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Implement glyph scaling in a way that works with emojis as well

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This commit is contained in:
Antonio Scandurra 2022-04-13 15:56:32 +02:00
parent 4249b5687e
commit fff1d9c631
1 changed files with 8 additions and 13 deletions
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21
crates/gpui/src/platform/mac/fonts.rs
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@ -199,28 +199,23 @@ impl FontSystemState {
// 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, 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,
c: -transform.matrix.m12() as CGFloat,
d: transform.matrix.m22() as CGFloat,
tx: transform.vector.x() as CGFloat,
ty: -transform.vector.y() as CGFloat,
});
cx.translate(
-glyph_bounds.origin_x() as CGFloat,
(glyph_bounds.origin_y() + glyph_bounds.height()) as CGFloat,
);
cx.scale(scale_factor as CGFloat, scale_factor 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 * scale_factor) as CGFloat)
.clone_with_font_size(font_size as CGFloat)
.draw_glyphs(
&[glyph_id as CGGlyph],
&[CGPoint::new(
subpixel_shift.x() as CGFloat,
subpixel_shift.y() as CGFloat,
(subpixel_shift.x() / scale_factor) as CGFloat,
(subpixel_shift.y() / scale_factor) as CGFloat,
)],
cx,
);