DynamicRangeProcessorPanelCommon.cpp

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  DynamicRangeProcessorPanelCommon.cpp
 
  Matthieu Hodgkinson
 
**********************************************************************/
#include "DynamicRangeProcessorPanelCommon.h"
#include "wxPanelWrapper.h"
#include <wx/dcclient.h>
#include <wx/pen.h>
 
namespace DynamicRangeProcessorPanel
{
std::unique_ptr<wxGraphicsContext> MakeGraphicsContext(const wxPaintDC& dc)
{
   auto gc = wxGraphicsContext::Create(dc);
   gc->SetAntialiasMode(wxANTIALIAS_DEFAULT);
   gc->SetInterpolationQuality(wxINTERPOLATION_BEST);
   return std::unique_ptr<wxGraphicsContext>(gc);
}
 
wxColor GetColorMix(const wxColor& a, const wxColor& b, double aWeight)
{
   return wxColor(
      a.Red() * aWeight + b.Red() * (1 - aWeight),
      a.Green() * aWeight + b.Green() * (1 - aWeight),
      a.Blue() * aWeight + b.Blue() * (1 - aWeight),
      a.Alpha() * aWeight + b.Alpha() * (1 - aWeight));
}
 
float GetGraphDbRange(int height)
{
   const auto factor = std::max(1.f, 1.f * height / graphMinHeight);
   return factor * graphMinRangeDb;
}
 
wxGraphicsBrush GetGraphBackgroundBrush(wxGraphicsContext& gc, int height)
{
   // It looks like we're not going to use a gradient for the background after
   // all, but keep the way we had it available for a while, in case we change
   // our mind. (Whoever still sees this code in this state in the future please
   // feel free to clean up.)
   constexpr auto useGradient = false;
   return useGradient ? gc.CreateLinearGradientBrush(
                           0, 0, 0, height, backgroundColor,
                           GetColorMix(backgroundColor, *wxWHITE, 0.75)) :
                        gc.CreateBrush(backgroundColor);
}
 
wxRect GetPanelRect(const wxPanelWrapper& panel)
{
#ifndef __WXMAC__
   return panel.GetClientRect();
#else
   auto rect = panel.GetClientRect();
   rect.SetX(rect.GetX() + 1);
   rect.SetY(rect.GetY() + 1);
   rect.SetWidth(rect.GetWidth() - 1);
   rect.SetHeight(rect.GetHeight() - 1);
   return rect;
#endif
}
 
} // namespace DynamicRangeProcessorPanel