ftobjs.c

qt-embedded-2.3.8.tar.gz源码

    if ( new_max > loader->max_contours )
    {
      new_max = ( new_max + 3 ) & -4;
      if ( REALLOC_ARRAY( base->contours, base->n_contours,
                          new_max, FT_Short ) )
        goto Exit;

      adjust = 1;
      loader->max_contours = new_max;
    }

    if ( adjust )
      FT_GlyphLoader_Adjust_Points( loader );

  Exit:
    return error;
  }


  /* Ensure that we can add `n_subglyphs' to our glyph. this function */
  /* reallocates its subglyphs table if necessary.  Note that it DOES */
  /* NOT change the number of subglyphs within the loader!            */
  /*                                                                  */
  FT_BASE_DEF( FT_Error )  FT_GlyphLoader_Check_Subglyphs(
                             FT_GlyphLoader*  loader,
                             FT_UInt          n_subs )
  {
    FT_Memory  memory = loader->memory;
    FT_Error   error  = FT_Err_Ok;
    FT_UInt    new_max;

    FT_GlyphLoad*  base    = &loader->base;
    FT_GlyphLoad*  current = &loader->current;


    new_max = base->num_subglyphs + current->num_subglyphs + n_subs;
    if ( new_max > loader->max_subglyphs )
    {
      new_max = ( new_max + 1 ) & -2;
      if ( REALLOC_ARRAY( base->subglyphs, base->num_subglyphs,
                          new_max, FT_SubGlyph ) )
        goto Exit;

      loader->max_subglyphs = new_max;

      FT_GlyphLoader_Adjust_Subglyphs( loader );
    }

  Exit:
    return error;
  }


  /* prepare loader for the addition of a new glyph on top of the base one */
  FT_BASE_DEF( void )  FT_GlyphLoader_Prepare( FT_GlyphLoader*  loader )
  {
    FT_GlyphLoad*  current = &loader->current;


    current->outline.n_points   = 0;
    current->outline.n_contours = 0;
    current->num_subglyphs      = 0;

    FT_GlyphLoader_Adjust_Points   ( loader );
    FT_GlyphLoader_Adjust_Subglyphs( loader );
  }


  /* add current glyph to the base image - and prepare for another */
  FT_BASE_DEF( void )  FT_GlyphLoader_Add( FT_GlyphLoader*  loader )
  {
    FT_GlyphLoad*  base    = &loader->base;
    FT_GlyphLoad*  current = &loader->current;

    FT_UInt        n_curr_contours = current->outline.n_contours;
    FT_UInt        n_base_points   = base->outline.n_points;
    FT_UInt        n;


    base->outline.n_points   += current->outline.n_points;
    base->outline.n_contours += current->outline.n_contours;
    base->num_subglyphs      += current->num_subglyphs;

    /* adjust contours count in newest outline */
    for ( n = 0; n < n_curr_contours; n++ )
      current->outline.contours[n] += n_base_points;

    /* prepare for another new glyph image */
    FT_GlyphLoader_Prepare( loader );
  }


  FT_BASE_DEF( FT_Error )  FT_GlyphLoader_Copy_Points(
                             FT_GlyphLoader*  target,
                             FT_GlyphLoader*  source )
  {
    FT_Error  error;
    FT_UInt   num_points   = source->base.outline.n_points;
    FT_UInt   num_contours = source->base.outline.n_contours;


    error = FT_GlyphLoader_Check_Points( target, num_points, num_contours );
    if ( !error )
    {
      FT_Outline*  out = &target->base.outline;
      FT_Outline*  in  = &source->base.outline;


      MEM_Copy( out->points, in->points,
                num_points * sizeof ( FT_Vector ) );
      MEM_Copy( out->tags, in->tags,
                num_points * sizeof ( char ) );
      MEM_Copy( out->contours, in->contours,
                num_contours * sizeof ( short ) );

      /* do we need to copy the extra points? */
      if ( target->use_extra && source->use_extra )
        MEM_Copy( target->base.extra_points, source->base.extra_points,
                  num_points * sizeof ( FT_Vector ) );

      out->n_points   = num_points;
      out->n_contours = num_contours;

      FT_GlyphLoader_Adjust_Points( target );
    }

    return error;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****               FACE, SIZE & GLYPH SLOT OBJECTS                   ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  static
  FT_Error  ft_glyphslot_init( FT_GlyphSlot  slot )
  {
    FT_Driver         driver = slot->face->driver;
    FT_Driver_Class*  clazz  = driver->clazz;
    FT_Memory         memory = driver->root.memory;
    FT_Error          error  = FT_Err_Ok;
    FT_Slot_Internal  internal;


    slot->library = driver->root.library;

    if ( ALLOC( internal, sizeof ( *internal ) ) )
      goto Exit;

    slot->internal = internal;

    if ( FT_DRIVER_USES_OUTLINES( driver ) )
      error = FT_GlyphLoader_New( memory, &internal->loader );

    if ( !error && clazz->init_slot )
      error = clazz->init_slot( slot );

  Exit:
    return error;
  }


  static
  void  ft_glyphslot_clear( FT_GlyphSlot  slot )
  {
    /* free bitmap if needed */
    if ( slot->flags & ft_glyph_own_bitmap )
    {
      FT_Memory  memory = FT_FACE_MEMORY( slot->face );


      FREE( slot->bitmap.buffer );
      slot->flags &= ~ft_glyph_own_bitmap;
    }

    /* clear all public fields in the glyph slot */
    MEM_Set( &slot->metrics, 0, sizeof ( slot->metrics ) );
    MEM_Set( &slot->outline, 0, sizeof ( slot->outline ) );
    MEM_Set( &slot->bitmap,  0, sizeof ( slot->bitmap )  );

    slot->bitmap_left   = 0;
    slot->bitmap_top    = 0;
    slot->num_subglyphs = 0;
    slot->subglyphs     = 0;
    slot->control_data  = 0;
    slot->control_len   = 0;
    slot->other         = 0;
    slot->format        = ft_glyph_format_none;

    slot->linearHoriAdvance = 0;
    slot->linearVertAdvance = 0;
  }


  static
  void  ft_glyphslot_done( FT_GlyphSlot  slot )
  {
    FT_Driver         driver = slot->face->driver;
    FT_Driver_Class*  clazz  = driver->clazz;
    FT_Memory         memory = driver->root.memory;


    if ( clazz->done_slot )
      clazz->done_slot( slot );

    /* free bitmap buffer if needed */
    if ( slot->flags & ft_glyph_own_bitmap )
      FREE( slot->bitmap.buffer );

    /* free glyph loader */
    if ( FT_DRIVER_USES_OUTLINES( driver ) )
    {
      FT_GlyphLoader_Done( slot->internal->loader );
      slot->internal->loader = 0;
    }

    FREE( slot->internal );
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Error )  FT_New_GlyphSlot( FT_Face        face,
                                             FT_GlyphSlot  *aslot )
  {
    FT_Error          error;
    FT_Driver         driver;
    FT_Driver_Class*  clazz;
    FT_Memory         memory;
    FT_GlyphSlot      slot;


    if ( !face || !aslot || !face->driver )
      return FT_Err_Invalid_Argument;

    *aslot = 0;

    driver = face->driver;
    clazz  = driver->clazz;
    memory = driver->root.memory;

    FT_TRACE4(( "FT_New_GlyphSlot: Creating new slot object\n" ));
    if ( !ALLOC( slot, clazz->slot_object_size ) )
    {
      slot->face = face;

      error = ft_glyphslot_init( slot );
      if ( error )
      {
        ft_glyphslot_done( slot );
        FREE( slot );
        goto Exit;
      }

      *aslot = slot;
    }

  Exit:
    FT_TRACE4(( "FT_New_GlyphSlot: Return %d\n", error ));
    return error;
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( void )  FT_Done_GlyphSlot( FT_GlyphSlot  slot )
  {
    if ( slot )
    {
      FT_Driver         driver = slot->face->driver;
      FT_Memory         memory = driver->root.memory;
      FT_GlyphSlot*     parent;
      FT_GlyphSlot      cur;


      /* Remove slot from its parent face's list */
      parent = &slot->face->glyph;
      cur    = *parent;

      while ( cur )
      {
        if ( cur == slot )
        {
          *parent = cur->next;
          ft_glyphslot_done( slot );
          FREE( slot );
          break;
        }
        cur = cur->next;
      }
    }
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( void )  FT_Set_Transform( FT_Face     face,
                                           FT_Matrix*  matrix,
                                           FT_Vector*  delta )
  {
    FT_Face_Internal  internal;
    

    if ( !face )
      return;

    internal = face->internal;

    internal->transform_flags = 0;

    if ( !matrix )
    {
      internal->transform_matrix.xx = 0x10000L;
      internal->transform_matrix.xy = 0;
      internal->transform_matrix.yx = 0;
      internal->transform_matrix.yy = 0x10000L;
      matrix = &internal->transform_matrix;
    }
    else
      internal->transform_matrix = *matrix;

    /* set transform_flags bit flag 0 if `matrix' isn't the identity */
    if ( ( matrix->xy | matrix->yx ) ||
         matrix->xx != 0x10000L      ||
         matrix->yy != 0x10000L      )
      internal->transform_flags |= 1;

    if ( !delta )
    {
      internal->transform_delta.x = 0;
      internal->transform_delta.y = 0;
      delta = &internal->transform_delta;
    }
    else
      internal->transform_delta = *delta;

    /* set transform_flags bit flag 1 if `delta' isn't the null vector */
    if ( delta->x | delta->y )
      internal->transform_flags |= 2;
  }


  static FT_Renderer  ft_lookup_glyph_renderer( FT_GlyphSlot  slot );


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )  FT_Load_Glyph( FT_Face  face,
                                            FT_UInt  glyph_index,
                                            FT_Int   load_flags )
  {
    FT_Error      error;
    FT_Driver     driver;
    FT_GlyphSlot  slot;
    FT_Library    library;
    FT_Bool       autohint;
    FT_Module     hinter;


    if ( !face || !face->size || !face->glyph )
      return FT_Err_Invalid_Face_Handle;

    if ( glyph_index >= (FT_UInt)face->num_glyphs )
      return FT_Err_Invalid_Argument;

    slot = face->glyph;
    ft_glyphslot_clear( slot );

    driver = face->driver;

    /* when the flag NO_RECURSE is set, we disable hinting and scaling */
    if ( load_flags & FT_LOAD_NO_RECURSE )
    {
      /* disable scaling, hinting, and transformation */
      load_flags |= FT_LOAD_NO_SCALE         |
                    FT_LOAD_NO_HINTING       |
                    FT_LOAD_IGNORE_TRANSFORM;

      /* disable bitmap rendering */
      load_flags &= ~FT_LOAD_RENDER;
    }

    /* do we need to load the glyph through the auto-hinter? */
    library  = driver->root.library;
    hinter   = library->auto_hinter;
    autohint = hinter                                                      &&
               !( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) &&
               FT_DRIVER_IS_SCALABLE(driver) &&
               FT_DRIVER_USES_OUTLINES(driver);
    if ( autohint )
    {
      if ( FT_DRIVER_HAS_HINTER( driver ) &&
           !( load_flags & FT_LOAD_FORCE_AUTOHINT ) )
        autohint = 0;
    }

    if ( autohint )
    {
      FT_AutoHinter_Interface*  hinting;


      hinting = (FT_AutoHinter_Interface*)hinter->clazz->module_interface;

      error   = hinting->load_glyph( (FT_AutoHinter)hinter,
                                     slot, face->size,
                                     glyph_index, load_flags );
    }
    else
      error = driver->clazz->load_glyph( slot,
                                         face->size,
                                         glyph_index,
                                         load_flags );
    if ( error )
      goto Exit;

    /* compute the advance */
    if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
    {
      slot->advance.x = 0;
      slot->advance.y = slot->metrics.vertAdvance;
    }
    else
    {
      slot->advance.x = slot->metrics.horiAdvance;
      slot->advance.y = 0;
    }

    /* compute the linear advance in 16.16 pixels */
    if ( ( load_flags & FT_LOAD_LINEAR_DESIGN ) == 0 )
    {
      FT_UInt           EM      = face->units_per_EM;
      FT_Size_Metrics*  metrics = &face->size->metrics;

      slot->linearHoriAdvance = FT_MulDiv( slot->linearHoriAdvance,
                                           (FT_Long)metrics->x_ppem << 16, EM );

      slot->linearVertAdvance = FT_MulDiv( slot->linearVertAdvance,
                                           (FT_Long)metrics->y_ppem << 16, EM );
    }

    if ( ( load_flags & FT_LOAD_IGNORE_TRANSFORM ) == 0 )
    {