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freetype2/demos/src/ftrast2.c

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/*******************************************************************
*
* ftraster.c 2.0
*
* The FreeType glyph rasterizer (body).
*
* Copyright 1996-1998 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.
*
* The "raster" component implements FreeType's scan-line converter,
* the one used to generate bitmaps and pixmaps from vectorial outlines
* descriptions.
*
* It has been rewritten entirely for FreeType 2.0, in order to become
* completely independent of the rest of the library. It should now be
* possible to include it more easily in all kinds of libraries and
* applications, which do not necessarily need the font engines and
* API.
*
* This version features :
*
* - support for third-order bezier arcs
*
* - improved performance of the 5-levels anti-aliasing algorithm
*
* - 17-levels anti-aliasing for smoother curves, though the
* difference isn't always noticeable, depending on your palette
*
* - an API to decompose a raster outline into a path (i.e. into
* a series of segments and arcs).
*
******************************************************************/
#include "ftrast2.h"
#include <freetype/freetype.h> /* for FT_Outline_Decompose */
#ifndef EXPORT_FUNC
#define EXPORT_FUNC /* nothing */
#endif
/**************************************************************************/
/* */
/* We need a 32-bit unsigned word for our optimized 2x2 filter.. The */
/* following uses the ANSI <limits.h> header file to compute exactly */
/* wether to use unsigned int or unsigned long */
/* */
#include <limits.h>
/* The number of bytes in an `int' type. */
#if UINT_MAX == 0xFFFFFFFF
typedef unsigned int Word32;
typedef int Int32;
#elif ULONG_MAX == 0xFFFFFFFF
typedef unsigned long Word32;
typedef long Int32;
#else
#error "could not find a 32-bit word on this machine !!"
#endif
#ifndef _xxFREETYPE_
/**************************************************************************/
/* */
/* The following defines are used when the raster is compiled as a */
/* stand-alone object. Each of them is commented, and you're free to */
/* toggle them to suit your needs.. */
/* */
/**************************************************************************/
/* */
/* FT_RASTER_OPTION_ANTI_ALIAS */
/* */
/* Define this configuration macro if you want to support anti-aliasing */
/* */
#define FT_RASTER_OPTION_ANTI_ALIAS
/**************************************************************************/
/* */
/* FT_RASTER_OPTION_CONIC_BEZIERS */
/* */
/* Define this configuration macro if your source outlines contain */
/* second-order Bezier arcs. Typically, these are TrueType outlines.. */
/* */
#define FT_RASTER_CONIC_BEZIERS
/**************************************************************************/
/* */
/* FT_RASTER_OPTION_CUBIC_BEZIERS */
/* */
/* Define this configuration macro if your source outlines contain */
/* third-order Bezier arcs. Typically, these are Type1 outlines.. */
/* */
#define FT_RASTER_CUBIC_BEZIERS
/**************************************************************************/
/* */
/* FT_RASTER_ANTI_ALIAS_5 */
/* */
/* Define this configuration macro if you want to enable the 5-grays */
/* anti-aliasing mode.. Ignored if FT_RASTER_OPTION_ANTI_ALIAS isn't */
/* defined.. */
/* */
#define FT_RASTER_ANTI_ALIAS_5
/**************************************************************************/
/* */
/* FT_RASTER_ANTI_ALIAS_17 */
/* */
/* Define this configuration macro if you want to enable the 17-grays */
/* anti-aliasing mode.. Ignored if FT_RASTER_OPTION_ANTI_ALIAS isn't */
/* defined.. */
/* */
#undef FT_RASTER_ANTI_ALIAS_17
/**************************************************************************/
/* */
/* FT_RASTER_LITTLE_ENDIAN */
/* FT_RASTER_BIG_ENDIAN */
/* */
/* The default anti-alias routines are processor-independent, but slow. */
/* Define one of these macros to suit your own system, and enjoy */
/* greatly improved rendering speed */
/* */
/* #define FT_RASTER_LITTLE_ENDIAN */
/* #define FT_RASTER_BIG_ENDIAN */
#else /* _FREETYPE_ */
/**************************************************************************/
/* */
/* The following defines are used when the raster is compiled within */
/* the FreeType base layer. Don't change these unless you really know */
/* what you're doing.. */
/* */
#ifdef FT_CONFIG_OPTION_ANTI_ALIAS
#define FT_RASTER_OPTION_ANTI_ALIAS
#endif
#define FT_RASTER_CONIC_BEZIERS
#define FT_RASTER_CUBIC_BEZIERS
#define FT_RASTER_ANTI_ALIAS_5
#undef FT_RASTER_ANTI_ALIAS_17
#ifdef FT_CONFIG_OPTION_LITTLE_ENDIAN
#define FT_RASTER_LITTLE_ENDIAN
#endif
#ifdef FT_CONFIG_OPTION_BIG_ENDIAN
#define FT_RASTER_BIG_ENDIAN
#endif
#endif /* _FREETYPE_ */
/* FT_RASTER_ANY_ENDIAN indicates that no endianess was defined */
/* through one of the configuration macros */
/* */
#if !defined(FT_RASTER_LITTLE_ENDIAN) && !defined(FT_RASTER_BIG_ENDIAN)
#define FT_RASTER_ANY_ENDIAN
#endif
/* The rasterizer is a very general purpose component, please leave */
/* the following redefinitions there (you never know your target */
/* environment). */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL (void*)0
#endif
#undef FAILURE
#define FAILURE TRUE
#undef SUCCESS
#define SUCCESS FALSE
/* Please don't touch the following macros. Their importance is historical */
/* to FreeType, but they have some nice effects, like getting rid of all */
/* '->' symbols when accessing the raster object.. (replacing them with */
/* a simple '.' ) */
/* used in function signatures to define the _first_ argument */
#define RAS_ARGS FT_Raster raster,
#define RAS_ARG FT_Raster raster
/* used to call a function within this component, first parameter */
#define RAS_VARS raster,
#define RAS_VAR raster
/* used to access the current raster object, with a '.' instead of a '->' */
#define ras (*raster)
#define UNUSED_RASTER (void)raster;
/* For anti-aliasing modes, we use a 2 or 4 lines intermediate bitmap which */
/* is filtered repeatedly to render each pixmap row. The following macro */
/* defines this buffer's size in bytes (which is part of raster objects) */
#define ANTI_ALIAS_BUFFER_SIZE 2048
/* Error codes returned by the scan-line converter/raster */
#define ErrRaster_Ok 0
#define ErrRaster_Uninitialised_Object 1
#define ErrRaster_Overflow 2
#define ErrRaster_Negative_Height 3
#define ErrRaster_Invalid_Outline 4
#define ErrRaster_Invalid_Map 5
#define ErrRaster_AntiAlias_Unsupported 6
#define ErrRaster_Invalid_Pool 7
#define ErrRaster_Unimplemented 8
#define ErrRaster_Bad_Palette_Count 9
#define SET_High_Precision(p) Set_High_Precision( RAS_VARS p )
/* Fast MulDiv, as 'b' is always < 64, don't use intermediate precision */
#define FMulDiv( a, b, c ) ( (a) * (b) / (c) )
/* Define DEBUG_RASTER if you want to generate a debug version of the */
/* rasterizer. This will progressively draw the glyphs while all the */
/* computation are done directly on the graphics screen (the glyphs */
/* will be inverted). */
/* Note that DEBUG_RASTER should only be used for debugging with b/w */
/* rendering, not with gray levels. */
/* The definition of DEBUG_RASTER should appear in the file */
/* "ftconfig.h". */
#ifdef DEBUG_RASTER
extern char* vio; /* A pointer to VRAM or display buffer */
#endif
#define MaxBezier 32 /* The maximum number of stacked Bezier curves. */
/* Setting this constant to more than 32 is a */
/* pure waste of space. */
#define Pixel_Bits 6 /* fractional bits of *input* coordinates */
/* We always use 26.6, but hackers are free */
/* to experiment with different values */
/* The type of the pixel coordinates used within the render pool during */
/* scan-line conversion. We use longs to store either 26.6 or 22.10 fixed */
/* float values, depending on the "precision" we want to use (resp. low */
/* or high). These are ideals in order to subdivise bezier arcs in halves */
/* though simple additions and shifts. */
typedef Int32 TPos, *PPos;
/* The type of a scanline position/coordinate within a map */
typedef int TScan, *PScan;
/* boolean type */
typedef char TBool;
/* unsigned char type and array */
typedef unsigned char TByte, *PByte;
/* unsigned short type and array */
typedef unsigned short UShort, *PUShort;
/* flow */
enum _TFlow
{
FT_Flow_Error = 0,
FT_Flow_Down = -1,
FT_Flow_Up = 1
};
/* states/directions of each line, arc and profile */
enum _TDirection
{
Unknown,
Ascending,
Descending,
Flat
};
typedef enum _TDirection TDirection;
struct _TProfile;
typedef struct _TProfile TProfile;
typedef TProfile* PProfile;
struct _TProfile
{
TPos X; /* current coordinate during sweep */
PProfile link; /* link to next profile - various purpose */
PPos offset; /* start of profile's data in render pool */
int flow; /* Profile orientation: Asc/Descending */
TScan height; /* profile's height in scanlines */
TScan start; /* profile's starting scanline */
TScan countL; /* number of lines to step before this */
/* profile becomes drawable */
PProfile next; /* next profile in same contour, used */
/* during drop-out control */
};
typedef PProfile TProfileList;
typedef PProfile* PProfileList;
/* Simple record used to implement a stack of bands, required */
/* by the sub-banding mechanism */
/* */
struct _TBand
{
TScan y_min; /* band's minimum */
TScan y_max; /* band's maximum */
};
typedef struct _TBand TBand;
/* The size in _TPos_ of a profile record in the render pool */
#define AlignProfileSize ((sizeof(TProfile)+sizeof(TPos)-1) / sizeof(TPos))
/* prototypes used for sweep function dispatch */
typedef void Function_Sweep_Init( RAS_ARGS int* min, int* max );
typedef void Function_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 );
typedef int Function_Test_Pixel( RAS_ARGS TScan y,
int x );
typedef void Function_Set_Pixel( RAS_ARGS TScan y,
int x,
int color );
typedef void Function_Sweep_Step( RAS_ARG );
/* compute lowest integer coordinate below a given x */
#define FLOOR( x ) ( (x) & ras.precision_mask )
/* compute highest integer coordinate above a given x */
#define CEILING( x ) ( ((x) + ras.precision - 1) & ras.precision_mask )
/* get integer coordinate of a given 26.6 or 22.10 'x' coordinate - no round */
#define TRUNC( x ) ( (signed long)(x) >> ras.precision_bits )
/* get the fractional part of a given coordinate */
#define FRAC( x ) ( (x) & (ras.precision - 1) )
/* scale an 'input coordinate' (as found in FT_Outline structures) into */
/* a 'work coordinate', which depends on current resolution and render */
/* mode.. */
#define SCALED( x ) ( ((x) << ras.scale_shift) - ras.precision_half )
/* DEBUG_PSET is used to plot a single pixel in VRam during debug mode */
#ifdef DEBUG_RASTER
#define DEBUG_PSET Pset()
#else
#define DEBUG_PSET
#endif
struct _TPoint
{
TPos x, y;
};
typedef struct _TPoint TPoint;
/* Note that I have moved the location of some fields in the */
/* structure to ensure that the most used variables are used */
/* at the top. Thus, their offset can be coded with less */
/* opcodes, and it results in a smaller executable. */
struct FT_RasterRec_
{
PPos cursor; /* Current cursor in render pool */
PPos pool; /* The render pool base address */
PPos pool_size; /* The render pool's size */
PPos pool_limit; /* Limit of profiles zone in pool */
int bit_width; /* target bitmap width */
PByte bit_buffer; /* target bitmap buffer */
PByte pix_buffer; /* target pixmap buffer */
TPoint last;
long minY, maxY;
int error;
int precision_bits; /* precision related variables */
int precision;
int precision_half;
long precision_mask;
int precision_shift;
int precision_step;
int precision_jitter;
FT_Outline* outline;
int n_points; /* number of points in current glyph */
int n_contours; /* number of contours in current glyph */
int n_turns; /* number of Y-turns in outline */
TPoint* arc; /* current Bezier arc pointer */
int num_profs; /* current number of profiles */
TBool fresh; /* signals a fresh new profile which */
/* 'start' field must be completed */
TBool joint; /* signals that the last arc ended */
/* exactly on a scanline. Allows */
/* removal of doublets */
PProfile cur_prof; /* current profile */
PProfile start_prof; /* head of linked list of profiles */
PProfile first_prof; /* contour's first profile in case */
/* of impact */
TDirection state; /* rendering state */
FT_Bitmap target; /* description of target bit/pixmap */
int trace_bit; /* current offset in target bitmap */
int trace_pix; /* current offset in target pixmap */
int trace_incr; /* sweep's increment in target bitmap */
int gray_min_x; /* current min x during gray rendering */
int gray_max_x; /* current max x during gray rendering */
/* dispatch variables */
Function_Sweep_Init* Proc_Sweep_Init;
Function_Sweep_Span* Proc_Sweep_Span;
Function_Sweep_Step* Proc_Sweep_Step;
Function_Test_Pixel* Proc_Test_Pixel;
Function_Set_Pixel* Proc_Set_Pixel;
int scale_shift; /* == 0 for bitmaps */
/* == 1 for 5-levels pixmaps */
/* == 2 for 17-levels pixmaps */
TByte dropout_mode; /* current drop_out control method */
TBool second_pass; /* indicates wether a horizontal pass */
/* should be performed to control drop-out */
/* accurately when calling Render_Glyph. */
/* Note that there is no horizontal pass */
/* during gray rendering. */
TBool flipped; /* this flag is set during the rendering to */
/* indicate the second pass.. */
TBand band_stack[16]; /* band stack used for sub-banding */
int band_top; /* band stack top */
TPoint arcs[ 2*MaxBezier+1 ]; /* The Bezier stack */
void* memory;
#if defined(FT_RASTER_OPTION_ANTI_ALIAS)
long grays[20]; /* Palette of gray levels used for render */
int gray_width; /* length in bytes of the monochrome */
/* intermediate scanline of gray_lines. */
/* Each gray pixel takes 2 or 4 bits long */
/* The gray_lines must hold 2 lines, thus with size */
/* in bytes of at least 'gray_width*2' */
int grays_count; /* number of entries in the palette */
char gray_lines[ANTI_ALIAS_BUFFER_SIZE];
/* Intermediate table used to render the */
/* graylevels pixmaps. */
/* gray_lines is a buffer holding 2 or 4 */
/* monochrome scanlines */
int count_table[256]; /* Look-up table used to quickly count */
/* set bits in a gray 2x2 cell */
#endif
};
#ifdef DEBUG_RASTER
/************************************************/
/* */
/* Pset: */
/* */
/* Used for debugging only. Plots a point */
/* in VRAM during rendering (not afterwards). */
/* */
/* NOTE: This procedure relies on the value */
/* of cProfile->start, which may not */
/* be set when Pset is called sometimes. */
/* This will usually result in a dot */
/* plotted on the first screen scanline */
/* (far away its original position). */
/* */
/* This "bug" reflects nothing wrong */
/* in the current implementation, and */
/* the bitmap is rendered correctly, */
/* so don't panic if you see 'flying' */
/* dots in debugging mode. */
/* */
/* - David */
/* */
/************************************************/
static void Pset( RAS_ARG )
{
long o;
long x;
x = ras.cursor[-1];
switch ( ras.cur_prof->flow )
{
case FT_Flow_Up:
o = Vio_ScanLineWidth *
( ras.cursor - ras.cur_prof->offset + ras.cur_prof->start ) +
( x / (ras.precision*8) );
break;
case FT_Flow_Down:
o = Vio_ScanLineWidth *
( ras.cur_prof->start - ras.cursor + ras.cur_prof->offset ) +
( x / (ras.precision*8) );
break;
}
if ( o > 0 )
Vio[o] |= (unsigned)0x80 >> ( (x/ras.precision) & 7 );
}
static void Clear_Band( RAS_ARGS Int y1, Int y2 )
{
MEM_Set( Vio + y1*Vio_ScanLineWidth, (y2-y1+1)*Vio_ScanLineWidth, 0 );
}
#endif /* DEBUG_RASTER */
/************************************************************************/
/* */
/* <Function> Set_High_Precision */
/* */
/* <Description> Sets precision variables according to param flag. */
/* */
/* <Input> High :: set to True for high precision (typically for */
/* ppem < 18), false otherwise. */
/* */
/************************************************************************/
static
void Set_High_Precision( RAS_ARGS int High )
{
if ( High )
{
ras.precision_bits = 10;
ras.precision_step = 128;
ras.precision_jitter = 24;
}
else
{
ras.precision_bits = 6;
ras.precision_step = 32;
ras.precision_jitter = 2;
}
ras.precision = 1 << ras.precision_bits;
ras.precision_half = ras.precision / 2;
ras.precision_shift = ras.precision_bits - Pixel_Bits;
ras.precision_mask = -ras.precision;
}
/**************************************************************************/
/* */
/* <Function> New_Profile */
/* */
/* <Description> Creates a new Profile in the render pool. */
/* */
/* <Input> */
/* aState :: state/orientation of the new Profile */
/* */
/* <Return> */
/* SUCCESS or FAILURE */
/* */
/**************************************************************************/
static
TBool New_Profile( RAS_ARGS TDirection direction )
{
if ( ras.start_prof == NULL )
{
ras.cur_prof = (PProfile)ras.cursor;
ras.start_prof = ras.cur_prof;
ras.cursor += AlignProfileSize;
}
if ( ras.cursor >= ras.pool_limit )
{
ras.error = ErrRaster_Overflow;
return FAILURE;
}
switch ( direction )
{
case Ascending:
ras.cur_prof->flow = FT_Flow_Up;
break;
case Descending:
ras.cur_prof->flow = FT_Flow_Down;
break;
default:
ras.error = ErrRaster_Invalid_Map;
return FAILURE;
}
{
PProfile cur = ras.cur_prof;
cur->start = 0;
cur->height = 0;
cur->offset = ras.cursor;
cur->link = (PProfile)0;
cur->next = (PProfile)0;
}
if ( ras.first_prof == NULL )
ras.first_prof = ras.cur_prof;
ras.state = direction;
ras.fresh = TRUE;
ras.joint = FALSE;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> End_Profile */
/* */
/* <Description> Finalizes the current Profile. */
/* */
/* <Return> */
/* SUCCESS or FAILURE */
/* */
/****************************************************************************/
static
TBool End_Profile( RAS_ARG )
{
int h;
h = ras.cursor - ras.cur_prof->offset;
if ( h < 0 )
{
ras.error = ErrRaster_Negative_Height;
return FAILURE;
}
if ( h > 0 )
{
PProfile old, new;
old = ras.cur_prof;
old->height = h;
ras.cur_prof = new = (PProfile)ras.cursor;
ras.cursor += AlignProfileSize;
new->height = 0;
new->offset = ras.cursor;
old->next = new;
ras.num_profs++;
}
if ( ras.cursor >= ras.pool_limit )
{
ras.error = ErrRaster_Overflow;
return FAILURE;
}
ras.joint = FALSE;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Insert_Y_Turn */
/* */
/* <Description> */
/* Insert a salient into the sorted list placed on top */
/* of the render pool */
/* */
/* <Input> */
/* y :: new scanline position */
/* */
/****************************************************************************/
static
TBool Insert_Y_Turn( RAS_ARGS TScan y )
{
PPos y_turns;
TScan y2;
int n;
n = ras.n_turns-1;
y_turns = ras.pool_size - ras.n_turns;
/* look for first y value that is <= */
while ( n >= 0 && y < y_turns[n] )
n--;
/* if it is <, simply insert it, ignore if == */
if ( n >= 0 && y > y_turns[n] )
while (n >= 0)
{
y2 = y_turns[n];
y_turns[n] = y;
y = y2;
n--;
}
if (n < 0)
{
ras.pool_limit--;
ras.n_turns++;
ras.pool_size[-ras.n_turns ] = y;
if ( ras.pool_limit <= ras.cursor )
{
ras.error = ErrRaster_Overflow;
return FAILURE;
}
}
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Finalize_Profile_Table */
/* */
/* <Description> */
/* Adjusts all links in the Profiles list. */
/* */
/****************************************************************************/
static
TBool Finalize_Profile_Table( RAS_ARG )
{
int n, bottom, top;
PProfile p;
n = ras.num_profs;
if ( n > 1 )
{
p = ras.start_prof;
while ( n > 0 )
{
if (n > 1)
p->link = (PProfile)( p->offset + p->height );
else
p->link = NULL;
switch (p->flow)
{
case FT_Flow_Down:
bottom = p->start - p->height+1;
top = p->start;
p->start = bottom;
p->offset += p->height-1;
break;
case FT_Flow_Up:
default:
bottom = p->start;
top = p->start + p->height-1;
}
if ( Insert_Y_Turn( RAS_VARS bottom ) ||
Insert_Y_Turn( RAS_VARS top+1 ) )
return FAILURE;
p = p->link;
n--;
}
}
else
ras.start_prof = NULL;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Line_Up */
/* */
/* <Description> */
/* Computes the scan-line intersections of an ascending line segment */
/* and stores them in the render pool. */
/* */
/* <Input> */
/* x1 :: start x coordinate */
/* y1 :: start y coordinates */
/* x2 :: end x coordinate */
/* y2 :: end y coordinate */
/* miny :: minimum vertical grid coordinate */
/* maxy :: maximum vertical grid coordinate */
/* */
/* <Return> */
/* SUCCESS or FAILURE. */
/* */
/****************************************************************************/
static
TBool Line_Up( RAS_ARGS TPos x1, TPos y1,
TPos x2, TPos y2,
TPos miny, TPos maxy )
{
TPos Dx, Dy;
int e1, e2, f1, f2, size;
TPos Ix, Rx, Ax;
PPos top;
Dx = x2 - x1;
Dy = y2 - y1;
if ( Dy <= 0 || y2 < miny || y1 > maxy )
return SUCCESS;
if ( y1 < miny )
{
x1 += FMulDiv( Dx, miny - y1, Dy );
e1 = TRUNC( miny );
f1 = 0;
}
else
{
e1 = TRUNC( y1 );
f1 = FRAC( y1 );
}
if ( y2 > maxy )
{
/* x2 += FMulDiv( Dx, maxy-y2, Dy ); UNNECESSARY */
e2 = TRUNC( maxy );
f2 = 0;
}
else
{
e2 = TRUNC( y2 );
f2 = FRAC( y2 );
}
if ( f1 > 0 )
{
if ( e1 == e2 ) return SUCCESS;
else
{
x1 += FMulDiv( Dx, ras.precision - f1, Dy );
e1 += 1;
}
}
else
if ( ras.joint )
{
ras.cursor--;
ras.joint = FALSE;
}
ras.joint = ( f2 == 0 );
if ( ras.fresh )
{
ras.cur_prof->start = e1;
ras.fresh = FALSE;
}
size = e2 - e1 + 1;
if ( ras.cursor + size >= ras.pool_limit )
{
ras.error = ErrRaster_Overflow;
return FAILURE;
}
if ( Dx > 0 )
{
Ix = (ras.precision*Dx) / Dy;
Rx = (ras.precision*Dx) % Dy;
Dx = 1;
}
else
{
Ix = -( (ras.precision*-Dx) / Dy );
Rx = (ras.precision*-Dx) % Dy;
Dx = -1;
}
Ax = -Dy;
top = ras.cursor;
while ( size > 0 )
{
*top++ = x1;
DEBUG_PSET;
x1 += Ix;
Ax += Rx;
if ( Ax >= 0 )
{
Ax -= Dy;
x1 += Dx;
}
size--;
}
ras.cursor = top;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Line_Down */
/* */
/* <Description> */
/* Computes the scan-line intersections of a descending line segment */
/* and stores them in the render pool. */
/* */
/* <Input> */
/* x1 :: start x coordinate */
/* y1 :: start y coordinates */
/* x2 :: end x coordinate */
/* y2 :: end y coordinate */
/* miny :: minimum vertical grid coordinate */
/* maxy :: maximum vertical grid coordinate */
/* */
/* <Return> */
/* SUCCESS or FAILURE. */
/* */
/****************************************************************************/
static
TBool Line_Down( RAS_ARGS TPos x1, TPos y1,
TPos x2, TPos y2,
TPos miny, TPos maxy )
{
TBool result, fresh;
fresh = ras.fresh;
result = Line_Up( RAS_VARS x1, -y1, x2, -y2, -maxy, -miny );
if ( fresh && !ras.fresh )
ras.cur_prof->start = -ras.cur_prof->start;
return result;
}
#ifdef FT_RASTER_CONIC_BEZIERS
/****************************************************************************/
/* */
/* <Function> Split_Conic */
/* */
/* <Description> */
/* Subdivides one second-order Bezier arc into two joint sub-arcs in */
/* the Bezier stack. */
/* */
/* <Note> */
/* This routine is the "beef" of the component. It is one of _the_ */
/* inner loops that should be optimized like hell to get the best */
/* performance.. */
/* */
/****************************************************************************/
static
void Split_Conic( TPoint* 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;
}
#endif
#ifdef FT_RASTER_CUBIC_BEZIERS
/****************************************************************************/
/* */
/* <Function> Split_Cubic */
/* */
/* <Description> */
/* Subdivides a third-order Bezier arc into two joint sub-arcs in the */
/* Bezier stack. */
/* */
/* <Note> */
/* This routine is the "beef" of the component. It is one of _the_ */
/* inner loops that should be optimized like hell to get the best */
/* performance.. */
/* */
/****************************************************************************/
static
void Split_Cubic( TPoint* 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;
}
#endif
/* A function type describing the functions used to split bezier arcs */
typedef void (*TSplitter)( TPoint* base );
#ifdef FT_DYNAMIC_BEZIER_STEPS
static
TPos Dynamic_Bezier_Threshold( RAS_ARGS int degree, TPoint* arc )
{
TPos min_x, max_x, min_y, max_y, A, B;
TPos wide_x, wide_y, threshold;
TPoint* cur = arc;
TPoint* limit = cur + degree;
/* first of all, set the threshold to the maximum x or y extent */
min_x = max_x = arc[0].x;
min_y = max_y = arc[0].y;
cur++;
for ( ; cur < limit; cur++ )
{
TPos x = cur->x;
TPos y = cur->y;
if ( x < min_x ) min_x = x;
if ( x > max_x ) max_x = x;
if ( y < min_y ) min_y = y;
if ( y > max_y ) max_y = y;
}
wide_x = (max_x - min_x) << 4;
wide_y = (max_y - min_y) << 4;
threshold = wide_x;
if (threshold < wide_y) threshold = wide_y;
/* now compute the second and third order error values */
wide_x = arc[0].x + arc[1].x - arc[2].x*2;
wide_y = arc[0].y + arc[1].y - arc[2].y*2;
if (wide_x < 0) wide_x = -wide_x;
if (wide_y < 0) wide_y = -wide_y;
A = wide_x; if ( A < wide_y ) A = wide_y;
if (degree >= 3)
{
wide_x = arc[3].x - arc[0].x + 3*(arc[2].x - arc[3].x);
wide_y = arc[3].y - arc[0].y + 3*(arc[2].y - arc[3].y);
if (wide_x < 0) wide_x = -wide_x;
if (wide_y < 0) wide_y = -wide_y;
B = wide_x; if ( B < wide_y ) B = wide_y;
}
else
B = 0;
while ( A > 0 || B > 0 )
{
threshold >>= 1;
A >>= 2;
B >>= 3;
}
if (threshold < PRECISION_STEP)
threshold = PRECISION_STEP;
return threshold;
}
#endif
/*************************************************************************/
/* */
/* <Function> */
/* Bezier_Up */
/* */
/* <Description> */
/* Computes the scan-line intersections of an ascending second-order */
/* Bezier arc and stores them in the render pool. The arc is taken */
/* from the top of the stack. */
/* */
/* <Input> */
/* miny :: The minimum vertical grid coordinate. */
/* maxy :: The maximum vertical grid coordinate. */
/* */
/* <Return> */
/* SUCCESS or FAILURE. */
/* */
static
TBool Bezier_Up( RAS_ARGS int degree,
TSplitter splitter,
TPos miny,
TPos maxy )
{
TPos y1, y2, e, e2, e0, threshold;
int f1;
TPoint* arc;
TPoint* start_arc;
PPos top;
arc = ras.arc;
y1 = arc[degree].y;
y2 = arc[0].y;
top = ras.cursor;
if ( y2 < miny || y1 > maxy )
goto Fin;
e2 = FLOOR( y2 ); /* integer end y */
if ( e2 > maxy )
e2 = maxy;
e0 = miny;
if ( y1 < miny )
{
e = e0; /* integer start y == current scanline */
}
else
{
e = CEILING( y1 ); /* integer start y == current scanline */
f1 = FRAC( y1 ); /* fractional shift of start y */
e0 = e; /* first integer scanline to be pushed */
if ( f1 == 0 ) /* do we start on an integer scanline? */
{
if ( ras.joint )
{
top--;
ras.joint = FALSE;
}
*top++ = arc[degree].x; /* write directly start position */
DEBUG_PSET;
e += ras.precision; /* go to next scanline */
}
}
/* record start position if necessary */
if ( ras.fresh )
{
ras.cur_prof->start = TRUNC( e0 );
ras.fresh = FALSE;
}
/* exit if the current scanline is already above the max scanline */
if ( e2 < e )
goto Fin;
/* check for overflow */
if ( ( top + TRUNC( e2 - e ) + 1 ) >= ras.pool_limit )
{
ras.cursor = top;
ras.error = ErrRaster_Overflow;
return FAILURE;
}
#ifdef FT_DYNAMIC_BEZIER_STEPS
/* compute dynamic bezier step threshold */
threshold = Dynamic_Bezier_Threshold( RAS_VAR_ degree, arc );
#else
threshold = ras.precision_step;
#endif
start_arc = arc;
/* loop while there is still an arc on the bezier stack */
/* and the current scan line is below y max == e2 */
while ( arc >= start_arc && e <= e2 )
{
ras.joint = FALSE;
y2 = arc[0].y; /* final y of the top-most arc */
if ( y2 > e ) /* the arc intercepts the current scanline */
{
y1 = arc[degree].y; /* start y of top-most arc */
#ifdef OLD
if ( y2-y1 >= ras.precision_step )
#else
if ( y2 >= e + ras.precision || y2 - y1 >= threshold )
#endif
{
/* if the arc's height is too great, split it */
splitter( arc );
arc += degree;
}
else
{
/* otherwise, approximate it as a segment and compute */
/* its intersection with the current scanline */
*top++ = arc[degree].x +
FMulDiv( arc[0].x-arc[degree].x,
e - y1,
y2 - y1 );
DEBUG_PSET;
arc -= degree; /* pop the arc */
e += ras.precision; /* go to next scanline */
}
}
else
{
if ( y2 == e ) /* if the arc falls on the scanline */
{ /* record its _joint_ intersection */
ras.joint = TRUE;
*top++ = arc[0].x;
DEBUG_PSET;
e += ras.precision; /* go to next scanline */
}
arc -= degree; /* pop the arc */
}
}
Fin:
ras.cursor = top;
ras.arc -= degree;
return SUCCESS;
}
/*************************************************************************/
/* */
/* <Function> */
/* Bezier_Down */
/* */
/* <Description> */
/* Computes the scan-line intersections of a descending second-order */
/* Bezier arc and stores them in the render pool. The arc is taken */
/* from the top of the stack. */
/* */
/* <Input> */
/* miny :: The minimum vertical grid coordinate. */
/* maxy :: The maximum vertical grid coordinate. */
/* */
/* <Return> */
/* SUCCESS or FAILURE. */
/* */
static
TBool Bezier_Down( RAS_ARGS int degree,
TSplitter splitter,
TPos miny,
TPos maxy )
{
TPoint* arc = ras.arc;
TBool result, fresh;
arc[0].y = -arc[0].y;
arc[1].y = -arc[1].y;
arc[2].y = -arc[2].y;
if (degree > 2)
arc[3].y = -arc[3].y;
fresh = ras.fresh;
result = Bezier_Up( RAS_VARS degree, splitter, -maxy, -miny );
if ( fresh && !ras.fresh )
ras.cur_prof->start = -ras.cur_prof->start;
arc[0].y = -arc[0].y;
return result;
}
/****************************************************************************/
/* */
/* <Function> Check_Contour */
/* */
/* <Description> */
/* perform some check at contour closure. */
/* */
/* <Return> */
/* SUCCESS or FAILURE */
/* */
/****************************************************************************/
static
TBool Check_Contour( RAS_ARG )
{
PProfile lastProfile;
/* We must now see if the extreme arcs join or not */
if ( ( FRAC( ras.last.y ) == 0 &&
ras.last.y >= ras.minY &&
ras.last.y <= ras.maxY ) )
{
if ( ras.first_prof && ras.first_prof->flow == ras.cur_prof->flow )
ras.cursor--;
}
lastProfile = ras.cur_prof;
if ( End_Profile( RAS_VAR ) ) return FAILURE;
/* close the 'next profile in contour' linked list */
lastProfile->next = ras.first_prof;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Move_To */
/* */
/* <Description> */
/* This function injects a new contour in the render pool.. */
/* */
/* <Input> */
/* to :: pointer to the contour's first point */
/* raster :: a pointer to the current raster object */
/* */
/* <Return> */
/* Error code, 0 means success */
/* */
/* <Note> */
/* This function is used as a "FTRasterMoveTo_Func" by the outline */
/* decomposer.. */
/* */
/****************************************************************************/
static
int Move_To( FT_Vector* to,
FT_Raster raster )
{
/* if there was already a contour being built, perform some checks */
if ( ras.start_prof )
if ( Check_Contour( RAS_VAR ) )
return FAILURE;
/* set the "current last point" */
if (ras.flipped)
{
ras.last.x = to->y;
ras.last.y = to->x;
}
else
{
ras.last.x = to->x;
ras.last.y = to->y;
}
ras.state = Unknown;
ras.first_prof = NULL;
return SUCCESS;
}
/****************************************************************************/
/* */
/* <Function> Line_To */
/* */
/* <Description> */
/* This function injects a new line segment in the render pool and */
/* adjusts the profiles list accordingly.. */
/* */
/* <Input> */
/* to :: pointer to the target position */
/* raster :: a pointer to the current raster object */
/* */
/* <Return> */
/* Error code, 0 means success */
/* */
/* <Note> */
/* This function is used as a "FTRasterLineTo_Func" by the outline */
/* decomposer.. */
/* */
/****************************************************************************/
static
int Line_To( FT_Vector* to,
FT_Raster raster )
{
TPos x;
TPos y;
TDirection new_state;
if ( ras.flipped )
{
x = to->y;
y = to->x;
}
else
{
x = to->x;
y = to->y;
}
/* First, detect a change of direction */
if ( y != ras.last.y )
{
new_state = ( y > ras.last.y ? Ascending : Descending );
if (new_state != ras.state)
{
if (ras.state != Unknown && End_Profile( RAS_VAR ))
goto Fail;
if ( New_Profile( RAS_VARS new_state) )
goto Fail;
}
}
/* Then compute the lines */
if ( (ras.state == Ascending ? Line_Up : Line_Down)
( RAS_VARS ras.last.x, ras.last.y, x, y, ras.minY, ras.maxY ) )
goto Fail;
ras.last.x = x;
ras.last.y = y;
return SUCCESS;
Fail:
return FAILURE;
}
#ifdef FT_RASTER_CONIC_BEZIERS
/****************************************************************************/
/* */
/* <Function> Conic_To */
/* */
/* <Description> */
/* Injects a new conic bezier arc and adjusts the profile list */
/* accordingly. */
/* */
/* <Input> */
/* control :: pointer to intermediate control point */
/* to :: pointer to end point */
/* raster :: handle to current raster object */
/* */
/* <Return> */
/* Error code, 0 means success */
/* */
/* <Note> */
/* This function is used as a "FTRasterConicTo_Func" by the outline */
/* decomposer.. */
/* */
/****************************************************************************/
static
void Push_Conic( RAS_ARGS FT_Vector* p2,
FT_Vector* p3 )
{
#undef STORE
#define STORE( _arc, point ) \
{ \
TPos x = point->x; \
TPos y = point->y; \
if (ras.flipped) \
{ \
_arc.x = y; \
_arc.y = x; \
} \
else \
{ \
_arc.x = x; \
_arc.y = y; \
} \
}
TPoint* arc;
ras.arc = arc = ras.arcs;
arc[2] = ras.last;
STORE( arc[1], p2 );
STORE( arc[0], p3 );
#undef STORE
}
static
int Conic_To( FT_Vector* control,
FT_Vector* to,
FT_Raster raster )
{
TPos y1, y2, y3, x3;
TDirection state_bez;
Push_Conic( RAS_VARS control, to );
do
{
y1 = ras.arc[2].y;
y2 = ras.arc[1].y;
y3 = ras.arc[0].y;
x3 = ras.arc[0].x;
/* first, categorize the bezier arc */
if( y1 == y3 )
{
if ( y2 == y1 )
state_bez = Flat;
else
state_bez = Unknown;
}
else if ( y1 < y3 )
{
if ( y2 < y1 || y2 > y3 )
state_bez = Unknown;
else
state_bez = Ascending;
}
else
{
if ( y2 < y3 || y2 > y1 )
state_bez = Unknown;
else
state_bez = Descending;
}
/* split non-monotonic arcs, ignore flat ones, or */
/* computes the up and down ones */
switch ( state_bez )
{
case Flat:
ras.arc -= 2;
break;
case Unknown:
Split_Conic( ras.arc );
ras.arc += 2;
break;
default:
/* detect a change of direction */
if ( ras.state != state_bez )
{
if ( ras.state != Unknown && End_Profile( RAS_VAR ) )
goto Fail;
if ( New_Profile( RAS_VARS state_bez ) )
goto Fail;
}
/* compute intersections */
if ( (ras.state == Ascending ? Bezier_Up : Bezier_Down)
( RAS_VARS 2, Split_Conic, ras.minY, ras.maxY ) )
goto Fail;
}
} while ( ras.arc >= ras.arcs );
ras.last.x = x3;
ras.last.y = y3;
return 0;
Fail:
return FAILURE;
}
#else
static
int Conic_To( FT_Vector* control,
FT_Vector* to,
FT_Raster raster )
{
(void)control;
(void)to;
(void)raster;
return ErrRaster_Invalid_Outline;
}
#endif /* CONIC_BEZIERS */
#ifdef FT_RASTER_CUBIC_BEZIERS
/****************************************************************************/
/* */
/* <Function> Cubic_To */
/* */
/* <Description> */
/* Injects a new cubic bezier arc and adjusts the profile list */
/* accordingly. */
/* */
/* <Input> */
/* control1 :: pointer to first control point */
/* control2 :: pointer to second control point */
/* to :: pointer to end point */
/* raster :: handle to current raster object */
/* */
/* <Return> */
/* Error code, 0 means success */
/* */
/* <Note> */
/* This function is used as a "FTRasterCubicTo_Func" by the outline */
/* decomposer.. */
/* */
/****************************************************************************/
static
void Push_Cubic( RAS_ARGS FT_Vector* p2,
FT_Vector* p3,
FT_Vector* p4 )
{
#undef STORE
#define STORE( _arc, point ) \
{ \
TPos x = point->x; \
TPos y = point->y; \
if (ras.flipped) \
{ \
_arc.x = y; \
_arc.y = x; \
} \
else \
{ \
_arc.x = x; \
_arc.y = y; \
} \
}
TPoint* arc;
ras.arc = arc = ras.arcs;
arc[3] = ras.last;
STORE( arc[2], p2 );
STORE( arc[1], p3 );
STORE( arc[0], p4 );
#undef STORE
}
static
int Cubic_To( FT_Vector* control1,
FT_Vector* control2,
FT_Vector* to,
FT_Raster raster )
{
TPos y1, y2, y3, y4, x4;
TDirection state_bez;
Push_Cubic( RAS_VARS control1, control2, to );
do
{
y1 = ras.arc[3].y;
y2 = ras.arc[2].y;
y3 = ras.arc[1].y;
y4 = ras.arc[0].y;
x4 = ras.arc[0].x;
/* first, categorize the bezier arc */
if ( y1 == y4 )
{
if ( y1 == y2 && y1 == y3 )
state_bez = Flat;
else
state_bez = Unknown;
}
else if ( y1 < y4 )
{
if ( y2 < y1 || y2 > y4 || y3 < y1 || y3 > y4 )
state_bez = Unknown;
else
state_bez = Ascending;
}
else
{
if ( y2 < y4 || y2 > y1 || y3 < y4 || y3 > y1 )
state_bez = Unknown;
else
state_bez = Descending;
}
/* split non-monotonic arcs, ignore flat ones, or */
/* computes the up and down ones */
switch ( state_bez )
{
case Flat:
ras.arc -= 3;
break;
case Unknown:
Split_Cubic( ras.arc );
ras.arc += 3;
break;
default:
/* detect a change of direction */
if ( ras.state != state_bez )
{
if ( ras.state != Unknown && End_Profile( RAS_VAR ) )
goto Fail;
if ( New_Profile( RAS_VARS state_bez ) )
goto Fail;
}
/* compute intersections */
if ( (ras.state == Ascending ? Bezier_Up : Bezier_Down)
( RAS_VARS 3, Split_Cubic, ras.minY, ras.maxY ) )
goto Fail;
}
} while ( ras.arc >= ras.arcs );
ras.last.x = x4;
ras.last.y = y4;
return 0;
Fail:
return FAILURE;
}
#else
int Cubic_To( FT_Vector* control1,
FT_Vector* control2,
FT_Vector* to,
FT_Raster raster )
{
(void)control1;
(void)control2;
(void)to;
(void)raster;
return ErrRaster_Invalid_Outline;
}
#endif /* CUBIC_BEZIERS */
/****************************************************************************/
/* */
/* <Function> Convert_Glyph */
/* */
/* <Description> */
/* Converts a glyph into a series of segments and arcs and makes */
/* a profiles list with them.. */
/* */
/* <Input> */
/* outline :: glyph outline */
/* */
/* <Return> */
/* SUCCESS or FAILURE */
/* */
/****************************************************************************/
static
TBool Convert_Glyph( RAS_ARGS FT_Outline* outline )
{
static
FT_Outline_Funcs interface =
{
(FT_Outline_MoveTo_Func)Move_To,
(FT_Outline_LineTo_Func)Line_To,
(FT_Outline_ConicTo_Func)Conic_To,
(FT_Outline_CubicTo_Func)Cubic_To,
0,
0
};
/* Set up state in the raster object */
ras.start_prof = NULL;
ras.joint = FALSE;
ras.fresh = FALSE;
ras.pool_limit = ras.pool_size - AlignProfileSize;
ras.n_turns = 0;
ras.cur_prof = (PProfile)ras.cursor;
ras.cur_prof->offset = ras.cursor;
ras.num_profs = 0;
interface.shift = ras.scale_shift;
interface.delta = ras.precision_half;
/* Now decompose curve */
if ( FT_Outline_Decompose( outline, &interface, &ras ) ) return FAILURE;
/* XXX : the error condition is in ras.error */
/* Check the last contour if needed */
if ( Check_Contour( RAS_VAR ) ) return FAILURE;
/* Finalize profiles list */
return Finalize_Profile_Table( RAS_VAR );
}
/************************************************/
/* */
/* Init_Linked */
/* */
/* Inits an empty linked list. */
/* */
/************************************************/
static void Init_Linked( TProfileList* l )
{
*l = NULL;
}
/************************************************/
/* */
/* InsNew : */
/* */
/* Inserts a new Profile in a linked list. */
/* */
/************************************************/
static void InsNew( PProfileList list,
PProfile profile )
{
PProfile *old, current;
TPos x;
old = list;
current = *old;
x = profile->X;
while ( current )
{
if ( x < current->X )
break;
old = &current->link;
current = *old;
}
profile->link = current;
*old = profile;
}
/*************************************************/
/* */
/* DelOld : */
/* */
/* Removes an old Profile from a linked list. */
/* */
/*************************************************/
static void DelOld( PProfileList list,
PProfile profile )
{
PProfile *old, current;
old = list;
current = *old;
while ( current )
{
if ( current == profile )
{
*old = current->link;
return;
}
old = &current->link;
current = *old;
}
/* we should never get there, unless the Profile was not part of */
/* the list. */
}
/************************************************/
/* */
/* Update : */
/* */
/* Update all X offsets of a drawing list */
/* */
/************************************************/
static void Update( PProfile first )
{
PProfile current = first;
while (current)
{
current->X = *current->offset;
current->offset += current->flow;
current->height--;
current = current->link;
}
}
/************************************************/
/* */
/* Sort : */
/* */
/* Sorts a trace list. In 95%, the list */
/* is already sorted. We need an algorithm */
/* which is fast in this case. Bubble sort */
/* is enough and simple. */
/* */
/************************************************/
static void Sort( PProfileList list )
{
PProfile *old, current, next;
/* First, set the new X coordinate of each profile */
Update( *list );
/* Then sort them */
old = list;
current = *old;
if ( !current )
return;
next = current->link;
while ( next )
{
if ( current->X <= next->X )
{
old = &current->link;
current = *old;
if ( !current )
return;
}
else
{
*old = next;
current->link = next->link;
next->link = current;
old = list;
current = *old;
}
next = current->link;
}
}
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/******** *********/
/******** Vertical Bitmap Sweep Routines *********/
/******** *********/
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/***********************************************************************/
/* */
/* <Function> Vertical_Sweep_Init */
/* */
/* <Description> */
/* Initialise the vertical bitmap sweep. Called by the generic */
/* sweep/draw routine before its loop.. */
/* */
/* <Input> */
/* min :: address of current minimum scanline */
/* max :: address of current maximum scanline */
/* */
/***********************************************************************/
static
void Vertical_Sweep_Init( RAS_ARGS int* min, int* max )
{
long pitch = ras.target.pitch;
(void)max;
ras.trace_incr = -pitch;
ras.trace_bit = -*min*pitch;
if (pitch > 0)
ras.trace_bit += (ras.target.rows-1)*pitch;
ras.gray_min_x = 0;
ras.gray_max_x = 0;
}
/***********************************************************************/
/* */
/* <Function> Vertical_Sweep_Span */
/* */
/* <Description> */
/* draws a single horizontal bitmap span during the vertical */
/* bitmap sweep. */
/* */
/* <Input> */
/* y :: current scanline */
/* x1 :: left span edge */
/* x2 :: right span edge */
/* */
/***********************************************************************/
static void Vertical_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
TPos e1, e2;
int c1, c2;
TByte f1, f2;
TByte* target;
/* Drop-out control */
(void)y;
e1 = TRUNC( CEILING( x1 ) );
if ( x2-x1-ras.precision <= ras.precision_jitter )
e2 = e1;
else
e2 = TRUNC( FLOOR( x2 ) );
if ( e1 <= e2 && e2 >= 0 && e1 < ras.bit_width )
{
if ( e1 < 0 ) e1 = 0;
if ( e2 >= ras.bit_width ) e2 = ras.bit_width-1;
c1 = e1 >> 3;
c2 = e2 >> 3;
f1 = ((unsigned char)0xFF >> (e1 & 7));
f2 = ~((unsigned char)0x7F >> (e2 & 7));
target = ras.bit_buffer + ras.trace_bit + c1;
c2 -= c1;
if ( c2 > 0 )
{
target[0] |= f1;
/* memset is slower than the following code on many platforms */
/* this is due to the fact that, in the vast majority of cases, */
/* the span length in bytes is relatively small.. */
c2--;
while (c2 > 0)
{
* ++target = 0xFF;
c2--;
}
target[1] |= f2;
}
else
*target |= ( f1 & f2 );
}
}
/***********************************************************************/
/* */
/* <Function> Vertical_Test_Pixel */
/* */
/* <Description> */
/* test a pixel 'light' during the vertical bitmap sweep. Used */
/* during drop-out control only.. */
/* */
/* <Input> */
/* y :: current scanline */
/* x :: current x coordinate */
/* */
/***********************************************************************/
static
int Vertical_Test_Pixel( RAS_ARGS TScan y,
int x )
{
int c1 = x >> 3;
(void)y;
return ( x >= 0 && x < ras.bit_width &&
ras.bit_buffer[ras.trace_bit + c1] & (0x80 >> (x & 7)) );
}
/***********************************************************************/
/* */
/* <Function> Vertical_Set_Pixel */
/* */
/* <Description> */
/* Sets a single pixel in a bitmap during the vertical sweep. */
/* Used during drop-out control.. */
/* */
/* <Input> */
/* y :: current scanline */
/* x :: current x coordinate */
/* color :: ignored by this function */
/* */
/***********************************************************************/
static
void Vertical_Set_Pixel( RAS_ARGS int y,
int x,
int color )
{
(void)color; /* unused here */
(void)y;
if ( x >= 0 && x < ras.bit_width )
{
int c1 = x >> 3;
if ( ras.gray_min_x > c1 ) ras.gray_min_x = c1;
if ( ras.gray_max_x < c1 ) ras.gray_max_x = c1;
ras.bit_buffer[ras.trace_bit+c1] |= (char)(0x80 >> (x & 7));
}
}
/***********************************************************************/
/* */
/* <Function> Vertical_Sweep_Step */
/* */
/* <Description> */
/* Called whenever the sweep jumps to anothr scanline. */
/* Only updates the pointers in the vertical bitmap sweep */
/* */
/***********************************************************************/
static
void Vertical_Sweep_Step( RAS_ARG )
{
ras.trace_bit += ras.trace_incr;
}
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/******** *********/
/******** Horizontal Bitmap Sweep Routines *********/
/******** *********/
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/***********************************************************************/
/* */
/* <Function> Horizontal_Sweep_Init */
/* */
/* <Description> */
/* Initialise the horizontal bitmap sweep. Called by the generic */
/* sweep/draw routine before its loop.. */
/* */
/* <Input> */
/* min :: address of current minimum pixel column */
/* max :: address of current maximum pixel column */
/* */
/***********************************************************************/
static void Horizontal_Sweep_Init( RAS_ARGS int* min, int* max )
{
/* nothing, really */
UNUSED_RASTER
(void)min;
(void)max;
}
/***********************************************************************/
/* */
/* <Function> Horizontal_Sweep_Span */
/* */
/* <Description> */
/* draws a single vertical bitmap span during the horizontal */
/* bitmap sweep. Actually, this function is only used to */
/* check for weird drop-out cases.. */
/* */
/* <Input> */
/* y :: current pixel column */
/* x1 :: top span edge */
/* x2 :: bottom span edge */
/* */
/***********************************************************************/
static void Horizontal_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
TPos e1, e2;
PByte bits;
TByte f1;
(void)y;
/* During the horizontal sweep, we only take care of drop-outs */
if ( x2-x1 < ras.precision )
{
e1 = CEILING( x1 );
e2 = FLOOR( x2 );
if ( e1 == e2 )
{
bits = ras.bit_buffer + (y >> 3);
f1 = (TByte)(0x80 >> (y & 7));
e1 = TRUNC( e1 );
if ( e1 >= 0 && e1 < ras.target.rows )
{
long pitch = ras.target.pitch;
bits -= e1*pitch;
if (pitch > 0)
bits += (ras.target.rows-1)*pitch;
bits[0] |= f1;
}
}
}
}
/***********************************************************************/
/* */
/* <Function> Horizontal_Test_Pixel */
/* */
/* <Description> */
/* test a pixel 'light' during the horizontal bitmap sweep. Used */
/* during drop-out control only.. */
/* */
/* <Input> */
/* y :: current pixel column */
/* x :: current row/scanline */
/* */
/***********************************************************************/
static
int Horizontal_Test_Pixel( RAS_ARGS int y,
int x )
{
char* bits = (char*)ras.bit_buffer + (y >> 3);
int f1 = (TByte)(0x80 >> (y & 7));
long pitch = ras.target.pitch;
bits -= x*pitch;
if (pitch > 0)
bits += (ras.target.rows-1)*pitch;
return ( x >= 0 && x < ras.target.rows && (bits[0] & f1) );
}
/***********************************************************************/
/* */
/* <Function> Horizontal_Set_Pixel */
/* */
/* <Description> */
/* Sets a single pixel in a bitmap during the horizontal sweep. */
/* Used during drop-out control.. */
/* */
/* <Input> */
/* y :: current pixel column */
/* x :: current row/scanline */
/* color :: ignored by this function */
/* */
/***********************************************************************/
static
void Horizontal_Set_Pixel( RAS_ARGS int y,
int x,
int color )
{
char* bits = (char*)ras.bit_buffer + (y >> 3);
int f1 = (TByte)(0x80 >> (y & 7));
long pitch = ras.target.pitch;
(void)color; /* unused here */
bits -= x*pitch;
if (pitch > 0)
bits += (ras.target.rows-1)*pitch;
if ( x >= 0 && x < ras.target.rows )
bits[0] |= f1;
}
/***********************************************************************/
/* */
/* <Function> Horizontal_Sweep_Step */
/* */
/* <Description> */
/* Called whenever the sweep jumps to another pixel column. */
/* */
/***********************************************************************/
static void Horizontal_Sweep_Step( RAS_ARG )
{
/* Nothing, really */
UNUSED_RASTER;
}
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/******** *********/
/******** Anti-Aliased Vertical Bitmap Sweep Routines *********/
/******** *********/
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
#ifdef FT_RASTER_OPTION_ANTI_ALIAS
#ifdef FT_RASTER_ANTI_ALIAS_5
/***********************************************************************/
/* */
/* Vertical Gray Sweep Procedure Set : */
/* */
/* These two routines are used during the vertical gray-levels */
/* sweep phase by the generic Draw_Sweep() function. */
/* */
/* */
/* NOTES: */
/* */
/* - The target pixmap's width *must* be a multiple of 4. */
/* */
/* - you have to use the function Vertical_Sweep_Span() for */
/* the gray span call. */
/* */
/***********************************************************************/
static
const Word32 LMask5[17] =
{ 0xF0F0F0F0, 0xF0F0F070, 0xF0F0F030, 0xF0F0F010,
0xF0F0F000, 0xF0F07000, 0xF0F03000, 0xF0F01000,
0xF0F00000, 0xF0700000, 0xF0300000, 0xF0100000,
0xF0000000, 0x70000000, 0x30000000, 0x10000000,
0x00000000 };
static
const Word32 LPos5[17] =
{ 0x80000000, 0x40000000, 0x20000000, 0x10000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000,
0x00008000, 0x00004000, 0x00002000, 0x00001000,
0x00000080, 0x00000040, 0x00000020, 0x00000010 };
static void Vertical_Gray5_Sweep_Init( RAS_ARGS int* min, int* max )
{
long pitch;
*min = *min & -2;
*max = ( *max+3 ) & -2;
ras.trace_bit = 0;
pitch = ras.target.pitch;
ras.trace_incr = -pitch;
ras.trace_pix = - (*min/2)*pitch;
if (pitch > 0)
ras.trace_pix += (ras.target.rows-1)*pitch;
ras.gray_min_x = 32000;
ras.gray_max_x = -32000;
}
static void Vertical_Gray5_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
TPos e1, e2;
int c1, c2;
TByte* target;
unsigned int f1, f2;
unsigned int shift, fill;
/* Drop-out control */
e1 = TRUNC( CEILING( x1 ) );
if ( x2-x1 <= ras.precision+ras.precision_jitter )
e2 = e1;
else
e2 = FLOOR ( x2 );
e2 = TRUNC( e2 );
if ( e1 <= e2 && e2 >= 0 && e1 < ras.bit_width )
{
if ( e1 < 0 ) e1 = 0;
if ( e2 >= ras.bit_width ) e2 = ras.bit_width-1;
shift = (y & 1)*4;
c1 = e1 >> 4;
c2 = e2 >> 4;
fill = LMask5[0];
f1 = LMask5[ e1 & 15 ];
f2 = fill ^ LMask5[ 1+(e2 & 15) ];
f1 >>= shift;
f2 >>= shift;
fill >>= shift;
if ( ras.gray_min_x > c1 ) ras.gray_min_x = c1;
if ( ras.gray_max_x < c2 ) ras.gray_max_x = c2;
target = ras.bit_buffer + c1*4;
c2 -= c1;
if (c2 > 0)
{
Word32* slice = (Word32*)target;
slice[0] |= f1;
c2--;
while (c2 > 0)
{
* ++slice |= fill;
c2--;
}
slice[1] |= f2;
}
else
((Word32*)target)[0] |= ( f1 & f2 );
}
}
static
int Vertical_Gray5_Test_Pixel( RAS_ARGS int y,
int x )
{
int c1 = x >> 4;
Word32 mask = LPos5[ x & 15 ] >> ((y & 1)*4);
(void)y;
return ( x >= 0 &&
x < ras.bit_width &&
((Word32*)ras.bit_buffer + c1)[0] & mask );
}
static
void Vertical_Gray5_Set_Pixel( RAS_ARGS int y,
int x,
int color )
{
(void)color; /* unused here */
(void)y;
if ( x >= 0 && x < ras.bit_width )
{
int c1 = x >> 4;
Word32 mask = LPos5[ x & 15 ] >> ((y & 1)*4);
if ( ras.gray_min_x > c1 ) ras.gray_min_x = c1;
if ( ras.gray_max_x < c1 ) ras.gray_max_x = c1;
((Word32*)ras.bit_buffer + c1)[0] |= mask;
}
}
static void Vertical_Gray5_Sweep_Step( RAS_ARG )
{
int c1;
PByte pix, bit;
int* count = ras.count_table;
long* grays;
ras.trace_bit++;
if ( ras.trace_bit > 1 )
{
pix = ras.pix_buffer + ras.trace_pix + ras.gray_min_x*8;
grays = ras.grays;
if ( ras.gray_max_x >= 0 )
{
if ( ras.gray_max_x*8 >= ras.target.width )
ras.gray_max_x = (ras.target.width+7)/8-1;
if ( ras.gray_min_x < 0 )
ras.gray_min_x = 0;
bit = ras.bit_buffer + ras.gray_min_x*4;
c1 = (ras.gray_max_x - ras.gray_min_x + 1);
while ( c1 >= 0 )
{
if ( *(short*)bit )
{
#if defined( FT_RASTER_LITTLE_ENDIAN )
/* little endian storage */
*((long*)pix) = (count[bit[1]] << 16) | count[bit[0]];
#elif defined( FT_RASTER_BIG_ENDIAN )
/* big-endian storage */
*((long*)pix) = (count[bit[0]] << 16) | count[bit[1]];
#else
/* endian-independent storage */
int c;
c = count[bit[1]];
pix[4] = (TByte)(c >> 8);
pix[5] = (TByte)(c & 0xFF);
c = count[bit[0]];
pix[6] = (TByte)(c >> 8);
pix[7] = (TByte)(c & 0xFF);
#endif
*(short*)bit = 0;
}
bit += 2;
if ( *(short*)bit )
{
#if defined( FT_RASTER_LITTLE_ENDIAN )
/* little endian storage */
*((long*)pix + 1)= (count[bit[1]] << 16) | count[bit[0]];
#elif defined( FT_RASTER_BIG_ENDIAN )
/* big-endian storage */
*((long*)pix + 1) = (count[bit[0]] << 16) | count[bit[1]];
#else
/* endian-independent storage */
int c;
c = count[bit[1]];
pix[0] = (TByte)(c >> 8);
pix[1] = (TByte)(c & 0xFF);
c = count[bit[0]];
pix[2] = (TByte)(c >> 8);
pix[3] = (TByte)(c & 0xFF);
#endif
*(short*)bit = 0;
}
pix += 8;
bit += 2;
c1 --;
}
}
ras.trace_bit = 0;
ras.trace_pix += ras.trace_incr;
ras.gray_min_x = 32000;
ras.gray_max_x = -32000;
}
}
static void Horizontal_Gray5_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
/* nothing, really */
UNUSED_RASTER
(void)y;
(void)x1;
(void)x2;
}
static
int Horizontal_Gray5_Test_Pixel( RAS_ARGS TScan y,
int x )
{
/* don't do anything here */
UNUSED_RASTER
(void)x;
(void)y;
return 0;
}
static
void Horizontal_Gray5_Set_Pixel( RAS_ARGS TScan y,
int x,
int color )
{
char* pixel;
x = x/2;
if (x < ras.target.rows)
{
long pitch;
pixel = (char*)ras.pix_buffer + (y/2);
pitch = ras.target.pitch;
pixel -= x*pitch;
if (pitch > 0)
pixel += (ras.target.rows-1)*pitch;
if (pixel[0] == ras.grays[0])
pixel[0] = (char)ras.grays[1+color];
}
}
#endif /* FT_RASTER_ANTI_ALIAS_5 */
#ifdef FT_RASTER_ANTI_ALIAS_17
/***********************************************************************/
/* */
/* Vertical Gray Sweep Procedure Set : */
/* */
/* These two routines are used during the vertical gray-levels */
/* sweep phase by the generic Draw_Sweep() function. */
/* */
/* */
/* NOTES: */
/* */
/* - The target pixmap's width *must* be a multiple of 4. */
/* */
/* - you have to use the function Vertical_Sweep_Span() for */
/* the gray span call. */
/* */
/***********************************************************************/
static void Vertical_Gray17_Sweep_Init( RAS_ARGS int* min, int* max )
{
long pitch = ras.target.pitch;
*min = *min & -4;
*max = ( *max+7 ) & -4;
ras.trace_bit = 0;
ras.trace_incr = -pitch;
ras.trace_bit = - (*min/4)*pitch;
if (pitch > 0)
ras.trace_bit += (ras.target.rows-1)*pitch;
ras.gray_min_x = 32000;
ras.gray_max_x = -32000;
}
static void Vertical_Gray17_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
static
const unsigned int LMask[9] =
#ifdef FT_RASTER_LITTLE_ENDIAN
{ 0xF000F000, 0xF0007000, 0xF0003000, 0xF0001000,
0xF0000000, 0x70000000, 0x30000000, 0x10000000,
0x00000000 };
#else
{ 0xF000F000, 0x7000F000, 0x3000F000, 0x1000F000,
0x0000F000, 0x00007000, 0x00003000, 0x00001000,
0x00000000 };
#endif
TPos e1, e2;
int c1, c2;
TByte* target;
unsigned int f1, f2;
unsigned int shift, fill;
/* Drop-out control */
e1 = TRUNC( CEILING( x1 ) );
if ( x2-x1 <= ras.precision+ras.precision_jitter )
e2 = e1;
else
e2 = FLOOR ( x2 );
e2 = TRUNC( e2 );
if ( e1 <= e2 && e2 >= 0 && e1 < ras.bit_width )
{
if ( e1 < 0 ) e1 = 0;
if ( e2 >= ras.bit_width ) e2 = ras.bit_width-1;
shift = (y & 3)*4;
c1 = e1 >> 3;
c2 = e2 >> 3;
fill = LMask[0];
f1 = LMask[ e1 & 7 ];
f2 = fill ^ LMask[ 1+(e2 & 7) ];
f1 >>= shift;
f2 >>= shift;
fill >>= shift;
if ( ras.gray_min_x > c1/2 ) ras.gray_min_x = c1/2;
if ( ras.gray_max_x < c2/2 ) ras.gray_max_x = c2/2;
target = ras.bit_buffer + c1*4;
c2 -= c1;
if (c2 > 0)
{
int* slice = (int*)target;
slice[0] |= f1;
c2--;
while (c2 > 0)
{
* ++slice |= fill;
c2--;
}
slice[1] |= f2;
}
else
((int*)target)[0] |= ( f1 & f2 );
}
}
static
int Vertical_Gray17_Test_Pixel( RAS_ARGS int y,
int x )
{
int c1 = x >> 2;
int f1 = x & 3;
int mask = (0x8000 >> f1) >> ((y & 3)*4);
return ( x >= 0 &&
x < ras.bit_width &&
((short*)ras.bit_buffer)[c1] & mask );
}
static
void Vertical_Gray17_Set_Pixel( RAS_ARGS int y,
int x,
int color )
{
(void)color; /* unused here */
if ( x >= 0 && x < ras.bit_width )
{
int c1 = x >> 2;
int f1 = x & 3;
int mask = (0x8000 >> f1) >> ((y & 3)*4);
if ( ras.gray_min_x > c1/4 ) ras.gray_min_x = c1/4;
if ( ras.gray_max_x < c1/4 ) ras.gray_max_x = c1/4;
((short*)ras.bit_buffer)[c1] |= mask;
}
}
static void Vertical_Gray17_Sweep_Step( RAS_ARG )
{
int c1;
PByte pix, bit;
long* grays;
ras.trace_bit++;
if ( ras.trace_bit > 3 )
{
pix = ras.pix_buffer + ras.trace_pix + ras.gray_min_x*4;
grays = ras.grays;
if ( ras.gray_max_x >= 0 )
{
if ( ras.gray_max_x >= ras.target.width/4 )
ras.gray_max_x = (ras.target.width+3)/4-1;
if ( ras.gray_min_x < 0 )
ras.gray_min_x = 0;
bit = ras.bit_buffer + ras.gray_min_x*8;
c1 = (ras.gray_max_x - ras.gray_min_x + 1);
while ( c1 >= 0 )
{
if ( *(long*)bit || *(long*)(bit+4) )
{
int* table = ras.count_table;
#if defined( FT_RASTER_LITTLE_ENDIAN )
/* little-endian specific storage */
*(long*)pix = grays[ table[ bit[0] ] +
table[ bit[1] ] ] |
( grays[ table[ bit[2] ] +
table[ bit[3] ] ] << 8 ) |
( grays[ table[ bit[4] ] +
table[ bit[5] ] ] << 16 ) |
( grays[ table[ bit[6] ] +
table[ bit[7] ] ] << 24 );
#elif defined( FT_RASTER_BIG_ENDIAN )
/* big-endian specific storage */
*(long*)pix = ( grays[ table[ bit[0] ] +
table[ bit[1] ] ] << 24 |
( grays[ table[ bit[2] ] +
table[ bit[3] ] ] << 16 ) |
( grays[ table[ bit[4] ] +
table[ bit[5] ] ] << 8 ) |
( grays[ table[ bit[6] ] +
table[ bit[7] ] ] );
#else
/* endianess-independent storage */
pix[0] = grays[ table[bit[0]] + table[bit[1]] ];
pix[1] = grays[ table[bit[2]] + table[bit[3]] ];
pix[2] = grays[ table[bit[4]] + table[bit[5]] ];
pix[3] = grays[ table[bit[6]] + table[bit[7]] ];
#endif
*(long*)( bit ) = 0;
*(long*)(bit+4) = 0;
}
pix += 4;
bit += 8;
c1 --;
}
}
ras.trace_bit = 0;
ras.trace_pix += ras.trace_incr;
ras.gray_min_x = 32000;
ras.gray_max_x = -32000;
}
}
static void Horizontal_Gray17_Sweep_Span( RAS_ARGS TScan y,
TPos x1,
TPos x2 )
{
/* nothing, really */
UNUSED_RASTER
(void)y;
(void)x1;
(void)x2;
}
static
int Horizontal_Gray17_Test_Pixel( RAS_ARGS TScan y,
int x )
{
/* don't do anything here */
UNUSED_RASTER
(void)x;
(void)y;
return 0;
}
static
void Horizontal_Gray17_Set_Pixel( RAS_ARGS TScan y,
int x,
int color )
{
char* pixel;
x = x/4;
if (x < ras.target.rows)
{
long pitch = ras.target.pitch;
pixel = (char*)ras.pix_buffer + (y/4);
pixel -= x*pitch;
if (pitch > 0)
pixel += (ras.target.rows-1)*pitch;
if (pixel[0] == ras.grays[0])
pixel[0] = ras.grays[1+color];
}
}
#endif /* FT_RASTER_ANTI_ALIAS_17 */
#endif /* FT_RASTER_OPTION_ANTI_ALIAS */
/********************************************************************/
/* */
/* Generic Sweep Drawing routine */
/* */
/********************************************************************/
static TBool Draw_Sweep( RAS_ARG )
{
TScan y, y_change, y_height;
PProfile P, Q, P_Left, P_Right;
TScan min_Y, max_Y, top, bottom, dropouts;
TPos x1, x2, e1, e2;
TProfileList wait;
TProfileList draw;
/* Init empty linked lists */
Init_Linked( &wait );
Init_Linked( &draw );
/* first, compute min and max Y */
P = ras.start_prof;
max_Y = TRUNC( ras.minY );
min_Y = TRUNC( ras.maxY );
while ( P )
{
Q = P->link;
bottom = P->start;
top = P->start + P->height-1;
if ( min_Y > bottom ) min_Y = bottom;
if ( max_Y < top ) max_Y = top;
P->X = 0;
InsNew( &wait, P );
P = Q;
}
/* Check the Y-turns */
if ( ras.n_turns == 0 )
{
ras.error = ErrRaster_Invalid_Outline;
return FAILURE;
}
/* Now inits the sweep */
ras.Proc_Sweep_Init( RAS_VARS &min_Y, &max_Y );
/* Then compute the distance of each profile from min_Y */
P = wait;
while ( P )
{
P->countL = P->start - min_Y;
P = P->link;
}
/* Let's go */
y = min_Y;
y_height = 0;
if ( ras.n_turns > 0 &&
ras.pool_size[-ras.n_turns] == min_Y )
ras.n_turns--;
while (ras.n_turns > 0)
{
PProfile prof = wait;
/* look in the wait list for new activations */
while (prof)
{
PProfile next = prof->link;
prof->countL -= y_height;
if ( prof->countL == 0 )
{
DelOld( &wait, prof );
InsNew( &draw, prof );
}
prof = next;
}
/* Sort the drawing lists */
Sort( &draw );
y_change = ras.pool_size[-ras.n_turns--];
y_height = y_change - y;
while ( y < y_change )
{
int window;
PProfile left;
/* Let's trace */
dropouts = 0;
if (!draw)
goto Next_Line;
left = draw;
window = left->flow;
prof = left->link;
while (prof)
{
PProfile next = prof->link;
window += prof->flow;
if ( window == 0 )
{
x1 = left->X;
x2 = prof->X;
#if 1
if ( x1 > x2 )
{
TPos xs = x1;
x1 = x2;
x2 = xs;
}
#endif
if ( x2-x1 <= ras.precision && ras.dropout_mode )
{
#if 1
e1 = CEILING( x1 );
e2 = FLOOR( x2 );
#else
e1 = FLOOR(x1);
e2 = CEILING(x2);
#endif
if ( e1 > e2 || e2 == e1+ ras.precision )
{
/* a drop out was detected */
left->X = x1;
prof->X = x2;
/* mark profiles for drop-out processing */
left->countL = 1;
prof->countL = 2;
dropouts++;
goto Skip_To_Next;
}
}
ras.Proc_Sweep_Span( RAS_VARS y, x1, x2 );
Skip_To_Next:
left = next;
}
prof = next;
}
/* now perform the dropouts _after_ the span drawing */
/* drop-outs processing has been moved out of the loop */
/* for performance tuning */
if (dropouts > 0)
goto Scan_DropOuts;
Next_Line:
ras.Proc_Sweep_Step( RAS_VAR );
y++;
if ( y < y_change )
Sort( &draw );
}
/* Now finalize the profiles that needs it */
{
PProfile prof, next;
prof = draw;
while (prof)
{
next = prof->link;
if (prof->height == 0)
DelOld( &draw, prof );
prof = next;
}
}
}
/* for gray-scaling, flushes the bitmap scanline cache */
while (y <= max_Y)
{
ras.Proc_Sweep_Step( RAS_VAR );
y++;
}
return SUCCESS;
Scan_DropOuts :
P_Left = draw;
while (dropouts > 0)
{
TPos e1, e2;
PProfile left, right;
while (P_Left->countL != 1) P_Left = P_Left->link;
P_Right = P_Left->link;
while (P_Right->countL != 2) P_Right = P_Right->link;
P_Left->countL = 0;
P_Right->countL = 0;
/* Now perform the dropout control */
x1 = P_Left->X;
x2 = P_Right->X;
left = ( ras.flipped ? P_Right : P_Left );
right = ( ras.flipped ? P_Left : P_Right );
e1 = CEILING( x1 );
e2 = FLOOR ( x2 );
if ( e1 > e2 )
{
if ( e1 == e2 + ras.precision )
{
switch ( ras.dropout_mode )
{
case 1:
e1 = e2;
break;
case 4:
e1 = CEILING( (x1+x2+1) / 2 );
break;
case 2:
case 5:
/* Drop-out Control Rule #4 */
/* The spec is not very clear regarding rule #4. It */
/* presents a method that is way too costly to implement */
/* while the general idea seems to get rid of 'stubs'. */
/* */
/* Here, we only get rid of stubs recognized when: */
/* */
/* upper stub: */
/* */
/* - P_Left and P_Right are in the same contour */
/* - P_Right is the successor of P_Left in that contour */
/* - y is the top of P_Left and P_Right */
/* */
/* lower stub: */
/* */
/* - P_Left and P_Right are in the same contour */
/* - P_Left is the successor of P_Right in that contour */
/* - y is the bottom of P_Left */
/* */
/* upper stub test */
if ( ( left->next == right && left->height <= 0 ) ||
/* lower stub test */
( right->next == left && left->start == y ) ||
/* check that the rightmost pixel isn't set */
ras.Proc_Test_Pixel( RAS_VARS y, TRUNC(e1)) )
goto Next_Dropout;
if ( ras.dropout_mode == 2 )
e1 = e2;
else
e1 = CEILING( (x1+x2+1)/2 );
break;
default:
goto Next_Dropout; /* Unsupported mode */
}
}
else
goto Next_Dropout;
}
ras.Proc_Set_Pixel( RAS_VARS y,
TRUNC(e1),
(x2-x1 >= ras.precision_half) & 1 );
Next_Dropout:
dropouts--;
}
goto Next_Line;
}
/****************************************************************************/
/* */
/* Function: Render_Single_Pass */
/* */
/* Description: Performs one sweep with sub-banding. */
/* */
/* Input: _XCoord, _YCoord : x and y coordinates arrays */
/* */
/* Returns: SUCCESS on success */
/* FAILURE if any error was encountered during render. */
/* */
/****************************************************************************/
static
int Render_Single_Pass( RAS_ARGS int flipped )
{
int i, j, k;
ras.flipped = flipped;
while ( ras.band_top >= 0 )
{
#if 1
ras.maxY = (long)ras.band_stack[ras.band_top].y_max * ras.precision;
ras.minY = (long)ras.band_stack[ras.band_top].y_min * ras.precision;
#else
ras.maxY = ((long)ras.band_stack[ras.band_top].y_max <<
(ras.scale_shift+6))-1;
ras.minY = (long)ras.band_stack[ras.band_top].y_min <<
(ras.scale_shift+6);
#endif
ras.cursor = ras.pool;
ras.error = 0;
if ( Convert_Glyph( RAS_VARS ras.outline ) )
{
if ( ras.error != ErrRaster_Overflow ) return FAILURE;
ras.error = ErrRaster_Ok;
/* sub-banding */
#ifdef DEBUG_RASTER
ClearBand( RAS_VARS TRUNC( ras.minY ), TRUNC( ras.maxY ) );
#endif
i = ras.band_stack[ras.band_top].y_min;
j = ras.band_stack[ras.band_top].y_max;
k = ( j-i ) >> 1;
if ( ras.band_top >= 7 || k == 0 )
{
ras.band_top = 0;
ras.error = ErrRaster_Invalid_Outline;
return ras.error;
}
ras.band_stack[ras.band_top+1].y_min = i + k;
ras.band_stack[ras.band_top+1].y_max = j;
ras.band_stack[ras.band_top].y_max = i + k;
ras.band_top++;
}
else
{
if ( ras.start_prof )
if ( Draw_Sweep( RAS_VAR ) ) return ras.error;
ras.band_top--;
}
}
return 0; /* success */
}
#if 0
void Compute_BBox( FT_Outline* outline,
FT_BBox* bbox )
{
int n;
FT_Vector* vec;
vec = outline->points;
bbox->xMin = bbox->xMax = vec->x;
bbox->yMin = bbox->yMax = vec->y;
n = outline->n_points-1;
while ( n > 0 )
{
FT_Pos x, y;
vec++;
x = vec->x;
if ( bbox->xMin > x ) bbox->xMin = x;
if ( bbox->xMax < x ) bbox->xMax = x;
y = vec->y;
if ( bbox->yMin > y ) bbox->yMin = y;
if ( bbox->yMax < y ) bbox->yMax = y;
n--;
}
}
#endif
static
int Raster_Render1( FT_Raster raster )
{
int error;
long byte_len;
byte_len = ras.target.pitch;
if (byte_len < 0) byte_len = -byte_len;
if ( ras.target.width > byte_len*8 )
return ErrRaster_Invalid_Map;
ras.scale_shift = (ras.precision_bits-6);
/* Vertical Sweep */
ras.band_top = 0;
ras.band_stack[0].y_min = 0;
ras.band_stack[0].y_max = ras.target.rows - 1;
ras.Proc_Sweep_Init = Vertical_Sweep_Init;
ras.Proc_Sweep_Span = Vertical_Sweep_Span;
ras.Proc_Sweep_Step = Vertical_Sweep_Step;
ras.Proc_Test_Pixel = Vertical_Test_Pixel;
ras.Proc_Set_Pixel = Vertical_Set_Pixel;
ras.bit_width = ras.target.width;
ras.bit_buffer = (unsigned char*)ras.target.buffer;
if ( (error = Render_Single_Pass( RAS_VARS 0 )) != 0 )
return error;
/* Horizontal Sweep */
if ( ras.second_pass && ras.dropout_mode != 0 )
{
ras.Proc_Sweep_Init = Horizontal_Sweep_Init;
ras.Proc_Sweep_Span = Horizontal_Sweep_Span;
ras.Proc_Sweep_Step = Horizontal_Sweep_Step;
ras.Proc_Test_Pixel = Horizontal_Test_Pixel;
ras.Proc_Set_Pixel = Horizontal_Set_Pixel;
ras.band_top = 0;
ras.band_stack[0].y_min = 0;
ras.band_stack[0].y_max = ras.target.width - 1;
if ( (error = Render_Single_Pass( RAS_VARS 1 )) != 0 )
return error;
}
return ErrRaster_Ok;
}
#ifdef FT_RASTER_OPTION_ANTI_ALIAS
static
int Raster_Render8( FT_Raster raster )
{
int error;
long byte_len;
byte_len = ras.target.pitch;
if (byte_len < 0) byte_len = -byte_len;
if ( ras.target.width > byte_len )
return ErrRaster_Invalid_Map;
/* Vertical Sweep */
ras.band_top = 0;
ras.band_stack[0].y_min = 0;
ras.band_stack[0].y_max = ras.target.rows;
#if !defined(FT_RASTER_ANTI_ALIAS_5) && !defined(FT_RASTER_ANTI_ALIAS_17)
return ErrRaster_Unimplemented;
#endif
#ifdef FT_RASTER_ANTI_ALIAS_5
if ( ras.grays_count == 5 )
{
ras.scale_shift = (ras.precision_bits-5);
ras.bit_width = ras.gray_width/2;
if ( ras.bit_width > (ras.target.width+3)/4 )
ras.bit_width = (ras.target.width+3)/4;
ras.bit_width = ras.bit_width * 8;
ras.bit_buffer = (unsigned char*)ras.gray_lines;
ras.pix_buffer = (unsigned char*)ras.target.buffer;
ras.Proc_Sweep_Init = Vertical_Gray5_Sweep_Init;
ras.Proc_Sweep_Span = Vertical_Gray5_Sweep_Span;
ras.Proc_Sweep_Step = Vertical_Gray5_Sweep_Step;
ras.Proc_Test_Pixel = Vertical_Gray5_Test_Pixel;
ras.Proc_Set_Pixel = Vertical_Gray5_Set_Pixel;
}
#endif
#ifdef FT_RASTER_ANTI_ALIAS_17
if ( ras.grays_count == 17 )
{
ras.scale_shift = (ras.precision_bits-4);
ras.bit_width = ras.gray_width/4;
if ( ras.bit_width > (ras.target.width+1)/2 )
ras.bit_width = (ras.target.width+1)/2;
ras.bit_width = ras.bit_width * 8;
ras.bit_buffer = (unsigned char*)ras.gray_lines;
ras.pix_buffer = (unsigned char*)ras.target.buffer;
ras.Proc_Sweep_Init = Vertical_Gray17_Sweep_Init;
ras.Proc_Sweep_Span = Vertical_Gray17_Sweep_Span;
ras.Proc_Sweep_Step = Vertical_Gray17_Sweep_Step;
ras.Proc_Test_Pixel = Vertical_Gray17_Test_Pixel;
ras.Proc_Set_Pixel = Vertical_Gray17_Set_Pixel;
}
#endif
error = Render_Single_Pass( RAS_VARS 0 );
if (error)
return error;
/* Horizontal Sweep */
if ( ras.second_pass && ras.dropout_mode != 0 )
{
#ifdef FT_RASTER_ANTI_ALIAS_5
if ( ras.grays_count == 5 )
{
ras.Proc_Sweep_Init = Horizontal_Sweep_Init;
ras.Proc_Sweep_Span = Horizontal_Gray5_Sweep_Span;
ras.Proc_Sweep_Step = Horizontal_Sweep_Step;
ras.Proc_Test_Pixel = Horizontal_Gray5_Test_Pixel;
ras.Proc_Set_Pixel = Horizontal_Gray5_Set_Pixel;
}
#endif
#ifdef FT_RASTER_ANTI_ALIAS_17
if ( ras.grays_count == 17 )
{
ras.Proc_Sweep_Init = Horizontal_Sweep_Init;
ras.Proc_Sweep_Span = Horizontal_Gray17_Sweep_Span;
ras.Proc_Sweep_Step = Horizontal_Sweep_Step;
ras.Proc_Test_Pixel = Horizontal_Gray17_Test_Pixel;
ras.Proc_Set_Pixel = Horizontal_Gray17_Set_Pixel;
}
#endif
ras.band_top = 0;
ras.band_stack[0].y_min = 0;
ras.band_stack[0].y_max = ras.target.width-1;
error = Render_Single_Pass( RAS_VARS 1 );
if (error)
return error;
}
return ErrRaster_Ok;
}
#else /* ANTI_ALIAS */
static
int Raster_Render8( FT_Raster raster )
{
UNUSED_RASTER
return ErrRaster_Unimplemented;
}
#endif /* FT_RASTER_OPTION_ANTI_ALIAS */
#ifdef FT_RASTER_OPTION_ANTI_ALIAS
/****************************************************************************/
/* */
/* <Function> Reset_Palette_5 */
/* */
/* <Description> Resets lookup table when the 5-gray-levels palette changes */
/* */
/****************************************************************************/
static
void Reset_Palette_5( RAS_ARG )
{
int i;
for ( i = 0; i < 256; i++ )
{
int cnt1, cnt2;
cnt1 = ((i & 128) >> 7) +
((i & 64) >> 6) +
((i & 8) >> 3) +
((i & 4) >> 2);
cnt2 = ((i & 32) >> 5) +
((i & 16) >> 4) +
((i & 2) >> 1) +
(i & 1);
/* */
/* Note that when the endianess isn't specified through one of the */
/* configuration, we use the big-endian storage in 'count_table' */
/* */
#if defined( FT_RASTER_LITTLE_ENDIAN )
ras.count_table[i] = (ras.grays[cnt2] << 8) | ras.grays[cnt1];
#else
ras.count_table[i] = (ras.grays[cnt1] << 8) | ras.grays[cnt2];
#endif
}
}
/****************************************************************************/
/* */
/* <Function> Reset_Palette_17 */
/* */
/* <Description> Resets lookup table when 17-gray-levels palette changes */
/* */
/****************************************************************************/
#ifdef FT_RASTER_ANTI_ALIAS_17
static
void Reset_Palette_17( RAS_ARG )
{
int i;
for ( i = 0; i < 256; i++ )
ras.count_table[i] =
((i & 128) >> 7) +
((i & 64) >> 6) +
((i & 8) >> 3) +
((i & 4) >> 2) +
((i & 32) >> 5) +
((i & 16) >> 4) +
((i & 2) >> 1) +
(i & 1);
}
#endif /* ANTI_ALIAS_17 */
#endif /* TT_RASTER_OPTION_ANTI_ALIAS */
/**********************************************************************/
/* */
/* <Function> FT_Raster_SetPalette */
/* */
/* <Description> */
/* Set the pixmap rendering palette. anti-aliasing modes are */
/* implemented/possible, they differ from the number of */
/* entries in the palette. */
/* */
/* <Input> */
/* count :: the number of palette entries. Valid values are */
/* 2, 5 and 17, which are the number of intermediate */
/* gray levels supported */
/* */
/* palette :: an array of 'count' chars giving the 8-bit palette */
/* of intermediate "gray" levels for anti-aliased */
/* rendering. */
/* */
/* In all modes, palette[0] corresponds to the background, */
/* while palette[count-1] to the foreground. Hence, a count */
/* of 2 corresponds to no anti-aliasing; a count of 5 uses */
/* 3 intermediate levels between the background and */
/* foreground, while a count of 17 uses 15 of them.. */
/* */
/* <Return> */
/* An error code, used as a FT_Error by the FreeType library. */
/* */
/* <Note> */
/* By default, a new object uses mode 5, with a palette of */
/* 0,1,2,3 and 4. You don't need to set the palette if you */
/* don't need to render pixmaps.. */
/* */
/**********************************************************************/
EXPORT_FUNC
int FT_Raster_SetPalette( FT_Raster raster,
int count,
const char* palette )
{
(void)raster;
(void)palette;
switch (count)
{
#ifdef FT_RASTER_OPTION_ANTI_ALIAS
/******************************/
/* The case of 17 gray levels */
/******************************/
case 17:
#ifdef FT_RASTER_ANTI_ALIAS_17
{
int n;
raster->grays_count = count;
for ( n = 0; n < count; n++ )
raster->grays[n] = (unsigned char)palette[n];
Reset_Palette_17( RAS_VAR );
break;
}
#else
return ErrRaster_Unimplemented;
#endif
/*****************************/
/* The case of 5 gray levels */
/*****************************/
case 5:
#ifdef FT_RASTER_ANTI_ALIAS_5
{
int n;
raster->grays_count = count;
for ( n = 0; n < count; n++ )
raster->grays[n] = (unsigned char)palette[n];
Reset_Palette_5( RAS_VAR );
break;
}
#else
return ErrRaster_Unimplemented;
#endif
#endif /* FT_RASTER_OPTION_ANTI_ALIAS */
default:
return ErrRaster_Bad_Palette_Count;
}
return ErrRaster_Ok;
}
/**** RASTER OBJECT CREATION : in standalone mode, we simply use *****/
/**** a static object .. *****/
#ifdef _STANDALONE_
static
int ft_black2_new( void* memory, FT_Raster *araster )
{
static FT_RasterRec_ the_raster;
*araster = &the_raster;
memset( &the_raster, sizeof(the_raster), 0 );
return 0;
}
static
void ft_black2_done( FT_Raster raster )
{
/* nothing */
raster->init = 0;
}
#else
#include <freetype/internal/ftobjs.h>
static
int ft_black2_new( FT_Memory memory, FT_Raster *araster )
{
FT_Error error;
FT_Raster raster;
*araster = 0;
if ( !ALLOC( raster, sizeof(*raster) ))
{
raster->memory = memory;
*araster = raster;
}
return error;
}
static
void ft_black2_done( FT_Raster raster )
{
FT_Memory memory = (FT_Memory)raster->memory;
FREE( raster );
}
#endif
static void ft_black2_reset( FT_Raster raster,
const char* pool_base,
long pool_size )
{
static const char default_palette[5] = { 0, 1, 2, 3, 4 };
/* check the object address */
if ( !raster )
return;
/* check the render pool - we won't go under 4 Kb */
if ( !pool_base || pool_size < 4096 )
return;
/* save the pool */
raster->pool = (PPos)pool_base;
raster->pool_size = (PPos)(pool_base + (pool_size & -8));
#ifdef FT_RASTER_OPTION_ANTI_ALIAS
raster->gray_width = ANTI_ALIAS_BUFFER_SIZE/2;
/* clear anti-alias intermediate lines */
{
char* p = raster->gray_lines;
int size = ANTI_ALIAS_BUFFER_SIZE;
do
{
*p++ = 0;
size--;
} while (size > 0);
}
#endif
/* set the default palette : 5 levels = 0, 1, 2, 3 and 4 */
FT_Raster_SetPalette( raster, 5, default_palette );
}
static
int ft_black2_render( FT_Raster raster,
FT_Raster_Params* params )
{
FT_Outline* outline = (FT_Outline*)params->source;
FT_Bitmap* target_map = params->target;
if ( !raster || !raster->pool || !raster->pool_size )
return ErrRaster_Uninitialised_Object;
if ( !outline || !outline->contours || !outline->points )
return ErrRaster_Invalid_Outline;
/* return immediately if the outline is empty */
if ( outline->n_points == 0 || outline->n_contours <= 0 )
return ErrRaster_Invalid_Outline;
if ( outline->n_points != outline->contours[outline->n_contours - 1] + 1 )
return ErrRaster_Invalid_Outline;
if ( !target_map || !target_map->buffer )
return ErrRaster_Invalid_Map;
/* this version of the raster does not support direct rendering, sorry */
if ( params->flags & ft_raster_flag_direct )
return ErrRaster_Unimplemented;
ras.outline = outline;
ras.target = *target_map;
ras.dropout_mode = 2;
ras.second_pass = !(outline->flags & ft_outline_single_pass);
SET_High_Precision( (outline->flags & ft_outline_high_precision) );
return ( params->flags & ft_raster_flag_aa
? Raster_Render8(raster)
: Raster_Render1(raster) );
}
FT_Raster_Funcs ft_black2_raster =
{
ft_glyph_format_outline,
(FT_Raster_New_Func) ft_black2_new,
(FT_Raster_Reset_Func) ft_black2_reset,
(FT_Raster_Set_Mode_Func) 0,
(FT_Raster_Render_Func) ft_black2_render,
(FT_Raster_Done_Func) ft_black2_done
};
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