delphi 图片加水印源代码
作者:互联网
unit UWaterMark; interface uses {$IFNDEF DELPHIXE2ANDUP} windows,SysUtils,classes,graphics,Gdiplus; {$ELSE} winapi.windows, System.SysUtils,System.Classes,Vcl.Graphics,Gdiplus; {$ENDIF} type TWaterMarker=class private fSourcePic,fWaterMarkPic,fCopyRight:string; fResolution:Single; Photo: TGpImage; PhWidth: Integer; PhHeight: Integer; Watermark: TGpImage; WmWidth: Integer; WmHeight: Integer; Bmp: TGpBitmap; procedure setSourcePic(value:string); procedure setWaterMarkPic(value:string); procedure setCopyRight(value:string); procedure setResolution(value:single) ; public constructor create(sourcePic:string='';waterMarkPic: string=''); destructor destroy();override; procedure prepare(); procedure Render(bShowCopyRight: boolean;fontSize:single=20); procedure save; procedure Show(Handle: HDC); published property SourcePic:string read fSourcePic write setSourcePic; property WaterMarkPic:string read fWaterMarkPic write setWaterMarkPic; property CopyRight:string read fCopyRight write setCopyRight; property Resolution:single read fResolution write setResolution; end; implementation uses GdipTypes; { TWaterMarker } constructor TWaterMarker.create(sourcePic:string='';waterMarkPic: string=''); begin fSourcePic:=sourcePic; fWaterMarkPic:=waterMarkPic; fCopyRight := 'Copyright ? WaterMark '; fResolution:=72; //分辨率为72 end; procedure TWaterMarker.prepare(); begin if not fileExists(fSourcePic) then Exit; if not fileExists(fWaterMarkPic) then Exit; // 读取原始图片 Photo := TGpImage.Create(sourcePic); PhWidth := Photo.Width; PhHeight := Photo.Height; // 读取水印图片 Watermark := TGpImage.Create(waterMarkPic); WmWidth := Watermark.Width; WmHeight := Watermark.Height; // 建立一个新的位图 Bmp := TGpBitmap.Create(PhWidth, PhHeight, pf32bppArgb); Bmp.SetResolution(fResolution, fResolution); end; destructor TWaterMarker.destroy; begin if assigned(Photo) then Photo.Free; if assigned(Watermark) then Watermark.Free; if assigned(Bmp) then Bmp.Free; inherited; end; procedure TWaterMarker.Render(bShowCopyRight: boolean;fontSize:single=20); const ColorMatrix: TColorMatrix = ( (1.0, 0.0, 0.0, 0.0, 0.0), (0.0, 1.0, 0.0, 0.0, 0.0), (0.0, 0.0, 1.0, 0.0, 0.0), (0.0, 0.0, 0.0, 0.5, 0.0), (0.0, 0.0, 0.0, 0.0, 1.0) ); var gp: TGpGraphics; imageAttr: TGpImageAttributes; strFormat: TGpStringFormat; font: TGpFont; x, y: Single; begin // 建立新位图的画布,并设置图像显示质量和文本显示质量 if (Not assigned(Bmp)) or (Bmp=nil) then Exit; gp := TGpGraphics.Create(Bmp); gp.SmoothingMode := smAntiAlias; gp.TextRenderingHint := thAntiAlias; // 在画布上画原始图片 gp.DrawImage(Photo, GpRect(0, 0, PhWidth, PhHeight), 0, 0, PhWidth, PhHeight, utPixel); // 建立图像显示辅助类 imageAttr := TGpImageAttributes.Create; // 设置透明颜色为水印图片四角的底色,水印图显示为圆角图片 imageAttr.SetColorKey($ff00ff00, $ff00ff00, ctBitmap); // 设置水印图片不透明度为0.3 imageAttr.SetColorMatrix(ColorMatrix, cfDefault, ctBitmap); // 在画布右下角画水印图 gp.DrawImage(Watermark, GpRect(PhWidth - WmWidth - 10,PhHeight-WmHeight- 10, WmWidth, WmHeight), 0, 0, WmWidth, WmHeight, utPixel, imageAttr); if bShowCopyRight then begin // 设置文本字体和显示格式 font := TGpFont.Create('arial', fontSize, [fsBold]); strFormat := TGpStringFormat.Create; strFormat.Alignment := saCenter; // 在画布下方居中显示阴影文本 x := PhWidth / 2; y := PhHeight - 36; gp.DrawString(fCopyRight, font, Brushs[$99000000], x + 1, y + 1, strFormat); gp.DrawString(fCopyRight, font, Brushs[$99ffffff], x, y, strFormat); font.Free; strFormat.Free; end; imageAttr.Free; gp.Free; end; procedure TWaterMarker.save; var Clsid: TGUID; Parameters: TEncoderParameters; Quality: Integer; begin if not fileexists(fSourcePic) then Exit; if (not assigned(Bmp)) or (Bmp=nil) then Exit; // 设置图像品质编码参数 Parameters.Count := 1; Parameters.Parameter[0].Guid := EncoderQuality; Parameters.Parameter[0].ValueType := EncoderParameterValueTypeLong; Parameters.Parameter[0].NumberOfValues := 1; // 设置参数的值:品质等级,最高为100,图像文件大小与品质成正比 Quality := 100; Parameters.Parameter[0].Value := @Quality; if GetEncoderClsid('image/jpeg', Clsid) then Bmp.Save(changefileext(fSourcePic,'_watermark.jpg'), Clsid, @Parameters); end; procedure TWaterMarker.setCopyRight(value: string); begin fCopyRight:=value; end; procedure TWaterMarker.setResolution(value: single); begin fResolution:=value; end; procedure TWaterMarker.setSourcePic(value:string); begin fSourcePic:=value; end; procedure TWaterMarker.setWaterMarkPic(value: string); begin fWaterMarkPic:=value; end; procedure TWaterMarker.Show(Handle: HDC); var g: TGpGraphics; begin //将生成的水印效果图像直接显示到handle所在的画布上 g := TGpGraphics.Create(Handle); g.TranslateTransform(0, 0); g.DrawImage(bmp, 0, 0, PhWidth, PhHeight); g.Free; end; end.
var WM: TWaterMarker; begin // WM:=TWaterMarker.create('images/my.jpg','images/watermark.jpg'); WM:=TWaterMarker.create(); WM.SourcePic:='images/my.jpg'; WM.WaterMarkPic:='images/watermark.jpg'; WM.Resolution:=72; WM.prepare; WM.Render(true,30); // WM.save; WM.Show(self.Canvas.Handle); WM.Free ; WM:=nil; showmessage('ok'); end;
标签:end,string,0.0,delphi,TWaterMarker,加水,源代码,WM,procedure 来源: https://www.cnblogs.com/jijm123/p/14198026.html