fix for the segfaults when displaying videos (it just had sometimes

invalid inputimages when repainting)

1 files changed, 2 insertions, 0 deletions

diff --git a/noncore/multimedia/opieplayer2/xinevideowidget.cpp b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
index 1ac9277..9e86041 100644
--- a/noncore/multimedia/opieplayer2/xinevideowidget.cpp
+++ b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
@@ -100,205 +100,207 @@ static inline void memcpy_step_rev ( void *_dst, void *_src, size_t len, size_t
     len >>= 1;
 
     char *src_c = static_cast<char*>( _src ) + (len*step);
     short int* dst = static_cast<short int*>( _dst );
     short int* src = reinterpret_cast<short int*>( src_c );
 
     while ( len-- ) {
         src_c -= step;
         src = reinterpret_cast<short int*>( src_c );
         *dst++ = *src;
     }
 }
 
 
 XineVideoWidget::XineVideoWidget ( QWidget* parent, const char* name )
         : QWidget ( parent, name, WRepaintNoErase | WResizeNoErase )
 {
         setBackgroundMode ( NoBackground );
 
         m_logo              = 0;
         m_buff              = 0;
         m_bytes_per_line_fb = qt_screen-> linestep ( );
         m_bytes_per_pixel   = ( qt_screen->depth() + 7 ) / 8;
         m_rotation          = 0;
 }
 
 
 XineVideoWidget::~XineVideoWidget ( )
 {
         delete m_logo;
 }
 
 void XineVideoWidget::clear ( )
 {
         m_buff = 0;
         repaint ( false );
 }
 
 QSize XineVideoWidget::videoSize() const
 {
     QSize s = size();
     bool fs = ( s == qApp->desktop()->size() );
 
     // if we are in fullscreen mode, do not rotate the video
     // (!! the paint routine uses m_rotation + qt_screen-> transformOrientation() !!)
     m_rotation = fs ? - qt_screen->transformOrientation() : 0;
 
     if ( fs && qt_screen->isTransformed() )
         s = qt_screen->mapToDevice( s );
 
     return s;
 }
 
 void XineVideoWidget::paintEvent ( QPaintEvent * )
 {
         if ( m_buff == 0 ) {
                 QPainter p ( this );
                 p. fillRect ( rect ( ), black );
                 if ( m_logo )
                         p. drawImage ( 0, 0, *m_logo );
         }
         else {
                 // Qt needs to be notified which areas were really updated .. strange
                 QArray <QRect> qt_bug_workaround_clip_rects;
 
                 {
                         QDirectPainter dp ( this );
 
                         int rot = dp. transformOrientation ( ) + m_rotation; // device rotation + custom rotation
 
                         uchar *fb = dp. frameBuffer ( );
                         uchar *frame = m_buff;
 
                         // where is the video frame in fb coordinates
                         QRect framerect = qt_screen-> mapToDevice ( QRect ( mapToGlobal ( m_thisframe. topLeft ( )), m_thisframe. size ( )), QSize ( qt_screen-> width ( ), qt_screen-> height ( )));
 
                         qt_bug_workaround_clip_rects. resize ( dp. numRects ( ));
 
                         for ( int i = dp. numRects ( ) - 1; i >= 0; i-- ) {
                                 const QRect &clip = dp. rect ( i );
 
                                 qt_bug_workaround_clip_rects [ i ] = qt_screen-> mapFromDevice ( clip, QSize ( qt_screen-> width ( ), qt_screen-> height ( )));
 
                                         uchar *dst = fb + ( clip. x ( ) * m_bytes_per_pixel ) + ( clip. y ( ) * m_bytes_per_line_fb ); // clip x/y in the fb
                                 uchar *src = frame;
 
                                 // Adjust the start the source data based on the rotation (xine frame)
                                 switch ( rot ) {
                                         case  0: src += ((( clip. x ( ) - framerect. x ( )) * m_bytes_per_pixel ) + (( clip. y ( ) - framerect. y ( )) * m_bytes_per_line_frame )); break;
                                         case  1: src += ((( clip. y ( ) - framerect. y ( )) * m_bytes_per_pixel ) + (( clip. x ( ) - framerect. x ( )) * m_bytes_per_line_frame ) + (( framerect. height ( ) - 1 ) * m_bytes_per_pixel )); break;
                                         case  2: src += ((( clip. x ( ) - framerect. x ( )) * m_bytes_per_pixel ) + (( clip. y ( ) - framerect. y ( )) * m_bytes_per_line_frame ) + (( framerect. height ( ) - 1 ) * m_bytes_per_line_frame )); break;
                                         case  3: src += ((( clip. y ( ) - framerect. y ( )) * m_bytes_per_pixel ) + (( clip. x ( ) - framerect. x ( )) * m_bytes_per_line_frame )); break;
                                         default: break;
                                 }
 
                                 // all of the following widths/heights are fb relative (0deg rotation)
 
                                 uint leftfill = 0;   // black border on the "left" side of the video frame
                                 uint framefill = 0;  // "width" of the video frame
                                 uint rightfill = 0;  // black border on the "right" side of the video frame
                                 uint clipwidth = clip. width ( ) * m_bytes_per_pixel;  // "width" of the current clip rect
 
                                 if ( clip. left ( ) < framerect. left ( ))
                                         leftfill = (( framerect. left ( ) - clip. left ( )) * m_bytes_per_pixel ) <? clipwidth;
                                 if ( clip. right ( ) > framerect. right ( ))
                                         rightfill = (( clip. right ( ) - framerect. right ( )) * m_bytes_per_pixel ) <? clipwidth;
 
                                 framefill = clipwidth - ( leftfill + rightfill );
 
                                 for ( int y = clip. top ( ); y <= clip. bottom ( ); y++ ) {
                                         if (( y < framerect. top ( )) || ( y > framerect. bottom ( ))) {
                                                 // "above" or "below" the video -> black
                                                 memset ( dst, 0, clipwidth );
                                         }
                                         else {
                                                 if ( leftfill )
                                                         memset ( dst, 0, leftfill ); // "left" border -> black
 
                                                 if ( framefill ) { // blit in the video frame
                                                         // see above for an explanation of the different memcpys
 
                                                         switch ( rot ) {
                                                                 case  0: memcpy ( dst + leftfill, src, framefill & ~1 ); break;
                                                                 case  1: memcpy_step ( dst + leftfill, src, framefill, m_bytes_per_line_frame ); break;
                                                                 case  2: memcpy_rev ( dst + leftfill, src, framefill ); break;
                                                                 case  3: memcpy_step_rev ( dst + leftfill, src, framefill, m_bytes_per_line_frame ); break;
                                                                 default: break;
                                                         }
                                                 }
                                                 if ( rightfill )
                                                         memset ( dst + leftfill + framefill, 0, rightfill ); // "right" border -> black
                                         }
 
                                         dst += m_bytes_per_line_fb; // advance one line in the framebuffer
 
                                         // advance one "line" in the xine frame data
                                         switch ( rot ) {
                                                         case  0: src += m_bytes_per_line_frame;break;
                                                 case  1: src -= m_bytes_per_pixel;      break;
                                                 case  2: src -= m_bytes_per_line_frame; break;
                                                 case  3: src += m_bytes_per_pixel;      break;
                                                 default: break;
                                         }
                                 }
                         }
                 }
 
                 {
                         // QVFB hack by Martin Jones
                         // We need to "touch" all affected clip rects with a normal QPainter in addition to the QDirectPainter
 
                         QPainter p ( this );
 
                         for ( int i = qt_bug_workaround_clip_rects. size ( ) - 1; i >= 0; i-- ) {
                                 p. fillRect ( QRect ( mapFromGlobal ( qt_bug_workaround_clip_rects [ i ]. topLeft ( )), qt_bug_workaround_clip_rects [ i ]. size ( )), QBrush ( NoBrush ));
                         }
                 }
         }
 }
 
 
 QImage *XineVideoWidget::logo ( ) const
 {
         return m_logo;
 }
 
 
 void XineVideoWidget::setLogo ( QImage* logo )
 {
         delete m_logo;
         m_logo = logo;
 }
 
 void XineVideoWidget::setVideoFrame ( uchar* img, int w, int h, int bpl )
 {
         bool rot90 = (( -m_rotation ) & 1 );
 
         if ( rot90 ) { // if the rotation is 90 or 270 we have to swap width / height
                 int d = w;
                 w = h;
                 h = d;
         }
 
         m_lastframe = m_thisframe;
         m_thisframe. setRect (( width ( ) - w ) / 2, ( height ( ) - h ) / 2, w , h );
 
         m_buff                 = img;
         m_bytes_per_line_frame = bpl;
 
         // only repaint the area that *really* needs to be repainted
 
         repaint ((( m_thisframe & m_lastframe ) != m_lastframe ) ? m_lastframe : m_thisframe, false );
+        // ensure that we always have a valid frame!
+        m_buff = 0;
 }
 
 void XineVideoWidget::resizeEvent ( QResizeEvent * )
 {
     emit videoResized( videoSize() );
 }
 
 
 void XineVideoWidget::mouseReleaseEvent ( QMouseEvent * /*me*/ )
 {
         emit clicked();
 }