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Fixes Trac#10266.
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Commit 00e59a3122 introduced a change to savegame handling which
results in savegame thumbnails only being loaded when necessary.
ZVISION's readSaveGameHeader() doesn't under all circumstances
initialize the thumbnail pointer and 00e59a3122 failed to remove an
otherwise unnecessary delete which resulted in the uninitialized
thumbnail pointer being passed to delete (UB).
Thanks to eriktorbjorn for noticing.
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This commit introduces the following changes:
1. Graphics::loadThumbnail()
Now returns a boolean and takes a new argument skipThumbnail which
defaults to false. In case of true, loadThumbnail() reads past the
thumbnail data in the input stream instead of actually loading the
thumbnail. This simplifies savegame handling where, up until now,
many engines always read the whole savegame metadata (including
the thumbnail) and then threw away the thumbnail when not needed
(which is in almost all cases, the most common exception being
MetaEngine::querySaveMetaInfos() which is responsible for loading
savegame metadata for displaying it in the GUI launcher.
2. readSavegameHeader()
Engines which already implement such a method (name varies) now take
a new argument skipThumbnail (default: true) which is passed
through to loadThumbnail(). This means that the default case for
readSavegameHeader() is now _not_ loading the thumbnail from a
savegame and just reading past it. In those cases, e.g.
querySaveMetaInfos(), where we actually are interested in loading
the thumbnail readSavegameHeader() needs to explicitely be called
with skipThumbnail == false.
Engines whose readSavegameHeader() (name varies) already takes an
argument loadThumbnail have been adapted to have a similar
prototype and semantics.
I.e. readSaveHeader(in, loadThumbnail, header) now is
readSaveHeader(in, header, skipThumbnail).
3. Error handling
Engines which previously did not check the return value of
readSavegameHeader() (name varies) now do so ensuring that possibly
broken savegames (be it a broken thumbnail or something else) don't
make it into the GUI launcher list in the first place.
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To match official documentation (e.g. game manual, credits).
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A bug in commit 21e9007d80. Thanks to fingolfin for pointing it out
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This reverts commit 9f642074ba8e17aa23b01bcee82b2293fe84f8f1, as it
broke the credits screen in ZGI.
This has been rewritten to use the common save code
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This fixes the save game thumbnails when using the original save/load
screens
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