ADDITIONAL SYSTEM INFORMATION :
Windows version has this problem.
If you copy the font to linux, you can find that linux version also has this problem.

A DESCRIPTION OF THE PROBLEM :
I draw some chars with graphics. I found if I use some font, the size of a chinese char, bold style is smaller then plain style, and the shape look strange. For example, font is (宋体, 14), char is 泰, I checked size of pixcel on screen：
plain style: 15x16.
bold style: 15x15.
In fact, italic style has same problem.

REGRESSION : Last worked in version 8

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1, run the code width plain style font.
2, run the code width plain bold font.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
We hope the char on screen become bold only
ACTUAL -
1, the size of char is smaller.
2, the shape look strange.

---------- BEGIN SOURCE ----------
package taishan;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;

@SuppressWarnings("serial")
public class BoldFontFrame extends TFrame
{
    private final static String FONT_NAME_SONGTI = "宋体";
    private final static int FONT_SIZE = 14;

private final static char[] TAISHAN = "泰山".toCharArray();

public BoldFontFrame()
{
this.getContentPane().setBackground(Color.WHITE);
Font testFont = new Font(FONT_NAME_SONGTI, Font.BOLD, FONT_SIZE);
//testFont = new Font(FONT_NAME_SONGTI, Font.PLAIN, FONT_SIZE);
this.setFont(testFont);

}

@Override
    public void paint(Graphics g)
    {
super.paint(g);

g.drawChars(TAISHAN, 0, TAISHAN.length, 30, 30);

    }

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
freetypeScaler.c, about 469, comment or remove this code, would resolve this problem:
!context->doBold

And if you remove (!context->doItalize), the italic style has no effect. It because freetype doesn't implement this function. I had send my code to freetype, he said vertical italic should be implemented same time:
1. ftbitmap.h
  FT_EXPORT( FT_Error )
  FT_Bitmap_Italic(
                      FT_Library library,
                      FT_Bitmap* bitmap,
                      FT_Pos xStrength,
                      FT_Pos yStrength );

2. ftbitmap.c

#define TAISHAN_FONT_ITALIC_VALUE 0.20F

  FT_EXPORT_DEF( FT_Error )
  FT_Bitmap_Italic( FT_Library library,
                      FT_Bitmap* bitmap,
                      FT_Pos xStrength,
                      FT_Pos yStrength )
  {
    FT_Error error;
    FT_Int pitch;
    FT_UInt y;
    FT_Int xstr, ystr;

    unsigned char* p = NULL;
    int i = 0;
    int newWidth = 0;

    if ( !library )
      return FT_THROW( Invalid_Library_Handle );

    if ( !bitmap || !bitmap->buffer )
      return FT_THROW( Invalid_Argument );

    if ( ( ( FT_PIX_ROUND( xStrength ) >> 6 ) > FT_INT_MAX ) ||
         ( ( FT_PIX_ROUND( yStrength ) >> 6 ) > FT_INT_MAX ) )
      return FT_THROW( Invalid_Argument );

    xstr = (FT_Int)FT_PIX_ROUND( xStrength ) >> 6;
    ystr = (FT_Int)FT_PIX_ROUND( yStrength ) >> 6;

    if ( xstr == 0 && ystr == 0 )
      return FT_Err_Ok;
    else if ( xstr < 0 || ystr < 0 )
      return FT_THROW( Invalid_Argument );

    switch ( bitmap->pixel_mode )
    {
    case FT_PIXEL_MODE_GRAY2:
    case FT_PIXEL_MODE_GRAY4:
      {
        FT_Bitmap tmp;


        /* convert to 8bpp */
        FT_Bitmap_Init( &tmp );
        error = FT_Bitmap_Convert( library, bitmap, &tmp, 1 );
        if ( error )
          return error;

        FT_Bitmap_Done( library, bitmap );
        *bitmap = tmp;
      }
      break;

    case FT_PIXEL_MODE_MONO:
      if ( xstr > 8 )
        xstr = 8;
      break;

    case FT_PIXEL_MODE_LCD:
      xstr *= 3;
      break;

    case FT_PIXEL_MODE_LCD_V:
      ystr *= 3;
      break;

    case FT_PIXEL_MODE_BGRA:
      /* We don't embolden color glyphs. */
      return FT_Err_Ok;
    }

    error = ft_bitmap_assure_buffer( library->memory, bitmap,
                                     (FT_UInt)xstr, (FT_UInt)ystr );
    if ( error )
      return error;

    /* take care of bitmap flow */
    pitch = bitmap->pitch;
    if ( pitch > 0 )
    {
        p = bitmap->buffer;
    }
    else
    {
        pitch = -pitch;
        p = bitmap->buffer + (FT_UInt)pitch * ( bitmap->rows - 1 );
        return error;
    }

    newWidth = (int)(ceil(bitmap->width * (1+TAISHAN_FONT_ITALIC_VALUE)) + (FT_UInt)xstr);
    if (newWidth > (pitch*8))
    {
        newWidth = pitch * 8;
    }

    /* for each row */
    for ( y = 0; y < bitmap->rows; y++ )
    {
      int offset = (int)((bitmap->rows - y) * TAISHAN_FONT_ITALIC_VALUE);
      if (offset == 0)
      {
          break;
      }

      for (i=pitch-1; i>=0; i--)
      {
          p[i] = (p[i] >> offset);
          if (i>0)
          {
              p[i] = p[i] | (p[i-1] << (8-offset));
          }
      }

      p += bitmap->pitch;
    }

    bitmap->width = newWidth;
    bitmap->rows += (FT_UInt)ystr;
    /* bitmap->pitch = newPitch; */
    /* bitmap->width += (FT_UInt)xstr; */

    return FT_Err_Ok;
  }

3. ftsynth.c
  FT_EXPORT_DEF( void )
  FT_GlyphSlot_Oblique( FT_GlyphSlot slot )
  {
    FT_Matrix transform;
    FT_Outline* outline;
    FT_Library library;
    FT_Face face;
    FT_Pos xstr, ystr;

    if ( !slot )
      return;

    face = slot->face;
    if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
    {
        library = slot->library;
        
        /* some reasonable strength */
        xstr = FT_MulFix( face->units_per_EM,
                          face->size->metrics.y_scale ) / 24;
        ystr = xstr;
        xstr &= ~63;
        if ( xstr == 0 )
        {
            xstr = 1 << 6;
        }
        ystr &= ~63;

        /* FT_GlyphSlot_Own_Bitmap( slot ); */
        FT_Bitmap_Italic(library, &slot->bitmap, xstr, ystr );
        return;
    }

    /* we don't touch the advance width */

    /* For italic, simply apply a shear transform, with an angle */
    /* of about 12 degrees. */

    transform.xx = 0x10000L;
    transform.yx = 0x00000L;

    transform.xy = 0x0366AL;
    transform.yy = 0x10000L;
 
    outline = &slot->outline;

    FT_Outline_Transform( outline, &transform );
  }

FREQUENCY : always