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Add unit test for ellipse boundary pixels

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Add test verifying that the ellipse is drawn in the expected way, even
if this is not really intuitive because it can overflow its bounding
rectangle.

Closes #24620.
This commit is contained in:
Bill Su
2024-08-11 22:19:12 +02:00
committed by Vadim Zeitlin
parent fafcab97ce
commit 78bc9f24f3
1 changed files with 113 additions and 0 deletions
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tests/graphics/bitmap.cpp
+113
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@@ -170,6 +170,7 @@ TEST_CASE("BitmapTestCase::ToImage", "[bitmap][image][convertto]")
}
}
// rectangle transparent pen test
for ( int size = 4 ; size != 0 ; --size )
{
INFO("Red square size: " << size)
@@ -215,6 +216,118 @@ TEST_CASE("BitmapTestCase::ToImage", "[bitmap][image][convertto]")
}
}
}
/* ellipse boundary test: on wxMSW, ellipse goes outside
rect on right and bottom */
{
wxBitmap bmp2 = bmp;
// verify bmp starts yellow
{
wxNativePixelData dataBmp(bmp2);
wxNativePixelData::Iterator rowStartBmp(dataBmp);
for ( int y = 0; y < bmp2.GetHeight(); ++y )
{
wxNativePixelData::Iterator iBmp = rowStartBmp;
for ( int x = 0; x < bmp2.GetWidth(); ++x, ++iBmp )
{
wxColour bmpc(iBmp.Red(), iBmp.Green(), iBmp.Blue());
CHECK_EQUAL_COLOUR_RGB(bmpc, (*wxYELLOW));
}
rowStartBmp.OffsetY(dataBmp, 1);
}
}
// change rectangle to red
wxRect rect(wxPoint(3, 3), wxSize(10, 5));
{
wxMemoryDC dc(bmp2);
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush(*wxRED_BRUSH);
dc.DrawRectangle(rect);
}
// verify bitmap is still yellow, except rectangle is red
{
wxNativePixelData dataBmp(bmp2);
wxNativePixelData::Iterator rowStartBmp(dataBmp);
for ( int y = 0; y < bmp2.GetHeight(); ++y )
{
wxNativePixelData::Iterator iBmp = rowStartBmp;
for ( int x = 0; x < bmp2.GetWidth(); ++x, ++iBmp )
{
wxColour bmpc(iBmp.Red(), iBmp.Green(), iBmp.Blue());
CHECK_EQUAL_COLOUR_RGB(bmpc, (rect.Contains(x, y) ? *wxRED : *wxYELLOW));
}
rowStartBmp.OffsetY(dataBmp, 1);
}
}
// draw ellipse with rectangle bottomright moved in 1 (diagonal) pixel
{
wxMemoryDC dc(bmp2);
dc.SetPen(*wxRED_PEN);
dc.SetBrush(*wxTRANSPARENT_BRUSH);
wxRect rect2(rect.GetTopLeft(), wxSize(rect.GetWidth() - 1, rect.GetHeight() - 1));
dc.DrawEllipse(rect2);
}
// verify bitmap is still yellow, except rectangle is red
{
wxNativePixelData dataBmp(bmp2);
wxNativePixelData::Iterator rowStartBmp(dataBmp);
for ( int y = 0; y < bmp2.GetHeight(); ++y )
{
wxNativePixelData::Iterator iBmp = rowStartBmp;
for ( int x = 0; x < bmp2.GetWidth(); ++x, ++iBmp )
{
wxColour bmpc(iBmp.Red(), iBmp.Green(), iBmp.Blue());
CHECK_EQUAL_COLOUR_RGB(bmpc, (rect.Contains(x, y) ? *wxRED : *wxYELLOW));
}
rowStartBmp.OffsetY(dataBmp, 1);
}
}
// draw ellipse with full rectangle
{
wxMemoryDC dc(bmp2);
dc.SetPen(*wxRED_PEN);
dc.SetBrush(*wxTRANSPARENT_BRUSH);
dc.DrawEllipse(rect);
}
// verify that ellipse exceeded rect on bottom and right
{
bool pastBottom = false;
bool pastRight = false;
wxNativePixelData dataBmp(bmp2);
wxNativePixelData::Iterator rowStartBmp(dataBmp);
for ( int y = 0; y < bmp2.GetHeight(); ++y )
{
wxNativePixelData::Iterator iBmp = rowStartBmp;
for ( int x = 0; x < bmp2.GetWidth(); ++x, ++iBmp )
{
wxColour bmpc(iBmp.Red(), iBmp.Green(), iBmp.Blue());
if (bmpc != (rect.Contains(x, y) ? *wxRED : *wxYELLOW))
{
INFO("x,y: " << x << ", " << y);
if (y == rect.GetBottom() + 1)
{
pastBottom = true;
}
if (x == rect.GetRight() + 1)
{
pastRight = true;
}
}
CHECK((bmpc == (rect.Contains(x, y) ? *wxRED : *wxYELLOW) ||
y == rect.GetBottom() + 1 ||
x == rect.GetRight() + 1));
}
rowStartBmp.OffsetY(dataBmp, 1);
}
CHECK((pastBottom && pastRight));
}
}
}
SECTION("RGB bitmap with mask")