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fixing truncation error in GetSubBitmap

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fixes #18362
This commit is contained in:
Stefan Csomor
2019-03-17 12:19:53 +01:00
parent cbaab700d0
commit cfded96627
1 changed files with 2 additions and 2 deletions
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4
src/osx/core/bitmap.cpp
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@@ -1026,8 +1026,8 @@ wxBitmap wxBitmap::GetSubBitmap(const wxRect &rect) const
{ {
int sourcelinesize = GetBitmapData()->GetBytesPerRow() ; int sourcelinesize = GetBitmapData()->GetBytesPerRow() ;
int destlinesize = ret.GetBitmapData()->GetBytesPerRow() ; int destlinesize = ret.GetBitmapData()->GetBytesPerRow() ;
unsigned char *source = sourcedata + int(rect.x * scale * 4 + rect.y *scale * sourcelinesize) ; unsigned char* source = sourcedata + size_t(rect.x * scale) * 4 + size_t(rect.y * scale) * sourcelinesize;
unsigned char *dest = destdata ; unsigned char* dest = destdata;
for (int yy = 0; yy < destheight; ++yy, source += sourcelinesize , dest += destlinesize) for (int yy = 0; yy < destheight; ++yy, source += sourcelinesize , dest += destlinesize)
{ {