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Slow image drawing on big images [message #13831]

Tue, 29 January 2008 14:31

mdelfede is currently offline

mdelfede
Messages: 1307
Registered: September 2007

Ultimate Contributor

I'm making a fax viewer application, that must retrieve a .tiff multipage file from a fax server and display it on screen.
So, I found following problems :

1 - lack (IMHO...) of support of multi-image tiffs
2 - *very* slow speed of image drawing using ImageCtrl

I guess point 1 is easy to solve, just adding few lines of code both in tif library and in Image class.
Point 2... I don't know how to handle it, so I have some questions.
I've seen that drawing is done in

void Image::Data::Paint(Draw& w, int x, int y, const Rect& src, Color c)

in ImageX11.cpp. As I can understand, the image is converted to an X11 one on the fly just before drawing... It would maybe make sense to keep (optionally) the X11 converted image buffered so on next paints it goes faster.
As is it now when I change control size (dragging main window) the pic takes some thenths of second to redraw, so real time pan/zoom is impossible.

Any smart solution ?

Ciao

Max

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[Message index]

		Slow image drawing on big images By: mdelfede on Tue, 29 January 2008 14:31
		Re: Slow image drawing on big images By: mirek on Tue, 29 January 2008 14:35
		Re: Slow image drawing on big images By: mdelfede on Tue, 29 January 2008 15:03
		Re: Slow image drawing on big images By: mirek on Tue, 29 January 2008 19:38
		Re: Slow image drawing on big images By: mirek on Tue, 29 January 2008 20:04
		Re: Slow image drawing on big images By: mdelfede on Tue, 29 January 2008 22:27
		Re: Slow image drawing on big images By: mirek on Tue, 29 January 2008 22:30
		Re: Slow image drawing on big images By: mdelfede on Tue, 29 January 2008 23:56
		Re: Slow image drawing on big images By: mirek on Wed, 30 January 2008 09:01
		Re: Slow image drawing on big images By: mdelfede on Wed, 30 January 2008 10:33

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