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Option to use the lighter hinting algorithm (FT_LOAD_TARGET_LIGHT).

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I've found this algorithm produces clearer results when rendering
some fonts at small point sizes.

Change-Id: If87d82731ad324405195b25baad78fe54e92c142
Reviewed-on: http://gerrit.rockbox.org/412
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
Tested: Purling Nayuki <cyq.yzfl@gmail.com>
Reviewed-by: Thomas Martitz <kugel@rockbox.org>
This commit is contained in:
Nick Peskett 2013-03-03 02:39:27 +00:00 • committed by Thomas Martitz
parent 77ee2851de
commit e1da541749
1 changed files with 8 additions and 5 deletions
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13
tools/convttf.c
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@ -111,6 +111,7 @@ int trim_dp = 0; /* trim descent percent */
int trim_da = 0; /* trim descnet actual */ int trim_da = 0; /* trim descnet actual */
int trim_ap = 0; /* trim ascent precent */ int trim_ap = 0; /* trim ascent precent */
int trim_aa = 0; /* trim ascent actual */ int trim_aa = 0; /* trim ascent actual */
int ft_load_opts = FT_LOAD_RENDER | FT_LOAD_NO_BITMAP;
struct font_header_struct { struct font_header_struct {
char header[4]; /* magic number and version bytes */ char header[4]; /* magic number and version bytes */
@ -207,6 +208,7 @@ void usage(void)
" -t N Index of true type collection. It must be start from 0.(default N=0).\n" " -t N Index of true type collection. It must be start from 0.(default N=0).\n"
" -ta Convert all fonts in ttc (ignores outfile option)\n" " -ta Convert all fonts in ttc (ignores outfile option)\n"
" -w Don't try to make digits (0-9) equally wide\n" " -w Don't try to make digits (0-9) equally wide\n"
" -L Use lighter hinting algorithm\n"
}; };
fprintf(stderr, "%s", help); fprintf(stderr, "%s", help);
exit( 1 ); exit( 1 );
@ -543,7 +545,7 @@ FT_Long check_digit_width( FT_Face face )
{ {
FT_Glyph_Metrics* metrics; FT_Glyph_Metrics* metrics;
FT_Load_Char(face, code, FT_LOAD_RENDER | FT_LOAD_NO_BITMAP); FT_Load_Char(face, code, ft_load_opts);
metrics = &face->glyph->metrics; metrics = &face->glyph->metrics;
if ((last_advance != -1 && last_advance != metrics->horiAdvance) || if ((last_advance != -1 && last_advance != metrics->horiAdvance) ||
@ -687,8 +689,7 @@ void convttf(char* path, char* destfile, FT_Long face_index)
{ {
charindex = getcharindex( face, code); charindex = getcharindex( face, code);
if ( !(charindex) ) continue; if ( !(charindex) ) continue;
err = FT_Load_Glyph( face, charindex, err = FT_Load_Glyph(face, charindex, ft_load_opts);
(FT_LOAD_RENDER | FT_LOAD_NO_BITMAP) );
if ( err ) continue; if ( err ) continue;
w = glyph_width( face, code, digit_width ); w = glyph_width( face, code, digit_width );
@ -770,8 +771,7 @@ void convttf(char* path, char* destfile, FT_Long face_index)
continue; continue;
} }
err = FT_Load_Glyph( face, charindex , err = FT_Load_Glyph(face, charindex, ft_load_opts);
(FT_LOAD_RENDER | FT_LOAD_NO_BITMAP) );
if ( err ) { if ( err ) {
continue; continue;
} }
@ -1254,6 +1254,9 @@ void getopts(int *pac, char ***pav)
while (*p && *p != ' ') while (*p && *p != ' ')
p++; p++;
break; break;
case 'L': /* Light rendering algorithm */
ft_load_opts |= FT_LOAD_TARGET_LIGHT;
break;
default: default:
fprintf(stderr, "Unknown option ignored: %s\n", p-1); fprintf(stderr, "Unknown option ignored: %s\n", p-1);