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Refactor to text::draw_pixel helper

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This commit is contained in:
tarkah 2022-11-01 11:54:53 -07:00 • committed by Jeremy Soller
parent 9e389b629b
commit 06cb0c2637
2 changed files with 54 additions and 82 deletions
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93
examples/editor-libcosmic/src/text.rs
View file

@ -195,48 +195,9 @@ where
};
cache.with_pixels(cache_key, glyph_color, |pixel_x, pixel_y, color| {
let alpha = (color.0 >> 24) & 0xFF;
if alpha == 0 {
// Do not draw if alpha is zero
return;
}
let y = line_y + y_int + pixel_y;
if y < 0 || y >= layout_h {
// Skip if y out of bounds
return;
}
let x = x_int + pixel_x;
if x < 0 || x >= layout_w {
// Skip if x out of bounds
return;
}
let offset = (y as usize * layout_w as usize + x as usize) * 4;
let mut current =
pixels[offset] as u32 |
(pixels[offset + 1] as u32) << 8 |
(pixels[offset + 2] as u32) << 16 |
(pixels[offset + 3] as u32) << 24;
if alpha >= 255 || current == 0 {
// Alpha is 100% or current is null, replace with no blending
current = color.0;
} else {
// Alpha blend with current value
let n_alpha = 255 - alpha;
let rb = ((n_alpha * (current & 0x00FF00FF)) + (alpha * (color.0 & 0x00FF00FF))) >> 8;
let ag = (n_alpha * ((current & 0xFF00FF00) >> 8))
+ (alpha * (0x01000000 | ((color.0 & 0x0000FF00) >> 8)));
current = (rb & 0x00FF00FF) | (ag & 0xFF00FF00);
}
pixels[offset] = current as u8;
pixels[offset + 1] = (current >> 8) as u8;
pixels[offset + 2] = (current >> 16) as u8;
pixels[offset + 3] = (current >> 24) as u8;
let y = line_y + y_int + pixel_y;
draw_pixel(&mut pixels, layout_w, layout_h, x, y, color);
});
}
line_y += self.metrics.line_height;
@ -249,6 +210,56 @@ where
}
}
pub fn draw_pixel(
buffer: &mut [u8],
width: i32,
height: i32,
x: i32,
y: i32,
color: cosmic_text::Color
) {
let alpha = (color.0 >> 24) & 0xFF;
if alpha == 0 {
// Do not draw if alpha is zero
return;
}
if y < 0 || y >= height {
// Skip if y out of bounds
return;
}
if x < 0 || x >= width {
// Skip if x out of bounds
return;
}
let offset = (y as usize * width as usize + x as usize) * 4;
let mut current =
buffer[offset] as u32 |
(buffer[offset + 1] as u32) << 8 |
(buffer[offset + 2] as u32) << 16 |
(buffer[offset + 3] as u32) << 24;
if alpha >= 255 || current == 0 {
// Alpha is 100% or current is null, replace with no blending
current = color.0;
} else {
// Alpha blend with current value
let n_alpha = 255 - alpha;
let rb = ((n_alpha * (current & 0x00FF00FF)) + (alpha * (color.0 & 0x00FF00FF))) >> 8;
let ag = (n_alpha * ((current & 0xFF00FF00) >> 8))
+ (alpha * (0x01000000 | ((color.0 & 0x0000FF00) >> 8)));
current = (rb & 0x00FF00FF) | (ag & 0xFF00FF00);
}
buffer[offset] = current as u8;
buffer[offset + 1] = (current >> 8) as u8;
buffer[offset + 2] = (current >> 16) as u8;
buffer[offset + 3] = (current >> 24) as u8;
}
impl<'a, Message, Renderer> From<Text> for Element<'a, Message, Renderer>
where
Renderer: renderer::Renderer + image::Renderer<Handle = image::Handle>,

43
examples/editor-libcosmic/src/text_box.rs
View file

@ -21,6 +21,7 @@ use std::{
sync::Mutex,
time::Instant,
};
use super::text;
pub struct Appearance {
background_color: Option<Color>,
@ -194,49 +195,9 @@ where
(color.a() as f32) / 255.0
)
);
return;
}
if y < 0 || y >= view_h {
// Do not draw if y out of bounds
return;
}
if x < 0 || x >= view_w {
// Do not draw if x out of bounds
return;
}
let alpha = (color.0 >> 24) & 0xFF;
if alpha == 0 {
// Do not draw if alpha is zero
return;
}
let offset = (y as usize * view_w as usize + x as usize) * 4;
let mut current =
pixels[offset] as u32 |
(pixels[offset + 1] as u32) << 8 |
(pixels[offset + 2] as u32) << 16 |
(pixels[offset + 3] as u32) << 24;
if alpha >= 255 || current == 0 {
// Alpha is 100% or current is null, replace with no blending
current = color.0;
} else {
// Alpha blend with current value
let n_alpha = 255 - alpha;
let rb = ((n_alpha * (current & 0x00FF00FF)) + (alpha * (color.0 & 0x00FF00FF))) >> 8;
let ag = (n_alpha * ((current & 0xFF00FF00) >> 8))
+ (alpha * (0x01000000 | ((color.0 & 0x0000FF00) >> 8)));
current = (rb & 0x00FF00FF) | (ag & 0xFF00FF00);
text::draw_pixel(&mut pixels, view_w, view_h, x, y, color);
}
pixels[offset] = current as u8;
pixels[offset + 1] = (current >> 8) as u8;
pixels[offset + 2] = (current >> 16) as u8;
pixels[offset + 3] = (current >> 24) as u8;
});
let handle = image::Handle::from_pixels(view_w as u32, view_h as u32, pixels);