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Separate hit detection and drawing for mouse event performance

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This commit is contained in:
Jeremy Soller 2022-10-05 10:16:55 -06:00
parent 44f4c153af
commit f7eb123140
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 88 additions and 61 deletions
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149
examples/text/src/main.rs
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@ -88,6 +88,7 @@ fn main() {
let mut mouse_y = -1;
let mut mouse_left = false;
let mut redraw = true;
let mut rehit = false;
let mut relayout = true;
let mut reshape = true;
let mut scroll = 0;
@ -124,6 +125,51 @@ fn main() {
println!("relayout: {:?}", duration);
}
if rehit {
let instant = Instant::now();
let window_lines = (window.height() as i32 + line_height - 1) / line_height;
scroll = cmp::max(0, cmp::min(
layout_lines.len() as i32 - (window_lines - 1),
scroll
));
let line_x = 8 * display_scale;
let mut line_y = line_height;
for (line_i, line) in layout_lines.iter().skip(scroll as usize).enumerate() {
if line_y >= window.height() as i32 {
break;
}
if mouse_left
&& mouse_y >= line_y - font_size
&& mouse_y < line_y - font_size + line_height
{
let new_cursor_line = line_i + scroll as usize;
let mut new_cursor_glyph = line.glyphs.len();
for (glyph_i, glyph) in line.glyphs.iter().enumerate() {
if mouse_x >= line_x + glyph.x as i32
&& mouse_x <= line_x + (glyph.x + glyph.w) as i32
{
new_cursor_glyph = glyph_i;
}
}
if new_cursor_line != cursor_line || new_cursor_glyph != cursor_glyph {
cursor_line = new_cursor_line;
cursor_glyph = new_cursor_glyph;
redraw = true;
}
}
line_y += line_height;
}
rehit = false;
let duration = instant.elapsed();
println!("rehit: {:?}", duration);
}
if redraw {
let instant = Instant::now();
@ -135,66 +181,47 @@ fn main() {
scroll
));
for &hitbox in &[true, false] {
let line_x = 8 * display_scale;
let mut line_y = line_height;
for (line_i, line) in layout_lines.iter().skip(scroll as usize).enumerate() {
if line_y >= window.height() as i32 {
break;
}
if hitbox {
if mouse_left
&& mouse_y >= line_y - font_size
&& mouse_y < line_y - font_size + line_height
{
cursor_line = line_i + scroll as usize;
cursor_glyph = line.glyphs.len();
for (glyph_i, glyph) in line.glyphs.iter().enumerate() {
if mouse_x >= line_x + glyph.x as i32
&& mouse_x <= line_x + (glyph.x + glyph.w) as i32
{
cursor_glyph = glyph_i;
}
}
}
} else {
if cursor_line == line_i + scroll as usize {
if cursor_glyph >= line.glyphs.len() {
let x = match line.glyphs.last() {
Some(glyph) => glyph.x + glyph.w,
None => 0.0
};
window.rect(
line_x + x as i32,
line_y - font_size,
(font_size / 2) as u32,
line_height as u32,
Color::rgba(0xFF, 0xFF, 0xFF, 0x20)
);
} else {
let glyph = &line.glyphs[cursor_glyph];
window.rect(
line_x + glyph.x as i32,
line_y - font_size,
glyph.w as u32,
line_height as u32,
Color::rgba(0xFF, 0xFF, 0xFF, 0x20)
);
println!("{}, {}: '{}'", glyph.start, glyph.end, &text[glyph.start..glyph.end]);
}
}
line.draw(|x, y, v| {
let c = (v * 255.0) as u32;
window.pixel(line_x + x, line_y + y, Color{
data: c << 24 | (font_color.data & 0x00FF_FFFF)
});
});
}
line_y += line_height;
let line_x = 8 * display_scale;
let mut line_y = line_height;
for (line_i, line) in layout_lines.iter().skip(scroll as usize).enumerate() {
if line_y >= window.height() as i32 {
break;
}
if cursor_line == line_i + scroll as usize {
if cursor_glyph >= line.glyphs.len() {
let x = match line.glyphs.last() {
Some(glyph) => glyph.x + glyph.w,
None => 0.0
};
window.rect(
line_x + x as i32,
line_y - font_size,
(font_size / 2) as u32,
line_height as u32,
Color::rgba(0xFF, 0xFF, 0xFF, 0x20)
);
} else {
let glyph = &line.glyphs[cursor_glyph];
window.rect(
line_x + glyph.x as i32,
line_y - font_size,
glyph.w as u32,
line_height as u32,
Color::rgba(0xFF, 0xFF, 0xFF, 0x20)
);
println!("{}, {}: '{}'", glyph.start, glyph.end, &text[glyph.start..glyph.end]);
}
}
line.draw(|x, y, v| {
let c = (v * 255.0) as u32;
window.pixel(line_x + x, line_y + y, Color{
data: c << 24 | (font_color.data & 0x00FF_FFFF)
});
});
line_y += line_height;
}
window.sync();
@ -295,14 +322,14 @@ fn main() {
mouse_x = event.x;
mouse_y = event.y;
if mouse_left {
redraw = true;
rehit = true;
}
},
EventOption::Button(event) => {
if event.left != mouse_left {
mouse_left = event.left;
if mouse_left {
redraw = true;
rehit = true;
}
}
}