Christoph M. Becker bccbd2df21 Fix #69024: imagescale segfault with palette based image ...

imagescale(..., IMG_BICUBIC) is not supposed to work with palette images, so we
fix that by converting to true color if necessary. Basically the same fix has
already been applied to the external libgd[1].

[1] <https://github.com/libgd/libgd/commit/723ea520bed3b5854df87393c687323d3930edf3>

2015-07-13 15:43:16 +02:00

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