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Fixed crash when saving as a monochrome TIFF image with incomplete options set.

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When setting only wxIMAGE_OPTION_TIFF_BITSPERSAMPLE to 1 the used samples per pixel (wxIMAGE_OPTION_TIFF_SAMPLESPERPIXEL) would still be set to 3. This is invalid and confuses libtiff, resulting in a crash ("possible heap corruption" during _TIFFfree using WinXP+MSVC8). Set the used samples per pixel to 1 explicitly in cases where only bits per sample is set to 1. Added a unit test to check for this problem (and verify the bits per sample from the saved image is indeed 1).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68782 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Dimitri Schoolwerth 2011-08-19 02:00:25 +00:00
parent 096c930c16
commit 0e11090ef6
2 changed files with 37 additions and 0 deletions
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8
src/common/imagtiff.cpp
View File

@ -593,7 +593,15 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
int bps = image->GetOptionInt(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE);
if ( !bps )
{
bps = 8;
}
else if (bps == 1)
{
// One bit per sample combined with 3 samples per pixel is
// not allowed and crashes libtiff.
spp = 1;
}
int compression = image->GetOptionInt(wxIMAGE_OPTION_TIFF_COMPRESSION);
if ( !compression )

29
tests/image/image.cpp
View File

@ -73,6 +73,7 @@ private:
CPPUNIT_TEST( CompareLoadedImage );
CPPUNIT_TEST( CompareSavedImage );
CPPUNIT_TEST( SavePNG );
CPPUNIT_TEST( SaveTIFF );
CPPUNIT_TEST( SaveAnimatedGIF );
CPPUNIT_TEST( ReadCorruptedTGA );
CPPUNIT_TEST( GIFComment );
@ -87,6 +88,7 @@ private:
void CompareLoadedImage();
void CompareSavedImage();
void SavePNG();
void SaveTIFF();
void SaveAnimatedGIF();
void ReadCorruptedTGA();
void GIFComment();
@ -1088,6 +1090,33 @@ void ImageTestCase::SavePNG()
}
static void TestTIFFImage(const wxString& option, int value)
{
wxImage image("horse.png");
wxMemoryOutputStream memOut;
image.SetOption(option, value);
CPPUNIT_ASSERT(image.SaveFile(memOut, wxBITMAP_TYPE_TIF));
wxMemoryInputStream memIn(memOut);
CPPUNIT_ASSERT(memIn.IsOk());
wxImage savedImage(memIn);
CPPUNIT_ASSERT(savedImage.IsOk());
WX_ASSERT_EQUAL_MESSAGE(("While checking for option %s", option),
true, savedImage.HasOption(option));
WX_ASSERT_EQUAL_MESSAGE(("While testing for %s", option),
value, savedImage.GetOptionInt(option));
}
void ImageTestCase::SaveTIFF()
{
TestTIFFImage(wxIMAGE_OPTION_TIFF_BITSPERSAMPLE, 1);
}
void ImageTestCase::SaveAnimatedGIF()
{
#if wxUSE_PALETTE