On Fri, May 20, 2005 at 06:15:15AM +0200, Werner LEMBERG wrote:
>
> > > > As fontconfig and xft already have the code to "embolden" and
> > > > rely on FT_GlyphSlot_Embolden to do the real job, I think
> > > > FT_GlyphSlot_Embolden should be made standard API. This is an
> > > > important feature for Chinese (maybe also Japanese and Korean)
> > > > users, as most Chinese fonts don't have a real bold style.
> >
> > After some more inspection, I find there is already FT_Glyph for
> > glyph manipulation. Then, why not
> >
> > FT_Glyph_Embolden
> > FT_Glyph_Oblique
> > ?
>
> Are these new structures? Do you suggest them because you can't
> modify the public `FT_Glyph'?
They are new function calls.
We already have FT_Glyph_Translate to translate glyphs,
FT_Glyph_Transform to transform glyphs,
FT_Glyph_Stroke to stroke glyphs,
then why not
FT_Glyph_Embolden to embolden glyphs?
>
> > Also I tried to modify the embolden algorithm for outline glyph, and
> > it now uses similar algorithm as the one I use for bitmap glyph.
> > This is done because the old algorithm generates some artifact.
>
> Aah, another user has reported problems. Can you post the patch to
> the freetype-devel list, please?
Check the patch (algorithm only) in the attachment.
Index: src/base/ftsynth.c
===================================================================
RCS file: /home/cvs/freetype2/src/base/ftsynth.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 ftsynth.c
--- src/base/ftsynth.c 15 May 2005 07:10:28 -0000 1.1.1.1
+++ src/base/ftsynth.c 20 May 2005 05:24:57 -0000
@@ -115,7 +115,9 @@
{
FT_Pos d;
FT_Vector in, out;
+#ifdef OLD_ALGORITHM
FT_Fixed scale;
+#endif
FT_Angle angle_diff;
@@ -132,6 +134,7 @@
angle_in = FT_Atan2( in.x, in.y );
angle_out = FT_Atan2( out.x, out.y );
angle_diff = FT_Angle_Diff( angle_in, angle_out );
+#ifdef OLD_ALGORITHM
scale = FT_Cos( angle_diff/2 );
if ( scale < 0x400L && scale > -0x400L )
@@ -148,6 +151,23 @@
outline->points[n].x = v_cur.x + distance + in.x;
outline->points[n].y = v_cur.y + distance + in.y;
+#else
+ angle_diff = angle_in + angle_diff / 2 - rotate;
+ angle_diff = FT_Angle_Diff( 0, angle_diff );
+
+ d = distance * 2; /* strength */
+
+ if ( -FT_ANGLE_PI2 < angle_diff && angle_diff <= 0 ) {
+ outline->points[n].x = v_cur.x + d;
+ }
+ else if ( 0 < angle_diff && angle_diff < FT_ANGLE_PI2 ) {
+ outline->points[n].x = v_cur.x + d;
+ outline->points[n].y = v_cur.y + d;
+ }
+ else if ( FT_ANGLE_PI2 <= angle_diff && angle_diff < FT_ANGLE_PI ) {
+ outline->points[n].y = v_cur.y + d;
+ }
+#endif
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