diff options
| -rw-r--r-- | src/base/UImage.pas | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/src/base/UImage.pas b/src/base/UImage.pas index 6bdad920..8dc38495 100644 --- a/src/base/UImage.pas +++ b/src/base/UImage.pas @@ -887,8 +887,14 @@ end; procedure ColorizeImage(ImgSurface: PSDL_Surface; NewColor: cardinal); - // for the conversion of colors from rgb to hsv space and back - // simply check the wikipedia. + // First, the rgb colors are converted to hsv, second hue is replaced by + // the NewColor, saturation and value remain unchanged, finally this + // hsv color is converted back to rgb space. + // For the conversion algorithms of colors from rgb to hsv space + // and back simply check the wikipedia. + // In order to speed up starting time of USDX the division of reals is + // replaced by division of longwords, shifted by 10 bits to keep + // digits. function ColorToHue(const Color: longword): longword; // returns hue within the range [0.0-6.0] but shl 10, ie. times 1024 @@ -954,7 +960,7 @@ begin + IntToStr(ImgSurface^.format.BytesPerPixel)); Hue := ColorToHue(NewColor); // Hue is shl 10 - f := Hue and $3ff; + f := Hue and $3ff; // f is the dezimal part of hue HueInteger := Hue shr 10; for PixelIndex := 0 to (ImgSurface^.W * ImgSurface^.H)-1 do @@ -1037,13 +1043,13 @@ begin end; {$IFDEF FPC_BIG_ENDIAN} - PixelColors[3] := Red ; - PixelColors[2] := Green ; - PixelColors[1] := Blue ; + PixelColors[3] := Red; + PixelColors[2] := Green; + PixelColors[1] := Blue {$ELSE} - PixelColors[0] := Red ; - PixelColors[1] := Green ; - PixelColors[2] := Blue ; + PixelColors[0] := Red; + PixelColors[1] := Green; + PixelColors[2] := Blue; {$ENDIF} end; |