diff options
Diffstat (limited to 'src/smooth/ftgrays.c')
| -rw-r--r-- | src/smooth/ftgrays.c | 102 |
1 files changed, 78 insertions, 24 deletions
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c index 4c0eea5..d2158e7 100644 --- a/src/smooth/ftgrays.c +++ b/src/smooth/ftgrays.c @@ -4,7 +4,7 @@ /* */ /* A new `perfect' anti-aliasing renderer (body). */ /* */ -/* Copyright 2000-2003, 2005-2012 by */ +/* Copyright 2000-2003, 2005-2013 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ @@ -94,6 +94,11 @@ #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 this to dump debugging information */ /* #define FT_DEBUG_LEVEL_TRACE */ @@ -154,6 +159,21 @@ typedef ptrdiff_t FT_PtrDist; 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 @@ -165,11 +185,19 @@ typedef ptrdiff_t FT_PtrDist; #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 */ @@ -202,6 +230,7 @@ typedef ptrdiff_t FT_PtrDist; raster_done_ \ }; + #else /* !_STANDALONE_ */ @@ -215,13 +244,14 @@ typedef ptrdiff_t FT_PtrDist; #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 @@ -312,7 +342,7 @@ typedef ptrdiff_t FT_PtrDist; #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 @@ -600,7 +630,7 @@ typedef ptrdiff_t FT_PtrDist; 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; @@ -661,6 +691,9 @@ typedef ptrdiff_t FT_PtrDist; if ( ex1 != ex2 ) { + TCoord lift, rem; + + p = ONE_PIXEL * ( y2 - y1 + delta ); lift = (TCoord)( p / dx ); rem = (TCoord)( p % dx ); @@ -1091,11 +1124,11 @@ typedef ptrdiff_t FT_PtrDist; 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. */ @@ -1227,9 +1260,7 @@ typedef ptrdiff_t FT_PtrDist; TPos area, TCoord acount ) { - FT_Span* span; - int count; - int coverage; + int coverage; /* compute the coverage line's coverage, depending on the */ @@ -1271,6 +1302,10 @@ typedef ptrdiff_t FT_PtrDist; 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; @@ -1400,7 +1435,26 @@ typedef ptrdiff_t FT_PtrDist; 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 */ + } @@ -1467,7 +1521,7 @@ typedef ptrdiff_t FT_PtrDist; if ( !outline || !func_interface ) - return ErrRaster_Invalid_Argument; + return FT_THROW( Invalid_Argument ); shift = func_interface->shift; delta = func_interface->delta; @@ -1680,7 +1734,7 @@ typedef ptrdiff_t FT_PtrDist; return error; Invalid_Outline: - return ErrRaster_Invalid_Outline; + return FT_THROW( Invalid_Outline ); } #endif /* _STANDALONE_ */ @@ -1718,7 +1772,7 @@ typedef ptrdiff_t FT_PtrDist; gray_record_cell( RAS_VAR ); } else - error = ErrRaster_Memory_Overflow; + error = FT_THROW( Memory_Overflow ); return error; } @@ -1871,21 +1925,21 @@ typedef ptrdiff_t FT_PtrDist; 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; @@ -1893,19 +1947,19 @@ typedef ptrdiff_t FT_PtrDist; 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 ) ) |