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Disable antialiasing in unit test

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In order to examine real colors of pixels we need to have unmodified (aliased) edges between regions drawn with different colors.
For for wxDCs backed by wxGraphicsContext (e.g. under wxGTK3) antialiasing is enabled by default and to prevent falsifying pixel colors we have to disable it prior to drawing operations.

See #17666.
This commit is contained in:
Artur Wieczorek 2017-04-14 00:10:59 +02:00
parent 34e19a7449
commit f171d48be4
1 changed files with 11 additions and 0 deletions
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11
tests/graphics/bitmap.cpp
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@ -19,6 +19,9 @@
#include "wx/bitmap.h"
#include "wx/rawbmp.h"
#include "wx/dcmemory.h"
#if wxUSE_GRAPHICS_CONTEXT
#include "wx/graphics.h"
#endif // wxUSE_GRAPHICS_CONTEXT
#define ASSERT_EQUAL_RGB(c, r, g, b) \
CPPUNIT_ASSERT_EQUAL( r, (int)c.Red() ); \
@ -95,6 +98,14 @@ void BitmapTestCase::OverlappingBlit()
// Clear to white.
{
wxMemoryDC dc(m_bmp);
#if wxUSE_GRAPHICS_CONTEXT
wxGraphicsContext* gc = dc.GetGraphicsContext();
if ( gc )
{
gc->SetAntialiasMode(wxANTIALIAS_NONE);
}
#endif // wxUSE_GRAPHICS_CONTEXT
dc.SetBackground( *wxWHITE );
dc.Clear();