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In function cff_parse_font_matrix, added logic to get the units_per_EM

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from the FontMatrix.

Added a new function (cff_parse_fixed_thousand) that gets a real
number fromt he CFF font, but multiplies by 1000 (this is to avoid
rounding errors when placing this real number into a 16.16 fixed
number).

In function cff_parse_real, added code so that the integer part is
moved into the high sixtenn bits of the 16.16 fixed number.
This commit is contained in:
Tom Kacvinsky 2001-02-07 01:11:54 +00:00
parent 9df36e4718
commit 91f450c295
1 changed files with 23 additions and 7 deletions
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30
src/cff/cffparse.c
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@ -267,8 +267,12 @@
power_ten++;
}
/* Move the integer part into the high 16 bits. */
result <<= 16;
/* Place the decimal part into the low 16 bits. */
if ( num )
result += FT_DivFix( num, divider );
result |= FT_DivFix( num, divider );
if ( sign )
result = -result;
@ -299,6 +303,14 @@
: cff_parse_integer( d[0], d[1] ) << 16 );
}
/* read a floating point number, either integer or real, */
/* but return 1000 times the number read in. */
static
FT_Fixed cff_parse_fixed_thousand( FT_Byte** d )
{
return ( **d == 30 ? cff_parse_real ( d[0], d[1], 3 )
: (FT_Fixed)FT_MulFix ( cff_parse_integer( d[0], d[1] ) << 16, 1000 ) );
}
static
FT_Error cff_parse_font_matrix( CFF_Parser* parser )
@ -306,6 +318,7 @@
CFF_Font_Dict* dict = (CFF_Font_Dict*)parser->object;
FT_Matrix* matrix = &dict->font_matrix;
FT_Vector* offset = &dict->font_offset;
FT_UShort* upm = &dict->units_per_em;
FT_Byte** data = parser->stack;
FT_Error error;
FT_Fixed temp;
@ -315,15 +328,18 @@
if ( parser->top >= parser->stack + 6 )
{
matrix->xx = cff_parse_fixed( data++ );
matrix->yx = cff_parse_fixed( data++ );
matrix->xy = cff_parse_fixed( data++ );
matrix->yy = cff_parse_fixed( data++ );
offset->x = cff_parse_fixed( data++ );
offset->y = cff_parse_fixed( data );
matrix->xx = cff_parse_fixed_thousand( data++ );
matrix->yx = cff_parse_fixed_thousand( data++ );
matrix->xy = cff_parse_fixed_thousand( data++ );
matrix->yy = cff_parse_fixed_thousand( data++ );
offset->x = cff_parse_fixed_thousand( data++ );
offset->y = cff_parse_fixed_thousand( data );
temp = ABS( matrix->yy );
*upm = (FT_UShort)FT_DivFix( 0x10000L, FT_DivFix( temp, 1000 ) );
fprintf (stderr, "cff_parse_font_matrix: matrix->xx = %08lX, upm = %d\n", matrix->xx, *upm) ;
if ( temp != 0x10000L )
{
matrix->xx = FT_DivFix( matrix->xx, temp );