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• configure : link to libatomic when it's present

  19 janvier 2022, par Anton Khirnov

  configure : link to libatomic when it's present
  C11 atomics in some configurations (e.g. 64bit operations on ppc64 with
  
  GCC) require linking to libatomic.
  Fixes #9275
  

  • [DH] configure

• configure : add hls demuxer link dependencies

  19 octobre 2021, par Limin Wang

  configure : add hls demuxer link dependencies
  Fixes building with —disable-everything —enable-demuxer=hls
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] configure

• How to select a rectangle of the screen to capture by dragging mouse on transparent background with wxPython ?

  4 août 2019, par makrottk

  I’m working on building an application to capture screen with ffmpeg and would like to determine the portion of the screen to capture by dragging the mouse, drawing a rectangle and passing the arguments to the ffmpeg call.

  I’m using wxPython to build a simple GUI for the application. I’ve gotten to the point where I can draw the rectangle and get the coordinates that I want : offset and size of the selected area.

  import wx
  
  
  
  global selectionOffset, selectionSize
  
  
  
  selectionOffset = ""
  
  selectionSize = ""
  
  
  
  class SelectableFrame(wx.Frame):
  
  
  
      c1 = None
  
      c2 = None
  
  
  
      def __init__(self, parent=None, id=wx.ID_ANY, title=""):
  
          wx.Frame.__init__(self, parent, id, title, size=wx.DisplaySize(), style=wx.TRANSPARENT_WINDOW)
  
  
  
          self.Bind(wx.EVT_MOTION, self.OnMouseMove)
  
          self.Bind(wx.EVT_LEFT_DOWN, self.OnMouseDown)
  
          self.Bind(wx.EVT_LEFT_UP, self.OnMouseUp)
  
          self.Bind(wx.EVT_PAINT, self.OnPaint)
  
  
  
          self.SetCursor(wx.Cursor(wx.CURSOR_CROSS))
  
  
  
      def OnMouseMove(self, event):
  
          if event.Dragging() and event.LeftIsDown():
  
              self.c2 = event.GetPosition()
  
              self.Refresh()
  
  
  
      def OnMouseDown(self, event):
  
          self.c1 = event.GetPosition()
  
  
  
      def OnMouseUp(self, event):
  
          self.SetCursor(wx.Cursor(wx.CURSOR_ARROW))
  
          self.Destroy()
  
  
  
      def OnPaint(self, event):
  
          global selectionOffset, selectionSize
  
          if self.c1 is None or self.c2 is None: return
  
  
  
          dc = wx.PaintDC(self)
  
          dc.SetPen(wx.Pen('red', 1))
  
          dc.SetBrush(wx.Brush(wx.Colour(0, 0, 0), wx.TRANSPARENT))
  
  
  
          dc.DrawRectangle(self.c1.x, self.c1.y, self.c2.x - self.c1.x, self.c2.y - self.c1.y)
  
          selectionOffset = str(self.c1.x) + "x" + str(self.c1.y)
  
          selectionSize = str(abs(self.c2.x - self.c1.x)) + "x" + str(abs(self.c2.y - self.c1.y))
  
      def PrintPosition(self, pos):
  
          return str(pos.x) + "x" + str(pos.y)
  
  
  
  
  
  class MyApp(wx.App):
  
  
  
      def OnInit(self):
  
          frame = SelectableFrame()
  
          frame.Show(True)
  
          self.SetTopWindow(frame)
  
  
  
          return True
  
  
  
  
  
  app = MyApp(redirect=False)
  
  app.MainLoop()
  
  print("offset: " + selectionOffset + ". Screen selection size: " + selectionSize)

  The problem is I can’t get the "background" to be transparent so I can see which portion of the screen I’m really grabbing. How can I do that with wxPython ? If there’s an easier way with another GUI tool or python module I’m open to suggestions. Thanks !