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這篇文章將為大家詳細(xì)講解有關(guān)使用.NET怎么生成水印,文章內(nèi)容質(zhì)量較高,因此小編分享給大家做個(gè)參考,希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。
方法1-System.Drawing給圖片加水印
System.Drawing.Image
原生屬于GDI的一部分,是Windows Only,但隨著NuGet包System.Drawing.Common
的發(fā)布,現(xiàn)在System.Drawing.Image
已經(jīng)支持linux:
Install-Package System.Drawing.Common -Version 4.5.1
以下代碼演示了如何從給圖片加水?。?/p>
// 加水印 var watermarkedStream = new MemoryStream(); using (var img = Image.FromStream(File.OpenRead(@"D:\_\WatermarkDemo.png"))) { using (var graphic = Graphics.FromImage(img)) { var font = new Font("微軟雅黑", 30, FontStyle.Bold, GraphicsUnit.Pixel); var color = Color.FromArgb(128, 255, 255, 255); var brush = new SolidBrush(color); var point = new Point(img.Width - 130, img.Height - 50); graphic.DrawString("水印在此", font, brush, point); img.Save(watermarkedStream, ImageFormat.Png); } }
效果如圖(沒有黃色剪頭):
附:Edi.Wang做了一個(gè)NuGet包,可以輕松地配置水印參數(shù):
NuGet:https://github.com/EdiWang/Edi.ImageWatermark
文章:https://edi.wang/post/2018/10/12/add-watermark-to-uploaded-image-aspnet-core
方法2-Direct2D/WIC給圖片加水印
Direct2D源于Windows 8/IE 10,安裝IE 10之后,Windows 7也能用。Direct2D基于Direct3D,很顯然,是Windows Only的。
Direct2D是Windows下一代的2D渲染庫(kù),隨著Direct2D一起發(fā)布的,還有Windows Imaging Component(簡(jiǎn)稱WIC)和DirectWrite。
相關(guān)說明和文檔鏈接:
技術(shù) | 說明 | 鏈接 |
---|---|---|
Direct2D | 基于硬件加速的2D圖形渲染 | Go |
WIC | 高性能圖片編碼、解碼 | Go |
DirectWrite | 基于硬件加速的文字渲染 | Go |
如果您打開鏈接看了一眼,就不難看出,這些技術(shù)都是基于COM的,但我們使用.NET,不是嗎?
好在我們有SharpDX
SharpDX對(duì)這些DirectX技術(shù)做了封裝,在這個(gè)Demo中,我們需要安裝SharpDX.Direct2D1和SharpDX.Mathematics兩個(gè)包:
Install-Package SharpDX.Direct2D1 -Version 4.2.0 Install-Package SharpDX.Mathematics -Version 4.2.0
以下代碼演示了如何使用SharpDX.Direct2D1給圖片加水?。?/p>
using D2D = SharpDX.Direct2D1; using DWrite = SharpDX.DirectWrite; using SharpDX; using SharpDX.IO; using WIC = SharpDX.WIC; MemoryStream AddWatermark(Stream fileName, string watermarkText) { using (var wic = new WIC.ImagingFactory2()) using (var d2d = new D2D.Factory()) using (var image = CreateWicImage(wic, fileName)) using (var wicBitmap = new WIC.Bitmap(wic, image.Size.Width, image.Size.Height, WIC.PixelFormat.Format32bppPBGRA, WIC.BitmapCreateCacheOption.CacheOnDemand)) using (var target = new D2D.WicRenderTarget(d2d, wicBitmap, new D2D.RenderTargetProperties())) using (var bmpPicture = D2D.Bitmap.FromWicBitmap(target, image)) using (var dwriteFactory = new SharpDX.DirectWrite.Factory()) using (var brush = new D2D.SolidColorBrush(target, new Color(0xff, 0xff, 0xff, 0x7f))) { target.BeginDraw(); { target.DrawBitmap(bmpPicture, new RectangleF(0, 0, target.Size.Width, target.Size.Height), 1.0f, D2D.BitmapInterpolationMode.Linear); target.DrawRectangle(new RectangleF(0, 0, target.Size.Width, target.Size.Height), brush); var textFormat = new DWrite.TextFormat(dwriteFactory, "微軟雅黑", DWrite.FontWeight.Bold, DWrite.FontStyle.Normal, 30.0f); target.DrawText(watermarkText, textFormat, new RectangleF(target.Size.Width - 130, target.Size.Height - 50, int.MaxValue, int.MaxValue), brush); } target.EndDraw(); var ms = new MemoryStream(); SaveD2DBitmap(wic, wicBitmap, ms); return ms; } } void SaveD2DBitmap(WIC.ImagingFactory wicFactory, WIC.Bitmap wicBitmap, Stream outputStream) { using (var encoder = new WIC.BitmapEncoder(wicFactory, WIC.ContainerFormatGuids.Png)) { encoder.Initialize(outputStream); using (var frame = new WIC.BitmapFrameEncode(encoder)) { frame.Initialize(); frame.SetSize(wicBitmap.Size.Width, wicBitmap.Size.Height); var pixelFormat = wicBitmap.PixelFormat; frame.SetPixelFormat(ref pixelFormat); frame.WriteSource(wicBitmap); frame.Commit(); encoder.Commit(); } } } WIC.FormatConverter CreateWicImage(WIC.ImagingFactory wicFactory, Stream stream) { using (var decoder = new WIC.PngBitmapDecoder(wicFactory)) { var decodeStream = new WIC.WICStream(wicFactory, stream); decoder.Initialize(decodeStream, WIC.DecodeOptions.CacheOnLoad); using (var decodeFrame = decoder.GetFrame(0)) { var converter = new WIC.FormatConverter(wicFactory); converter.Initialize(decodeFrame, WIC.PixelFormat.Format32bppPBGRA); return converter; } } }
調(diào)用方式:
File.WriteAllBytes(@"D:\_\Demo2.png", AddWatermark(File.OpenRead(@"D:\_\WatermarkDemo.png"), "水印在此").ToArray());
效果也是一切正常:
有什么區(qū)別?
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