Bug 196272 Text position is incorrect in postscript and ppt.
Text position need to be ajusted according to baseline position.
engine/org.eclipse.birt.report.engine.emitter.postscript/src/org/eclipse/birt/report/engine/emitter/postscript/PostscriptWriter.java
out.print( " 0 0 -" );
		out.print( originalHeight );
		out.print( " 0 " );
		out.print( 0 );
		out.println( "]" );
		out.println( "{currentfile pix readhexstring pop}" );
		out.println( "false 3 colorimage" );
		out.println( "" );
		byte[] sb = new byte[originalHeight * originalWidth * 6];
		int offset = 0;
		for ( int i = 0; i < originalHeight; i++ )
		{
			if ( bgcolor == null )
			{
				for ( int j = 0; j < originalWidth; j++ )
				{
					int pixel = imageSource.getRGB( j, i );
					int red = ( pixel & 0xff0000 ) >> 16;
					int green = ( pixel & 0xff00 ) >> 8;
					int blue = pixel & 0xff;
					offset = toBytes( offset, sb, red );
					offset = toBytes( offset, sb, green );
					offset = toBytes( offset, sb, blue );
				}
			}
			else
			{
				
			}
		}