A proposal for making the memory copy functions build with g++3.4.2.

Please review the patch, specially the casts it makes, and also
the boundaries and sizes.

-Shouldn't we use unsigned char* instead of char*. For arm it is already unsigned?
-Check again the casts

1 files changed, 47 insertions, 19 deletions

diff --git a/noncore/multimedia/opieplayer2/xinevideowidget.cpp b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
index b55750a..15c611f 100644
--- a/noncore/multimedia/opieplayer2/xinevideowidget.cpp
+++ b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
@@ -1,209 +1,237 @@
 
 /*
                             This file is part of the Opie Project
 
                              Copyright (c)  2002 Robert Griebl <sandman@handhelds.org>
                              Copyright (c)  2002 Holger Freyther <zecke@handhelds.org>
               =.
             .=l.
            .>+-=
  _;:,     .>    :=|.         This program is free software; you can
 .> <`_,   >  .   <=          redistribute it and/or  modify it under
 :`=1 )Y*s>-.--   :           the terms of the GNU General Public
 .="- .-=="i,     .._         License as published by the Free Software
  - .   .-<_>     .<>         Foundation; either version 2 of the License,
      ._= =}       :          or (at your option) any later version.
     .%`+i>       _;_.
     .i_,=:_.      -<s.       This program is distributed in the hope that
      +  .  -:.       =       it will be useful,  but WITHOUT ANY WARRANTY;
     : ..    .:,     . . .    without even the implied warranty of
     =_        +     =;=|`    MERCHANTABILITY or FITNESS FOR A
   _.=:.       :    :=>`:     PARTICULAR PURPOSE. See the GNU
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 
 */
 
 #include <qimage.h>
 #include <qdirectpainter_qws.h>
 #include <qgfx_qws.h>
 #include <qsize.h>
 #include <qapplication.h>
 
 #include <qpe/resource.h>
 
 #include "xinevideowidget.h"
 
 
 // 0 deg rot: copy a line from src to dst (use libc memcpy)
 
 // 180 deg rot: copy a line from src to dst reversed
 
-static inline void memcpy_rev ( void *dst, void *src, size_t len )
+/*
+ * This code relies the len be a multiply of 16bit
+ */
+static inline void memcpy_rev ( void *_dst, void *_src, size_t len )
 {
-        len >>= 1;
-
-        ((char *) src ) += ( len << 1 );
+    /*
+     * move the source to the end
+     */
+    char *src_c = static_cast<char*>(_src) + len;
+
+    /*
+     * as we copy by 16bit and not 8bit
+     * devide the length by two
+     */
+    len >>= 1;
+
+    short int* dst = static_cast<short int*>( _dst );
+    short int* src = reinterpret_cast<short int*>( src_c );
+
+    /*
+     * Increment dst after assigning
+     * Decrement src before  assigning becase we move backwards
+     */
+    while ( len-- )
+        *dst++ = *--src;
 
-        while ( len-- )
-                *((short int *) dst )++ = *--((short int *) src );
 }
 
 // 90 deg rot: copy a column from src to dst
 
-static inline void memcpy_step ( void *dst, void *src, size_t len, size_t step )
+static inline void memcpy_step ( void *_dst, void *_src, size_t len, size_t step )
 {
-        len >>= 1;
-        while ( len-- ) {
-                *((short int *) dst )++ = *((short int *) src );
-                ((char *) src ) += step;
-        }
+    short int *dst = static_cast<short int*>( _dst );
+    short int *src = static_cast<short int*>( _src );
+
+    len >>= 1;
+
+    /*
+     * Copy 16bit from src to dst and move to the next address
+     */
+    while ( len-- ) {
+        *dst++ = *src;
+        src = reinterpret_cast<short int*>(reinterpret_cast<char*>(src)+step);
+    }
 }
 
 // 270 deg rot: copy a column from src to dst reversed
 
-static inline void memcpy_step_rev ( void *dst, void *src, size_t len, size_t step )
+static inline void memcpy_step_rev ( void *_dst, void *_src, size_t len, size_t step )
 {
-        len >>= 1;
+    len >>= 1;
 
-        ((char *) src ) += ( len * step );
+    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-- ) {
-                ((char *) src ) -= step;
-                *((short int *) dst )++ = *((short int *) src );
-        }
+    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;