[GRASS-dev] [GRASS GIS] #1719: GRASS 7 Monitor command line support

[GRASS GIS]

#1719: GRASS 7 Monitor command line support
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 Reporter:  annalisapg   |       Owner:  grass-dev@…              
     Type:  enhancement  |      Status:  new                      
 Priority:  normal       |   Milestone:  7.0.0                    
Component:  wxGUI        |     Version:  svn-trunk                
 Keywords:  d.mon        |    Platform:  Unspecified              
      Cpu:  Unspecified  |  
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Comment(by cmbarton):

 Replying to [comment:17 wenzeslaus]:
 > Replying to [comment:16 glynn]:
 > >
 > > In theory, the fastest solution should be to use the cairo driver with
 output to X Pixmaps. The d.* modules generate output in video memory, and
 may be hardware accelerated. Compositing occurs entirely in video memory,
 and may be hardware accelerated. The main unknowns are how hard wxWidgets
 makes this, and whether something similar can be achieved on other
 platforms.
 >
 > In wxWidgets there is wxBitmap ([http://wxpython.org/docs/api/wx.Bitmap-
 class.html wxPython], [http://docs.wxwidgets.org/2.8/wx_wxbitmap.html
 wxWidgets]).
 > {{{
 > This class encapsulates the concept of a platform-dependent bitmap,
 either monochrome or colour or colour with alpha channel support.
 > }}}
 >
 > This wxBitmap can be directly drawn on some wx widget/window. This
 operation is fast.
 >
 > Can be wxBitmap used for what you are talking about? It is the same as X
 Pixmap on linux?
 >
 > But how would be this bitmap/pixmap transfered from d.* module to wxGUI
 application?


 We already use wx.Bitmap

 The PNM file generated by g.pnmcomp is read by wx.Image. A wx.Bitmap is
 created from the wx.Image object and is rendered to the DC canvas. This
 part is fast.

 AFAICT, the slowest part of the process is the d.* rendering.

 For any changes to the rendering, keep in mind that other modules use this
 rendering engine to. So any fix needs to work in all modules that go from
 d.* modules to screen.

 Michael

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1719#comment:19>
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