Max Vlasov schrieb:
- There are some functions, for example region-related in windows that nevertheless process full job even if the area the developer is drawing is not included in the window update region - There are internal off-screen manipulation so the developer himself have to do the job of avoiding extra processing so needs to know what the update region is .
I use to restrict expensive painting to the ClipRect. The entire painting has to be organized into kind of "objects", which reside in distinct parts of the entire canvas - just like controls reside in distinct parts of the client area. Before retrieving the entire painting information, I get the object's rectangle and check whether it intersects with the ClipRect. If not, painting is skipped for that object.
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