diff options
Diffstat (limited to 'src/gfx.cpp')
| -rw-r--r-- | src/gfx.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/gfx.cpp b/src/gfx.cpp index ff2c80bfc..46870dc42 100644 --- a/src/gfx.cpp +++ b/src/gfx.cpp @@ -1201,6 +1201,30 @@ void GfxInitPalettes() DoPaletteAnimations(); } +/** + * Copy the current palette if the palette was updated. + * Used by video-driver to get a current up-to-date version of the palette, + * to avoid two threads accessing the same piece of memory (with a good chance + * one is already updating the palette while the other is drawing based on it). + * @param local_palette The location to copy the palette to. + * @param force_copy Whether to ignore if there is an update for the palette. + * @return True iff a copy was done. + */ +bool CopyPalette(Palette &local_palette, bool force_copy) +{ + if (!force_copy && _cur_palette.count_dirty == 0) return false; + + local_palette = _cur_palette; + _cur_palette.count_dirty = 0; + + if (force_copy) { + local_palette.first_dirty = 0; + local_palette.count_dirty = 256; + } + + return true; +} + #define EXTR(p, q) (((uint16)(palette_animation_counter * (p)) * (q)) >> 16) #define EXTR2(p, q) (((uint16)(~palette_animation_counter * (p)) * (q)) >> 16) |