git.sesse.net Git - mlt/blob - src/modules/qimage/kdenlivetitle_wrapper.cpp

   1 /*
   2  * kdenlivetitle_wrapper.cpp -- kdenlivetitle wrapper
   3  * Copyright (c) 2009 Marco Gittler <g.marco@freenet.de>
   4  * Copyright (c) 2009 Jean-Baptiste Mardelle <jb@kdenlive.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "kdenlivetitle_wrapper.h"
  22
  23 #include <QtGui/QImage>
  24 #include <QtGui/QPainter>
  25 #include <QtCore/QDebug>
  26 #include <QtGui/QApplication>
  27 #include <QtCore/QMutex>
  28 #include <QtGui/QGraphicsScene>
  29 #include <QtGui/QGraphicsTextItem>
  30 #include <QtSvg/QGraphicsSvgItem>
  31 #include <QtSvg/QSvgRenderer>
  32 #include <QtGui/QTextCursor>
  33 #include <QtGui/QTextDocument>
  34 #include <QtGui/QStyleOptionGraphicsItem>
  35
  36 #include <QtCore/QString>
  37
  38 #include <QtXml/QDomElement>
  39 #include <QtCore/QRectF>
  40 #include <QtGui/QColor>
  41 #include <QtGui/QWidget>
  42 #include <framework/mlt_log.h>
  43
  44 #if QT_VERSION >= 0x040600
  45 #include <QtGui/QGraphicsEffect>
  46 #include <QtGui/QGraphicsBlurEffect>
  47 #include <QtGui/QGraphicsDropShadowEffect>
  48 #endif
  49
  50 static QApplication *app = NULL;
  51
  52 class ImageItem: public QGraphicsItem
  53 {
  54 public:
  55     ImageItem(QImage img)
  56     {
  57         m_img = img;
  58     }
  59     QImage m_img;
  60
  61
  62 protected:
  63
  64 virtual QRectF boundingRect() const
  65 {
  66     return QRectF(0, 0, m_img.width(), m_img.height());
  67 }
  68
  69 virtual void paint( QPainter *painter,
  70                        const QStyleOptionGraphicsItem * /*option*/,
  71                        QWidget* )
  72 {
  73     painter->setRenderHint(QPainter::SmoothPixmapTransform, true);
  74     painter->drawImage(QPoint(), m_img);
  75 }
  76 };
  77
  78
  79 QRectF stringToRect( const QString & s )
  80 {
  81
  82         QStringList l = s.split( ',' );
  83         if ( l.size() < 4 )
  84                 return QRectF();
  85         return QRectF( l.at( 0 ).toDouble(), l.at( 1 ).toDouble(), l.at( 2 ).toDouble(), l.at( 3 ).toDouble() ).normalized();
  86 }
  87
  88 QColor stringToColor( const QString & s )
  89 {
  90         QStringList l = s.split( ',' );
  91         if ( l.size() < 4 )
  92                 return QColor();
  93         return QColor( l.at( 0 ).toInt(), l.at( 1 ).toInt(), l.at( 2 ).toInt(), l.at( 3 ).toInt() );
  94         ;
  95 }
  96 QTransform stringToTransform( const QString& s )
  97 {
  98         QStringList l = s.split( ',' );
  99         if ( l.size() < 9 )
 100                 return QTransform();
 101         return QTransform(
 102                    l.at( 0 ).toDouble(), l.at( 1 ).toDouble(), l.at( 2 ).toDouble(),
 103                    l.at( 3 ).toDouble(), l.at( 4 ).toDouble(), l.at( 5 ).toDouble(),
 104                    l.at( 6 ).toDouble(), l.at( 7 ).toDouble(), l.at( 8 ).toDouble()
 105                );
 106 }
 107
 108 static void qscene_delete( void *data )
 109 {
 110         QGraphicsScene *scene = ( QGraphicsScene * )data;
 111         if (scene) delete scene;
 112         scene = NULL;
 113 }
 114
 115
 116 void loadFromXml( mlt_producer producer, QGraphicsScene *scene, const char *templateXml, const char *templateText )
 117 {
 118         scene->clear();
 119         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 120         QDomDocument doc;
 121         QString data = QString::fromUtf8(templateXml);
 122         QString replacementText = QString::fromUtf8(templateText);
 123         doc.setContent(data);
 124         QDomElement title = doc.documentElement();
 125
 126         // Check for invalid title
 127         if ( title.isNull() || title.tagName() != "kdenlivetitle" ) return;
 128
 129         // Check title locale
 130         if ( title.hasAttribute( "LC_NUMERIC" ) ) {
 131             QString locale = title.attribute( "LC_NUMERIC" );
 132             QLocale::setDefault( locale );
 133         }
 134
 135         int originalWidth;
 136         int originalHeight;
 137         if ( title.hasAttribute("width") ) {
 138             originalWidth = title.attribute("width").toInt();
 139             originalHeight = title.attribute("height").toInt();
 140             scene->setSceneRect(0, 0, originalWidth, originalHeight);
 141         }
 142         else {
 143             originalWidth = scene->sceneRect().width();
 144             originalHeight = scene->sceneRect().height();
 145         }
 146         if ( title.hasAttribute( "out" ) ) {
 147             mlt_properties_set_position( producer_props, "_animation_out", title.attribute( "out" ).toDouble() );
 148         }
 149         else {
 150             mlt_properties_set_position( producer_props, "_animation_out", mlt_producer_get_out( producer ) );
 151         }
 152
 153         mlt_properties_set_int( producer_props, "_original_width", originalWidth );
 154         mlt_properties_set_int( producer_props, "_original_height", originalHeight );
 155
 156         QDomNode node;
 157         QDomNodeList items = title.elementsByTagName("item");
 158         for ( int i = 0; i < items.count(); i++ )
 159         {
 160                 QGraphicsItem *gitem = NULL;
 161                 node = items.item( i );
 162                 QDomNamedNodeMap nodeAttributes = node.attributes();
 163                 int zValue = nodeAttributes.namedItem( "z-index" ).nodeValue().toInt();
 164                 if ( zValue > -1000 )
 165                 {
 166                         if ( nodeAttributes.namedItem( "type" ).nodeValue() == "QGraphicsTextItem" )
 167                         {
 168                                 QDomNamedNodeMap txtProperties = node.namedItem( "content" ).attributes();
 169                                 QFont font( txtProperties.namedItem( "font" ).nodeValue() );
 170                                 QDomNode propsNode = txtProperties.namedItem( "font-bold" );
 171                                 if ( !propsNode.isNull() )
 172                                 {
 173                                         // Old: Bold/Not bold.
 174                                         font.setBold( propsNode.nodeValue().toInt() );
 175                                 }
 176                                 else
 177                                 {
 178                                         // New: Font weight (QFont::)
 179                                         font.setWeight( txtProperties.namedItem( "font-weight" ).nodeValue().toInt() );
 180                                 }
 181                                 font.setItalic( txtProperties.namedItem( "font-italic" ).nodeValue().toInt() );
 182                                 font.setUnderline( txtProperties.namedItem( "font-underline" ).nodeValue().toInt() );
 183                                 // Older Kdenlive version did not store pixel size but point size
 184                                 if ( txtProperties.namedItem( "font-pixel-size" ).isNull() )
 185                                 {
 186                                         QFont f2;
 187                                         f2.setPointSize( txtProperties.namedItem( "font-size" ).nodeValue().toInt() );
 188                                         font.setPixelSize( QFontInfo( f2 ).pixelSize() );
 189                                 }
 190                                 else
 191                                         font.setPixelSize( txtProperties.namedItem( "font-pixel-size" ).nodeValue().toInt() );
 192                                 QColor col( stringToColor( txtProperties.namedItem( "font-color" ).nodeValue() ) );
 193                                 QString text = node.namedItem( "content" ).firstChild().nodeValue();
 194                                 if ( !replacementText.isEmpty() )
 195                                 {
 196                                         text = text.replace( "%s", replacementText );
 197                                 }
 198                                 QGraphicsTextItem *txt = scene->addText(text, font);
 199                                 if (txtProperties.namedItem("font-outline").nodeValue().toDouble()>0.0){
 200                                         qRegisterMetaType<QTextCursor>( "QTextCursor" );
 201                                         QTextCursor cursor(txt->document());
 202                                         cursor.select(QTextCursor::Document);
 203                                         QTextCharFormat format;
 204                                         format.setTextOutline(
 205                                                         QPen(QColor( stringToColor( txtProperties.namedItem( "font-outline-color" ).nodeValue() ) ),
 206                                                         txtProperties.namedItem("font-outline").nodeValue().toDouble(),
 207                                                         Qt::SolidLine,Qt::RoundCap,Qt::RoundJoin)
 208                                         );
 209                                         format.setForeground(QBrush(col));
 210
 211                                         cursor.mergeCharFormat(format);
 212                                 } else {
 213                                         txt->setDefaultTextColor( col );
 214                                 }
 215
 216                                 // Effects
 217                                 if (!txtProperties.namedItem( "typewriter" ).isNull()) {
 218                                         // typewriter effect
 219                                         mlt_properties_set_int( producer_props, "_animated", 1 );
 220                                         QStringList effetData = QStringList() << "typewriter" << text << txtProperties.namedItem( "typewriter" ).nodeValue();
 221                                         txt->setData(0, effetData);
 222                                         if ( !txtProperties.namedItem( "textwidth" ).isNull() )
 223                                                 txt->setData( 1, txtProperties.namedItem( "textwidth" ).nodeValue() );
 224                                 }
 225
 226                                 if ( txtProperties.namedItem( "alignment" ).isNull() == false )
 227                                 {
 228                                         txt->setTextWidth( txt->boundingRect().width() );
 229                                         QTextOption opt = txt->document()->defaultTextOption ();
 230                                         opt.setAlignment(( Qt::Alignment ) txtProperties.namedItem( "alignment" ).nodeValue().toInt() );
 231                                         txt->document()->setDefaultTextOption (opt);
 232                                 }
 233                                         if ( !txtProperties.namedItem( "kdenlive-axis-x-inverted" ).isNull() )
 234                                 {
 235                                         //txt->setData(OriginXLeft, txtProperties.namedItem("kdenlive-axis-x-inverted").nodeValue().toInt());
 236                                 }
 237                                 if ( !txtProperties.namedItem( "kdenlive-axis-y-inverted" ).isNull() )
 238                                 {
 239                                         //txt->setData(OriginYTop, txtProperties.namedItem("kdenlive-axis-y-inverted").nodeValue().toInt());
 240                                 }
 241                                         gitem = txt;
 242                         }
 243                         else if ( nodeAttributes.namedItem( "type" ).nodeValue() == "QGraphicsRectItem" )
 244                         {
 245                                 QString rect = node.namedItem( "content" ).attributes().namedItem( "rect" ).nodeValue();
 246                                 QString br_str = node.namedItem( "content" ).attributes().namedItem( "brushcolor" ).nodeValue();
 247                                 QString pen_str = node.namedItem( "content" ).attributes().namedItem( "pencolor" ).nodeValue();
 248                                 double penwidth = node.namedItem( "content" ).attributes().namedItem( "penwidth") .nodeValue().toDouble();
 249                                 QGraphicsRectItem *rec = scene->addRect( stringToRect( rect ), QPen( QBrush( stringToColor( pen_str ) ), penwidth, Qt::SolidLine, Qt::SquareCap, Qt::RoundJoin ), QBrush( stringToColor( br_str ) ) );
 250                                 gitem = rec;
 251                         }
 252                         else if ( nodeAttributes.namedItem( "type" ).nodeValue() == "QGraphicsPixmapItem" )
 253                         {
 254                                 const QString url = node.namedItem( "content" ).attributes().namedItem( "url" ).nodeValue();
 255                                 const QString base64 = items.item(i).namedItem("content").attributes().namedItem("base64").nodeValue();
 256                                 QImage img;
 257                                 if (base64.isEmpty()){
 258                                         img.load(url);
 259                                 }else{
 260                                         img.loadFromData(QByteArray::fromBase64(base64.toAscii()));
 261                                 }
 262                                 ImageItem *rec = new ImageItem(img);
 263                                 scene->addItem( rec );
 264                                 gitem = rec;
 265                         }
 266                         else if ( nodeAttributes.namedItem( "type" ).nodeValue() == "QGraphicsSvgItem" )
 267                         {
 268                                 QString url = items.item(i).namedItem("content").attributes().namedItem("url").nodeValue();
 269                                 QString base64 = items.item(i).namedItem("content").attributes().namedItem("base64").nodeValue();
 270                                 QGraphicsSvgItem *rec = NULL;
 271                                 if (base64.isEmpty()){
 272                                         rec = new QGraphicsSvgItem(url);
 273                                 }else{
 274                                         rec = new QGraphicsSvgItem();
 275                                         QSvgRenderer *renderer= new QSvgRenderer(QByteArray::fromBase64(base64.toAscii()), rec );
 276                                         rec->setSharedRenderer(renderer);
 277                                 }
 278                                 if (rec){
 279                                         scene->addItem(rec);
 280                                         gitem = rec;
 281                                 }
 282                         }
 283                 }
 284                 //pos and transform
 285                 if ( gitem )
 286                 {
 287                         QPointF p( node.namedItem( "position" ).attributes().namedItem( "x" ).nodeValue().toDouble(),
 288                                    node.namedItem( "position" ).attributes().namedItem( "y" ).nodeValue().toDouble() );
 289                         gitem->setPos( p );
 290                         gitem->setTransform( stringToTransform( node.namedItem( "position" ).firstChild().firstChild().nodeValue() ) );
 291                         int zValue = nodeAttributes.namedItem( "z-index" ).nodeValue().toInt();
 292                         gitem->setZValue( zValue );
 293
 294 #if QT_VERSION >= 0x040600
 295                         // effects
 296                         QDomNode eff = items.item(i).namedItem("effect");
 297                         if (!eff.isNull()) {
 298                                 QDomElement e = eff.toElement();
 299                                 if (e.attribute("type") == "blur") {
 300                                         QGraphicsBlurEffect *blur = new QGraphicsBlurEffect();
 301                                         blur->setBlurRadius(e.attribute("blurradius").toInt());
 302                                         gitem->setGraphicsEffect(blur);
 303                                 }
 304                                 else if (e.attribute("type") == "shadow") {
 305                                         QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect();
 306                                         shadow->setBlurRadius(e.attribute("blurradius").toInt());
 307                                         shadow->setOffset(e.attribute("xoffset").toInt(), e.attribute("yoffset").toInt());
 308                                         gitem->setGraphicsEffect(shadow);
 309                                 }
 310                         }
 311 #endif
 312                 }
 313         }
 314
 315         QDomNode n = title.firstChildElement("background");
 316         if (!n.isNull()) {
 317                 QColor color = QColor( stringToColor( n.attributes().namedItem( "color" ).nodeValue() ) );
 318                 if (color.alpha() > 0) {
 319                         QGraphicsRectItem *rec = scene->addRect(0, 0, scene->width(), scene->height() , QPen( Qt::NoPen ), QBrush( color ) );
 320                         rec->setZValue(-1100);
 321                 }
 322
 323         }
 324
 325         QString startRect;
 326         n = title.firstChildElement( "startviewport" );
 327         // Check if node exists, if it has an x attribute, it is an old version title, don't use viewport
 328         if (!n.isNull() && !n.toElement().hasAttribute("x"))
 329         {
 330                 startRect = n.attributes().namedItem( "rect" ).nodeValue();
 331         }
 332         n = title.firstChildElement( "endviewport" );
 333         // Check if node exists, if it has an x attribute, it is an old version title, don't use viewport
 334         if (!n.isNull() && !n.toElement().hasAttribute("x"))
 335         {
 336                 QString rect = n.attributes().namedItem( "rect" ).nodeValue();
 337                 if (startRect != rect)
 338                         mlt_properties_set( producer_props, "_endrect", rect.toUtf8().data() );
 339         }
 340         if (!startRect.isEmpty()) {
 341                 mlt_properties_set( producer_props, "_startrect", startRect.toUtf8().data() );
 342         }
 343         return;
 344 }
 345
 346
 347 void drawKdenliveTitle( producer_ktitle self, mlt_frame frame, int width, int height, double position, int force_refresh )
 348 {
 349         // Obtain the producer
 350         mlt_producer producer = &self->parent;
 351         mlt_profile profile = mlt_service_profile ( MLT_PRODUCER_SERVICE( producer ) ) ;
 352         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 353
 354         // Obtain properties of frame
 355         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 356
 357         pthread_mutex_lock( &self->mutex );
 358
 359         // Check if user wants us to reload the image
 360         if ( mlt_properties_get( producer_props, "_animated" ) != NULL || force_refresh == 1 || width != self->current_width || height != self->current_height || mlt_properties_get( producer_props, "_endrect" ) != NULL )
 361         {
 362                 //mlt_cache_item_close( self->image_cache );
 363                 self->current_image = NULL;
 364                 mlt_properties_set_data( producer_props, "cached_image", NULL, 0, NULL, NULL );
 365                 mlt_properties_set_int( producer_props, "force_reload", 0 );
 366         }
 367
 368         if (self->current_image == NULL) {
 369                 // restore QGraphicsScene
 370                 QGraphicsScene *scene = static_cast<QGraphicsScene *> (mlt_properties_get_data( producer_props, "qscene", NULL ));
 371
 372                 if ( force_refresh == 1 && scene )
 373                 {
 374                         scene = NULL;
 375                         mlt_properties_set_data( producer_props, "qscene", NULL, 0, NULL, NULL );
 376                 }
 377
 378                 if ( scene == NULL )
 379                 {
 380                         int argc = 1;
 381                         char* argv[1];
 382                         argv[0] = (char*) "xxx";
 383
 384                         // Warning: all Qt graphic objects (QRect, ...) must be initialized AFTER
 385                         // the QApplication is created, otherwise their will be NULL
 386
 387                         if ( app == NULL ) {
 388                                 if ( qApp ) {
 389                                         app = qApp;
 390                                 }
 391                                 else {
 392 #ifdef linux
 393                                         if ( getenv("DISPLAY") == 0 )
 394                                         {
 395                                                 mlt_log_panic( MLT_PRODUCER_SERVICE( producer ), "Error, cannot render titles without an X11 environment.\nPlease either run melt from an X session or use a fake X server like xvfb:\nxvfb-run -a melt (...)\n" );
 396                                                 pthread_mutex_unlock( &self->mutex );
 397                                                 return;
 398                                         }
 399 #endif
 400                                         app = new QApplication( argc, argv );
 401                                         const char *localename = mlt_properties_get_lcnumeric( MLT_SERVICE_PROPERTIES( MLT_PRODUCER_SERVICE( producer ) ) );
 402                                         QLocale::setDefault( QLocale( localename ) );
 403                                 }
 404                         }
 405                         scene = new QGraphicsScene();
 406                         scene->setItemIndexMethod( QGraphicsScene::NoIndex );
 407                         scene->setSceneRect(0, 0, mlt_properties_get_int( properties, "width" ), mlt_properties_get_int( properties, "height" ));
 408                         if ( mlt_properties_get( producer_props, "resource" ) && mlt_properties_get( producer_props, "resource" )[0] != '\0' )
 409                         {
 410                                 // The title has a resource property, so we read all properties from the resource.
 411                                 // Do not serialize the xmldata
 412                                 loadFromXml( producer, scene, mlt_properties_get( producer_props, "_xmldata" ), mlt_properties_get( producer_props, "templatetext" ) );
 413                         }
 414                         else
 415                         {
 416                                 // The title has no resource, all data should be serialized
 417                                 loadFromXml( producer, scene, mlt_properties_get( producer_props, "xmldata" ), mlt_properties_get( producer_props, "templatetext" ) );
 418
 419                         }
 420                         mlt_properties_set_data( producer_props, "qscene", scene, 0, ( mlt_destructor )qscene_delete, NULL );
 421                 }
 422
 423                 QRectF start = stringToRect( QString( mlt_properties_get( producer_props, "_startrect" ) ) );
 424                 QRectF end = stringToRect( QString( mlt_properties_get( producer_props, "_endrect" ) ) );
 425
 426                 int originalWidth = mlt_properties_get_int( producer_props, "_original_width" );
 427                 int originalHeight= mlt_properties_get_int( producer_props, "_original_height" );
 428                 const QRectF source( 0, 0, width, height );
 429                 if (start.isNull()) {
 430                     start = QRectF( 0, 0, originalWidth, originalHeight );
 431                 }
 432
 433                 // Effects
 434                 QList <QGraphicsItem *> items = scene->items();
 435                 QGraphicsTextItem *titem = NULL;
 436                 for (int i = 0; i < items.count(); i++) {
 437                     titem = static_cast <QGraphicsTextItem*> ( items.at( i ) );
 438                     if (titem && !titem->data( 0 ).isNull()) {
 439                             QStringList params = titem->data( 0 ).toStringList();
 440                             if (params.at( 0 ) == "typewriter" ) {
 441                                     // typewriter effect has 2 param values:
 442                                     // the keystroke delay and a start offset, both in frames
 443                                     QStringList values = params.at( 2 ).split( ";" );
 444                                     int interval = qMax( 0, ( ( int ) position - values.at( 1 ).toInt()) / values.at( 0 ).toInt() );
 445                                     qRegisterMetaType<QTextCursor>( "QTextCursor" );
 446                                     QTextCursor cursor = titem->textCursor();
 447                                     cursor.movePosition(QTextCursor::EndOfBlock);
 448                                     // get the font format
 449                                     QTextCharFormat format = cursor.charFormat();
 450                                     cursor.select(QTextCursor::Document);
 451                                     QString txt = params.at( 1 ).left( interval );
 452                                     // If the string to insert is empty, insert a space / linebreak so that we don't loose
 453                                     // formatting infos for the next iterations
 454                                     int lines = params.at( 1 ).count( '\n' );
 455                                     QString empty = " ";
 456                                     for (int i = 0; i < lines; i++)
 457                                             empty.append( "\n " );
 458                                     cursor.insertText( txt.isEmpty() ? empty : txt, format );
 459                                     if ( !titem->data( 1 ).isNull() )
 460                                           titem->setTextWidth( titem->data( 1 ).toDouble() );
 461                             }
 462                     }
 463                 }
 464
 465                 //must be extracted from kdenlive title
 466                 QImage img( width, height, QImage::Format_ARGB32 );
 467                 img.fill( 0 );
 468                 QPainter p1;
 469                 p1.begin( &img );
 470                 p1.setRenderHints( QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::HighQualityAntialiasing );
 471                 //| QPainter::SmoothPixmapTransform );
 472                 mlt_position anim_out = mlt_properties_get_position( producer_props, "_animation_out" );
 473
 474                 if (end.isNull())
 475                 {
 476                         scene->render( &p1, source, start, Qt::IgnoreAspectRatio );
 477                 }
 478                 else if ( position > anim_out ) {
 479                         scene->render( &p1, source, end, Qt::IgnoreAspectRatio );
 480                 }
 481                 else {
 482                         double percentage = 0;
 483                         if ( position && anim_out )
 484                                 percentage = position / anim_out;
 485                         QPointF topleft = start.topLeft() + ( end.topLeft() - start.topLeft() ) * percentage;
 486                         QPointF bottomRight = start.bottomRight() + ( end.bottomRight() - start.bottomRight() ) * percentage;
 487                         const QRectF r1( topleft, bottomRight );
 488                         scene->render( &p1, source, r1, Qt::IgnoreAspectRatio );
 489                         if ( profile && !profile->progressive ){
 490                                 int line=0;
 491                                 double percentage_next_filed    = ( position + 0.5 ) / anim_out;
 492                                 QPointF topleft_next_field = start.topLeft() + ( end.topLeft() - start.topLeft() ) * percentage_next_filed;
 493                                 QPointF bottomRight_next_field = start.bottomRight() + ( end.bottomRight() - start.bottomRight() ) * percentage_next_filed;
 494                                 const QRectF r2( topleft_next_field, bottomRight_next_field );
 495                                 QImage img1( width, height, QImage::Format_ARGB32 );
 496                                 img1.fill( 0 );
 497                                 QPainter p2;
 498                                 p2.begin(&img1);
 499                                 p2.setRenderHints( QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::HighQualityAntialiasing );
 500                                 scene->render(&p2,source,r2,  Qt::IgnoreAspectRatio );
 501                                 p2.end();
 502                                 int next_field_line = (  mlt_properties_get_int( producer_props, "top_field_first" ) ? 1 : 0 );
 503                                 for (line = next_field_line ;line<height;line+=2){
 504                                                 memcpy(img.scanLine(line),img1.scanLine(line),img.bytesPerLine());
 505                                 }
 506
 507                         }
 508                 }
 509                 p1.end();
 510
 511                 int size = width * height * 4;
 512                 uint8_t *pointer=img.bits();
 513                 QRgb* src = ( QRgb* ) pointer;
 514                 self->current_image = ( uint8_t * )mlt_pool_alloc( size );
 515                 uint8_t *dst = self->current_image;
 516
 517                 for ( int i = 0; i < width * height * 4; i += 4 )
 518                 {
 519                         *dst++=qRed( *src );
 520                         *dst++=qGreen( *src );
 521                         *dst++=qBlue( *src );
 522                         *dst++=qAlpha( *src );
 523                         src++;
 524                 }
 525
 526                 mlt_properties_set_data( producer_props, "cached_image", self->current_image, size, mlt_pool_release, NULL );
 527                 self->current_width = width;
 528                 self->current_height = height;
 529         }
 530
 531         pthread_mutex_unlock( &self->mutex );
 532         mlt_properties_set_int( properties, "width", self->current_width );
 533         mlt_properties_set_int( properties, "height", self->current_height );
 534 }
 535
 536