Regarding the -moz-image-rect() function, I am wondering where is the best place to extract a sub image from an original image.
The existing CSS properties such as border-image extract sub images at the last moment right before calling nsLayoutUtils::DrawImage() and thus each time a frame is trigger to be painted, temporary surfaces are created and disposed to paint the sub image (bug 444658). This is also the approach I used for the work-in-progress patch that I attached to bug 113577. An alternative is to extract a sub image as soon as the original image is loaded and store it somewhere (imgSubImageRequest?) as long as it is being referenced. This way, extraction is performed only once for a single sub image, and also the extracted sub image can be cached by imgLoader. A drawback is that both the original image and the sub images coexist in the memory for a while. Thank you very much for any feedback. Ryo _______________________________________________ dev-tech-layout mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-layout
