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improve 1/8th block drawing

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* Rename `draw_quad` to `fill_rect` to better indicate what it is doing.
* Switch the 1/8th block rendering to use `fill_rect` with math that is
  consistent with quad drawing to compute the bounds.

refs: https://github.com/dankamongmen/notcurses/issues/1715#issuecomment-860072690
This commit is contained in:
Wez Furlong 2021-06-12 10:04:08 -07:00
parent 2e7dc70eaf
commit ad0ee8f832
2 changed files with 31 additions and 62 deletions
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6
test-data/blocks.py
View File

@ -11,11 +11,13 @@ print(s)
print(s)
print()
# Upper and lower block
print("\u2580\u2584")
print()
s = ""
for b in range(0x1fb00, 0x1fb3c):
s += chr(b) + " "
print(s)
print(s)
print(s)
print()

87
wezterm-gui/src/glyphcache.rs
View File

@ -815,38 +815,15 @@ impl<T: Texture2d> GlyphCache<T> {
let cell_rect = Rect::new(Point::new(0, 0), self.metrics.cell_size);
let y_eighth = self.metrics.cell_size.height as f32 / 8.;
let x_eighth = self.metrics.cell_size.width as f32 / 8.;
fn scale(f: f32) -> usize {
f.ceil().max(1.) as usize
}
buffer.clear_rect(cell_rect, black);
let draw_horizontal = |buffer: &mut Image, y: usize| {
buffer.draw_line(
Point::new(cell_rect.origin.x, cell_rect.origin.y + y as isize),
Point::new(
cell_rect.origin.x + self.metrics.cell_size.width,
cell_rect.origin.y + y as isize,
),
white,
);
};
let draw_vertical = |buffer: &mut Image, x: usize| {
buffer.draw_line(
Point::new(cell_rect.origin.x + x as isize, cell_rect.origin.y),
Point::new(
cell_rect.origin.x + x as isize,
cell_rect.origin.y + self.metrics.cell_size.height,
),
white,
);
};
let draw_quad = |buffer: &mut Image, x: Range<usize>, y: Range<usize>| {
/// Fill a rectangular region described by the x and y ranges
/// TODO: this could probably be a call to buffer.clear_rect?
let fill_rect = |buffer: &mut Image, x: Range<usize>, y: Range<usize>| {
for y in y {
buffer.draw_line(
Point::new(
@ -868,36 +845,26 @@ impl<T: Texture2d> GlyphCache<T> {
match block {
BlockKey::Upper(num) => {
for n in 0..usize::from(num) {
for a in 0..scale(y_eighth) {
draw_horizontal(&mut buffer, (n as f32 * y_eighth).floor() as usize + a);
}
}
let lower = self.metrics.cell_size.height as f32 * (num as f32) / 8.;
let width = self.metrics.cell_size.width as usize;
fill_rect(&mut buffer, 0..width, 0..scale(lower));
}
BlockKey::Lower(num) => {
for n in 0..usize::from(num) {
let y =
(self.metrics.cell_size.height - 1) as usize - scale(n as f32 * y_eighth);
for a in 0..scale(y_eighth) {
draw_horizontal(&mut buffer, y + a);
}
}
let upper = self.metrics.cell_size.height as f32 * ((8 - num) as f32) / 8.;
let width = self.metrics.cell_size.width as usize;
let height = self.metrics.cell_size.height as usize;
fill_rect(&mut buffer, 0..width, scale(upper)..height);
}
BlockKey::Left(num) => {
for n in 0..usize::from(num) {
for a in 0..scale(x_eighth) {
draw_vertical(&mut buffer, (n as f32 * x_eighth).floor() as usize + a);
}
}
let width = self.metrics.cell_size.width as f32 * (num as f32) / 8.;
let height = self.metrics.cell_size.height as usize;
fill_rect(&mut buffer, 0..scale(width), 0..height);
}
BlockKey::Right(num) => {
for n in 0..usize::from(num) {
let x =
(self.metrics.cell_size.width - 1) as usize - scale(n as f32 * x_eighth);
for a in 0..scale(x_eighth) {
draw_vertical(&mut buffer, x + a);
}
}
let left = self.metrics.cell_size.width as f32 * ((8 - num) as f32) / 8.;
let width = self.metrics.cell_size.width as usize;
let height = self.metrics.cell_size.height as usize;
fill_rect(&mut buffer, scale(left)..width, 0..height);
}
BlockKey::Full(alpha) => {
let alpha = match alpha {
@ -916,16 +883,16 @@ impl<T: Texture2d> GlyphCache<T> {
let width = self.metrics.cell_size.width as usize;
let height = self.metrics.cell_size.height as usize;
if quads.contains(Quadrant::UPPER_LEFT) {
draw_quad(&mut buffer, 0..scale(x_half), 0..scale(y_half));
fill_rect(&mut buffer, 0..scale(x_half), 0..scale(y_half));
}
if quads.contains(Quadrant::UPPER_RIGHT) {
draw_quad(&mut buffer, scale(x_half)..width, 0..scale(y_half));
fill_rect(&mut buffer, scale(x_half)..width, 0..scale(y_half));
}
if quads.contains(Quadrant::LOWER_LEFT) {
draw_quad(&mut buffer, 0..scale(x_half), scale(y_half)..height);
fill_rect(&mut buffer, 0..scale(x_half), scale(y_half)..height);
}
if quads.contains(Quadrant::LOWER_RIGHT) {
draw_quad(&mut buffer, scale(x_half)..width, scale(y_half)..height);
fill_rect(&mut buffer, scale(x_half)..width, scale(y_half)..height);
}
}
BlockKey::Sextants(s) => {
@ -935,30 +902,30 @@ impl<T: Texture2d> GlyphCache<T> {
let height = self.metrics.cell_size.height as usize;
if s.contains(Sextant::ONE) {
draw_quad(&mut buffer, 0..scale(x_half), 0..scale(y_third));
fill_rect(&mut buffer, 0..scale(x_half), 0..scale(y_third));
}
if s.contains(Sextant::TWO) {
draw_quad(&mut buffer, scale(x_half)..width, 0..scale(y_third));
fill_rect(&mut buffer, scale(x_half)..width, 0..scale(y_third));
}
if s.contains(Sextant::THREE) {
draw_quad(
fill_rect(
&mut buffer,
0..scale(x_half),
scale(y_third)..scale(y_third * 2.),
);
}
if s.contains(Sextant::FOUR) {
draw_quad(
fill_rect(
&mut buffer,
scale(x_half)..width,
scale(y_third)..scale(y_third * 2.),
);
}
if s.contains(Sextant::FIVE) {
draw_quad(&mut buffer, 0..scale(x_half), scale(y_third * 2.)..height);
fill_rect(&mut buffer, 0..scale(x_half), scale(y_third * 2.)..height);
}
if s.contains(Sextant::SIX) {
draw_quad(
fill_rect(
&mut buffer,
scale(x_half)..width,
scale(y_third * 2.)..height,