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
@@ -1,145 +1,173 @@
 
 /*
                             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 ( )));