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Restore support for using faster dotted pens in wxMSW

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Changes of d245dc9e1f (Fix drawing of dotted lines with wxDC in wxMSW,
2020-03-27) improved the appearance of dotted and dashed lines in wxMSW
but at the expense of significant (up to a factor of 300) slowdown.

Allow the applications for which the drawing performance is important to
explicitly request the old behaviour, with uglier, but faster, pens by
choosing to use low quality pens.

Update the graphics benchmark to allow specifying the pen quality and
verify that the performance when using it is the same as before 3.1.4.

See https://github.com/wxWidgets/wxWidgets/pull/2218

See #7097.

Closes #18875.
This commit is contained in:
Vadim Zeitlin
2021-02-07 01:27:00 +01:00
parent a5afa85c0a
commit b53f7ac904
6 changed files with 208 additions and 10 deletions
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19
include/wx/pen.h
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@@ -14,6 +14,14 @@
#include "wx/gdiobj.h"
#include "wx/peninfobase.h"
// Possible values for pen quality.
enum wxPenQuality
{
wxPEN_QUALITY_DEFAULT, // Select the appropriate quality automatically.
wxPEN_QUALITY_LOW, // Less good looking but faster.
wxPEN_QUALITY_HIGH // Best looking, at the expense of speed.
};
// ----------------------------------------------------------------------------
// wxPenInfo contains all parameters describing a wxPen
// ----------------------------------------------------------------------------
@@ -27,6 +35,7 @@ public:
: wxPenInfoBase<wxPenInfo>(colour, style)
{
m_width = width;
m_quality = wxPEN_QUALITY_DEFAULT;
}
// Setters
@@ -34,12 +43,20 @@ public:
wxPenInfo& Width(int width)
{ m_width = width; return *this; }
wxPenInfo& Quality(wxPenQuality quality)
{ m_quality = quality; return *this; }
wxPenInfo& LowQuality() { return Quality(wxPEN_QUALITY_LOW); }
wxPenInfo& HighQuality() { return Quality(wxPEN_QUALITY_HIGH); }
// Accessors
int GetWidth() const { return m_width; }
wxPenQuality GetQuality() const { return m_quality; }
private:
int m_width;
wxPenQuality m_quality;
};
@@ -57,12 +74,14 @@ public:
virtual void SetDashes(int nb_dashes, const wxDash *dash) = 0;
virtual void SetJoin(wxPenJoin join) = 0;
virtual void SetCap(wxPenCap cap) = 0;
virtual void SetQuality(wxPenQuality quality) { wxUnusedVar(quality); }
virtual wxColour GetColour() const = 0;
virtual wxBitmap *GetStipple() const = 0;
virtual wxPenStyle GetStyle() const = 0;
virtual wxPenJoin GetJoin() const = 0;
virtual wxPenCap GetCap() const = 0;
virtual wxPenQuality GetQuality() const { return wxPEN_QUALITY_DEFAULT; }
virtual int GetWidth() const = 0;
virtual int GetDashes(wxDash **ptr) const = 0;