Commit 4fce93e0cb5294786c482c8cbb9233070349686f
2000-05-03T18:15:40
still working on that damn rasterizer bug !! ;-)
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diff --git a/demos/Makefile b/demos/Makefile
index 5a1b905..3a69279 100644
--- a/demos/Makefile
+++ b/demos/Makefile
@@ -190,6 +190,9 @@ else
$(OBJ_)ftrast.$O: $(SRC_DIR_)ftrast.c
$(COMPILE) $T$@ $<
+ $(OBJ_)ftrast2.$O: $(SRC_DIR_)ftrast2.c
+ $(COMPILE) $T$@ $<
+
$(OBJ_)fttry.$O: $(SRC_DIR_)fttry.c
$(COMPILE) $T$@ $<
@@ -264,8 +267,8 @@ else
$(LINK)
- $(BIN_)ftview$E: $(OBJ_)ftview.$O $(FTLIB) $(GRAPH_LIB) $(COMMON_OBJ) $(OBJ_)ftrast.$O
- $(GRAPH_LINK)
+ $(BIN_)ftview$E: $(OBJ_)ftview.$O $(FTLIB) $(GRAPH_LIB) $(COMMON_OBJ) $(OBJ_)ftrast2.$O
+ $(GRAPH_LINK) $(OBJ_)ftrast2.$O
$(BIN_)ftstring$E: $(OBJ_)ftstring.$O $(FTLIB) $(GRAPH_LIB) $(COMMON_OBJ)
$(GRAPH_LINK)
diff --git a/demos/src/ftrast.c b/demos/src/ftrast.c
index 07c8df4..6f86a72 100644
--- a/demos/src/ftrast.c
+++ b/demos/src/ftrast.c
@@ -23,6 +23,75 @@
#include "ftrast.h"
#include <ftcalc.h> /* for FT_MulDiv only */
+ /*************************************************************************/
+ /* */
+ /* A simple technical note on how the raster works: */
+ /* */
+ /* Converting an outline into a bitmap is achieved in several steps */
+ /* which are: */
+ /* */
+ /* 1 - Decomposing the outline into successive `profiles'. Each */
+ /* profile is simply an array of scanline intersections on a given */
+ /* dimension. A profile's main attributes are */
+ /* */
+ /* o its scanline position boundaries, i.e. `Ymin' and `Ymax'. */
+ /* */
+ /* o an array of intersection coordinates for each scanline */
+ /* between `Ymin' and `Ymax'. */
+ /* */
+ /* o a direction, indicating wether is was built going `up' or */
+ /* `down', as this is very important for filling rules. */
+ /* */
+ /* 2 - Sweeping the target map's scanlines in order to compute segment */
+ /* `spans' which are then filled. Additionaly, this pass performs */
+ /* drop-out control. */
+ /* */
+ /* The outline data is parsed during step 1 only. The profiles are */
+ /* built from the bottom of the render pool, used as a stack. The */
+ /* following graphics shows the profile list under construction: */
+ /* */
+ /* ____________________________________________________________ _ _ */
+ /* | | | | | */
+ /* | profile | coordinates for | profile | coordinates for |--> */
+ /* | 1 | profile 1 | 2 | profile 2 |--> */
+ /* |_________|___________________|_________|_________________|__ _ _ */
+ /* */
+ /* ^ ^ */
+ /* | | */
+ /* start of render pool top */
+ /* */
+ /* The top of the profile stack is kept in the `top' variable. */
+ /* */
+ /* As you can see, a profile record is pushed on top of the render */
+ /* pool, which is then followed by its coordinates/intersections. If */
+ /* a change of direction is detected in the outline, a new profile is */
+ /* generated until the end of the outline. */
+ /* */
+ /* Note that when all profiles have been generated, the function */
+ /* Finalize_Profile_Table() is used to record, for each profile, its */
+ /* bottom-most scanline as well as the scanline above its upmost */
+ /* boundary. These positions are called `y-turns' because they (sort */
+ /* of) correspond to local extrema. They are stored in a sorted list */
+ /* built from the top of the render pool as a downwards stack: */
+ /* */
+ /* _ _ _______________________________________ */
+ /* | | */
+ /* <--| sorted list of | */
+ /* <--| extrema scanlines | */
+ /* _ _ __________________|____________________| */
+ /* */
+ /* ^ ^ */
+ /* | | */
+ /* maxBuff sizeBuff = end of pool */
+ /* */
+ /* This list is later used during the sweep phase in order to */
+ /* optimize performance (see technical note on the sweep below). */
+ /* */
+ /* Of course, the raster detects whether the two stacks collide and */
+ /* handles the situation propertly. */
+ /* */
+ /*************************************************************************/
+
/****************************************************************/
/****************************************************************/
/** **/
diff --git a/demos/src/ftrast2.c b/demos/src/ftrast2.c
new file mode 100644
index 0000000..7f8715c
--- /dev/null
+++ b/demos/src/ftrast2.c
@@ -0,0 +1,3971 @@
+/*******************************************************************
+ *
+ * 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 "ftraster.h"
+#include <freetype.h> /* for FT_Outline_Decompose */
+
+#ifndef EXPORT_FUNC
+#define EXPORT_FUNC /* nothing */
+#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.. */
+/* */
+#define 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)
+
+
+/* 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 long 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 onochrome */
+ /* 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;
+ }
+
+/****************************************************************************/
+/* */
+/* <Function> Push_Conic */
+/* */
+/* <Description> Clears the Bezier stack and pushes a new arc on top of it */
+/* */
+/* <Input> */
+/* p2 :: pointer to second (control) point */
+/* p3 :: pointer to third (end) point */
+/* */
+/* <Note> */
+/* The first point is taken as "raster->last", so it doesn't appear */
+/* in the signature.. */
+/* */
+/****************************************************************************/
+
+ static
+ void Push_Conic( RAS_ARGS FT_Vector* p2,
+ FT_Vector* p3 )
+ {
+#undef STORE
+#define STORE( _arc, point ) \
+ { \
+ TPos x = SCALED(point->x); \
+ TPos y = SCALED(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
+ }
+
+
+/****************************************************************************/
+/* */
+/* <Function> Conic_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 :: minimum vertical grid coordinate */
+/* maxy :: maximum vertical grid coordinate */
+/* */
+/* <Return> */
+/* SUCCESS or FAILURE */
+/* */
+/****************************************************************************/
+
+ static
+ TBool Conic_Up( RAS_ARGS TPos miny, TPos maxy )
+ {
+ TPos y1, y2, e, e2, e0;
+ int f1;
+
+ TPoint* arc;
+ TPoint* start_arc;
+
+ PPos top;
+
+
+ arc = ras.arc;
+ y1 = arc[2].y;
+ y2 = arc[0].y;
+ top = ras.cursor;
+
+ if ( y2 < miny || y1 > maxy )
+ goto Fin;
+
+ e2 = FLOOR( y2 );
+
+ if ( e2 > maxy )
+ e2 = maxy;
+
+ e0 = miny;
+
+ if ( y1 < miny )
+ e = miny;
+ else
+ {
+ e = CEILING( y1 );
+ f1 = FRAC( y1 );
+ e0 = e;
+
+ if ( f1 == 0 )
+ {
+ if ( ras.joint )
+ {
+ top--;
+ ras.joint = FALSE;
+ }
+
+ *top++ = arc[2].x;
+
+ DEBUG_PSET;
+
+ e += ras.precision;
+ }
+ }
+
+ if ( ras.fresh )
+ {
+ ras.cur_prof->start = TRUNC( e0 );
+ ras.fresh = FALSE;
+ }
+
+ if ( e2 < e )
+ goto Fin;
+
+ if ( ( top+TRUNC(e2-e)+1 ) >= ras.pool_limit )
+ {
+ ras.cursor = top;
+ ras.error = ErrRaster_Overflow;
+ return FAILURE;
+ }
+
+ start_arc = arc;
+
+ while ( arc >= start_arc && e <= e2 )
+ {
+ ras.joint = FALSE;
+
+ y2 = arc[0].y;
+
+ if ( y2 > e )
+ {
+ y1 = arc[2].y;
+ if ( y2 - y1 >= ras.precision_step )
+ {
+ Split_Conic( arc );
+ arc += 2;
+ }
+ else
+ {
+ *top++ = arc[2].x +
+ FMulDiv( arc[0].x-arc[2].x,
+ e - y1,
+ y2 - y1 );
+ DEBUG_PSET;
+
+ arc -= 2;
+ e += ras.precision;
+ }
+ }
+ else
+ {
+ if ( y2 == e )
+ {
+ ras.joint = TRUE;
+ *top++ = arc[0].x;
+
+ DEBUG_PSET;
+
+ e += ras.precision;
+ }
+ arc -= 2;
+ }
+ }
+
+ Fin:
+ ras.cursor = top;
+ ras.arc -= 2;
+ return SUCCESS;
+ }
+
+
+/****************************************************************************/
+/* */
+/* <Function> Conic_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 :: minimum vertical grid coordinate */
+/* maxy :: maximum vertical grid coordinate */
+/* */
+/* <Return> */
+/* SUCCESS or FAILURE */
+/* */
+/****************************************************************************/
+
+ static
+ TBool Conic_Down( RAS_ARGS 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;
+
+ fresh = ras.fresh;
+
+ result = Conic_Up( RAS_VARS -maxy, -miny );
+
+ if ( fresh && !ras.fresh )
+ ras.cur_prof->start = -ras.cur_prof->start;
+
+ arc[0].y = -arc[0].y;
+ return result;
+ }
+
+#endif /* FT_RASTER_CONIC_BEZIERS */
+
+
+
+#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;
+ }
+
+/****************************************************************************/
+/* */
+/* <Function> Push_Cubic */
+/* */
+/* <Description> */
+/* Clears the bezier stack and pushes a new third-order bezier arc */
+/* on top of it */
+/* */
+/* <Input> */
+/* p2 :: pointer to second point (control) */
+/* p3 :: pointer to third point (control) */
+/* p4 :: pointer to last point (end) */
+/* */
+/* <Note> */
+/* The first point is taken as "raster->last", so it doesn't appear */
+/* in the signature.. */
+/* */
+/****************************************************************************/
+
+ static
+ void Push_Cubic( RAS_ARGS FT_Vector* p2,
+ FT_Vector* p3,
+ FT_Vector* p4 )
+ {
+#undef STORE
+#define STORE( _arc, point ) \
+ { \
+ TPos x = SCALED(point->x); \
+ TPos y = SCALED(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
+ }
+
+
+/****************************************************************************/
+/* */
+/* <Function> Cubic_Up */
+/* */
+/* <Description> */
+/* Computes the scan-line intersections of an ascending third-order */
+/* bezier arc and stores them in the render pool */
+/* */
+/* <Input> */
+/* miny :: minimum vertical grid coordinate */
+/* maxy :: maximum vertical grid coordinate */
+/* */
+/* <Return> */
+/* SUCCESS or FAILURE */
+/* */
+/****************************************************************************/
+ static
+ TBool Cubic_Up( RAS_ARGS TPos miny, TPos maxy )
+ {
+ TPos y1, y2, e, e2, e0;
+ int f1;
+
+ TPoint* arc;
+ TPoint* start_arc;
+
+ TPos* top;
+
+
+ arc = ras.arc;
+ y1 = arc[3].y;
+ y2 = arc[0].y;
+ top = ras.cursor;
+
+ if ( y2 < miny || y1 > maxy )
+ goto Fin;
+
+ e2 = FLOOR( y2 );
+
+ if ( e2 > maxy )
+ e2 = maxy;
+
+ e0 = miny;
+
+ if ( y1 < miny )
+ e = miny;
+ else
+ {
+ e = CEILING( y1 );
+ f1 = FRAC( y1 );
+ e0 = e;
+
+ if ( f1 == 0 )
+ {
+ if ( ras.joint )
+ {
+ top--;
+ ras.joint = FALSE;
+ }
+
+ *top++ = arc[3].x;
+
+ DEBUG_PSET;
+
+ e += ras.precision;
+ }
+ }
+
+ if ( ras.fresh )
+ {
+ ras.cur_prof->start = TRUNC( e0 );
+ ras.fresh = FALSE;
+ }
+
+ if ( e2 < e )
+ goto Fin;
+
+ if ( ( top+TRUNC(e2-e)+1 ) >= ras.pool_limit )
+ {
+ ras.cursor = top;
+ ras.error = ErrRaster_Overflow;
+ return FAILURE;
+ }
+
+ start_arc = arc;
+
+ while ( arc >= start_arc && e <= e2 )
+ {
+ ras.joint = FALSE;
+
+ y2 = arc[0].y;
+
+ if ( y2 > e )
+ {
+ y1 = arc[3].y;
+ if ( y2 - y1 >= ras.precision_step )
+ {
+ Split_Cubic( arc );
+ arc += 3;
+ }
+ else
+ {
+ *top++ = arc[3].x +
+ FMulDiv( arc[0].x-arc[3].x,
+ e - y1,
+ y2 - y1 );
+ DEBUG_PSET;
+
+ arc -= 3;
+ e += ras.precision;
+ }
+ }
+ else
+ {
+ if ( y2 == e )
+ {
+ ras.joint = TRUE;
+ *top++ = arc[0].x;
+
+ DEBUG_PSET;
+
+ e += ras.precision;
+ }
+ arc -= 3;
+ }
+ }
+
+ Fin:
+ ras.cursor = top;
+ ras.arc -= 3;
+ return SUCCESS;
+ }
+
+
+/****************************************************************************/
+/* */
+/* <Function> Cubic_Down */
+/* */
+/* <Description> */
+/* Computes the scan-line intersections of a descending third-order */
+/* bezier arc and stores them in the render pool */
+/* */
+/* <Input> */
+/* miny :: minimum vertical grid coordinate */
+/* maxy :: maximum vertical grid coordinate */
+/* */
+/* <Return> */
+/* SUCCESS or FAILURE */
+/* */
+/****************************************************************************/
+ static
+ TBool Cubic_Down( RAS_ARGS 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;
+ arc[3].y = -arc[3].y;
+
+ fresh = ras.fresh;
+
+ result = Cubic_Up( RAS_VARS -maxy, -miny );
+
+ if ( fresh && !ras.fresh )
+ ras.cur_prof->start = -ras.cur_prof->start;
+
+ arc[0].y = -arc[0].y;
+ return result;
+ }
+
+#endif /* FT_RASTER_CUBIC_BEZIERS */
+
+/****************************************************************************/
+/* */
+/* <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 = SCALED( to->y );
+ ras.last.y = SCALED( to->x );
+ }
+ else
+ {
+ ras.last.x = SCALED( to->x );
+ ras.last.y = SCALED( 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;
+
+ if ( ras.flipped )
+ {
+ x = SCALED(to->y);
+ y = SCALED(to->x);
+ }
+ else
+ {
+ x = SCALED(to->x);
+ y = SCALED(to->y);
+ }
+
+ /* First, detect a change of direction */
+
+ switch ( ras.state )
+ {
+ case Unknown:
+ if ( y > ras.last.y )
+ {
+ if ( New_Profile( RAS_VARS Ascending ) ) return FAILURE;
+ }
+ else
+ {
+ if ( y < ras.last.y )
+ if ( New_Profile( RAS_VARS Descending ) ) return FAILURE;
+ }
+ break;
+
+ case Ascending:
+ if ( y < ras.last.y )
+ {
+ if ( End_Profile( RAS_VAR ) ||
+ New_Profile( RAS_VARS Descending ) ) return FAILURE;
+ }
+ break;
+
+ case Descending:
+ if ( y > ras.last.y )
+ {
+ if ( End_Profile( RAS_VAR ) ||
+ New_Profile( RAS_VARS Ascending ) ) return FAILURE;
+ }
+ break;
+
+ default:
+ ;
+ }
+
+ /* Then compute the lines */
+
+ switch ( ras.state )
+ {
+ case Ascending:
+ if ( Line_Up ( RAS_VARS ras.last.x, ras.last.y,
+ x, y, ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ case Descending:
+ if ( Line_Down( RAS_VARS ras.last.x, ras.last.y,
+ x, y, ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ default:
+ ;
+ }
+
+ ras.last.x = x;
+ ras.last.y = y;
+
+ return SUCCESS;
+ }
+
+#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
+ 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 )
+ if ( End_Profile( RAS_VAR ) ) return FAILURE;
+
+ if ( New_Profile( RAS_VARS state_bez ) ) return FAILURE;
+ }
+
+ /* compute intersections */
+ switch ( ras.state )
+ {
+ case Ascending:
+ if ( Conic_Up ( RAS_VARS ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ case Descending:
+ if ( Conic_Down( RAS_VARS ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ default:
+ ;
+ }
+ }
+ } while ( ras.arc >= ras.arcs );
+
+ ras.last.x = x3;
+ ras.last.y = y3;
+
+ return 0;
+ }
+
+#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
+ 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 )
+ if ( End_Profile( RAS_VAR ) ) return FAILURE;
+
+ if ( New_Profile( RAS_VARS state_bez ) ) return FAILURE;
+ }
+
+ /* compute */
+
+ switch ( ras.state )
+ {
+ case Ascending:
+ if ( Cubic_Up ( RAS_VARS ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ case Descending:
+ if ( Cubic_Down( RAS_VARS ras.minY, ras.maxY ) )
+ return FAILURE;
+ break;
+
+ default:
+ ;
+ }
+ }
+ } while ( ras.arc >= ras.arcs );
+
+ ras.last.x = x4;
+ ras.last.y = y4;
+
+ return 0;
+ }
+
+#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
+ };
+
+ /* 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;
+
+ /* 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 = ¤t->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 = ¤t->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 = ¤t->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;
+
+ 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 */
+
+ 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;
+
+ 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 */
+
+ 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 */
+ }
+
+
+/***********************************************************************/
+/* */
+/* <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;
+
+
+ /* 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 */
+ }
+
+
+/**************************************************************************/
+/**************************************************************************/
+/**************************************************************************/
+/******** *********/
+/******** 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 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 )
+ {
+ static
+ const unsigned int LMask[17] =
+#ifdef FT_RASTER_LITTLE_ENDIAN
+ { 0xF0F0F0F0, 0xF0F0F070, 0xF0F0F030, 0xF0F0F010,
+ 0xF0F0F000, 0xF0F07000, 0xF0F03000, 0xF0F01000,
+ 0xF0F00000, 0xF0700000, 0xF0300000, 0xF0100000,
+ 0xF0000000, 0x70000000, 0x30000000, 0x10000000,
+ 0x00000000 };
+#else
+ { 0xF0F0F0F0, 0x70F0F0F0, 0x30F0F0F0, 0x10F0F0F0,
+ 0x00F0F0F0, 0x0070F0F0, 0x0030F0F0, 0x0010F0F0,
+ 0x0000F0F0, 0x000070F0, 0x000030F0, 0x000010F0,
+ 0x000000F0, 0x00000070, 0x00000030, 0x00000010,
+ 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 & 1)*4;
+
+ c1 = e1 >> 4;
+ c2 = e2 >> 4;
+
+ fill = LMask[0];
+ f1 = LMask[ e1 & 15 ];
+ f2 = fill ^ LMask[ 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)
+ {
+ 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_Gray5_Test_Pixel( RAS_ARGS int y,
+ int x )
+ {
+ int c1 = x >> 2;
+ int f1 = x & 3;
+ int mask = (0x80 >> f1) >> ((y & 1)*4);
+
+ return ( x >= 0 &&
+ x < ras.bit_width &&
+ ras.bit_buffer[c1] & mask );
+ }
+
+
+ static
+ void Vertical_Gray5_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 = (0x80 >> f1) >> ((y & 1)*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;
+
+ ras.bit_buffer[c1] |= 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 */
+ (void)y;
+ (void)x1;
+ (void)x2;
+ }
+
+
+ static
+ int Horizontal_Gray5_Test_Pixel( RAS_ARGS TScan y,
+ int x )
+ {
+ /* don't do anything here */
+ (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 */
+ (void)y;
+ (void)x1;
+ (void)x2;
+ }
+
+
+ static
+ int Horizontal_Gray17_Test_Pixel( RAS_ARGS TScan y,
+ int x )
+ {
+ /* don't do anything here */
+ (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 )
+ {
+ 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);
+
+ 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;
+
+ 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 )
+ {
+ 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 )
+ {
+ 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 <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
+ };
+
+
diff --git a/demos/src/ftrast2.h b/demos/src/ftrast2.h
new file mode 100644
index 0000000..8cd9adb
--- /dev/null
+++ b/demos/src/ftrast2.h
@@ -0,0 +1,42 @@
+/*******************************************************************
+ *
+ * ftraster.h v 2.0
+ *
+ * The FreeType glyph scan-line converter (interface)
+ *
+ * Copyright 1996-2000 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.
+ *
+ *
+ ******************************************************************/
+
+#ifndef FTRAST2_H
+#define FTRAST2_H
+
+#include <ftimage.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef EXPORT_DEF
+#define EXPORT_DEF /* nothing */
+#endif
+
+ EXPORT_DEF
+ FT_Raster_Funcs ft_black2_raster;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* FTRAST2_H */
+
+
+/* END */
diff --git a/demos/src/ftview.c b/demos/src/ftview.c
index b0c0921..e0367b4 100644
--- a/demos/src/ftview.c
+++ b/demos/src/ftview.c
@@ -28,7 +28,7 @@
#include "grfont.h"
#include "ftgrays.h"
-#include "ftrast.h"
+#include "ftrast2.h"
#define DIM_X 500
#define DIM_Y 400
@@ -425,7 +425,7 @@ $\243^\250*\265\371%!\247:/;.,?<>";
error = 1;
if ( !antialias)
- error = FT_Set_Raster( library, &ft_black_raster );
+ error = FT_Set_Raster( library, &ft_black2_raster );
else if ( use_grays && antialias )
error = FT_Set_Raster( library, &ft_grays_raster );