1 files changed, 122 insertions, 0 deletions
diff --git a/src/bin/br/config.rs b/src/bin/br/config.rs
new file mode 100644
index 0000000..56d5190
--- /dev/null
+++ b/src/bin/br/config.rs
@@ -0,0 +1,122 @@
+use crate::*;
+
+
+#[derive(Copy, Clone, PartialEq)]
+pub enum Mode {
+    Graphical,
+    Headless,
+    Dynamic,
+}
+
+impl Mode {
+    pub fn from_str(string: &str) -> Self {
+        match string {
+            "g" | "graphical" => Self::Graphical,
+            "h" | "headless" => Self::Headless,
+            "d" | "dynamic" => Self::Dynamic,
+            _ => fatal!("Invalid mode string '{string}'"),
+        }
+    }
+}
+
+
+pub fn parse_dimensions(string: &str) -> ScreenDimensions {
+    fn parse_inner(string: &str) -> Option<ScreenDimensions> {
+        let (w_str, h_str) = string.trim().split_once('x')?;
+        Some( ScreenDimensions {
+            width:  w_str.parse().ok()?,
+            height: h_str.parse().ok()?,
+        } )
+    }
+    let dimensions = parse_inner(string).unwrap_or_else(|| {
+        fatal!("Invalid dimensions string '{string}'");
+    });
+    if dimensions.is_zero() {
+        fatal!("Screen dimensions must be greater than zero");
+    }
+    return dimensions;
+}
+
+
+pub fn parse_palette(string: &str) -> [Colour; 16] {
+    fn decode_ascii_hex_digit(ascii: u8) -> Option<u8> {
+        match ascii {
+            b'0'..=b'9' => Some(ascii - b'0'),
+            b'a'..=b'f' => Some(ascii - b'a' + 10),
+            b'A'..=b'F' => Some(ascii - b'A' + 10),
+            _ => { None }
+        }
+    }
+    fn parse_inner(string: &str) -> Option<[Colour; 16]> {
+        let mut c = Vec::new();
+        for token in string.split(',') {
+            let mut bytes = token.bytes();
+            if bytes.len() != 3 { return None; }
+            let r = decode_ascii_hex_digit(bytes.next().unwrap())?;
+            let g = decode_ascii_hex_digit(bytes.next().unwrap())?;
+            let b = decode_ascii_hex_digit(bytes.next().unwrap())?;
+            c.push(Colour::from_rgb(r*17, g*17, b*17));
+        }
+        Some(match c.len() {
+            2 => [ c[0],  c[1],  c[0],  c[1],  c[0],  c[1],  c[0],  c[1],
+                   c[0],  c[1],  c[0],  c[1],  c[0],  c[1],  c[0],  c[1] ],
+            3 => [ c[0],  c[1],  c[0],  c[2],  c[0],  c[1],  c[0],  c[2],
+                   c[0],  c[1],  c[0],  c[2],  c[0],  c[1],  c[0],  c[2] ],
+            4 => [ c[0],  c[1],  c[2],  c[3],  c[0],  c[1],  c[2],  c[3],
+                   c[0],  c[1],  c[2],  c[3],  c[0],  c[1],  c[2],  c[3] ],
+            8 => [ c[0],  c[1],  c[2],  c[3],  c[4],  c[5],  c[6],  c[7],
+                   c[0],  c[1],  c[2],  c[3],  c[4],  c[5],  c[6],  c[7] ],
+           16 => [ c[0],  c[1],  c[2],  c[3],  c[4],  c[5],  c[6],  c[7],
+                   c[8],  c[9], c[10], c[11], c[12], c[13], c[14], c[15] ],
+            _ => return None,
+        })
+    }
+    parse_inner(string).unwrap_or_else(|| {
+        fatal!("Invalid palette string '{string}'");
+    })
+}
+
+
+pub fn parse_metadata_colour(colour: Option<MetadataColour>) -> Option<Colour> {
+    let c = colour?;
+    Some(Colour::from_rgb(c.red, c.green, c.blue))
+}
+
+
+pub fn parse_small_icon(bytes: Option<Vec<u8>>, bg: Colour, fg: Colour) -> Option<Icon> {
+    let rgba = sprite_data_to_rgb(&bytes?, 3, bg, fg);
+    match Icon::from_rgba(rgba, 24, 24) {
+        Ok(icon) => Some(icon),
+        Err(err) => unreachable!("Error while parsing small icon data: {err}"),
+    }
+}
+
+pub fn parse_large_icon(bytes: Option<Vec<u8>>, bg: Colour, fg: Colour) -> Option<Icon> {
+    let rgba = sprite_data_to_rgb(&bytes?, 8, bg, fg);
+    match Icon::from_rgba(rgba, 64, 64) {
+        Ok(icon) => Some(icon),
+        Err(err) => unreachable!("Error while parsing large icon data: {err}"),
+    }
+}
+
+fn sprite_data_to_rgb(bytes: &[u8], size: usize, bg: Colour, fg: Colour) -> Vec<u8> {
+    let sprites: Vec<&[u8]> = bytes.chunks_exact(8).collect();
+    let mut rgba = Vec::new();
+    for sprite_row in 0..size {
+        for pixel_row in 0..8 {
+            for sprite_column in 0..size {
+                let sprite = &sprites[sprite_column + (sprite_row * size)];
+                let row = &sprite[pixel_row];
+                for bit in 0..8 {
+                    let state = row & (0x80 >> bit);
+                    let colour = match state != 0 {
+                        true => fg,
+                        false => bg,
+                    };
+                    rgba.extend_from_slice(&colour.as_rgba_array());
+                }
+            }
+        }
+    }
+    return rgba;
+}