在使用Bitblt()时,如何使背景色透明? 请大家帮助,困扰我两天了,我的背景颜色是白色的,怎么能让背景色变成透明呢。 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 procedure TSubtitleEdit.DrawTransparentBmp(Cnv: TCanvas; x,y: Integer; Bmp: TBitmap; clTransparent: TColor);var bmpXOR, bmpAND, bmpINVAND, bmpTarget: TBitmap; oldcol: Longint;begin try bmpAND := TBitmap.Create; bmpAND.Width := Bmp.Width; bmpAND.Height := Bmp.Height; bmpAND.Monochrome := True; oldcol := SetBkColor(Bmp.Canvas.Handle, ColorToRGB(clTransparent)); BitBlt(bmpAND.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Bmp.Canvas.Handle, 0,0, SRCCOPY); SetBkColor(Bmp.Canvas.Handle, oldcol); bmpINVAND := TBitmap.Create; bmpINVAND.Width := Bmp.Width; bmpINVAND.Height := Bmp.Height; bmpINVAND.Monochrome := True; BitBlt(bmpINVAND.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, bmpAND.Canvas.Handle, 0,0, NOTSRCCOPY); bmpXOR := TBitmap.Create; bmpXOR.Width := Bmp.Width; bmpXOR.Height := Bmp.Height; BitBlt(bmpXOR.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Bmp.Canvas.Handle, 0,0, SRCCOPY); BitBlt(bmpXOR.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, bmpINVAND.Canvas.Handle, 0,0, SRCAND); bmpTarget := TBitmap.Create; bmpTarget.Width := Bmp.Width; bmpTarget.Height := Bmp.Height; BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Cnv.Handle, x,y, SRCCOPY); BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, bmpAND.Canvas.Handle, 0,0, SRCAND); BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, bmpXOR.Canvas.Handle, 0,0, SRCINVERT); BitBlt(Cnv.Handle, x,y,Bmp.Width,Bmp.Height, bmpTarget.Canvas.Handle, 0,0, SRCCOPY); finally bmpXOR.Free; bmpAND.Free; bmpINVAND.Free; bmpTarget.Free; end;end; TransparentBlt 饭桶JR,YY群的凶兄弟、劫妹要你回群吃饭 哪种Delphi2009的报表控件 终端用户可以自己修改? vista上网问题! update更新语句!!!!不知道怎么写! 如何实现定时关机的程序 ComboBox.Item选中用什么方法? 编码问题:如何将一个函数做为另一个函数的参数传递??? 求《Delphi 7项目开发实践》书盘中的错误信息 求助~~!! 程序运行中报错 DBGridEh中的单价列如何判断是不是有效的数值型? 寻求delphi中KOL的GetKeyNames用法。
clTransparent: TColor);
var
bmpXOR, bmpAND, bmpINVAND, bmpTarget: TBitmap;
oldcol: Longint;
begin
try
bmpAND := TBitmap.Create;
bmpAND.Width := Bmp.Width;
bmpAND.Height := Bmp.Height;
bmpAND.Monochrome := True;
oldcol := SetBkColor(Bmp.Canvas.Handle, ColorToRGB(clTransparent));
BitBlt(bmpAND.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Bmp.Canvas.Handle,
0,0, SRCCOPY);
SetBkColor(Bmp.Canvas.Handle, oldcol); bmpINVAND := TBitmap.Create;
bmpINVAND.Width := Bmp.Width;
bmpINVAND.Height := Bmp.Height;
bmpINVAND.Monochrome := True;
BitBlt(bmpINVAND.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height,
bmpAND.Canvas.Handle, 0,0, NOTSRCCOPY); bmpXOR := TBitmap.Create;
bmpXOR.Width := Bmp.Width;
bmpXOR.Height := Bmp.Height;
BitBlt(bmpXOR.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Bmp.Canvas.Handle,
0,0, SRCCOPY);
BitBlt(bmpXOR.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height,
bmpINVAND.Canvas.Handle, 0,0, SRCAND); bmpTarget := TBitmap.Create;
bmpTarget.Width := Bmp.Width;
bmpTarget.Height := Bmp.Height;
BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height, Cnv.Handle, x,y,
SRCCOPY);
BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height,
bmpAND.Canvas.Handle, 0,0, SRCAND);
BitBlt(bmpTarget.Canvas.Handle, 0,0,Bmp.Width,Bmp.Height,
bmpXOR.Canvas.Handle, 0,0, SRCINVERT);
BitBlt(Cnv.Handle, x,y,Bmp.Width,Bmp.Height, bmpTarget.Canvas.Handle, 0,0,
SRCCOPY);
finally
bmpXOR.Free;
bmpAND.Free;
bmpINVAND.Free;
bmpTarget.Free;
end;
end;