Split alacritty into a separate crates

The crate containing the entry point is called alacritty, and the crate
containing everything else is called alacritty_terminal.

1 files changed, 156 insertions, 0 deletions

diff --git a/alacritty_terminal/src/renderer/rects.rs b/alacritty_terminal/src/renderer/rects.rs
new file mode 100644
index 00000000..b4f8a012
--- /dev/null
+++ b/alacritty_terminal/src/renderer/rects.rs
@@ -0,0 +1,156 @@
+// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+use font::Metrics;
+
+use crate::index::Point;
+use crate::term::cell::Flags;
+use crate::term::color::Rgb;
+use crate::term::{RenderableCell, SizeInfo};
+
+#[derive(Debug, Copy, Clone)]
+pub struct Rect<T> {
+    pub x: T,
+    pub y: T,
+    pub width: T,
+    pub height: T,
+}
+
+impl<T> Rect<T> {
+    pub fn new(x: T, y: T, width: T, height: T) -> Self {
+        Rect { x, y, width, height }
+    }
+}
+
+#[derive(Debug)]
+struct Line {
+    flag: Flags,
+    range: Option<(RenderableCell, Point)>,
+}
+
+impl Line {
+    fn new(flag: Flags) -> Self {
+        Self { flag, range: None }
+    }
+}
+
+/// Rects for underline, strikeout and more.
+pub struct Rects<'a> {
+    inner: Vec<(Rect<f32>, Rgb)>,
+    active_lines: Vec<Line>,
+    metrics: &'a Metrics,
+    size: &'a SizeInfo,
+}
+
+impl<'a> Rects<'a> {
+    pub fn new(metrics: &'a Metrics, size: &'a SizeInfo) -> Self {
+        let active_lines = vec![Line::new(Flags::UNDERLINE), Line::new(Flags::STRIKEOUT)];
+        Self { inner: Vec::new(), active_lines, metrics, size }
+    }
+
+    /// Convert the stored rects to rectangles for the renderer.
+    pub fn rects(&self) -> &Vec<(Rect<f32>, Rgb)> {
+        &self.inner
+    }
+
+    /// Update the stored lines with the next cell info.
+    pub fn update_lines(&mut self, size_info: &SizeInfo, cell: &RenderableCell) {
+        for line in self.active_lines.iter_mut() {
+            match line.range {
+                // Check for end if line is present
+                Some((ref mut start, ref mut end)) => {
+                    // No change in line
+                    if cell.line == start.line
+                        && cell.flags.contains(line.flag)
+                        && cell.fg == start.fg
+                        && cell.column == end.col + 1
+                    {
+                        if size_info.cols() == cell.column && size_info.lines() == cell.line {
+                            // Add the last rect if we've reached the end of the terminal
+                            self.inner.push(create_rect(
+                                &start,
+                                cell.into(),
+                                line.flag,
+                                &self.metrics,
+                                &self.size,
+                            ));
+                        } else {
+                            // Update the length of the line
+                            *end = cell.into();
+                        }
+
+                        continue;
+                    }
+
+                    self.inner.push(create_rect(start, *end, line.flag, &self.metrics, &self.size));
+
+                    // Start a new line if the flag is present
+                    if cell.flags.contains(line.flag) {
+                        *start = cell.clone();
+                        *end = cell.into();
+                    } else {
+                        line.range = None;
+                    }
+                },
+                // Check for new start of line
+                None => {
+                    if cell.flags.contains(line.flag) {
+                        line.range = Some((cell.clone(), cell.into()));
+                    }
+                },
+            };
+        }
+    }
+
+    // Add a rectangle
+    pub fn push(&mut self, rect: Rect<f32>, color: Rgb) {
+        self.inner.push((rect, color));
+    }
+}
+
+/// Create a rectangle that starts on the left of `start` and ends on the right
+/// of `end`, based on the given flag and size metrics.
+fn create_rect(
+    start: &RenderableCell,
+    end: Point,
+    flag: Flags,
+    metrics: &Metrics,
+    size: &SizeInfo,
+) -> (Rect<f32>, Rgb) {
+    let start_x = start.column.0 as f32 * size.cell_width;
+    let end_x = (end.col.0 + 1) as f32 * size.cell_width;
+    let width = end_x - start_x;
+
+    let (position, mut height) = match flag {
+        Flags::UNDERLINE => (metrics.underline_position, metrics.underline_thickness),
+        Flags::STRIKEOUT => (metrics.strikeout_position, metrics.strikeout_thickness),
+        _ => unimplemented!("Invalid flag for cell line drawing specified"),
+    };
+
+    // Make sure lines are always visible
+    height = height.max(1.);
+
+    let cell_bottom = (start.line.0 as f32 + 1.) * size.cell_height;
+    let baseline = cell_bottom + metrics.descent;
+
+    let mut y = baseline - position - height / 2.;
+    let max_y = cell_bottom - height;
+    if y > max_y {
+        y = max_y;
+    }
+
+    let rect =
+        Rect::new(start_x + size.padding_x, y.round() + size.padding_y, width, height.round());
+
+    (rect, start.fg)
+}