--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/smooth/ftgrays.c Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,2055 @@
+/***************************************************************************/
+/* */
+/* ftgrays.c */
+/* */
+/* A new `perfect' anti-aliasing renderer (body). */
+/* */
+/* Copyright 2000-2003, 2005-2011 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_
+
+
+ /* 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_UINT_MAX UINT_MAX
+#define FT_INT_MAX INT_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 );
+ }
+
+ /* 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
+
+#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 */
+
+#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 ErrRaster_Invalid_Mode Smooth_Err_Cannot_Render_Glyph
+#define ErrRaster_Invalid_Outline Smooth_Err_Invalid_Outline
+#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
+
+#ifndef FT_MEM_ZERO
+#define FT_MEM_ZERO( dest, count ) FT_MEM_SET( dest, 0, count )
+#endif
+
+ /* as usual, for the speed hungry :-) */
+
+#ifndef FT_STATIC_RASTER
+
+#define RAS_ARG PWorker worker
+#define RAS_ARG_ 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
+
+#define ONE_PIXEL ( 1L << PIXEL_BITS )
+#define PIXEL_MASK ( -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
+
+
+ /*************************************************************************/
+ /* */
+ /* 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 */
+
+
+ /* maximal 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 TWorker.ex */
+ TCoord cover; /* same with TWorker.cover */
+ TArea area;
+ PCell next;
+
+ } TCell;
+
+
+ typedef struct TWorker_
+ {
+ 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;
+
+ TCoord cx, cy;
+ TPos x, y;
+
+ TPos last_ey;
+
+ 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;
+
+ ft_jmp_buf jump_buffer;
+
+ void* buffer;
+ long buffer_size;
+
+ PCell* ycells;
+ TPos ycount;
+
+ } TWorker, *PWorker;
+
+
+#ifndef FT_STATIC_RASTER
+#define ras (*worker)
+#else
+ static TWorker ras;
+#endif
+
+
+ typedef struct TRaster_
+ {
+ void* buffer;
+ long buffer_size;
+ int band_size;
+ void* memory;
+ PWorker worker;
+
+ } TRaster, *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.invalid && ( 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)ey >= (unsigned)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.last_ey = SUBPIXELS( ey );
+ ras.invalid = 0;
+
+ 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, lift, rem;
+ 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;
+ }
+
+ delta = (TCoord)( p / dx );
+ mod = (TCoord)( p % dx );
+ if ( mod < 0 )
+ {
+ delta--;
+ mod += (TCoord)dx;
+ }
+
+ ras.area += (TArea)(( fx1 + first ) * delta);
+ ras.cover += delta;
+
+ ex1 += incr;
+ gray_set_cell( RAS_VAR_ ex1, ey );
+ y1 += 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;
+ }
+
+ 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. */
+ /* */
+ 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.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 ) );
+
+ 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;
+
+
+ min = ey1;
+ max = ey2;
+ if ( ey1 > ey2 )
+ {
+ min = ey2;
+ max = ey1;
+ }
+ if ( min >= ras.max_ey || max < 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;
+ }
+
+ delta = (int)( p / dy );
+ mod = (int)( p % dy );
+ if ( mod < 0 )
+ {
+ delta--;
+ mod += (TCoord)dy;
+ }
+
+ 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;
+ lift = (int)( p / dy );
+ rem = (int)( p % dy );
+ if ( rem < 0 )
+ {
+ lift--;
+ rem += (int)dy;
+ }
+ mod -= (int)dy;
+
+ while ( ey1 != ey2 )
+ {
+ 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 );
+ }
+ }
+
+ gray_render_scanline( RAS_VAR_ ey1, x,
+ (TCoord)( ONE_PIXEL - first ), to_x,
+ fy2 );
+
+ End:
+ ras.x = to_x;
+ ras.y = to_y;
+ ras.last_ey = SUBPIXELS( ey2 );
+ }
+
+
+ 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;
+ int top, level;
+ int* levels;
+ FT_Vector* arc;
+
+
+ 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;
+
+ 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;
+
+ level = 0;
+ while ( dx > ONE_PIXEL / 6 )
+ {
+ dx >>= 2;
+ level++;
+ }
+
+ levels = ras.lev_stack;
+ levels[0] = level;
+ top = 0;
+
+ do
+ {
+ level = levels[top];
+ if ( level > 1 )
+ {
+ /* check that the arc crosses the current band */
+ TPos min, max, y;
+
+
+ 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;
+
+ 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;
+
+
+ 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;
+
+ for (;;)
+ {
+ /* Check that the arc crosses the current band. */
+ TPos min, max, y;
+
+
+ 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;
+
+ /* 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 = 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;
+
+ /* 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;
+
+ /* 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 )
+ 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,
+ PWorker worker )
+ {
+ TPos x, y;
+
+
+ /* record current cell, if any */
+ 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,
+ 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,
+ 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,
+ 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,
+ 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 += (unsigned)( ( map->rows - 1 ) * 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 )
+ {
+ FT_Span* span;
+ int count;
+ 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 )
+ {
+ /* 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;
+
+ count = 0;
+ 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 );
+
+ FT_TRACE7(( "gray_sweep: end\n" ));
+ }
+
+
+#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 || !func_interface )
+ return ErrRaster_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 ErrRaster_Invalid_Outline;
+ }
+
+#endif /* _STANDALONE_ */
+
+
+ typedef struct TBand_
+ {
+ TPos min, max;
+
+ } 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 );
+ gray_record_cell( RAS_VAR );
+ }
+ else
+ error = ErrRaster_Memory_Overflow;
+
+ return error;
+ }
+
+
+ static int
+ gray_convert_glyph( RAS_ARG )
+ {
+ TBand bands[40];
+ 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;
+
+ while ( band >= bands )
+ {
+ 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 = sizeof ( PCell ) * ras.ycount;
+ cell_mod = cell_start % sizeof ( TCell );
+ if ( cell_mod > 0 )
+ cell_start += sizeof ( TCell ) - cell_mod;
+
+ cell_end = ras.buffer_size;
+ cell_end -= cell_end % 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++;
+ }
+ }
+
+ if ( ras.band_shoot > 8 && ras.band_size > 16 )
+ ras.band_size = ras.band_size / 2;
+
+ return 0;
+ }
+
+
+ static int
+ gray_raster_render( PRaster raster,
+ const FT_Raster_Params* params )
+ {
+ const FT_Outline* outline = (const FT_Outline*)params->source;
+ const FT_Bitmap* target_map = params->target;
+ PWorker worker;
+
+
+ if ( !raster || !raster->buffer || !raster->buffer_size )
+ return ErrRaster_Invalid_Argument;
+
+ if ( !outline )
+ return ErrRaster_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;
+
+ if ( outline->n_points !=
+ outline->contours[outline->n_contours - 1] + 1 )
+ return ErrRaster_Invalid_Outline;
+
+ worker = raster->worker;
+
+ /* if direct mode is not set, we must have a target bitmap */
+ if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
+ {
+ if ( !target_map )
+ return ErrRaster_Invalid_Argument;
+
+ /* nothing to do */
+ if ( !target_map->width || !target_map->rows )
+ return 0;
+
+ if ( !target_map->buffer )
+ return ErrRaster_Invalid_Argument;
+ }
+
+ /* this version does not support monochrome rendering */
+ if ( !( params->flags & FT_RASTER_FLAG_AA ) )
+ return ErrRaster_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 = target_map->width;
+ ras.clip_box.yMax = 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_ raster->buffer, raster->buffer_size );
+
+ ras.outline = *outline;
+ ras.num_cells = 0;
+ ras.invalid = 1;
+ ras.band_size = raster->band_size;
+ ras.num_gray_spans = 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 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;
+ PRaster raster = NULL;
+
+
+ *araster = 0;
+ if ( !FT_ALLOC( raster, sizeof ( TRaster ) ) )
+ {
+ raster->memory = memory;
+ *araster = (FT_Raster)raster;
+ }
+
+ return error;
+ }
+
+
+ static void
+ gray_raster_done( FT_Raster raster )
+ {
+ FT_Memory memory = (FT_Memory)((PRaster)raster)->memory;
+
+
+ FT_FREE( raster );
+ }
+
+#endif /* !_STANDALONE_ */
+
+
+ static void
+ gray_raster_reset( FT_Raster raster,
+ char* pool_base,
+ long pool_size )
+ {
+ PRaster rast = (PRaster)raster;
+
+
+ if ( raster )
+ {
+ if ( pool_base && pool_size >= (long)sizeof ( TWorker ) + 2048 )
+ {
+ PWorker worker = (PWorker)pool_base;
+
+
+ rast->worker = worker;
+ rast->buffer = pool_base +
+ ( ( sizeof ( TWorker ) + sizeof ( TCell ) - 1 ) &
+ ~( sizeof ( TCell ) - 1 ) );
+ rast->buffer_size = (long)( ( pool_base + pool_size ) -
+ (char*)rast->buffer ) &
+ ~( sizeof ( TCell ) - 1 );
+ rast->band_size = (int)( rast->buffer_size /
+ ( sizeof ( TCell ) * 8 ) );
+ }
+ else
+ {
+ rast->buffer = NULL;
+ rast->buffer_size = 0;
+ rast->worker = NULL;
+ }
+ }
+ }
+
+
+ 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_Render_Func) gray_raster_render,
+ (FT_Raster_Done_Func) gray_raster_done
+ )
+
+
+/* END */
+
+
+/* Local Variables: */
+/* coding: utf-8 */
+/* End: */