C++ FT_Outline_Translate函数代码示例

FT_Bitmap* R_RenderGlyph(FT_GlyphSlot glyph, glyphInfo_t* glyphOut) {
    FT_Bitmap* bit2;
    int left, right, width, top, bottom, height, pitch, size;

    R_GetGlyphInfo(glyph, &left, &right, &width, &top, &bottom, &height, &pitch);

    if (glyph->format == ft_glyph_format_outline) {
        size = pitch * height;

        bit2 = (FT_Bitmap*) ri.Z_Malloc(sizeof(FT_Bitmap));

        bit2->width = width;
        bit2->rows = height;
        bit2->pitch = pitch;
        bit2->pixel_mode = ft_pixel_mode_grays;
        bit2->buffer = (unsigned char*) ri.Z_Malloc(pitch * height);
        bit2->num_grays = 256;

        Com_Memset(bit2->buffer, 0, size);

        FT_Outline_Translate(&glyph->outline, -left, -bottom);

        FT_Outline_Get_Bitmap(ftLibrary, &glyph->outline, bit2);

        glyphOut->height = height;
        glyphOut->pitch = pitch;
        glyphOut->top = (glyph->metrics.horiBearingY >> 6) + 1;
        glyphOut->bottom = bottom;

        return bit2;
    } else {

/* transform a given glyph image */
static
FT_Error  ft_raster1_transform(FT_Renderer render,
                               FT_GlyphSlot slot,
                               FT_Matrix    *matrix,
                               FT_Vector    *delta)
{
	FT_Error error = FT_Err_Ok;


	if(slot->format != render->glyph_format)
	{
		error = FT_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;
}

/* convert a slot's glyph image into a bitmap */
static FT_Error
ft_smooth_render_generic( FT_Renderer       render,
                          FT_GlyphSlot      slot,
                          FT_Render_Mode    mode,
                          const FT_Vector*  origin,
                          FT_Render_Mode    required_mode )
{
    FT_Error     error;
    FT_Outline*  outline = NULL;
    FT_BBox      cbox;
    FT_UInt      width, height, pitch;
#ifndef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
    FT_UInt      height_org, width_org;
#endif
    FT_Bitmap*   bitmap;
    FT_Memory    memory;
    FT_Int       hmul = mode == FT_RENDER_MODE_LCD;
    FT_Int       vmul = mode == FT_RENDER_MODE_LCD_V;
    FT_Pos       x_shift, y_shift, x_left, y_top;

    FT_Raster_Params  params;


    /* check glyph image format */
    if ( slot->format != render->glyph_format )
    {
        error = Smooth_Err_Invalid_Argument;
        goto Exit;
    }

    /* check mode */
    if ( mode != required_mode )
        return Smooth_Err_Cannot_Render_Glyph;

    outline = &slot->outline;

    /* translate the outline to the new origin if needed */
    if ( origin )
        FT_Outline_Translate( outline, origin->x, origin->y );

    /* compute the control box, and grid fit it */
    FT_Outline_Get_CBox( outline, &cbox );

    cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
    cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
    cbox.xMax = FT_PIX_CEIL( cbox.xMax );
    cbox.yMax = FT_PIX_CEIL( cbox.yMax );

    if ( cbox.xMin < 0 && cbox.xMax > FT_INT_MAX + cbox.xMin )
    {
        FT_ERROR(( "ft_smooth_render_generic: glyph too large:"
                   " xMin = %d, xMax = %d\n",
                   cbox.xMin >> 6, cbox.xMax >> 6 ));
        return Smooth_Err_Raster_Overflow;
    }

  static
  void  ft_outline_glyph_transform( FT_OutlineGlyph  glyph,
                                    FT_Matrix*       matrix,
                                    FT_Vector*       delta )
  {
    if ( matrix )
      FT_Outline_Transform( &glyph->outline, matrix );

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

  ft_outline_glyph_transform( FT_Glyph          outline_glyph,
                              const FT_Matrix*  matrix,
                              const FT_Vector*  delta )
  {
    FT_OutlineGlyph  glyph = (FT_OutlineGlyph)outline_glyph;


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

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

Bitmap *outline_to_bitmap(ASS_Library *library, FT_Library ftlib,
                          FT_Outline *outline, int bord)
{
    Bitmap *bm;
    int w, h;
    int error;
    FT_BBox bbox;
    FT_Bitmap bitmap;

    FT_Outline_Get_CBox(outline, &bbox);
    // move glyph to origin (0, 0)
    bbox.xMin &= ~63;
    bbox.yMin &= ~63;
    FT_Outline_Translate(outline, -bbox.xMin, -bbox.yMin);
    // bitmap size
    bbox.xMax = (bbox.xMax + 63) & ~63;
    bbox.yMax = (bbox.yMax + 63) & ~63;
    w = (bbox.xMax - bbox.xMin) >> 6;
    h = (bbox.yMax - bbox.yMin) >> 6;
    // pen offset
    bbox.xMin >>= 6;
    bbox.yMax >>= 6;

    if (w * h > 8000000) {
        ass_msg(library, MSGL_WARN, "Glyph bounding box too large: %dx%dpx",
                w, h);
        return NULL;
    }

    // allocate and set up bitmap
    bm = alloc_bitmap(w + 2 * bord, h + 2 * bord);
    bm->left = bbox.xMin - bord;
    bm->top = -bbox.yMax - bord;
    bitmap.width = w;
    bitmap.rows = h;
    bitmap.pitch = bm->stride;
    bitmap.buffer = bm->buffer + bord + bm->stride * bord;
    bitmap.num_grays = 256;
    bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;

    // render into target bitmap
    if ((error = FT_Outline_Get_Bitmap(ftlib, outline, &bitmap))) {
        ass_msg(library, MSGL_WARN, "Failed to rasterize glyph: %d\n", error);
        ass_free_bitmap(bm);
        return NULL;
    }

    return bm;
}

void SkScalerContext_CairoFT::fixVerticalLayoutBearing(FT_GlyphSlot glyph)
{
    FT_Vector vector;
    vector.x = glyph->metrics.vertBearingX - glyph->metrics.horiBearingX;
    vector.y = -glyph->metrics.vertBearingY - glyph->metrics.horiBearingY;
    if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
        if (fHaveShape) {
            FT_Vector_Transform(&vector, &fShapeMatrix);
        }
        FT_Outline_Translate(&glyph->outline, vector.x, vector.y);
    } else if (glyph->format == FT_GLYPH_FORMAT_BITMAP) {
        glyph->bitmap_left += SkFDot6Floor(vector.x);
        glyph->bitmap_top  += SkFDot6Floor(vector.y);
    }
}

static FT_Outline* getFTOutline(JNIEnv* env, jobject font2D,
        FTScalerContext *context, FTScalerInfo* scalerInfo,
        jint glyphCode, jfloat xpos, jfloat ypos) {
    int renderFlags;
    int glyph_index;
    FT_Error error;
    FT_GlyphSlot ftglyph;

    if (glyphCode >= INVISIBLE_GLYPHS ||
            isNullScalerContext(context) || scalerInfo == NULL) {
        return NULL;
    }

    error = setupFTContext(env, font2D, scalerInfo, context);
    if (error) {
        return NULL;
    }

    renderFlags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;

    glyph_index = FT_Get_Char_Index(scalerInfo->face, glyphCode);

    error = FT_Load_Glyph(scalerInfo->face, glyphCode, renderFlags);
    if (error) {
        return NULL;
    }

    ftglyph = scalerInfo->face->glyph;

    /* apply styles */
    if (context->doBold) { /* if bold style */
        FT_GlyphSlot_Embolden(ftglyph);
    }
    if (context->doItalize) { /* if oblique */
        FT_GlyphSlot_Oblique(ftglyph);
    }

    FT_Outline_Translate(&ftglyph->outline,
                         FloatToF26Dot6(xpos),
                         -FloatToF26Dot6(ypos));

    return &ftglyph->outline;
}

static FT_Error
LoadTrueTypeChar(Font *fnt,
                 int idx,
                 Boolean hint,
                 Boolean quiet)
{
  FT_Error error;
  int flags;


  flags = FT_LOAD_DEFAULT;
  if (hint)
    flags |= FT_LOAD_FORCE_AUTOHINT;

  error = FT_Load_Glyph(face, idx, flags);
  if (!error)
  {
    if (fnt->efactor != 1.0 || fnt->slant != 0.0 )
      FT_Outline_Transform(&face->glyph->outline, &matrix1);
    if (fnt->rotate)
    {
      FT_Outline_Transform(&face->glyph->outline, &matrix2);
      error = FT_Outline_Get_BBox(&face->glyph->outline, &bbox); /* we need the non-
                                                                    grid-fitted bbox */
      if (!error)
        FT_Outline_Translate(&face->glyph->outline,
                             face->glyph->metrics.vertBearingY - bbox.xMin,
                             -fnt->y_offset * ppem * 64);
    }
  }
  if (!error)
    error = FT_Outline_Get_BBox(&face->glyph->outline, &bbox);
  if (!error)
  {
    FT_Outline_Get_CBox(&face->glyph->outline, &bbox); /* for the case of BBox != CBox */
    SetRasterArea(quiet);
  }
  return error;
}

/**
 * @brief R_RenderGlyph
 * @param[in] glyph
 * @param[out] glyphOut
 * @return
 */
FT_Bitmap *R_RenderGlyph(FT_GlyphSlot glyph, glyphInfo_t *glyphOut)
{
	FT_Bitmap *bit2;
	int       left, right, width, top, bottom, height, pitch, size;

	R_GetGlyphInfo(glyph, &left, &right, &width, &top, &bottom, &height, &pitch);

	if (glyph->format != FT_GLYPH_FORMAT_OUTLINE)
	{
		Ren_Print("Non-outline fonts are not supported\n");
		return NULL;
	}

	size = pitch * height;

	bit2 = (FT_Bitmap *)ri.Z_Malloc(sizeof(FT_Bitmap));

	bit2->width      = width;
	bit2->rows       = height;
	bit2->pitch      = pitch;
	bit2->pixel_mode = FT_PIXEL_MODE_GRAY;
	bit2->buffer     = (unsigned char *)ri.Z_Malloc(size);
	bit2->num_grays  = 256;

	Com_Memset(bit2->buffer, 0, size);

	FT_Outline_Translate(&glyph->outline, -left, -bottom);
	FT_Outline_Get_Bitmap(ftLibrary, &glyph->outline, bit2);

	glyphOut->height = height;
	glyphOut->pitch  = pitch;
	glyphOut->top    = _TRUNC(glyph->metrics.horiBearingY) + 1;
	glyphOut->bottom = bottom;
	glyphOut->xSkip  = _TRUNC(glyph->metrics.horiAdvance) + 1;
	return bit2;
}

  /* 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 = FT_Err_Ok;


    if ( slot->format != render->glyph_format )
    {
      error = FT_THROW( 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;
  }

/* convert a slot's glyph image into a bitmap */
static FT_Error
ft_raster1_render( FT_Renderer       render,
                   FT_GlyphSlot      slot,
                   FT_Render_Mode    mode,
                   const FT_Vector*  origin )
{
    FT_Error     error;
    FT_Outline*  outline;
    FT_BBox      cbox, cbox0;
    FT_UInt      width, height, pitch;
    FT_Bitmap*   bitmap;
    FT_Memory    memory;

    FT_Raster_Params  params;


    /* check glyph image format */
    if ( slot->format != render->glyph_format )
    {
        error = Raster_Err_Invalid_Argument;
        goto Exit;
    }

    /* check rendering mode */
#ifndef FT_CONFIG_OPTION_PIC
    if ( mode != FT_RENDER_MODE_MONO )
    {
        /* raster1 is only capable of producing monochrome bitmaps */
        if ( render->clazz == &ft_raster1_renderer_class )
            return Raster_Err_Cannot_Render_Glyph;
    }
    else
    {
        /* raster5 is only capable of producing 5-gray-levels bitmaps */
        if ( render->clazz == &ft_raster5_renderer_class )
            return Raster_Err_Cannot_Render_Glyph;
    }
#else /* FT_CONFIG_OPTION_PIC */
    /* When PIC is enabled, we cannot get to the class object      */
    /* so instead we check the final character in the class name   */
    /* ("raster5" or "raster1"). Yes this is a hack.               */
    /* The "correct" thing to do is have different render function */
    /* for each of the classes.                                    */
    if ( mode != FT_RENDER_MODE_MONO )
    {
        /* raster1 is only capable of producing monochrome bitmaps */
        if ( render->clazz->root.module_name[6] == '1' )
            return Raster_Err_Cannot_Render_Glyph;
    }
    else
    {
        /* raster5 is only capable of producing 5-gray-levels bitmaps */
        if ( render->clazz->root.module_name[6] == '5' )
            return Raster_Err_Cannot_Render_Glyph;
    }
#endif /* FT_CONFIG_OPTION_PIC */

    outline = &slot->outline;

    /* translate the outline to the new origin if needed */
    if ( origin )
        FT_Outline_Translate( outline, origin->x, origin->y );

    /* compute the control box, and grid fit it */
    FT_Outline_Get_CBox( outline, &cbox0 );

    /* undocumented but confirmed: bbox values get rounded */
#if 1
    cbox.xMin = FT_PIX_ROUND( cbox0.xMin );
    cbox.yMin = FT_PIX_ROUND( cbox0.yMin );
    cbox.xMax = FT_PIX_ROUND( cbox0.xMax );
    cbox.yMax = FT_PIX_ROUND( cbox0.yMax );
#else
    cbox.xMin = FT_PIX_FLOOR( cbox.xMin );
    cbox.yMin = FT_PIX_FLOOR( cbox.yMin );
    cbox.xMax = FT_PIX_CEIL( cbox.xMax );
    cbox.yMax = FT_PIX_CEIL( cbox.yMax );
#endif

    /* in the event either width or height round to 0, */
    /* try explicitly rounding up/down. In the case of */
    /* glyphs containing only one very narrow feature, */
    /* this give the drop-out compensation in the      */
    /* in the scan conversion code to do its stuff.    */
    width  = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
    if ( width == 0 )
    {
        cbox.xMin = FT_PIX_FLOOR( cbox0.xMin );
        cbox.xMax = FT_PIX_CEIL( cbox0.xMax );

        width  = (FT_UInt)( ( cbox.xMax - cbox.xMin ) >> 6 );
    }

//.........这里部分代码省略.........
          FT_Short   vertBearingY = 0;
          FT_UShort  vertAdvance  = 0;


          ( (SFNT_Service)face->sfnt )->get_metrics( face, 1,
                                                     glyph_index,
                                                     &vertBearingY,
                                                     &vertAdvance );
          metrics->vertBearingY = vertBearingY;
          metrics->vertAdvance  = vertAdvance;
        }
        else
        {
          /* make up vertical ones */
          if ( face->os2.version != 0xFFFFU )
            metrics->vertAdvance = (FT_Pos)( face->os2.sTypoAscender -
                                             face->os2.sTypoDescender );
          else
            metrics->vertAdvance = (FT_Pos)( face->horizontal.Ascender -
                                             face->horizontal.Descender );
        }

        glyph->root.linearVertAdvance = metrics->vertAdvance;

        glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;

        glyph->root.outline.flags = 0;
        if ( size && size->root.metrics.y_ppem < 24 )
          glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;

        glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;

        /* apply the font matrix, if any */
        if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
             font_matrix.xy != 0        || font_matrix.yx != 0        )
        {
          FT_Outline_Transform( &glyph->root.outline, &font_matrix );

          metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
                                            font_matrix.xx );
          metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
                                            font_matrix.yy );
        }

        if ( font_offset.x || font_offset.y )
        {
          FT_Outline_Translate( &glyph->root.outline,
                                font_offset.x,
                                font_offset.y );

          metrics->horiAdvance += font_offset.x;
          metrics->vertAdvance += font_offset.y;
        }

        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling )
        {
          /* scale the outline and the metrics */
          FT_Int       n;
          FT_Outline*  cur     = &glyph->root.outline;
          FT_Vector*   vec     = cur->points;
          FT_Fixed     x_scale = glyph->x_scale;
          FT_Fixed     y_scale = glyph->y_scale;


          /* First of all, scale the points */
          if ( !hinting || !decoder.builder.hints_funcs )
            for ( n = cur->n_points; n > 0; n--, vec++ )
            {
              vec->x = FT_MulFix( vec->x, x_scale );
              vec->y = FT_MulFix( vec->y, y_scale );
            }

          /* Then scale the metrics */
          metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
          metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
        }

        /* compute the other metrics */
        FT_Outline_Get_CBox( &glyph->root.outline, &cbox );

        metrics->width  = cbox.xMax - cbox.xMin;
        metrics->height = cbox.yMax - cbox.yMin;

        metrics->horiBearingX = cbox.xMin;
        metrics->horiBearingY = cbox.yMax;

        if ( has_vertical_info )
          metrics->vertBearingX = metrics->horiBearingX -
                                    metrics->horiAdvance / 2;
        else
        {
          if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
            ft_synthesize_vertical_metrics( metrics,
                                            metrics->vertAdvance );
        }
      }
    }

    return error;
  }

//.........这里部分代码省略.........
     * must therefore be recomputed for each size and
     * `standard_{vertical,horizontal}_width' change.
     *
     * Ignore errors and carry on without emboldening.
     *
     */

    /* stem darkening only works well in `light' mode */
    if ( scaler.render_mode == FT_RENDER_MODE_LIGHT    &&
         ( !face->internal->no_stem_darkening        ||
           ( face->internal->no_stem_darkening < 0 &&
             !module->no_stem_darkening            ) ) )
      af_loader_embolden_glyph_in_slot( loader, face, style_metrics );

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


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

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

    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 );

      /* 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         */
      if ( writing_system_class->style_hints_apply )
      {
        error = writing_system_class->style_hints_apply(
                  glyph_index,
                  hints,
                  &gloader->base.outline,
                  style_metrics );
        if ( error )
          goto Exit;
      }

      /* we now need to adjust the metrics according to the change in */
      /* width/positioning that occurred during the hinting process   */
      if ( scaler.render_mode != FT_RENDER_MODE_LIGHT )
      {

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


    flags = load_flags | FT_LOAD_LINEAR_DESIGN;
    error = FT_Load_Glyph( face, glyph_index, 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;
      if ( !FT_Matrix_Invert( &inverse ) )
        FT_Vector_Transform( &loader->trans_delta, &inverse );
    }

    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 );

      /* 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                                 */
      {
#ifdef FT_CONFIG_OPTION_PIC
        AF_FaceGlobals         globals = loader->globals;
#endif
        AF_StyleClass          style_class = metrics->style_class;
        AF_WritingSystemClass  writing_system_class =
          AF_WRITING_SYSTEM_CLASSES_GET[style_class->writing_system];


        if ( writing_system_class->style_hints_apply )
          writing_system_class->style_hints_apply( hints,
                                                   &gloader->base.outline,
                                                   metrics );
      }

      /* we now need to adjust 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_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_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                        */

//.........这里部分代码省略.........