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freetype2
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Code Issues 4 Releases Wiki Activity

* src/base/ftsynth.c (FT_GlyphSlot_AdjustWeight): New API. 

* include/freetype/ftsynth.h (FT_GlyphSlot_AdjustWeight): Document it.
This commit is contained in:
Alexei Podtelezhnikov 2023-03-09 16:47:08 -05:00
parent bd6208b712
commit faf5d5adce
2 changed files with 26 additions and 6 deletions
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12
include/freetype/ftsynth.h
View File

@ -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 );

20
src/base/ftsynth.c
View File

@ -97,9 +97,18 @@
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 );