/* */
/* A new `perfect' anti-aliasing renderer (body). */
/* */
-/* Copyright 2000-2003, 2005-2012 by */
+/* Copyright 2000-2003, 2005-2014 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* */
/* - copy `src/smooth/ftgrays.c' (this file) to your current directory */
/* */
- /* - copy `include/freetype/ftimage.h' and `src/smooth/ftgrays.h' to the */
- /* same directory */
+ /* - copy `include/ftimage.h' and `src/smooth/ftgrays.h' to the same */
+ /* directory */
/* */
/* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */
/* */
#ifdef _STANDALONE_
+ /* Auxiliary macros for token concatenation. */
+#define FT_ERR_XCAT( x, y ) x ## y
+#define FT_ERR_CAT( x, y ) FT_ERR_XCAT( x, y )
+
+#define FT_BEGIN_STMNT do {
+#define FT_END_STMNT } while ( 0 )
+
+
/* define this to dump debugging information */
/* #define FT_DEBUG_LEVEL_TRACE */
va_end( ap );
}
+
+ /* empty function useful for setting a breakpoint to catch errors */
+ int
+ FT_Throw( int error,
+ int line,
+ const char* file )
+ {
+ FT_UNUSED( error );
+ FT_UNUSED( line );
+ FT_UNUSED( file );
+
+ return 0;
+ }
+
+
/* we don't handle tracing levels in stand-alone mode; */
#ifndef FT_TRACE5
#define FT_TRACE5( varformat ) FT_Message varformat
#define FT_ERROR( varformat ) FT_Message varformat
#endif
+#define FT_THROW( e ) \
+ ( FT_Throw( FT_ERR_CAT( ErrRaster, e ), \
+ __LINE__, \
+ __FILE__ ) | \
+ FT_ERR_CAT( ErrRaster, e ) )
+
#else /* !FT_DEBUG_LEVEL_TRACE */
#define FT_TRACE5( x ) do { } while ( 0 ) /* nothing */
#define FT_TRACE7( x ) do { } while ( 0 ) /* nothing */
#define FT_ERROR( x ) do { } while ( 0 ) /* nothing */
+#define FT_THROW( e ) FT_ERR_CAT( ErrRaster_, e )
+
#endif /* !FT_DEBUG_LEVEL_TRACE */
raster_done_ \
};
+
#else /* !_STANDALONE_ */
#include "ftspic.h"
-#define ErrRaster_Invalid_Mode Smooth_Err_Cannot_Render_Glyph
-#define ErrRaster_Invalid_Outline Smooth_Err_Invalid_Outline
+#define Smooth_Err_Invalid_Mode Smooth_Err_Cannot_Render_Glyph
+#define Smooth_Err_Memory_Overflow Smooth_Err_Out_Of_Memory
#define ErrRaster_Memory_Overflow Smooth_Err_Out_Of_Memory
-#define ErrRaster_Invalid_Argument Smooth_Err_Invalid_Argument
+
#endif /* !_STANDALONE_ */
+
#ifndef FT_MEM_SET
#define FT_MEM_SET( d, s, c ) ft_memset( d, s, c )
#endif
#endif
+ /* Compute `dividend / divisor' and return both its quotient and */
+ /* remainder, cast to a specific type. This macro also ensures that */
+ /* the remainder is always positive. */
+#define FT_DIV_MOD( type, dividend, divisor, quotient, remainder ) \
+ FT_BEGIN_STMNT \
+ (quotient) = (type)( (dividend) / (divisor) ); \
+ (remainder) = (type)( (dividend) % (divisor) ); \
+ if ( (remainder) < 0 ) \
+ { \
+ (quotient)--; \
+ (remainder) += (type)(divisor); \
+ } \
+ FT_END_STMNT
+
+#ifdef __arm__
+ /* Work around a bug specific to GCC which make the compiler fail to */
+ /* optimize a division and modulo operation on the same parameters */
+ /* into a single call to `__aeabi_idivmod'. See */
+ /* */
+ /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43721 */
+#undef FT_DIV_MOD
+#define FT_DIV_MOD( type, dividend, divisor, quotient, remainder ) \
+ FT_BEGIN_STMNT \
+ (quotient) = (type)( (dividend) / (divisor) ); \
+ (remainder) = (type)( (dividend) - (quotient) * (divisor) ); \
+ if ( (remainder) < 0 ) \
+ { \
+ (quotient)--; \
+ (remainder) += (type)(divisor); \
+ } \
+ FT_END_STMNT
+#endif /* __arm__ */
+
+
/*************************************************************************/
/* */
/* TYPE DEFINITIONS */
#endif /* PIXEL_BITS >= 8 */
- /* maximal number of gray spans in a call to the span callback */
+ /* maximum number of gray spans in a call to the span callback */
#define FT_MAX_GRAY_SPANS 32
} TCell;
+#if defined( _MSC_VER ) /* Visual C++ (and Intel C++) */
+ /* We disable the warning `structure was padded due to */
+ /* __declspec(align())' in order to compile cleanly with */
+ /* the maximum level of warnings. */
+#pragma warning( push )
+#pragma warning( disable : 4324 )
+#endif /* _MSC_VER */
+
typedef struct gray_TWorker_
{
+ ft_jmp_buf jump_buffer;
+
TCoord ex, ey;
TPos min_ex, max_ex;
TPos min_ey, max_ey;
int band_size;
int band_shoot;
- ft_jmp_buf jump_buffer;
-
void* buffer;
long buffer_size;
} gray_TWorker, *gray_PWorker;
+#if defined( _MSC_VER )
+#pragma warning( pop )
+#endif
+
#ifndef FT_STATIC_RASTER
#define ras (*worker)
static void
gray_record_cell( RAS_ARG )
{
- if ( !ras.invalid && ( ras.area | ras.cover ) )
+ if ( ras.area | ras.cover )
{
PCell cell = gray_find_cell( RAS_VAR );
ras.area = 0;
ras.cover = 0;
+ ras.ex = ex;
+ ras.ey = ey;
}
- ras.ex = ex;
- ras.ey = ey;
ras.invalid = ( (unsigned)ey >= (unsigned)ras.count_ey ||
ex >= ras.count_ex );
}
TPos x2,
TCoord y2 )
{
- TCoord ex1, ex2, fx1, fx2, delta, mod, lift, rem;
+ TCoord ex1, ex2, fx1, fx2, delta, mod;
long p, first, dx;
int incr;
dx = -dx;
}
- delta = (TCoord)( p / dx );
- mod = (TCoord)( p % dx );
- if ( mod < 0 )
- {
- delta--;
- mod += (TCoord)dx;
- }
+ FT_DIV_MOD( TCoord, p, dx, delta, mod );
ras.area += (TArea)(( fx1 + first ) * delta);
ras.cover += delta;
if ( ex1 != ex2 )
{
- p = ONE_PIXEL * ( y2 - y1 + delta );
- lift = (TCoord)( p / dx );
- rem = (TCoord)( p % dx );
- if ( rem < 0 )
- {
- lift--;
- rem += (TCoord)dx;
- }
+ TCoord lift, rem;
+
+
+ p = ONE_PIXEL * ( y2 - y1 + delta );
+ FT_DIV_MOD( TCoord, p, dx, lift, rem );
mod -= (int)dx;
dx = to_x - ras.x;
dy = to_y - ras.y;
- /* XXX: we should do something about the trivial case where dx == 0, */
- /* as it happens very often! */
-
/* perform vertical clipping */
{
TCoord min, max;
dy = -dy;
}
- delta = (int)( p / dy );
- mod = (int)( p % dy );
- if ( mod < 0 )
- {
- delta--;
- mod += (TCoord)dy;
- }
+ FT_DIV_MOD( int, p, dy, delta, mod );
x = ras.x + delta;
gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, (TCoord)first );
if ( ey1 != ey2 )
{
p = ONE_PIXEL * dx;
- lift = (int)( p / dy );
- rem = (int)( p % dy );
- if ( rem < 0 )
- {
- lift--;
- rem += (int)dy;
- }
+ FT_DIV_MOD( int, p, dy, lift, rem );
mod -= (int)dy;
while ( ey1 != ey2 )
/* dx and dy are x and y components of the P0-P3 chord vector. */
- dx = arc[3].x - arc[0].x;
- dy = arc[3].y - arc[0].y;
-
- /* L is an (under)estimate of the Euclidean distance P0-P3. */
- /* */
- /* If dx >= dy, then r = sqrt(dx^2 + dy^2) can be overestimated */
- /* with least maximum error by */
- /* */
- /* r_upperbound = dx + (sqrt(2) - 1) * dy , */
- /* */
- /* where sqrt(2) - 1 can be (over)estimated by 107/256, giving an */
- /* error of no more than 8.4%. */
- /* */
- /* Similarly, some elementary calculus shows that r can be */
- /* underestimated with least maximum error by */
- /* */
- /* r_lowerbound = sqrt(2 + sqrt(2)) / 2 * dx */
- /* + sqrt(2 - sqrt(2)) / 2 * dy . */
- /* */
- /* 236/256 and 97/256 are (under)estimates of the two algebraic */
- /* numbers, giving an error of no more than 8.1%. */
-
- dx_ = FT_ABS( dx );
- dy_ = FT_ABS( dy );
-
- /* This is the same as */
- /* */
- /* L = ( 236 * FT_MAX( dx_, dy_ ) */
- /* + 97 * FT_MIN( dx_, dy_ ) ) >> 8; */
- L = ( dx_ > dy_ ? 236 * dx_ + 97 * dy_
- : 97 * dx_ + 236 * dy_ ) >> 8;
+ dx = dx_ = arc[3].x - arc[0].x;
+ dy = dy_ = arc[3].y - arc[0].y;
+
+ L = FT_HYPOT( dx_, dy_ );
/* Avoid possible arithmetic overflow below by splitting. */
if ( L > 32767 )
if ( s > s_limit )
goto Split;
- /* If P1 or P2 is outside P0-P3, split the curve. */
- if ( dy * dy1 + dx * dx1 < 0 ||
- dy * dy2 + dx * dx2 < 0 ||
- dy * (arc[3].y - arc[1].y) + dx * (arc[3].x - arc[1].x) < 0 ||
- dy * (arc[3].y - arc[2].y) + dx * (arc[3].x - arc[2].x) < 0 )
+ /* Split super curvy segments where the off points are so far
+ from the chord that the angles P0-P1-P3 or P0-P2-P3 become
+ acute as detected by appropriate dot products. */
+ if ( dx1 * ( dx1 - dx ) + dy1 * ( dy1 - dy ) > 0 ||
+ dx2 * ( dx2 - dx ) + dy2 * ( dy2 - dy ) > 0 )
goto Split;
/* No reason to split. */
/* record current cell, if any */
- gray_record_cell( RAS_VAR );
+ if ( !ras.invalid )
+ gray_record_cell( RAS_VAR );
/* start to a new position */
x = UPSCALE( to->x );
TPos area,
TCoord acount )
{
- FT_Span* span;
- int count;
- int coverage;
+ int coverage;
/* compute the coverage line's coverage, depending on the */
if ( coverage )
{
+ FT_Span* span;
+ int count;
+
+
/* see whether we can add this span to the current list */
count = ras.num_gray_spans;
span = ras.gray_spans + count - 1;
ras.num_gray_spans = 0;
ras.span_y = (int)y;
- count = 0;
span = ras.gray_spans;
}
else
ras.render_span( ras.span_y, ras.num_gray_spans,
ras.gray_spans, ras.render_span_data );
+#ifdef FT_DEBUG_LEVEL_TRACE
+
+ if ( ras.num_gray_spans > 0 )
+ {
+ FT_Span* span;
+ int n;
+
+
+ FT_TRACE7(( "y = %3d ", ras.span_y ));
+ span = ras.gray_spans;
+ for ( n = 0; n < ras.num_gray_spans; n++, span++ )
+ FT_TRACE7(( "[%d..%d]:%02x ",
+ span->x, span->x + span->len - 1, span->coverage ));
+ FT_TRACE7(( "\n" ));
+ }
+
FT_TRACE7(( "gray_sweep: end\n" ));
+
+#endif /* FT_DEBUG_LEVEL_TRACE */
+
}
TPos delta;
- if ( !outline || !func_interface )
- return ErrRaster_Invalid_Argument;
+ if ( !outline )
+ return FT_THROW( Invalid_Outline );
+
+ if ( !func_interface )
+ return FT_THROW( Invalid_Argument );
shift = func_interface->shift;
delta = func_interface->delta;
return error;
Invalid_Outline:
- return ErrRaster_Invalid_Outline;
+ return FT_THROW( Invalid_Outline );
}
#endif /* _STANDALONE_ */
if ( ft_setjmp( ras.jump_buffer ) == 0 )
{
error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );
- gray_record_cell( RAS_VAR );
+ if ( !ras.invalid )
+ gray_record_cell( RAS_VAR );
}
else
- error = ErrRaster_Memory_Overflow;
+ error = FT_THROW( Memory_Overflow );
return error;
}
if ( !raster || !raster->buffer || !raster->buffer_size )
- return ErrRaster_Invalid_Argument;
+ return FT_THROW( Invalid_Argument );
if ( !outline )
- return ErrRaster_Invalid_Outline;
+ return FT_THROW( Invalid_Outline );
/* return immediately if the outline is empty */
if ( outline->n_points == 0 || outline->n_contours <= 0 )
return 0;
if ( !outline->contours || !outline->points )
- return ErrRaster_Invalid_Outline;
+ return FT_THROW( Invalid_Outline );
if ( outline->n_points !=
outline->contours[outline->n_contours - 1] + 1 )
- return ErrRaster_Invalid_Outline;
+ return FT_THROW( Invalid_Outline );
worker = raster->worker;
if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
{
if ( !target_map )
- return ErrRaster_Invalid_Argument;
+ return FT_THROW( Invalid_Argument );
/* nothing to do */
if ( !target_map->width || !target_map->rows )
return 0;
if ( !target_map->buffer )
- return ErrRaster_Invalid_Argument;
+ return FT_THROW( Invalid_Argument );
}
/* this version does not support monochrome rendering */
if ( !( params->flags & FT_RASTER_FLAG_AA ) )
- return ErrRaster_Invalid_Mode;
+ return FT_THROW( Invalid_Mode );
/* compute clipping box */
if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
}
+ static int
+ gray_raster_set_mode( FT_Raster raster,
+ unsigned long mode,
+ void* args )
+ {
+ FT_UNUSED( raster );
+ FT_UNUSED( mode );
+ FT_UNUSED( args );
+
+
+ return 0; /* nothing to do */
+ }
+
+
FT_DEFINE_RASTER_FUNCS(ft_grays_raster,
FT_GLYPH_FORMAT_OUTLINE,
(FT_Raster_New_Func) gray_raster_new,
(FT_Raster_Reset_Func) gray_raster_reset,
- (FT_Raster_Set_Mode_Func)0,
+ (FT_Raster_Set_Mode_Func)gray_raster_set_mode,
(FT_Raster_Render_Func) gray_raster_render,
(FT_Raster_Done_Func) gray_raster_done
)
projects / framework / graphics / freetype.git / blobdiff