Commit dd78d4a77458fa572c633b81e1f84b567f981ecc
2023-03-16T03:28:59
* src/base/ftsynth.c (FT_GlyphSlot_AdjustWeight): New API.
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diff --git a/include/freetype/ftsynth.h b/include/freetype/ftsynth.h
index 5d19697..af90967 100644
--- a/include/freetype/ftsynth.h
+++ b/include/freetype/ftsynth.h
@@ -68,6 +68,18 @@ FT_BEGIN_HEADER
FT_EXPORT( void )
FT_GlyphSlot_Embolden( FT_GlyphSlot slot );
+ /* Precisely adjust the glyph weight either horizontally or vertically. */
+ /* The `xdelta` and `ydelta` values are fractions of the face Em size */
+ /* (in fixed-point format). Considering that a regular face would have */
+ /* stem widths on the order of 0.1 Em, a delta of 0.05 (0x0CCC) should */
+ /* be very noticeable. To increase or decrease the weight, use positive */
+ /* or negative values, respectively. */
+ FT_EXPORT( void )
+ FT_GlyphSlot_AdjustWeight( FT_GlyphSlot slot,
+ FT_Fixed xdelta,
+ FT_Fixed ydelta );
+
+
/* Slant an outline glyph to the right by about 12 degrees. */
FT_EXPORT( void )
FT_GlyphSlot_Oblique( FT_GlyphSlot slot );
diff --git a/src/base/ftsynth.c b/src/base/ftsynth.c
index 6ec25e1..f32edd3 100644
--- a/src/base/ftsynth.c
+++ b/src/base/ftsynth.c
@@ -98,8 +98,17 @@
FT_EXPORT_DEF( void )
FT_GlyphSlot_Embolden( FT_GlyphSlot slot )
{
+ FT_GlyphSlot_AdjustWeight( slot, 0x0AAA, 0x0AAA );
+ }
+
+
+ FT_EXPORT_DEF( void )
+ FT_GlyphSlot_AdjustWeight( FT_GlyphSlot slot,
+ FT_Fixed xdelta,
+ FT_Fixed ydelta )
+ {
FT_Library library;
- FT_Face face;
+ FT_Size size;
FT_Error error;
FT_Pos xstr, ystr;
@@ -108,16 +117,15 @@
return;
library = slot->library;
- face = slot->face;
+ size = slot->face->size;
if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
slot->format != FT_GLYPH_FORMAT_BITMAP )
return;
- /* some reasonable strength */
- xstr = FT_MulFix( face->units_per_EM,
- face->size->metrics.y_scale ) / 24;
- ystr = xstr;
+ /* express deltas in pixels in 26.6 format */
+ xstr = (FT_Pos)size->metrics.x_ppem * xdelta / 1024;
+ ystr = (FT_Pos)size->metrics.y_ppem * ydelta / 1024;
if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
FT_Outline_EmboldenXY( &slot->outline, xstr, ystr );