-/***************************************************************************/\r
-/* */\r
-/* ftgrays.c */\r
-/* */\r
-/* A new `perfect' anti-aliasing renderer (body). */\r
-/* */\r
-/* Copyright 2000-2001, 2002, 2003, 2005, 2006, 2007 by */\r
-/* David Turner, Robert Wilhelm, and Werner Lemberg. */\r
-/* */\r
-/* This file is part of the FreeType project, and may only be used, */\r
-/* modified, and distributed under the terms of the FreeType project */\r
-/* license, LICENSE.TXT. By continuing to use, modify, or distribute */\r
-/* this file you indicate that you have read the license and */\r
-/* understand and accept it fully. */\r
-/* */\r
-/***************************************************************************/\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* This file can be compiled without the rest of the FreeType engine, by */\r
- /* defining the _STANDALONE_ macro when compiling it. You also need to */\r
- /* put the files `ftgrays.h' and `ftimage.h' into the current */\r
- /* compilation directory. Typically, you could do something like */\r
- /* */\r
- /* - copy `src/smooth/ftgrays.c' (this file) to your current directory */\r
- /* */\r
- /* - copy `include/freetype/ftimage.h' and `src/smooth/ftgrays.h' to the */\r
- /* same directory */\r
- /* */\r
- /* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */\r
- /* */\r
- /* cc -c -D_STANDALONE_ ftgrays.c */\r
- /* */\r
- /* The renderer can be initialized with a call to */\r
- /* `ft_gray_raster.raster_new'; an anti-aliased bitmap can be generated */\r
- /* with a call to `ft_gray_raster.raster_render'. */\r
- /* */\r
- /* See the comments and documentation in the file `ftimage.h' for more */\r
- /* details on how the raster works. */\r
- /* */\r
- /*************************************************************************/\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* This is a new anti-aliasing scan-converter for FreeType 2. The */\r
- /* algorithm used here is _very_ different from the one in the standard */\r
- /* `ftraster' module. Actually, `ftgrays' computes the _exact_ */\r
- /* coverage of the outline on each pixel cell. */\r
- /* */\r
- /* It is based on ideas that I initially found in Raph Levien's */\r
- /* excellent LibArt graphics library (see http://www.levien.com/libart */\r
- /* for more information, though the web pages do not tell anything */\r
- /* about the renderer; you'll have to dive into the source code to */\r
- /* understand how it works). */\r
- /* */\r
- /* Note, however, that this is a _very_ different implementation */\r
- /* compared to Raph's. Coverage information is stored in a very */\r
- /* different way, and I don't use sorted vector paths. Also, it doesn't */\r
- /* use floating point values. */\r
- /* */\r
- /* This renderer has the following advantages: */\r
- /* */\r
- /* - It doesn't need an intermediate bitmap. Instead, one can supply a */\r
- /* callback function that will be called by the renderer to draw gray */\r
- /* spans on any target surface. You can thus do direct composition on */\r
- /* any kind of bitmap, provided that you give the renderer the right */\r
- /* callback. */\r
- /* */\r
- /* - A perfect anti-aliaser, i.e., it computes the _exact_ coverage on */\r
- /* each pixel cell. */\r
- /* */\r
- /* - It performs a single pass on the outline (the `standard' FT2 */\r
- /* renderer makes two passes). */\r
- /* */\r
- /* - It can easily be modified to render to _any_ number of gray levels */\r
- /* cheaply. */\r
- /* */\r
- /* - For small (< 20) pixel sizes, it is faster than the standard */\r
- /* renderer. */\r
- /* */\r
- /*************************************************************************/\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* The macro FT_COMPONENT is used in trace mode. It is an implicit */\r
- /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */\r
- /* messages during execution. */\r
- /* */\r
-#undef FT_COMPONENT\r
-#define FT_COMPONENT trace_smooth\r
-\r
-\r
-\r
-\r
-#ifdef _STANDALONE_\r
-\r
-#include <string.h> /* for ft_memcpy() */\r
-#include <setjmp.h>\r
-#include <limits.h>\r
-#define FT_UINT_MAX UINT_MAX\r
-\r
-#define ft_memset memset\r
-\r
-#define ft_setjmp setjmp\r
-#define ft_longjmp longjmp\r
-#define ft_jmp_buf jmp_buf\r
-\r
-\r
-#define ErrRaster_Invalid_Mode -2\r
-#define ErrRaster_Invalid_Outline -1\r
-#define ErrRaster_Invalid_Argument -3\r
-#define ErrRaster_Memory_Overflow -4\r
-\r
-#define FT_BEGIN_HEADER\r
-#define FT_END_HEADER\r
-\r
-#include "ftimage.h"\r
-#include "ftgrays.h"\r
-\r
- /* This macro is used to indicate that a function parameter is unused. */\r
- /* Its purpose is simply to reduce compiler warnings. Note also that */\r
- /* simply defining it as `(void)x' doesn't avoid warnings with certain */\r
- /* ANSI compilers (e.g. LCC). */\r
-#define FT_UNUSED( x ) (x) = (x)\r
-\r
- /* Disable the tracing mechanism for simplicity -- developers can */\r
- /* activate it easily by redefining these two macros. */\r
-#ifndef FT_ERROR\r
-#define FT_ERROR( x ) do ; while ( 0 ) /* nothing */\r
-#endif\r
-\r
-#ifndef FT_TRACE\r
-#define FT_TRACE( x ) do ; while ( 0 ) /* nothing */\r
-#endif\r
-\r
-#else /* !_STANDALONE_ */\r
-\r
-#include <ft2build.h>\r
-#include "ftgrays.h"\r
-#include FT_INTERNAL_OBJECTS_H\r
-#include FT_INTERNAL_DEBUG_H\r
-#include FT_OUTLINE_H\r
-\r
-#include "ftsmerrs.h"\r
-\r
-#define ErrRaster_Invalid_Mode Smooth_Err_Cannot_Render_Glyph\r
-#define ErrRaster_Invalid_Outline Smooth_Err_Invalid_Outline\r
-#define ErrRaster_Memory_Overflow Smooth_Err_Out_Of_Memory\r
-#define ErrRaster_Invalid_Argument Smooth_Err_Bad_Argument\r
-\r
-#endif /* !_STANDALONE_ */\r
-\r
-\r
-#ifndef FT_MEM_SET\r
-#define FT_MEM_SET( d, s, c ) ft_memset( d, s, c )\r
-#endif\r
-\r
-#ifndef FT_MEM_ZERO\r
-#define FT_MEM_ZERO( dest, count ) FT_MEM_SET( dest, 0, count )\r
-#endif\r
-\r
- /* define this to dump debugging information */\r
-#define xxxDEBUG_GRAYS\r
-\r
-\r
- /* as usual, for the speed hungry :-) */\r
-\r
-#ifndef FT_STATIC_RASTER\r
-\r
-\r
-#define RAS_ARG PWorker worker\r
-#define RAS_ARG_ PWorker worker,\r
-\r
-#define RAS_VAR worker\r
-#define RAS_VAR_ worker,\r
-\r
-#define ras (*worker)\r
-\r
-\r
-#else /* FT_STATIC_RASTER */\r
-\r
-\r
-#define RAS_ARG /* empty */\r
-#define RAS_ARG_ /* empty */\r
-#define RAS_VAR /* empty */\r
-#define RAS_VAR_ /* empty */\r
-\r
- static TWorker ras;\r
-\r
-\r
-#endif /* FT_STATIC_RASTER */\r
-\r
-\r
- /* must be at least 6 bits! */\r
-#define PIXEL_BITS 8\r
-\r
-#define ONE_PIXEL ( 1L << PIXEL_BITS )\r
-#define PIXEL_MASK ( -1L << PIXEL_BITS )\r
-#define TRUNC( x ) ( (TCoord)( (x) >> PIXEL_BITS ) )\r
-#define SUBPIXELS( x ) ( (TPos)(x) << PIXEL_BITS )\r
-#define FLOOR( x ) ( (x) & -ONE_PIXEL )\r
-#define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL )\r
-#define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL )\r
-\r
-#if PIXEL_BITS >= 6\r
-#define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) )\r
-#define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) )\r
-#else\r
-#define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) )\r
-#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )\r
-#endif\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* TYPE DEFINITIONS */\r
- /* */\r
-\r
- /* don't change the following types to FT_Int or FT_Pos, since we might */\r
- /* need to define them to "float" or "double" when experimenting with */\r
- /* new algorithms */\r
-\r
- typedef int TCoord; /* integer scanline/pixel coordinate */\r
- typedef long TPos; /* sub-pixel coordinate */\r
-\r
- /* determine the type used to store cell areas. This normally takes at */\r
- /* least PIXEL_BITS*2 + 1 bits. On 16-bit systems, we need to use */\r
- /* `long' instead of `int', otherwise bad things happen */\r
-\r
-#if PIXEL_BITS <= 7\r
-\r
- typedef int TArea;\r
-\r
-#else /* PIXEL_BITS >= 8 */\r
-\r
- /* approximately determine the size of integers using an ANSI-C header */\r
-#if FT_UINT_MAX == 0xFFFFU\r
- typedef long TArea;\r
-#else\r
- typedef int TArea;\r
-#endif\r
-\r
-#endif /* PIXEL_BITS >= 8 */\r
-\r
-\r
- /* maximal number of gray spans in a call to the span callback */\r
-#define FT_MAX_GRAY_SPANS 32\r
-\r
-\r
- typedef struct TCell_* PCell;\r
-\r
- typedef struct TCell_\r
- {\r
- int x;\r
- int cover;\r
- TArea area;\r
- PCell next;\r
-\r
- } TCell;\r
-\r
-\r
- typedef struct TWorker_\r
- {\r
- TCoord ex, ey;\r
- TPos min_ex, max_ex;\r
- TPos min_ey, max_ey;\r
- TPos count_ex, count_ey;\r
-\r
- TArea area;\r
- int cover;\r
- int invalid;\r
-\r
- PCell cells;\r
- int max_cells;\r
- int num_cells;\r
-\r
- TCoord cx, cy;\r
- TPos x, y;\r
-\r
- TPos last_ey;\r
-\r
- FT_Vector bez_stack[32 * 3 + 1];\r
- int lev_stack[32];\r
-\r
- FT_Outline outline;\r
- FT_Bitmap target;\r
- FT_BBox clip_box;\r
-\r
- FT_Span gray_spans[FT_MAX_GRAY_SPANS];\r
- int num_gray_spans;\r
-\r
- FT_Raster_Span_Func render_span;\r
- void* render_span_data;\r
- int span_y;\r
-\r
- int band_size;\r
- int band_shoot;\r
- int conic_level;\r
- int cubic_level;\r
-\r
- ft_jmp_buf jump_buffer;\r
-\r
- void* buffer;\r
- long buffer_size;\r
-\r
- PCell* ycells;\r
- int ycount;\r
-\r
- } TWorker, *PWorker;\r
-\r
-\r
- typedef struct TRaster_\r
- {\r
- void* buffer;\r
- long buffer_size;\r
- int band_size;\r
- void* memory;\r
- PWorker worker;\r
-\r
- } TRaster, *PRaster;\r
-\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Initialize the cells table. */\r
- /* */\r
- static void\r
- gray_init_cells( RAS_ARG_ void* buffer,\r
- long byte_size )\r
- {\r
- ras.buffer = buffer;\r
- ras.buffer_size = byte_size;\r
-\r
- ras.ycells = (PCell*) buffer;\r
- ras.cells = NULL;\r
- ras.max_cells = 0;\r
- ras.num_cells = 0;\r
- ras.area = 0;\r
- ras.cover = 0;\r
- ras.invalid = 1;\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Compute the outline bounding box. */\r
- /* */\r
- static void\r
- gray_compute_cbox( RAS_ARG )\r
- {\r
- FT_Outline* outline = &ras.outline;\r
- FT_Vector* vec = outline->points;\r
- FT_Vector* limit = vec + outline->n_points;\r
-\r
-\r
- if ( outline->n_points <= 0 )\r
- {\r
- ras.min_ex = ras.max_ex = 0;\r
- ras.min_ey = ras.max_ey = 0;\r
- return;\r
- }\r
-\r
- ras.min_ex = ras.max_ex = vec->x;\r
- ras.min_ey = ras.max_ey = vec->y;\r
-\r
- vec++;\r
-\r
- for ( ; vec < limit; vec++ )\r
- {\r
- TPos x = vec->x;\r
- TPos y = vec->y;\r
-\r
-\r
- if ( x < ras.min_ex ) ras.min_ex = x;\r
- if ( x > ras.max_ex ) ras.max_ex = x;\r
- if ( y < ras.min_ey ) ras.min_ey = y;\r
- if ( y > ras.max_ey ) ras.max_ey = y;\r
- }\r
-\r
- /* truncate the bounding box to integer pixels */\r
- ras.min_ex = ras.min_ex >> 6;\r
- ras.min_ey = ras.min_ey >> 6;\r
- ras.max_ex = ( ras.max_ex + 63 ) >> 6;\r
- ras.max_ey = ( ras.max_ey + 63 ) >> 6;\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Record the current cell in the table. */\r
- /* */\r
- static PCell\r
- gray_find_cell( RAS_ARG )\r
- {\r
- PCell *pcell, cell;\r
- int x = ras.ex;\r
-\r
-\r
- if ( x > ras.max_ex )\r
- x = ras.max_ex;\r
-\r
- pcell = &ras.ycells[ras.ey];\r
- for (;;)\r
- {\r
- cell = *pcell;\r
- if ( cell == NULL || cell->x > x )\r
- break;\r
-\r
- if ( cell->x == x )\r
- goto Exit;\r
-\r
- pcell = &cell->next;\r
- }\r
-\r
- if ( ras.num_cells >= ras.max_cells )\r
- ft_longjmp( ras.jump_buffer, 1 );\r
-\r
- cell = ras.cells + ras.num_cells++;\r
- cell->x = x;\r
- cell->area = 0;\r
- cell->cover = 0;\r
-\r
- cell->next = *pcell;\r
- *pcell = cell;\r
-\r
- Exit:\r
- return cell;\r
- }\r
-\r
-\r
- static void\r
- gray_record_cell( RAS_ARG )\r
- {\r
- if ( !ras.invalid && ( ras.area | ras.cover ) )\r
- {\r
- PCell cell = gray_find_cell( RAS_VAR );\r
-\r
-\r
- cell->area += ras.area;\r
- cell->cover += ras.cover;\r
- }\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Set the current cell to a new position. */\r
- /* */\r
- static void\r
- gray_set_cell( RAS_ARG_ TCoord ex,\r
- TCoord ey )\r
- {\r
- /* Move the cell pointer to a new position. We set the `invalid' */\r
- /* flag to indicate that the cell isn't part of those we're interested */\r
- /* in during the render phase. This means that: */\r
- /* */\r
- /* . the new vertical position must be within min_ey..max_ey-1. */\r
- /* . the new horizontal position must be strictly less than max_ex */\r
- /* */\r
- /* Note that if a cell is to the left of the clipping region, it is */\r
- /* actually set to the (min_ex-1) horizontal position. */\r
-\r
- /* All cells that are on the left of the clipping region go to the */\r
- /* min_ex - 1 horizontal position. */\r
- ey -= ras.min_ey;\r
-\r
- if ( ex > ras.max_ex )\r
- ex = ras.max_ex;\r
-\r
- ex -= ras.min_ex;\r
- if ( ex < 0 )\r
- ex = -1;\r
-\r
- /* are we moving to a different cell ? */\r
- if ( ex != ras.ex || ey != ras.ey )\r
- {\r
- /* record the current one if it is valid */\r
- if ( !ras.invalid )\r
- gray_record_cell( RAS_VAR );\r
-\r
- ras.area = 0;\r
- ras.cover = 0;\r
- }\r
-\r
- ras.ex = ex;\r
- ras.ey = ey;\r
- ras.invalid = ( (unsigned)ey >= (unsigned)ras.count_ey ||\r
- ex >= ras.count_ex );\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Start a new contour at a given cell. */\r
- /* */\r
- static void\r
- gray_start_cell( RAS_ARG_ TCoord ex,\r
- TCoord ey )\r
- {\r
- if ( ex > ras.max_ex )\r
- ex = (TCoord)( ras.max_ex );\r
-\r
- if ( ex < ras.min_ex )\r
- ex = (TCoord)( ras.min_ex - 1 );\r
-\r
- ras.area = 0;\r
- ras.cover = 0;\r
- ras.ex = ex - ras.min_ex;\r
- ras.ey = ey - ras.min_ey;\r
- ras.last_ey = SUBPIXELS( ey );\r
- ras.invalid = 0;\r
-\r
- gray_set_cell( RAS_VAR_ ex, ey );\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Render a scanline as one or more cells. */\r
- /* */\r
- static void\r
- gray_render_scanline( RAS_ARG_ TCoord ey,\r
- TPos x1,\r
- TCoord y1,\r
- TPos x2,\r
- TCoord y2 )\r
- {\r
- TCoord ex1, ex2, fx1, fx2, delta;\r
- long p, first, dx;\r
- int incr, lift, mod, rem;\r
-\r
-\r
- dx = x2 - x1;\r
-\r
- ex1 = TRUNC( x1 );\r
- ex2 = TRUNC( x2 );\r
- fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );\r
- fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );\r
-\r
- /* trivial case. Happens often */\r
- if ( y1 == y2 )\r
- {\r
- gray_set_cell( RAS_VAR_ ex2, ey );\r
- return;\r
- }\r
-\r
- /* everything is located in a single cell. That is easy! */\r
- /* */\r
- if ( ex1 == ex2 )\r
- {\r
- delta = y2 - y1;\r
- ras.area += (TArea)( fx1 + fx2 ) * delta;\r
- ras.cover += delta;\r
- return;\r
- }\r
-\r
- /* ok, we'll have to render a run of adjacent cells on the same */\r
- /* scanline... */\r
- /* */\r
- p = ( ONE_PIXEL - fx1 ) * ( y2 - y1 );\r
- first = ONE_PIXEL;\r
- incr = 1;\r
-\r
- if ( dx < 0 )\r
- {\r
- p = fx1 * ( y2 - y1 );\r
- first = 0;\r
- incr = -1;\r
- dx = -dx;\r
- }\r
-\r
- delta = (TCoord)( p / dx );\r
- mod = (TCoord)( p % dx );\r
- if ( mod < 0 )\r
- {\r
- delta--;\r
- mod += (TCoord)dx;\r
- }\r
-\r
- ras.area += (TArea)( fx1 + first ) * delta;\r
- ras.cover += delta;\r
-\r
- ex1 += incr;\r
- gray_set_cell( RAS_VAR_ ex1, ey );\r
- y1 += delta;\r
-\r
- if ( ex1 != ex2 )\r
- {\r
- p = ONE_PIXEL * ( y2 - y1 + delta );\r
- lift = (TCoord)( p / dx );\r
- rem = (TCoord)( p % dx );\r
- if ( rem < 0 )\r
- {\r
- lift--;\r
- rem += (TCoord)dx;\r
- }\r
-\r
- mod -= (int)dx;\r
-\r
- while ( ex1 != ex2 )\r
- {\r
- delta = lift;\r
- mod += rem;\r
- if ( mod >= 0 )\r
- {\r
- mod -= (TCoord)dx;\r
- delta++;\r
- }\r
-\r
- ras.area += (TArea)ONE_PIXEL * delta;\r
- ras.cover += delta;\r
- y1 += delta;\r
- ex1 += incr;\r
- gray_set_cell( RAS_VAR_ ex1, ey );\r
- }\r
- }\r
-\r
- delta = y2 - y1;\r
- ras.area += (TArea)( fx2 + ONE_PIXEL - first ) * delta;\r
- ras.cover += delta;\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* Render a given line as a series of scanlines. */\r
- /* */\r
- static void\r
- gray_render_line( RAS_ARG_ TPos to_x,\r
- TPos to_y )\r
- {\r
- TCoord ey1, ey2, fy1, fy2;\r
- TPos dx, dy, x, x2;\r
- long p, first;\r
- int delta, rem, mod, lift, incr;\r
-\r
-\r
- ey1 = TRUNC( ras.last_ey );\r
- ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */\r
- fy1 = (TCoord)( ras.y - ras.last_ey );\r
- fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );\r
-\r
- dx = to_x - ras.x;\r
- dy = to_y - ras.y;\r
-\r
- /* XXX: we should do something about the trivial case where dx == 0, */\r
- /* as it happens very often! */\r
-\r
- /* perform vertical clipping */\r
- {\r
- TCoord min, max;\r
-\r
-\r
- min = ey1;\r
- max = ey2;\r
- if ( ey1 > ey2 )\r
- {\r
- min = ey2;\r
- max = ey1;\r
- }\r
- if ( min >= ras.max_ey || max < ras.min_ey )\r
- goto End;\r
- }\r
-\r
- /* everything is on a single scanline */\r
- if ( ey1 == ey2 )\r
- {\r
- gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 );\r
- goto End;\r
- }\r
-\r
- /* vertical line - avoid calling gray_render_scanline */\r
- incr = 1;\r
-\r
- if ( dx == 0 )\r
- {\r
- TCoord ex = TRUNC( ras.x );\r
- TCoord two_fx = (TCoord)( ( ras.x - SUBPIXELS( ex ) ) << 1 );\r
- TPos area;\r
-\r
-\r
- first = ONE_PIXEL;\r
- if ( dy < 0 )\r
- {\r
- first = 0;\r
- incr = -1;\r
- }\r
-\r
- delta = (int)( first - fy1 );\r
- ras.area += (TArea)two_fx * delta;\r
- ras.cover += delta;\r
- ey1 += incr;\r
-\r
- gray_set_cell( &ras, ex, ey1 );\r
-\r
- delta = (int)( first + first - ONE_PIXEL );\r
- area = (TArea)two_fx * delta;\r
- while ( ey1 != ey2 )\r
- {\r
- ras.area += area;\r
- ras.cover += delta;\r
- ey1 += incr;\r
-\r
- gray_set_cell( &ras, ex, ey1 );\r
- }\r
-\r
- delta = (int)( fy2 - ONE_PIXEL + first );\r
- ras.area += (TArea)two_fx * delta;\r
- ras.cover += delta;\r
-\r
- goto End;\r
- }\r
-\r
- /* ok, we have to render several scanlines */\r
- p = ( ONE_PIXEL - fy1 ) * dx;\r
- first = ONE_PIXEL;\r
- incr = 1;\r
-\r
- if ( dy < 0 )\r
- {\r
- p = fy1 * dx;\r
- first = 0;\r
- incr = -1;\r
- dy = -dy;\r
- }\r
-\r
- delta = (int)( p / dy );\r
- mod = (int)( p % dy );\r
- if ( mod < 0 )\r
- {\r
- delta--;\r
- mod += (TCoord)dy;\r
- }\r
-\r
- x = ras.x + delta;\r
- gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, (TCoord)first );\r
-\r
- ey1 += incr;\r
- gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );\r
-\r
- if ( ey1 != ey2 )\r
- {\r
- p = ONE_PIXEL * dx;\r
- lift = (int)( p / dy );\r
- rem = (int)( p % dy );\r
- if ( rem < 0 )\r
- {\r
- lift--;\r
- rem += (int)dy;\r
- }\r
- mod -= (int)dy;\r
-\r
- while ( ey1 != ey2 )\r
- {\r
- delta = lift;\r
- mod += rem;\r
- if ( mod >= 0 )\r
- {\r
- mod -= (int)dy;\r
- delta++;\r
- }\r
-\r
- x2 = x + delta;\r
- gray_render_scanline( RAS_VAR_ ey1, x,\r
- (TCoord)( ONE_PIXEL - first ), x2,\r
- (TCoord)first );\r
- x = x2;\r
-\r
- ey1 += incr;\r
- gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );\r
- }\r
- }\r
-\r
- gray_render_scanline( RAS_VAR_ ey1, x,\r
- (TCoord)( ONE_PIXEL - first ), to_x,\r
- fy2 );\r
-\r
- End:\r
- ras.x = to_x;\r
- ras.y = to_y;\r
- ras.last_ey = SUBPIXELS( ey2 );\r
- }\r
-\r
-\r
- static void\r
- gray_split_conic( FT_Vector* base )\r
- {\r
- TPos a, b;\r
-\r
-\r
- base[4].x = base[2].x;\r
- b = base[1].x;\r
- a = base[3].x = ( base[2].x + b ) / 2;\r
- b = base[1].x = ( base[0].x + b ) / 2;\r
- base[2].x = ( a + b ) / 2;\r
-\r
- base[4].y = base[2].y;\r
- b = base[1].y;\r
- a = base[3].y = ( base[2].y + b ) / 2;\r
- b = base[1].y = ( base[0].y + b ) / 2;\r
- base[2].y = ( a + b ) / 2;\r
- }\r
-\r
-\r
- static void\r
- gray_render_conic( RAS_ARG_ const FT_Vector* control,\r
- const FT_Vector* to )\r
- {\r
- TPos dx, dy;\r
- int top, level;\r
- int* levels;\r
- FT_Vector* arc;\r
-\r
-\r
- dx = DOWNSCALE( ras.x ) + to->x - ( control->x << 1 );\r
- if ( dx < 0 )\r
- dx = -dx;\r
- dy = DOWNSCALE( ras.y ) + to->y - ( control->y << 1 );\r
- if ( dy < 0 )\r
- dy = -dy;\r
- if ( dx < dy )\r
- dx = dy;\r
-\r
- level = 1;\r
- dx = dx / ras.conic_level;\r
- while ( dx > 0 )\r
- {\r
- dx >>= 2;\r
- level++;\r
- }\r
-\r
- /* a shortcut to speed things up */\r
- if ( level <= 1 )\r
- {\r
- /* we compute the mid-point directly in order to avoid */\r
- /* calling gray_split_conic() */\r
- TPos to_x, to_y, mid_x, mid_y;\r
-\r
-\r
- to_x = UPSCALE( to->x );\r
- to_y = UPSCALE( to->y );\r
- mid_x = ( ras.x + to_x + 2 * UPSCALE( control->x ) ) / 4;\r
- mid_y = ( ras.y + to_y + 2 * UPSCALE( control->y ) ) / 4;\r
-\r
- gray_render_line( RAS_VAR_ mid_x, mid_y );\r
- gray_render_line( RAS_VAR_ to_x, to_y );\r
-\r
- return;\r
- }\r
-\r
- arc = ras.bez_stack;\r
- levels = ras.lev_stack;\r
- top = 0;\r
- levels[0] = level;\r
-\r
- arc[0].x = UPSCALE( to->x );\r
- arc[0].y = UPSCALE( to->y );\r
- arc[1].x = UPSCALE( control->x );\r
- arc[1].y = UPSCALE( control->y );\r
- arc[2].x = ras.x;\r
- arc[2].y = ras.y;\r
-\r
- while ( top >= 0 )\r
- {\r
- level = levels[top];\r
- if ( level > 1 )\r
- {\r
- /* check that the arc crosses the current band */\r
- TPos min, max, y;\r
-\r
-\r
- min = max = arc[0].y;\r
-\r
- y = arc[1].y;\r
- if ( y < min ) min = y;\r
- if ( y > max ) max = y;\r
-\r
- y = arc[2].y;\r
- if ( y < min ) min = y;\r
- if ( y > max ) max = y;\r
-\r
- if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )\r
- goto Draw;\r
-\r
- gray_split_conic( arc );\r
- arc += 2;\r
- top++;\r
- levels[top] = levels[top - 1] = level - 1;\r
- continue;\r
- }\r
-\r
- Draw:\r
- {\r
- TPos to_x, to_y, mid_x, mid_y;\r
-\r
-\r
- to_x = arc[0].x;\r
- to_y = arc[0].y;\r
- mid_x = ( ras.x + to_x + 2 * arc[1].x ) / 4;\r
- mid_y = ( ras.y + to_y + 2 * arc[1].y ) / 4;\r
-\r
- gray_render_line( RAS_VAR_ mid_x, mid_y );\r
- gray_render_line( RAS_VAR_ to_x, to_y );\r
-\r
- top--;\r
- arc -= 2;\r
- }\r
- }\r
-\r
- return;\r
- }\r
-\r
-\r
- static void\r
- gray_split_cubic( FT_Vector* base )\r
- {\r
- TPos a, b, c, d;\r
-\r
-\r
- base[6].x = base[3].x;\r
- c = base[1].x;\r
- d = base[2].x;\r
- base[1].x = a = ( base[0].x + c ) / 2;\r
- base[5].x = b = ( base[3].x + d ) / 2;\r
- c = ( c + d ) / 2;\r
- base[2].x = a = ( a + c ) / 2;\r
- base[4].x = b = ( b + c ) / 2;\r
- base[3].x = ( a + b ) / 2;\r
-\r
- base[6].y = base[3].y;\r
- c = base[1].y;\r
- d = base[2].y;\r
- base[1].y = a = ( base[0].y + c ) / 2;\r
- base[5].y = b = ( base[3].y + d ) / 2;\r
- c = ( c + d ) / 2;\r
- base[2].y = a = ( a + c ) / 2;\r
- base[4].y = b = ( b + c ) / 2;\r
- base[3].y = ( a + b ) / 2;\r
- }\r
-\r
-\r
- static void\r
- gray_render_cubic( RAS_ARG_ const FT_Vector* control1,\r
- const FT_Vector* control2,\r
- const FT_Vector* to )\r
- {\r
- TPos dx, dy, da, db;\r
- int top, level;\r
- int* levels;\r
- FT_Vector* arc;\r
-\r
-\r
- dx = DOWNSCALE( ras.x ) + to->x - ( control1->x << 1 );\r
- if ( dx < 0 )\r
- dx = -dx;\r
- dy = DOWNSCALE( ras.y ) + to->y - ( control1->y << 1 );\r
- if ( dy < 0 )\r
- dy = -dy;\r
- if ( dx < dy )\r
- dx = dy;\r
- da = dx;\r
-\r
- dx = DOWNSCALE( ras.x ) + to->x - 3 * ( control1->x + control2->x );\r
- if ( dx < 0 )\r
- dx = -dx;\r
- dy = DOWNSCALE( ras.y ) + to->y - 3 * ( control1->x + control2->y );\r
- if ( dy < 0 )\r
- dy = -dy;\r
- if ( dx < dy )\r
- dx = dy;\r
- db = dx;\r
-\r
- level = 1;\r
- da = da / ras.cubic_level;\r
- db = db / ras.conic_level;\r
- while ( da > 0 || db > 0 )\r
- {\r
- da >>= 2;\r
- db >>= 3;\r
- level++;\r
- }\r
-\r
- if ( level <= 1 )\r
- {\r
- TPos to_x, to_y, mid_x, mid_y;\r
-\r
-\r
- to_x = UPSCALE( to->x );\r
- to_y = UPSCALE( to->y );\r
- mid_x = ( ras.x + to_x +\r
- 3 * UPSCALE( control1->x + control2->x ) ) / 8;\r
- mid_y = ( ras.y + to_y +\r
- 3 * UPSCALE( control1->y + control2->y ) ) / 8;\r
-\r
- gray_render_line( RAS_VAR_ mid_x, mid_y );\r
- gray_render_line( RAS_VAR_ to_x, to_y );\r
- return;\r
- }\r
-\r
- arc = ras.bez_stack;\r
- arc[0].x = UPSCALE( to->x );\r
- arc[0].y = UPSCALE( to->y );\r
- arc[1].x = UPSCALE( control2->x );\r
- arc[1].y = UPSCALE( control2->y );\r
- arc[2].x = UPSCALE( control1->x );\r
- arc[2].y = UPSCALE( control1->y );\r
- arc[3].x = ras.x;\r
- arc[3].y = ras.y;\r
-\r
- levels = ras.lev_stack;\r
- top = 0;\r
- levels[0] = level;\r
-\r
- while ( top >= 0 )\r
- {\r
- level = levels[top];\r
- if ( level > 1 )\r
- {\r
- /* check that the arc crosses the current band */\r
- TPos min, max, y;\r
-\r
-\r
- min = max = arc[0].y;\r
- y = arc[1].y;\r
- if ( y < min ) min = y;\r
- if ( y > max ) max = y;\r
- y = arc[2].y;\r
- if ( y < min ) min = y;\r
- if ( y > max ) max = y;\r
- y = arc[3].y;\r
- if ( y < min ) min = y;\r
- if ( y > max ) max = y;\r
- if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < 0 )\r
- goto Draw;\r
- gray_split_cubic( arc );\r
- arc += 3;\r
- top ++;\r
- levels[top] = levels[top - 1] = level - 1;\r
- continue;\r
- }\r
-\r
- Draw:\r
- {\r
- TPos to_x, to_y, mid_x, mid_y;\r
-\r
-\r
- to_x = arc[0].x;\r
- to_y = arc[0].y;\r
- mid_x = ( ras.x + to_x + 3 * ( arc[1].x + arc[2].x ) ) / 8;\r
- mid_y = ( ras.y + to_y + 3 * ( arc[1].y + arc[2].y ) ) / 8;\r
-\r
- gray_render_line( RAS_VAR_ mid_x, mid_y );\r
- gray_render_line( RAS_VAR_ to_x, to_y );\r
- top --;\r
- arc -= 3;\r
- }\r
- }\r
-\r
- return;\r
- }\r
-\r
-\r
-\r
- static int\r
- gray_move_to( const FT_Vector* to,\r
- PWorker worker )\r
- {\r
- TPos x, y;\r
-\r
-\r
- /* record current cell, if any */\r
- gray_record_cell( worker );\r
-\r
- /* start to a new position */\r
- x = UPSCALE( to->x );\r
- y = UPSCALE( to->y );\r
-\r
- gray_start_cell( worker, TRUNC( x ), TRUNC( y ) );\r
-\r
- worker->x = x;\r
- worker->y = y;\r
- return 0;\r
- }\r
-\r
-\r
- static int\r
- gray_line_to( const FT_Vector* to,\r
- PWorker worker )\r
- {\r
- gray_render_line( worker, UPSCALE( to->x ), UPSCALE( to->y ) );\r
- return 0;\r
- }\r
-\r
-\r
- static int\r
- gray_conic_to( const FT_Vector* control,\r
- const FT_Vector* to,\r
- PWorker worker )\r
- {\r
- gray_render_conic( worker, control, to );\r
- return 0;\r
- }\r
-\r
-\r
- static int\r
- gray_cubic_to( const FT_Vector* control1,\r
- const FT_Vector* control2,\r
- const FT_Vector* to,\r
- PWorker worker )\r
- {\r
- gray_render_cubic( worker, control1, control2, to );\r
- return 0;\r
- }\r
-\r
-\r
- static void\r
- gray_render_span( int y,\r
- int count,\r
- const FT_Span* spans,\r
- PWorker worker )\r
- {\r
- unsigned char* p;\r
- FT_Bitmap* map = &worker->target;\r
-\r
-\r
- /* first of all, compute the scanline offset */\r
- p = (unsigned char*)map->buffer - y * map->pitch;\r
- if ( map->pitch >= 0 )\r
- p += ( map->rows - 1 ) * map->pitch;\r
-\r
- for ( ; count > 0; count--, spans++ )\r
- {\r
- unsigned char coverage = spans->coverage;\r
-\r
-\r
- if ( coverage )\r
- {\r
- /* For small-spans it is faster to do it by ourselves than\r
- * calling `memset'. This is mainly due to the cost of the\r
- * function call.\r
- */\r
- if ( spans->len >= 8 )\r
- FT_MEM_SET( p + spans->x, (unsigned char)coverage, spans->len );\r
- else\r
- {\r
- unsigned char* q = p + spans->x;\r
-\r
-\r
- switch ( spans->len )\r
- {\r
- case 7: *q++ = (unsigned char)coverage;\r
- case 6: *q++ = (unsigned char)coverage;\r
- case 5: *q++ = (unsigned char)coverage;\r
- case 4: *q++ = (unsigned char)coverage;\r
- case 3: *q++ = (unsigned char)coverage;\r
- case 2: *q++ = (unsigned char)coverage;\r
- case 1: *q = (unsigned char)coverage;\r
- default:\r
- ;\r
- }\r
- }\r
- }\r
- }\r
- }\r
-\r
-\r
- static void\r
- gray_hline( RAS_ARG_ TCoord x,\r
- TCoord y,\r
- TPos area,\r
- int acount )\r
- {\r
- FT_Span* span;\r
- int count;\r
- int coverage;\r
-\r
-\r
- /* compute the coverage line's coverage, depending on the */\r
- /* outline fill rule */\r
- /* */\r
- /* the coverage percentage is area/(PIXEL_BITS*PIXEL_BITS*2) */\r
- /* */\r
- coverage = (int)( area >> ( PIXEL_BITS * 2 + 1 - 8 ) );\r
- /* use range 0..256 */\r
- if ( coverage < 0 )\r
- coverage = -coverage;\r
-\r
- if ( ras.outline.flags & FT_OUTLINE_EVEN_ODD_FILL )\r
- {\r
- coverage &= 511;\r
-\r
- if ( coverage > 256 )\r
- coverage = 512 - coverage;\r
- else if ( coverage == 256 )\r
- coverage = 255;\r
- }\r
- else\r
- {\r
- /* normal non-zero winding rule */\r
- if ( coverage >= 256 )\r
- coverage = 255;\r
- }\r
-\r
- y += (TCoord)ras.min_ey;\r
- x += (TCoord)ras.min_ex;\r
-\r
- /* FT_Span.x is a 16-bit short, so limit our coordinates appropriately */\r
- if ( x >= 32768 )\r
- x = 32767;\r
-\r
- if ( coverage )\r
- {\r
- /* see whether we can add this span to the current list */\r
- count = ras.num_gray_spans;\r
- span = ras.gray_spans + count - 1;\r
- if ( count > 0 &&\r
- ras.span_y == y &&\r
- (int)span->x + span->len == (int)x &&\r
- span->coverage == coverage )\r
- {\r
- span->len = (unsigned short)( span->len + acount );\r
- return;\r
- }\r
-\r
- if ( ras.span_y != y || count >= FT_MAX_GRAY_SPANS )\r
- {\r
- if ( ras.render_span && count > 0 )\r
- ras.render_span( ras.span_y, count, ras.gray_spans,\r
- ras.render_span_data );\r
- /* ras.render_span( span->y, ras.gray_spans, count ); */\r
-\r
-#ifdef DEBUG_GRAYS\r
-\r
- if ( ras.span_y >= 0 )\r
- {\r
- int n;\r
-\r
-\r
- fprintf( stderr, "y=%3d ", ras.span_y );\r
- span = ras.gray_spans;\r
- for ( n = 0; n < count; n++, span++ )\r
- fprintf( stderr, "[%d..%d]:%02x ",\r
- span->x, span->x + span->len - 1, span->coverage );\r
- fprintf( stderr, "\n" );\r
- }\r
-\r
-#endif /* DEBUG_GRAYS */\r
-\r
- ras.num_gray_spans = 0;\r
- ras.span_y = y;\r
-\r
- count = 0;\r
- span = ras.gray_spans;\r
- }\r
- else\r
- span++;\r
-\r
- /* add a gray span to the current list */\r
- span->x = (short)x;\r
- span->len = (unsigned short)acount;\r
- span->coverage = (unsigned char)coverage;\r
-\r
- ras.num_gray_spans++;\r
- }\r
- }\r
-\r
-\r
-#ifdef DEBUG_GRAYS\r
-\r
- /* to be called while in the debugger */\r
- gray_dump_cells( RAS_ARG )\r
- {\r
- int yindex;\r
-\r
-\r
- for ( yindex = 0; yindex < ras.ycount; yindex++ )\r
- {\r
- PCell cell;\r
-\r
-\r
- printf( "%3d:", yindex );\r
-\r
- for ( cell = ras.ycells[yindex]; cell != NULL; cell = cell->next )\r
- printf( " (%3d, c:%4d, a:%6d)", cell->x, cell->cover, cell->area );\r
- printf( "\n" );\r
- }\r
- }\r
-\r
-#endif /* DEBUG_GRAYS */\r
-\r
-\r
- static void\r
- gray_sweep( RAS_ARG_ const FT_Bitmap* target )\r
- {\r
- int yindex;\r
-\r
- FT_UNUSED( target );\r
-\r
-\r
- if ( ras.num_cells == 0 )\r
- return;\r
-\r
- ras.num_gray_spans = 0;\r
-\r
- for ( yindex = 0; yindex < ras.ycount; yindex++ )\r
- {\r
- PCell cell = ras.ycells[yindex];\r
- TCoord cover = 0;\r
- TCoord x = 0;\r
-\r
-\r
- for ( ; cell != NULL; cell = cell->next )\r
- {\r
- TArea area;\r
-\r
-\r
- if ( cell->x > x && cover != 0 )\r
- gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),\r
- cell->x - x );\r
-\r
- cover += cell->cover;\r
- area = cover * ( ONE_PIXEL * 2 ) - cell->area;\r
-\r
- if ( area != 0 && cell->x >= 0 )\r
- gray_hline( RAS_VAR_ cell->x, yindex, area, 1 );\r
-\r
- x = cell->x + 1;\r
- }\r
-\r
- if ( cover != 0 )\r
- gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),\r
- ras.count_ex - x );\r
- }\r
-\r
- if ( ras.render_span && ras.num_gray_spans > 0 )\r
- ras.render_span( ras.span_y, ras.num_gray_spans,\r
- ras.gray_spans, ras.render_span_data );\r
- }\r
-\r
-\r
-#ifdef _STANDALONE_\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* The following function should only compile in stand_alone mode, */\r
- /* i.e., when building this component without the rest of FreeType. */\r
- /* */\r
- /*************************************************************************/\r
-\r
- /*************************************************************************/\r
- /* */\r
- /* <Function> */\r
- /* FT_Outline_Decompose */\r
- /* */\r
- /* <Description> */\r
- /* Walks over an outline's structure to decompose it into individual */\r
- /* segments and Bezier arcs. This function is also able to emit */\r
- /* `move to' and `close to' operations to indicate the start and end */\r
- /* of new contours in the outline. */\r
- /* */\r
- /* <Input> */\r
- /* outline :: A pointer to the source target. */\r
- /* */\r
- /* func_interface :: A table of `emitters', i.e,. function pointers */\r
- /* called during decomposition to indicate path */\r
- /* operations. */\r
- /* */\r
- /* user :: A typeless pointer which is passed to each */\r
- /* emitter during the decomposition. It can be */\r
- /* used to store the state during the */\r
- /* decomposition. */\r
- /* */\r
- /* <Return> */\r
- /* Error code. 0 means success. */\r
- /* */\r
- static\r
- int FT_Outline_Decompose( const FT_Outline* outline,\r
- const FT_Outline_Funcs* func_interface,\r
- void* user )\r
- {\r
-#undef SCALED\r
-#if 0\r
-#define SCALED( x ) ( ( (x) << shift ) - delta )\r
-#else\r
-#define SCALED( x ) (x)\r
-#endif\r
-\r
- FT_Vector v_last;\r
- FT_Vector v_control;\r
- FT_Vector v_start;\r
-\r
- FT_Vector* point;\r
- FT_Vector* limit;\r
- char* tags;\r
-\r
- int n; /* index of contour in outline */\r
- int first; /* index of first point in contour */\r
- int error;\r
- char tag; /* current point's state */\r
-\r
-#if 0\r
- int shift = func_interface->shift;\r
- TPos delta = func_interface->delta;\r
-#endif\r
-\r
-\r
- first = 0;\r
-\r
- for ( n = 0; n < outline->n_contours; n++ )\r
- {\r
- int last; /* index of last point in contour */\r
-\r
-\r
- last = outline->contours[n];\r
- limit = outline->points + last;\r
-\r
- v_start = outline->points[first];\r
- v_last = outline->points[last];\r
-\r
- v_start.x = SCALED( v_start.x );\r
- v_start.y = SCALED( v_start.y );\r
-\r
- v_last.x = SCALED( v_last.x );\r
- v_last.y = SCALED( v_last.y );\r
-\r
- v_control = v_start;\r
-\r
- point = outline->points + first;\r
- tags = outline->tags + first;\r
- tag = FT_CURVE_TAG( tags[0] );\r
-\r
- /* A contour cannot start with a cubic control point! */\r
- if ( tag == FT_CURVE_TAG_CUBIC )\r
- goto Invalid_Outline;\r
-\r
- /* check first point to determine origin */\r
- if ( tag == FT_CURVE_TAG_CONIC )\r
- {\r
- /* first point is conic control. Yes, this happens. */\r
- if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )\r
- {\r
- /* start at last point if it is on the curve */\r
- v_start = v_last;\r
- limit--;\r
- }\r
- else\r
- {\r
- /* if both first and last points are conic, */\r
- /* start at their middle and record its position */\r
- /* for closure */\r
- v_start.x = ( v_start.x + v_last.x ) / 2;\r
- v_start.y = ( v_start.y + v_last.y ) / 2;\r
-\r
- v_last = v_start;\r
- }\r
- point--;\r
- tags--;\r
- }\r
-\r
- error = func_interface->move_to( &v_start, user );\r
- if ( error )\r
- goto Exit;\r
-\r
- while ( point < limit )\r
- {\r
- point++;\r
- tags++;\r
-\r
- tag = FT_CURVE_TAG( tags[0] );\r
- switch ( tag )\r
- {\r
- case FT_CURVE_TAG_ON: /* emit a single line_to */\r
- {\r
- FT_Vector vec;\r
-\r
-\r
- vec.x = SCALED( point->x );\r
- vec.y = SCALED( point->y );\r
-\r
- error = func_interface->line_to( &vec, user );\r
- if ( error )\r
- goto Exit;\r
- continue;\r
- }\r
-\r
- case FT_CURVE_TAG_CONIC: /* consume conic arcs */\r
- {\r
- v_control.x = SCALED( point->x );\r
- v_control.y = SCALED( point->y );\r
-\r
- Do_Conic:\r
- if ( point < limit )\r
- {\r
- FT_Vector vec;\r
- FT_Vector v_middle;\r
-\r
-\r
- point++;\r
- tags++;\r
- tag = FT_CURVE_TAG( tags[0] );\r
-\r
- vec.x = SCALED( point->x );\r
- vec.y = SCALED( point->y );\r
-\r
- if ( tag == FT_CURVE_TAG_ON )\r
- {\r
- error = func_interface->conic_to( &v_control, &vec,\r
- user );\r
- if ( error )\r
- goto Exit;\r
- continue;\r
- }\r
-\r
- if ( tag != FT_CURVE_TAG_CONIC )\r
- goto Invalid_Outline;\r
-\r
- v_middle.x = ( v_control.x + vec.x ) / 2;\r
- v_middle.y = ( v_control.y + vec.y ) / 2;\r
-\r
- error = func_interface->conic_to( &v_control, &v_middle,\r
- user );\r
- if ( error )\r
- goto Exit;\r
-\r
- v_control = vec;\r
- goto Do_Conic;\r
- }\r
-\r
- error = func_interface->conic_to( &v_control, &v_start,\r
- user );\r
- goto Close;\r
- }\r
-\r
- default: /* FT_CURVE_TAG_CUBIC */\r
- {\r
- FT_Vector vec1, vec2;\r
-\r
-\r
- if ( point + 1 > limit ||\r
- FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )\r
- goto Invalid_Outline;\r
-\r
- point += 2;\r
- tags += 2;\r
-\r
- vec1.x = SCALED( point[-2].x );\r
- vec1.y = SCALED( point[-2].y );\r
-\r
- vec2.x = SCALED( point[-1].x );\r
- vec2.y = SCALED( point[-1].y );\r
-\r
- if ( point <= limit )\r
- {\r
- FT_Vector vec;\r
-\r
-\r
- vec.x = SCALED( point->x );\r
- vec.y = SCALED( point->y );\r
-\r
- error = func_interface->cubic_to( &vec1, &vec2, &vec, user );\r
- if ( error )\r
- goto Exit;\r
- continue;\r
- }\r
-\r
- error = func_interface->cubic_to( &vec1, &vec2, &v_start, user );\r
- goto Close;\r
- }\r
- }\r
- }\r
-\r
- /* close the contour with a line segment */\r
- error = func_interface->line_to( &v_start, user );\r
-\r
- Close:\r
- if ( error )\r
- goto Exit;\r
-\r
- first = last + 1;\r
- }\r
-\r
- return 0;\r
-\r
- Exit:\r
- return error;\r
-\r
- Invalid_Outline:\r
- return ErrRaster_Invalid_Outline;\r
- }\r
-\r
-#endif /* _STANDALONE_ */\r
-\r
-\r
- typedef struct TBand_\r
- {\r
- TPos min, max;\r
-\r
- } TBand;\r
-\r
-\r
- static int\r
- gray_convert_glyph_inner( RAS_ARG )\r
- {\r
- static\r
- const FT_Outline_Funcs func_interface =\r
- {\r
- (FT_Outline_MoveTo_Func) gray_move_to,\r
- (FT_Outline_LineTo_Func) gray_line_to,\r
- (FT_Outline_ConicTo_Func)gray_conic_to,\r
- (FT_Outline_CubicTo_Func)gray_cubic_to,\r
- 0,\r
- 0\r
- };\r
-\r
- volatile int error = 0;\r
-\r
- if ( ft_setjmp( ras.jump_buffer ) == 0 )\r
- {\r
- error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );\r
- gray_record_cell( RAS_VAR );\r
- }\r
- else\r
- {\r
- error = ErrRaster_Memory_Overflow;\r
- }\r
-\r
- return error;\r
- }\r
-\r
-\r
- static int\r
- gray_convert_glyph( RAS_ARG )\r
- {\r
- TBand bands[40];\r
- TBand* volatile band;\r
- int volatile n, num_bands;\r
- TPos volatile min, max, max_y;\r
- FT_BBox* clip;\r
-\r
-\r
- /* Set up state in the raster object */\r
- gray_compute_cbox( RAS_VAR );\r
-\r
- /* clip to target bitmap, exit if nothing to do */\r
- clip = &ras.clip_box;\r
-\r
- if ( ras.max_ex <= clip->xMin || ras.min_ex >= clip->xMax ||\r
- ras.max_ey <= clip->yMin || ras.min_ey >= clip->yMax )\r
- return 0;\r
-\r
- if ( ras.min_ex < clip->xMin ) ras.min_ex = clip->xMin;\r
- if ( ras.min_ey < clip->yMin ) ras.min_ey = clip->yMin;\r
-\r
- if ( ras.max_ex > clip->xMax ) ras.max_ex = clip->xMax;\r
- if ( ras.max_ey > clip->yMax ) ras.max_ey = clip->yMax;\r
-\r
- ras.count_ex = ras.max_ex - ras.min_ex;\r
- ras.count_ey = ras.max_ey - ras.min_ey;\r
-\r
- /* simple heuristic used to speed-up the bezier decomposition -- see */\r
- /* the code in gray_render_conic() and gray_render_cubic() for more */\r
- /* details */\r
- ras.conic_level = 32;\r
- ras.cubic_level = 16;\r
-\r
- {\r
- int level = 0;\r
-\r
-\r
- if ( ras.count_ex > 24 || ras.count_ey > 24 )\r
- level++;\r
- if ( ras.count_ex > 120 || ras.count_ey > 120 )\r
- level++;\r
-\r
- ras.conic_level <<= level;\r
- ras.cubic_level <<= level;\r
- }\r
-\r
- /* setup vertical bands */\r
- num_bands = (int)( ( ras.max_ey - ras.min_ey ) / ras.band_size );\r
- if ( num_bands == 0 ) num_bands = 1;\r
- if ( num_bands >= 39 ) num_bands = 39;\r
-\r
- ras.band_shoot = 0;\r
-\r
- min = ras.min_ey;\r
- max_y = ras.max_ey;\r
-\r
- for ( n = 0; n < num_bands; n++, min = max )\r
- {\r
- max = min + ras.band_size;\r
- if ( n == num_bands - 1 || max > max_y )\r
- max = max_y;\r
-\r
- bands[0].min = min;\r
- bands[0].max = max;\r
- band = bands;\r
-\r
- while ( band >= bands )\r
- {\r
- TPos bottom, top, middle;\r
- int error;\r
-\r
- {\r
- PCell cells_max;\r
- int yindex;\r
- long cell_start, cell_end, cell_mod;\r
-\r
-\r
- ras.ycells = (PCell*)ras.buffer;\r
- ras.ycount = band->max - band->min;\r
-\r
- cell_start = sizeof ( PCell ) * ras.ycount;\r
- cell_mod = cell_start % sizeof ( TCell );\r
- if ( cell_mod > 0 )\r
- cell_start += sizeof ( TCell ) - cell_mod;\r
-\r
- cell_end = ras.buffer_size;\r
- cell_end -= cell_end % sizeof( TCell );\r
-\r
- cells_max = (PCell)( (char*)ras.buffer + cell_end );\r
- ras.cells = (PCell)( (char*)ras.buffer + cell_start );\r
- if ( ras.cells >= cells_max )\r
- goto ReduceBands;\r
-\r
- ras.max_cells = cells_max - ras.cells;\r
- if ( ras.max_cells < 2 )\r
- goto ReduceBands;\r
-\r
- for ( yindex = 0; yindex < ras.ycount; yindex++ )\r
- ras.ycells[yindex] = NULL;\r
- }\r
-\r
- ras.num_cells = 0;\r
- ras.invalid = 1;\r
- ras.min_ey = band->min;\r
- ras.max_ey = band->max;\r
- ras.count_ey = band->max - band->min;\r
-\r
- error = gray_convert_glyph_inner( RAS_VAR );\r
-\r
- if ( !error )\r
- {\r
- gray_sweep( RAS_VAR_ &ras.target );\r
- band--;\r
- continue;\r
- }\r
- else if ( error != ErrRaster_Memory_Overflow )\r
- return 1;\r
-\r
- ReduceBands:\r
- /* render pool overflow; we will reduce the render band by half */\r
- bottom = band->min;\r
- top = band->max;\r
- middle = bottom + ( ( top - bottom ) >> 1 );\r
-\r
- /* This is too complex for a single scanline; there must */\r
- /* be some problems. */\r
- if ( middle == bottom )\r
- {\r
-#ifdef DEBUG_GRAYS\r
- fprintf( stderr, "Rotten glyph!\n" );\r
-#endif\r
- return 1;\r
- }\r
-\r
- if ( bottom-top >= ras.band_size )\r
- ras.band_shoot++;\r
-\r
- band[1].min = bottom;\r
- band[1].max = middle;\r
- band[0].min = middle;\r
- band[0].max = top;\r
- band++;\r
- }\r
- }\r
-\r
- if ( ras.band_shoot > 8 && ras.band_size > 16 )\r
- ras.band_size = ras.band_size / 2;\r
-\r
- return 0;\r
- }\r
-\r
-\r
- static int\r
- gray_raster_render( PRaster raster,\r
- const FT_Raster_Params* params )\r
- {\r
- const FT_Outline* outline = (const FT_Outline*)params->source;\r
- const FT_Bitmap* target_map = params->target;\r
- PWorker worker;\r
-\r
-\r
- if ( !raster || !raster->buffer || !raster->buffer_size )\r
- return ErrRaster_Invalid_Argument;\r
-\r
- /* return immediately if the outline is empty */\r
- if ( outline->n_points == 0 || outline->n_contours <= 0 )\r
- return 0;\r
-\r
- if ( !outline || !outline->contours || !outline->points )\r
- return ErrRaster_Invalid_Outline;\r
-\r
- if ( outline->n_points !=\r
- outline->contours[outline->n_contours - 1] + 1 )\r
- return ErrRaster_Invalid_Outline;\r
-\r
- worker = raster->worker;\r
-\r
- /* if direct mode is not set, we must have a target bitmap */\r
- if ( ( params->flags & FT_RASTER_FLAG_DIRECT ) == 0 )\r
- {\r
- if ( !target_map )\r
- return ErrRaster_Invalid_Argument;\r
-\r
- /* nothing to do */\r
- if ( !target_map->width || !target_map->rows )\r
- return 0;\r
-\r
- if ( !target_map->buffer )\r
- return ErrRaster_Invalid_Argument;\r
- }\r
-\r
- /* this version does not support monochrome rendering */\r
- if ( !( params->flags & FT_RASTER_FLAG_AA ) )\r
- return ErrRaster_Invalid_Mode;\r
-\r
- /* compute clipping box */\r
- if ( ( params->flags & FT_RASTER_FLAG_DIRECT ) == 0 )\r
- {\r
- /* compute clip box from target pixmap */\r
- ras.clip_box.xMin = 0;\r
- ras.clip_box.yMin = 0;\r
- ras.clip_box.xMax = target_map->width;\r
- ras.clip_box.yMax = target_map->rows;\r
- }\r
- else if ( params->flags & FT_RASTER_FLAG_CLIP )\r
- {\r
- ras.clip_box = params->clip_box;\r
- }\r
- else\r
- {\r
- ras.clip_box.xMin = -32768L;\r
- ras.clip_box.yMin = -32768L;\r
- ras.clip_box.xMax = 32767L;\r
- ras.clip_box.yMax = 32767L;\r
- }\r
-\r
- gray_init_cells( worker, raster->buffer, raster->buffer_size );\r
-\r
- ras.outline = *outline;\r
- ras.num_cells = 0;\r
- ras.invalid = 1;\r
- ras.band_size = raster->band_size;\r
- ras.num_gray_spans = 0;\r
-\r
- if ( target_map )\r
- ras.target = *target_map;\r
-\r
- ras.render_span = (FT_Raster_Span_Func)gray_render_span;\r
- ras.render_span_data = &ras;\r
-\r
- if ( params->flags & FT_RASTER_FLAG_DIRECT )\r
- {\r
- ras.render_span = (FT_Raster_Span_Func)params->gray_spans;\r
- ras.render_span_data = params->user;\r
- }\r
-\r
- return gray_convert_glyph( worker );\r
- }\r
-\r
-\r
- /**** RASTER OBJECT CREATION: In standalone mode, we simply use *****/\r
- /**** a static object. *****/\r
-\r
-#ifdef _STANDALONE_\r
-\r
- static int\r
- gray_raster_new( void* memory,\r
- FT_Raster* araster )\r
- {\r
- static TRaster the_raster;\r
-\r
- FT_UNUSED( memory );\r
-\r
-\r
- *araster = (FT_Raster)&the_raster;\r
- FT_MEM_ZERO( &the_raster, sizeof ( the_raster ) );\r
-\r
- return 0;\r
- }\r
-\r
-\r
- static void\r
- gray_raster_done( FT_Raster raster )\r
- {\r
- /* nothing */\r
- FT_UNUSED( raster );\r
- }\r
-\r
-#else /* _STANDALONE_ */\r
-\r
- static int\r
- gray_raster_new( FT_Memory memory,\r
- FT_Raster* araster )\r
- {\r
- FT_Error error;\r
- PRaster raster;\r
-\r
-\r
- *araster = 0;\r
- if ( !FT_ALLOC( raster, sizeof ( TRaster ) ) )\r
- {\r
- raster->memory = memory;\r
- *araster = (FT_Raster)raster;\r
- }\r
-\r
- return error;\r
- }\r
-\r
-\r
- static void\r
- gray_raster_done( FT_Raster raster )\r
- {\r
- FT_Memory memory = (FT_Memory)((PRaster)raster)->memory;\r
-\r
-\r
- FT_FREE( raster );\r
- }\r
-\r
-#endif /* _STANDALONE_ */\r
-\r
-\r
- static void\r
- gray_raster_reset( FT_Raster raster,\r
- char* pool_base,\r
- long pool_size )\r
- {\r
- PRaster rast = (PRaster)raster;\r
-\r
-\r
- if ( raster )\r
- {\r
- if ( pool_base && pool_size >= (long)sizeof ( TWorker ) + 2048 )\r
- {\r
- PWorker worker = (PWorker)pool_base;\r
-\r
-\r
- rast->worker = worker;\r
- rast->buffer = pool_base +\r
- ( ( sizeof ( TWorker ) + sizeof ( TCell ) - 1 ) &\r
- ~( sizeof ( TCell ) - 1 ) );\r
- rast->buffer_size = (long)( ( pool_base + pool_size ) -\r
- (char*)rast->buffer ) &\r
- ~( sizeof ( TCell ) - 1 );\r
- rast->band_size = (int)( rast->buffer_size /\r
- ( sizeof ( TCell ) * 8 ) );\r
- }\r
- else\r
- {\r
- rast->buffer = NULL;\r
- rast->buffer_size = 0;\r
- rast->worker = NULL;\r
- }\r
- }\r
- }\r
-\r
-\r
- const FT_Raster_Funcs ft_grays_raster =\r
- {\r
- FT_GLYPH_FORMAT_OUTLINE,\r
-\r
- (FT_Raster_New_Func) gray_raster_new,\r
- (FT_Raster_Reset_Func) gray_raster_reset,\r
- (FT_Raster_Set_Mode_Func)0,\r
- (FT_Raster_Render_Func) gray_raster_render,\r
- (FT_Raster_Done_Func) gray_raster_done\r
- };\r
-\r
-\r
-/* END */\r
+/***************************************************************************/
+/* */
+/* ftgrays.c */
+/* */
+/* A new `perfect' anti-aliasing renderer (body). */
+/* */
+/* Copyright 2000-2001, 2002, 2003, 2005, 2006, 2007 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+ /*************************************************************************/
+ /* */
+ /* This file can be compiled without the rest of the FreeType engine, by */
+ /* defining the _STANDALONE_ macro when compiling it. You also need to */
+ /* put the files `ftgrays.h' and `ftimage.h' into the current */
+ /* compilation directory. Typically, you could do something like */
+ /* */
+ /* - copy `src/smooth/ftgrays.c' (this file) to your current directory */
+ /* */
+ /* - copy `include/freetype/ftimage.h' and `src/smooth/ftgrays.h' to the */
+ /* same directory */
+ /* */
+ /* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */
+ /* */
+ /* cc -c -D_STANDALONE_ ftgrays.c */
+ /* */
+ /* The renderer can be initialized with a call to */
+ /* `ft_gray_raster.raster_new'; an anti-aliased bitmap can be generated */
+ /* with a call to `ft_gray_raster.raster_render'. */
+ /* */
+ /* See the comments and documentation in the file `ftimage.h' for more */
+ /* details on how the raster works. */
+ /* */
+ /*************************************************************************/
+
+ /*************************************************************************/
+ /* */
+ /* This is a new anti-aliasing scan-converter for FreeType 2. The */
+ /* algorithm used here is _very_ different from the one in the standard */
+ /* `ftraster' module. Actually, `ftgrays' computes the _exact_ */
+ /* coverage of the outline on each pixel cell. */
+ /* */
+ /* It is based on ideas that I initially found in Raph Levien's */
+ /* excellent LibArt graphics library (see http://www.levien.com/libart */
+ /* for more information, though the web pages do not tell anything */
+ /* about the renderer; you'll have to dive into the source code to */
+ /* understand how it works). */
+ /* */
+ /* Note, however, that this is a _very_ different implementation */
+ /* compared to Raph's. Coverage information is stored in a very */
+ /* different way, and I don't use sorted vector paths. Also, it doesn't */
+ /* use floating point values. */
+ /* */
+ /* This renderer has the following advantages: */
+ /* */
+ /* - It doesn't need an intermediate bitmap. Instead, one can supply a */
+ /* callback function that will be called by the renderer to draw gray */
+ /* spans on any target surface. You can thus do direct composition on */
+ /* any kind of bitmap, provided that you give the renderer the right */
+ /* callback. */
+ /* */
+ /* - A perfect anti-aliaser, i.e., it computes the _exact_ coverage on */
+ /* each pixel cell. */
+ /* */
+ /* - It performs a single pass on the outline (the `standard' FT2 */
+ /* renderer makes two passes). */
+ /* */
+ /* - It can easily be modified to render to _any_ number of gray levels */
+ /* cheaply. */
+ /* */
+ /* - For small (< 20) pixel sizes, it is faster than the standard */
+ /* renderer. */
+ /* */
+ /*************************************************************************/
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_smooth
+
+
+
+
+#ifdef _STANDALONE_
+
+#include <string.h> /* for ft_memcpy() */
+#include <setjmp.h>
+#include <limits.h>
+#define FT_UINT_MAX UINT_MAX
+
+#define ft_memset memset
+
+#define ft_setjmp setjmp
+#define ft_longjmp longjmp
+#define ft_jmp_buf jmp_buf
+
+
+#define ErrRaster_Invalid_Mode -2
+#define ErrRaster_Invalid_Outline -1
+#define ErrRaster_Invalid_Argument -3
+#define ErrRaster_Memory_Overflow -4
+
+#define FT_BEGIN_HEADER
+#define FT_END_HEADER
+
+#include "ftimage.h"
+#include "ftgrays.h"
+
+ /* This macro is used to indicate that a function parameter is unused. */
+ /* Its purpose is simply to reduce compiler warnings. Note also that */
+ /* simply defining it as `(void)x' doesn't avoid warnings with certain */
+ /* ANSI compilers (e.g. LCC). */
+#define FT_UNUSED( x ) (x) = (x)
+
+ /* Disable the tracing mechanism for simplicity -- developers can */
+ /* activate it easily by redefining these two macros. */
+#ifndef FT_ERROR
+#define FT_ERROR( x ) do ; while ( 0 ) /* nothing */
+#endif
+
+#ifndef FT_TRACE
+#define FT_TRACE( x ) do ; while ( 0 ) /* nothing */
+#endif
+
+#else /* !_STANDALONE_ */
+
+#include <ft2build.h>
+#include "ftgrays.h"
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+#include FT_OUTLINE_H
+
+#include "ftsmerrs.h"
+
+#define ErrRaster_Invalid_Mode Smooth_Err_Cannot_Render_Glyph
+#define ErrRaster_Invalid_Outline Smooth_Err_Invalid_Outline
+#define ErrRaster_Memory_Overflow Smooth_Err_Out_Of_Memory
+#define ErrRaster_Invalid_Argument Smooth_Err_Bad_Argument
+
+#endif /* !_STANDALONE_ */
+
+
+#ifndef FT_MEM_SET
+#define FT_MEM_SET( d, s, c ) ft_memset( d, s, c )
+#endif
+
+#ifndef FT_MEM_ZERO
+#define FT_MEM_ZERO( dest, count ) FT_MEM_SET( dest, 0, count )
+#endif
+
+ /* define this to dump debugging information */
+#define xxxDEBUG_GRAYS
+
+
+ /* as usual, for the speed hungry :-) */
+
+#ifndef FT_STATIC_RASTER
+
+
+#define RAS_ARG PWorker worker
+#define RAS_ARG_ PWorker worker,
+
+#define RAS_VAR worker
+#define RAS_VAR_ worker,
+
+#define ras (*worker)
+
+
+#else /* FT_STATIC_RASTER */
+
+
+#define RAS_ARG /* empty */
+#define RAS_ARG_ /* empty */
+#define RAS_VAR /* empty */
+#define RAS_VAR_ /* empty */
+
+ static TWorker ras;
+
+
+#endif /* FT_STATIC_RASTER */
+
+
+ /* must be at least 6 bits! */
+#define PIXEL_BITS 8
+
+#define ONE_PIXEL ( 1L << PIXEL_BITS )
+#define PIXEL_MASK ( -1L << PIXEL_BITS )
+#define TRUNC( x ) ( (TCoord)( (x) >> PIXEL_BITS ) )
+#define SUBPIXELS( x ) ( (TPos)(x) << PIXEL_BITS )
+#define FLOOR( x ) ( (x) & -ONE_PIXEL )
+#define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL )
+#define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL )
+
+#if PIXEL_BITS >= 6
+#define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) )
+#define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) )
+#else
+#define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) )
+#define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) )
+#endif
+
+
+ /*************************************************************************/
+ /* */
+ /* TYPE DEFINITIONS */
+ /* */
+
+ /* don't change the following types to FT_Int or FT_Pos, since we might */
+ /* need to define them to "float" or "double" when experimenting with */
+ /* new algorithms */
+
+ typedef int TCoord; /* integer scanline/pixel coordinate */
+ typedef long TPos; /* sub-pixel coordinate */
+
+ /* determine the type used to store cell areas. This normally takes at */
+ /* least PIXEL_BITS*2 + 1 bits. On 16-bit systems, we need to use */
+ /* `long' instead of `int', otherwise bad things happen */
+
+#if PIXEL_BITS <= 7
+
+ typedef int TArea;
+
+#else /* PIXEL_BITS >= 8 */
+
+ /* approximately determine the size of integers using an ANSI-C header */
+#if FT_UINT_MAX == 0xFFFFU
+ typedef long TArea;
+#else
+ typedef int TArea;
+#endif
+
+#endif /* PIXEL_BITS >= 8 */
+
+
+ /* maximal number of gray spans in a call to the span callback */
+#define FT_MAX_GRAY_SPANS 32
+
+
+ typedef struct TCell_* PCell;
+
+ typedef struct TCell_
+ {
+ int x;
+ int cover;
+ TArea area;
+ PCell next;
+
+ } TCell;
+
+
+ typedef struct TWorker_
+ {
+ TCoord ex, ey;
+ TPos min_ex, max_ex;
+ TPos min_ey, max_ey;
+ TPos count_ex, count_ey;
+
+ TArea area;
+ int cover;
+ int invalid;
+
+ PCell cells;
+ int max_cells;
+ int num_cells;
+
+ TCoord cx, cy;
+ TPos x, y;
+
+ TPos last_ey;
+
+ FT_Vector bez_stack[32 * 3 + 1];
+ int lev_stack[32];
+
+ FT_Outline outline;
+ FT_Bitmap target;
+ FT_BBox clip_box;
+
+ FT_Span gray_spans[FT_MAX_GRAY_SPANS];
+ int num_gray_spans;
+
+ FT_Raster_Span_Func render_span;
+ void* render_span_data;
+ int span_y;
+
+ int band_size;
+ int band_shoot;
+ int conic_level;
+ int cubic_level;
+
+ ft_jmp_buf jump_buffer;
+
+ void* buffer;
+ long buffer_size;
+
+ PCell* ycells;
+ int ycount;
+
+ } TWorker, *PWorker;
+
+
+ typedef struct TRaster_
+ {
+ void* buffer;
+ long buffer_size;
+ int band_size;
+ void* memory;
+ PWorker worker;
+
+ } TRaster, *PRaster;
+
+
+
+ /*************************************************************************/
+ /* */
+ /* Initialize the cells table. */
+ /* */
+ static void
+ gray_init_cells( RAS_ARG_ void* buffer,
+ long byte_size )
+ {
+ ras.buffer = buffer;
+ ras.buffer_size = byte_size;
+
+ ras.ycells = (PCell*) buffer;
+ ras.cells = NULL;
+ ras.max_cells = 0;
+ ras.num_cells = 0;
+ ras.area = 0;
+ ras.cover = 0;
+ ras.invalid = 1;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Compute the outline bounding box. */
+ /* */
+ static void
+ gray_compute_cbox( RAS_ARG )
+ {
+ FT_Outline* outline = &ras.outline;
+ FT_Vector* vec = outline->points;
+ FT_Vector* limit = vec + outline->n_points;
+
+
+ if ( outline->n_points <= 0 )
+ {
+ ras.min_ex = ras.max_ex = 0;
+ ras.min_ey = ras.max_ey = 0;
+ return;
+ }
+
+ ras.min_ex = ras.max_ex = vec->x;
+ ras.min_ey = ras.max_ey = vec->y;
+
+ vec++;
+
+ for ( ; vec < limit; vec++ )
+ {
+ TPos x = vec->x;
+ TPos y = vec->y;
+
+
+ if ( x < ras.min_ex ) ras.min_ex = x;
+ if ( x > ras.max_ex ) ras.max_ex = x;
+ if ( y < ras.min_ey ) ras.min_ey = y;
+ if ( y > ras.max_ey ) ras.max_ey = y;
+ }
+
+ /* truncate the bounding box to integer pixels */
+ ras.min_ex = ras.min_ex >> 6;
+ ras.min_ey = ras.min_ey >> 6;
+ ras.max_ex = ( ras.max_ex + 63 ) >> 6;
+ ras.max_ey = ( ras.max_ey + 63 ) >> 6;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Record the current cell in the table. */
+ /* */
+ static PCell
+ gray_find_cell( RAS_ARG )
+ {
+ PCell *pcell, cell;
+ int x = ras.ex;
+
+
+ if ( x > ras.max_ex )
+ x = ras.max_ex;
+
+ pcell = &ras.ycells[ras.ey];
+ for (;;)
+ {
+ cell = *pcell;
+ if ( cell == NULL || cell->x > x )
+ break;
+
+ if ( cell->x == x )
+ goto Exit;
+
+ pcell = &cell->next;
+ }
+
+ if ( ras.num_cells >= ras.max_cells )
+ ft_longjmp( ras.jump_buffer, 1 );
+
+ cell = ras.cells + ras.num_cells++;
+ cell->x = x;
+ cell->area = 0;
+ cell->cover = 0;
+
+ cell->next = *pcell;
+ *pcell = cell;
+
+ Exit:
+ return cell;
+ }
+
+
+ static void
+ gray_record_cell( RAS_ARG )
+ {
+ if ( !ras.invalid && ( ras.area | ras.cover ) )
+ {
+ PCell cell = gray_find_cell( RAS_VAR );
+
+
+ cell->area += ras.area;
+ cell->cover += ras.cover;
+ }
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Set the current cell to a new position. */
+ /* */
+ static void
+ gray_set_cell( RAS_ARG_ TCoord ex,
+ TCoord ey )
+ {
+ /* Move the cell pointer to a new position. We set the `invalid' */
+ /* flag to indicate that the cell isn't part of those we're interested */
+ /* in during the render phase. This means that: */
+ /* */
+ /* . the new vertical position must be within min_ey..max_ey-1. */
+ /* . the new horizontal position must be strictly less than max_ex */
+ /* */
+ /* Note that if a cell is to the left of the clipping region, it is */
+ /* actually set to the (min_ex-1) horizontal position. */
+
+ /* All cells that are on the left of the clipping region go to the */
+ /* min_ex - 1 horizontal position. */
+ ey -= ras.min_ey;
+
+ if ( ex > ras.max_ex )
+ ex = ras.max_ex;
+
+ ex -= ras.min_ex;
+ if ( ex < 0 )
+ ex = -1;
+
+ /* are we moving to a different cell ? */
+ if ( ex != ras.ex || ey != ras.ey )
+ {
+ /* record the current one if it is valid */
+ if ( !ras.invalid )
+ gray_record_cell( RAS_VAR );
+
+ ras.area = 0;
+ ras.cover = 0;
+ }
+
+ ras.ex = ex;
+ ras.ey = ey;
+ ras.invalid = ( (unsigned)ey >= (unsigned)ras.count_ey ||
+ ex >= ras.count_ex );
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Start a new contour at a given cell. */
+ /* */
+ static void
+ gray_start_cell( RAS_ARG_ TCoord ex,
+ TCoord ey )
+ {
+ if ( ex > ras.max_ex )
+ ex = (TCoord)( ras.max_ex );
+
+ if ( ex < ras.min_ex )
+ ex = (TCoord)( ras.min_ex - 1 );
+
+ ras.area = 0;
+ ras.cover = 0;
+ ras.ex = ex - ras.min_ex;
+ ras.ey = ey - ras.min_ey;
+ ras.last_ey = SUBPIXELS( ey );
+ ras.invalid = 0;
+
+ gray_set_cell( RAS_VAR_ ex, ey );
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Render a scanline as one or more cells. */
+ /* */
+ static void
+ gray_render_scanline( RAS_ARG_ TCoord ey,
+ TPos x1,
+ TCoord y1,
+ TPos x2,
+ TCoord y2 )
+ {
+ TCoord ex1, ex2, fx1, fx2, delta;
+ long p, first, dx;
+ int incr, lift, mod, rem;
+
+
+ dx = x2 - x1;
+
+ ex1 = TRUNC( x1 );
+ ex2 = TRUNC( x2 );
+ fx1 = (TCoord)( x1 - SUBPIXELS( ex1 ) );
+ fx2 = (TCoord)( x2 - SUBPIXELS( ex2 ) );
+
+ /* trivial case. Happens often */
+ if ( y1 == y2 )
+ {
+ gray_set_cell( RAS_VAR_ ex2, ey );
+ return;
+ }
+
+ /* everything is located in a single cell. That is easy! */
+ /* */
+ if ( ex1 == ex2 )
+ {
+ delta = y2 - y1;
+ ras.area += (TArea)( fx1 + fx2 ) * delta;
+ ras.cover += delta;
+ return;
+ }
+
+ /* ok, we'll have to render a run of adjacent cells on the same */
+ /* scanline... */
+ /* */
+ p = ( ONE_PIXEL - fx1 ) * ( y2 - y1 );
+ first = ONE_PIXEL;
+ incr = 1;
+
+ if ( dx < 0 )
+ {
+ p = fx1 * ( y2 - y1 );
+ first = 0;
+ incr = -1;
+ dx = -dx;
+ }
+
+ delta = (TCoord)( p / dx );
+ mod = (TCoord)( p % dx );
+ if ( mod < 0 )
+ {
+ delta--;
+ mod += (TCoord)dx;
+ }
+
+ ras.area += (TArea)( fx1 + first ) * delta;
+ ras.cover += delta;
+
+ ex1 += incr;
+ gray_set_cell( RAS_VAR_ ex1, ey );
+ y1 += delta;
+
+ if ( ex1 != ex2 )
+ {
+ p = ONE_PIXEL * ( y2 - y1 + delta );
+ lift = (TCoord)( p / dx );
+ rem = (TCoord)( p % dx );
+ if ( rem < 0 )
+ {
+ lift--;
+ rem += (TCoord)dx;
+ }
+
+ mod -= (int)dx;
+
+ while ( ex1 != ex2 )
+ {
+ delta = lift;
+ mod += rem;
+ if ( mod >= 0 )
+ {
+ mod -= (TCoord)dx;
+ delta++;
+ }
+
+ ras.area += (TArea)ONE_PIXEL * delta;
+ ras.cover += delta;
+ y1 += delta;
+ ex1 += incr;
+ gray_set_cell( RAS_VAR_ ex1, ey );
+ }
+ }
+
+ delta = y2 - y1;
+ ras.area += (TArea)( fx2 + ONE_PIXEL - first ) * delta;
+ ras.cover += delta;
+ }
+
+
+ /*************************************************************************/
+ /* */
+ /* Render a given line as a series of scanlines. */
+ /* */
+ static void
+ gray_render_line( RAS_ARG_ TPos to_x,
+ TPos to_y )
+ {
+ TCoord ey1, ey2, fy1, fy2;
+ TPos dx, dy, x, x2;
+ long p, first;
+ int delta, rem, mod, lift, incr;
+
+
+ ey1 = TRUNC( ras.last_ey );
+ ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */
+ fy1 = (TCoord)( ras.y - ras.last_ey );
+ fy2 = (TCoord)( to_y - SUBPIXELS( ey2 ) );
+
+ dx = to_x - ras.x;
+ dy = to_y - ras.y;
+
+ /* XXX: we should do something about the trivial case where dx == 0, */
+ /* as it happens very often! */
+
+ /* perform vertical clipping */
+ {
+ TCoord min, max;
+
+
+ min = ey1;
+ max = ey2;
+ if ( ey1 > ey2 )
+ {
+ min = ey2;
+ max = ey1;
+ }
+ if ( min >= ras.max_ey || max < ras.min_ey )
+ goto End;
+ }
+
+ /* everything is on a single scanline */
+ if ( ey1 == ey2 )
+ {
+ gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 );
+ goto End;
+ }
+
+ /* vertical line - avoid calling gray_render_scanline */
+ incr = 1;
+
+ if ( dx == 0 )
+ {
+ TCoord ex = TRUNC( ras.x );
+ TCoord two_fx = (TCoord)( ( ras.x - SUBPIXELS( ex ) ) << 1 );
+ TPos area;
+
+
+ first = ONE_PIXEL;
+ if ( dy < 0 )
+ {
+ first = 0;
+ incr = -1;
+ }
+
+ delta = (int)( first - fy1 );
+ ras.area += (TArea)two_fx * delta;
+ ras.cover += delta;
+ ey1 += incr;
+
+ gray_set_cell( &ras, ex, ey1 );
+
+ delta = (int)( first + first - ONE_PIXEL );
+ area = (TArea)two_fx * delta;
+ while ( ey1 != ey2 )
+ {
+ ras.area += area;
+ ras.cover += delta;
+ ey1 += incr;
+
+ gray_set_cell( &ras, ex, ey1 );
+ }
+
+ delta = (int)( fy2 - ONE_PIXEL + first );
+ ras.area += (TArea)two_fx * delta;
+ ras.cover += delta;
+
+ goto End;
+ }
+
+ /* ok, we have to render several scanlines */
+ p = ( ONE_PIXEL - fy1 ) * dx;
+ first = ONE_PIXEL;
+ incr = 1;
+
+ if ( dy < 0 )
+ {
+ p = fy1 * dx;
+ first = 0;
+ incr = -1;
+ dy = -dy;
+ }
+
+ delta = (int)( p / dy );
+ mod = (int)( p % dy );
+ if ( mod < 0 )
+ {
+ delta--;
+ mod += (TCoord)dy;
+ }
+
+ x = ras.x + delta;
+ gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, (TCoord)first );
+
+ ey1 += incr;
+ gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
+
+ if ( ey1 != ey2 )
+ {
+ p = ONE_PIXEL * dx;
+ lift = (int)( p / dy );
+ rem = (int)( p % dy );
+ if ( rem < 0 )
+ {
+ lift--;
+ rem += (int)dy;
+ }
+ mod -= (int)dy;
+
+ while ( ey1 != ey2 )
+ {
+ delta = lift;
+ mod += rem;
+ if ( mod >= 0 )
+ {
+ mod -= (int)dy;
+ delta++;
+ }
+
+ x2 = x + delta;
+ gray_render_scanline( RAS_VAR_ ey1, x,
+ (TCoord)( ONE_PIXEL - first ), x2,
+ (TCoord)first );
+ x = x2;
+
+ ey1 += incr;
+ gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 );
+ }
+ }
+
+ gray_render_scanline( RAS_VAR_ ey1, x,
+ (TCoord)( ONE_PIXEL - first ), to_x,
+ fy2 );
+
+ End:
+ ras.x = to_x;
+ ras.y = to_y;
+ ras.last_ey = SUBPIXELS( ey2 );
+ }
+
+
+ static void
+ gray_split_conic( FT_Vector* base )
+ {
+ TPos a, b;
+
+
+ base[4].x = base[2].x;
+ b = base[1].x;
+ a = base[3].x = ( base[2].x + b ) / 2;
+ b = base[1].x = ( base[0].x + b ) / 2;
+ base[2].x = ( a + b ) / 2;
+
+ base[4].y = base[2].y;
+ b = base[1].y;
+ a = base[3].y = ( base[2].y + b ) / 2;
+ b = base[1].y = ( base[0].y + b ) / 2;
+ base[2].y = ( a + b ) / 2;
+ }
+
+
+ static void
+ gray_render_conic( RAS_ARG_ const FT_Vector* control,
+ const FT_Vector* to )
+ {
+ TPos dx, dy;
+ int top, level;
+ int* levels;
+ FT_Vector* arc;
+
+
+ dx = DOWNSCALE( ras.x ) + to->x - ( control->x << 1 );
+ if ( dx < 0 )
+ dx = -dx;
+ dy = DOWNSCALE( ras.y ) + to->y - ( control->y << 1 );
+ if ( dy < 0 )
+ dy = -dy;
+ if ( dx < dy )
+ dx = dy;
+
+ level = 1;
+ dx = dx / ras.conic_level;
+ while ( dx > 0 )
+ {
+ dx >>= 2;
+ level++;
+ }
+
+ /* a shortcut to speed things up */
+ if ( level <= 1 )
+ {
+ /* we compute the mid-point directly in order to avoid */
+ /* calling gray_split_conic() */
+ TPos to_x, to_y, mid_x, mid_y;
+
+
+ to_x = UPSCALE( to->x );
+ to_y = UPSCALE( to->y );
+ mid_x = ( ras.x + to_x + 2 * UPSCALE( control->x ) ) / 4;
+ mid_y = ( ras.y + to_y + 2 * UPSCALE( control->y ) ) / 4;
+
+ gray_render_line( RAS_VAR_ mid_x, mid_y );
+ gray_render_line( RAS_VAR_ to_x, to_y );
+
+ return;
+ }
+
+ arc = ras.bez_stack;
+ levels = ras.lev_stack;
+ top = 0;
+ levels[0] = level;
+
+ arc[0].x = UPSCALE( to->x );
+ arc[0].y = UPSCALE( to->y );
+ arc[1].x = UPSCALE( control->x );
+ arc[1].y = UPSCALE( control->y );
+ arc[2].x = ras.x;
+ arc[2].y = ras.y;
+
+ while ( top >= 0 )
+ {
+ level = levels[top];
+ if ( level > 1 )
+ {
+ /* check that the arc crosses the current band */
+ TPos min, max, y;
+
+
+ min = max = arc[0].y;
+
+ y = arc[1].y;
+ if ( y < min ) min = y;
+ if ( y > max ) max = y;
+
+ y = arc[2].y;
+ if ( y < min ) min = y;
+ if ( y > max ) max = y;
+
+ if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < ras.min_ey )
+ goto Draw;
+
+ gray_split_conic( arc );
+ arc += 2;
+ top++;
+ levels[top] = levels[top - 1] = level - 1;
+ continue;
+ }
+
+ Draw:
+ {
+ TPos to_x, to_y, mid_x, mid_y;
+
+
+ to_x = arc[0].x;
+ to_y = arc[0].y;
+ mid_x = ( ras.x + to_x + 2 * arc[1].x ) / 4;
+ mid_y = ( ras.y + to_y + 2 * arc[1].y ) / 4;
+
+ gray_render_line( RAS_VAR_ mid_x, mid_y );
+ gray_render_line( RAS_VAR_ to_x, to_y );
+
+ top--;
+ arc -= 2;
+ }
+ }
+
+ return;
+ }
+
+
+ static void
+ gray_split_cubic( FT_Vector* base )
+ {
+ TPos a, b, c, d;
+
+
+ base[6].x = base[3].x;
+ c = base[1].x;
+ d = base[2].x;
+ base[1].x = a = ( base[0].x + c ) / 2;
+ base[5].x = b = ( base[3].x + d ) / 2;
+ c = ( c + d ) / 2;
+ base[2].x = a = ( a + c ) / 2;
+ base[4].x = b = ( b + c ) / 2;
+ base[3].x = ( a + b ) / 2;
+
+ base[6].y = base[3].y;
+ c = base[1].y;
+ d = base[2].y;
+ base[1].y = a = ( base[0].y + c ) / 2;
+ base[5].y = b = ( base[3].y + d ) / 2;
+ c = ( c + d ) / 2;
+ base[2].y = a = ( a + c ) / 2;
+ base[4].y = b = ( b + c ) / 2;
+ base[3].y = ( a + b ) / 2;
+ }
+
+
+ static void
+ gray_render_cubic( RAS_ARG_ const FT_Vector* control1,
+ const FT_Vector* control2,
+ const FT_Vector* to )
+ {
+ TPos dx, dy, da, db;
+ int top, level;
+ int* levels;
+ FT_Vector* arc;
+
+
+ dx = DOWNSCALE( ras.x ) + to->x - ( control1->x << 1 );
+ if ( dx < 0 )
+ dx = -dx;
+ dy = DOWNSCALE( ras.y ) + to->y - ( control1->y << 1 );
+ if ( dy < 0 )
+ dy = -dy;
+ if ( dx < dy )
+ dx = dy;
+ da = dx;
+
+ dx = DOWNSCALE( ras.x ) + to->x - 3 * ( control1->x + control2->x );
+ if ( dx < 0 )
+ dx = -dx;
+ dy = DOWNSCALE( ras.y ) + to->y - 3 * ( control1->x + control2->y );
+ if ( dy < 0 )
+ dy = -dy;
+ if ( dx < dy )
+ dx = dy;
+ db = dx;
+
+ level = 1;
+ da = da / ras.cubic_level;
+ db = db / ras.conic_level;
+ while ( da > 0 || db > 0 )
+ {
+ da >>= 2;
+ db >>= 3;
+ level++;
+ }
+
+ if ( level <= 1 )
+ {
+ TPos to_x, to_y, mid_x, mid_y;
+
+
+ to_x = UPSCALE( to->x );
+ to_y = UPSCALE( to->y );
+ mid_x = ( ras.x + to_x +
+ 3 * UPSCALE( control1->x + control2->x ) ) / 8;
+ mid_y = ( ras.y + to_y +
+ 3 * UPSCALE( control1->y + control2->y ) ) / 8;
+
+ gray_render_line( RAS_VAR_ mid_x, mid_y );
+ gray_render_line( RAS_VAR_ to_x, to_y );
+ return;
+ }
+
+ arc = ras.bez_stack;
+ arc[0].x = UPSCALE( to->x );
+ arc[0].y = UPSCALE( to->y );
+ arc[1].x = UPSCALE( control2->x );
+ arc[1].y = UPSCALE( control2->y );
+ arc[2].x = UPSCALE( control1->x );
+ arc[2].y = UPSCALE( control1->y );
+ arc[3].x = ras.x;
+ arc[3].y = ras.y;
+
+ levels = ras.lev_stack;
+ top = 0;
+ levels[0] = level;
+
+ while ( top >= 0 )
+ {
+ level = levels[top];
+ if ( level > 1 )
+ {
+ /* check that the arc crosses the current band */
+ TPos min, max, y;
+
+
+ min = max = arc[0].y;
+ y = arc[1].y;
+ if ( y < min ) min = y;
+ if ( y > max ) max = y;
+ y = arc[2].y;
+ if ( y < min ) min = y;
+ if ( y > max ) max = y;
+ y = arc[3].y;
+ if ( y < min ) min = y;
+ if ( y > max ) max = y;
+ if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < 0 )
+ goto Draw;
+ gray_split_cubic( arc );
+ arc += 3;
+ top ++;
+ levels[top] = levels[top - 1] = level - 1;
+ continue;
+ }
+
+ Draw:
+ {
+ TPos to_x, to_y, mid_x, mid_y;
+
+
+ to_x = arc[0].x;
+ to_y = arc[0].y;
+ mid_x = ( ras.x + to_x + 3 * ( arc[1].x + arc[2].x ) ) / 8;
+ mid_y = ( ras.y + to_y + 3 * ( arc[1].y + arc[2].y ) ) / 8;
+
+ gray_render_line( RAS_VAR_ mid_x, mid_y );
+ gray_render_line( RAS_VAR_ to_x, to_y );
+ top --;
+ arc -= 3;
+ }
+ }
+
+ return;
+ }
+
+
+
+ static int
+ gray_move_to( const FT_Vector* to,
+ PWorker worker )
+ {
+ TPos x, y;
+
+
+ /* record current cell, if any */
+ gray_record_cell( worker );
+
+ /* start to a new position */
+ x = UPSCALE( to->x );
+ y = UPSCALE( to->y );
+
+ gray_start_cell( worker, TRUNC( x ), TRUNC( y ) );
+
+ worker->x = x;
+ worker->y = y;
+ return 0;
+ }
+
+
+ static int
+ gray_line_to( const FT_Vector* to,
+ PWorker worker )
+ {
+ gray_render_line( worker, UPSCALE( to->x ), UPSCALE( to->y ) );
+ return 0;
+ }
+
+
+ static int
+ gray_conic_to( const FT_Vector* control,
+ const FT_Vector* to,
+ PWorker worker )
+ {
+ gray_render_conic( worker, control, to );
+ return 0;
+ }
+
+
+ static int
+ gray_cubic_to( const FT_Vector* control1,
+ const FT_Vector* control2,
+ const FT_Vector* to,
+ PWorker worker )
+ {
+ gray_render_cubic( worker, control1, control2, to );
+ return 0;
+ }
+
+
+ static void
+ gray_render_span( int y,
+ int count,
+ const FT_Span* spans,
+ PWorker worker )
+ {
+ unsigned char* p;
+ FT_Bitmap* map = &worker->target;
+
+
+ /* first of all, compute the scanline offset */
+ p = (unsigned char*)map->buffer - y * map->pitch;
+ if ( map->pitch >= 0 )
+ p += ( map->rows - 1 ) * map->pitch;
+
+ for ( ; count > 0; count--, spans++ )
+ {
+ unsigned char coverage = spans->coverage;
+
+
+ if ( coverage )
+ {
+ /* For small-spans it is faster to do it by ourselves than
+ * calling `memset'. This is mainly due to the cost of the
+ * function call.
+ */
+ if ( spans->len >= 8 )
+ FT_MEM_SET( p + spans->x, (unsigned char)coverage, spans->len );
+ else
+ {
+ unsigned char* q = p + spans->x;
+
+
+ switch ( spans->len )
+ {
+ case 7: *q++ = (unsigned char)coverage;
+ case 6: *q++ = (unsigned char)coverage;
+ case 5: *q++ = (unsigned char)coverage;
+ case 4: *q++ = (unsigned char)coverage;
+ case 3: *q++ = (unsigned char)coverage;
+ case 2: *q++ = (unsigned char)coverage;
+ case 1: *q = (unsigned char)coverage;
+ default:
+ ;
+ }
+ }
+ }
+ }
+ }
+
+
+ static void
+ gray_hline( RAS_ARG_ TCoord x,
+ TCoord y,
+ TPos area,
+ int acount )
+ {
+ FT_Span* span;
+ int count;
+ int coverage;
+
+
+ /* compute the coverage line's coverage, depending on the */
+ /* outline fill rule */
+ /* */
+ /* the coverage percentage is area/(PIXEL_BITS*PIXEL_BITS*2) */
+ /* */
+ coverage = (int)( area >> ( PIXEL_BITS * 2 + 1 - 8 ) );
+ /* use range 0..256 */
+ if ( coverage < 0 )
+ coverage = -coverage;
+
+ if ( ras.outline.flags & FT_OUTLINE_EVEN_ODD_FILL )
+ {
+ coverage &= 511;
+
+ if ( coverage > 256 )
+ coverage = 512 - coverage;
+ else if ( coverage == 256 )
+ coverage = 255;
+ }
+ else
+ {
+ /* normal non-zero winding rule */
+ if ( coverage >= 256 )
+ coverage = 255;
+ }
+
+ y += (TCoord)ras.min_ey;
+ x += (TCoord)ras.min_ex;
+
+ /* FT_Span.x is a 16-bit short, so limit our coordinates appropriately */
+ if ( x >= 32768 )
+ x = 32767;
+
+ if ( coverage )
+ {
+ /* see whether we can add this span to the current list */
+ count = ras.num_gray_spans;
+ span = ras.gray_spans + count - 1;
+ if ( count > 0 &&
+ ras.span_y == y &&
+ (int)span->x + span->len == (int)x &&
+ span->coverage == coverage )
+ {
+ span->len = (unsigned short)( span->len + acount );
+ return;
+ }
+
+ if ( ras.span_y != y || count >= FT_MAX_GRAY_SPANS )
+ {
+ if ( ras.render_span && count > 0 )
+ ras.render_span( ras.span_y, count, ras.gray_spans,
+ ras.render_span_data );
+ /* ras.render_span( span->y, ras.gray_spans, count ); */
+
+#ifdef DEBUG_GRAYS
+
+ if ( ras.span_y >= 0 )
+ {
+ int n;
+
+
+ fprintf( stderr, "y=%3d ", ras.span_y );
+ span = ras.gray_spans;
+ for ( n = 0; n < count; n++, span++ )
+ fprintf( stderr, "[%d..%d]:%02x ",
+ span->x, span->x + span->len - 1, span->coverage );
+ fprintf( stderr, "\n" );
+ }
+
+#endif /* DEBUG_GRAYS */
+
+ ras.num_gray_spans = 0;
+ ras.span_y = y;
+
+ count = 0;
+ span = ras.gray_spans;
+ }
+ else
+ span++;
+
+ /* add a gray span to the current list */
+ span->x = (short)x;
+ span->len = (unsigned short)acount;
+ span->coverage = (unsigned char)coverage;
+
+ ras.num_gray_spans++;
+ }
+ }
+
+
+#ifdef DEBUG_GRAYS
+
+ /* to be called while in the debugger */
+ gray_dump_cells( RAS_ARG )
+ {
+ int yindex;
+
+
+ for ( yindex = 0; yindex < ras.ycount; yindex++ )
+ {
+ PCell cell;
+
+
+ printf( "%3d:", yindex );
+
+ for ( cell = ras.ycells[yindex]; cell != NULL; cell = cell->next )
+ printf( " (%3d, c:%4d, a:%6d)", cell->x, cell->cover, cell->area );
+ printf( "\n" );
+ }
+ }
+
+#endif /* DEBUG_GRAYS */
+
+
+ static void
+ gray_sweep( RAS_ARG_ const FT_Bitmap* target )
+ {
+ int yindex;
+
+ FT_UNUSED( target );
+
+
+ if ( ras.num_cells == 0 )
+ return;
+
+ ras.num_gray_spans = 0;
+
+ for ( yindex = 0; yindex < ras.ycount; yindex++ )
+ {
+ PCell cell = ras.ycells[yindex];
+ TCoord cover = 0;
+ TCoord x = 0;
+
+
+ for ( ; cell != NULL; cell = cell->next )
+ {
+ TArea area;
+
+
+ if ( cell->x > x && cover != 0 )
+ gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
+ cell->x - x );
+
+ cover += cell->cover;
+ area = cover * ( ONE_PIXEL * 2 ) - cell->area;
+
+ if ( area != 0 && cell->x >= 0 )
+ gray_hline( RAS_VAR_ cell->x, yindex, area, 1 );
+
+ x = cell->x + 1;
+ }
+
+ if ( cover != 0 )
+ gray_hline( RAS_VAR_ x, yindex, cover * ( ONE_PIXEL * 2 ),
+ ras.count_ex - x );
+ }
+
+ if ( ras.render_span && ras.num_gray_spans > 0 )
+ ras.render_span( ras.span_y, ras.num_gray_spans,
+ ras.gray_spans, ras.render_span_data );
+ }
+
+
+#ifdef _STANDALONE_
+
+ /*************************************************************************/
+ /* */
+ /* The following function should only compile in stand_alone mode, */
+ /* i.e., when building this component without the rest of FreeType. */
+ /* */
+ /*************************************************************************/
+
+ /*************************************************************************/
+ /* */
+ /* <Function> */
+ /* FT_Outline_Decompose */
+ /* */
+ /* <Description> */
+ /* Walks over an outline's structure to decompose it into individual */
+ /* segments and Bezier arcs. This function is also able to emit */
+ /* `move to' and `close to' operations to indicate the start and end */
+ /* of new contours in the outline. */
+ /* */
+ /* <Input> */
+ /* outline :: A pointer to the source target. */
+ /* */
+ /* func_interface :: A table of `emitters', i.e,. function pointers */
+ /* called during decomposition to indicate path */
+ /* operations. */
+ /* */
+ /* user :: A typeless pointer which is passed to each */
+ /* emitter during the decomposition. It can be */
+ /* used to store the state during the */
+ /* decomposition. */
+ /* */
+ /* <Return> */
+ /* Error code. 0 means success. */
+ /* */
+ static
+ int FT_Outline_Decompose( const FT_Outline* outline,
+ const FT_Outline_Funcs* func_interface,
+ void* user )
+ {
+#undef SCALED
+#if 0
+#define SCALED( x ) ( ( (x) << shift ) - delta )
+#else
+#define SCALED( x ) (x)
+#endif
+
+ FT_Vector v_last;
+ FT_Vector v_control;
+ FT_Vector v_start;
+
+ FT_Vector* point;
+ FT_Vector* limit;
+ char* tags;
+
+ int n; /* index of contour in outline */
+ int first; /* index of first point in contour */
+ int error;
+ char tag; /* current point's state */
+
+#if 0
+ int shift = func_interface->shift;
+ TPos delta = func_interface->delta;
+#endif
+
+
+ first = 0;
+
+ for ( n = 0; n < outline->n_contours; n++ )
+ {
+ int last; /* index of last point in contour */
+
+
+ last = outline->contours[n];
+ limit = outline->points + last;
+
+ v_start = outline->points[first];
+ v_last = outline->points[last];
+
+ v_start.x = SCALED( v_start.x );
+ v_start.y = SCALED( v_start.y );
+
+ v_last.x = SCALED( v_last.x );
+ v_last.y = SCALED( v_last.y );
+
+ v_control = v_start;
+
+ point = outline->points + first;
+ tags = outline->tags + first;
+ tag = FT_CURVE_TAG( tags[0] );
+
+ /* A contour cannot start with a cubic control point! */
+ if ( tag == FT_CURVE_TAG_CUBIC )
+ goto Invalid_Outline;
+
+ /* check first point to determine origin */
+ if ( tag == FT_CURVE_TAG_CONIC )
+ {
+ /* first point is conic control. Yes, this happens. */
+ if ( FT_CURVE_TAG( outline->tags[last] ) == FT_CURVE_TAG_ON )
+ {
+ /* start at last point if it is on the curve */
+ v_start = v_last;
+ limit--;
+ }
+ else
+ {
+ /* if both first and last points are conic, */
+ /* start at their middle and record its position */
+ /* for closure */
+ v_start.x = ( v_start.x + v_last.x ) / 2;
+ v_start.y = ( v_start.y + v_last.y ) / 2;
+
+ v_last = v_start;
+ }
+ point--;
+ tags--;
+ }
+
+ error = func_interface->move_to( &v_start, user );
+ if ( error )
+ goto Exit;
+
+ while ( point < limit )
+ {
+ point++;
+ tags++;
+
+ tag = FT_CURVE_TAG( tags[0] );
+ switch ( tag )
+ {
+ case FT_CURVE_TAG_ON: /* emit a single line_to */
+ {
+ FT_Vector vec;
+
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ error = func_interface->line_to( &vec, user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ case FT_CURVE_TAG_CONIC: /* consume conic arcs */
+ {
+ v_control.x = SCALED( point->x );
+ v_control.y = SCALED( point->y );
+
+ Do_Conic:
+ if ( point < limit )
+ {
+ FT_Vector vec;
+ FT_Vector v_middle;
+
+
+ point++;
+ tags++;
+ tag = FT_CURVE_TAG( tags[0] );
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ if ( tag == FT_CURVE_TAG_ON )
+ {
+ error = func_interface->conic_to( &v_control, &vec,
+ user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ if ( tag != FT_CURVE_TAG_CONIC )
+ goto Invalid_Outline;
+
+ v_middle.x = ( v_control.x + vec.x ) / 2;
+ v_middle.y = ( v_control.y + vec.y ) / 2;
+
+ error = func_interface->conic_to( &v_control, &v_middle,
+ user );
+ if ( error )
+ goto Exit;
+
+ v_control = vec;
+ goto Do_Conic;
+ }
+
+ error = func_interface->conic_to( &v_control, &v_start,
+ user );
+ goto Close;
+ }
+
+ default: /* FT_CURVE_TAG_CUBIC */
+ {
+ FT_Vector vec1, vec2;
+
+
+ if ( point + 1 > limit ||
+ FT_CURVE_TAG( tags[1] ) != FT_CURVE_TAG_CUBIC )
+ goto Invalid_Outline;
+
+ point += 2;
+ tags += 2;
+
+ vec1.x = SCALED( point[-2].x );
+ vec1.y = SCALED( point[-2].y );
+
+ vec2.x = SCALED( point[-1].x );
+ vec2.y = SCALED( point[-1].y );
+
+ if ( point <= limit )
+ {
+ FT_Vector vec;
+
+
+ vec.x = SCALED( point->x );
+ vec.y = SCALED( point->y );
+
+ error = func_interface->cubic_to( &vec1, &vec2, &vec, user );
+ if ( error )
+ goto Exit;
+ continue;
+ }
+
+ error = func_interface->cubic_to( &vec1, &vec2, &v_start, user );
+ goto Close;
+ }
+ }
+ }
+
+ /* close the contour with a line segment */
+ error = func_interface->line_to( &v_start, user );
+
+ Close:
+ if ( error )
+ goto Exit;
+
+ first = last + 1;
+ }
+
+ return 0;
+
+ Exit:
+ return error;
+
+ Invalid_Outline:
+ return ErrRaster_Invalid_Outline;
+ }
+
+#endif /* _STANDALONE_ */
+
+
+ typedef struct TBand_
+ {
+ TPos min, max;
+
+ } TBand;
+
+
+ static int
+ gray_convert_glyph_inner( RAS_ARG )
+ {
+ static
+ const FT_Outline_Funcs func_interface =
+ {
+ (FT_Outline_MoveTo_Func) gray_move_to,
+ (FT_Outline_LineTo_Func) gray_line_to,
+ (FT_Outline_ConicTo_Func)gray_conic_to,
+ (FT_Outline_CubicTo_Func)gray_cubic_to,
+ 0,
+ 0
+ };
+
+ volatile int error = 0;
+
+ if ( ft_setjmp( ras.jump_buffer ) == 0 )
+ {
+ error = FT_Outline_Decompose( &ras.outline, &func_interface, &ras );
+ gray_record_cell( RAS_VAR );
+ }
+ else
+ {
+ error = ErrRaster_Memory_Overflow;
+ }
+
+ return error;
+ }
+
+
+ static int
+ gray_convert_glyph( RAS_ARG )
+ {
+ TBand bands[40];
+ TBand* volatile band;
+ int volatile n, num_bands;
+ TPos volatile min, max, max_y;
+ FT_BBox* clip;
+
+
+ /* Set up state in the raster object */
+ gray_compute_cbox( RAS_VAR );
+
+ /* clip to target bitmap, exit if nothing to do */
+ clip = &ras.clip_box;
+
+ if ( ras.max_ex <= clip->xMin || ras.min_ex >= clip->xMax ||
+ ras.max_ey <= clip->yMin || ras.min_ey >= clip->yMax )
+ return 0;
+
+ if ( ras.min_ex < clip->xMin ) ras.min_ex = clip->xMin;
+ if ( ras.min_ey < clip->yMin ) ras.min_ey = clip->yMin;
+
+ if ( ras.max_ex > clip->xMax ) ras.max_ex = clip->xMax;
+ if ( ras.max_ey > clip->yMax ) ras.max_ey = clip->yMax;
+
+ ras.count_ex = ras.max_ex - ras.min_ex;
+ ras.count_ey = ras.max_ey - ras.min_ey;
+
+ /* simple heuristic used to speed-up the bezier decomposition -- see */
+ /* the code in gray_render_conic() and gray_render_cubic() for more */
+ /* details */
+ ras.conic_level = 32;
+ ras.cubic_level = 16;
+
+ {
+ int level = 0;
+
+
+ if ( ras.count_ex > 24 || ras.count_ey > 24 )
+ level++;
+ if ( ras.count_ex > 120 || ras.count_ey > 120 )
+ level++;
+
+ ras.conic_level <<= level;
+ ras.cubic_level <<= level;
+ }
+
+ /* setup vertical bands */
+ num_bands = (int)( ( ras.max_ey - ras.min_ey ) / ras.band_size );
+ if ( num_bands == 0 ) num_bands = 1;
+ if ( num_bands >= 39 ) num_bands = 39;
+
+ ras.band_shoot = 0;
+
+ min = ras.min_ey;
+ max_y = ras.max_ey;
+
+ for ( n = 0; n < num_bands; n++, min = max )
+ {
+ max = min + ras.band_size;
+ if ( n == num_bands - 1 || max > max_y )
+ max = max_y;
+
+ bands[0].min = min;
+ bands[0].max = max;
+ band = bands;
+
+ while ( band >= bands )
+ {
+ TPos bottom, top, middle;
+ int error;
+
+ {
+ PCell cells_max;
+ int yindex;
+ long cell_start, cell_end, cell_mod;
+
+
+ ras.ycells = (PCell*)ras.buffer;
+ ras.ycount = band->max - band->min;
+
+ cell_start = sizeof ( PCell ) * ras.ycount;
+ cell_mod = cell_start % sizeof ( TCell );
+ if ( cell_mod > 0 )
+ cell_start += sizeof ( TCell ) - cell_mod;
+
+ cell_end = ras.buffer_size;
+ cell_end -= cell_end % sizeof( TCell );
+
+ cells_max = (PCell)( (char*)ras.buffer + cell_end );
+ ras.cells = (PCell)( (char*)ras.buffer + cell_start );
+ if ( ras.cells >= cells_max )
+ goto ReduceBands;
+
+ ras.max_cells = cells_max - ras.cells;
+ if ( ras.max_cells < 2 )
+ goto ReduceBands;
+
+ for ( yindex = 0; yindex < ras.ycount; yindex++ )
+ ras.ycells[yindex] = NULL;
+ }
+
+ ras.num_cells = 0;
+ ras.invalid = 1;
+ ras.min_ey = band->min;
+ ras.max_ey = band->max;
+ ras.count_ey = band->max - band->min;
+
+ error = gray_convert_glyph_inner( RAS_VAR );
+
+ if ( !error )
+ {
+ gray_sweep( RAS_VAR_ &ras.target );
+ band--;
+ continue;
+ }
+ else if ( error != ErrRaster_Memory_Overflow )
+ return 1;
+
+ ReduceBands:
+ /* render pool overflow; we will reduce the render band by half */
+ bottom = band->min;
+ top = band->max;
+ middle = bottom + ( ( top - bottom ) >> 1 );
+
+ /* This is too complex for a single scanline; there must */
+ /* be some problems. */
+ if ( middle == bottom )
+ {
+#ifdef DEBUG_GRAYS
+ fprintf( stderr, "Rotten glyph!\n" );
+#endif
+ return 1;
+ }
+
+ if ( bottom-top >= ras.band_size )
+ ras.band_shoot++;
+
+ band[1].min = bottom;
+ band[1].max = middle;
+ band[0].min = middle;
+ band[0].max = top;
+ band++;
+ }
+ }
+
+ if ( ras.band_shoot > 8 && ras.band_size > 16 )
+ ras.band_size = ras.band_size / 2;
+
+ return 0;
+ }
+
+
+ static int
+ gray_raster_render( PRaster raster,
+ const FT_Raster_Params* params )
+ {
+ const FT_Outline* outline = (const FT_Outline*)params->source;
+ const FT_Bitmap* target_map = params->target;
+ PWorker worker;
+
+
+ if ( !raster || !raster->buffer || !raster->buffer_size )
+ return ErrRaster_Invalid_Argument;
+
+ /* return immediately if the outline is empty */
+ if ( outline->n_points == 0 || outline->n_contours <= 0 )
+ return 0;
+
+ if ( !outline || !outline->contours || !outline->points )
+ return ErrRaster_Invalid_Outline;
+
+ if ( outline->n_points !=
+ outline->contours[outline->n_contours - 1] + 1 )
+ return ErrRaster_Invalid_Outline;
+
+ worker = raster->worker;
+
+ /* if direct mode is not set, we must have a target bitmap */
+ if ( ( params->flags & FT_RASTER_FLAG_DIRECT ) == 0 )
+ {
+ if ( !target_map )
+ return ErrRaster_Invalid_Argument;
+
+ /* nothing to do */
+ if ( !target_map->width || !target_map->rows )
+ return 0;
+
+ if ( !target_map->buffer )
+ return ErrRaster_Invalid_Argument;
+ }
+
+ /* this version does not support monochrome rendering */
+ if ( !( params->flags & FT_RASTER_FLAG_AA ) )
+ return ErrRaster_Invalid_Mode;
+
+ /* compute clipping box */
+ if ( ( params->flags & FT_RASTER_FLAG_DIRECT ) == 0 )
+ {
+ /* compute clip box from target pixmap */
+ ras.clip_box.xMin = 0;
+ ras.clip_box.yMin = 0;
+ ras.clip_box.xMax = target_map->width;
+ ras.clip_box.yMax = target_map->rows;
+ }
+ else if ( params->flags & FT_RASTER_FLAG_CLIP )
+ {
+ ras.clip_box = params->clip_box;
+ }
+ else
+ {
+ ras.clip_box.xMin = -32768L;
+ ras.clip_box.yMin = -32768L;
+ ras.clip_box.xMax = 32767L;
+ ras.clip_box.yMax = 32767L;
+ }
+
+ gray_init_cells( worker, raster->buffer, raster->buffer_size );
+
+ ras.outline = *outline;
+ ras.num_cells = 0;
+ ras.invalid = 1;
+ ras.band_size = raster->band_size;
+ ras.num_gray_spans = 0;
+
+ if ( target_map )
+ ras.target = *target_map;
+
+ ras.render_span = (FT_Raster_Span_Func)gray_render_span;
+ ras.render_span_data = &ras;
+
+ if ( params->flags & FT_RASTER_FLAG_DIRECT )
+ {
+ ras.render_span = (FT_Raster_Span_Func)params->gray_spans;
+ ras.render_span_data = params->user;
+ }
+
+ return gray_convert_glyph( worker );
+ }
+
+
+ /**** RASTER OBJECT CREATION: In standalone mode, we simply use *****/
+ /**** a static object. *****/
+
+#ifdef _STANDALONE_
+
+ static int
+ gray_raster_new( void* memory,
+ FT_Raster* araster )
+ {
+ static TRaster the_raster;
+
+ FT_UNUSED( memory );
+
+
+ *araster = (FT_Raster)&the_raster;
+ FT_MEM_ZERO( &the_raster, sizeof ( the_raster ) );
+
+ return 0;
+ }
+
+
+ static void
+ gray_raster_done( FT_Raster raster )
+ {
+ /* nothing */
+ FT_UNUSED( raster );
+ }
+
+#else /* _STANDALONE_ */
+
+ static int
+ gray_raster_new( FT_Memory memory,
+ FT_Raster* araster )
+ {
+ FT_Error error;
+ PRaster raster;
+
+
+ *araster = 0;
+ if ( !FT_ALLOC( raster, sizeof ( TRaster ) ) )
+ {
+ raster->memory = memory;
+ *araster = (FT_Raster)raster;
+ }
+
+ return error;
+ }
+
+
+ static void
+ gray_raster_done( FT_Raster raster )
+ {
+ FT_Memory memory = (FT_Memory)((PRaster)raster)->memory;
+
+
+ FT_FREE( raster );
+ }
+
+#endif /* _STANDALONE_ */
+
+
+ static void
+ gray_raster_reset( FT_Raster raster,
+ char* pool_base,
+ long pool_size )
+ {
+ PRaster rast = (PRaster)raster;
+
+
+ if ( raster )
+ {
+ if ( pool_base && pool_size >= (long)sizeof ( TWorker ) + 2048 )
+ {
+ PWorker worker = (PWorker)pool_base;
+
+
+ rast->worker = worker;
+ rast->buffer = pool_base +
+ ( ( sizeof ( TWorker ) + sizeof ( TCell ) - 1 ) &
+ ~( sizeof ( TCell ) - 1 ) );
+ rast->buffer_size = (long)( ( pool_base + pool_size ) -
+ (char*)rast->buffer ) &
+ ~( sizeof ( TCell ) - 1 );
+ rast->band_size = (int)( rast->buffer_size /
+ ( sizeof ( TCell ) * 8 ) );
+ }
+ else
+ {
+ rast->buffer = NULL;
+ rast->buffer_size = 0;
+ rast->worker = NULL;
+ }
+ }
+ }
+
+
+ const FT_Raster_Funcs ft_grays_raster =
+ {
+ FT_GLYPH_FORMAT_OUTLINE,
+
+ (FT_Raster_New_Func) gray_raster_new,
+ (FT_Raster_Reset_Func) gray_raster_reset,
+ (FT_Raster_Set_Mode_Func)0,
+ (FT_Raster_Render_Func) gray_raster_render,
+ (FT_Raster_Done_Func) gray_raster_done
+ };
+
+
+/* END */
projects / reactos.git / blobdiff