System.UITypes.TAlphaColorF
Delphi
TAlphaColorF = record
public const
Epsilon = 1.5259E-05; // 1 / 65535, minimal value for TPixelFormat.RGBA16 components
private
class function SameComponent(const Value1, Value2: Single): Boolean; static; inline;
class function ClampComponent(const Value: Single): Single; static; inline;
public
R, G, B, A: Single;
class function Create(const R, G, B: Single; const A: Single = 1): TAlphaColorF; overload; static; inline;
class function Create(const Color: TAlphaColor): TAlphaColorF; overload; static; inline;
class operator Add(const Color1, Color2: TAlphaColorF): TAlphaColorF;
class operator Subtract(const Color1, Color2: TAlphaColorF): TAlphaColorF;
class operator Equal(const Color1, Color2: TAlphaColorF): Boolean;
class operator NotEqual(const Color1, Color2: TAlphaColorF): Boolean;
class operator Negative(const Color: TAlphaColorF): TAlphaColorF;
class operator Multiply(const Color1, Color2: TAlphaColorF): TAlphaColorF;
class operator Multiply(const Color: TAlphaColorF; const Factor: Single): TAlphaColorF;
class operator Multiply(const Factor: Single; const Color: TAlphaColorF): TAlphaColorF; inline;
class operator Divide(const Color: TAlphaColorF; const Factor: Single): TAlphaColorF; inline;
function PremultipliedAlpha: TAlphaColorF;
function UnpremultipliedAlpha: TAlphaColorF;
function Clamp: TAlphaColorF;
function ToAlphaColor: TAlphaColor;
end;
C++
struct DECLSPEC_DRECORD TAlphaColorF
{
public:
#define TAlphaColorF_Epsilon (1.525900E-05)
private:
static bool __fastcall SameComponent(const float Value1, const float Value2);
static float __fastcall ClampComponent(const float Value);
public:
float R;
float G;
float B;
float A;
static TAlphaColorF __fastcall Create(const float R, const float G, const float B, const float A = 1.000000E+00f)/* overload */;
static TAlphaColorF __fastcall Create(const TAlphaColor Color)/* overload */;
static TAlphaColorF __fastcall _op_Addition(const TAlphaColorF &Color1, const TAlphaColorF &Color2);
static TAlphaColorF __fastcall _op_Subtraction(const TAlphaColorF &Color1, const TAlphaColorF &Color2);
static bool __fastcall _op_Equality(const TAlphaColorF &Color1, const TAlphaColorF &Color2);
static bool __fastcall _op_Inequality(const TAlphaColorF &Color1, const TAlphaColorF &Color2);
static TAlphaColorF __fastcall _op_UnaryNegation(const TAlphaColorF &Color);
static TAlphaColorF __fastcall _op_Multiply(const TAlphaColorF &Color1, const TAlphaColorF &Color2);
static TAlphaColorF __fastcall _op_Multiply(const TAlphaColorF &Color, const float Factor);
static TAlphaColorF __fastcall _op_Multiply(const float Factor, const TAlphaColorF &Color);
static TAlphaColorF __fastcall _op_Division(const TAlphaColorF &Color, const float Factor);
TAlphaColorF __fastcall PremultipliedAlpha(void);
TAlphaColorF __fastcall UnpremultipliedAlpha(void);
TAlphaColorF __fastcall Clamp(void);
TAlphaColor __fastcall ToAlphaColor(void);
};
Propriétés
| Type | Visibilité | Source | Unité | Parent |
|---|---|---|---|---|
record struct |
public | System.UITypes.pas System.UITypes.hpp |
System.UITypes | System.UITypes |
Description
TAlphaColorF est un type de couleur qui traite les composants R, G, B et A comme des flottants.
TAlphaColorF est utilisé dans des opérations de traitement des couleurs nécessitant un niveau de précision élevé : chaque composant R, G, B et A est traité comme des flottants. Les opérateurs surchargés autorisent l'ajout, la soustraction et la multiplication des couleurs à l'aide d'opérations normales (comme "FinalColor := (FirstColor + SecondColor) / 2").
Auparavant, la conversion du format des pixels reposait sur System.Math.Vectors.TVector3D, qui était traité comme une couleur. Désormais, la conversion du format des pixels utilise à cette fin les nouveaux types de couleur dans TVector3D.