A general approach for using wxBitmap with wxImage Topic is solved

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A general approach for using wxBitmap with wxImage

Post by bluesnowball18 » Sat Jun 19, 2021 11:11 pm

I would like to clarify one thing about the usage of wxImage.

The latest trunk documentation says that
By splitting the responsibilities between wxImage/wxBitmap like this then it's easier to use generic code shared by all platforms and image types for generic operations and platform specific code where performance or compatibility is needed.
Is this a good idea to store only wxImage and draw a bitmap every time the image is changed? Taking into consideration the high memory usage of wxImage, what are the drawbacks of using wxBitmap for both storing and editing pixel data and wxImage only for handling different file formats?

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Re: A general approach for using wxBitmap with wxImage

Post by doublemax » Sun Jun 20, 2021 9:32 am

The internal byte structure of wxBitmap is platform dependent, so it's harder to edit.
Only wxBitmaps can be drawn onto a wxDC, so every wxImage needs to be converted before drawing.
Every conversion from wxImage and wxBitmap is slow, so if performance is an issue, these should be avoided.

What's best to use depends on your specific requirements.
Use the source, Luke!

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