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Combine both simple and word wrapping into one layout function

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This commit is contained in:
Jeremy Soller 2022-10-26 20:10:38 -06:00
parent 5d1aa8b814
commit 87c12b11ae
2 changed files with 36 additions and 86 deletions
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24
src/buffer.rs
View file

@ -212,21 +212,15 @@ impl<'a> TextBufferLine<'a> {
pub fn layout(&mut self, font_system: &'a FontSystem<'a>, font_size: i32, width: i32) -> &[LayoutLine] {
if self.layout_opt.is_none() {
let mut layout = Vec::new();
if self.wrap_simple {
self.shape(font_system).layout_simple(
font_size,
width,
&mut layout,
0,
);
} else {
self.shape(font_system).layout(
font_size,
width,
&mut layout,
0,
);
}
let wrap_simple = self.wrap_simple;
let shape = self.shape(font_system);
shape.layout(
font_size,
width,
&mut layout,
0,
wrap_simple
);
self.layout_opt = Some(layout);
}
self.layout_opt.as_ref().unwrap()

98
src/shape.rs
View file

@ -472,79 +472,13 @@ impl ShapeLine {
Self { rtl, spans }
}
//TODO: combine with layout function
pub fn layout_simple(
&self,
font_size: i32,
line_width: i32,
layout_lines: &mut Vec<LayoutLine>,
mut layout_i: usize,
) {
let mut push_line = true;
let mut glyphs = Vec::new();
let start_x = if self.rtl { line_width as f32 } else { 0.0 };
let end_x = if self.rtl { 0.0 } else { line_width as f32 };
let mut x = start_x;
let mut y = 0.0;
for span in self.spans.iter() {
for word in span.words.iter() {
for glyph in word.glyphs.iter() {
let x_advance = font_size as f32 * glyph.x_advance;
let y_advance = font_size as f32 * glyph.y_advance;
let wrap = if self.rtl {
x - x_advance < end_x
} else {
x + x_advance > end_x
};
if wrap {
let mut glyphs_swap = Vec::new();
std::mem::swap(&mut glyphs, &mut glyphs_swap);
layout_lines.insert(
layout_i,
LayoutLine {
glyphs: glyphs_swap,
},
);
layout_i += 1;
x = start_x;
y = 0.0;
}
if self.rtl {
x -= x_advance
}
glyphs.push(glyph.layout(font_size, x, y, span.rtl));
push_line = true;
if !self.rtl {
x += x_advance;
}
y += y_advance;
}
}
}
if push_line {
layout_lines.insert(
layout_i,
LayoutLine {
glyphs,
},
);
}
}
pub fn layout(
&self,
font_size: i32,
line_width: i32,
layout_lines: &mut Vec<LayoutLine>,
mut layout_i: usize,
wrap_simple: bool,
) {
let mut push_line = true;
let mut glyphs = Vec::new();
@ -556,7 +490,9 @@ impl ShapeLine {
for span in self.spans.iter() {
//TODO: improve performance!
let mut word_ranges = Vec::new();
if self.rtl != span.rtl {
if wrap_simple {
word_ranges.push((0..span.words.len(), false));
} else if self.rtl != span.rtl {
let mut fit_x = x;
let mut fitting_end = span.words.len();
for i in (0..span.words.len()).rev() {
@ -645,13 +581,12 @@ impl ShapeLine {
word_size += font_size as f32 * glyph.x_advance;
}
//TODO: make wrapping optional
let wrap = if self.rtl {
let word_wrap = if self.rtl {
x - word_size < end_x
} else {
x + word_size > end_x
};
if wrap && !glyphs.is_empty() {
if word_wrap && !wrap_simple && !glyphs.is_empty() {
let mut glyphs_swap = Vec::new();
std::mem::swap(&mut glyphs, &mut glyphs_swap);
layout_lines.insert(
@ -670,6 +605,27 @@ impl ShapeLine {
let x_advance = font_size as f32 * glyph.x_advance;
let y_advance = font_size as f32 * glyph.y_advance;
let glyph_wrap = if self.rtl {
x - x_advance < end_x
} else {
x + x_advance > end_x
};
if glyph_wrap {
let mut glyphs_swap = Vec::new();
std::mem::swap(&mut glyphs, &mut glyphs_swap);
layout_lines.insert(
layout_i,
LayoutLine {
glyphs: glyphs_swap,
},
);
layout_i += 1;
x = start_x;
y = 0.0;
}
if self.rtl {
x -= x_advance
}