afloader.c

奇趣公司比较新的qt/emd版本

/***************************************************************************/
/*                                                                         */
/*  afloader.c                                                             */
/*                                                                         */
/*    Auto-fitter glyph loading routines (body).                           */
/*                                                                         */
/*  Copyright 2003, 2004, 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.                                        */
/*                                                                         */
/***************************************************************************/


#include "afloader.h"
#include "afhints.h"
#include "afglobal.h"
#include "aflatin.h"
#include "aferrors.h"


  FT_LOCAL_DEF( FT_Error )
  af_loader_init( AF_Loader  loader,
                  FT_Memory  memory )
  {
    FT_ZERO( loader );

    af_glyph_hints_init( &loader->hints, memory );
#ifdef AF_DEBUG
    _af_debug_hints = &loader->hints;
#endif
    return FT_GlyphLoader_New( memory, &loader->gloader );
  }


  FT_LOCAL_DEF( FT_Error )
  af_loader_reset( AF_Loader  loader,
                   FT_Face    face )
  {
    FT_Error  error = AF_Err_Ok;


    loader->face    = face;
    loader->globals = (AF_FaceGlobals)face->autohint.data;

    FT_GlyphLoader_Rewind( loader->gloader );

    if ( loader->globals == NULL )
    {
      error = af_face_globals_new( face, &loader->globals );
      if ( !error )
      {
        face->autohint.data =
          (FT_Pointer)loader->globals;
        face->autohint.finalizer =
          (FT_Generic_Finalizer)af_face_globals_free;
      }
    }

    return error;
  }


  FT_LOCAL_DEF( void )
  af_loader_done( AF_Loader  loader )
  {
    af_glyph_hints_done( &loader->hints );

    loader->face    = NULL;
    loader->globals = NULL;

#ifdef AF_DEBUG
    _af_debug_hints = NULL;
#endif
    FT_GlyphLoader_Done( loader->gloader );
    loader->gloader = NULL;
  }


  static FT_Error
  af_loader_load_g( AF_Loader  loader,
                    AF_Scaler  scaler,
                    FT_UInt    glyph_index,
                    FT_Int32   load_flags,
                    FT_UInt    depth )
  {
    FT_Error          error;
    FT_Face           face     = loader->face;
    FT_GlyphLoader    gloader  = loader->gloader;
    AF_ScriptMetrics  metrics  = loader->metrics;
    AF_GlyphHints     hints    = &loader->hints;
    FT_GlyphSlot      slot     = face->glyph;
    FT_Slot_Internal  internal = slot->internal;


    error = FT_Load_Glyph( face, glyph_index, load_flags );
    if ( error )
      goto Exit;

    loader->transformed = internal->glyph_transformed;
    if ( loader->transformed )
    {
      FT_Matrix  inverse;


      loader->trans_matrix = internal->glyph_matrix;
      loader->trans_delta  = internal->glyph_delta;

      inverse = loader->trans_matrix;
      FT_Matrix_Invert( &inverse );
      FT_Vector_Transform( &loader->trans_delta, &inverse );
    }

    /* set linear metrics */
    slot->linearHoriAdvance = slot->metrics.horiAdvance;
    slot->linearVertAdvance = slot->metrics.vertAdvance;

    switch ( slot->format )
    {
    case FT_GLYPH_FORMAT_OUTLINE:
      /* translate the loaded glyph when an internal transform is needed */
      if ( loader->transformed )
        FT_Outline_Translate( &slot->outline,
                              loader->trans_delta.x,
                              loader->trans_delta.y );

      /* copy the outline points in the loader's current               */
      /* extra points which is used to keep original glyph coordinates */
      error = FT_GLYPHLOADER_CHECK_POINTS( gloader,
                                           slot->outline.n_points + 4,
                                           slot->outline.n_contours );
      if ( error )
        goto Exit;

      FT_ARRAY_COPY( gloader->current.outline.points,
                     slot->outline.points,
                     slot->outline.n_points );

      FT_ARRAY_COPY( gloader->current.outline.contours,
                     slot->outline.contours,
                     slot->outline.n_contours );

      FT_ARRAY_COPY( gloader->current.outline.tags,
                     slot->outline.tags,
                     slot->outline.n_points );

      gloader->current.outline.n_points   = slot->outline.n_points;
      gloader->current.outline.n_contours = slot->outline.n_contours;

      /* compute original horizontal phantom points (and ignore */
      /* vertical ones)                                         */
      loader->pp1.x = hints->x_delta;
      loader->pp1.y = hints->y_delta;
      loader->pp2.x = FT_MulFix( slot->metrics.horiAdvance,
                                 hints->x_scale ) + hints->x_delta;
      loader->pp2.y = hints->y_delta;

      /* be sure to check for spacing glyphs */
      if ( slot->outline.n_points == 0 )
        goto Hint_Metrics;

      /* now load the slot image into the auto-outline and run the */
      /* automatic hinting process                                 */
      metrics->clazz->script_hints_apply( hints,
                                          &gloader->current.outline,
                                          metrics );

      /* we now need to hint the metrics according to the change in */
      /* width/positioning that occurred during the hinting process */
      if ( scaler->render_mode != FT_RENDER_MODE_LIGHT )
      {
        FT_Pos        old_advance, old_rsb, old_lsb, new_lsb;
        FT_Pos        pp1x_uh, pp2x_uh;
        AF_AxisHints  axis  = &hints->axis[AF_DIMENSION_HORZ];
        AF_Edge       edge1 = axis->edges;         /* leftmost edge  */
        AF_Edge       edge2 = edge1 +
                              axis->num_edges - 1; /* rightmost edge */


        if ( axis->num_edges > 1 && AF_HINTS_DO_ADVANCE( hints ) )
        {
          old_advance = loader->pp2.x - loader->pp1.x;
          old_rsb     = loader->pp2.x - edge2->opos;
          old_lsb     = edge1->opos;
          new_lsb     = edge1->pos;

          /* remember unhinted values to later account */
          /* for rounding errors                       */

          pp1x_uh = new_lsb    - old_lsb;
          pp2x_uh = edge2->pos + old_rsb;

          /* prefer too much space over too little space */
          /* for very small sizes                        */

          if ( old_lsb < 24 )
            pp1x_uh -= 8;

          if ( old_rsb < 24 )
            pp2x_uh += 8;

          loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
          loader->pp2.x = FT_PIX_ROUND( pp2x_uh );

          if ( loader->pp1.x >= new_lsb && old_lsb > 0 )
            loader->pp1.x -= 64;

          if ( loader->pp2.x <= edge2->pos && old_rsb > 0 )
            loader->pp2.x += 64;

          slot->lsb_delta = loader->pp1.x - pp1x_uh;
          slot->rsb_delta = loader->pp2.x - pp2x_uh;
        }
        else
        {
          FT_Pos   pp1x = loader->pp1.x;
          FT_Pos   pp2x = loader->pp2.x;

          loader->pp1.x = FT_PIX_ROUND( pp1x );
          loader->pp2.x = FT_PIX_ROUND( pp2x );

          slot->lsb_delta = loader->pp1.x - pp1x;
          slot->rsb_delta = loader->pp2.x - pp2x;
        }
      }
      else
      {
        FT_Pos   pp1x = loader->pp1.x;
        FT_Pos   pp2x = loader->pp2.x;

        loader->pp1.x = FT_PIX_ROUND( pp1x + hints->xmin_delta );
        loader->pp2.x = FT_PIX_ROUND( pp2x + hints->xmax_delta );

        slot->lsb_delta = loader->pp1.x - pp1x;
        slot->rsb_delta = loader->pp2.x - pp2x;
      }

      /* good, we simply add the glyph to our loader's base */
      FT_GlyphLoader_Add( gloader );
      break;

    case FT_GLYPH_FORMAT_COMPOSITE:
      {
        FT_UInt      nn, num_subglyphs = slot->num_subglyphs;
        FT_UInt      num_base_subgs, start_point;
        FT_SubGlyph  subglyph;


        start_point = gloader->base.outline.n_points;

        /* first of all, copy the subglyph descriptors in the glyph loader */
        error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
        if ( error )
          goto Exit;

        FT_ARRAY_COPY( gloader->current.subglyphs,
                       slot->subglyphs,
                       num_subglyphs );