What is the fastest way to draw a TFPMemoryImage on a TCanvas in the LCL? I've looked for some examples but sofar I just couldn't find any.

TCanvas is a descendent from an fcl-image one, but I couldn't get it to work for some strange reason.

Any ideas?

Regards, Darius

Does it have to be TFPMemoryImage?

You can use TLazCanvas+TLazIntfImage+RawImage, like this wiki example demonstrates:

http://wiki.lazarus.freepascal.org/Developing_with_Graphics#Using_the_non-native_StretchDraw_from_LazCanvas

Unfortunately yes. I use a TFPMemoryImage descendant as internal datastructure in my application. Alternatively I could use OpenGL context to draw the images (thumbnails), but I would prefer TCanvas if possible. For now I'm just copying the data over to a bitmap, but this is of course far from ideal.

Gr. Darius

Felipe Monteiro de Carvalho wrote

Does it have to be TFPMemoryImage?

You can use TLazCanvas+TLazIntfImage+RawImage, like this wiki example

demonstrates:

http://wiki.lazarus.freepascal.org/Developing_with_Graphics#Using_the_non-native_StretchDraw_from_LazCanvas [1]

Links:
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http://wiki.lazarus.freepascal.org/Developing_with_Graphics#Using_the_non-native_StretchDraw_from_LazCanvas -------------- next part --------------
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2012/2/4 :

How are you doing the copy of the data to a TBitmap? This step is necessary anyway, but you cannot do it reliably in all supported platform without TLazIntfImage.

TLazIntfImage+RawImage does the same job as TFPMemoryImage, they even come from the same base class:

TLazIntfImage = class(TFPCustomImage)

So I bet you could use that internally instead of TFPMemoryImage. And then you get better LCL integration.