diff options
| -rw-r--r-- | src/blitter/32bpp_base.hpp | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/src/blitter/32bpp_base.hpp b/src/blitter/32bpp_base.hpp index 1e9ae1d16..e69a7cbfd 100644 --- a/src/blitter/32bpp_base.hpp +++ b/src/blitter/32bpp_base.hpp @@ -54,9 +54,9 @@ public: /* The 256 is wrong, it should be 255, but 256 is much faster... */ return ComposeColour(0xFF, - (r * a + cr * (256 - a)) / 256, - (g * a + cg * (256 - a)) / 256, - (b * a + cb * (256 - a)) / 256); + ((int)(r - cr) * a) / 256 + cr, + ((int)(g - cg) * a) / 256 + cg, + ((int)(b - cb) * a) / 256 + cb); } /** @@ -79,15 +79,8 @@ public: uint r = GB(colour, 16, 8); uint g = GB(colour, 8, 8); uint b = GB(colour, 0, 8); - uint cr = GB(current, 16, 8); - uint cg = GB(current, 8, 8); - uint cb = GB(current, 0, 8); - /* The 256 is wrong, it should be 255, but 256 is much faster... */ - return ComposeColour(0xFF, - (r * a + cr * (256 - a)) / 256, - (g * a + cg * (256 - a)) / 256, - (b * a + cb * (256 - a)) / 256); + return ComposeColourRGBANoCheck(r, g, b, a, current); } /** |