Commit 4d6affd74d ("Fix SDL-only briefing crash") added a hack to
prevent a crash when the briefing window is automatically resized.
However, a logic error in that hack causes some subcanvases that were
not wrong to be truncated. Change the logic to fix those subcanvases,
such as the one used for rendering a background in the High Scores
window. The new logic still avoids the crash in in SDL-only mode.
Fixes: 4d6affd74d ("Fix SDL-only briefing crash")
Trim the bitmap's current width and height to be not more than its
parent. Otherwise, an automatic screen resize, such as triggered when
playing the robot briefings in Descent 2, will give the window a new
smaller bm_data, but continue to use the old dimensions. This then
causes load_briefing_screen -> gr_bitmap_scale_to -> scale_line to write
off the end of the smaller bm_data, causing memory corruption and
eventually a crash.
gr_init_bitmap can be passed a pointer to uninitialized memory, and
will save that pointer into the bitmap for the underlying memory to be
initialized later. In gcc-11, this triggers a warning because the
`const` qualifier leads gcc to expect that the memory will only be read
(while uninitialized) and not written.
Reported-by: TheDemonicSurfer <https://github.com/dxx-rebirth/dxx-rebirth/issues/593>
Bitmaps based on grs_main_bitmap own their data. Bitmaps based on
grs_bitmap do not. Adjust prototypes to prevent initializing a
grs_main_bitmap with data it will not own.
`build_colormap_good` only took `used` to clear it. Only one caller
needed it cleared. Move the clear into that caller. Remove the
parameter from all calls.
Rename symbol OGL to DXX_USE_OGL to show that it is a DXX
symbol, not one inherited from a library. Move it to dxxsconf.h to
shorten the command line.
This is a mostly automated transform, but the changes to SConstruct were
manual.
git grep -lzw OGL -- '*.h' '*.cpp' | xargs -0 sed -i -e 's/\(\s*#\s*if\)def\s*OGL/\1 DXX_USE_OGL/' -e 's/\(\s*#\s*if\)ndef OGL/\1 !DXX_USE_OGL/' -e 's/\(\s*#\s*if !\?\)defined(OGL)/\1DXX_USE_OGL/'
