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Center before quantizing bitmap glyphs

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This commit is contained in:
Daniel Wennberg
2025-09-01 18:28:51 -07:00
committed by Mitchell Hashimoto
parent 071621a8c2
commit 96fbff681b
2 changed files with 20 additions and 20 deletions
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20
src/font/face/coretext.zig
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@@ -378,16 +378,6 @@ pub const Face = struct {
var width = glyph_size.width;
var height = glyph_size.height;
// If this is a bitmap glyph, it will always render as full pixels,
// not fractional pixels, so we need to quantize its position and
// size accordingly to align to full pixels so we get good results.
if (sbix) {
width = cell_width - @round(cell_width - width - x) - @round(x);
height = cell_height - @round(cell_height - height - y) - @round(y);
x = @round(x);
y = @round(y);
}
// We center all glyphs within the pixel-rounded and adjusted
// cell width if it's larger than the face width, so that they
// aren't weirdly off to the left.
@@ -400,6 +390,16 @@ pub const Face = struct {
x += (cell_width - metrics.face_width) / 2;
}
// If this is a bitmap glyph, it will always render as full pixels,
// not fractional pixels, so we need to quantize its position and
// size accordingly to align to full pixels so we get good results.
if (sbix) {
width = cell_width - @round(cell_width - width - x) - @round(x);
height = cell_height - @round(cell_height - height - y) - @round(y);
x = @round(x);
y = @round(y);
}
// Our whole-pixel bearings for the final glyph.
// The fractional portion will be included in the rasterized position.
const px_x: i32 = @intFromFloat(@floor(x));

20
src/font/face/freetype.zig
View File

@@ -492,16 +492,6 @@ pub const Face = struct {
var x = glyph_size.x;
var y = glyph_size.y;
// If this is a bitmap glyph, it will always render as full pixels,
// not fractional pixels, so we need to quantize its position and
// size accordingly to align to full pixels so we get good results.
if (glyph.*.format == freetype.c.FT_GLYPH_FORMAT_BITMAP) {
width = cell_width - @round(cell_width - width - x) - @round(x);
height = cell_height - @round(cell_height - height - y) - @round(y);
x = @round(x);
y = @round(y);
}
// We center all glyphs within the pixel-rounded and adjusted
// cell width if it's larger than the face width, so that they
// aren't weirdly off to the left.
@@ -520,6 +510,16 @@ pub const Face = struct {
x += @round((cell_width - metrics.face_width) / 2);
}
// If this is a bitmap glyph, it will always render as full pixels,
// not fractional pixels, so we need to quantize its position and
// size accordingly to align to full pixels so we get good results.
if (glyph.*.format == freetype.c.FT_GLYPH_FORMAT_BITMAP) {
width = cell_width - @round(cell_width - width - x) - @round(x);
height = cell_height - @round(cell_height - height - y) - @round(y);
x = @round(x);
y = @round(y);
}
// Now we can render the glyph.
var bitmap: freetype.c.FT_Bitmap = undefined;
_ = freetype.c.FT_Bitmap_Init(&bitmap);