Simplify buffer positioning, introduce WLDASH_SCALE

Replace most uses of Buffer::subdimensions with Buffer::offset.

Introduce WLDASH_SCALE. Set to 2 to make wldash render at half size.

README.md

@@ -11,7 +11,7 @@ Consider this alpha-quality: While it works, *everything* is subject to change w
 3. Put somewhere: `cp target/release/wldash /usr/local/bin/wldash`
 4. Run: `wldash`
 
-To display wldash on all outputs, set `WLDASH_ALL_OUTPUTS=1`.
+To display wldash on all outputs, set `WLDASH_ALL_OUTPUTS=1`. To cut size in half, set `WLDASH_SCALE=2`.
 
 ## How to use launcher
 

src/app.rs

@@ -43,10 +43,11 @@ struct AppInner {
     draw_tx: Sender<Cmd>,
     output_mode: OutputMode,
     visible: bool,
+    scale: u32,
 }
 
 impl AppInner {
-    fn new(tx: Sender<Cmd>, output_mode: OutputMode) -> AppInner {
+    fn new(tx: Sender<Cmd>, output_mode: OutputMode, scale: u32) -> AppInner {
         AppInner {
             compositor: None,
             surfaces: Vec::new(),
@@ -58,6 +59,7 @@ impl AppInner {
             draw_tx: tx,
             output_mode: output_mode,
             visible: true,
+            scale: scale,
         }
     }
 
@@ -65,6 +67,7 @@ impl AppInner {
         compositor: &wl_compositor::WlCompositor,
         shell: &zwlr_layer_shell_v1::ZwlrLayerShellV1,
         dimensions: (u32, u32),
+        scale: u32,
         configured_surfaces: Arc<Mutex<usize>>,
         tx: Sender<Cmd>,
         output: Option<&wl_output::WlOutput>,
@@ -99,8 +102,8 @@ impl AppInner {
             .unwrap();
 
         shell_surface.set_keyboard_interactivity(1);
-        shell_surface.set_size(dimensions.0, dimensions.1);
+        shell_surface.set_size(dimensions.0/scale, dimensions.1/scale);
-
+        surface.set_buffer_scale(scale as i32);
         surface.commit();
         (surface, shell_surface)
     }
@@ -134,6 +137,7 @@ impl AppInner {
                         &compositor,
                         &shell,
                         self.dimensions,
+                        self.scale,
                         self.configured_surfaces.clone(),
                         self.draw_tx.clone(),
                         None,
@@ -149,6 +153,7 @@ impl AppInner {
                             &compositor,
                             &shell,
                             self.dimensions,
+                            self.scale,
                             self.configured_surfaces.clone(),
                             self.draw_tx.clone(),
                             Some(&output.1),
@@ -271,10 +276,10 @@ impl App {
         for surface in inner.surfaces.iter() {
             surface.attach(Some(&new_buffer), 0, 0);
             if force {
-                surface.damage(0, 0, buf_x as i32, buf_y as i32);
+                surface.damage_buffer(0, 0, buf_x as i32, buf_y as i32);
             } else {
                 for d in damage.iter() {
-                    surface.damage(d.0, d.1, d.2, d.3);
+                    surface.damage_buffer(d.0, d.1, d.2, d.3);
                 }
             }
             surface.commit();
@@ -332,8 +337,8 @@ impl App {
         None
     }
 
-    pub fn new(tx: Sender<Cmd>, output_mode: OutputMode) -> App {
+    pub fn new(tx: Sender<Cmd>, output_mode: OutputMode, scale: u32) -> App {
-        let inner = Arc::new(Mutex::new(AppInner::new(tx.clone(), output_mode)));
+        let inner = Arc::new(Mutex::new(AppInner::new(tx.clone(), output_mode, scale)));
 
         //
         // Set up modules
@@ -527,7 +532,7 @@ impl App {
                         surface_y,
                         ..
                     } => {
-                        pos = (surface_x as u32, surface_y as u32);
+                        pos = (surface_x as u32 * scale, surface_y as u32 * scale);
                     }
                     wl_pointer::Event::Axis { axis, value, .. } => {
                         if axis == wl_pointer::Axis::VerticalScroll {

src/buffer.rs

@@ -67,6 +67,35 @@ impl<'a> Buffer<'a> {
         })
     }
 
+    pub fn offset(
+        &mut self,
+        offset: (u32, u32),
+    ) -> Result<Buffer, ::std::io::Error> {
+        let bounds = self.get_bounds();
+        if offset.0 > bounds.2
+            || offset.1 > bounds.3
+        {
+            return Err(::std::io::Error::new(
+                ::std::io::ErrorKind::Other,
+                format!(
+                    "cannot create offset outside buffer: {:?} > {:?}",
+                    offset, bounds
+                ),
+            ));
+        }
+
+        Ok(Buffer {
+            buf: self.buf,
+            dimensions: self.dimensions,
+            subdimensions: Some((
+                offset.0 + bounds.0,
+                offset.1 + bounds.1,
+                bounds.2 - offset.0,
+                bounds.3 - offset.1,
+            )),
+        })
+    }
+
     pub fn memset(&mut self, c: &Color) {
         if let Some(subdim) = self.subdimensions {
             unsafe {

src/draw.rs

@@ -230,8 +230,6 @@ impl Font {
 }
 
 pub fn draw_box(buf: &mut Buffer, c: &Color, dim: (u32, u32)) -> Result<(), ::std::io::Error> {
-    let mut buf = buf.subdimensions((0, 0, dim.0, dim.1))?;
-
     for x in 0..dim.0 {
         let _ = buf.put((x, 0), c);
         let _ = buf.put((x, dim.1 - 1), c);
@@ -251,8 +249,6 @@ pub fn draw_bar(
     height: u32,
     fill: f32,
 ) -> Result<(), ::std::io::Error> {
-    let mut buf = buf.subdimensions((0, 0, length, height))?;
-
     let mut fill_pos = ((length as f32) * fill) as u32;
     if fill_pos > length {
         fill_pos = length;

src/main.rs

@@ -29,6 +29,10 @@ fn main() {
         Ok(dir) => dir + "/wldash",
         Err(_) => "/tmp/wldash".to_string(),
     };
+    let scale = match env::var("WLDASH_SCALE") {
+        Ok(s) => s.parse().unwrap(),
+        Err(_) => 1,
+    };
 
     let args: Vec<String> = env::args().collect();
     let mode = match args.len() {
@@ -84,7 +88,7 @@ fn main() {
         Err(_) => OutputMode::Active,
     };
 
-    let mut app = App::new(tx_draw, output_mode);
+    let mut app = App::new(tx_draw, output_mode, scale);
     app.wipe();
 
     let worker_queue = app.cmd_queue();

src/modules/backlight.rs

@@ -108,19 +108,19 @@ impl ModuleImpl for Backlight {
         buf.memset(bg);
         let c = Color::new(1.0, 1.0, 1.0, 1.0);
         self.font.draw_text(
-            &mut buf.subdimensions((0, 0, 128, 24))?,
+            buf,
             bg,
             &c,
             "backlight",
         )?;
         draw_bar(
-            &mut buf.subdimensions((128, 0, 464, 24))?,
+            &mut buf.offset((128, 0))?,
             &c,
             464,
             24,
             self.brightness(),
         )?;
-        draw_box(&mut buf.subdimensions((128, 0, 464, 24))?, &c, (464, 24))?;
+        draw_box(&mut buf.offset((128, 0))?, &c, (464, 24))?;
         Ok(vec![buf.get_signed_bounds()])
     }
 

src/modules/battery.rs

@@ -214,13 +214,13 @@ impl ModuleImpl for UpowerBattery {
         };
 
         self.font.draw_text(
-            &mut buf.subdimensions((0, 0, 128, 24))?,
+            &mut buf.offset((0, 0))?,
             bg,
             &text_color,
             "battery",
         )?;
         draw_bar(
-            &mut buf.subdimensions((128, 0, 464, 24))?,
+            &mut buf.offset((128, 0))?,
             &bar_color,
             464,
             24,
@@ -228,7 +228,7 @@ impl ModuleImpl for UpowerBattery {
         )?;
 
         draw_box(
-            &mut buf.subdimensions((128, 0, 464, 24))?,
+            &mut buf.offset((128, 0))?,
             &bar_color,
             (464, 24),
         )?;

src/modules/calendar.rs

@@ -48,14 +48,14 @@ impl Calendar {
         //
 
         self.month_cache.draw_text(
-            &mut buf.subdimensions((0, 0, 304, 72))?,
+            buf,
             background_color,
             &Color::new(1.0, 1.0, 1.0, 1.0),
             month_str,
         )?;
         if time.year() != orig.year() {
             self.year_cache.draw_text(
-                &mut buf.subdimensions((320, 0, 48, 32))?,
+                &mut buf.offset((320, 0))?,
                 background_color,
                 &Color::new(0.8, 0.8, 0.8, 1.0),
                 &format!("{:}", time.year()),
@@ -79,7 +79,7 @@ impl Calendar {
             };
 
             self.day_cache.draw_text(
-                &mut buf.subdimensions((idx * 48 + 4, (y_off * 32) + 64, 24, 16))?,
+                &mut buf.offset((idx * 48 + 4, (y_off * 32) + 64))?,
                 background_color,
                 &Color::new(1.0, 1.0, 1.0, 1.0),
                 &wk_chr,
@@ -105,7 +105,7 @@ impl Calendar {
             //
             let wk = time.iso_week();
             self.calendar_cache.draw_text(
-                &mut buf.subdimensions((0 * 48, (y_off * 32) + 64, 32, 32))?,
+                &mut buf.offset((0 * 48, (y_off * 32) + 64))?,
                 background_color,
                 &Color::new(0.75, 0.75, 0.75, 1.0),
                 &format!("{:02}", wk.week()),
@@ -123,7 +123,7 @@ impl Calendar {
                 };
 
                 self.calendar_cache.draw_text(
-                    &mut buf.subdimensions((x_pos * 48, (y_off * 32) + 64, 32, 32))?,
+                    &mut buf.offset((x_pos * 48, (y_off * 32) + 64))?,
                     background_color,
                     &c,
                     &format!("{:02}", time.day()),
@@ -195,13 +195,13 @@ impl ModuleImpl for Calendar {
                 .unwrap();
         }
         self.draw_month(
-            &mut buf.subdimensions((0, 0, 368, 320))?,
+            &mut buf.offset((0, 0))?,
             background_color,
             &time,
             &t.pred().with_day(1).unwrap(),
         )?;
         self.draw_month(
-            &mut buf.subdimensions((432, 0, 368, 320))?,
+            &mut buf.offset((432, 0))?,
             background_color,
             &time,
             &t,
@@ -212,7 +212,7 @@ impl ModuleImpl for Calendar {
             t.with_month(t.month() + 1).unwrap()
         };
         self.draw_month(
-            &mut buf.subdimensions((864, 0, 368, 320))?,
+            &mut buf.offset((864, 0))?,
             background_color,
             &time,
             &n,

src/modules/clock.rs

@@ -58,7 +58,7 @@ impl ModuleImpl for Clock {
         buf.memset(bg);
 
         self.date_cache.draw_text(
-            &mut buf.subdimensions((0, 0, 240 * 2 + 56, 64))?,
+            buf,
             bg,
             &Color::new(1.0, 1.0, 1.0, 1.0),
             &format!(
@@ -71,7 +71,7 @@ impl ModuleImpl for Clock {
         )?;
 
         self.clock_cache.draw_text_fixed_width(
-            &mut buf.subdimensions((0, 64, 240 * 2 + 56, 256))?,
+            &mut buf.offset((0, 64))?,
             bg,
             &Color::new(1.0, 1.0, 1.0, 1.0),
             &[120, 120, 56, 120, 120],

src/modules/launcher.rs

@@ -73,7 +73,7 @@ impl Launcher {
                 Color::new(1.0, 1.0, 1.0, 1.0)
             };
             let dim = self.font.borrow_mut().auto_draw_text(
-                &mut buf.subdimensions((0, 0, 1232, 32))?,
+                buf,
                 bg,
                 &c,
                 &self.input,
@@ -86,7 +86,7 @@ impl Launcher {
 
         let mut width_remaining: i32 = 1232 - x_off as i32;
         for (idx, m) in self.matches.iter().enumerate() {
-            let mut b = match buf.subdimensions((x_off, 0, width_remaining as u32, 32)) {
+            let mut b = match buf.offset((x_off, 0)) {
                 Ok(b) => b,
                 Err(_) => break,
             };
@@ -135,7 +135,7 @@ impl Launcher {
             .font
             .borrow_mut()
             .auto_draw_text(
-                &mut buf.subdimensions((0, 0, 1232, 32))?,
+                buf,
                 bg,
                 &Color::new(1.0, 1.0, 0.0, 1.0),
                 "=",
@@ -145,7 +145,7 @@ impl Launcher {
 
         let x_off = if self.input.len() > 0 {
             let dim = self.font.borrow_mut().auto_draw_text(
-                &mut buf.subdimensions((x_off, 0, 1232 - x_off, 32))?,
+                &mut buf.offset((x_off, 0))?,
                 bg,
                 &Color::new(1.0, 1.0, 1.0, 1.0),
                 &self.input[1..],
@@ -158,7 +158,7 @@ impl Launcher {
 
         if let Some(result) = &self.result {
             self.font.borrow_mut().auto_draw_text(
-                &mut buf.subdimensions((x_off, 0, 1232 - x_off, 32))?,
+                &mut buf.offset((x_off, 0))?,
                 bg,
                 &Color::new(0.75, 0.75, 0.75, 1.0),
                 &format!(" = {:}", result),
@@ -179,7 +179,7 @@ impl Launcher {
             .font
             .borrow_mut()
             .auto_draw_text(
-                &mut buf.subdimensions((0, 0, 1232, 32))?,
+                &mut buf.offset((0, 0))?,
                 bg,
                 &Color::new(1.0, 1.0, 0.0, 1.0),
                 "!",
@@ -189,7 +189,7 @@ impl Launcher {
 
         if self.input.len() > 0 {
             self.font.borrow_mut().auto_draw_text(
-                &mut buf.subdimensions((x_off, 0, 1232 - x_off, 32))?,
+                &mut buf.offset((x_off, 0))?,
                 bg,
                 &Color::new(1.0, 1.0, 1.0, 1.0),
                 &self.input[1..],

src/modules/sound.rs

@@ -487,20 +487,20 @@ impl ModuleImpl for PulseAudio {
             Color::new(1.0, 1.0, 1.0, 1.0)
         };
         self.font.draw_text(
-            &mut buf.subdimensions((0, 0, 128, 24))?,
+            buf,
             bg,
             &Color::new(1.0, 1.0, 1.0, 1.0),
             "volume",
         )?;
-        draw_bar(&mut buf.subdimensions((128, 0, 464, 24))?, &c, 464, 24, vol)?;
+        draw_bar(&mut buf.offset((128, 0))?, &c, 464, 24, vol)?;
         let mut iter = 1.0;
         while vol > 1.0 {
             let c = &Color::new(0.75 / iter, 0.25 / iter, 0.25 / iter, 1.0);
             vol -= 1.0;
             iter += 1.0;
-            draw_bar(&mut buf.subdimensions((128, 0, 464, 24))?, &c, 464, 24, vol)?;
+            draw_bar(&mut buf.offset((128, 0))?, &c, 464, 24, vol)?;
         }
-        draw_box(&mut buf.subdimensions((128, 0, 464, 24))?, &c, (464, 24))?;
+        draw_box(&mut buf.offset((128, 0))?, &c, (464, 24))?;
         Ok(vec![buf.get_signed_bounds()])
     }