more efficient rendering

src/editor/grid.rs

@@ -1,4 +1,3 @@
-use log::trace;
 use std::sync::Arc;
 
 use super::style::Style;
@@ -8,9 +7,7 @@ pub type GridCell = Option<(String, Option<Arc<Style>>)>;
 pub struct CharacterGrid {
     pub width: u64,
     pub height: u64,
-    pub should_clear: bool,
 
-    dirty: Vec<bool>,
     characters: Vec<GridCell>,
 }
 
@@ -20,17 +17,13 @@ impl CharacterGrid {
         let cell_count = (width * height) as usize;
         CharacterGrid {
             characters: vec![None; cell_count],
-            dirty: vec![true; cell_count],
             width,
             height,
-            should_clear: false,
         }
     }
 
     pub fn resize(&mut self, width: u64, height: u64) {
-        trace!("Editor resized");
         let new_cell_count = (width * height) as usize;
-        let new_dirty = vec![false; new_cell_count];
         let default_cell: GridCell = None;
         let mut new_characters = vec![default_cell; new_cell_count];
 
@@ -44,15 +37,11 @@ impl CharacterGrid {
 
         self.width = width;
         self.height = height;
-        self.dirty = new_dirty;
         self.characters = new_characters;
     }
 
     pub fn clear(&mut self) {
-        trace!("Editor cleared");
         self.set_characters_all(None);
-        self.set_dirty_all(true);
-        self.should_clear = true;
     }
 
     fn cell_index(&self, x: u64, y: u64) -> Option<usize> {
@@ -72,26 +61,6 @@ impl CharacterGrid {
             .map(move |idx| &mut self.characters[idx])
     }
 
-    pub fn is_dirty_cell(&self, x: u64, y: u64) -> bool {
-        if let Some(idx) = self.cell_index(x, y) {
-            self.dirty[idx]
-        } else {
-            false
-        }
-    }
-
-    pub fn set_dirty_cell(&mut self, x: u64, y: u64) {
-        if let Some(idx) = self.cell_index(x, y) {
-            self.dirty[idx] = true;
-        }
-    }
-
-    pub fn set_dirty_all(&mut self, value: bool) {
-        self.dirty.clear();
-        self.dirty
-            .resize_with((self.width * self.height) as usize, || value);
-    }
-
     pub fn set_characters_all(&mut self, value: GridCell) {
         self.characters.clear();
         self.characters
@@ -100,10 +69,12 @@ impl CharacterGrid {
             });
     }
 
-    pub fn rows(&self) -> impl Iterator<Item = &[GridCell]> {
-        (0..self.height).map(move |row| {
-            &self.characters[(row * self.width) as usize..((row + 1) * self.width) as usize]
-        })
+    pub fn row(&self, row_index: u64) -> Option<&[GridCell]> {
+        if row_index < self.height {
+            Some(&self.characters[(row_index * self.width) as usize..((row_index + 1) * self.width) as usize])
+        } else {
+            None
+        }
     }
 }
 
@@ -156,9 +127,7 @@ mod tests {
         let character_grid = CharacterGrid::new(context.size);
         assert_eq!(character_grid.width, context.size.0);
         assert_eq!(character_grid.height, context.size.1);
-        assert_eq!(character_grid.should_clear, true);
         assert_eq!(character_grid.characters, vec![None; context.area]);
-        assert_eq!(character_grid.dirty, vec![true; context.area]);
     }
 
     #[test]
@@ -217,37 +186,6 @@ mod tests {
         );
     }
 
-    #[test]
-    fn test_is_dirty_cell() {
-        let context = Context::new();
-        let mut character_grid = CharacterGrid::new(context.size);
-        character_grid.dirty[context.index] = false;
-
-        // RUN FUNCTION
-        assert!(!character_grid.is_dirty_cell(context.x, context.y));
-    }
-
-    #[test]
-    fn test_set_dirty_cell() {
-        let context = Context::new();
-        let mut character_grid = CharacterGrid::new(context.size);
-        character_grid.dirty = vec![false; context.area];
-
-        // RUN FUNCTION
-        character_grid.set_dirty_cell(context.x, context.y);
-        assert!(character_grid.dirty[context.index]);
-    }
-
-    #[test]
-    fn test_set_dirty_all() {
-        let context = Context::new();
-        let mut character_grid = CharacterGrid::new(context.size);
-
-        // RUN FUNCTION
-        character_grid.set_dirty_all(false);
-        assert_eq!(character_grid.dirty, vec![false; context.area]);
-    }
-
     #[test]
     fn test_set_characters_all() {
         let context = Context::new();
@@ -274,18 +212,14 @@ mod tests {
             "foo".to_string(),
             Some(Arc::new(Style::new(context.none_colors))),
         ));
-        character_grid.dirty = vec![false; context.area];
         character_grid.characters = vec![grid_cell.clone(); context.area];
-        character_grid.should_clear = false;
 
         // RUN FUNCTION
         character_grid.clear();
 
         assert_eq!(character_grid.width, context.size.0);
         assert_eq!(character_grid.height, context.size.1);
-        assert_eq!(character_grid.should_clear, true);
         assert_eq!(character_grid.characters, vec![None; context.area]);
-        assert_eq!(character_grid.dirty, vec![true; context.area]);
     }
 
     #[test]
@@ -302,18 +236,14 @@ mod tests {
             "foo".to_string(),
             Some(Arc::new(Style::new(context.none_colors))),
         ));
-        character_grid.dirty = vec![false; context.area];
         character_grid.characters = vec![grid_cell.clone(); context.area];
-        character_grid.should_clear = false;
 
         // RUN FUNCTION
         character_grid.resize(width, height);
 
         assert_eq!(character_grid.width, width);
         assert_eq!(character_grid.height, height);
-        assert_eq!(character_grid.should_clear, true);
         assert_eq!(character_grid.characters, vec![None; new_area]);
-        assert_eq!(character_grid.dirty, vec![true; new_area]);
     }
 
     #[test]

src/editor/mod.rs

@@ -31,7 +31,6 @@ pub struct WindowRenderInfo {
     pub grid_position: (f64, f64),
     pub width: u64,
     pub height: u64,
-    pub should_clear: bool,
     pub draw_commands: Vec<DrawCommand>
 }
 
@@ -143,7 +142,7 @@ impl Editor {
             RedrawEvent::Clear { grid } => {
                 self.windows
                     .get_mut(&grid)
-                    .map(|window| window.grid.clear());
+                    .map(|window| window.clear());
             }
             RedrawEvent::Destroy { grid } => self.close_window(grid),
             RedrawEvent::Scroll {
@@ -190,12 +189,6 @@ impl Editor {
     }
 
     fn close_window(&mut self, grid: u64) {
-        self.windows
-            .get(&grid)
-            .and_then(|window| window.anchor_grid_id)
-            .and_then(|parent_window_id| self.windows.get_mut(&parent_window_id))
-            .map(|parent_window| parent_window.children.remove(&grid));
-
         self.windows.remove(&grid);
         self.closed_window_ids.insert(grid);
     }
@@ -246,10 +239,6 @@ impl Editor {
         } else {
             error!("Attempted to float window that does not exist.");
         }
-
-        if let Some(anchor_window) = self.windows.get_mut(&anchor_grid) {
-            anchor_window.children.insert(grid);
-        }
     }
 
     fn set_message_position(&mut self, grid: u64, row: u64) {
@@ -271,10 +260,6 @@ impl Editor {
             );
             self.windows.insert(grid, new_window);
         }
-
-        if let Some(parent) = self.windows.get_mut(&1) {
-            parent.children.insert(grid);
-        }
     }
 
     fn get_window_top_left(&self, grid: u64) -> Option<(f64, f64)> {
@@ -339,20 +324,19 @@ impl Editor {
         }
     }
 
-    fn build_window_render_info(&mut self, grid: u64) -> Option<WindowRenderInfo> {
-        let grid_position = self.get_window_top_left(grid)?;
-        let window = self.windows.get_mut(&grid)?;
+    fn build_window_render_info(&mut self, grid_id: u64) -> Option<WindowRenderInfo> {
+        let grid_position = self.get_window_top_left(grid_id)?;
+        let window = self.windows.get_mut(&grid_id)?;
 
-        let (draw_commands, should_clear) = window.build_draw_commands();
+        let draw_commands = window.build_draw_commands();
         let width = window.grid.width;
         let height = window.grid.height;
 
         Some(WindowRenderInfo {
-            grid_id: grid,
+            grid_id,
             grid_position,
             width,
             height,
-            should_clear,
             draw_commands
         })
     }

src/editor/window.rs

@@ -1,7 +1,8 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
 use std::sync::Arc;
+use std::mem::swap;
 
-use log::trace;
+use log::{trace, warn};
 use unicode_segmentation::UnicodeSegmentation;
 
 use super::grid::CharacterGrid;
@@ -9,11 +10,23 @@ use super::style::Style;
 use crate::bridge::{GridLineCell, WindowAnchor};
 
 #[derive(new, Debug, Clone)]
-pub struct DrawCommand {
-    pub text: String,
-    pub cell_width: u64,
-    pub grid_position: (u64, u64),
-    pub style: Option<Arc<Style>>,
+pub enum DrawCommand {
+    Cell {
+        text: String,
+        cell_width: u64,
+        grid_position: (u64, u64),
+        style: Option<Arc<Style>>,
+    },
+    Scroll {
+        top: u64,
+        bot: u64,
+        left: u64,
+        right: u64,
+        rows: i64,
+        cols: i64,
+    },
+    Resize,
+    Clear
 }
 
 pub struct Window {
@@ -24,7 +37,7 @@ pub struct Window {
     pub anchor_type: WindowAnchor,
     pub anchor_row: f64,
     pub anchor_column: f64,
-    pub children: HashSet<u64>,
+    pub queued_draw_commands: Vec<DrawCommand>
 }
 
 impl Window {
@@ -45,12 +58,18 @@ impl Window {
             anchor_column,
             grid: CharacterGrid::new((width, height)),
             hidden: false,
-            children: HashSet::new(),
+            queued_draw_commands: Vec::new()
         }
     }
 
     pub fn resize(&mut self, width: u64, height: u64) {
         self.grid.resize(width, height);
+        self.queued_draw_commands.push(DrawCommand::Resize)
+    }
+
+    pub fn clear(&mut self) {
+        self.grid.clear();
+        self.queued_draw_commands.push(DrawCommand::Clear);
     }
 
     fn draw_grid_line_cell(
@@ -73,23 +92,61 @@ impl Window {
             text = text.repeat(times as usize);
         }
 
+        let mut draw_command_start_index = column_pos.clone();
         if text.is_empty() {
             if let Some(cell) = self.grid.get_cell_mut(*column_pos, row_index) {
                 *cell = Some(("".to_string(), style.clone()));
             }
-
-            self.grid.set_dirty_cell(*column_pos, row_index);
             *column_pos += 1;
         } else {
             for (i, character) in text.graphemes(true).enumerate() {
                 if let Some(cell) = self.grid.get_cell_mut(i as u64 + *column_pos, row_index) {
                     *cell = Some((character.to_string(), style.clone()));
-                    self.grid.set_dirty_cell(*column_pos, row_index);
                 }
             }
             *column_pos += text.graphemes(true).count() as u64;
         }
 
+        let row = self.grid.row(row_index).unwrap();
+        loop {
+            if draw_command_start_index > 0 {
+                if let Some((_, previous_style)) = &row[draw_command_start_index as usize - 1] {
+                    if &style == previous_style {
+                        draw_command_start_index = draw_command_start_index - 1;
+                        continue;
+                    }
+                }
+            }
+            break;
+        }
+
+
+        let mut draw_command_end_index = column_pos.clone() - 1;
+        loop {
+            if draw_command_end_index < self.grid.width - 1 {
+                if let Some((_, next_style)) = &row[draw_command_end_index as usize] {
+                    if &style == next_style {
+                        draw_command_end_index = draw_command_end_index + 1;
+                        continue;
+                    }
+                }
+            }
+            break;
+        }
+
+        let mut text = String::new();
+        for x in draw_command_start_index..draw_command_end_index {
+            let (character, _) = row[x as usize].as_ref().unwrap();
+            text.push_str(character);
+        }
+
+        self.queued_draw_commands.push(DrawCommand::Cell {
+            text,
+            cell_width: draw_command_end_index - draw_command_start_index,
+            grid_position: (draw_command_start_index, row_index),
+            style: style.clone()
+        });
+
         *previous_style = style;
     }
 
@@ -113,7 +170,7 @@ impl Window {
                 );
             }
         } else {
-            println!("Draw command out of bounds");
+            warn!("Draw command out of bounds");
         }
     }
 
@@ -150,114 +207,23 @@ impl Window {
                             self.grid.get_cell_mut(dest_x as u64, dest_y as u64)
                         {
                             *dest_cell = cell_data;
-                            self.grid.set_dirty_cell(dest_x as u64, dest_y as u64);
-                        }
                         }
                     }
                 }
             }
-        trace!("Region scrolled");
         }
 
-    pub fn build_draw_commands(&mut self) -> (Vec<DrawCommand>, bool) {
-        let mut draw_commands = Vec::new();
-
-        for (row_index, row) in self.grid.rows().enumerate() {
-            let mut command = None;
-
-            fn add_command(commands_list: &mut Vec<DrawCommand>, command: Option<DrawCommand>) {
-                if let Some(command) = command {
-                    commands_list.push(command);
-                }
-            }
-
-            fn command_matches(command: &Option<DrawCommand>, style: &Option<Arc<Style>>) -> bool {
-                match command {
-                    Some(command) => &command.style == style,
-                    None => true,
-                }
+        self.queued_draw_commands.push(DrawCommand::Scroll {
+            top, bot, left, right, rows, cols
+        });
     }
 
-            fn add_character(
-                command: &mut Option<DrawCommand>,
-                character: &str,
-                row_index: u64,
-                col_index: u64,
-                style: Option<Arc<Style>>,
-            ) {
-                match command {
-                    Some(command) => {
-                        command.text.push_str(character);
-                        command.cell_width += 1;
-                    }
-                    None => {
-                        command.replace(DrawCommand::new(
-                            character.to_string(),
-                            1,
-                            (col_index, row_index),
-                            style,
-                        ));
-                    }
-                }
-            }
+    pub fn build_draw_commands(&mut self) -> Vec<DrawCommand> {
 
-            for (col_index, cell) in row.iter().enumerate() {
-                if let Some((character, style)) = cell {
-                    if character.is_empty() {
-                        add_character(
-                            &mut command,
-                            &" ",
-                            row_index as u64,
-                            col_index as u64,
-                            style.clone(),
-                        );
-                        add_command(&mut draw_commands, command);
-                        command = None;
-                    } else {
-                        if !command_matches(&command, &style) {
-                            add_command(&mut draw_commands, command);
-                            command = None;
-                        }
-                        add_character(
-                            &mut command,
-                            &character,
-                            row_index as u64,
-                            col_index as u64,
-                            style.clone(),
-                        );
-                    }
-                } else {
-                    if !command_matches(&command, &None) {
-                        add_command(&mut draw_commands, command);
-                        command = None;
-                    }
-                    add_character(&mut command, " ", row_index as u64, col_index as u64, None);
-                }
-            }
-            add_command(&mut draw_commands, command);
-        }
-
-        let should_clear = self.grid.should_clear;
-        let draw_commands = draw_commands
-            .into_iter()
-            .filter(|command| {
-                let (x, y) = command.grid_position;
-                let min = (x as i64 - 1).max(0) as u64;
-                let max = (x + command.cell_width + 1).min(self.grid.width);
-
-                for char_index in min..max {
-                    if self.grid.is_dirty_cell(char_index, y) {
-                        return true;
-                    }
-                }
-                false
-            })
-            .collect::<Vec<DrawCommand>>();
-
-        self.grid.set_dirty_all(false);
-        self.grid.should_clear = false;
+        let mut draw_commands = Vec::new();
+        swap(&mut self.queued_draw_commands, &mut draw_commands);
 
         trace!("Draw commands sent");
-        (draw_commands, should_clear)
+        draw_commands
     }
 }

src/renderer/mod.rs

@@ -4,8 +4,9 @@ use std::sync::Arc;
 use log::trace;
 use skulpin::skia_safe::gpu::SurfaceOrigin;
 use skulpin::skia_safe::{
-    colors, dash_path_effect, Budgeted, Canvas, ImageInfo, Paint, Rect, Surface, Point, Color, image_filters::*
+    colors, dash_path_effect, Budgeted, Canvas, ImageInfo, Paint, Rect, Surface, Point
 };
+use skulpin::skia_safe::canvas::SrcRectConstraint;
 use skulpin::CoordinateSystemHelper;
 
 mod caching_shaper;
@@ -17,7 +18,7 @@ pub use caching_shaper::CachingShaper;
 pub use font_options::*;
 use animation_utils::*;
 
-use crate::editor::{Style, WindowRenderInfo, EDITOR};
+use crate::editor::{Style, WindowRenderInfo, EDITOR, DrawCommand};
 use crate::redraw_scheduler::REDRAW_SCHEDULER;
 use crate::settings::*;
 use cursor_renderer::CursorRenderer;
@@ -266,7 +267,7 @@ impl Renderer {
         &mut self,
         settings: &RendererSettings,
         root_canvas: &mut Canvas,
-        window_render_info: &WindowRenderInfo,
+        window_render_info: WindowRenderInfo,
         default_style: &Arc<Style>,
         dt: f32
     ) -> (u64, Rect) {
@@ -276,45 +277,70 @@ impl Renderer {
         let image_width = (window_render_info.width as f32 * self.font_width) as i32;
         let image_height = (window_render_info.height as f32 * self.font_height) as i32;
 
-        let mut rendered_window = if window_render_info.should_clear {
-            None
-        } else {
-            self.rendered_windows.remove(&window_render_info.grid_id)
-        }
+        let mut rendered_window = self.rendered_windows
+            .remove(&window_render_info.grid_id)
             .unwrap_or_else(|| {
                 let surface = self.build_window_surface(root_canvas, &default_style, (image_width, image_height));
                 RenderedWindow::new(surface, window_destination)
             });
 
-        if rendered_window.surface.width() != image_width || rendered_window.surface.height() != image_height {
-            let mut old_surface = rendered_window.surface;
-            rendered_window.surface = self.build_window_surface(root_canvas, &default_style, (image_width, image_height));
-            old_surface.draw(rendered_window.surface.canvas(), (0.0, 0.0), None);
-        }
-
-        rendered_window.update(settings, window_destination, dt);
-
+        for command in window_render_info.draw_commands.into_iter() {
+            match command {
+                DrawCommand::Cell {
+                    text, cell_width, grid_position, style
+                } => {
                     let mut canvas = rendered_window.surface.canvas();
-
-        for command in window_render_info.draw_commands.iter() {
                     self.draw_background(
                         &mut canvas,
-                command.grid_position,
-                command.cell_width,
-                &command.style,
+                        grid_position,
+                        cell_width,
+                        &style,
                         &default_style,
                     );
-        }
-
-        for command in window_render_info.draw_commands.iter() {
                     self.draw_foreground(
                         &mut canvas,
-                &command.text,
-                command.grid_position,
-                command.cell_width,
-                &command.style,
+                        &text,
+                        grid_position,
+                        cell_width,
+                        &style,
                         &default_style,
                     );
+                },
+                DrawCommand::Scroll {
+                    top, bot, left, right, rows, cols
+                } => {
+                    let scrolled_region = Rect::new(
+                        left as f32 * self.font_width,
+                        top as f32 * self.font_height,
+                        right as f32 * self.font_width,
+                        bot as f32 * self.font_height);
+
+                    let snapshot = rendered_window.surface.image_snapshot();
+                    let canvas = rendered_window.surface.canvas();
+
+                    canvas.save();
+                    canvas.clip_rect(scrolled_region, None, Some(false));
+
+                    let mut translated_region = scrolled_region.clone();
+                    translated_region.offset((-cols as f32 * self.font_width, -rows as f32 * self.font_height));
+
+                    canvas.draw_image_rect(snapshot, Some((&scrolled_region, SrcRectConstraint::Fast)), translated_region, &self.paint);
+
+                    canvas.restore();
+                },
+                DrawCommand::Resize => {
+                    let mut old_surface = rendered_window.surface;
+                    rendered_window.surface = self.build_window_surface(root_canvas, &default_style, (image_width, image_height));
+                    old_surface.draw(rendered_window.surface.canvas(), (0.0, 0.0), None);
+                },
+                DrawCommand::Clear => {
+                    rendered_window.surface = self.build_window_surface(root_canvas, &default_style, (image_width, image_height));
+                }
+            }
+        }
+
+        if rendered_window.update(settings, window_destination, dt) {
+            REDRAW_SCHEDULER.queue_next_frame();
         }
 
         root_canvas.save_layer(&Default::default());
@@ -340,7 +366,6 @@ impl Renderer {
     ) -> bool {
         trace!("Rendering");
 
-        REDRAW_SCHEDULER.queue_next_frame();
         let settings = SETTINGS.get::<RendererSettings>();
 
         let (render_info, default_style, cursor, guifont_setting) = {
@@ -366,7 +391,7 @@ impl Renderer {
         coordinate_system_helper.use_logical_coordinates(gpu_canvas);
 
         self.window_regions = render_info.windows
-            .iter()
+            .into_iter()
             .map(|window_render_info| self.draw_window(&settings, gpu_canvas, window_render_info, &default_style, dt))
             .collect();