Bug 194371 Use page emitter framework to implement ppt emitter.
In order to keep consistent with pdf and postscript, ppt need to use page emitter framework.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
isSvg = true;
							transInput = new TranscoderInput( imageContent.getURI( ) );
						}
						imageData = imageContent.getData( );
						break;
					case IImageContent.IMAGE_NAME :
					case IImageContent.IMAGE_EXPRESSION :
						if ( imageContent.getData( ) == null
								|| imageContent.getURI( ) == null )
							return;
						if ( imageContent.getURI( ).endsWith( ".svg" ) )
						{
							isSvg = true;
							transInput = new TranscoderInput( new ByteArrayInputStream( imageContent.getData( ) ) );
						}
						imageData = imageContent.getData( );
						break;
					default :
						imageData = imageContent.getData( );
						break;
				}
			}
			if ( !isSvg )
			{
				pptOutput.write( base.encode( imageData ) );
			}
			else
			{
				JPEGTranscoder transcoder = new JPEGTranscoder( );
				transcoder.addTranscodingHint( JPEGTranscoder.KEY_QUALITY,