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Preparation for fixing scan conversion rules 4 and 6. 

* src/raster/ftraster.c (TFlow): Replace enumeration with...
(Flow_Up): This macro.
(TProfile): Replace `flow' member with `flags' bit field.
Update all affected code.
This commit is contained in:
Werner Lemberg 2009-06-05 10:37:15 +02:00
parent cbdba61511
commit 90c699af0c
2 changed files with 37 additions and 40 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2009-06-04 Werner Lemberg <wl@gnu.org>
Preparation for fixing scan conversion rules 4 and 6.
* src/raster/ftraster.c (TFlow): Replace enumeration with...
(Flow_Up): This macro.
(TProfile): Replace `flow' member with `flags' bit field.
Update all affected code.
2009-05-29 James Cloos <cloos@jhcloos.com>
Enable autohinting for glyphs rotated by multiples of 90°.

68
src/raster/ftraster.c
View File

@ -305,13 +305,7 @@
} TPoint;
typedef enum TFlow_
{
Flow_None = 0,
Flow_Up = 1,
Flow_Down = -1
} TFlow;
#define Flow_Up 0x1
/* States of each line, arc, and profile */
@ -330,18 +324,18 @@
struct TProfile_
{
FT_F26Dot6 X; /* current coordinate during sweep */
PProfile link; /* link to next profile - various purpose */
PLong offset; /* start of profile's data in render pool */
int flow; /* Profile orientation: Asc/Descending */
long height; /* profile's height in scanlines */
long start; /* profile's starting scanline */
FT_F26Dot6 X; /* current coordinate during sweep */
PProfile link; /* link to next profile (various purposes) */
PLong offset; /* start of profile's data in render pool */
unsigned flags; /* Bit 0: profile orientation: up/down */
long height; /* profile's height in scanlines */
long start; /* profile's starting scanline */
unsigned countL; /* number of lines to step before this */
/* profile becomes drawable */
unsigned countL; /* number of lines to step before this */
/* profile becomes drawable */
PProfile next; /* next profile in same contour, used */
/* during drop-out control */
PProfile next; /* next profile in same contour, used */
/* during drop-out control */
};
typedef PProfile TProfileList;
@ -454,7 +448,7 @@
UShort num_Profs; /* current number of profiles */
Bool fresh; /* signals a fresh new profile which */
/* 'start' field must be completed */
/* `start' field must be completed */
Bool joint; /* signals that the last arc ended */
/* exactly on a scanline. Allows */
/* removal of doublets */
@ -648,12 +642,12 @@
switch ( aState )
{
case Ascending_State:
ras.cProfile->flow = Flow_Up;
ras.cProfile->flags |= Flow_Up;
FT_TRACE6(( "New ascending profile = %lx\n", (long)ras.cProfile ));
break;
case Descending_State:
ras.cProfile->flow = Flow_Down;
ras.cProfile->flags &= ~Flow_Up;
FT_TRACE6(( "New descending profile = %lx\n", (long)ras.cProfile ));
break;
@ -823,23 +817,21 @@
else
p->link = NULL;
switch ( p->flow )
if ( p->flags & Flow_Up )
{
bottom = (Int)p->start;
top = (Int)( p->start + p->height - 1 );
}
else
{
case Flow_Down:
bottom = (Int)( p->start - p->height + 1 );
top = (Int)p->start;
p->start = bottom;
p->offset += p->height - 1;
break;
case Flow_Up:
default:
bottom = (Int)p->start;
top = (Int)( p->start + p->height - 1 );
}
if ( Insert_Y_Turn( RAS_VARS bottom ) ||
Insert_Y_Turn( RAS_VARS top + 1 ) )
if ( Insert_Y_Turn( RAS_VARS bottom ) ||
Insert_Y_Turn( RAS_VARS top + 1 ) )
return FAILURE;
p = p->link;
@ -1925,7 +1917,9 @@
if ( FRAC( ras.lastY ) == 0 &&
ras.lastY >= ras.minY &&
ras.lastY <= ras.maxY )
if ( ras.gProfile && ras.gProfile->flow == ras.cProfile->flow )
if ( ras.gProfile &&
( ras.gProfile->flags & Flow_Up ) ==
( ras.cProfile->flags & Flow_Up ) )
ras.top--;
/* Note that ras.gProfile can be nil if the contour was too small */
/* to be drawn. */
@ -2051,7 +2045,7 @@
while ( current )
{
current->X = *current->offset;
current->offset += current->flow;
current->offset += current->flags & Flow_Up ? 1 : -1;
current->height--;
current = current->link;
}
@ -2830,16 +2824,10 @@
{
DelOld( &waiting, P );
switch ( P->flow )
{
case Flow_Up:
if ( P->flags & Flow_Up )
InsNew( &draw_left, P );
break;
case Flow_Down:
else
InsNew( &draw_right, P );
break;
}
}
P = Q;