相关疑难解决方法(0)

在寻找替代GDI的替代方案时,我试图在Windows 7中测试Delphi的2010 TDirect2DCanvas性能.

我通过使用Direct2D绘制一条巨大的折线来测试它,结果非常慢,即使数据量少于我使用GDI进行相同测试的数量少500倍(我甚至没有在GDI中使用位图作为后备缓冲,我只是直接绘制到表单画布).

所以我想:
a) Direct2D比GDI慢;
b) TDirect2DCanvas很慢;
c)我做错了什么
,希望它是c).

我写的测试代码是:

unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, Direct2D, D2D1;

type
  TForm2 = class(TForm)
  private
    { Private declarations }
    FD2DCanvas: TDirect2DCanvas;
    FData: array[0..50000] of TPoint;
  public
    procedure CreateWnd; override;
    procedure WMSize(var Message: TWMSize); message WM_SIZE;
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;


    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

uses utils;

{$R *.dfm}

procedure TForm2.CreateWnd;
var
  i: Integer; …