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116 lines
4.0 KiB
116 lines
4.0 KiB
#if NET40 || NET461
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using Apewer;
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using Apewer.Internals;
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using Apewer.Internals.QrCode;
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using Apewer.Models;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Text;
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namespace Apewer.Surface
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{
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/// <summary>图像实用工具。</summary>
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public sealed class ImageUtility
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{
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internal static byte[] EmptyBytes { get { return new byte[0]; } }
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/// <summary>保存图像到文件,失败时返回 NULL 值。</summary>
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public static byte[] SaveAsBytes(Image image, ImageFormat format, bool dispose = false)
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{
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if (image == null) return EmptyBytes;
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var memory = new MemoryStream();
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var bytes = null as byte[];
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try
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{
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image.Save(memory, format);
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bytes = memory.ToArray();
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}
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catch { }
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memory.Dispose();
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if (dispose) image.Dispose();
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return bytes;
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}
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/// <summary>保存为 PNG 文件,失败时返回 NULL 值。</summary>
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public static byte[] SaveAsPng(Image image, bool dispose = false)
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{
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return SaveAsBytes(image, ImageFormat.Png, dispose);
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}
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/// <summary>保存为 JPEG 文件,失败时返回 NULL 值。</summary>
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public static byte[] SaveAsJpeg(Image image, bool dispose = false)
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{
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return SaveAsBytes(image, ImageFormat.Jpeg, dispose);
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}
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/// <summary>生成二维码图像,可指定色块边长像素值和纠错率,失败时返回 NULL 值。</summary>
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public static Bitmap GenerateQrCode(string text, int block = 8)
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{
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return GenerateQrCode(text, block, Color.Black, Color.White);
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}
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/// <summary>生成二维码图像,可指定色块边长像素值和纠错率,失败时返回 NULL 值。</summary>
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public static Bitmap GenerateQrCode(string text, int block, Color dark, Color light)
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{
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var t = text ?? "";
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var b = block > 1 ? block : 1;
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var ecclevel = QRCodeGenerator.ECCLevel.M;
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// var ecc = QrCodeEccLevel.M;
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// if (ecc == QrCodeEccLevel.L) ecclevel = QRCodeGenerator.ECCLevel.L;
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// else if (ecc == QrCodeEccLevel.M) ecclevel = QRCodeGenerator.ECCLevel.M;
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// else if (ecc == QrCodeEccLevel.Q) ecclevel = QRCodeGenerator.ECCLevel.Q;
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// else if (ecc == QrCodeEccLevel.H) ecclevel = QRCodeGenerator.ECCLevel.H;
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try
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{
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var generator = new QRCodeGenerator();
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var content = generator.CreateQrCode(t, ecclevel);
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var qrcode = new QRCode(content);
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var bitmap = qrcode.GetGraphic(b, dark, light, false);
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return bitmap;
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}
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catch { return null; }
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}
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/// <summary>从 RGBA 十六进制字符串获取颜色。</summary>
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public static Color GetColorByHex(string hex, Color @default)
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{
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var lower = hex.ToLower();
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if (lower == "none" || lower == "alpha" || lower == "transparent")
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{
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return Color.Transparent;
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}
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else
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{
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const string pool = Constant.HexCollection;
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lower = TextUtility.RestrictCharacters(lower, pool);
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if (lower.Length >= 6)
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{
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var r = pool.IndexOf(lower[0]) * 16 + pool.IndexOf(lower[1]);
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var g = pool.IndexOf(lower[2]) * 16 + pool.IndexOf(lower[3]);
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var b = pool.IndexOf(lower[4]) * 16 + pool.IndexOf(lower[5]);
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var a = 255;
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if (lower.Length >= 8)
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{
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a = pool.IndexOf(lower[6]) * 16 + pool.IndexOf(lower[7]);
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}
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var color = Color.FromArgb(a, r, g, b);
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return color;
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}
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}
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return @default;
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}
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}
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}
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#endif
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