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Checkpoint: emojis rendering

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This commit is contained in:
Antonio Scandurra 2023-10-04 12:41:21 +02:00
parent cd1c137542
commit 5c750b6880
12 changed files with 453 additions and 427 deletions
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52
crates/gpui3/src/platform/mac/text_system.rs
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@ -12,7 +12,11 @@ use core_foundation::{
base::{CFRange, TCFType},
string::CFString,
};
use core_graphics::{base::CGGlyph, color_space::CGColorSpace, context::CGContext};
use core_graphics::{
base::{kCGImageAlphaPremultipliedLast, CGGlyph},
color_space::CGColorSpace,
context::CGContext,
};
use core_text::{font::CTFont, line::CTLine, string_attributes::kCTFontAttributeName};
use font_kit::{
font::Font as FontKitFont,
@ -262,16 +266,31 @@ impl MacTextSystemState {
bitmap_size.height += DevicePixels(1);
}
let mut bytes = vec![0; bitmap_size.width.0 as usize * bitmap_size.height.0 as usize];
let cx = CGContext::create_bitmap_context(
Some(bytes.as_mut_ptr() as *mut _),
bitmap_size.width.0 as usize,
bitmap_size.height.0 as usize,
8,
bitmap_size.width.0 as usize,
&CGColorSpace::create_device_gray(),
kCGImageAlphaOnly,
);
let mut bytes;
let cx;
if params.is_emoji {
bytes = vec![0; bitmap_size.width.0 as usize * 4 * bitmap_size.height.0 as usize];
cx = CGContext::create_bitmap_context(
Some(bytes.as_mut_ptr() as *mut _),
bitmap_size.width.0 as usize,
bitmap_size.height.0 as usize,
8,
bitmap_size.width.0 as usize * 4,
&CGColorSpace::create_device_rgb(),
kCGImageAlphaPremultipliedLast,
);
} else {
bytes = vec![0; bitmap_size.width.0 as usize * bitmap_size.height.0 as usize];
cx = CGContext::create_bitmap_context(
Some(bytes.as_mut_ptr() as *mut _),
bitmap_size.width.0 as usize,
bitmap_size.height.0 as usize,
8,
bitmap_size.width.0 as usize,
&CGColorSpace::create_device_gray(),
kCGImageAlphaOnly,
);
}
// Move the origin to bottom left and account for scaling, this
// makes drawing text consistent with the font-kit's raster_bounds.
@ -303,6 +322,17 @@ impl MacTextSystemState {
cx,
);
if params.is_emoji {
// Convert from RGBA with premultiplied alpha to BGRA with straight alpha.
for pixel in bytes.chunks_exact_mut(4) {
pixel.swap(0, 2);
let a = pixel[3] as f32 / 255.;
pixel[0] = (pixel[0] as f32 / a) as u8;
pixel[1] = (pixel[1] as f32 / a) as u8;
pixel[2] = (pixel[2] as f32 / a) as u8;
}
}
Ok((bitmap_size.into(), bytes))
}
}