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ENGINES: Return unknown game variants with the list of detected games
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v5+ scripts can request saving/loading of savegames, this type of
savegame is internally called a "temporary" savegame
(_saveStateTemporary == true) which is invisible to the user (I'm not
sure whether this is by design or not).
Currently the savegame handling in scummLoop_handleSaveLoad() doesn't
distinguish between such temporary savegames and normal autosaves and
unconditionally resets _lastSaveTime (even after loading).
This has the unwanted side effect of potentially delaying the creation
of normal autosaves which are supposed to be created in accordance with
the autosave period setting in the GUI.
This commit makes sure that _lastSaveTime only gets updated if and only
if saving a (non-temporary) autosave.
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Both means to calculate `diff` are essentially equal because
wraparound of unsigned integers is well-defined and does what
the 'else' branch is simulating manually. Because of this,
gcc complains when compiling with -Wduplicated-branches.
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the Add Game feature
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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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On my AZERTY keyboard the period is obtained using SHIFT + ; and
the code checking the PERIOD keycode and no modifier was failing
on both account. The manual for my French DOTT mentions the period
key, but I have not actually checked how it worked with the original
executable and if using the semicolon key without shift or using the
colon key (which would be the period key on a English-US layout)
works.
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Drawing nows happens directly when the Dialog or Widget draw methods are
called. This makes it easy to debug why a particular low level draw
method was called, by inspecting the call stack.
This replaces the notion of "buffering" by two independant ways to
control what is drawn and where:
- The active layer is used to select whether the foreground or
background part of the dialogs are rendered by the draw calls.
- The active surface is used to select if the draw calls affect the back
buffer or the screen.
The foreground layer of the active dialog is drawn directly to the
screen. Its background layer is drawn to the back buffer. This way
widgets can restore the back buffer in order to update without having to
redraw the dialog's background.
Dialogs lower in the dialog stack are drawn entirely to the back buffer.
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and comment/cleanup
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There are too many regressions.
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Rewrote the detection matching to use the extra field like the other
two.
This requires extensive testing due to touching code shared for a lot of
games and being sensitive to individual versions of games.
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Fixes Trac#10342.
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This happens when clicking on the triangular button in room 27 in
The Dig.
There are probably several other places where this overflow
happens, since there are several different `int args[16]` in
the code (and many more `int args[` of various sizes, not all of
which are at least NUM_SCRIPT_LOCAL).
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This happens at least when trying to right click on the motorcycle
at the start of Full Throttle.
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It looks like the code was there, but it was never fully implemented
because _curSoundPos was never being incremented. Experimentally,
it looks like it works if it is a 60FPS counter.
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This situation is triggered normally when _currentScript is 0xFF,
but it could potentially also happen if _currentScript is some
other number >= NUM_SCRIPT_SLOT, so the check is a bit more
conservative than it might appear to need to be.
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As per discussion in bug #10116.
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Fixes bug #10116
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Fixes Trac#6272.
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