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Add to the test suite a test of setting non-rectangular clipping region

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Added a test of creating triangular clipping region (with wxDC::SetDeviceClippingRegion).

See #17609
This commit is contained in:
Artur Wieczorek
2016-07-31 20:46:11 +02:00
parent 29c81ad515
commit 0fc246176a
1 changed files with 151 additions and 10 deletions
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161
tests/graphics/clippingbox.cpp
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@@ -31,6 +31,56 @@ static const wxSize s_dcSize(100, 120);
static const wxColour s_bgColour(*wxWHITE); // colour to draw outside clipping box
static const wxColour s_fgColour(*wxGREEN); // colour to draw inside clipping box
static bool CompareImageFuzzy(const wxImage& img1, const wxImage& img2, int posTolerance = 0)
{
// For each (x,y) pixel in the image1 we check
// if there is a pixel of the same value in the square
// area (x-d..x+d, y-d..y+d) around the pixel (x,y)
// in the image2. If not, we consider pixels
// and images as different.
if ( img1.GetWidth() != img2.GetWidth() )
return false;
if ( img1.GetHeight() != img2.GetHeight() )
return false;
const int w = img1.GetWidth();
const int h = img1.GetHeight();
for ( int y1 = 0; y1 < h; y1++ )
{
int y2min = wxMax(y1 - posTolerance, 0);
int y2max = wxMin(y1 + posTolerance, h);
for( int x1 = 0; x1 < w; x1++ )
{
int x2min = wxMax(x1 - posTolerance, 0);
int x2max = wxMin(x1 + posTolerance, w);
unsigned char r1 = img1.GetRed(x1, y1);
unsigned char g1 = img1.GetGreen(x1, y1);
unsigned char b1 = img1.GetBlue(x1, y1);
bool pix2Found = false;
for( int y2 = y2min; y2 <= y2max && !pix2Found; y2++ )
for( int x2 = x2min; x2 <= x2max; x2++ )
{
if( r1 == img2.GetRed(x2, y2) &&
g1 == img2.GetGreen(x2, y2) &&
b1 == img2.GetBlue(x2, y2))
{
pix2Found = true;
break;
}
}
if ( !pix2Found )
return false;
}
}
return true;
}
class ClippingBoxTestCaseBase : public CppUnit::TestCase
{
public:
@@ -46,9 +96,11 @@ public:
}
virtual void setUp() { wxASSERT( m_dc ); }
virtual wxDC* GetDC(wxMemoryDC* dc) = 0;
private:
void CheckBox(int x, int y, int width, int height);
void CheckBox(int x, int y, int width, int height,
const wxBitmap& bmpRef = wxNullBitmap, int posTolerance = 0);
protected:
void InitialState();
@@ -68,6 +120,7 @@ protected:
void OneLargeDevRegion();
void OneOuterDevRegion();
void OneDevRegionNegDim();
void OneDevRegionNonRect();
void OneDevRegionAndReset();
void OneDevRegionAndEmpty();
void TwoDevRegionsOverlapping();
@@ -99,7 +152,7 @@ public:
m_mdc.SelectObject(wxNullBitmap);
}
virtual void setUp()
virtual void setUp() wxOVERRIDE
{
m_mdc.DestroyClippingRegion();
wxBrush bgBrush(s_bgColour, wxBRUSHSTYLE_SOLID);
@@ -107,7 +160,13 @@ public:
m_mdc.Clear();
}
virtual void FlushDC() {}
virtual wxDC* GetDC(wxMemoryDC* dc) wxOVERRIDE
{
return dc;
}
protected:
virtual void FlushDC() wxOVERRIDE {}
private:
CPPUNIT_TEST_SUITE( ClippingBoxTestCaseDC );
@@ -128,6 +187,7 @@ private:
CPPUNIT_TEST( OneLargeDevRegion );
CPPUNIT_TEST( OneOuterDevRegion );
CPPUNIT_TEST( OneDevRegionNegDim );
CPPUNIT_TEST( OneDevRegionNonRect );
CPPUNIT_TEST( OneDevRegionAndReset);
CPPUNIT_TEST( OneDevRegionAndEmpty );
CPPUNIT_TEST( TwoDevRegionsOverlapping );
@@ -164,7 +224,7 @@ public:
delete m_gcdc;
}
virtual void setUp()
virtual void setUp() wxOVERRIDE
{
CPPUNIT_ASSERT_MESSAGE("Invalid wxGCDC", m_gcdc);
@@ -177,7 +237,17 @@ public:
m_gcdc->Clear();
}
virtual void FlushDC()
virtual wxDC* GetDC(wxMemoryDC* dc) wxOVERRIDE
{
wxGraphicsRenderer* rend = m_gcdc->GetGraphicsContext()->GetRenderer();
wxGraphicsContext* ctx = rend->CreateContext(*dc);
ctx->SetAntialiasMode(wxANTIALIAS_NONE);
ctx->DisableOffset();
return new wxGCDC(ctx);
}
protected:
virtual void FlushDC() wxOVERRIDE
{
m_gcdc->GetGraphicsContext()->Flush();
}
@@ -201,6 +271,7 @@ private:
CPPUNIT_TEST( OneLargeDevRegion );
CPPUNIT_TEST( OneOuterDevRegion );
CPPUNIT_TEST( OneDevRegionNegDim );
CPPUNIT_TEST( OneDevRegionNonRect );
CPPUNIT_TEST( OneDevRegionAndReset);
CPPUNIT_TEST( OneDevRegionAndEmpty );
CPPUNIT_TEST( TwoDevRegionsOverlapping );
@@ -260,6 +331,7 @@ private:
CPPUNIT_TEST( OneLargeDevRegion );
CPPUNIT_TEST( OneOuterDevRegion );
CPPUNIT_TEST( OneDevRegionNegDim );
CPPUNIT_TEST( OneDevRegionNonRect );
CPPUNIT_TEST( OneDevRegionAndReset);
CPPUNIT_TEST( OneDevRegionAndEmpty );
CPPUNIT_TEST( TwoDevRegionsOverlapping );
@@ -323,6 +395,7 @@ private:
CPPUNIT_TEST( OneLargeDevRegion );
CPPUNIT_TEST( OneOuterDevRegion );
CPPUNIT_TEST( OneDevRegionNegDim );
CPPUNIT_TEST( OneDevRegionNonRect );
CPPUNIT_TEST( OneDevRegionAndReset);
CPPUNIT_TEST( OneDevRegionAndEmpty );
CPPUNIT_TEST( TwoDevRegionsOverlapping );
@@ -378,6 +451,7 @@ private:
CPPUNIT_TEST( OneLargeDevRegion );
CPPUNIT_TEST( OneOuterDevRegion );
CPPUNIT_TEST( OneDevRegionNegDim );
CPPUNIT_TEST( OneDevRegionNonRect );
CPPUNIT_TEST( OneDevRegionAndReset);
CPPUNIT_TEST( OneDevRegionAndEmpty );
CPPUNIT_TEST( TwoDevRegionsOverlapping );
@@ -427,7 +501,8 @@ public:
// ===== Implementation =====
void ClippingBoxTestCaseBase::CheckBox(int x, int y, int width, int height)
void ClippingBoxTestCaseBase::CheckBox(int x, int y, int width, int height,
const wxBitmap& bmpRef, int posTolerance)
{
// Check clipping box boundaries.
int clipX, clipY, clipW, clipH;
@@ -479,18 +554,36 @@ void ClippingBoxTestCaseBase::CheckBox(int x, int y, int width, int height)
// Update wxDC contents.
FlushDC();
// Check whether diagonal corners of the clipping box
// are actually drawn at the edge of the clipping region.
#if wxUSE_IMAGE
// For some renderers it's not possible to get pixels
// value from wxDC so we would have to examine pixels
// in the underlying bitmap.
wxImage img;
img = m_bmp.ConvertToImage();
wxImage img = m_bmp.ConvertToImage();
#else
return;
#endif // wxUSE_IMAGE
// If reference bitmap is given then it has to be
// compared with current bitmap.
if ( bmpRef.IsOk() )
{
wxImage imgRef = bmpRef.ConvertToImage();
// Figures created by clipping and drawing procedures
// can be slightly different (shifted by few pixels) due
// to the different algorithms they can use so we need
// to perform a "fuzzy" comparison of the images,
// tolerating some drift of the pixels.
if ( !CompareImageFuzzy(img, imgRef, posTolerance) )
CPPUNIT_FAIL( "Invalid shape ot the clipping region" );
return;
}
// If no reference bitmap is given then rectangular
// clipping region is assumed and we check whether
// diagonal corners of the clipping box are actually
// drawn at the edge of the clipping region.
// Check area near the top-left corner
int ymin = y-1;
int xmin = x-1;
@@ -923,6 +1016,54 @@ void ClippingBoxTestCaseBase::OneDevRegionNegDim()
m_dc->DeviceToLogicalYRel(r.GetHeight()));
}
void ClippingBoxTestCaseBase::OneDevRegionNonRect()
{
// Setting one triangular clipping region in device coordinates.
const wxPoint poly[3] =
{
wxPoint(3, 5),
wxPoint(68, 18),
wxPoint(40, 72)
};
// Expected clipping box in device coordinates.
const int clipX = 4;
const int clipY = 6;
const int clipW = 64;
const int clipH = 66;
// Draw image with reference triangle.
wxBitmap bmpRef(s_dcSize);
wxMemoryDC* memDC = new wxMemoryDC(bmpRef);
wxDC* dcRef = GetDC(memDC);
dcRef->SetBackground(wxBrush(s_bgColour, wxBRUSHSTYLE_SOLID));
dcRef->Clear();
dcRef->SetBrush(wxBrush(s_fgColour, wxBRUSHSTYLE_SOLID));
dcRef->SetPen(wxPen(s_fgColour));
dcRef->DrawPolygon(WXSIZEOF(poly), poly);
delete dcRef;
m_dc->SetDeviceOrigin(10, 15);
m_dc->SetUserScale(0.5, 1.5);
m_dc->SetLogicalScale(4.0, 2.0);
m_dc->SetLogicalOrigin(-15, -20);
wxRegion r(WXSIZEOF(poly), poly);
m_dc->SetDeviceClippingRegion(r);
m_dc->SetBackground(wxBrush(s_fgColour, wxBRUSHSTYLE_SOLID));
m_dc->Clear();
// Check clipping box parameters and compare
// filled in clipping region with reference triangle.
// Triangles created by clipping and drawing procedures
// can be slightly different (shifted by few pixels) due
// to the different algorithms used for different operations
// so we need to perform a "fuzzy" comparison of the images,
// tolerating some drift of the pixels.
CheckBox(m_dc->DeviceToLogicalX(clipX),
m_dc->DeviceToLogicalY(clipY),
m_dc->DeviceToLogicalXRel(clipW),
m_dc->DeviceToLogicalYRel(clipH),
bmpRef, 1);
}
void ClippingBoxTestCaseBase::OneDevRegionAndReset()
{
// Setting one clipping region in device coordinates