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Optimize drawing cross hair

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We have an optimized function to draw horizontal/vertical lines on DC with a non-rotated coordinate system so we can use it for drawing cross hair.
This commit is contained in:
Artur Wieczorek 2019-10-17 17:31:31 +02:00
parent bae8bb4c45
commit 147fc16f1e
1 changed files with 26 additions and 2 deletions
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24
src/msw/dc.cpp
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@ -810,8 +810,32 @@ void wxMSWDCImpl::DoCrossHair(wxCoord x, wxCoord y)
// of complex transformation (is e.g. rotated).
::InflateRect(&rect, 1, 1);
// We have optimized function to draw physical vertical or horizontal lines
// with solid color and square ends so it can be used to draw a cross hair
// for:
// - Solid lines with pen width > 0 because it doesn't support drawing
// non-scaled 1-pixel wide lines when pen width is 0. Shape of the lines
// ends doesn't matter because non-square line ends are drawn outside
// the view and visible line ends are always square.
// - DC which coordinate system is not rotated (graphics mode
// of the DC != GM_ADVANCED).
if ( ::GetGraphicsMode(GetHdc()) != GM_ADVANCED && // ensure DC is not rotated
m_pen.IsNonTransparent() && // this calls IsOk() too
m_pen.GetStyle() == wxPENSTYLE_SOLID &&
m_pen.GetWidth() > 0
)
{
COLORREF color = wxColourToRGB(m_pen.GetColour());
wxDrawHVLine(GetHdc(), XLOG2DEV(rect.left), YLOG2DEV(y), XLOG2DEV(rect.right), YLOG2DEV(y),
color, m_pen.GetWidth());
wxDrawHVLine(GetHdc(), XLOG2DEV(x), YLOG2DEV(rect.top), XLOG2DEV(x), YLOG2DEV(rect.bottom),
color, m_pen.GetWidth());
}
else
{
wxDrawLine(GetHdc(), XLOG2DEV(rect.left), YLOG2DEV(y), XLOG2DEV(rect.right), YLOG2DEV(y));
wxDrawLine(GetHdc(), XLOG2DEV(x), YLOG2DEV(rect.top), XLOG2DEV(x), YLOG2DEV(rect.bottom));
}
CalcBoundingBox(rect.left, rect.top);
CalcBoundingBox(rect.right, rect.bottom);