Begin work on draw_unicode_char

Set color palette to standard 256 VGA palette

Cargo.toml

@@ -1,17 +1,12 @@
 [package]
 name = "vga"
-version = "0.2.6"
+version = "0.2.7"
 authors = ["Ryan Kennedy <rkennedy9064@gmail.com>"]
 edition = "2018"
 description = "Support for vga specific functions, data structures, and registers."
 documentation = "https://docs.rs/vga"
-keywords = [
+keywords = ["vga", "no_std"]
-    "vga",
+categories = ["no-std"]
-    "no_std",
-]
-categories = [
-    "no-std",
-]
 license = "MIT/Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/rust-osdev/vga"
@@ -20,11 +15,20 @@ repository = "https://github.com/rust-osdev/vga"
 
 [dependencies]
 bitflags = "1.2.1"
+spin = "0.9"
+log = "*"
+
 conquer-once = { version = "0.3.2", default-features = false }
-font8x8 = { version = "0.3.1", default-features = false, features = ["unicode"] }
+font8x8 = { version = "0.3.1", default-features = false, features = [
+    "unicode",
+] }
 spinning_top = { version = "0.2.4", features = ["nightly"] }
 x86_64 = "0.14.2"
-
 [dependencies.num-traits]
 version = "0.2.14"
 default-features = false
+
+[dependencies.ab_glyph]
+version = "0.2.15"
+default-features = false
+features = ["libm"]

src/colors.rs

@@ -69,7 +69,6 @@ impl TextModeColor {
         self.0 = foreground as u8;
     }
 }
-
 /// Represents the default vga 256 color palette.
 pub const DEFAULT_PALETTE: [u8; PALETTE_SIZE] = [
     0x0, 0x0, 0x0, 0x0, 0x0, 0x2A, 0x0, 0x2A, 0x0, 0x0, 0x2A, 0x2A, 0x2A, 0x0, 0x0, 0x2A, 0x0,

src/lib.rs

@@ -7,6 +7,8 @@
 #![no_std]
 #![warn(missing_docs)]
 
+extern crate alloc;
+
 pub mod colors;
 pub mod configurations;
 pub mod drawing;

src/writers/graphics_640x480x16.rs

@@ -5,6 +5,7 @@ use crate::{
     registers::{PlaneMask, WriteMode},
     vga::{VideoMode, VGA},
 };
+use core::convert::From;
 use font8x8::UnicodeFonts;
 
 const WIDTH: usize = 640;
@@ -122,6 +123,7 @@ impl Graphics640x480x16 {
 
     #[inline]
     fn _set_pixel(self, x: usize, y: usize, color: Color16) {
+        if x < 640 && y < 480 {
             let frame_buffer = self.get_frame_buffer();
             let offset = x / 8 + y * WIDTH_IN_BYTES;
             let pixel_mask = 0x80 >> (x & 0x07);
@@ -133,4 +135,77 @@ impl Graphics640x480x16 {
                 frame_buffer.add(offset).write_volatile(u8::from(color));
             }
         }
+    }
+}
+
+use ab_glyph::{Font, FontRef, Glyph};
+use log::trace;
+use spin::Lazy;
+
+const FONT_BASIC: Lazy<FontRef> = Lazy::new({
+    || FontRef::try_from_slice(include_bytes!("../../assets/fonts/unifont-14.0.01.ttf")).unwrap()
+});
+
+const FONT_SUPPLEMENTARY: Lazy<FontRef> = Lazy::new(|| {
+    FontRef::try_from_slice(include_bytes!(
+        "../../assets/fonts/unifont_upper-14.0.01.ttf"
+    ))
+    .unwrap()
+});
+
+const FONT_SCALE: f32 = 14.0;
+const GLYPH_HEIGHT: f32 = 10.0;
+const GLYPH_WIDTH: f32 = 8.0;
+
+impl Graphics640x480x16 {
+    /// Draw a glyph on the screen at the given position
+    ///
+    /// # Arguments
+    /// * `x` - the x position of the glyph
+    /// * `y` - the y position of the glyph
+    /// * `glyph` - the glyph to draw
+    /// * `color` - the color of the glyph
+    pub fn draw_unicode_char(&self, mut x: usize, mut y: usize, character: char, color: Color16) {
+        self.set_write_mode_2();
+
+        // trace!("Char {}", character);
+
+        // if character == '\n' {
+        //     return;
+        // }
+        if x == 80 {
+            x = 0;
+            y += 1;
+        }
+
+        if character != '\0' {
+            let real_x = x as f32 * GLYPH_WIDTH;
+            let real_y = (y as f32 + 1.0) * GLYPH_HEIGHT;
+            // trace!("REALX{}\nREALY{}", real_x, real_y);
+
+            let in_supp_plane = character as u32 > 0xffff;
+
+            let plane = match in_supp_plane {
+                false => FONT_BASIC,
+                true => FONT_SUPPLEMENTARY,
+            };
+
+            let q_glyph: Glyph = plane
+                .glyph_id(character)
+                .with_scale_and_position(FONT_SCALE, ab_glyph::point(real_x, real_y));
+
+            if let Some(q) = plane.outline_glyph(q_glyph) {
+                q.draw(|gx, gy, c| {
+                    if c > 0.1 {
+                        let corner = q.px_bounds().min;
+                        self._set_pixel(
+                            gx as usize + corner.x as usize,
+                            gy as usize + corner.y as usize,
+                            color,
+                        );
+                    }
+                });
+            }
+        }
+    }
 }