kc3-lang/freetype/demos/src/ftrast2.c
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Hash : 08c38755
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Date : 2000-05-04T16:36:34
at last, the bug seems to be solved. Now, the source code should be cleaned up, and we'll be done with the raster :o)
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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 "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) #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 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; } #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 #ifdef FT_RASTER_CONIC_BEZIERS /****************************************************************************/ /* */ /* <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> 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 */ /* 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 = ¤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; (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 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); (void)y; 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 */ (void)y; 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 */ 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 ) { 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 };