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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Color.Rgb;
interface
uses
Boolean,
Comparator,
FloatingPoint._64,
Integer._32,
Integer._32.Positive,
Integer._8.Positive,
Mathematics.Sign,
Text;
type
PRgbColor = ^TRgbColor;
TRgbColor = packed record
private
function AsComparisonValue(): TPositiveInteger32;
public
Red: TPositiveInteger8;
Green: TPositiveInteger8;
Blue: TPositiveInteger8;
Alpha: TPositiveInteger8;
class function New(Red, Green, Blue: TPositiveInteger8; Alpha: TPositiveInteger8 = 255): TRgbColor; overload; static;
class function New(const Text: TText): TRgbColor; overload; static;
class function NewGray(Value: TPositiveInteger8): TRgbColor; static;
class operator Equal(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
class operator NotEqual(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
class operator GreaterThan(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
function Darker(Factor: TFloatingPoint64): TRgbColor;
function Lighter(Factor: TFloatingPoint64): TRgbColor;
function Blend(const Background: TRgbColor): TRgbColor;
function AsInteger32: TInteger32;
function AsText(): TText;
end;
TRgbColorComparator = class(TComparator<TRgbColor>)
protected
function GetComparisonValue(const Value: TRgbColor): TPositiveInteger32;
public
function Compare(const Left: TRgbColor; const Right: TRgbColor): TSign; override;
end;
implementation
uses
Mathematics,
Numeral.System.Hexadecimal;
{ TRgbColor }
function TRgbColor.AsComparisonValue(): TPositiveInteger32;
begin
Result := Red or (Green shl 8) or (Blue shl 16) or (Alpha shl 24);
end;
function TRgbColor.AsInteger32(): TInteger32;
begin
Result := Red or (Green shl 8) or (Blue shl 16) {or (Alpha shl 24)};
end;
function TRgbColor.AsText(): TText;
begin
Result := ByteToHexadecimal(Red) + ByteToHexadecimal(Green) + ByteToHexadecimal(Blue);
end;
function TRgbColor.Blend(const Background: TRgbColor): TRgbColor;
var
R1, G1, B1: TFloatingPoint64;
R2, G2, B2: TFloatingPoint64;
R3, G3, B3: TFloatingPoint64;
begin
R1 := Red / 255;
G1 := Green / 255;
B1 := Blue / 255;
R2 := Background.Red / 255;
G2 := Background.Green / 255;
B2 := Background.Blue / 255;
if R1 + G1 + B1 > 1.5 then
begin
R3 := R1 * R2;
G3 := G1 * G2;
B3 := B1 * B2;
end
else
begin
R3 := 1 - ((1 - R1) * (1 - R2));
G3 := 1 - ((1 - G1) * (1 - G2));
B3 := 1 - ((1 - B1) * (1 - B2));
end;
Result.Red := RoundToNearest(R3 * 255);
Result.Green := RoundToNearest(G3 * 255);
Result.Blue := RoundToNearest(B3 * 255);
Result.Alpha := (Alpha + Background.Alpha) div 2;
end;
function TRgbColor.Darker(Factor: TFloatingPoint64): TRgbColor;
begin
Factor := 1 / (Factor + 1);
Result.Red := Minimum(255, RoundToNearest(Red * Factor));
Result.Green := Minimum(255, RoundToNearest(Green * Factor));
Result.Blue := Minimum(255, RoundToNearest(Blue * Factor));
Result.Alpha := 255;
end;
class operator TRgbColor.Equal(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
begin
Result :=
(Left.Blue = Right.Blue)
and (Left.Green = Right.Green)
and (Left.Red = Right.Red)
and (Left.Alpha = Right.Alpha);
end;
class operator TRgbColor.GreaterThan(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
begin
Result := Left.AsComparisonValue() > Right.AsComparisonValue();
end;
function TRgbColor.Lighter(Factor: TFloatingPoint64): TRgbColor;
begin
Factor := Factor + 1;
Result.Red := Minimum(255, RoundToNearest(Red * Factor));
Result.Green := Minimum(255, RoundToNearest(Green * Factor));
Result.Blue := Minimum(255, RoundToNearest(Blue * Factor));
Result.Alpha := 255;
end;
class function TRgbColor.New(Red, Green, Blue: TPositiveInteger8; Alpha: TPositiveInteger8 = 255): TRgbColor;
begin
Result.Red := Red;
Result.Green := Green;
Result.Blue := Blue;
Result.Alpha := Alpha;
end;
class function TRgbColor.New(const Text: TText): TRgbColor;
var
IntegerValue: TPositiveInteger32;
begin
IntegerValue := HexadecimalToPositiveInteger32(Text);
Result := TRgbColor.New(
(IntegerValue and $FF0000) shr 16,
(IntegerValue and $FF00) shr 8,
IntegerValue and $FF
);
end;
class function TRgbColor.NewGray(Value: TPositiveInteger8): TRgbColor;
begin
Result.Red := Value;
Result.Green := Value;
Result.Blue := Value;
Result.Alpha := $FF;
end;
class operator TRgbColor.NotEqual(const Left: TRgbColor; const Right: TRgbColor): TBoolean;
begin
Result :=
(Left.Blue <> Right.Blue)
or (Left.Green <> Right.Green)
or (Left.Red <> Right.Red)
or (Left.Alpha <> Right.Alpha);
end;
{ TRgbColorComparator }
function TRgbColorComparator.Compare(const Left: TRgbColor; const Right: TRgbColor): TSign;
var
LeftValue: TPositiveInteger32;
RightValue: TPositiveInteger32;
begin
LeftValue := GetComparisonValue(Left);
RightValue := GetComparisonValue(Right);
if LeftValue < RightValue then
Result := sNegative
else if LeftValue > RightValue then
Result := sPositive
else
Result := sZero;
end;
function TRgbColorComparator.GetComparisonValue(const Value: TRgbColor): TPositiveInteger32;
begin
Result := Value.Red or (Value.Green shl 8) or (Value.Blue shl 16) or (Value.Alpha shl 24);
end;
end.
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