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guard against nullptr

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67899 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Stefan Csomor 2011-06-09 00:31:05 +00:00
parent 395345de7d
commit 974c115dff
1 changed files with 19 additions and 16 deletions
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35
src/osx/core/bitmap.cpp
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@ -1638,26 +1638,29 @@ bool wxMask::Create(const wxBitmap& bitmap)
size_t size = m_bytesPerRow * m_height ;
unsigned char * destdatabase = (unsigned char*) m_memBuf.GetWriteBuf( size ) ;
wxASSERT( destdatabase != NULL ) ;
memset( destdatabase , 0 , size ) ;
unsigned char * srcdata = (unsigned char*) bitmap.GetRawAccess() ;
for ( int y = 0 ; y < m_height ; ++y , destdatabase += m_bytesPerRow )
if ( destdatabase )
{
unsigned char *destdata = destdatabase ;
unsigned char r, g, b;
memset( destdatabase , 0 , size ) ;
unsigned char * srcdata = (unsigned char*) bitmap.GetRawAccess() ;
for ( int x = 0 ; x < m_width ; ++x )
for ( int y = 0 ; y < m_height ; ++y , destdatabase += m_bytesPerRow )
{
srcdata++ ;
r = *srcdata++ ;
g = *srcdata++ ;
b = *srcdata++ ;
unsigned char *destdata = destdatabase ;
unsigned char r, g, b;
if ( ( r + g + b ) > 0x10 )
*destdata++ = 0xFF ;
else
*destdata++ = 0x00 ;
for ( int x = 0 ; x < m_width ; ++x )
{
srcdata++ ;
r = *srcdata++ ;
g = *srcdata++ ;
b = *srcdata++ ;
if ( ( r + g + b ) > 0x10 )
*destdata++ = 0xFF ;
else
*destdata++ = 0x00 ;
}
}
}