pango_itemize/pango_shape

Cargo.lock

@@ -9,6 +9,7 @@ dependencies = [
  "gio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glib 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "glib-sys 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gtk 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gtk-sys 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "htmlescape 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -14,6 +14,7 @@ glib-sys = "0.4"
 gdk = "0.6"
 gdk-sys = "0.4"
 gio = "0.2"
+gobject-sys = "0.4"
 #gdk = { git = 'https://github.com/gtk-rs/gdk' }
 #gdk-sys = { git = 'https://github.com/gtk-rs/sys' }
 #glib = { git = 'https://github.com/gtk-rs/glib' }

src/main.rs

@@ -6,6 +6,7 @@ extern crate gdk_sys;
 #[macro_use]
 extern crate glib;
 extern crate glib_sys as glib_ffi;
+extern crate gobject_sys as gobject_ffi;
 extern crate cairo;
 extern crate pango;
 extern crate pango_sys;

src/render/context.rs

@@ -14,16 +14,14 @@ pub struct Context {
 
 impl Context {
     pub fn new(font_desc: &pango::FontDescription) -> Self {
-        Context { 
-            pango_context: create_pango_context(font_desc),
-        }
+        Context { pango_context: create_pango_context(font_desc) }
     }
 
     pub fn update(&mut self, font_desc: &pango::FontDescription) {
         self.pango_context = create_pango_context(font_desc);
     }
 
-    pub fn itemize(&self, line: &StyledLine)-> Vec<item::Item> {
+    pub fn itemize(&self, line: &StyledLine) -> Vec<item::Item> {
         pango_itemize(&self.pango_context, &line.line_str, &line.attr_list)
     }
 }

src/render/mod.rs

@@ -8,23 +8,80 @@ use pangocairo::{CairoContextExt, FontMap};
 use std::ffi::CString;
 use ui_model;
 
-pub fn render(ctx: &cairo::Context, font_desc: pango::FontDescription) {
-    let font_map = FontMap::get_default();
-    let pango_context = font_map.create_context().unwrap();
-    pango_context.set_font_description(&font_desc);
+pub fn render(
+    ctx: &cairo::Context,
+    font_desc: pango::FontDescription,
+    ui_model: &mut ui_model::UiModel,
+) {
+    let font_ctx = context::Context::new(&font_desc);
 
-    let text = "TEST String".to_owned();
-    let attr_list = pango::AttrList::new();
+    shape_dirty(&font_ctx, ui_model);
 
-    ctx.move_to(0.0, 50.0);
-    let items = pango_itemize(&pango_context, &text, &attr_list);
-    for item in items {
-        let mut glyphs = pango::GlyphString::new();
-        let analysis = item.analysis();
-        pango_shape(&text, &analysis, &mut glyphs);
-        let font = analysis.font();
-        let (ink, logical) = glyphs.extents(&font);
-        ctx.show_glyph_string(&font, &glyphs);
+
+    for line in ui_model.model_mut() {
+        for i in 0..line.line.len() {
+            let item = line.item_line[i].as_ref();
+            if let Some(item) = item {
+                if let Some(ref glyphs) = item.glyphs {
+                    let analysis = item.item.analysis();
+                    let font = analysis.font();
+                    ctx.show_glyph_string(&font, glyphs);
+                }
+            }
+        }
     }
 }
 
+fn shape_dirty(ctx: &context::Context, ui_model: &mut ui_model::UiModel) {
+    for line in ui_model.model_mut() {
+        if line.dirty_line {
+            let styled_line = ui_model::StyledLine::from(line);
+            let items = ctx.itemize(&styled_line);
+            line.merge(&styled_line, &items);
+
+            for i in 0..line.line.len() {
+                if line[i].dirty {
+                    let mut item = line.get_item_mut(i).unwrap();
+                    let mut glyphs = pango::GlyphString::new();
+                    {
+                        let analysis = item.item.analysis();
+                        let (offset, length, _) = item.item.offset();
+                        pango_shape(
+                            &styled_line.line_str,
+                            offset,
+                            length,
+                            &analysis,
+                            &mut glyphs,
+                        );
+                    }
+
+                    item.set_glyphs(glyphs);
+                }
+
+                line[i].dirty = false;
+            }
+
+            line.dirty_line = false;
+        }
+    }
+}
+
+//pub fn render_test(ctx: &cairo::Context, font_desc: pango::FontDescription) {
+//let font_map = FontMap::get_default();
+//let pango_context = font_map.create_context().unwrap();
+//pango_context.set_font_description(&font_desc);
+
+//let text = "TEST String".to_owned();
+//let attr_list = pango::AttrList::new();
+
+//ctx.move_to(0.0, 50.0);
+//let items = pango_itemize(&pango_context, &text, &attr_list);
+//for item in items {
+//let mut glyphs = pango::GlyphString::new();
+//let analysis = item.analysis();
+//pango_shape(&text, &analysis, &mut glyphs);
+//let font = analysis.font();
+//let (ink, logical) = glyphs.extents(&font);
+//ctx.show_glyph_string(&font, &glyphs);
+//}
+//}

src/shell.rs

@@ -621,31 +621,30 @@ fn update_line_metrics(state_arc: &Arc<UiMutex<State>>, ctx: &cairo::Context) {
 }
 
 fn gtk_draw(state_arc: &Arc<UiMutex<State>>, ctx: &cairo::Context) -> Inhibit {
-    //update_line_metrics(state_arc, ctx);
+    update_line_metrics(state_arc, ctx);
 
-    //if state_arc.borrow_mut().request_nvim_resize {
-    //    try_nvim_resize(state_arc);
-    //}
+    if state_arc.borrow_mut().request_nvim_resize {
+        try_nvim_resize(state_arc);
+    }
 
-    //init_nvim(state_arc);
-
-    //let mut state = state_arc.borrow_mut();
-    //if state.nvim.borrow().is_initialized() {
-    //    draw(&*state, ctx);
-    //    request_window_resize(&mut *state);
-    //} else if state.nvim.borrow().is_initializing() {
-    //    draw_initializing(&*state, ctx);
-    //}
+    init_nvim(state_arc);
 
     let mut state = state_arc.borrow_mut();
-    render(&*state, ctx);
+    if state.nvim.borrow().is_initialized() {
+        // draw(&*state, ctx);
+        render(&mut *state, ctx);
+        request_window_resize(&mut *state);
+    } else if state.nvim.borrow().is_initializing() {
+        draw_initializing(&*state, ctx);
+    }
+
     Inhibit(false)
 }
 
-fn render(state: &State, ctx: &cairo::Context) {
+fn render(state: &mut State, ctx: &cairo::Context) {
     let font_desc = state.create_pango_font();
 
-    render::render(ctx, font_desc);
+    render::render(ctx, font_desc, &mut state.model);
 }
 
 fn show_nvim_start_error(err: nvim::NvimInitError, state_arc: Arc<UiMutex<State>>) {

src/sys/pango/item.rs

@@ -4,6 +4,7 @@ use std::mem;
 use pango_sys;
 
 use glib_ffi;
+use gobject_ffi;
 use glib::translate::*;
 
 use super::analysis;
@@ -14,6 +15,7 @@ glib_wrapper! {
     match fn {
         copy => |ptr| pango_sys::pango_item_copy(ptr as *mut pango_sys::PangoItem),
         free => |ptr| pango_sys::pango_item_free(ptr),
+        get_type => || pango_sys::pango_item_get_type(),
     }
 }
 
@@ -21,4 +23,8 @@ impl Item {
     pub fn analysis(&self) -> analysis::Analysis {
         analysis::Analysis::from(&self.0.analysis)
     }
+
+    pub fn offset(&self) -> (usize, usize, usize) {
+        (self.0.offset as usize, self.0.length as usize, self.0.num_chars as usize)
+    }
 }

src/sys/pango/mod.rs

@@ -2,7 +2,6 @@ pub mod item;
 mod analysis;
 
 use std::ptr;
-use std::ffi::CStr;
 
 use pango;
 use pango_sys;
@@ -28,13 +27,17 @@ pub fn pango_itemize(
 
 pub fn pango_shape(
     text: &String,
+    offset: usize,
+    length: usize,
     analysis: &analysis::Analysis,
     glyphs: &mut pango::GlyphString,
 ) {
+    debug_assert!(offset + length <= text.len());
+
     unsafe {
         pango_sys::pango_shape(
-            text.as_ptr() as *const i8,
-            text.len() as i32,
+            (text.as_ptr() as *const i8).offset(offset as isize),
+            length as i32,
             analysis.to_glib_ptr(),
             glyphs.to_glib_none_mut().0,
         );

src/ui_model/cell.rs

@@ -43,15 +43,17 @@ impl Attrs {
 
 #[derive(Clone)]
 pub struct Cell {
-    pub ch: char,
     pub attrs: Attrs,
+    pub ch: char,
+    pub dirty: bool,
 }
 
 impl Cell {
     pub fn new(ch: char) -> Cell {
         Cell {
-            ch: ch,
             attrs: Attrs::new(),
+            ch: ch,
+            dirty: false,
         }
     }
 

src/ui_model/line.rs

@@ -1,26 +1,42 @@
 use std::ops::{Index, IndexMut};
 
 use super::cell::Cell;
+use sys::pango::item as sys_pango;
 use pango;
 
 pub struct Item {
-    item: pango::Item,
-    glyph_string: Option<pango::GlyphString>,
+    pub item: sys_pango::Item,
+    pub glyphs: Option<pango::GlyphString>,
 }
 
 impl Item {
-    pub fn new(item: pango::Item) -> Self {
+    pub fn new(item: sys_pango::Item) -> Self {
         Item {
             item,
-            glyph_string: None,
+            glyphs: None,
         }
     }
+
+    pub fn update(&mut self, item: sys_pango::Item) {
+        self.item = item;
+        self.glyphs = None;
+    }
+
+    pub fn set_glyphs(&mut self, glyphs: pango::GlyphString) {
+        self.glyphs = Some(glyphs);
+    }
 }
 
 pub struct Line {
     pub line: Box<[Cell]>,
-    item_line: Option<Box<[Item]>>,
-    cell_to_item: Box<[usize]>,
+
+    // format of item line is
+    // [Item1, Item2, None, None, Item3]
+    // Item2 take 3 cells and renders as one
+    pub item_line: Box<[Option<Item>]>,
+
+    item_line_empty: bool,
+    pub dirty_line: bool,
 }
 
 impl Line {
@@ -29,11 +45,16 @@ impl Line {
         for _ in 0..columns {
             line.push(Cell::new(' '));
         }
+        let mut item_line = Vec::with_capacity(columns);
+        for _ in 0..columns {
+            item_line.push(None);
+        }
 
         Line {
-            cell_to_item: Vec::with_capacity(line.len()).into_boxed_slice(),
             line: line.into_boxed_slice(),
-            item_line: None,
+            item_line: item_line.into_boxed_slice(),
+            dirty_line: false,
+            item_line_empty: true,
         }
     }
 
@@ -41,7 +62,63 @@ impl Line {
         for cell in &mut self.line[left..right + 1] {
             cell.clear();
         }
+    }
 
+    pub fn merge(&mut self, old_items: &StyledLine, new_items: &[sys_pango::Item]) {
+        for new_item in new_items {
+            let (offset, length, _) = new_item.offset();
+            let start_cell = old_items.cell_to_byte[offset];
+            let end_cell = old_items.cell_to_byte[offset + length - 1];
+
+            // first time initialization
+            // as cell_to_item is to slow in this case
+            if !self.item_line_empty {
+                let start_item = self.cell_to_item(start_cell);
+                let end_item = self.cell_to_item(end_cell);
+
+                // in case different item length was in previous iteration
+                // mark all item as dirty
+                if start_item != end_item {
+                    self.initialize_cells(start_cell, end_cell, new_item);
+                } else {
+                    self.item_line[offset].as_mut().unwrap().update(
+                        new_item.clone(),
+                    );
+                }
+            } else {
+                self.initialize_cells(start_cell, end_cell, new_item);
+            }
+        }
+
+        self.item_line_empty = false;
+    }
+
+    fn initialize_cells(&mut self, start_cell: usize, end_cell: usize, new_item: &sys_pango::Item) {
+        for i in start_cell..end_cell {
+            self.line[i].dirty = true;
+        }
+        for i in start_cell + 1..end_cell {
+            self.item_line[i] = None;
+        }
+        self.item_line[start_cell] = Some(Item::new(new_item.clone()));
+    }
+
+    pub fn mark_dirty_cell(&mut self, idx: usize) {
+        self.line[idx].dirty = true;
+    }
+
+    pub fn get_item_mut(&mut self, cell_idx: usize) -> Option<&mut Item> {
+        self.item_line[ self.cell_to_item(cell_idx) ].as_mut()
+    }
+
+    fn cell_to_item(&self, cell_idx: usize) -> usize {
+        for i in (cell_idx..0).rev() {
+            if self.item_line[i].is_some() {
+                return i;
+            }
+        }
+
+        unreachable!();
     }
 }
 
@@ -80,11 +157,16 @@ impl StyledLine {
             line_str.push(cell.ch);
             let len = line_str.len();
 
-            for i in byte_offset..byte_offset + len {
+            for _ in byte_offset..byte_offset + len {
                 cell_to_byte.push(cell_idx);
             }
 
-            insert_attrs(cell, &attr_list, byte_offset as u32, (byte_offset + len) as u32);
+            insert_attrs(
+                cell,
+                &attr_list,
+                byte_offset as u32,
+                (byte_offset + len) as u32,
+            );
 
             byte_offset += len;
         }

src/ui_model/mod.rs

@@ -22,7 +22,7 @@ pub struct UiModel {
 impl UiModel {
     pub fn new(rows: u64, columns: u64) -> UiModel {
         let mut model = Vec::with_capacity(rows as usize);
-        for i in 0..rows as usize {
+        for _ in 0..rows as usize {
             model.push(Line::new(columns as usize));
         }
 
@@ -43,6 +43,10 @@ impl UiModel {
         &self.model
     }
 
+    pub fn model_mut(&mut self) -> &mut [Line] {
+        &mut self.model
+    }
+
     pub fn limit_to_model(&self, clip: &mut ModelRect) {
         clip.left = if clip.left >= self.columns {
             self.columns - 1
@@ -92,7 +96,11 @@ impl UiModel {
 
     pub fn put(&mut self, text: &str, attrs: Option<&Attrs>) -> ModelRect {
         let mut changed_region = self.cur_point();
-        let mut cell = &mut self.model[self.cur_row][self.cur_col];
+        let mut line = &mut self.model[self.cur_row];
+        line.dirty_line = true;
+        line.mark_dirty_cell(self.cur_col);
+
+        let mut cell = &mut line[self.cur_col];
 
         cell.ch = text.chars().last().unwrap_or(' ');
         cell.attrs = attrs.map(Attrs::clone).unwrap_or_else(Attrs::new);