flags);
 
         // This clone is conceptually unsafe, but ok in practice as we are

src/font/ftwrap.rs

@@ -1,5 +1,6 @@
 //! Higher level freetype bindings
 
+use crate::font::loader::FontDataHandle;
 use failure::{bail, format_err, Error, Fallible, ResultExt};
 pub use freetype::*;
 use std::ffi::CString;
@@ -19,6 +20,15 @@ fn ft_result<T>(err: FT_Error, t: T) -> Result<T, Error> {
     }
 }
 
+pub fn compute_load_flags_for_mode(render_mode: FT_Render_Mode) -> i32 {
+    FT_LOAD_COLOR as i32 |
+            // enable FT_LOAD_TARGET bits.  There are no flags defined
+            // for these in the bindings so we do some bit magic for
+            // ourselves.  This is how the FT_LOAD_TARGET_() macro
+            // assembles these bits.
+            (render_mode as i32) << 16
+}
+
 pub struct Face {
     pub face: FT_Face,
     _bytes: Vec<u8>,
@@ -172,6 +182,15 @@ impl Library {
         Ok(Library { lib })
     }
 
+    pub fn face_from_locator(&self, handle: &FontDataHandle) -> Fallible<Face> {
+        match handle {
+            FontDataHandle::OnDisk { path, index } => {
+                self.new_face(path.to_str().unwrap(), *index as _)
+            }
+            FontDataHandle::Memory { data, index } => self.new_face_from_slice(&data, *index as _),
+        }
+    }
+
     #[cfg(any(target_os = "macos", windows))]
     pub fn load_font_kit_handle(&self, handle: &font_kit::handle::Handle) -> Result<Face, Error> {
         use font_kit::handle::Handle;

src/font/loader/mod.rs

@@ -1,6 +1,8 @@
 use crate::config::FontAttributes;
-use failure::Fallible;
+use failure::{format_err, Error, Fallible};
+use serde_derive::*;
 use std::path::PathBuf;
+use std::sync::Mutex;
 
 #[cfg(all(unix, any(feature = "fontconfig", not(target_os = "macos"))))]
 pub mod font_config;
@@ -25,3 +27,79 @@ pub trait FontLocator {
     /// FontDataHandle's that correspond to it
     fn load_fonts(&self, fonts_selection: &[FontAttributes]) -> Fallible<Vec<FontDataHandle>>;
 }
+
+#[derive(Debug, Deserialize, Clone, Copy)]
+pub enum FontLocatorSelection {
+    FontConfig,
+    FontLoader,
+    FontKit,
+}
+
+lazy_static::lazy_static! {
+    static ref DEFAULT_LOCATOR: Mutex<FontLocatorSelection> = Mutex::new(Default::default());
+}
+
+impl Default for FontLocatorSelection {
+    fn default() -> Self {
+        if cfg!(all(unix, not(target_os = "macos"))) {
+            FontLocatorSelection::FontConfig
+        } else {
+            FontLocatorSelection::FontLoader
+        }
+    }
+}
+
+impl FontLocatorSelection {
+    pub fn set_default(self) {
+        let mut def = DEFAULT_LOCATOR.lock().unwrap();
+        *def = self;
+    }
+
+    pub fn get_default() -> Self {
+        let def = DEFAULT_LOCATOR.lock().unwrap();
+        *def
+    }
+
+    pub fn variants() -> Vec<&'static str> {
+        vec!["FontConfig", "FontLoader", "FontKit"]
+    }
+
+    pub fn new_locator(self) -> Box<dyn FontLocator> {
+        match self {
+            Self::FontConfig => {
+                #[cfg(all(unix, any(feature = "fontconfig", not(target_os = "macos"))))]
+                return Box::new(font_config::FontConfigFontLocator {});
+                #[cfg(not(all(unix, any(feature = "fontconfig", not(target_os = "macos")))))]
+                panic!("fontconfig not compiled in");
+            }
+            Self::FontLoader => {
+                #[cfg(any(target_os = "macos", windows))]
+                return Box::new(font_loader::FontLoaderFontLocator {});
+                #[cfg(not(any(target_os = "macos", windows)))]
+                panic!("fontloader not compiled in");
+            }
+            Self::FontKit => {
+                #[cfg(any(target_os = "macos", windows))]
+                return Box::new(::font_kit::source::SystemSource::new());
+                #[cfg(not(any(target_os = "macos", windows)))]
+                panic!("fontkit not compiled in");
+            }
+        }
+    }
+}
+
+impl std::str::FromStr for FontLocatorSelection {
+    type Err = Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_lowercase().as_ref() {
+            "fontconfig" => Ok(Self::FontConfig),
+            "fontloader" => Ok(Self::FontLoader),
+            "fontkit" => Ok(Self::FontKit),
+            _ => Err(format_err!(
+                "{} is not a valid FontLocatorSelection variant, possible values are {:?}",
+                s,
+                Self::variants()
+            )),
+        }
+    }
+}

src/font/mod.rs

@@ -34,19 +34,28 @@ pub mod fontloader_and_freetype;
 #[cfg(any(target_os = "macos", windows))]
 pub mod fontkit;
 
+use crate::font::loader::{FontLocator, FontLocatorSelection};
+
 use super::config::{configuration, ConfigHandle, TextStyle};
 use term::CellAttributes;
 
+pub struct LoadedFont {
+    rasterizer: Box<dyn rasterizer::FontRasterizer>,
+    shaper: Box<dyn shaper::FontShaper>,
+}
+
 type FontPtr = Rc<RefCell<Box<dyn NamedFont>>>;
 
 /// Matches and loads fonts for a given input style
 pub struct FontConfiguration {
     fonts: RefCell<HashMap<TextStyle, FontPtr>>,
+    new_fonts: RefCell<HashMap<TextStyle, Rc<LoadedFont>>>,
     system: Rc<dyn FontSystem>,
     metrics: RefCell<Option<FontMetrics>>,
     dpi_scale: RefCell<f64>,
     font_scale: RefCell<f64>,
     config_generation: RefCell<usize>,
+    loader: Box<dyn FontLocator>,
 }
 
 #[derive(Debug, Deserialize, Clone, Copy)]
@@ -111,6 +120,7 @@ impl FontSystemSelection {
             }
         }
     }
+
     pub fn variants() -> Vec<&'static str> {
         vec![
             "FontConfigAndFreeType",
@@ -153,8 +163,11 @@ impl std::str::FromStr for FontSystemSelection {
 impl FontConfiguration {
     /// Create a new empty configuration
     pub fn new(system: FontSystemSelection) -> Self {
+        let loader = FontLocatorSelection::get_default().new_locator();
         Self {
             fonts: RefCell::new(HashMap::new()),
+            loader,
+            new_fonts: RefCell::new(HashMap::new()),
             system: system.new_font_system(),
             metrics: RefCell::new(None),
             font_scale: RefCell::new(1.0),

src/font/rasterizer/freetype.rs

@@ -19,12 +19,7 @@ impl FontRasterizer for FreeTypeRasterizer {
  //       ftwrap::FT_Render_Mode::FT_RENDER_MODE_LCD;
         ftwrap::FT_Render_Mode::FT_RENDER_MODE_LIGHT;
 
-        let load_flags = (ftwrap::FT_LOAD_COLOR) as i32 |
-            // enable FT_LOAD_TARGET bits.  There are no flags defined
-            // for these in the bindings so we do some bit magic for
-            // ourselves.  This is how the FT_LOAD_TARGET_() macro
-            // assembles these bits.
-            (render_mode as i32) << 16;
+        let load_flags = ftwrap::compute_load_flags_for_mode(render_mode);
 
         let mut face = self.face.borrow_mut();
         let descender = unsafe { (*(*face.face).size).metrics.descender as f64 / 64.0 };
@@ -268,9 +263,7 @@ impl FreeTypeRasterizer {
         }
     }
 
-    pub fn with_face_size_and_dpi(mut face: ftwrap::Face, size: f64, dpi: u32) -> Fallible<Self> {
-        face.set_font_size(size, dpi)?;
-
+    pub fn with_face(face: ftwrap::Face) -> Fallible<Self> {
         let has_color = unsafe {
             (((*face.face).face_flags as u32) & (ftwrap::FT_FACE_FLAG_COLOR as u32)) != 0
         };

src/font/shaper/harfbuzz.rs

@@ -1,5 +1,6 @@
 use crate::font::ftwrap;
 use crate::font::hbwrap as harfbuzz;
+use crate::font::loader::FontDataHandle;
 use crate::font::shaper::FontShaper;
 use crate::font::system::GlyphInfo;
 use failure::{bail, Fallible};
@@ -13,9 +14,24 @@ struct FontPair {
 
 pub struct HarfbuzzShaper {
     fonts: Vec<RefCell<FontPair>>,
+    lib: ftwrap::Library,
 }
 
 impl HarfbuzzShaper {
+    pub fn new(handles: &[FontDataHandle]) -> Fallible<Self> {
+        let lib = ftwrap::Library::new()?;
+        let mut fonts = vec![];
+        for handle in handles {
+            let face = lib.face_from_locator(handle)?;
+            let mut font = harfbuzz::Font::new(face.face);
+            let render_mode = ftwrap::FT_Render_Mode::FT_RENDER_MODE_LIGHT;
+            let load_flags = ftwrap::compute_load_flags_for_mode(render_mode);
+            font.set_load_flags(load_flags);
+            fonts.push(RefCell::new(FontPair { face, font }));
+        }
+        Ok(Self { fonts, lib })
+    }
+
     fn do_shape(
         &self,
         font_idx: crate::font::system::FallbackIdx,