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Make room for font subpixel variants correctly

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This commit is contained in:
Antonio Scandurra 2022-04-13 11:36:54 +02:00
parent 6b629dfa5c
commit 6cc9306f00
1 changed files with 16 additions and 14 deletions
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30
crates/gpui/src/platform/mac/fonts.rs
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@ -159,7 +159,7 @@ impl FontSystemState {
) -> Option<(RectI, Vec<u8>)> {
let font = &self.fonts[font_id.0];
let scale = Transform2F::from_scale(scale_factor);
let bounds = font
let glyph_bounds = font
.raster_bounds(
glyph_id,
font_size,
@ -169,26 +169,26 @@ impl FontSystemState {
)
.ok()?;
if bounds.width() == 0 || bounds.height() == 0 {
if glyph_bounds.width() == 0 || glyph_bounds.height() == 0 {
None
} else {
// Make room for subpixel variants.
let bounds = RectI::new(bounds.origin(), bounds.size() + vec2i(1, 1));
let mut pixels = vec![0; bounds.width() as usize * bounds.height() as usize];
let cx_bounds = RectI::new(glyph_bounds.origin(), glyph_bounds.size() + vec2i(1, 1));
let mut bytes = vec![0; cx_bounds.width() as usize * cx_bounds.height() as usize];
let cx = CGContext::create_bitmap_context(
Some(pixels.as_mut_ptr() as *mut _),
bounds.width() as usize,
bounds.height() as usize,
Some(bytes.as_mut_ptr() as *mut _),
cx_bounds.width() as usize,
cx_bounds.height() as usize,
8,
bounds.width() as usize,
cx_bounds.width() 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.
cx.translate(0.0, bounds.height() as CGFloat);
let transform = scale.translate(-bounds.origin().to_f32());
cx.translate(0.0, glyph_bounds.height() as CGFloat);
let transform = Transform2F::from_translation(-glyph_bounds.origin().to_f32());
cx.set_text_matrix(&CGAffineTransform {
a: transform.matrix.m11() as CGFloat,
b: -transform.matrix.m21() as CGFloat,
@ -198,20 +198,22 @@ impl FontSystemState {
ty: -transform.vector.y() as CGFloat,
});
cx.set_allows_font_subpixel_positioning(true);
cx.set_should_subpixel_position_fonts(true);
cx.set_allows_font_subpixel_quantization(false);
cx.set_should_subpixel_quantize_fonts(false);
font.native_font()
.clone_with_font_size(font_size as CGFloat)
.clone_with_font_size((font_size * scale_factor) as CGFloat)
.draw_glyphs(
&[glyph_id as CGGlyph],
&[CGPoint::new(
(subpixel_shift.x() / scale_factor) as CGFloat,
(subpixel_shift.y() / scale_factor) as CGFloat,
subpixel_shift.x() as CGFloat,
subpixel_shift.y() as CGFloat,
)],
cx,
);
Some((bounds, pixels))
Some((cx_bounds, bytes))
}
}