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[truetype] Make SHC instruction behave similar to MS rasterizer. 

* src/truetype/ttinterp.c (Ins_SHC): Handle virtual contour in
twilight zone.
This commit is contained in:
Werner Lemberg 2012-02-29 14:47:47 +01:00
parent d74285d1dc
commit 9eacbb81bd
2 changed files with 25 additions and 19 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-02-29 Werner Lemberg <wl@gnu.org>
[truetype] Make SHC instruction behave similar to MS rasterizer.
* src/truetype/ttinterp.c (Ins_SHC): Handle virtual contour in
twilight zone.
2012-02-29 Alexei Podtelezhnikov <apodtele@gmail.com>
Avoid modulo operators against a power-of-two denominator.

37
src/truetype/ttinterp.c
View File

@ -5770,6 +5770,10 @@
/* Opcode range: 0x34-35 */
/* Stack: uint32 --> */
/* */
/* UNDOCUMENTED: According to Greg Hitchcock, there is one (virtual) */
/* contour in the twilight zone, namely contour number */
/* zero. */
/* */
static void
Ins_SHC( INS_ARG )
{
@ -5777,13 +5781,14 @@
FT_UShort refp;
FT_F26Dot6 dx, dy;
FT_Short contour;
FT_UShort first_point, last_point, i;
FT_Short contour, bounds;
FT_UShort start, limit, i;
contour = (FT_UShort)args[0];
bounds = ( CUR.GS.gep2 == 0 ) ? 1 : CUR.zp2.n_contours;
if ( BOUNDS( contour, CUR.pts.n_contours ) )
if ( BOUNDS( contour, bounds ) )
{
if ( CUR.pedantic_hinting )
CUR.error = TT_Err_Invalid_Reference;
@ -5794,25 +5799,19 @@
return;
if ( contour == 0 )
first_point = 0;
start = 0;
else
first_point = (FT_UShort)( CUR.pts.contours[contour - 1] + 1 -
CUR.pts.first_point );
start = (FT_UShort)( CUR.zp2.contours[contour - 1] + 1 -
CUR.zp2.first_point );
last_point = (FT_UShort)( CUR.pts.contours[contour] -
CUR.pts.first_point );
/* we use the number of points if in the twilight zone */
if ( CUR.GS.gep2 == 0 )
limit = CUR.zp2.n_points;
else
limit = (FT_UShort)( CUR.zp2.contours[contour] -
CUR.zp2.first_point + 1 );
/* XXX: this is probably wrong... at least it prevents memory */
/* corruption when zp2 is the twilight zone */
if ( BOUNDS( last_point, CUR.zp2.n_points ) )
{
if ( CUR.zp2.n_points > 0 )
last_point = (FT_UShort)(CUR.zp2.n_points - 1);
else
last_point = 0;
}
for ( i = first_point; i <= last_point; i++ )
for ( i = start; i < limit; i++ )
{
if ( zp.cur != CUR.zp2.cur || refp != i )
MOVE_Zp2_Point( i, dx, dy, TRUE );