smooth.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

    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_MemoryOverflow;
    }

    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;

    /* 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.max_ex > 24 || ras.max_ey > 24 )
        level++;
      if ( ras.max_ex > 120 || ras.max_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;


        ras.num_cells = 0;
        ras.invalid   = 1;
        ras.min_ey    = band->min;
        ras.max_ey    = band->max;

#if 1
        error = gray_convert_glyph_inner( RAS_VAR );
#else
        error = FT_Outline_Decompose( outline, &func_interface, &ras ) ||
                gray_record_cell( RAS_VAR );
#endif

        if ( !error )
        {
#ifdef SHELL_SORT
          gray_shell_sort( ras.cells, ras.num_cells );
#else
          gray_quick_sort( ras.cells, ras.num_cells );
#endif

#ifdef DEBUG_GRAYS
          gray_check_sort( ras.cells, ras.num_cells );
          gray_dump_cells( RAS_VAR );
#endif

          gray_sweep( RAS_VAR_  &ras.target );
          band--;
          continue;
        }
        else if ( error != ErrRaster_MemoryOverflow )
          return 1;

        /* render pool overflow, we will reduce the render band by half */
        bottom = band->min;
        top    = band->max;
        middle = bottom + ( ( top - bottom ) >> 1 );

        /* waoow! This is too complex for a single scanline, something */
        /* must be really rotten here!                                 */
        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;


    if ( !raster || !raster->cells || !raster->max_cells )
      return -1;

    /* 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;

    /* if direct mode is not set, we must have a target bitmap */
    if ( ( params->flags & FT_RASTER_FLAG_DIRECT ) == 0 &&
         ( !target_map || !target_map->buffer )         )
      return -1;

    /* 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;
    }

    ras.outline   = *outline;
    ras.num_cells = 0;
    ras.invalid   = 1;

    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( (PRaster)raster );
  }


  /**** RASTER OBJECT CREATION: In standalone mode, we simply use *****/
  /****                         a static object.                  *****/

#ifdef GRAYS_USE_GAMMA

  /* initialize the "gamma" table. Yes, this is really a crummy function */
  /* but the results look pretty good for something that simple.         */
  /*                                                                     */
#define M_MAX  255
#define M_X    128
#define M_Y    192

  static void
  grays_init_gamma( PRaster  raster )
  {
    unsigned int  x, a;


    for ( x = 0; x < 256; x++ )
    {
      if ( x <= M_X )
        a = ( x * M_Y + M_X / 2) / M_X;
      else
        a = M_Y + ( ( x - M_X ) * ( M_MAX - M_Y ) +
            ( M_MAX - M_X ) / 2 ) / ( M_MAX - M_X );

      raster->gamma[x] = (unsigned char)a;
    }
  }

#endif /* GRAYS_USE_GAMMA */

#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 ) );

#ifdef GRAYS_USE_GAMMA
    grays_init_gamma( (PRaster)*araster );
#endif

    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;

#ifdef GRAYS_USE_GAMMA
      grays_init_gamma( raster );
#endif
    }

    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 && pool_base && pool_size >= 4096 )
      gray_init_cells( rast, (char*)pool_base, pool_size );

    rast->band_size  = (int)( ( pool_size / sizeof ( TCell ) ) / 8 );
  }


  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 */

/***************************************************************************/
/*                                                                         */
/*  ftsmooth.c                                                             */
/*                                                                         */
/*    Anti-aliasing renderer interface (body).                             */
/*                                                                         */
/*  Copyright 2000-2001, 2002, 2003, 2004, 2005 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.                                        */
/*                                                                         */
/***************************************************************************/


#include "ft2build.h"
#include FT_INTERNAL_OBJECTS_H
#include FT_OUTLINE_H
#include "ftsmooth.h"
#include "ftgrays.h"

#include "ftsmerrs.h"


  /* initialize renderer -- init its raster */
  static FT_Error
  ft_smooth_init( FT_Renderer  render )
  {
    FT_Library  library = FT_MODULE_LIBRARY( render );


    render->clazz->raster_class->raster_reset( render->raster,
                                               library->raster_pool,
                                               library->raster_pool_size );

    return 0;
  }


  /* sets render-specific mode */
  static FT_Error
  ft_smooth_set_mode( FT_Renderer  render,
                      FT_ULong     mode_tag,
                      FT_Pointer   data )
  {
    /* we simply pass it to the raster */
    return render->clazz->raster_class->raster_set_mode( render->raster,
                                                         mode_tag,
                                                         data );
  }

  /* transform a given glyph image */
  static FT_Error
  ft_smooth_transform( FT_Renderer       render,
                       FT_GlyphSlot      slot,
                       const FT_Matrix*  matrix,
                       const FT_Vector*  delta )
  {
    FT_Error  error = Smooth_Err_Ok;


    if ( slot->format != render->glyph_format )
    {
      error = Smooth_Err_Invalid_Argument;
      goto Exit;
    }

    if ( matrix )
      FT_Outline_Transform( &slot->outline, matrix );

    if ( delta )
      FT_Outline_Translate( &slot->outline, delta->x, delta->y );

  Exit:
    return error;
  }


  /* return the glyph's control box */
  static void
  ft_smooth_get_cbox( FT_Renderer   render,
                      FT_GlyphSlot  slot,
                      FT_BBox*      cbox )
  {
    FT_MEM_ZERO( cbox, sizeof ( *cbox ) );

    if ( slot->format == render->glyph_format )
      FT_Outline_Get_CBox( &slot->outline, cbox );