BGRABitmap图像操作8：大理石纹理

unit Unit1;

{$mode objfpc}{$H+}

interface

uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
BGRABitmap, BGRABitmapTypes, BGRAGradients, math;

type

{ TForm1 }

TForm1 = class(TForm)
procedure FormPaint(Sender: TObject);
private
{ private declarations }
public
{ public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.lfm}

{ TForm1 }

function Interp256(value1,value2,position: integer): integer; inline;
begin
result := (value1*(256-position) + value2*position) shr 8;
end;

function Interp256(color1,color2: TBGRAPixel; position: integer): TBGRAPixel; inline;
begin
result.red := Interp256(color1.red,color2.red, position);
result.green := Interp256(color1.green,color2.green, position);
result.blue := Interp256(color1.blue,color2.blue, position);
result.alpha := Interp256(color1.alpha,color2.alpha, position);
end;

function CreateCustomTexture(tx,ty: integer): TBGRABitmap;
var
colorOscillation: integer;
p: PBGRAPixel;
i: Integer;
begin
result := CreateCyclicPerlinNoiseMap(tx,ty,1,1,1);
p := result.Data;
for i := 0 to result.NbPixels-1 do
begin
//colorOscillation := round(((sin(p^.red*Pi/32)+1)/2)*256);
colorOscillation := round(power((sin(p^.red*Pi/80)+1)/2,0.2)*256);
p^ := Interp256(BGRA(181,157,105),BGRA(228,227,180),colorOscillation);
inc(p);
end;
end;

procedure TForm1.FormPaint(Sender: TObject);
var
image,tex: TBGRABitmap;

begin
image := TBGRABitmap.Create(ClientWidth,ClientHeight,ColorToBGRA(ColorToRGB(clBtnFace)));

tex := CreateCustomTexture(100,100);
image.FillRoundRectAntialias(20,20,300,200,20,20,tex);
image.RoundRectAntialias(20,20,300,200,20,20,BGRABlack,1);
tex.free;

image.Draw(Canvas,0,0,True);
image.free;

end;

end.