Elivo
2 months ago
3 changed files with 227 additions and 102 deletions
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#if DRAWING
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using System; |
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using System.Drawing; |
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using System.Drawing.Drawing2D; |
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using System.Drawing.Imaging; |
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using System.IO; |
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namespace Apewer |
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{ |
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/// <summary>绘图。</summary>
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public static class DrawingUtility |
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{ |
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/// <summary>优化 Graphics 对象的属性，提升绘图质量。</summary>
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public static Graphics Optimize(this Graphics graphics) |
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{ |
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if (graphics != null) |
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{ |
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graphics.CompositingMode = CompositingMode.SourceOver; |
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graphics.CompositingQuality = CompositingQuality.HighQuality; |
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graphics.SmoothingMode = SmoothingMode.AntiAlias; |
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} |
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return graphics; |
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} |
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/// <summary>保存图像为文件。</summary>
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/// <exception cref="ArgumentNullException"></exception>
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public static byte[] Save(this Image image, ImageFormat format) |
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{ |
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if (image == null) throw new ArgumentNullException(nameof(image)); |
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if (format == null) throw new ArgumentNullException(nameof(format)); |
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using (var memory = new MemoryStream()) |
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{ |
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image.Save(memory, format); |
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return memory.ToArray(); |
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} |
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} |
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/// <summary>保存为 JPEG 文件。</summary>
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/// <param name="image">Image 实例。</param>
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/// <param name="quality">JPEG 质量，0 为最低质量，100 为最高质量。</param>
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/// <exception cref="ArgumentNullException" />
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/// <exception cref="ArgumentOutOfRangeException" />
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/// <exception cref="System.Runtime.InteropServices.ExternalException" />
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public static byte[] SaveAsJpeg(this Image image, int quality = 100) |
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{ |
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if (image == null) throw new ArgumentNullException(nameof(image)); |
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if (quality < 0 || quality > 100) throw new ArgumentOutOfRangeException(nameof(quality)); |
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var codec = ImageCodecInfo.GetImageDecoders().Find(x => x.FormatID == ImageFormat.Jpeg.Guid); |
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if (codec == null) throw new System.Runtime.InteropServices.ExternalException($"系统中不存在 JPEG 编码器。"); |
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var parameters = new EncoderParameters(1); |
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parameters.Param[0] = new EncoderParameter(Encoder.Quality, quality); |
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using (var memory = new MemoryStream()) |
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{ |
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image.Save(memory, codec, parameters); |
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return memory.ToArray(); |
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} |
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} |
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/// <summary>缩放图像，生成新图像。</summary>
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/// <param name="image">原始图像。</param>
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/// <param name="size">新图像的大小。</param>
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/// <param name="backgroundColor">填充新图像背景色。</param>
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/// <exception cref="ArgumentNullException"></exception>
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/// <exception cref="ArgumentOutOfRangeException"></exception>
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public static Bitmap Scale(this Image image, Size size, Color? backgroundColor = null) => Scale(image, size.Width, size.Height, backgroundColor); |
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/// <summary>缩放图像，生成新图像。</summary>
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/// <param name="image">原始图像。</param>
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/// <param name="width">新图像的宽度。</param>
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/// <param name="height">新图像的高度。</param>
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/// <param name="backgroundColor">填充新图像背景色。</param>
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/// <exception cref="ArgumentNullException"></exception>
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/// <exception cref="ArgumentOutOfRangeException"></exception>
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static Bitmap Scale(this Image image, int width, int height, Color? backgroundColor = null) |
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{ |
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if (image == null) throw new ArgumentNullException(nameof(image)); |
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if (width < 1) throw new ArgumentOutOfRangeException(nameof(width)); |
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if (height < 1) throw new ArgumentOutOfRangeException(nameof(height)); |
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// 检查原始图像是否为透明格式
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var rawFormat = image.RawFormat; |
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var isTransparentFormat = rawFormat.Equals(ImageFormat.Png) || rawFormat.Equals(ImageFormat.Gif); |
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var pixelFormat = isTransparentFormat ? PixelFormat.Format32bppArgb : PixelFormat.Format24bppRgb; |
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var bitmap = new Bitmap(width, height, pixelFormat); |
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try |
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{ |
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using (var graphic = Graphics.FromImage(bitmap)) |
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{ |
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graphic.CompositingMode = CompositingMode.SourceOver; |
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graphic.CompositingQuality = CompositingQuality.HighQuality; |
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graphic.SmoothingMode = SmoothingMode.AntiAlias; |
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// 填充背景色
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if (isTransparentFormat) |
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{ |
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if (backgroundColor != null && backgroundColor.HasValue) graphic.Clear(backgroundColor.Value); |
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} |
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// 绘制新图像
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graphic.DrawImage(image, 0, 0, width, height); |
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} |
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return bitmap; |
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} |
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catch |
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{ |
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bitmap.Dispose(); |
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throw; |
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} |
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} |
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} |
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} |
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#endif
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