From 9ae7186262181a294fffa32b76a57dc7adec4317 Mon Sep 17 00:00:00 2001
From: Annika Hannig <annika@hannig.cc>
Date: Sun, 25 Sep 2022 23:01:18 +0200
Subject: [PATCH] added luminance support

---
 airportdisplay/src/commands.rs  | 28 ++++++++++++++++++++--------
 airportdisplay/src/geometry.rs  |  7 +++++++
 airportdisplay/src/lib.rs       |  1 +
 airportdisplay/src/luminance.rs |  4 ++++
 airportdisplay/src/protocol.rs  | 19 +++++++++++++++++--
 5 files changed, 49 insertions(+), 10 deletions(-)
 create mode 100644 airportdisplay/src/luminance.rs

diff --git a/airportdisplay/src/commands.rs b/airportdisplay/src/commands.rs
index 2f93b25..c34a8dc 100644
--- a/airportdisplay/src/commands.rs
+++ b/airportdisplay/src/commands.rs
@@ -1,6 +1,9 @@
 use std::convert::From;
 
-use super::text;
+use super::{
+    luminance::Luminance,
+    text::{Buffer as TextBuffer, Raw as TextRaw, Text},
+};
 
 /// Display Commands
 pub enum Command {
@@ -8,21 +11,30 @@ pub enum Command {
     Clear,
     Reboot,
     Fadeout,
-    Text(text::Text),
+    Text(Text),
+    Luminance(Luminance),
 }
 
 /// Directly converty a raw text into a command which
 /// can be sent to the display.
-impl From<text::Raw> for Command {
-    fn from(raw: text::Raw) -> Self {
-        Command::Text(text::Text::Raw(raw))
+impl From<TextRaw> for Command {
+    fn from(raw: TextRaw) -> Self {
+        Command::Text(Text::Raw(raw))
     }
 }
 
 /// Shortcut to directly convert a text buffer into
 /// a commmand which can be sent to the display.
-impl From<text::Buffer> for Command {
-    fn from(buffer: text::Buffer) -> Self {
-        Command::Text(text::Text::Buffer(buffer))
+impl From<TextBuffer> for Command {
+    fn from(buffer: TextBuffer) -> Self {
+        Command::Text(Text::Buffer(buffer))
+    }
+}
+
+/// Shortcut to convert a luminance window
+/// to a command.
+impl From<Luminance> for Command {
+    fn from(luminance: Luminance) -> Self {
+        Command::Luminance(luminance)
     }
 }
diff --git a/airportdisplay/src/geometry.rs b/airportdisplay/src/geometry.rs
index 870c98c..f224732 100644
--- a/airportdisplay/src/geometry.rs
+++ b/airportdisplay/src/geometry.rs
@@ -9,7 +9,14 @@ pub struct Origin(pub u16, pub u16);
 /// Size defines the width and height of a window
 pub struct Size(pub u16, pub u16);
 
+impl Default for Size {
+    fn default() -> Self {
+        Self(1, 1)
+    }
+}
+
 /// A window
+#[derive(Default)]
 pub struct Window(pub Origin, pub Size);
 
 impl Window {
diff --git a/airportdisplay/src/lib.rs b/airportdisplay/src/lib.rs
index 9660a6b..f61d1ab 100644
--- a/airportdisplay/src/lib.rs
+++ b/airportdisplay/src/lib.rs
@@ -1,6 +1,7 @@
 mod commands;
 mod display;
 pub mod geometry;
+pub mod luminance;
 mod protocol;
 pub mod text;
 
diff --git a/airportdisplay/src/luminance.rs b/airportdisplay/src/luminance.rs
new file mode 100644
index 0000000..4c9024b
--- /dev/null
+++ b/airportdisplay/src/luminance.rs
@@ -0,0 +1,4 @@
+use super::geometry::Window;
+
+/// Set luminance of [0..5??] at window
+pub struct Luminance(pub Window, pub u16);
diff --git a/airportdisplay/src/protocol.rs b/airportdisplay/src/protocol.rs
index 6254c0d..7c7a056 100644
--- a/airportdisplay/src/protocol.rs
+++ b/airportdisplay/src/protocol.rs
@@ -5,10 +5,12 @@ use codepage_437::{ToCp437, CP437_WINGDINGS};
 use super::{
     commands::Command,
     geometry::{Origin, Size, Window, COLUMNS, ROWS},
+    luminance::Luminance,
     text,
 };
 
 const CMD_RAW_TEXT: &'static [u8] = &[0x00, 0x03];
+const CMD_RAW_LUM: &'static [u8] = &[0x00, 0x05];
 
 /// A frame holds a single encoded display command,
 /// like set text at pos x, y.
@@ -17,17 +19,21 @@ pub type Frame = Vec<u8>;
 /// Data is a list of commands to be sent to the display.
 pub type Data = Vec<Frame>;
 
+fn encode_u16(v: u16) -> Frame {
+    vec![(v >> 8) as u8, v as u8]
+}
+
 /// Encode position data as big endian
 impl From<Origin> for Frame {
     fn from(Origin(x, y): Origin) -> Self {
-        vec![(x >> 8) as u8, x as u8, (y >> 8) as u8, y as u8]
+        [encode_u16(x), encode_u16(y)].concat()
     }
 }
 
 /// Encode size as big endian
 impl From<Size> for Frame {
     fn from(Size(w, h): Size) -> Self {
-        vec![(w >> 8) as u8, w as u8, (h >> 8) as u8, h as u8]
+        [encode_u16(w), encode_u16(h)].concat()
     }
 }
 
@@ -48,6 +54,14 @@ impl From<text::Raw> for Data {
     }
 }
 
+/// Encode luminance
+impl From<Luminance> for Data {
+    fn from(luminance: Luminance) -> Data {
+        let Luminance(window, value) = luminance;
+        vec![[CMD_RAW_LUM.into(), Vec::from(window), encode_u16(value)].concat()]
+    }
+}
+
 /// Encode a text buffer as a series of commands (data).
 impl From<text::Buffer> for Data {
     fn from(text::Buffer(Origin(x, y), text): text::Buffer) -> Data {
@@ -98,6 +112,7 @@ impl From<Command> for Data {
             Command::Reboot => vec![vec![0x00, 0x0b]],
             Command::Fadeout => vec![vec![0x00, 0x0d]],
             Command::Text(text) => text.into(),
+            Command::Luminance(lum) => lum.into(),
         }
     }
 }