diff options
Diffstat (limited to 'dmagick/c/quantum.d')
| -rw-r--r-- | dmagick/c/quantum.d | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/dmagick/c/quantum.d b/dmagick/c/quantum.d index 4186c11..2a48c0a 100644 --- a/dmagick/c/quantum.d +++ b/dmagick/c/quantum.d @@ -68,14 +68,21 @@ extern(C) { if (value <= 0.0) return(cast(Quantum) 0); - if (value >= cast(MagickRealType) 65535UL) - return(cast(Quantum) 65535UL); + if (value >= cast(MagickRealType) QuantumRange) + return(cast(Quantum) QuantumRange); return(cast(Quantum) (value+0.5)); } static pure nothrow ubyte ScaleQuantumToChar(const Quantum quantum) { - return(cast(ubyte) (((quantum+128UL)-((quantum+128UL) >> 8)) >> 8)); + static if ( MagickQuantumDepth == 8 ) + return quantum; + else static if ( MagickQuantumDepth == 16 ) + return cast(ubyte) (((quantum+128UL)-((quantum+128UL) >> 8)) >> 8); + else static if ( MagickQuantumDepth == 32 ) + return cast(ubyte) (quantum+8421504UL/16843009UL ); + else + return cast(ubyte) (quantum/72340172838076673.0+0.5); } static pure nothrow Quantum ScaleCharToQuantum(ubyte value) |