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Font: Reduce synthetic bold strength at small sizes

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Use half-pixel outline emboldening for font sizes up to 22 pixels to
better match GDI's synthetic bold rendering of MS Gothic and MS Mincho.
Keep the existing full-pixel strength for larger sizes.
This commit is contained in:
kichikuou
2026-09-06 15:00:52 +09:00
parent 98e9d8bcfb
commit a0daa3261c
1 changed files with 11 additions and 7 deletions
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src/font.c
+11 -7
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@@ -187,16 +187,20 @@ int font_cell_overhang(FontSpec spec) {
return font.ascent - cell_ascent(&font);
}
static bool load_glyph(FT_Face face, int code, bool bold) {
static bool load_glyph(FontSpec spec, FT_Face face, int code) {
if (FT_Load_Char(face, code, FT_LOAD_DEFAULT))
return false;
if (bold) {
// Approximate GDI's synthetic bold at small sizes: grow only to the
// right by 1px, without changing the advance. Expand outlines before
// rasterization so antialiased edges are generated only once.
if (spec.weight == FONT_WEIGHT_BOLD) {
// Approximate GDI's synthetic bold without changing the advance.
// Expand outlines before rasterization so antialiased edges are
// generated only once.
FT_GlyphSlot slot = face->glyph;
if (slot->format == FT_GLYPH_FORMAT_OUTLINE) {
if (FT_Outline_EmboldenXY(&slot->outline, 64, 0))
// At small sizes, use half-pixel emboldening to better match
// GDI's synthetic bold for the thin bitmap glyphs of MS Gothic
// and MS Mincho.
int xstrength = spec.size <= 22 ? 32 : 64;
if (FT_Outline_EmboldenXY(&slot->outline, xstrength, 0))
return false;
} else if (slot->format == FT_GLYPH_FORMAT_BITMAP) {
if (FT_GlyphSlot_Own_Bitmap(slot) ||
@@ -239,7 +243,7 @@ static const Glyph *get_glyph(FontSpec spec, FT_Face face, int code, bool antial
if (cached)
return cached;
if (!load_glyph(face, code, spec.weight == FONT_WEIGHT_BOLD))
if (!load_glyph(spec, face, code))
return NULL;
FT_GlyphSlot slot = face->glyph;
static Glyph temporary;