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[truetype] Fix degenerate case in S{P,F,DP}VTL opcodes. 

* src/truetype/ttinterp.c (Ins_SxVTL): Handle p1 == p2 specially.
(Ins_SDPVTL): Handle v1 == v2 specially.
This commit is contained in:
Werner Lemberg 2011-08-12 19:50:13 +02:00
parent b91e785308
commit bad0160c16
2 changed files with 33 additions and 3 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2011-08-12 Werner Lemberg <wl@gnu.org
[truetype] Fix degenerate case in S{P,F,DP}VTL opcodes.
* src/truetype/ttinterp.c (Ins_SxVTL): Handle p1 == p2 specially.
(Ins_SDPVTL): Handle v1 == v2 specially.
2011-08-09 Werner Lemberg <wl@gnu.org> 2011-08-09 Werner Lemberg <wl@gnu.org>
Fix Savannah bug #33975. Fix Savannah bug #33975.

29
src/truetype/ttinterp.c
View File

@ -2845,6 +2845,17 @@
A = p1->x - p2->x; A = p1->x - p2->x;
B = p1->y - p2->y; B = p1->y - p2->y;
/* If p1 == p2, SPVTL and SFVTL behave the same as */
/* SPVTCA[X] and SFVTCA[X], respectively. */
/* */
/* Confirmed by Greg Hitchcock. */
if ( A == 0 && B == 0 )
{
A = 0x4000;
aOpc = 0;
}
if ( ( aOpc & 1 ) != 0 ) if ( ( aOpc & 1 ) != 0 )
{ {
C = B; /* counter clockwise rotation */ C = B; /* counter clockwise rotation */
@ -5181,7 +5192,8 @@
Ins_SDPVTL( INS_ARG ) Ins_SDPVTL( INS_ARG )
{ {
FT_Long A, B, C; FT_Long A, B, C;
FT_UShort p1, p2; /* was FT_Int in pas type ERROR */ FT_UShort p1, p2; /* was FT_Int in pas type ERROR */
FT_Int aOpc = CUR.opcode;
p1 = (FT_UShort)args[1]; p1 = (FT_UShort)args[1];
@ -5202,9 +5214,20 @@
A = v1->x - v2->x; A = v1->x - v2->x;
B = v1->y - v2->y; B = v1->y - v2->y;
/* If v1 == v2, SDPVTL behaves the same as */
/* SVTCA[X], respectively. */
/* */
/* Confirmed by Greg Hitchcock. */
if ( A == 0 && B == 0 )
{
A = 0x4000;
aOpc = 0;
}
} }
if ( ( CUR.opcode & 1 ) != 0 ) if ( ( aOpc & 1 ) != 0 )
{ {
C = B; /* counter clockwise rotation */ C = B; /* counter clockwise rotation */
B = A; B = A;
@ -5222,7 +5245,7 @@
B = v1->y - v2->y; B = v1->y - v2->y;
} }
if ( ( CUR.opcode & 1 ) != 0 ) if ( ( aOpc & 1 ) != 0 )
{ {
C = B; /* counter clockwise rotation */ C = B; /* counter clockwise rotation */
B = A; B = A;