GDI+ 学习记录(28): 图像颜色的数据格式 PixelFormat

//指定位图颜色
var
  g,gbit: TGPGraphics;
  bit1,bit2: TGPBitmap;
  sb: TGPSolidBrush;
begin
  //Self.Color := clWhite;
  g := TGPGraphics.Create(Canvas.Handle);
  sb := TGPSolidBrush.Create(MakeColor(255,0,0)); {画刷为红色}

  bit1 := TGPBitmap.Create(200, 32, PixelFormat32bppARGB);   {指定为 32 位颜色}
  bit2 := TGPBitmap.Create(200, 32, PixelFormat1bppIndexed); {只有两种颜色}

  gbit := TGPGraphics.Create(bit1);
  gbit.FillRectangle(sb, 0, 0, 200, 32);
  g.DrawImage(bit1, 11, 11, bit1.GetWidth, bit1.GetHeight); {画出来是红色}

  gbit := TGPGraphics.Create(bit2);
  gbit.FillRectangle(sb, 0, 0, 200, 32);
  g.DrawImage(bit2, 11, 100, bit2.GetWidth, bit2.GetHeight); {画出来是黑色, 它只有黑白两色}

  sb.Free;
  bit1.Free;
  bit2.Free;
  gbit.Free;
  g.Free;
end;