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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef DC_H_4987123956832143243214
#define DC_H_4987123956832143243214
#include <unordered_map>
#include <optional>
#include <zen/basic_math.h>
#include <wx/dcbuffer.h> //for macro: wxALWAYS_NATIVE_DOUBLE_BUFFER
#include <wx/dcscreen.h>
#include <gtk/gtk.h>
namespace zen
{
/* 1. wxDCClipper does *not* stack: another fix for yet another poor wxWidgets implementation
class RecursiveDcClipper
{
RecursiveDcClipper(wxDC& dc, const wxRect& r)
};
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)
}; */
inline
void clearArea(wxDC& dc, const wxRect& rect, const wxColor& col)
{
if (rect.width > 0 && //clearArea() is surprisingly expensive
rect.height > 0)
{
wxDCPenChanger dummy (dc, col);
wxDCBrushChanger dummy2(dc, col);
dc.DrawRectangle(rect);
}
}
/* Standard DPI:
Windows/Ubuntu: 96 x 96
macOS: wxWidgets uses DIP (note: wxScreenDC().GetPPI() returns 72 x 72 which is a lie; looks like 96 x 96) */
inline
int fastFromDIP(int d) //like wxWindow::FromDIP (but tied to primary monitor and buffered)
{
#ifdef wxHAVE_DPI_INDEPENDENT_PIXELS //pulled from wx/window.h: https://github.com/wxWidgets/wxWidgets/blob/master/include/wx/window.h#L2029
return d; //e.g. macOS, GTK3
#else //https://github.com/wxWidgets/wxWidgets/blob/master/src/common/wincmn.cpp#L2865
static_assert(GTK_MAJOR_VERSION == 2);
//GTK2 doesn't properly support high DPI: https://freefilesync.org/forum/viewtopic.php?t=6114
//=> requires general fix at wxWidgets-level
assert(wxTheApp); //only call after wxWidgets was initalized!
static const int dpiY = wxScreenDC().GetPPI().y; //perf: buffering for calls to ::GetDeviceCaps() needed!?
const int defaultDpi = 96;
return 1.0 * d * dpiY / defaultDpi + 0.49 /*round values like 1.5 down, e.g. 1 pixel on 150% scale*/;
#endif
}
//---------------------- implementation ------------------------
class RecursiveDcClipper
{
public:
RecursiveDcClipper(wxDC& dc, const wxRect& r) : dc_(dc)
{
if (auto it = clippingAreas.find(&dc);
it != clippingAreas.end())
{
oldRect_ = it->second;
wxRect tmp = r;
tmp.Intersect(*oldRect_); //better safe than sorry
dc_.SetClippingRegion(tmp); //
it->second = tmp;
}
else
{
dc_.SetClippingRegion(r);
clippingAreas.emplace(&dc_, r);
}
}
~RecursiveDcClipper()
{
dc_.DestroyClippingRegion();
if (oldRect_)
{
dc_.SetClippingRegion(*oldRect_);
clippingAreas[&dc_] = *oldRect_;
}
else
clippingAreas.erase(&dc_);
}
private:
RecursiveDcClipper (const RecursiveDcClipper&) = delete;
RecursiveDcClipper& operator=(const RecursiveDcClipper&) = delete;
//associate "active" clipping area with each DC
inline static std::unordered_map<wxDC*, wxRect> clippingAreas;
std::optional<wxRect> oldRect_;
wxDC& dc_;
};
#ifndef wxALWAYS_NATIVE_DOUBLE_BUFFER
#error we need this one!
#endif
//CAVEAT: wxPaintDC on wxGTK/wxMAC does not implement SetLayoutDirection()!!! => GetLayoutDirection() == wxLayout_Default
#if wxALWAYS_NATIVE_DOUBLE_BUFFER
struct BufferedPaintDC : public wxPaintDC { BufferedPaintDC(wxWindow& wnd, std::optional<wxBitmap>& buffer) : wxPaintDC(&wnd) {} };
#else
class BufferedPaintDC : public wxMemoryDC
{
public:
BufferedPaintDC(wxWindow& wnd, std::optional<wxBitmap>& buffer) : buffer_(buffer), paintDc_(&wnd)
{
const wxSize clientSize = wnd.GetClientSize();
if (clientSize.GetWidth() > 0 && clientSize.GetHeight() > 0) //wxBitmap asserts this!! width may be 0; test case "Grid::CornerWin": compare both sides, then change config
{
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);
}
else
buffer = {};
}
~BufferedPaintDC()
{
if (buffer_)
{
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:
BufferedPaintDC (const BufferedPaintDC&) = delete;
BufferedPaintDC& operator=(const BufferedPaintDC&) = delete;
std::optional<wxBitmap>& buffer_;
wxPaintDC paintDc_;
};
#endif
}
#endif //DC_H_4987123956832143243214
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