wxImage & DIB suggestions Topic is solved

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spectrum
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wxImage & DIB suggestions

Post by spectrum » Thu Jul 26, 2007 8:30 am

hi all,
i was wandering if my approach of displaying a DIB is correct.

I have a DIB in memory, generated from a commerical graphic library.

Using wxWidget 2.8 im using the following procedure to display it, and mantain the application win/mac portable.

1) i mirror the Y axis (my own function) of the bitmap in memory (DIB are stored with lines reversed).
2) sometime the DIB is 8bpp, so when necessary, i convert 8bpp to 24bpp (my own function).
3) i give the 24bpp buffer to the wxImage constructor.
4) i create a wxBitmap(wxImage)
5) i use dc.DrawBitmap

This procedure works fine, but i'm not sure if i can avoid some steps, if i'm missing something to make it easier.


Many thanks, Angelo
spectrum

Trikko
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Re: wxImage & DIB suggestions

Post by Trikko » Thu Jul 26, 2007 10:04 am

spectrum wrote:hi all,
i was wandering if my approach of displaying a DIB is correct.

I have a DIB in memory, generated from a commerical graphic library.

Using wxWidget 2.8 im using the following procedure to display it, and mantain the application win/mac portable.

1) i mirror the Y axis (my own function) of the bitmap in memory (DIB are stored with lines reversed).
2) sometime the DIB is 8bpp, so when necessary, i convert 8bpp to 24bpp (my own function).
3) i give the 24bpp buffer to the wxImage constructor.
4) i create a wxBitmap(wxImage)
5) i use dc.DrawBitmap

This procedure works fine, but i'm not sure if i can avoid some steps, if i'm missing something to make it easier.


Many thanks, Angelo
Do you call these steps many times?
Are dib dimensions fixed?

spectrum
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Post by spectrum » Thu Jul 26, 2007 10:10 am

the application display a particular XY graph. For now i've fixed it to 640x480, and i recall the procedure everytime i zoom or i move the diagram.
spectrum

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Post by Trikko » Thu Jul 26, 2007 10:34 am

spectrum wrote:the application display a particular XY graph. For now i've fixed it to 640x480, and i recall the procedure everytime i zoom or i move the diagram.
Maybe you can speedup a bit using a single wxImage everytime, and updating its buffer copying memory from dib to wxImage buffer (using memory functions like memcpy).

I know there're some undocumented classes that you can use to access to raw bitmap data maybe. In this case you can use wxBitmap only (without wxImage)

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Post by upCASE » Thu Jul 26, 2007 10:42 am

Trikko wrote:I know there're some undocumented classes that you can use to access to raw bitmap data maybe. In this case you can use wxBitmap only (without wxImage)
There's a file called rawbmp.h that contains just that. It contains some example code as well. Can be pretty handy.
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spectrum
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Post by spectrum » Thu Jul 26, 2007 12:13 pm

many thanks
spectrum

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