Four modes are supported:
- Use original size with no scaling
- Scale by an integral amount as much as possible but not bigger
than the window.
- Scale to fit the window while respecting the aspect ratio. There
may be black bars on the left and right, or on the top and bottom,
but not both. This is the default, and the old behaviour.
- Scale and stretch to fit the window. In this mode the aspecy ratio
is not respected and there is no black bars.
The mode is controled by the "scaling_mode" value (between 0 and 3) in
the config file.
Also add Crtl-Alt-s hotkey to cycle through scaling modes
When a 32-bit cursor has the same size as an 8- or 16-bit cursor,
the mouse surfaces were not being regenerated even though the
32-bit cursors have a different memory requirement. This lead to
memory corruption as an inappropriate surface would be used for
the other type of cursor.
The shoe-horned 32-bit cursor support is clearly showing its
scrappy nature here and probably ought to be revisited in the
future if the SurfaceSdl graphics manager sticks around.
Fixes Trac#10349, Trac#10350, Trac#10351.
If a game is doing a screen shake (for example, DOTT when the
stereo is on), and the user does an RTL, the screen shake offset
may get stuck if the engine does not reset it on shutdown. To
avoid this in all cases, just always reset the screen shake
whenever the graphics manager is told to switch to a new graphics
mode.
Normally, notifyMousePosition converts real mouse events into the
virtual coordinate system, but events only get sent through
notifyMousePosition if they are real events from SDL since that
method also decides if the real mouse is inside the content area or
not. As such, these fake events need to be pre-converted to virtual
coordinates or else the wrong values are sent through to the engine
when a scaler or AR correction is in use.
SDL does not like this and will raise an assertion when built with
internal SDL assertions turned on. With internal assertions turned
off, it will still call SDL_SetError any time a null pointer is
passed, though it will not raise an assertion or crash.
Since those GraphcisManager initialize the cursor position to (0,0) when
created the cursor was jumping to the top left corner and then moving
back to its initial position as soon as the mouse was moved. Now it
stays at its initial position.
There are still some issues with it when changing between OpenGL and
SurfaceSDL at the same time as toggling fullscreen. But it is not worse
than before.
If we do not update the area below the message, it is just blitted on top
of itself again and again and gets progressively less transparent. It also
causes artefacts when the mouse pass below the OSD message.
On the OpenPandora handheld, the OSD message would not render unless you
moved the cursor in the area where it was supposed to show.
Additionally, the OSD message was not transparent like in v1.8.
This commit fixes both these issues.
I noticed that in Maemo the cursor was offset after the SDL refactoring
in de2bbe3b97
In Maemo when entering fullscreen, ScummVM receives a SDL_VIDEORESIZE
event with the native touchscreen resolution rather than the current
window size. This causes a call to notifyResize.
Before that refactoring, notifyResize did nothing (in SDL1).
Now it calls handleResize but doesn't actually set a new video mode.
This messes up the coordinate mapping, causing an overcorrection for
the cursor position.
The SDL1 loop is not very optimal. Unfortunately all our existing
scalers only work in 16bpp and I don't have time to fix that right
now, so this is fine.
This ensures the window gets resized properly when a user changes
the scaler options in the GUI. Simply unlocking the window size on
a call to setGraphicsMode is not good enough, because the scaler
mode can be changed by games during mode switches, and we don't
want to reset the window size in that case.
32bpp cursor scaling is not available, but this should be fine as
many of the software scalers are not designed to work with >16bpp
data in any case.
This change also includes some minor cleanup of unnecessary #ifdefs
around code that works equally well with or without USE_RGB_COLOR,
to simplify the implementation.
Normally with SDL, a mouse motion event will be sent after the
system mouse cursor has been moved by a call to
SDL_WarpMouseInWindow, but if the system cursor cannot be moved
(e.g. because the window does not have mouse focus), games still
need to receive these mouse events so they can successfully update
the mouse position internally. Otherwise, games continue to think
the mouse is still in the original position and will continue to
try to perform whatever action is associated with that mouse
position.
Refs Trac#9689.
The SDL graphics manager was just ignoring calls from CursorMan to
set the cursor to a blank cursor, which meant engines that did not
immediately send a cursor to CursorMan at startup would still show
the launcher's cursor (usually with a broken palette).
The OpenGL graphics manager would try to generate and draw an
invalid cursor surface when receiving an empty cursor.
The only reason we show the system cursor outside the game area is
to show users where their mouse is when the window is resized and
the mouse is outside the game area. If the game cannot be
interacted with, then the mouse also does not need to be shown in
the black areas.
This patch refactors the OpenGL and SDL graphics backends,
primarily to unify window scaling and mouse handling, and to
fix coordinate mapping between the ScummVM window and the
virtual game screen when they have different aspect ratios.
Unified code for these two backends has been moved to a new
header-only WindowedGraphicsManager class, so named because it
contains code for managing graphics managers that interact with
a windowing system and render virtual screens within a larger
physical content window.
The biggest behavioral change here is with the coordinate
system mapping:
Previously, mouse offsets were converted by mapping the whole
space within the window as input to the virtual game screen
without maintaining aspect ratio. This was done to prevent
'stickiness' when the mouse cursor was within the window but
outside of the virtual game screen, but it caused noticeable
distortion of mouse movement speed on the axis with blank
space.
Instead of introducing mouse speed distortion to prevent
stickiness, this patch changes coordinate transformation to
show the system cursor when the mouse moves outside of the virtual
game screen when mouse grab is off, or by holding the mouse inside
the virtual game screen (instead of the entire window) when mouse
grab is on.
This patch also improves some other properties of the
GraphicsManager/PaletteManager interfaces:
* Nullipotent operations (getWidth, getHeight, etc.) of the
PaletteManager/GraphicsManager interfaces are now const
* Methods marked `virtual` but not inherited by any subclass have
been de-virtualized
* Extra unnecessary calculations of hardware height in
SurfaceSdlGraphicsManager have been removed
* Methods have been renamed where appropriate for clarity
(setWindowSize -> handleResize, etc.)
* C++11 support improved with `override` specifier added on
overridden virtual methods in subclasses (primarily to avoid
myself accidentally creating new methods in the subclasses
by changing types/names during refactoring)
Additional refactoring can and should be done at some point to
continue to deduplicate code between the OpenGL and SDL backends.
Since the primary goal here was to improve the coordinate mapping,
full refactoring of these backends was not completed here.
