| Index: third_party/freetype2/src/src/smooth/ftgrays.c
|
| diff --git a/third_party/freetype2/src/src/smooth/ftgrays.c b/third_party/freetype2/src/src/smooth/ftgrays.c
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..9a43c0749c035dbf72a8f6c229af2bacdba8fcb1
|
| --- /dev/null
|
| +++ b/third_party/freetype2/src/src/smooth/ftgrays.c
|
| @@ -0,0 +1,2265 @@
|
| +/***************************************************************************/
|
| +/* */
|
| +/* ftgrays.c */
|
| +/* */
|
| +/* A new `perfect' anti-aliasing renderer (body). */
|
| +/* */
|
| +/* Copyright 2000-2015 by */
|
| +/* David Turner, Robert Wilhelm, and Werner Lemberg. */
|
| +/* */
|
| +/* This file is part of the FreeType project, and may only be used, */
|
| +/* modified, and distributed under the terms of the FreeType project */
|
| +/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
|
| +/* this file you indicate that you have read the license and */
|
| +/* understand and accept it fully. */
|
| +/* */
|
| +/***************************************************************************/
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* This file can be compiled without the rest of the FreeType engine, by */
|
| + /* defining the _STANDALONE_ macro when compiling it. You also need to */
|
| + /* put the files `ftgrays.h' and `ftimage.h' into the current */
|
| + /* compilation directory. Typically, you could do something like */
|
| + /* */
|
| + /* - 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 */
|
| + /* */
|
| + /* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */
|
| + /* */
|
| + /* cc -c -D_STANDALONE_ ftgrays.c */
|
| + /* */
|
| + /* The renderer can be initialized with a call to */
|
| + /* `ft_gray_raster.raster_new'; an anti-aliased bitmap can be generated */
|
| + /* with a call to `ft_gray_raster.raster_render'. */
|
| + /* */
|
| + /* See the comments and documentation in the file `ftimage.h' for more */
|
| + /* details on how the raster works. */
|
| + /* */
|
| + /*************************************************************************/
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* This is a new anti-aliasing scan-converter for FreeType 2. The */
|
| + /* algorithm used here is _very_ different from the one in the standard */
|
| + /* `ftraster' module. Actually, `ftgrays' computes the _exact_ */
|
| + /* coverage of the outline on each pixel cell. */
|
| + /* */
|
| + /* It is based on ideas that I initially found in Raph Levien's */
|
| + /* excellent LibArt graphics library (see http://www.levien.com/libart */
|
| + /* for more information, though the web pages do not tell anything */
|
| + /* about the renderer; you'll have to dive into the source code to */
|
| + /* understand how it works). */
|
| + /* */
|
| + /* Note, however, that this is a _very_ different implementation */
|
| + /* compared to Raph's. Coverage information is stored in a very */
|
| + /* different way, and I don't use sorted vector paths. Also, it doesn't */
|
| + /* use floating point values. */
|
| + /* */
|
| + /* This renderer has the following advantages: */
|
| + /* */
|
| + /* - It doesn't need an intermediate bitmap. Instead, one can supply a */
|
| + /* callback function that will be called by the renderer to draw gray */
|
| + /* spans on any target surface. You can thus do direct composition on */
|
| + /* any kind of bitmap, provided that you give the renderer the right */
|
| + /* callback. */
|
| + /* */
|
| + /* - A perfect anti-aliaser, i.e., it computes the _exact_ coverage on */
|
| + /* each pixel cell. */
|
| + /* */
|
| + /* - It performs a single pass on the outline (the `standard' FT2 */
|
| + /* renderer makes two passes). */
|
| + /* */
|
| + /* - It can easily be modified to render to _any_ number of gray levels */
|
| + /* cheaply. */
|
| + /* */
|
| + /* - For small (< 20) pixel sizes, it is faster than the standard */
|
| + /* renderer. */
|
| + /* */
|
| + /*************************************************************************/
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
|
| + /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
|
| + /* messages during execution. */
|
| + /* */
|
| +#undef FT_COMPONENT
|
| +#define FT_COMPONENT trace_smooth
|
| +
|
| +
|
| +#ifdef _STANDALONE_
|
| +
|
| +
|
| + /* The size in bytes of the render pool used by the scan-line converter */
|
| + /* to do all of its work. */
|
| +#define FT_RENDER_POOL_SIZE 16384L
|
| +
|
| +
|
| + /* 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 FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
|
| +#define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
|
| +
|
| +
|
| + /*
|
| + * Approximate sqrt(x*x+y*y) using the `alpha max plus beta min'
|
| + * algorithm. We use alpha = 1, beta = 3/8, giving us results with a
|
| + * largest error less than 7% compared to the exact value.
|
| + */
|
| +#define FT_HYPOT( x, y ) \
|
| + ( x = FT_ABS( x ), \
|
| + y = FT_ABS( y ), \
|
| + x > y ? x + ( 3 * y >> 3 ) \
|
| + : y + ( 3 * x >> 3 ) )
|
| +
|
| +
|
| + /* define this to dump debugging information */
|
| +/* #define FT_DEBUG_LEVEL_TRACE */
|
| +
|
| +
|
| +#ifdef FT_DEBUG_LEVEL_TRACE
|
| +#include <stdio.h>
|
| +#include <stdarg.h>
|
| +#endif
|
| +
|
| +#include <stddef.h>
|
| +#include <string.h>
|
| +#include <setjmp.h>
|
| +#include <limits.h>
|
| +#define FT_CHAR_BIT CHAR_BIT
|
| +#define FT_UINT_MAX UINT_MAX
|
| +#define FT_INT_MAX INT_MAX
|
| +#define FT_ULONG_MAX ULONG_MAX
|
| +
|
| +#define ft_memset memset
|
| +
|
| +#define ft_setjmp setjmp
|
| +#define ft_longjmp longjmp
|
| +#define ft_jmp_buf jmp_buf
|
| +
|
| +typedef ptrdiff_t FT_PtrDist;
|
| +
|
| +
|
| +#define ErrRaster_Invalid_Mode -2
|
| +#define ErrRaster_Invalid_Outline -1
|
| +#define ErrRaster_Invalid_Argument -3
|
| +#define ErrRaster_Memory_Overflow -4
|
| +
|
| +#define FT_BEGIN_HEADER
|
| +#define FT_END_HEADER
|
| +
|
| +#include "ftimage.h"
|
| +#include "ftgrays.h"
|
| +
|
| +
|
| + /* This macro is used to indicate that a function parameter is unused. */
|
| + /* Its purpose is simply to reduce compiler warnings. Note also that */
|
| + /* simply defining it as `(void)x' doesn't avoid warnings with certain */
|
| + /* ANSI compilers (e.g. LCC). */
|
| +#define FT_UNUSED( x ) (x) = (x)
|
| +
|
| +
|
| + /* we only use level 5 & 7 tracing messages; cf. ftdebug.h */
|
| +
|
| +#ifdef FT_DEBUG_LEVEL_TRACE
|
| +
|
| + void
|
| + FT_Message( const char* fmt,
|
| + ... )
|
| + {
|
| + va_list ap;
|
| +
|
| +
|
| + va_start( ap, fmt );
|
| + vfprintf( stderr, fmt, ap );
|
| + 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
|
| +#endif
|
| +#ifndef FT_TRACE7
|
| +#define FT_TRACE7( varformat ) FT_Message varformat
|
| +#endif
|
| +#ifndef FT_ERROR
|
| +#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 */
|
| +
|
| +
|
| +#define FT_DEFINE_OUTLINE_FUNCS( class_, \
|
| + move_to_, line_to_, \
|
| + conic_to_, cubic_to_, \
|
| + shift_, delta_ ) \
|
| + static const FT_Outline_Funcs class_ = \
|
| + { \
|
| + move_to_, \
|
| + line_to_, \
|
| + conic_to_, \
|
| + cubic_to_, \
|
| + shift_, \
|
| + delta_ \
|
| + };
|
| +
|
| +#define FT_DEFINE_RASTER_FUNCS( class_, glyph_format_, \
|
| + raster_new_, raster_reset_, \
|
| + raster_set_mode_, raster_render_, \
|
| + raster_done_ ) \
|
| + const FT_Raster_Funcs class_ = \
|
| + { \
|
| + glyph_format_, \
|
| + raster_new_, \
|
| + raster_reset_, \
|
| + raster_set_mode_, \
|
| + raster_render_, \
|
| + raster_done_ \
|
| + };
|
| +
|
| +
|
| +#else /* !_STANDALONE_ */
|
| +
|
| +
|
| +#include <ft2build.h>
|
| +#include "ftgrays.h"
|
| +#include FT_INTERNAL_OBJECTS_H
|
| +#include FT_INTERNAL_DEBUG_H
|
| +#include FT_OUTLINE_H
|
| +
|
| +#include "ftsmerrs.h"
|
| +
|
| +#include "ftspic.h"
|
| +
|
| +#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
|
| +
|
| +
|
| +#endif /* !_STANDALONE_ */
|
| +
|
| +
|
| +#ifndef FT_MEM_SET
|
| +#define FT_MEM_SET( d, s, c ) ft_memset( d, s, c )
|
| +#endif
|
| +
|
| +#ifndef FT_MEM_ZERO
|
| +#define FT_MEM_ZERO( dest, count ) FT_MEM_SET( dest, 0, count )
|
| +#endif
|
| +
|
| + /* as usual, for the speed hungry :-) */
|
| +
|
| +#undef RAS_ARG
|
| +#undef RAS_ARG_
|
| +#undef RAS_VAR
|
| +#undef RAS_VAR_
|
| +
|
| +#ifndef FT_STATIC_RASTER
|
| +
|
| +#define RAS_ARG gray_PWorker worker
|
| +#define RAS_ARG_ gray_PWorker worker,
|
| +
|
| +#define RAS_VAR worker
|
| +#define RAS_VAR_ worker,
|
| +
|
| +#else /* FT_STATIC_RASTER */
|
| +
|
| +#define RAS_ARG /* empty */
|
| +#define RAS_ARG_ /* empty */
|
| +#define RAS_VAR /* empty */
|
| +#define RAS_VAR_ /* empty */
|
| +
|
| +#endif /* FT_STATIC_RASTER */
|
| +
|
| +
|
| + /* must be at least 6 bits! */
|
| +#define PIXEL_BITS 8
|
| +
|
| +#undef FLOOR
|
| +#undef CEILING
|
| +#undef TRUNC
|
| +#undef SCALED
|
| +
|
| +#define ONE_PIXEL ( 1L << PIXEL_BITS )
|
| +#define TRUNC( x ) ( (TCoord)( (x) >> PIXEL_BITS ) )
|
| +#define SUBPIXELS( x ) ( (TPos)(x) << PIXEL_BITS )
|
| +#define FLOOR( x ) ( (x) & -ONE_PIXEL )
|
| +#define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL )
|
| +#define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL )
|
| +
|
| +#if PIXEL_BITS >= 6
|
| +#define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) )
|
| +#define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) )
|
| +#else
|
| +#define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) )
|
| +#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )
|
| +#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__ */
|
| +
|
| +
|
| + /* These macros speed up repetitive divisions by replacing them */
|
| + /* with multiplications and right shifts. */
|
| +#define FT_UDIVPREP( b ) \
|
| + long b ## _r = (long)( FT_ULONG_MAX >> PIXEL_BITS ) / ( b )
|
| +#define FT_UDIV( a, b ) \
|
| + ( ( (unsigned long)( a ) * (unsigned long)( b ## _r ) ) >> \
|
| + ( sizeof( long ) * FT_CHAR_BIT - PIXEL_BITS ) )
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* TYPE DEFINITIONS */
|
| + /* */
|
| +
|
| + /* don't change the following types to FT_Int or FT_Pos, since we might */
|
| + /* need to define them to "float" or "double" when experimenting with */
|
| + /* new algorithms */
|
| +
|
| + typedef long TCoord; /* integer scanline/pixel coordinate */
|
| + typedef long TPos; /* sub-pixel coordinate */
|
| +
|
| + /* determine the type used to store cell areas. This normally takes at */
|
| + /* least PIXEL_BITS*2 + 1 bits. On 16-bit systems, we need to use */
|
| + /* `long' instead of `int', otherwise bad things happen */
|
| +
|
| +#if PIXEL_BITS <= 7
|
| +
|
| + typedef int TArea;
|
| +
|
| +#else /* PIXEL_BITS >= 8 */
|
| +
|
| + /* approximately determine the size of integers using an ANSI-C header */
|
| +#if FT_UINT_MAX == 0xFFFFU
|
| + typedef long TArea;
|
| +#else
|
| + typedef int TArea;
|
| +#endif
|
| +
|
| +#endif /* PIXEL_BITS >= 8 */
|
| +
|
| +
|
| + /* maximum number of gray spans in a call to the span callback */
|
| +#define FT_MAX_GRAY_SPANS 32
|
| +
|
| +
|
| + typedef struct TCell_* PCell;
|
| +
|
| + typedef struct TCell_
|
| + {
|
| + TPos x; /* same with gray_TWorker.ex */
|
| + TCoord cover; /* same with gray_TWorker.cover */
|
| + TArea area;
|
| + PCell next;
|
| +
|
| + } 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;
|
| + TPos count_ex, count_ey;
|
| +
|
| + TArea area;
|
| + TCoord cover;
|
| + int invalid;
|
| +
|
| + PCell cells;
|
| + FT_PtrDist max_cells;
|
| + FT_PtrDist num_cells;
|
| +
|
| + TPos x, y;
|
| +
|
| + FT_Vector bez_stack[32 * 3 + 1];
|
| + int lev_stack[32];
|
| +
|
| + FT_Outline outline;
|
| + FT_Bitmap target;
|
| + FT_BBox clip_box;
|
| +
|
| + FT_Span gray_spans[FT_MAX_GRAY_SPANS];
|
| + int num_gray_spans;
|
| +
|
| + FT_Raster_Span_Func render_span;
|
| + void* render_span_data;
|
| + int span_y;
|
| +
|
| + int band_size;
|
| + int band_shoot;
|
| +
|
| + void* buffer;
|
| + long buffer_size;
|
| +
|
| + PCell* ycells;
|
| + TPos ycount;
|
| +
|
| + } gray_TWorker, *gray_PWorker;
|
| +
|
| +#if defined( _MSC_VER )
|
| +#pragma warning( pop )
|
| +#endif
|
| +
|
| +
|
| +#ifndef FT_STATIC_RASTER
|
| +#define ras (*worker)
|
| +#else
|
| + static gray_TWorker ras;
|
| +#endif
|
| +
|
| +
|
| + typedef struct gray_TRaster_
|
| + {
|
| + void* memory;
|
| +
|
| + } gray_TRaster, *gray_PRaster;
|
| +
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Initialize the cells table. */
|
| + /* */
|
| + static void
|
| + gray_init_cells( RAS_ARG_ void* buffer,
|
| + long byte_size )
|
| + {
|
| + ras.buffer = buffer;
|
| + ras.buffer_size = byte_size;
|
| +
|
| + ras.ycells = (PCell*) buffer;
|
| + ras.cells = NULL;
|
| + ras.max_cells = 0;
|
| + ras.num_cells = 0;
|
| + ras.area = 0;
|
| + ras.cover = 0;
|
| + ras.invalid = 1;
|
| + }
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Compute the outline bounding box. */
|
| + /* */
|
| + static void
|
| + gray_compute_cbox( RAS_ARG )
|
| + {
|
| + FT_Outline* outline = &ras.outline;
|
| + FT_Vector* vec = outline->points;
|
| + FT_Vector* limit = vec + outline->n_points;
|
| +
|
| +
|
| + if ( outline->n_points <= 0 )
|
| + {
|
| + ras.min_ex = ras.max_ex = 0;
|
| + ras.min_ey = ras.max_ey = 0;
|
| + return;
|
| + }
|
| +
|
| + ras.min_ex = ras.max_ex = vec->x;
|
| + ras.min_ey = ras.max_ey = vec->y;
|
| +
|
| + vec++;
|
| +
|
| + for ( ; vec < limit; vec++ )
|
| + {
|
| + TPos x = vec->x;
|
| + TPos y = vec->y;
|
| +
|
| +
|
| + if ( x < ras.min_ex ) ras.min_ex = x;
|
| + if ( x > ras.max_ex ) ras.max_ex = x;
|
| + if ( y < ras.min_ey ) ras.min_ey = y;
|
| + if ( y > ras.max_ey ) ras.max_ey = y;
|
| + }
|
| +
|
| + /* truncate the bounding box to integer pixels */
|
| + ras.min_ex = ras.min_ex >> 6;
|
| + ras.min_ey = ras.min_ey >> 6;
|
| + ras.max_ex = ( ras.max_ex + 63 ) >> 6;
|
| + ras.max_ey = ( ras.max_ey + 63 ) >> 6;
|
| + }
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Record the current cell in the table. */
|
| + /* */
|
| + static PCell
|
| + gray_find_cell( RAS_ARG )
|
| + {
|
| + PCell *pcell, cell;
|
| + TPos x = ras.ex;
|
| +
|
| +
|
| + if ( x > ras.count_ex )
|
| + x = ras.count_ex;
|
| +
|
| + pcell = &ras.ycells[ras.ey];
|
| + for (;;)
|
| + {
|
| + cell = *pcell;
|
| + if ( cell == NULL || cell->x > x )
|
| + break;
|
| +
|
| + if ( cell->x == x )
|
| + goto Exit;
|
| +
|
| + pcell = &cell->next;
|
| + }
|
| +
|
| + if ( ras.num_cells >= ras.max_cells )
|
| + ft_longjmp( ras.jump_buffer, 1 );
|
| +
|
| + cell = ras.cells + ras.num_cells++;
|
| + cell->x = x;
|
| + cell->area = 0;
|
| + cell->cover = 0;
|
| +
|
| + cell->next = *pcell;
|
| + *pcell = cell;
|
| +
|
| + Exit:
|
| + return cell;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_record_cell( RAS_ARG )
|
| + {
|
| + if ( ras.area | ras.cover )
|
| + {
|
| + PCell cell = gray_find_cell( RAS_VAR );
|
| +
|
| +
|
| + cell->area += ras.area;
|
| + cell->cover += ras.cover;
|
| + }
|
| + }
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Set the current cell to a new position. */
|
| + /* */
|
| + static void
|
| + gray_set_cell( RAS_ARG_ TCoord ex,
|
| + TCoord ey )
|
| + {
|
| + /* 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: */
|
| + /* */
|
| + /* . the new vertical position must be within min_ey..max_ey-1. */
|
| + /* . the new horizontal position must be strictly less than max_ex */
|
| + /* */
|
| + /* Note that if a cell is to the left of the clipping region, it is */
|
| + /* actually set to the (min_ex-1) horizontal position. */
|
| +
|
| + /* All cells that are on the left of the clipping region go to the */
|
| + /* min_ex - 1 horizontal position. */
|
| + ey -= ras.min_ey;
|
| +
|
| + if ( ex > ras.max_ex )
|
| + ex = ras.max_ex;
|
| +
|
| + ex -= ras.min_ex;
|
| + if ( ex < 0 )
|
| + ex = -1;
|
| +
|
| + /* are we moving to a different cell ? */
|
| + if ( ex != ras.ex || ey != ras.ey )
|
| + {
|
| + /* record the current one if it is valid */
|
| + if ( !ras.invalid )
|
| + gray_record_cell( RAS_VAR );
|
| +
|
| + ras.area = 0;
|
| + ras.cover = 0;
|
| + ras.ex = ex;
|
| + ras.ey = ey;
|
| + }
|
| +
|
| + ras.invalid = ( (unsigned int)ey >= (unsigned int)ras.count_ey ||
|
| + ex >= ras.count_ex );
|
| + }
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Start a new contour at a given cell. */
|
| + /* */
|
| + static void
|
| + gray_start_cell( RAS_ARG_ TCoord ex,
|
| + TCoord ey )
|
| + {
|
| + if ( ex > ras.max_ex )
|
| + ex = (TCoord)( ras.max_ex );
|
| +
|
| + if ( ex < ras.min_ex )
|
| + ex = (TCoord)( ras.min_ex - 1 );
|
| +
|
| + ras.area = 0;
|
| + ras.cover = 0;
|
| + ras.ex = ex - ras.min_ex;
|
| + ras.ey = ey - ras.min_ey;
|
| + ras.invalid = 0;
|
| +
|
| + gray_set_cell( RAS_VAR_ ex, ey );
|
| + }
|
| +
|
| +#if 0
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* 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;
|
| + }
|
| +
|
| + 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 );
|
| + FT_DIV_MOD( TCoord, p, dx, lift, rem );
|
| +
|
| + mod -= (int)dx;
|
| +
|
| + do
|
| + {
|
| + 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 );
|
| + } while ( ex1 != ex2 );
|
| + }
|
| +
|
| + delta = y2 - y1;
|
| + ras.area += (TArea)(( fx2 + ONE_PIXEL - first ) * delta);
|
| + ras.cover += delta;
|
| + }
|
| +
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Render a given line as a series of scanlines. */
|
| + /* */
|
| + 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;
|
| +
|
| +
|
| + ey1 = TRUNC( ras.y );
|
| + ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */
|
| + fy1 = (TCoord)( ras.y - SUBPIXELS( ey1 ) );
|
| + fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );
|
| +
|
| + dx = to_x - ras.x;
|
| + dy = to_y - ras.y;
|
| +
|
| + /* perform vertical clipping */
|
| + if ( ( ey1 >= ras.max_ey && ey2 >= ras.max_ey ) ||
|
| + ( ey1 < ras.min_ey && ey2 < ras.min_ey ) )
|
| + goto End;
|
| +
|
| + /* everything is on a single scanline */
|
| + if ( ey1 == ey2 )
|
| + {
|
| + 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;
|
| + }
|
| +
|
| + 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;
|
| + FT_DIV_MOD( int, p, dy, lift, rem );
|
| + mod -= (int)dy;
|
| +
|
| + do
|
| + {
|
| + delta = lift;
|
| + mod += rem;
|
| + if ( mod >= 0 )
|
| + {
|
| + mod -= (int)dy;
|
| + delta++;
|
| + }
|
| +
|
| + 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 );
|
| + } while ( ey1 != ey2 );
|
| + }
|
| +
|
| + gray_render_scanline( RAS_VAR_ ey1, x,
|
| + (TCoord)( ONE_PIXEL - first ), to_x,
|
| + fy2 );
|
| +
|
| + End:
|
| + ras.x = to_x;
|
| + ras.y = to_y;
|
| + }
|
| +
|
| +#else
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* Render a straight line across multiple cells in any direction. */
|
| + /* */
|
| + static void
|
| + gray_render_line( RAS_ARG_ TPos to_x,
|
| + TPos to_y )
|
| + {
|
| + TPos dx, dy, fx1, fy1, fx2, fy2;
|
| + TCoord ex1, ex2, ey1, 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;
|
| +
|
| + 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 */
|
| + {
|
| + ex1 = ex2;
|
| + gray_set_cell( RAS_VAR_ ex1, ey1 );
|
| + }
|
| + else if ( dx == 0 )
|
| + {
|
| + if ( dy > 0 ) /* vertical line up */
|
| + do
|
| + {
|
| + 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;
|
| + FT_UDIVPREP( dx );
|
| + 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)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)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)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)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--;
|
| + }
|
| +
|
| + gray_set_cell( RAS_VAR_ ex1, ey1 );
|
| + } while ( ex1 != ex2 || ey1 != ey2 );
|
| + }
|
| +
|
| + 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;
|
| + }
|
| +
|
| +#endif
|
| +
|
| + static void
|
| + gray_split_conic( FT_Vector* base )
|
| + {
|
| + TPos a, b;
|
| +
|
| +
|
| + base[4].x = base[2].x;
|
| + b = base[1].x;
|
| + a = base[3].x = ( base[2].x + b ) / 2;
|
| + b = base[1].x = ( base[0].x + b ) / 2;
|
| + base[2].x = ( a + b ) / 2;
|
| +
|
| + base[4].y = base[2].y;
|
| + b = base[1].y;
|
| + a = base[3].y = ( base[2].y + b ) / 2;
|
| + b = base[1].y = ( base[0].y + b ) / 2;
|
| + base[2].y = ( a + b ) / 2;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_render_conic( RAS_ARG_ const FT_Vector* control,
|
| + const FT_Vector* to )
|
| + {
|
| + TPos dx, dy;
|
| + TPos min, max, y;
|
| + int top, level;
|
| + int* levels;
|
| + FT_Vector* arc;
|
| +
|
| +
|
| + levels = ras.lev_stack;
|
| +
|
| + arc = ras.bez_stack;
|
| + arc[0].x = UPSCALE( to->x );
|
| + arc[0].y = UPSCALE( to->y );
|
| + arc[1].x = UPSCALE( control->x );
|
| + arc[1].y = UPSCALE( control->y );
|
| + arc[2].x = ras.x;
|
| + arc[2].y = ras.y;
|
| + top = 0;
|
| +
|
| + dx = FT_ABS( arc[2].x + arc[0].x - 2 * arc[1].x );
|
| + dy = FT_ABS( arc[2].y + arc[0].y - 2 * arc[1].y );
|
| + if ( dx < dy )
|
| + dx = dy;
|
| +
|
| + if ( dx < ONE_PIXEL / 4 )
|
| + goto Draw;
|
| +
|
| + /* short-cut the arc that crosses the current band */
|
| + min = max = arc[0].y;
|
| +
|
| + y = arc[1].y;
|
| + if ( y < min ) min = y;
|
| + if ( y > max ) max = y;
|
| +
|
| + y = arc[2].y;
|
| + if ( y < min ) min = y;
|
| + if ( y > max ) max = y;
|
| +
|
| + if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )
|
| + goto Draw;
|
| +
|
| + level = 0;
|
| + do
|
| + {
|
| + dx >>= 2;
|
| + level++;
|
| + } while ( dx > ONE_PIXEL / 4 );
|
| +
|
| + levels[0] = level;
|
| +
|
| + do
|
| + {
|
| + level = levels[top];
|
| + if ( level > 0 )
|
| + {
|
| + gray_split_conic( arc );
|
| + arc += 2;
|
| + top++;
|
| + levels[top] = levels[top - 1] = level - 1;
|
| + continue;
|
| + }
|
| +
|
| + Draw:
|
| + gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
|
| + top--;
|
| + arc -= 2;
|
| +
|
| + } while ( top >= 0 );
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_split_cubic( FT_Vector* base )
|
| + {
|
| + TPos a, b, c, d;
|
| +
|
| +
|
| + base[6].x = base[3].x;
|
| + c = base[1].x;
|
| + d = base[2].x;
|
| + base[1].x = a = ( base[0].x + c ) / 2;
|
| + base[5].x = b = ( base[3].x + d ) / 2;
|
| + c = ( c + d ) / 2;
|
| + base[2].x = a = ( a + c ) / 2;
|
| + base[4].x = b = ( b + c ) / 2;
|
| + base[3].x = ( a + b ) / 2;
|
| +
|
| + base[6].y = base[3].y;
|
| + c = base[1].y;
|
| + d = base[2].y;
|
| + base[1].y = a = ( base[0].y + c ) / 2;
|
| + base[5].y = b = ( base[3].y + d ) / 2;
|
| + c = ( c + d ) / 2;
|
| + base[2].y = a = ( a + c ) / 2;
|
| + base[4].y = b = ( b + c ) / 2;
|
| + base[3].y = ( a + b ) / 2;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_render_cubic( RAS_ARG_ const FT_Vector* control1,
|
| + const FT_Vector* control2,
|
| + const FT_Vector* to )
|
| + {
|
| + FT_Vector* arc;
|
| + TPos min, max, y;
|
| +
|
| +
|
| + arc = ras.bez_stack;
|
| + arc[0].x = UPSCALE( to->x );
|
| + arc[0].y = UPSCALE( to->y );
|
| + arc[1].x = UPSCALE( control2->x );
|
| + arc[1].y = UPSCALE( control2->y );
|
| + arc[2].x = UPSCALE( control1->x );
|
| + arc[2].y = UPSCALE( control1->y );
|
| + arc[3].x = ras.x;
|
| + arc[3].y = ras.y;
|
| +
|
| + /* Short-cut the arc that crosses the current band. */
|
| + min = max = arc[0].y;
|
| +
|
| + y = arc[1].y;
|
| + if ( y < min )
|
| + min = y;
|
| + if ( y > max )
|
| + max = y;
|
| +
|
| + y = arc[2].y;
|
| + if ( y < min )
|
| + min = y;
|
| + if ( y > max )
|
| + max = y;
|
| +
|
| + y = arc[3].y;
|
| + if ( y < min )
|
| + min = y;
|
| + if ( y > max )
|
| + max = y;
|
| +
|
| + if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )
|
| + goto Draw;
|
| +
|
| + for (;;)
|
| + {
|
| + /* Decide whether to split or draw. See `Rapid Termination */
|
| + /* Evaluation for Recursive Subdivision of Bezier Curves' by Thomas */
|
| + /* F. Hain, at */
|
| + /* http://www.cis.southalabama.edu/~hain/general/Publications/Bezier/Camera-ready%20CISST02%202.pdf */
|
| +
|
| + {
|
| + TPos dx, dy, dx_, dy_;
|
| + TPos dx1, dy1, dx2, dy2;
|
| + TPos L, s, s_limit;
|
| +
|
| +
|
| + /* dx and dy are x and y components of the P0-P3 chord vector. */
|
| + 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 )
|
| + goto Split;
|
| +
|
| + /* Max deviation may be as much as (s/L) * 3/4 (if Hain's v = 1). */
|
| + s_limit = L * (TPos)( ONE_PIXEL / 6 );
|
| +
|
| + /* s is L * the perpendicular distance from P1 to the line P0-P3. */
|
| + dx1 = arc[1].x - arc[0].x;
|
| + dy1 = arc[1].y - arc[0].y;
|
| + s = FT_ABS( dy * dx1 - dx * dy1 );
|
| +
|
| + if ( s > s_limit )
|
| + goto Split;
|
| +
|
| + /* s is L * the perpendicular distance from P2 to the line P0-P3. */
|
| + dx2 = arc[2].x - arc[0].x;
|
| + dy2 = arc[2].y - arc[0].y;
|
| + s = FT_ABS( dy * dx2 - dx * dy2 );
|
| +
|
| + if ( s > s_limit )
|
| + goto Split;
|
| +
|
| + /* 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. */
|
| + goto Draw;
|
| + }
|
| +
|
| + Split:
|
| + gray_split_cubic( arc );
|
| + arc += 3;
|
| + continue;
|
| +
|
| + Draw:
|
| + gray_render_line( RAS_VAR_ arc[0].x, arc[0].y );
|
| +
|
| + if ( arc == ras.bez_stack )
|
| + return;
|
| +
|
| + arc -= 3;
|
| + }
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_move_to( const FT_Vector* to,
|
| + gray_PWorker worker )
|
| + {
|
| + TPos x, y;
|
| +
|
| +
|
| + /* record current cell, if any */
|
| + if ( !ras.invalid )
|
| + gray_record_cell( RAS_VAR );
|
| +
|
| + /* start to a new position */
|
| + x = UPSCALE( to->x );
|
| + y = UPSCALE( to->y );
|
| +
|
| + gray_start_cell( RAS_VAR_ TRUNC( x ), TRUNC( y ) );
|
| +
|
| + worker->x = x;
|
| + worker->y = y;
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_line_to( const FT_Vector* to,
|
| + gray_PWorker worker )
|
| + {
|
| + gray_render_line( RAS_VAR_ UPSCALE( to->x ), UPSCALE( to->y ) );
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_conic_to( const FT_Vector* control,
|
| + const FT_Vector* to,
|
| + gray_PWorker worker )
|
| + {
|
| + gray_render_conic( RAS_VAR_ control, to );
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_cubic_to( const FT_Vector* control1,
|
| + const FT_Vector* control2,
|
| + const FT_Vector* to,
|
| + gray_PWorker worker )
|
| + {
|
| + gray_render_cubic( RAS_VAR_ control1, control2, to );
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_render_span( int y,
|
| + int count,
|
| + const FT_Span* spans,
|
| + gray_PWorker worker )
|
| + {
|
| + unsigned char* p;
|
| + FT_Bitmap* map = &worker->target;
|
| +
|
| +
|
| + /* first of all, compute the scanline offset */
|
| + p = (unsigned char*)map->buffer - y * map->pitch;
|
| + if ( map->pitch >= 0 )
|
| + p += ( map->rows - 1 ) * (unsigned int)map->pitch;
|
| +
|
| + for ( ; count > 0; count--, spans++ )
|
| + {
|
| + unsigned char coverage = spans->coverage;
|
| +
|
| +
|
| + if ( coverage )
|
| + {
|
| + /* For small-spans it is faster to do it by 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:
|
| + ;
|
| + }
|
| + }
|
| + }
|
| + }
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_hline( RAS_ARG_ TCoord x,
|
| + TCoord y,
|
| + TPos area,
|
| + TCoord acount )
|
| + {
|
| + int coverage;
|
| +
|
| +
|
| + /* compute the coverage line's coverage, depending on the */
|
| + /* outline fill rule */
|
| + /* */
|
| + /* the coverage percentage is area/(PIXEL_BITS*PIXEL_BITS*2) */
|
| + /* */
|
| + coverage = (int)( area >> ( PIXEL_BITS * 2 + 1 - 8 ) );
|
| + /* use range 0..256 */
|
| + if ( coverage < 0 )
|
| + coverage = -coverage;
|
| +
|
| + if ( ras.outline.flags & FT_OUTLINE_EVEN_ODD_FILL )
|
| + {
|
| + coverage &= 511;
|
| +
|
| + if ( coverage > 256 )
|
| + coverage = 512 - coverage;
|
| + else if ( coverage == 256 )
|
| + coverage = 255;
|
| + }
|
| + else
|
| + {
|
| + /* normal non-zero winding rule */
|
| + if ( coverage >= 256 )
|
| + coverage = 255;
|
| + }
|
| +
|
| + y += (TCoord)ras.min_ey;
|
| + x += (TCoord)ras.min_ex;
|
| +
|
| + /* FT_Span.x is a 16-bit short, so limit our coordinates appropriately */
|
| + if ( x >= 32767 )
|
| + x = 32767;
|
| +
|
| + /* FT_Span.y is an integer, so limit our coordinates appropriately */
|
| + if ( y >= FT_INT_MAX )
|
| + y = FT_INT_MAX;
|
| +
|
| + 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;
|
| + if ( count > 0 &&
|
| + ras.span_y == y &&
|
| + (int)span->x + span->len == (int)x &&
|
| + span->coverage == coverage )
|
| + {
|
| + span->len = (unsigned short)( span->len + acount );
|
| + return;
|
| + }
|
| +
|
| + if ( ras.span_y != y || count >= FT_MAX_GRAY_SPANS )
|
| + {
|
| + if ( ras.render_span && count > 0 )
|
| + ras.render_span( ras.span_y, count, ras.gray_spans,
|
| + ras.render_span_data );
|
| +
|
| +#ifdef FT_DEBUG_LEVEL_TRACE
|
| +
|
| + if ( count > 0 )
|
| + {
|
| + int n;
|
| +
|
| +
|
| + FT_TRACE7(( "y = %3d ", ras.span_y ));
|
| + span = ras.gray_spans;
|
| + for ( n = 0; n < count; n++, span++ )
|
| + FT_TRACE7(( "[%d..%d]:%02x ",
|
| + span->x, span->x + span->len - 1, span->coverage ));
|
| + FT_TRACE7(( "\n" ));
|
| + }
|
| +
|
| +#endif /* FT_DEBUG_LEVEL_TRACE */
|
| +
|
| + ras.num_gray_spans = 0;
|
| + ras.span_y = (int)y;
|
| +
|
| + span = ras.gray_spans;
|
| + }
|
| + else
|
| + span++;
|
| +
|
| + /* add a gray span to the current list */
|
| + span->x = (short)x;
|
| + span->len = (unsigned short)acount;
|
| + span->coverage = (unsigned char)coverage;
|
| +
|
| + ras.num_gray_spans++;
|
| + }
|
| + }
|
| +
|
| +
|
| +#ifdef FT_DEBUG_LEVEL_TRACE
|
| +
|
| + /* to be called while in the debugger -- */
|
| + /* this function causes a compiler warning since it is unused otherwise */
|
| + static void
|
| + gray_dump_cells( RAS_ARG )
|
| + {
|
| + int yindex;
|
| +
|
| +
|
| + for ( yindex = 0; yindex < ras.ycount; yindex++ )
|
| + {
|
| + PCell cell;
|
| +
|
| +
|
| + printf( "%3d:", yindex );
|
| +
|
| + for ( cell = ras.ycells[yindex]; cell != NULL; cell = cell->next )
|
| + printf( " (%3ld, c:%4ld, a:%6d)", cell->x, cell->cover, cell->area );
|
| + printf( "\n" );
|
| + }
|
| + }
|
| +
|
| +#endif /* FT_DEBUG_LEVEL_TRACE */
|
| +
|
| +
|
| + static void
|
| + gray_sweep( RAS_ARG_ const FT_Bitmap* target )
|
| + {
|
| + int yindex;
|
| +
|
| + FT_UNUSED( target );
|
| +
|
| +
|
| + if ( ras.num_cells == 0 )
|
| + return;
|
| +
|
| + ras.num_gray_spans = 0;
|
| +
|
| + FT_TRACE7(( "gray_sweep: start\n" ));
|
| +
|
| + for ( yindex = 0; yindex < ras.ycount; yindex++ )
|
| + {
|
| + PCell cell = ras.ycells[yindex];
|
| + TCoord cover = 0;
|
| + TCoord x = 0;
|
| +
|
| +
|
| + for ( ; cell != NULL; cell = cell->next )
|
| + {
|
| + TPos area;
|
| +
|
| +
|
| + if ( cell->x > x && cover != 0 )
|
| + gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
|
| + cell->x - x );
|
| +
|
| + cover += cell->cover;
|
| + area = cover * ( ONE_PIXEL * 2 ) - cell->area;
|
| +
|
| + if ( area != 0 && cell->x >= 0 )
|
| + gray_hline( RAS_VAR_ cell->x, yindex, area, 1 );
|
| +
|
| + x = cell->x + 1;
|
| + }
|
| +
|
| + if ( cover != 0 )
|
| + gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
|
| + ras.count_ex - x );
|
| + }
|
| +
|
| + if ( ras.render_span && ras.num_gray_spans > 0 )
|
| + 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 */
|
| +
|
| + }
|
| +
|
| +
|
| +#ifdef _STANDALONE_
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* The following function should only compile in stand-alone mode, */
|
| + /* i.e., when building this component without the rest of FreeType. */
|
| + /* */
|
| + /*************************************************************************/
|
| +
|
| + /*************************************************************************/
|
| + /* */
|
| + /* <Function> */
|
| + /* FT_Outline_Decompose */
|
| + /* */
|
| + /* <Description> */
|
| + /* Walk over an outline's structure to decompose it into individual */
|
| + /* segments and Bézier arcs. This function is also able to emit */
|
| + /* `move to' and `close to' operations to indicate the start and end */
|
| + /* of new contours in the outline. */
|
| + /* */
|
| + /* <Input> */
|
| + /* outline :: A pointer to the source target. */
|
| + /* */
|
| + /* func_interface :: A table of `emitters', i.e., function pointers */
|
| + /* called during decomposition to indicate path */
|
| + /* operations. */
|
| + /* */
|
| + /* <InOut> */
|
| + /* user :: A typeless pointer which is passed to each */
|
| + /* emitter during the decomposition. It can be */
|
| + /* used to store the state during the */
|
| + /* decomposition. */
|
| + /* */
|
| + /* <Return> */
|
| + /* Error code. 0 means success. */
|
| + /* */
|
| + static int
|
| + FT_Outline_Decompose( const FT_Outline* outline,
|
| + const FT_Outline_Funcs* func_interface,
|
| + void* user )
|
| + {
|
| +#undef SCALED
|
| +#define SCALED( x ) ( ( (x) << shift ) - delta )
|
| +
|
| + FT_Vector v_last;
|
| + FT_Vector v_control;
|
| + FT_Vector v_start;
|
| +
|
| + FT_Vector* point;
|
| + FT_Vector* limit;
|
| + char* tags;
|
| +
|
| + int error;
|
| +
|
| + int n; /* index of contour in outline */
|
| + int first; /* index of first point in contour */
|
| + char tag; /* current point's state */
|
| +
|
| + int shift;
|
| + TPos delta;
|
| +
|
| +
|
| + if ( !outline )
|
| + return FT_THROW( Invalid_Outline );
|
| +
|
| + if ( !func_interface )
|
| + return FT_THROW( Invalid_Argument );
|
| +
|
| + shift = func_interface->shift;
|
| + delta = func_interface->delta;
|
| + first = 0;
|
| +
|
| + for ( n = 0; n < outline->n_contours; n++ )
|
| + {
|
| + int last; /* index of last point in contour */
|
| +
|
| +
|
| + FT_TRACE5(( "FT_Outline_Decompose: Outline %d\n", n ));
|
| +
|
| + last = outline->contours[n];
|
| + if ( last < 0 )
|
| + goto Invalid_Outline;
|
| + limit = outline->points + last;
|
| +
|
| + v_start = outline->points[first];
|
| + v_start.x = SCALED( v_start.x );
|
| + v_start.y = SCALED( v_start.y );
|
| +
|
| + v_last = outline->points[last];
|
| + v_last.x = SCALED( v_last.x );
|
| + v_last.y = SCALED( v_last.y );
|
| +
|
| + v_control = v_start;
|
| +
|
| + point = outline->points + first;
|
| + tags = outline->tags + first;
|
| + tag = FT_CURVE_TAG( tags[0] );
|
| +
|
| + /* A contour cannot start with a cubic control point! */
|
| + if ( tag == FT_CURVE_TAG_CUBIC )
|
| + goto Invalid_Outline;
|
| +
|
| + /* check first point to determine origin */
|
| + if ( tag == FT_CURVE_TAG_CONIC )
|
| + {
|
| + /* first point is conic control. Yes, this happens. */
|
| + if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
|
| + {
|
| + /* start at last point if it is on the curve */
|
| + v_start = v_last;
|
| + limit--;
|
| + }
|
| + else
|
| + {
|
| + /* if both first and last points are conic, */
|
| + /* start at their middle and record its position */
|
| + /* for closure */
|
| + v_start.x = ( v_start.x + v_last.x ) / 2;
|
| + v_start.y = ( v_start.y + v_last.y ) / 2;
|
| +
|
| + v_last = v_start;
|
| + }
|
| + point--;
|
| + tags--;
|
| + }
|
| +
|
| + FT_TRACE5(( " move to (%.2f, %.2f)\n",
|
| + v_start.x / 64.0, v_start.y / 64.0 ));
|
| + error = func_interface->move_to( &v_start, user );
|
| + if ( error )
|
| + goto Exit;
|
| +
|
| + while ( point < limit )
|
| + {
|
| + point++;
|
| + tags++;
|
| +
|
| + tag = FT_CURVE_TAG( tags[0] );
|
| + switch ( tag )
|
| + {
|
| + case FT_CURVE_TAG_ON: /* emit a single line_to */
|
| + {
|
| + FT_Vector vec;
|
| +
|
| +
|
| + vec.x = SCALED( point->x );
|
| + vec.y = SCALED( point->y );
|
| +
|
| + FT_TRACE5(( " line to (%.2f, %.2f)\n",
|
| + vec.x / 64.0, vec.y / 64.0 ));
|
| + error = func_interface->line_to( &vec, user );
|
| + if ( error )
|
| + goto Exit;
|
| + continue;
|
| + }
|
| +
|
| + case FT_CURVE_TAG_CONIC: /* consume conic arcs */
|
| + v_control.x = SCALED( point->x );
|
| + v_control.y = SCALED( point->y );
|
| +
|
| + Do_Conic:
|
| + if ( point < limit )
|
| + {
|
| + FT_Vector vec;
|
| + FT_Vector v_middle;
|
| +
|
| +
|
| + point++;
|
| + tags++;
|
| + tag = FT_CURVE_TAG( tags[0] );
|
| +
|
| + vec.x = SCALED( point->x );
|
| + vec.y = SCALED( point->y );
|
| +
|
| + if ( tag == FT_CURVE_TAG_ON )
|
| + {
|
| + FT_TRACE5(( " conic to (%.2f, %.2f)"
|
| + " with control (%.2f, %.2f)\n",
|
| + vec.x / 64.0, vec.y / 64.0,
|
| + v_control.x / 64.0, v_control.y / 64.0 ));
|
| + error = func_interface->conic_to( &v_control, &vec, user );
|
| + if ( error )
|
| + goto Exit;
|
| + continue;
|
| + }
|
| +
|
| + if ( tag != FT_CURVE_TAG_CONIC )
|
| + goto Invalid_Outline;
|
| +
|
| + v_middle.x = ( v_control.x + vec.x ) / 2;
|
| + v_middle.y = ( v_control.y + vec.y ) / 2;
|
| +
|
| + FT_TRACE5(( " conic to (%.2f, %.2f)"
|
| + " with control (%.2f, %.2f)\n",
|
| + v_middle.x / 64.0, v_middle.y / 64.0,
|
| + v_control.x / 64.0, v_control.y / 64.0 ));
|
| + error = func_interface->conic_to( &v_control, &v_middle, user );
|
| + if ( error )
|
| + goto Exit;
|
| +
|
| + v_control = vec;
|
| + goto Do_Conic;
|
| + }
|
| +
|
| + FT_TRACE5(( " conic to (%.2f, %.2f)"
|
| + " with control (%.2f, %.2f)\n",
|
| + v_start.x / 64.0, v_start.y / 64.0,
|
| + v_control.x / 64.0, v_control.y / 64.0 ));
|
| + error = func_interface->conic_to( &v_control, &v_start, user );
|
| + goto Close;
|
| +
|
| + default: /* FT_CURVE_TAG_CUBIC */
|
| + {
|
| + FT_Vector vec1, vec2;
|
| +
|
| +
|
| + if ( point + 1 > limit ||
|
| + FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
|
| + goto Invalid_Outline;
|
| +
|
| + point += 2;
|
| + tags += 2;
|
| +
|
| + vec1.x = SCALED( point[-2].x );
|
| + vec1.y = SCALED( point[-2].y );
|
| +
|
| + vec2.x = SCALED( point[-1].x );
|
| + vec2.y = SCALED( point[-1].y );
|
| +
|
| + if ( point <= limit )
|
| + {
|
| + FT_Vector vec;
|
| +
|
| +
|
| + vec.x = SCALED( point->x );
|
| + vec.y = SCALED( point->y );
|
| +
|
| + FT_TRACE5(( " cubic to (%.2f, %.2f)"
|
| + " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
|
| + vec.x / 64.0, vec.y / 64.0,
|
| + vec1.x / 64.0, vec1.y / 64.0,
|
| + vec2.x / 64.0, vec2.y / 64.0 ));
|
| + error = func_interface->cubic_to( &vec1, &vec2, &vec, user );
|
| + if ( error )
|
| + goto Exit;
|
| + continue;
|
| + }
|
| +
|
| + FT_TRACE5(( " cubic to (%.2f, %.2f)"
|
| + " with controls (%.2f, %.2f) and (%.2f, %.2f)\n",
|
| + v_start.x / 64.0, v_start.y / 64.0,
|
| + vec1.x / 64.0, vec1.y / 64.0,
|
| + vec2.x / 64.0, vec2.y / 64.0 ));
|
| + error = func_interface->cubic_to( &vec1, &vec2, &v_start, user );
|
| + goto Close;
|
| + }
|
| + }
|
| + }
|
| +
|
| + /* close the contour with a line segment */
|
| + FT_TRACE5(( " line to (%.2f, %.2f)\n",
|
| + v_start.x / 64.0, v_start.y / 64.0 ));
|
| + error = func_interface->line_to( &v_start, user );
|
| +
|
| + Close:
|
| + if ( error )
|
| + goto Exit;
|
| +
|
| + first = last + 1;
|
| + }
|
| +
|
| + FT_TRACE5(( "FT_Outline_Decompose: Done\n", n ));
|
| + return 0;
|
| +
|
| + Exit:
|
| + FT_TRACE5(( "FT_Outline_Decompose: Error %d\n", error ));
|
| + return error;
|
| +
|
| + Invalid_Outline:
|
| + return FT_THROW( Invalid_Outline );
|
| + }
|
| +
|
| +#endif /* _STANDALONE_ */
|
| +
|
| +
|
| + typedef struct gray_TBand_
|
| + {
|
| + TPos min, max;
|
| +
|
| + } gray_TBand;
|
| +
|
| +
|
| + FT_DEFINE_OUTLINE_FUNCS(
|
| + func_interface,
|
| +
|
| + (FT_Outline_MoveTo_Func) gray_move_to,
|
| + (FT_Outline_LineTo_Func) gray_line_to,
|
| + (FT_Outline_ConicTo_Func)gray_conic_to,
|
| + (FT_Outline_CubicTo_Func)gray_cubic_to,
|
| + 0,
|
| + 0 )
|
| +
|
| +
|
| + static int
|
| + gray_convert_glyph_inner( RAS_ARG )
|
| + {
|
| +
|
| + volatile int error = 0;
|
| +
|
| +#ifdef FT_CONFIG_OPTION_PIC
|
| + FT_Outline_Funcs func_interface;
|
| + Init_Class_func_interface(&func_interface);
|
| +#endif
|
| +
|
| + if ( ft_setjmp( ras.jump_buffer ) == 0 )
|
| + {
|
| + error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );
|
| + if ( !ras.invalid )
|
| + gray_record_cell( RAS_VAR );
|
| + }
|
| + else
|
| + error = FT_THROW( Memory_Overflow );
|
| +
|
| + return error;
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_convert_glyph( RAS_ARG )
|
| + {
|
| + gray_TBand bands[40];
|
| + gray_TBand* volatile band;
|
| + int volatile n, num_bands;
|
| + TPos volatile min, max, max_y;
|
| + FT_BBox* clip;
|
| +
|
| +
|
| + /* Set up state in the raster object */
|
| + gray_compute_cbox( RAS_VAR );
|
| +
|
| + /* clip to target bitmap, exit if nothing to do */
|
| + clip = &ras.clip_box;
|
| +
|
| + if ( ras.max_ex <= clip->xMin || ras.min_ex >= clip->xMax ||
|
| + ras.max_ey <= clip->yMin || ras.min_ey >= clip->yMax )
|
| + return 0;
|
| +
|
| + if ( ras.min_ex < clip->xMin ) ras.min_ex = clip->xMin;
|
| + if ( ras.min_ey < clip->yMin ) ras.min_ey = clip->yMin;
|
| +
|
| + 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;
|
| +
|
| + /* set up vertical bands */
|
| + num_bands = (int)( ( ras.max_ey - ras.min_ey ) / ras.band_size );
|
| + if ( num_bands == 0 )
|
| + num_bands = 1;
|
| + if ( num_bands >= 39 )
|
| + num_bands = 39;
|
| +
|
| + ras.band_shoot = 0;
|
| +
|
| + min = ras.min_ey;
|
| + max_y = ras.max_ey;
|
| +
|
| + for ( n = 0; n < num_bands; n++, min = max )
|
| + {
|
| + max = min + ras.band_size;
|
| + if ( n == num_bands - 1 || max > max_y )
|
| + max = max_y;
|
| +
|
| + bands[0].min = min;
|
| + bands[0].max = max;
|
| + band = bands;
|
| +
|
| + do
|
| + {
|
| + TPos bottom, top, middle;
|
| + int error;
|
| +
|
| + {
|
| + PCell cells_max;
|
| + int yindex;
|
| + long cell_start, cell_end, cell_mod;
|
| +
|
| +
|
| + ras.ycells = (PCell*)ras.buffer;
|
| + ras.ycount = band->max - band->min;
|
| +
|
| + cell_start = (long)sizeof ( PCell ) * ras.ycount;
|
| + cell_mod = cell_start % (long)sizeof ( TCell );
|
| + if ( cell_mod > 0 )
|
| + cell_start += (long)sizeof ( TCell ) - cell_mod;
|
| +
|
| + cell_end = ras.buffer_size;
|
| + cell_end -= cell_end % (long)sizeof ( TCell );
|
| +
|
| + cells_max = (PCell)( (char*)ras.buffer + cell_end );
|
| + ras.cells = (PCell)( (char*)ras.buffer + cell_start );
|
| + if ( ras.cells >= cells_max )
|
| + goto ReduceBands;
|
| +
|
| + ras.max_cells = cells_max - ras.cells;
|
| + if ( ras.max_cells < 2 )
|
| + goto ReduceBands;
|
| +
|
| + for ( yindex = 0; yindex < ras.ycount; yindex++ )
|
| + ras.ycells[yindex] = NULL;
|
| + }
|
| +
|
| + ras.num_cells = 0;
|
| + ras.invalid = 1;
|
| + ras.min_ey = band->min;
|
| + ras.max_ey = band->max;
|
| + ras.count_ey = band->max - band->min;
|
| +
|
| + error = gray_convert_glyph_inner( RAS_VAR );
|
| +
|
| + if ( !error )
|
| + {
|
| + gray_sweep( RAS_VAR_ &ras.target );
|
| + band--;
|
| + continue;
|
| + }
|
| + else if ( error != ErrRaster_Memory_Overflow )
|
| + return 1;
|
| +
|
| + ReduceBands:
|
| + /* render pool overflow; we will reduce the render band by half */
|
| + bottom = band->min;
|
| + top = band->max;
|
| + middle = bottom + ( ( top - bottom ) >> 1 );
|
| +
|
| + /* This is too complex for a single scanline; there must */
|
| + /* be some problems. */
|
| + if ( middle == bottom )
|
| + {
|
| +#ifdef FT_DEBUG_LEVEL_TRACE
|
| + FT_TRACE7(( "gray_convert_glyph: rotten glyph\n" ));
|
| +#endif
|
| + return 1;
|
| + }
|
| +
|
| + if ( bottom-top >= ras.band_size )
|
| + ras.band_shoot++;
|
| +
|
| + band[1].min = bottom;
|
| + band[1].max = middle;
|
| + band[0].min = middle;
|
| + band[0].max = top;
|
| + band++;
|
| + } while ( band >= bands );
|
| + }
|
| +
|
| + if ( ras.band_shoot > 8 && ras.band_size > 16 )
|
| + ras.band_size = ras.band_size / 2;
|
| +
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static int
|
| + gray_raster_render( gray_PRaster raster,
|
| + const FT_Raster_Params* params )
|
| + {
|
| + const FT_Outline* outline = (const FT_Outline*)params->source;
|
| + const FT_Bitmap* target_map = params->target;
|
| +
|
| + gray_TWorker worker[1];
|
| +
|
| + TCell buffer[FT_MAX( FT_RENDER_POOL_SIZE, 2048 ) / sizeof ( TCell )];
|
| + long buffer_size = sizeof ( buffer );
|
| + int band_size = (int)( buffer_size /
|
| + (long)( sizeof ( TCell ) * 8 ) );
|
| +
|
| +
|
| + if ( !raster )
|
| + return FT_THROW( Invalid_Argument );
|
| +
|
| + if ( !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 FT_THROW( Invalid_Outline );
|
| +
|
| + if ( outline->n_points !=
|
| + outline->contours[outline->n_contours - 1] + 1 )
|
| + return FT_THROW( Invalid_Outline );
|
| +
|
| + /* if direct mode is not set, we must have a target bitmap */
|
| + if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
|
| + {
|
| + if ( !target_map )
|
| + return FT_THROW( Invalid_Argument );
|
| +
|
| + /* nothing to do */
|
| + if ( !target_map->width || !target_map->rows )
|
| + return 0;
|
| +
|
| + if ( !target_map->buffer )
|
| + return FT_THROW( Invalid_Argument );
|
| + }
|
| +
|
| + /* this version does not support monochrome rendering */
|
| + if ( !( params->flags & FT_RASTER_FLAG_AA ) )
|
| + return FT_THROW( Invalid_Mode );
|
| +
|
| + /* compute clipping box */
|
| + if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
|
| + {
|
| + /* compute clip box from target pixmap */
|
| + ras.clip_box.xMin = 0;
|
| + ras.clip_box.yMin = 0;
|
| + ras.clip_box.xMax = (FT_Pos)target_map->width;
|
| + ras.clip_box.yMax = (FT_Pos)target_map->rows;
|
| + }
|
| + else if ( params->flags & FT_RASTER_FLAG_CLIP )
|
| + ras.clip_box = params->clip_box;
|
| + else
|
| + {
|
| + ras.clip_box.xMin = -32768L;
|
| + ras.clip_box.yMin = -32768L;
|
| + ras.clip_box.xMax = 32767L;
|
| + ras.clip_box.yMax = 32767L;
|
| + }
|
| +
|
| + gray_init_cells( RAS_VAR_ buffer, buffer_size );
|
| +
|
| + ras.outline = *outline;
|
| + ras.num_cells = 0;
|
| + ras.invalid = 1;
|
| + ras.band_size = band_size;
|
| + ras.num_gray_spans = 0;
|
| + ras.span_y = 0;
|
| +
|
| + if ( params->flags & FT_RASTER_FLAG_DIRECT )
|
| + {
|
| + ras.render_span = (FT_Raster_Span_Func)params->gray_spans;
|
| + ras.render_span_data = params->user;
|
| + }
|
| + else
|
| + {
|
| + ras.target = *target_map;
|
| + ras.render_span = (FT_Raster_Span_Func)gray_render_span;
|
| + ras.render_span_data = &ras;
|
| + }
|
| +
|
| + return gray_convert_glyph( RAS_VAR );
|
| + }
|
| +
|
| +
|
| + /**** RASTER OBJECT CREATION: In stand-alone mode, we simply use *****/
|
| + /**** a static object. *****/
|
| +
|
| +#ifdef _STANDALONE_
|
| +
|
| + static int
|
| + gray_raster_new( void* memory,
|
| + FT_Raster* araster )
|
| + {
|
| + static gray_TRaster the_raster;
|
| +
|
| + FT_UNUSED( memory );
|
| +
|
| +
|
| + *araster = (FT_Raster)&the_raster;
|
| + FT_MEM_ZERO( &the_raster, sizeof ( the_raster ) );
|
| +
|
| + return 0;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_raster_done( FT_Raster raster )
|
| + {
|
| + /* nothing */
|
| + FT_UNUSED( raster );
|
| + }
|
| +
|
| +#else /* !_STANDALONE_ */
|
| +
|
| + static int
|
| + gray_raster_new( FT_Memory memory,
|
| + FT_Raster* araster )
|
| + {
|
| + FT_Error error;
|
| + gray_PRaster raster = NULL;
|
| +
|
| +
|
| + *araster = 0;
|
| + if ( !FT_ALLOC( raster, sizeof ( gray_TRaster ) ) )
|
| + {
|
| + raster->memory = memory;
|
| + *araster = (FT_Raster)raster;
|
| + }
|
| +
|
| + return error;
|
| + }
|
| +
|
| +
|
| + static void
|
| + gray_raster_done( FT_Raster raster )
|
| + {
|
| + FT_Memory memory = (FT_Memory)((gray_PRaster)raster)->memory;
|
| +
|
| +
|
| + FT_FREE( raster );
|
| + }
|
| +
|
| +#endif /* !_STANDALONE_ */
|
| +
|
| +
|
| + static void
|
| + gray_raster_reset( FT_Raster raster,
|
| + char* pool_base,
|
| + long pool_size )
|
| + {
|
| + FT_UNUSED( raster );
|
| + FT_UNUSED( pool_base );
|
| + FT_UNUSED( pool_size );
|
| + }
|
| +
|
| +
|
| + 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)gray_raster_set_mode,
|
| + (FT_Raster_Render_Func) gray_raster_render,
|
| + (FT_Raster_Done_Func) gray_raster_done )
|
| +
|
| +
|
| +/* END */
|
| +
|
| +
|
| +/* Local Variables: */
|
| +/* coding: utf-8 */
|
| +/* End: */
|
|
|
Chromium Code Reviews
Issue 1524973002:
Update freetype sources (2.6.2) in third party. (Closed)
Base URL: https://github.com/domokit/mojo.git@master