diff options
Diffstat (limited to '')
| -rw-r--r-- | src/base/UImage.pas | 159 |
1 files changed, 99 insertions, 60 deletions
diff --git a/src/base/UImage.pas b/src/base/UImage.pas index dfd47d12..01dfe9ea 100644 --- a/src/base/UImage.pas +++ b/src/base/UImage.pas @@ -798,7 +798,7 @@ end; * Image manipulation *******************************************************) - + function PixelFormatEquals(fmt1, fmt2: PSDL_PixelFormat): boolean; begin if (fmt1^.BitsPerPixel = fmt2^.BitsPerPixel) and @@ -828,7 +828,7 @@ end; procedure FitImage(var ImgSurface: PSDL_Surface; Width, Height: Cardinal); var TempSurface: PSDL_Surface; - ImgFmt: PSDL_PixelFormat; + ImgFmt: PSDL_PixelFormat; begin TempSurface := ImgSurface; @@ -894,89 +894,128 @@ end; procedure ColorizeImage(ImgSurface: PSDL_Surface; NewColor: cardinal); - // returns hue within the range [0.0-6.0) - function col2hue(Color: longword): double; + // for the conversion of colors from rgb to hsv space and back + // simply check the wikipedia. + + function col2hue(const Color: longword): longword; + // returns hue within the range [0.0-6.0] but shl 10, ie. times 1024 var - clr: array[0..2] of double; - hue, max, delta: double; + red, green, blue: longword; + min, max, delta: longword; + hue: double; begin - // division by 255 is omitted, since it is implicitly done when deviding by delta - clr[0] := ((Color and $ff0000) shr 16); // R - clr[1] := ((Color and $ff00) shr 8); // G - clr[2] := (Color and $ff) ; // B - max := maxvalue(clr); - delta := max - minvalue(clr); + // extract the colors + // division by 255 is omitted, since it is implicitly done + // when deviding by delta + red := ((Color and $ff0000) shr 16); // R + green := ((Color and $ff00) shr 8); // G + blue := (Color and $ff) ; // B + + min := red; + if green < min then min := green; + if blue < min then min := blue; + + max := red; + if green > max then max := green; + if blue > max then max := blue; + // calc hue - if (delta = 0.0) then hue := 0 - else if (clr[0] = max) then hue := (clr[1]-clr[2])/delta - else if (clr[1] = max) then hue := 2.0+(clr[2]-clr[0])/delta - else if (clr[2] = max) then hue := 4.0+(clr[0]-clr[1])/delta; - if (hue < 0.0) then - hue := hue + 6.0; - Result := hue; + delta := max - min; + if (delta = 0) then + Result := 0 + else + begin + if (max = red ) then hue := (green - blue )/delta + else if (max = green) then hue := 2.0 + (blue - red )/delta + else if (max = blue ) then hue := 4.0 + (red - green)/delta; + if (hue < 0.0) then + hue := hue + 6.0; + Result := trunc(hue*1024); // '*1024' is shl 10 + end; end; var - DestinationHue: double; PixelIndex: longword; Pixel: PByte; PixelColors: PByteArray; - clr: array[0..2] of longword; // [0: R, 1: G, 2: B] - hsv: array[0..2] of longword; // [0: H(ue), 1: S(aturation), 2: V(alue)] - dhue: longword; - delta, max: longword; - h_int: longword; + red, green, blue: longword; + hue, sat: longword; + min, max, delta: longword; + HueInteger: longword; f, p, q, t: longword; begin - DestinationHue := col2hue(NewColor); - - dhue := Trunc(DestinationHue*1024); Pixel := ImgSurface^.Pixels; + hue := col2hue(NewColor); // hue is shl 10 + f := hue and $3ff; + HueInteger := hue shr 10; + for PixelIndex := 0 to (ImgSurface^.W * ImgSurface^.H)-1 do begin PixelColors := PByteArray(Pixel); // inlined colorize per pixel // uses fixed point math + // shl 10 is used for divisions + // get color values - clr[0] := PixelColors[0] shl 10; - clr[1] := PixelColors[1] shl 10; - clr[2] := PixelColors[2] shl 10; + + red := PixelColors[0]; + green := PixelColors[1]; + blue := PixelColors[2]; + //calculate luminance and saturation from rgb - max := clr[0]; - if clr[1] > max then max := clr[1]; - if clr[2] > max then max := clr[2]; - delta := clr[0]; - if clr[1] < delta then delta := clr[1]; - if clr[2] < delta then delta := clr[2]; - delta := max-delta; - hsv[0] := dhue; // shl 8 - hsv[2] := max; // shl 8 - if (max = 0) then - hsv[1] := 0 + max := red; + if green > max then max := green; + if blue > max then max := blue ; + + if (max = 0) then // the color is black + begin + PixelColors[0] := 0; + PixelColors[1] := 0; + PixelColors[2] := 0; + end else - hsv[1] := (delta shl 10) div max; // shl 8 - h_int := hsv[0] and $fffffC00; - f := hsv[0]-h_int; //shl 10 - p := (hsv[2]*(1024-hsv[1])) shr 10; - q := (hsv[2]*(1024-(hsv[1]*f) shr 10)) shr 10; - t := (hsv[2]*(1024-(hsv[1]*(1024-f)) shr 10)) shr 10; - h_int := h_int shr 10; - case h_int of - 0: begin clr[0] := hsv[2]; clr[1] := t; clr[2] := p; end; // (v,t,p) - 1: begin clr[0] := q; clr[1] := hsv[2]; clr[2] := p; end; // (q,v,p) - 2: begin clr[0] := p; clr[1] := hsv[2]; clr[2] := t; end; // (p,v,t) - 3: begin clr[0] := p; clr[1] := q; clr[2] := hsv[2]; end; // (p,q,v) - 4: begin clr[0] := t; clr[1] := p; clr[2] := hsv[2]; end; // (t,p,v) - 5: begin clr[0] := hsv[2]; clr[1] := p; clr[2] := q; end; // (v,p,q) - end; + begin + min := red; + if green < min then min := green; + if blue < min then min := blue ; + + if (min = 255) then // the color is white + begin + PixelColors[0] := 255; + PixelColors[1] := 255; + PixelColors[2] := 255; + end + else // all colors except black and white + begin + delta := max - min; + sat := (delta shl 10) div max; // shl 10 - PixelColors[0] := clr[0] shr 10; - PixelColors[1] := clr[1] shr 10; - PixelColors[2] := clr[2] shr 10; + // take into account that sat and f are shl 10 + // the final p, q and t are unshifted + + p := (max*(1024-sat)) shr 10; + q := (max*(1024-(sat*f) shr 10)) shr 10; + t := (max*(1024-(sat*(1024-f)) shr 10)) shr 10; + + case HueInteger of + 0: begin red := max; green := t; blue := p; end; // (v,t,p) + 1: begin red := q; green := max; blue := p; end; // (q,v,p) + 2: begin red := p; green := max; blue := t; end; // (p,v,t) + 3: begin red := p; green := q; blue := max; end; // (p,q,v) + 4: begin red := t; green := p; blue := max; end; // (t,p,v) + 5: begin red := max; green := p; blue := q; end; // (v,p,q) + end; + + PixelColors[0] := red ; + PixelColors[1] := green ; + PixelColors[2] := blue ; + + end; + end; Inc(Pixel, ImgSurface^.format.BytesPerPixel); end; |