Italic modifier support

.markdownlint.yaml

@@ -1,4 +1,5 @@
 no-inline-html:
   allowed_elements:
     - div
+    - img
 no-duplicate-heading: false

README.md

@@ -65,6 +65,31 @@ the `fonts` feature can be disabled by turning off the default crate features.
 [`ibm437`](https://crates.io/crates/ibm437) is a good alternative that includes
 some drawing characters, but is not as large as embedded-graphics-unicodefonts.
 
+### Bold and italic fonts
+
+Bold and italic modifiers are supported, but this requires providing fonts
+through `EmbeddedBackendConfig`.
+If only regular font is provided, it serves as a fallback.
+All fonts must be of the same size.
+
+```rust
+use mousefood::{EmbeddedBackend, EmbeddedBackendConfig, fonts};
+
+let config = EmbeddedBackendConfig {
+    font_regular: fonts::MONO_6X13,
+    font_bold: Some(fonts::MONO_6X13_BOLD),
+    font_italic: Some(fonts::MONO_6X13_ITALIC),
+    ..Default::default()
+};
+let backend = EmbeddedBackend::new(&mut display, config);
+```
+
+<div align="center">
+<img alt="Bold and Italic fonts"
+     src="https://github.com/j-g00da/mousefood/blob/6640da9402794ea8f9370e0dc2b4bd1ebf2c6356/assets/bold_italic.png?raw=true"
+     style="max-width: 640px"/>
+</div>
+
 ### Simulator
 
 Mousefood can be run in a simulator

src/backend.rs

@@ -28,7 +28,9 @@ where
     /// Regular font.
     pub font_regular: MonoFont<'static>,
     /// Bold font.
-    pub font_bold: MonoFont<'static>,
+    pub font_bold: Option<MonoFont<'static>>,
+    /// Italic font.
+    pub font_italic: Option<MonoFont<'static>>,
 }
 
 impl<D, C> Default for EmbeddedBackendConfig<D, C>
@@ -40,7 +42,8 @@ where
         Self {
             flush_callback: Box::new(|_| {}),
             font_regular: default_font::regular,
-            font_bold: default_font::bold,
+            font_bold: None,
+            font_italic: None,
         }
     }
 }
@@ -74,7 +77,8 @@ where
     buffer: framebuffer::HeapBuffer<C>,
 
     font_regular: MonoFont<'static>,
-    font_bold: MonoFont<'static>,
+    font_bold: Option<MonoFont<'static>>,
+    font_italic: Option<MonoFont<'static>>,
 
     char_offset: geometry::Point,
 
@@ -96,7 +100,8 @@ where
         #[cfg(not(feature = "simulator"))] flush_callback: impl FnMut(&mut D) + 'static,
         #[cfg(feature = "simulator")] flush_callback: impl FnMut(&mut SimulatorDisplay<C>) + 'static,
         font_regular: MonoFont<'static>,
-        font_bold: MonoFont<'static>,
+        font_bold: Option<MonoFont<'static>>,
+        font_italic: Option<MonoFont<'static>>,
     ) -> EmbeddedBackend<'display, D, C> {
         let pixels = layout::Size {
             width: display.bounding_box().size.width as u16,
@@ -109,6 +114,7 @@ where
             flush_callback: Box::new(flush_callback),
             font_regular,
             font_bold,
+            font_italic,
             char_offset: geometry::Point::new(0, font_regular.character_size.height as i32),
             columns_rows: layout::Size {
                 height: pixels.height / font_regular.character_size.height as u16,
@@ -139,6 +145,7 @@ where
             config.flush_callback,
             config.font_regular,
             config.font_bold,
+            config.font_italic,
         )
     }
 
@@ -181,9 +188,15 @@ where
 
             for modifier in cell.style().add_modifier.iter() {
                 style_builder = match modifier {
-                    style::Modifier::BOLD => style_builder.font(&self.font_bold),
+                    style::Modifier::BOLD => match &self.font_bold {
+                        None => style_builder.font(&self.font_regular),
+                        Some(font) => style_builder.font(font),
+                    },
                     style::Modifier::DIM => style_builder, // TODO
-                    style::Modifier::ITALIC => style_builder, // TODO
+                    style::Modifier::ITALIC => match &self.font_italic {
+                        None => style_builder.font(&self.font_regular),
+                        Some(font) => style_builder.font(font),
+                    },
                     style::Modifier::UNDERLINED => style_builder.underline(),
                     style::Modifier::SLOW_BLINK => style_builder, // TODO
                     style::Modifier::RAPID_BLINK => style_builder, // TODO

src/default_font.rs

@@ -1,9 +1,5 @@
 #[cfg(feature = "fonts")]
-pub use embedded_graphics_unicodefonts::MONO_6X10 as bold;
-#[cfg(feature = "fonts")]
 pub use embedded_graphics_unicodefonts::MONO_6X10 as regular;
 
 #[cfg(not(feature = "fonts"))]
 pub use embedded_graphics::mono_font::ascii::FONT_6X10 as regular;
-#[cfg(not(feature = "fonts"))]
-pub use embedded_graphics::mono_font::ascii::FONT_6X10 as bold;