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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)
{
assert(col.IsSolid());
//wxDC::DrawRectangle() just widens inner area if wxTRANSPARENT_PEN is used!
//bonus: wxTRANSPARENT_PEN is about 2x faster than redundantly drawing with col!
wxDCPenChanger areaPen (dc, *wxTRANSPARENT_PEN);
wxDCBrushChanger areaBrush(dc, col);
dc.DrawRectangle(rect);
}
}
//properly draw rectangle respecting high DPI (and avoiding wxPen position fuzzyness)
inline
void drawInsetRectangle(wxDC& dc, wxRect rect, int borderWidth, const wxColor& borderCol, const wxColor& innerCol)
{
if (rect.width > 0 &&
rect.height > 0)
{
assert(borderCol.IsSolid() && innerCol.IsSolid());
wxDCPenChanger rectPen (dc, *wxTRANSPARENT_PEN);
wxDCBrushChanger rectBrush(dc, borderCol);
dc.DrawRectangle(rect);
rect.Deflate(borderWidth); //attention, more wxWidgets design mistakes: behavior of wxRect::Deflate depends on object being const/non-const!!!
dc.SetBrush(innerCol);
dc.DrawRectangle(rect);
}
}
inline
void drawInsetRectangle(wxDC& dc, const wxRect& rect, int borderWidth, const wxColor& col)
{
if (rect.width > 0 &&
rect.height > 0)
{
assert(col.IsSolid());
wxDCPenChanger areaPen (dc, *wxTRANSPARENT_PEN);
wxDCBrushChanger areaBrush(dc, col);
dc.DrawRectangle(rect.GetTopLeft(), {borderWidth, rect.height});
dc.DrawRectangle(rect.GetTopLeft() + wxPoint{rect.width - borderWidth, 0}, {borderWidth, rect.height});
dc.DrawRectangle(rect.GetTopLeft(), {rect.width, borderWidth});
dc.DrawRectangle(rect.GetTopLeft() + wxPoint{0, rect.height - borderWidth}, {rect.width, borderWidth});
}
}
/* 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) */
constexpr int defaultDpi = 96;
inline
int getDPI()
{
#ifndef wxHAVE_DPI_INDEPENDENT_PIXELS
#error why is wxHAVE_DPI_INDEPENDENT_PIXELS not defined?
#endif
//GTK2 doesn't properly support high DPI: https://freefilesync.org/forum/viewtopic.php?t=6114
//=> requires general fix at wxWidgets-level
//https://github.com/wxWidgets/wxWidgets/blob/d9d05c2bb201078f5e762c42458ca2f74af5b322/include/wx/window.h#L2060
return defaultDpi; //e.g. macOS, GTK3
}
inline
int fastFromDIP(int d) //like wxWindow::FromDIP (but tied to primary monitor and buffered)
{
return numeric::intDivRound(d * getDPI() - 10 /*round values like 1.5 down => 1 pixel on 150% scale*/, defaultDpi);
}
int fastFromDIP(double d) = delete;
inline
int getDpiScalePercent()
{
return numeric::intDivRound(100 * getDPI(), defaultDpi);
}
//---------------------- 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
assert(!tmp.IsEmpty()); //"setting an empty clipping region is equivalent to DestroyClippingRegion()"
dc_.SetClippingRegion(tmp); //new clipping region is intersection of given and previously set regions
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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