Quote:
Originally Posted by ondabeach
Feel free to send any code snippets you think might help  |
Hi Steve,
Take a look at the off-screen bitmap manipulation in Freda (you can find the source code by following the link in the manual
http://www.turnip.demon.co.uk/jim/fr...nual/index.htm). The important class to look at is BitmapCache - and the way that the GetBitmapForPage method uses it. What's going on is that if a bitmap is needed for a given page number (plus 'render' attributes like font face/size and page geometry) then that bitmap is drawn using drawstring/drawimage, *unless it's already been drawn and cached* ... in which case the bitmap is copied from the cache. There may be some ideas you can reuse there. Anyhow, I'm in the middle of re-writing all this code to remove various bits of ad-hoccery and improve the general level of abstraction - so the next version might be more re-usable.
One word of warning: I have found out the hard way that in .NetCF (depending on which Bitmap constructor signature you use) you will get either:
Device Independent Bitmap: you can create a large number of these, but they render very slowly; or:
Device Dependent Bitmap: these render acceptably fast, but creating more than ten of these will exhaust the resources in your GDI DLL (you'll get an OOM exception).
I found that 'ten' limit by trial and error - and it varies from phone to phone (and ROM to ROM).
Happy Hacking!
Jim