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16 Apr 2024 : Day 218 #
I've been continuing my patch audit today. It remains a bit of a lengthy and laborious process, but I have at least managed to get through them all.

Until now I've been keeping track of patches that have been applied, patches that aren't needed — either because changes have become redundant or because the code has changed so much that they're just no longer applicable — and patches that haven't yet been applied.

As I worked through today I found a new category to log: patches that haven't been applied but really should be. For example there are patches to ensure libcontentaction is used for handling URLs, or patches for managing extensions better on mobile. These are changes that won't necessarily have an immediately obvious effect on whether or not the browser runs, but will have functionality or efficiency impacts that need to be included.

The list of all such patches is longer than I was expecting:

0056, 0057, 0058, 0059, 0060, 0061, 0062, 0063, 0067, 0068, 0069, 0074, 0077, 0078, 0079, 0080, 0081, 0086.

You might well ask, if I know for sure that these should be applied, why didn't I just apply them? That's because I don't want to muddy the waters with them while I focus on fixing the offscreen render pipeline. If I applied these patches now, not only would it make debugging harder, it would also make the partitioning of code changes into clean patches harder as well. What I am sure about, however, is that none of these are affecting the render pipeline problem.

On top of these the following patches haven't been applied, but potentially should be. I say potentially because these are patches which either probably should be applied but I've not had time to properly decide yet, or where it's possible the reason for the patch was fixed upstream, but it's not entirely clear yet.

For example this includes patches for integrating with FFmpeg version 5.0 and above, patches to fix bugs or fixes for memory leaks. When I checked these they definitely hadn't yet been applied, but maybe they can safely be skipped. I should go through all of these more carefully at some point. Here's the list:

0008, 0012, 0014, 0041, 0042, 0043, 0044, 0045, 0046, 0049, 0050, 0051, 0052, 0064, 0066, 0073, 0076, 0082, 0083, 0084, 0085, 0087, 0089, 0090, 0091, 0094, 0095, 0096, 0097, 0099.

Then there are the patches that are not needed. I didn't find any more of these, so the list remains the same as yesterday with the following:

0004, 0005, 0013, 0035.

Finally the patches that have already been applied:

0001, 0002, 0003, 0006, 0007, 0009, 0010, 0011, 0015, 0016, 0017, 0018, 0019, 0020, 0021, 0022, 0023, 0024, 0025, 0026, 0027, 0028, 0029, 0030, 0031, 0032, 0033, 0034, 0036, 0037, 0038, 0039, 0040, 0047, 0048, 0053, 0054, 0055, 0065, 0070, 0071, 0072, 0075, 0088, 0092, 0093, 0099.

That's 47 patches in total; just under half. Plus the four that won't get applied at all sums to 51 patches dealt with, leaving 48 that still need dealing with; just under half.

Of those patches that have been applied, the following are the ones that hadn't been applied but looked potentially relevant to the render pipeline issue I'm tryig to fix. So I went ahead and applied all of these just in case:

0053, 0054, 0055, 0065, 0075.

My suspicion is that none of these will be important enough to fix the issue, but all contributions are helpful. The next step is to build myself some new packages, install them and see where we are.

Then, tomorrow, I can finally move on to the task that was discussed at the community meeting last Thursday. I'm going to start testing the render status at points in between DeclarativeWebContainer::clearWindowSurface() and CompositorOGL::EndFrame(). This will help narrow down where the working render turns into a broken render. That'll leave me in a much better position to focus on why.

I'm just starting the build now.

If you'd like to read any of my other gecko diary entries, they're all available on my Gecko-dev Diary page.


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