132 lines
4.7 KiB
C#
132 lines
4.7 KiB
C#
namespace Zenith
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{
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using System;
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using System.IO;
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Metadata;
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using UnityEngine;
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public static class ImageDpiProcessor
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{
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/// <summary>
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/// 修改现有图片文件的DPI
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/// </summary>
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/// <param name="inputPath">原始图片路径</param>
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/// <param name="outputPath">输出图片路径（可与输入路径相同，覆盖原文件）</param>
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/// <param name="dpi">目标DPI值（水平和垂直方向将使用相同值）</param>
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/// <returns>是否成功</returns>
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public static bool ModifyImageDpi(string inputPath, string outputPath, int dpi)
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{
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try
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{
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// 验证输入文件
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if (!File.Exists(inputPath))
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{
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Debug.LogError($"文件不存在: {inputPath}");
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return false;
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}
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// 确保DPI值有效
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if (dpi <= 0)
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{
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Debug.LogError("DPI值必须大于0");
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return false;
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}
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// 加载图片并修改DPI
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using (var image = Image.Load(inputPath))
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{
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// 设置分辨率单位为英寸（DPI的标准单位）
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image.Metadata.ResolutionUnits = PixelResolutionUnit.PixelsPerInch;
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// 设置水平和垂直DPI
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image.Metadata.HorizontalResolution = dpi;
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image.Metadata.VerticalResolution = dpi;
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// 确保输出目录存在
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string outputDirectory = Path.GetDirectoryName(outputPath);
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if (!Directory.Exists(outputDirectory))
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{
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Directory.CreateDirectory(outputDirectory);
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}
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// 保存修改后的图片（自动保留原格式）
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image.Save(outputPath);
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}
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Debug.Log($"成功将图片DPI修改为 {dpi}: {outputPath}");
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return true;
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}
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catch (Exception ex)
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{
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Debug.LogError($"修改DPI失败: {ex.Message}");
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return false;
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}
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}
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/// <summary>
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/// 将Unity的Texture2D保存为指定DPI的图片
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/// </summary>
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/// <param name="texture">Unity纹理</param>
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/// <param name="savePath">保存路径（需包含文件名和扩展名，如.png）</param>
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/// <param name="dpi">目标DPI值</param>
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/// <returns>是否成功</returns>
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public static bool SaveTextureWithDpi(Texture2D texture, string savePath, int dpi)
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{
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try
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{
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if (texture == null)
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{
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Debug.LogError("Texture2D不能为空");
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return false;
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}
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// 从Texture2D获取图片字节数据（根据保存格式选择编码方式）
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byte[] imageData;
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string extension = Path.GetExtension(savePath).ToLower();
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if (extension == ".png")
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{
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imageData = texture.EncodeToPNG();
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}
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else if (extension == ".jpg" || extension == ".jpeg")
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{
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imageData = texture.EncodeToJPG(90); // 90%质量
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}
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else
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{
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Debug.LogError("不支持的图片格式，仅支持PNG和JPG");
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return false;
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}
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// 使用内存流处理图片数据
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using (var memoryStream = new MemoryStream(imageData))
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using (var image = Image.Load(memoryStream))
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{
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// 设置DPI元数据
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image.Metadata.ResolutionUnits = PixelResolutionUnit.PixelsPerInch;
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image.Metadata.HorizontalResolution = dpi;
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image.Metadata.VerticalResolution = dpi;
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// 确保保存目录存在
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string directory = Path.GetDirectoryName(savePath);
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if (!Directory.Exists(directory))
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{
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Directory.CreateDirectory(directory);
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}
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// 保存图片
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image.Save(savePath);
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}
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Debug.Log($"Texture2D已保存为 {dpi} DPI: {savePath}");
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return true;
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}
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catch (Exception ex)
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{
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Debug.LogError($"保存带DPI的图片失败: {ex.Message}");
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return false;
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}
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}
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}
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} |