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* src/smooth/ftgrays.c: minor source cleanups and optimization

This commit is contained in:
David Turner 2006-09-05 12:17:38 +00:00
parent 772e55d38e
commit c7bc9b7907
2 changed files with 59 additions and 42 deletions
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5
ChangeLog
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@ -1,7 +1,10 @@
2006-09-05 David Turner <david@freetype.org>
* src/smooth/ftgrays.c: minor source cleanups and optimization
* src/smooth/ftgrays.c (gray_sweep): Avoid buffer overwrites
when to the end of a bitmap scanline. The fun never ends ;-)
when to drawing the end of a bitmap scanline. The fun never ends ;-)
2006-09-04 David Turner <david@freetype.org>

96
src/smooth/ftgrays.c
View File

@ -207,13 +207,6 @@
#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )
#endif
/* Define this if you want to use a more compact storage scheme. This */
/* increases the number of cells available in the render pool but slows */
/* down the rendering a bit. It is useful if you have a really tiny */
/* render pool. */
#undef GRAYS_COMPACT
/*************************************************************************/
/* */
/* TYPE DEFINITIONS */
@ -264,18 +257,19 @@ typedef struct TCell_
typedef struct TRaster_
{
PCell cells;
int max_cells;
int num_cells;
TCoord ex, ey;
TPos min_ex, max_ex;
TPos min_ey, max_ey;
TPos count_ex, count_ey;
TArea area;
int cover;
int invalid;
TCoord ex, ey;
PCell cells;
int max_cells;
int num_cells;
TCoord cx, cy;
TPos x, y;
@ -382,13 +376,13 @@ typedef struct TCell_
/* Record the current cell in the table. */
/* */
static PCell
gray_find_cell( RAS_ARG_ TCoord x,
TCoord y )
gray_find_cell( RAS_ARG )
{
PCell *pcell, cell;
int x = ras.ex;
pcell = &ras.ycells[y];
pcell = &ras.ycells[ ras.ey ];
for (;;)
{
cell = *pcell;
@ -422,9 +416,7 @@ typedef struct TCell_
{
if ( !ras.invalid && (ras.area | ras.cover) )
{
TCoord x = (TCoord)( ras.ex - ras.min_ex );
TCoord y = (TCoord)( ras.ey - ras.min_ey );
PCell cell = gray_find_cell( RAS_VAR_ x, y );
PCell cell = gray_find_cell( RAS_VAR );
cell->area += ras.area;
cell->cover += ras.cover;
@ -440,9 +432,6 @@ typedef struct TCell_
gray_set_cell( RAS_ARG_ TCoord ex,
TCoord ey )
{
int invalid, record, clean;
/* Move the cell pointer to a new position. We set the `invalid' */
/* flag to indicate that the cell isn't part of those we're interested */
/* in during the render phase. This means that: */
@ -455,8 +444,10 @@ typedef struct TCell_
/* All cells that are on the left of the clipping region go to the */
/* min_ex - 1 horizontal position. */
if ( ex < ras.min_ex )
ex = (TCoord)(ras.min_ex - 1);
ey -= ras.min_ey;
ex -= ras.min_ex;
if ( ex < 0 )
ex = -1;
/* are we moving to a different cell ? */
if ( ex != ras.ex || ey != ras.ey )
@ -469,9 +460,10 @@ typedef struct TCell_
ras.cover = 0;
}
ras.invalid = ( ey < ras.min_ey || ey >= ras.max_ey || ex >= ras.max_ex );
ras.ex = ex;
ras.ey = ey;
ras.invalid = ( (unsigned)ey >= (unsigned)ras.count_ey ||
ex >= ras.count_ex );
}
@ -488,8 +480,8 @@ typedef struct TCell_
ras.area = 0;
ras.cover = 0;
ras.ex = ex;
ras.ey = ey;
ras.ex = ex - ras.min_ex;
ras.ey = ey - ras.min_ey;
ras.last_ey = SUBPIXELS( ey );
ras.invalid = 0;
@ -515,8 +507,8 @@ typedef struct TCell_
dx = x2 - x1;
ex1 = TRUNC( x1 ); /* if (ex1 >= ras.max_ex) ex1 = ras.max_ex-1; */
ex2 = TRUNC( x2 ); /* if (ex2 >= ras.max_ex) ex2 = ras.max_ex-1; */
ex1 = TRUNC( x1 );
ex2 = TRUNC( x2 );
fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
@ -1113,16 +1105,31 @@ typedef struct TCell_
if ( coverage )
#if 1
FT_MEM_SET( p + spans->x, (unsigned char)coverage, spans->len );
#else /* 1 */
{
q = p + spans->x;
limit = q + spans->len;
for ( ; q < limit; q++ )
q[0] = (unsigned char)coverage;
/* for small-spans, it's faster to do it ourselves than
* calling memset. this is mainly due to the cost of the
* function call.
*/
if ( spans->len >= 8 )
FT_MEM_SET( p + spans->x, (unsigned char)coverage, spans->len );
else
{
unsigned char* q = p + spans->x;
switch ( spans->len )
{
case 7: *q++ = (unsigned char)coverage;
case 6: *q++ = (unsigned char)coverage;
case 5: *q++ = (unsigned char)coverage;
case 4: *q++ = (unsigned char)coverage;
case 3: *q++ = (unsigned char)coverage;
case 2: *q++ = (unsigned char)coverage;
case 1: *q = (unsigned char)coverage;
default:
;
}
}
}
#endif /* 1 */
}
}
@ -1223,7 +1230,9 @@ typedef struct TCell_
}
#if 1
#ifdef DEBUG_GRAYS
/* to be called while in the debugger */
gray_dump_cells( RAS_ARG )
{
int yindex;
@ -1239,7 +1248,9 @@ typedef struct TCell_
printf( "\n" );
}
}
#endif
#endif /* DEBUG_GRAYS */
static void
gray_sweep( RAS_ARG_ const FT_Bitmap* target )
@ -1281,7 +1292,7 @@ typedef struct TCell_
if ( cover != 0 )
gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
(ras.max_ex - ras.min_ex) - x );
ras.count_ex - x );
}
if ( ras.render_span && ras.num_gray_spans > 0 )
@ -1597,6 +1608,9 @@ typedef struct TCell_
if ( ras.max_ex > clip->xMax ) ras.max_ex = clip->xMax;
if ( ras.max_ey > clip->yMax ) ras.max_ey = clip->yMax;
ras.count_ex = ras.max_ex - ras.min_ex;
ras.count_ey = ras.max_ey - ras.min_ey;
/* simple heuristic used to speed-up the bezier decomposition -- see */
/* the code in gray_render_conic() and gray_render_cubic() for more */
/* details */
@ -1607,9 +1621,9 @@ typedef struct TCell_
int level = 0;
if ( ras.max_ex > 24 || ras.max_ey > 24 )
if ( ras.count_ex > 24 || ras.count_ey > 24 )
level++;
if ( ras.max_ex > 120 || ras.max_ey > 120 )
if ( ras.count_ex > 120 || ras.count_ey > 120 )
level++;
ras.conic_level <<= level;