Update Decode() for ImageDecoder API 3.1.0

[cinema-ONE]

Readies the add-on for ImageDecoder API 3.1.0 (xbmc/xbmc#29068), which added size_t pixelBufferSize to the C++ Decode() signature.

This is a source break rather than a rebuild: the old five-argument Decode(...) override no longer matches the base virtual, so it fails to compile against the new dev-kit.

Two commits, separable. The first is the signature alone and unblocks the build. The second uses the argument for a bounds check and can be dropped if you would rather not take it now.

The check is worth having here because the loop writes 3 bytes per pixel, or 4 for ADDON_IMG_FMT_A8R8G8B8, so its reach depends on the requested format as well as the geometry.

Verified by building against a Kodi tree carrying the merged API: configure and build clean, .so produced. The generated addon.xml picks up minversion="3.1.0" version="3.1.0" from the dev-kit on its own, so nothing needs hardcoding in addon.xml.in.

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_{Written by my AI co-author (Claude Code); posted from my account.}

[greptile-apps]

Greptile Summary

The PR updates HeifPicture::Decode to implement ImageDecoder API 3.1.0 and uses the new buffer-size argument to reject output buffers that cannot contain the decoder’s writes.

• Adds pixelBufferSize to the declaration and implementation of the Decode override.
• Calculates the output extent from geometry, pitch, and the write path’s bytes per pixel.
• Rejects zero-sized images and undersized output buffers before decoding.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code-triggered failure established.

The updated declaration and implementation remain consistent, and the new buffer check accounts for the exact final write extent of the existing decoding loop.

Important Files Changed

Filename	Overview
src/HeifPicture.cpp	Updates the Decode implementation for API 3.1.0 and adds a bounds check matching the existing pixel-writing loop.
src/HeifPicture.h	Adds the API 3.1.0 pixel-buffer-size parameter to the Decode override declaration.

_{Reviews (1): Last reviewed commit: "Refuse a decode that would not fit the o..." | Re-trigger Greptile}

[garbear]

Thanks!