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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef DC_H_4987123956832143243214
#define DC_H_4987123956832143243214
#include <unordered_map>
#include <zen/optional.h>
#include <wx/dcbuffer.h> //for macro: wxALWAYS_NATIVE_DOUBLE_BUFFER
namespace zen
{
/*
1. wxDCClipper does *not* stack: another fix for yet another poor wxWidgets implementation
class RecursiveDcClipper
{
RecursiveDcClipper(wxDC& dc, const wxRect& r) : dc_(dc)
};
------------------------------------------------------------------------------------------------
2. wxAutoBufferedPaintDC skips one pixel on left side when RTL layout is active: a fix for a poor wxWidgets implementation
class BufferedPaintDC
{
BufferedPaintDC(wxWindow& wnd, std::unique_ptr<wxBitmap>& buffer);
};
*/
//---------------------- implementation ------------------------
class RecursiveDcClipper
{
public:
RecursiveDcClipper(wxDC& dc, const wxRect& r) : dc_(dc)
{
auto it = refDcToAreaMap().find(&dc);
if (it != refDcToAreaMap().end())
{
oldRect = it->second;
wxRect tmp = r;
tmp.Intersect(*oldRect); //better safe than sorry
dc_.SetClippingRegion(tmp); //
it->second = tmp;
}
else
{
dc_.SetClippingRegion(r);
refDcToAreaMap().emplace(&dc_, r);
}
}
~RecursiveDcClipper()
{
dc_.DestroyClippingRegion();
if (oldRect)
{
dc_.SetClippingRegion(*oldRect);
refDcToAreaMap()[&dc_] = *oldRect;
}
else
refDcToAreaMap().erase(&dc_);
}
private:
//associate "active" clipping area with each DC
static std::unordered_map<wxDC*, wxRect>& refDcToAreaMap() { static std::unordered_map<wxDC*, wxRect> clippingAreas; return clippingAreas; }
Opt<wxRect> oldRect;
wxDC& dc_;
};
#ifndef wxALWAYS_NATIVE_DOUBLE_BUFFER
#error we need this one!
#endif
#if wxALWAYS_NATIVE_DOUBLE_BUFFER
struct BufferedPaintDC : public wxPaintDC { BufferedPaintDC(wxWindow& wnd, Opt<wxBitmap>& buffer) : wxPaintDC(&wnd) {} };
#else
class BufferedPaintDC : public wxMemoryDC
{
public:
BufferedPaintDC(wxWindow& wnd, Opt<wxBitmap>& buffer) : buffer_(buffer), paintDc(&wnd)
{
const wxSize clientSize = wnd.GetClientSize();
if (!buffer_ || clientSize != wxSize(buffer->GetWidth(), buffer->GetHeight()))
buffer = wxBitmap(clientSize.GetWidth(), clientSize.GetHeight());
SelectObject(*buffer);
if (paintDc.IsOk() && paintDc.GetLayoutDirection() == wxLayout_RightToLeft)
SetLayoutDirection(wxLayout_RightToLeft);
}
~BufferedPaintDC()
{
if (GetLayoutDirection() == wxLayout_RightToLeft)
{
paintDc.SetLayoutDirection(wxLayout_LeftToRight); //workaround bug in wxDC::Blit()
SetLayoutDirection(wxLayout_LeftToRight); //
}
const wxPoint origin = GetDeviceOrigin();
paintDc.Blit(0, 0, buffer_->GetWidth(), buffer_->GetHeight(), this, -origin.x, -origin.y);
}
private:
Opt<wxBitmap>& buffer_;
wxPaintDC paintDc;
};
#endif
}
#endif //DC_H_4987123956832143243214
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