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Center-align all text vertically (#5117)

Browse Source 
* Closes https://github.com/emilk/egui/issues/4929
* Builds on top of https://github.com/emilk/egui/pull/2724 by @lictex
(ptal!)
* Implement `Center` and `Max` vertical text alignment properly
* Change default vertical alignment of text to centering

The end result is that text centers better in buttons and other places,
especially when mixing in emojis.
Before, mixing text of different heights (e.g. emojis and latin text) in
a label or button would cause the text to jump vertically.

## Before
This is `master`, with custom `FontTweak` to move fonts up and down:
<img width="1714" alt="image"
src="https://github.com/user-attachments/assets/a10e2927-e824-4580-baea-124c0b38a527">
<img width="102" alt="image"
src="https://github.com/user-attachments/assets/cd41f415-197b-42cd-9558-d46d63c21dcb">


## After
This PR, with the default (zero) `FontTweak`

<img width="102" alt="image"
src="https://github.com/user-attachments/assets/15e7d896-66b1-4996-ab58-dd1850b19a63">

<img width="1714" alt="image"
src="https://github.com/user-attachments/assets/54ec708c-7698-4754-b1fc-fea0fd240ec9">
This commit is contained in:
Emil Ernerfeldt
2024-09-19 11:44:29 +02:00
committed by GitHub
parent bb9e874c83
commit 2a40d16e5a
11 changed files with 148 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
crates/epaint/src/text/font.rs
View File

@@ -468,6 +468,14 @@ impl Font {
(Some(font_impl), glyph_info)
}
pub(crate) fn ascent(&self) -> f32 {
if let Some(first) = self.fonts.first() {
first.ascent()
} else {
self.row_height
}
}
fn glyph_info_no_cache_or_fallback(&mut self, c: char) -> Option<(FontIndex, GlyphInfo)> {
for (font_index, font_impl) in self.fonts.iter().enumerate() {
if let Some(glyph_info) = font_impl.glyph_info(c) {

19
crates/epaint/src/text/fonts.rs
View File

@@ -189,7 +189,7 @@ impl Default for FontTweak {
scale: 1.0,
y_offset_factor: 0.0,
y_offset: 0.0,
baseline_offset_factor: -0.0333, // makes the default fonts look more centered in buttons and such
baseline_offset_factor: 0.0,
}
}
}
@@ -271,29 +271,26 @@ impl Default for FontDefinitions {
let mut families = BTreeMap::new();
font_data.insert("Hack".to_owned(), FontData::from_static(HACK_REGULAR));
font_data.insert(
"Ubuntu-Light".to_owned(),
FontData::from_static(UBUNTU_LIGHT),
);
// Some good looking emojis. Use as first priority:
font_data.insert(
"NotoEmoji-Regular".to_owned(),
FontData::from_static(NOTO_EMOJI_REGULAR).tweak(FontTweak {
scale: 0.81, // make it smaller
scale: 0.81, // Make smaller
..Default::default()
}),
);
font_data.insert(
"Ubuntu-Light".to_owned(),
FontData::from_static(UBUNTU_LIGHT),
);
// Bigger emojis, and more. <http://jslegers.github.io/emoji-icon-font/>:
font_data.insert(
"emoji-icon-font".to_owned(),
FontData::from_static(EMOJI_ICON).tweak(FontTweak {
scale: 0.88, // make it smaller
// probably not correct, but this does make texts look better (#2724 for details)
y_offset_factor: 0.11, // move glyphs down to better align with common fonts
baseline_offset_factor: -0.11, // ...now the entire row is a bit down so shift it back
scale: 0.90, // Make smaller
..Default::default()
}),
);

75
crates/epaint/src/text/text_layout.rs
View File

@@ -171,8 +171,12 @@ fn layout_section(
paragraph.glyphs.push(Glyph {
chr,
pos: pos2(paragraph.cursor_x, f32::NAN),
size: vec2(glyph_info.advance_width, line_height),
ascent: font_impl.map_or(0.0, |font| font.ascent()), // Failure to find the font here would be weird
advance_width: glyph_info.advance_width,
line_height,
font_impl_height: font_impl.map_or(0.0, |f| f.row_height()),
font_impl_ascent: font_impl.map_or(0.0, |f| f.ascent()),
font_height: font.row_height(),
font_ascent: font.ascent(),
uv_rect: glyph_info.uv_rect,
section_index,
});
@@ -376,7 +380,7 @@ fn replace_last_glyph_with_overflow_character(
let (_, last_glyph_info) = font.font_impl_and_glyph_info(last_glyph.chr);
let mut x = last_glyph.pos.x + last_glyph.size.x;
let mut x = last_glyph.pos.x + last_glyph.advance_width;
let (font_impl, replacement_glyph_info) = font.font_impl_and_glyph_info(overflow_character);
@@ -391,8 +395,12 @@ fn replace_last_glyph_with_overflow_character(
row.glyphs.push(Glyph {
chr: overflow_character,
pos: pos2(x, f32::NAN),
size: vec2(replacement_glyph_info.advance_width, line_height),
ascent: font_impl.map_or(0.0, |font| font.ascent()), // Failure to find the font here would be weird
advance_width: replacement_glyph_info.advance_width,
line_height,
font_impl_height: font_impl.map_or(0.0, |f| f.row_height()),
font_impl_ascent: font_impl.map_or(0.0, |f| f.ascent()),
font_height: font.row_height(),
font_ascent: font.ascent(),
uv_rect: replacement_glyph_info.uv_rect,
section_index,
});
@@ -409,8 +417,12 @@ fn replace_last_glyph_with_overflow_character(
row.glyphs.push(Glyph {
chr: overflow_character,
pos: pos2(x, f32::NAN),
size: vec2(replacement_glyph_info.advance_width, line_height),
ascent: font_impl.map_or(0.0, |font| font.ascent()), // Failure to find the font here would be weird
advance_width: replacement_glyph_info.advance_width,
line_height,
font_impl_height: font_impl.map_or(0.0, |f| f.row_height()),
font_impl_ascent: font_impl.map_or(0.0, |f| f.ascent()),
font_height: font.row_height(),
font_ascent: font.ascent(),
uv_rect: replacement_glyph_info.uv_rect,
section_index,
});
@@ -438,7 +450,6 @@ fn replace_last_glyph_with_overflow_character(
let section = &job.sections[last_glyph.section_index as usize];
let extra_letter_spacing = section.format.extra_letter_spacing;
let font = fonts.font(&section.format.font_id);
let line_height = row_height(section, font);
if let Some(prev_glyph) = prev_glyph {
let prev_glyph_id = font.font_impl_and_glyph_info(prev_glyph.chr).1.id;
@@ -453,7 +464,9 @@ fn replace_last_glyph_with_overflow_character(
// Replace the glyph:
last_glyph.chr = overflow_character;
let (font_impl, glyph_info) = font.font_impl_and_glyph_info(last_glyph.chr);
last_glyph.size = vec2(glyph_info.advance_width, line_height);
last_glyph.advance_width = glyph_info.advance_width;
last_glyph.font_impl_ascent = font_impl.map_or(0.0, |f| f.ascent());
last_glyph.font_impl_height = font_impl.map_or(0.0, |f| f.row_height());
last_glyph.uv_rect = glyph_info.uv_rect;
// Reapply kerning:
@@ -472,8 +485,10 @@ fn replace_last_glyph_with_overflow_character(
} else {
// Just replace and be done with it.
last_glyph.chr = overflow_character;
let (_, glyph_info) = font.font_impl_and_glyph_info(last_glyph.chr);
last_glyph.size = vec2(glyph_info.advance_width, line_height);
let (font_impl, glyph_info) = font.font_impl_and_glyph_info(last_glyph.chr);
last_glyph.advance_width = glyph_info.advance_width;
last_glyph.font_impl_ascent = font_impl.map_or(0.0, |f| f.ascent());
last_glyph.font_impl_height = font_impl.map_or(0.0, |f| f.row_height());
last_glyph.uv_rect = glyph_info.uv_rect;
return;
}
@@ -585,40 +600,36 @@ fn galley_from_rows(
let mut min_x: f32 = 0.0;
let mut max_x: f32 = 0.0;
for row in &mut rows {
let mut line_height = first_row_min_height.max(row.rect.height());
let mut row_ascent = 0.0f32;
let mut max_row_height = first_row_min_height.max(row.rect.height());
first_row_min_height = 0.0;
// take metrics from the highest font in this row
if let Some(glyph) = row
.glyphs
.iter()
.max_by(|a, b| a.size.y.partial_cmp(&b.size.y).unwrap())
{
line_height = glyph.size.y;
row_ascent = glyph.ascent;
for glyph in &row.glyphs {
max_row_height = max_row_height.max(glyph.line_height);
}
line_height = point_scale.round_to_pixel(line_height);
max_row_height = point_scale.round_to_pixel(max_row_height);
// Now positions each glyph:
// Now position each glyph vertically:
for glyph in &mut row.glyphs {
let format = &job.sections[glyph.section_index as usize].format;
let align_offset = match format.valign {
Align::Center | Align::Max => row_ascent,
glyph.pos.y = cursor_y
+ glyph.font_impl_ascent
// raised text.
Align::Min => glyph.ascent,
};
glyph.pos.y = cursor_y + align_offset;
// Apply valign to the different in height of the entire row, and the height of this `Font`:
+ format.valign.to_factor() * (max_row_height - glyph.line_height)
// When mixing different `FontImpl` (e.g. latin and emojis),
// we always center the difference:
+ 0.5 * (glyph.font_height - glyph.font_impl_height);
glyph.pos.y = point_scale.round_to_pixel(glyph.pos.y);
}
row.rect.min.y = cursor_y;
row.rect.max.y = cursor_y + line_height;
row.rect.max.y = cursor_y + max_row_height;
min_x = min_x.min(row.rect.min.x);
max_x = max_x.max(row.rect.max.x);
cursor_y += line_height;
cursor_y += max_row_height;
cursor_y = point_scale.round_to_pixel(cursor_y);
}

41
crates/epaint/src/text/text_layout_types.rs
View File

@@ -279,8 +279,14 @@ pub struct TextFormat {
/// If you use a small font and [`Align::TOP`] you
/// can get the effect of raised text.
///
/// If you use a small font and [`Align::BOTTOM`]
/// you get the effect of a subscript.
///
/// If you use [`Align::Center`], you get text that is centered
/// around a common center-line, which is nice when mixining emojis
/// and normal text in e.g. a button.
pub valign: Align,
// TODO(emilk): lowered
}
impl Default for TextFormat {
@@ -602,13 +608,26 @@ pub struct Glyph {
/// Logical position: pos.y is the same for all chars of the same [`TextFormat`].
pub pos: Pos2,
/// `ascent` value from the font
pub ascent: f32,
/// Logical width of the glyph.
pub advance_width: f32,
/// Advance width and line height.
/// Height of this row of text.
///
/// Does not control the visual size of the glyph (see [`Self::uv_rect`] for that).
pub size: Vec2,
/// Usually same as [`Self::font_height`],
/// unless explicitly overridden by [`TextFormat::line_height`].
pub line_height: f32,
/// The ascent of this font.
pub font_ascent: f32,
/// The row/line height of this font.
pub font_height: f32,
/// The ascent of the sub-font within the font ("FontImpl").
pub font_impl_ascent: f32,
/// The row/line height of the sub-font within the font ("FontImpl").
pub font_impl_height: f32,
/// Position and size of the glyph in the font texture, in texels.
pub uv_rect: UvRect,
@@ -618,14 +637,20 @@ pub struct Glyph {
}
impl Glyph {
#[inline]
pub fn size(&self) -> Vec2 {
Vec2::new(self.advance_width, self.line_height)
}
#[inline]
pub fn max_x(&self) -> f32 {
self.pos.x + self.size.x
self.pos.x + self.advance_width
}
/// Same y range for all characters with the same [`TextFormat`].
#[inline]
pub fn logical_rect(&self) -> Rect {
Rect::from_min_size(self.pos - vec2(0.0, self.ascent), self.size)
Rect::from_min_size(self.pos - vec2(0.0, self.font_ascent), self.size())
}
}