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ector: updated the freetype raster with faster line renderer. 

Merged from freetype repo with 'smooth', faster, alternative line renderer.

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>
This commit is contained in:
Subhransu Mohanty 2015-10-29 16:59:51 +09:00 committed by Cedric BAIL
parent a6e168675d
commit da47b4df13
1 changed files with 119 additions and 220 deletions
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339
src/static_libs/freetype/sw_ft_raster.c
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@ -71,8 +71,10 @@
#include <string.h>
#include <setjmp.h>
#include <limits.h>
#define SW_FT_UINT_MAX UINT_MAX
#define SW_FT_INT_MAX INT_MAX
#define SW_FT_UINT_MAX UINT_MAX
#define SW_FT_INT_MAX INT_MAX
#define SW_FT_ULONG_MAX ULONG_MAX
#define SW_FT_CHAR_BIT CHAR_BIT
#define ft_memset memset
@ -268,6 +270,14 @@ typedef struct SW_FT_Outline_Funcs_
SW_FT_END_STMNT
#endif /* __arm__ */
/* These macros speed up repetitive divisions by replacing them */
/* with multiplications and right shifts. */
#define SW_FT_UDIVPREP( b ) \
long b ## _r = (long)( SW_FT_ULONG_MAX >> PIXEL_BITS ) / ( b )
#define SW_FT_UDIV( a, b ) \
( ( (unsigned long)( a ) * (unsigned long)( b ## _r ) ) >> \
( sizeof( long ) * SW_FT_CHAR_BIT - PIXEL_BITS ) )
/*************************************************************************/
/* */
@ -584,251 +594,140 @@ typedef struct SW_FT_Outline_Funcs_
gray_set_cell( RAS_VAR_ ex, ey );
}
/*************************************************************************/
/* */
/* Render a scanline as one or more cells. */
/* */
static void
gray_render_scanline( RAS_ARG_ TCoord ey,
TPos x1,
TCoord y1,
TPos x2,
TCoord y2 )
{
TCoord ex1, ex2, fx1, fx2, delta, mod;
long p, first, dx;
int incr;
dx = x2 - x1;
ex1 = TRUNC( x1 );
ex2 = TRUNC( x2 );
fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
/* trivial case. Happens often */
if ( y1 == y2 )
{
gray_set_cell( RAS_VAR_ ex2, ey );
return;
}
/* everything is located in a single cell. That is easy! */
/* */
if ( ex1 == ex2 )
{
delta = y2 - y1;
ras.area += (TArea)(( fx1 + fx2 ) * delta);
ras.cover += delta;
return;
}
/* ok, we'll have to render a run of adjacent cells on the same */
/* scanline... */
/* */
p = ( ONE_PIXEL - fx1 ) * ( y2 - y1 );
first = ONE_PIXEL;
incr = 1;
if ( dx < 0 )
{
p = fx1 * ( y2 - y1 );
first = 0;
incr = -1;
dx = -dx;
}
SW_FT_DIV_MOD( TCoord, p, dx, delta, mod );
ras.area += (TArea)(( fx1 + first ) * delta);
ras.cover += delta;
ex1 += incr;
gray_set_cell( RAS_VAR_ ex1, ey );
y1 += delta;
if ( ex1 != ex2 )
{
TCoord lift, rem;
p = ONE_PIXEL * ( y2 - y1 + delta );
SW_FT_DIV_MOD( TCoord, p, dx, lift, rem );
mod -= (int)dx;
while ( ex1 != ex2 )
{
delta = lift;
mod += rem;
if ( mod >= 0 )
{
mod -= (TCoord)dx;
delta++;
}
ras.area += (TArea)(ONE_PIXEL * delta);
ras.cover += delta;
y1 += delta;
ex1 += incr;
gray_set_cell( RAS_VAR_ ex1, ey );
}
}
delta = y2 - y1;
ras.area += (TArea)(( fx2 + ONE_PIXEL - first ) * delta);
ras.cover += delta;
}
/*************************************************************************/
/* */
/* Render a given line as a series of scanlines. */
/* Render a straight line across multiple cells in any direction. */
/* */
static void
gray_render_line( RAS_ARG_ TPos to_x,
TPos to_y )
{
TCoord ey1, ey2, fy1, fy2, mod;
TPos dx, dy, x, x2;
long p, first;
int delta, rem, lift, incr;
TPos dx, dy, fx1, fy1, fx2, fy2;
TCoord ex1, ex2, ey1, ey2;
ey1 = TRUNC( ras.last_ey );
ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */
fy1 = (TCoord)( ras.y - ras.last_ey );
fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );
ex1 = TRUNC( ras.x );
ex2 = TRUNC( to_x );
ey1 = TRUNC( ras.y );
ey2 = TRUNC( to_y );
/* perform vertical clipping */
if ( ( ey1 >= ras.max_ey && ey2 >= ras.max_ey ) ||
( ey1 < ras.min_ey && ey2 < ras.min_ey ) )
goto End;
dx = to_x - ras.x;
dy = to_y - ras.y;
/* perform vertical clipping */
fx1 = ras.x - SUBPIXELS( ex1 );
fy1 = ras.y - SUBPIXELS( ey1 );
if ( ex1 == ex2 && ey1 == ey2 ) /* inside one cell */
;
else if ( dy == 0 ) /* ex1 != ex2 */ /* any horizontal line */
{
TCoord min, max;
min = ey1;
max = ey2;
if ( ey1 > ey2 )
{
min = ey2;
max = ey1;
}
if ( min >= ras.max_ey || max < ras.min_ey )
goto End;
ex1 = ex2;
gray_set_cell( RAS_VAR_ ex1, ey1 );
}
/* everything is on a single scanline */
if ( ey1 == ey2 )
else if ( dx == 0 )
{
gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 );
goto End;
}
/* vertical line - avoid calling gray_render_scanline */
incr = 1;
if ( dx == 0 )
{
TCoord ex = TRUNC( ras.x );
TCoord two_fx = (TCoord)( ( ras.x - SUBPIXELS( ex ) ) << 1 );
TArea area;
first = ONE_PIXEL;
if ( dy < 0 )
{
first = 0;
incr = -1;
}
delta = (int)( first - fy1 );
ras.area += (TArea)two_fx * delta;
ras.cover += delta;
ey1 += incr;
gray_set_cell( RAS_VAR_ ex, ey1 );
delta = (int)( first + first - ONE_PIXEL );
area = (TArea)two_fx * delta;
while ( ey1 != ey2 )
{
ras.area += area;
ras.cover += delta;
ey1 += incr;
gray_set_cell( RAS_VAR_ ex, ey1 );
}
delta = (int)( fy2 - ONE_PIXEL + first );
ras.area += (TArea)two_fx * delta;
ras.cover += delta;
goto End;
}
/* ok, we have to render several scanlines */
p = ( ONE_PIXEL - fy1 ) * dx;
first = ONE_PIXEL;
incr = 1;
if ( dy < 0 )
{
p = fy1 * dx;
first = 0;
incr = -1;
dy = -dy;
}
SW_FT_DIV_MOD( int, p, dy, delta, mod );
x = ras.x + delta;
gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, (TCoord)first );
ey1 += incr;
gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
if ( ey1 != ey2 )
{
p = ONE_PIXEL * dx;
SW_FT_DIV_MOD( int, p, dy, lift, rem );
mod -= (int)dy;
while ( ey1 != ey2 )
{
delta = lift;
mod += rem;
if ( mod >= 0 )
if ( dy > 0 ) /* vertical line up */
do
{
mod -= (int)dy;
delta++;
fy2 = ONE_PIXEL;
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * fx1 * 2;
fy1 = 0;
ey1++;
gray_set_cell( RAS_VAR_ ex1, ey1 );
} while ( ey1 != ey2 );
else /* vertical line down */
do
{
fy2 = 0;
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * fx1 * 2;
fy1 = ONE_PIXEL;
ey1--;
gray_set_cell( RAS_VAR_ ex1, ey1 );
} while ( ey1 != ey2 );
}
else /* any other line */
{
TArea prod = dx * fy1 - dy * fx1;
SW_FT_UDIVPREP( dx );
SW_FT_UDIVPREP( dy );
/* The fundamental value `prod' determines which side and the */
/* exact coordinate where the line exits current cell. It is */
/* also easily updated when moving from one cell to the next. */
do
{
if ( prod <= 0 &&
prod - dx * ONE_PIXEL > 0 ) /* left */
{
fx2 = 0;
fy2 = (TPos)SW_FT_UDIV( -prod, -dx );
prod -= dy * ONE_PIXEL;
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * ( fx1 + fx2 );
fx1 = ONE_PIXEL;
fy1 = fy2;
ex1--;
}
else if ( prod - dx * ONE_PIXEL <= 0 &&
prod - dx * ONE_PIXEL + dy * ONE_PIXEL > 0 ) /* up */
{
prod -= dx * ONE_PIXEL;
fx2 = (TPos)SW_FT_UDIV( -prod, dy );
fy2 = ONE_PIXEL;
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * ( fx1 + fx2 );
fx1 = fx2;
fy1 = 0;
ey1++;
}
else if ( prod - dx * ONE_PIXEL + dy * ONE_PIXEL <= 0 &&
prod + dy * ONE_PIXEL >= 0 ) /* right */
{
prod += dy * ONE_PIXEL;
fx2 = ONE_PIXEL;
fy2 = (TPos)SW_FT_UDIV( prod, dx );
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * ( fx1 + fx2 );
fx1 = 0;
fy1 = fy2;
ex1++;
}
else /* ( prod + dy * ONE_PIXEL < 0 &&
prod > 0 ) down */
{
fx2 = (TPos)SW_FT_UDIV( prod, -dy );
fy2 = 0;
prod += dx * ONE_PIXEL;
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * ( fx1 + fx2 );
fx1 = fx2;
fy1 = ONE_PIXEL;
ey1--;
}
x2 = x + delta;
gray_render_scanline( RAS_VAR_ ey1, x,
(TCoord)( ONE_PIXEL - first ), x2,
(TCoord)first );
x = x2;
ey1 += incr;
gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
}
gray_set_cell( RAS_VAR_ ex1, ey1 );
} while ( ex1 != ex2 || ey1 != ey2 );
}
gray_render_scanline( RAS_VAR_ ey1, x,
(TCoord)( ONE_PIXEL - first ), to_x,
fy2 );
fx2 = to_x - SUBPIXELS( ex2 );
fy2 = to_y - SUBPIXELS( ey2 );
ras.cover += ( fy2 - fy1 );
ras.area += ( fy2 - fy1 ) * ( fx1 + fx2 );
End:
ras.x = to_x;
ras.y = to_y;
ras.last_ey = SUBPIXELS( ey2 );
}
static void
gray_split_conic( SW_FT_Vector* base )
{