diff options
Diffstat (limited to 'src/blitter/32bpp_base.cpp')
| -rw-r--r-- | src/blitter/32bpp_base.cpp | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/blitter/32bpp_base.cpp b/src/blitter/32bpp_base.cpp index 26dd2f037..c396e4541 100644 --- a/src/blitter/32bpp_base.cpp +++ b/src/blitter/32bpp_base.cpp @@ -143,6 +143,36 @@ void Blitter_32bppBase::PaletteAnimate(const Palette &palette) /* By default, 32bpp doesn't have palette animation */ } +Colour Blitter_32bppBase::ReallyAdjustBrightness(Colour colour, uint8 brightness) +{ + assert(DEFAULT_BRIGHTNESS == 1 << 7); + + uint64 combined = (((uint64) colour.r) << 32) | (((uint64) colour.g) << 16) | ((uint64) colour.b); + combined *= brightness; + + uint16 r = GB(combined, 39, 9); + uint16 g = GB(combined, 23, 9); + uint16 b = GB(combined, 7, 9); + + if ((combined & 0x800080008000L) == 0L) { + return Colour(r, g, b, colour.a); + } + + uint16 ob = 0; + /* Sum overbright */ + if (r > 255) ob += r - 255; + if (g > 255) ob += g - 255; + if (b > 255) ob += b - 255; + + /* Reduce overbright strength */ + ob /= 2; + return Colour( + r >= 255 ? 255 : min(r + ob * (255 - r) / 256, 255), + g >= 255 ? 255 : min(g + ob * (255 - g) / 256, 255), + b >= 255 ? 255 : min(b + ob * (255 - b) / 256, 255), + colour.a); +} + Blitter::PaletteAnimation Blitter_32bppBase::UsePaletteAnimation() { return Blitter::PALETTE_ANIMATION_NONE; |