Port "improve _gdImageFillTiled() internal function" #17356
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This improvement was done for libgd 2.1.0[1], and the erroneous calculation has been fixed as of libgd 2.2.0[2]. While we're at it we also add the overflow checks of external libgd; these are not really necessary, since `.sx * .sy` overflow was already prevented when the image has been created, and since we're using `safe_emalloc()` the `struct seg` overflow is also prevented. It should be noted that `overflow2()` prevents `int` overflow, while `safe_emalloc()` prevents `size_t` overflow, so the former is more restrictive. For parity with external libgd, this still appears to be a good thing. [1] <libgd/libgd@86a5deb> [2] <libgd/libgd@e87ec88>
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Looks like a bit of a fix more than anything ? |
Like I wrote, the overflow checks are not necessary. And allocating a single large array instead of allocating an array per row is only an improvement. That said, I'm fine with targeting PHP-8.3. |
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my bad did not read your comment. Either way I m fine, once the very minor issue is fixed. |
Argh, I hate when that happens (unused variable). |
devnexen
approved these changes
Jan 4, 2025
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I've merged into master; I think that's good enough, and if someone complains, we can still consider to backport to lower branches. |
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This improvement was done for libgd 2.1.0[1], and the erroneous calculation has been fixed as of libgd 2.2.0[2].
While we're at it we also add the overflow checks of external libgd; these are not really necessary, since
.sx * .syoverflow was already prevented when the image has been created, and since we're usingsafe_emalloc()thestruct segoverflow is also prevented. It should be noted thatoverflow2()preventsintoverflow, whilesafe_emalloc()preventssize_toverflow, so the former is more restrictive. For parity with external libgd, this still appears to be a good thing.[1] libgd/libgd@86a5deb
[2] libgd/libgd@e87ec88