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Show more information for wxImage::Scale() unit test failures

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Output the maximal difference between the differing images pixels to
show just how far are they from each other, exactly. And show the image
file name as well, for convenience.

Also run all checks instead of stopping after the first failing one.
This commit is contained in:
Vadim Zeitlin
2017-11-21 14:27:29 +01:00
parent c3dee8b0bc
commit 4ccda3959e
1 changed files with 22 additions and 24 deletions
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46
tests/image/image.cpp
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@@ -1320,8 +1320,8 @@ void ImageTestCase::BMPFlippingAndRLECompression()
}
static bool
CompareApprox(const wxImage& i1, const wxImage& i2)
static int
FindMaxChannelDiff(const wxImage& i1, const wxImage& i2)
{
if ( i1.GetWidth() != i2.GetWidth() )
return false;
@@ -1332,27 +1332,22 @@ CompareApprox(const wxImage& i1, const wxImage& i2)
const unsigned char* p1 = i1.GetData();
const unsigned char* p2 = i2.GetData();
const int numBytes = i1.GetWidth()*i1.GetHeight()*3;
int maxDiff = 0;
for ( int n = 0; n < numBytes; n++, p1++, p2++ )
{
switch ( *p1 - *p2 )
{
case -1:
case 0:
case +1:
// Accept up to one pixel difference, this happens because of
// different rounding behaviours in different compiler versions
// even under the same architecture, see the example in
// http://thread.gmane.org/gmane.comp.lib.wxwidgets.devel/151149/focus=151154
break;
default:
return false;
}
const int diff = std::abs(*p1 - *p2);
if ( diff > maxDiff )
maxDiff = diff;
}
return true;
return maxDiff;
}
// Note that we accept up to one pixel difference, this happens because of
// different rounding behaviours in different compiler versions
// even under the same architecture, see the example in
// http://thread.gmane.org/gmane.comp.lib.wxwidgets.devel/151149/focus=151154
// The 0 below can be replaced with 1 to generate, instead of comparing with,
// the test files.
#define ASSERT_IMAGE_EQUAL_TO_FILE(image, file) \
@@ -1362,13 +1357,16 @@ CompareApprox(const wxImage& i1, const wxImage& i2)
} \
else \
{ \
wxImage imageFromFile(file); \
CPPUNIT_ASSERT_MESSAGE( "Failed to load " file, imageFromFile.IsOk() ); \
CPPUNIT_ASSERT_MESSAGE \
( \
"Wrong scaled " + Catch::toString(image), \
CompareApprox(imageFromFile, image) \
); \
const wxImage imageFromFile(file); \
if ( imageFromFile.IsOk() ) \
{ \
INFO("Wrong scaled \"" << file << "\" " << Catch::toString(image)); \
CHECK(FindMaxChannelDiff(imageFromFile, image) <= 1); \
} \
else \
{ \
FAIL("Failed to load \"" << file << "\""); \
} \
}
void ImageTestCase::ScaleCompare()