115 lines
4.3 KiB
C#
115 lines
4.3 KiB
C#
using UnityEngine;
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using System.IO;
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using BitMiracle.LibTiff.Classic;
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public class TiffFileConverterWithLibrary : MonoBehaviour
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{
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public string pngPath;
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public string tiffPath;
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[ContextMenu("ConvertPngFileToTiff")]
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void PNG()
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{
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ConvertPngFileToTiff(pngPath, tiffPath);
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}
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/// <summary>
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/// 从文件路径加载 PNG，并使用 LibTiff.Net 将其转换为 TIFF 文件。
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/// </summary>
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/// <param name="pngFilePath">源 PNG 文件的完整路径。</param>
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/// <param name="outputTiffPath">目标 TIFF 文件的输出路径。</param>
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public static void ConvertPngFileToTiff(string pngFilePath, string outputTiffPath)
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{
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if (!File.Exists(pngFilePath))
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{
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Debug.LogError($"Source PNG file not found at: {pngFilePath}");
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return;
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}
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// 步骤 1: 读取 PNG 文件数据并加载到 Texture2D
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byte[] fileData = File.ReadAllBytes(pngFilePath);
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// 创建一个临时的 Texture2D。尺寸无关紧要，LoadImage 会自动调整。
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Texture2D pngTexture = new Texture2D(2, 2);
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// LoadImage 会自动解码 PNG 数据并填充 Texture2D
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if (!pngTexture.LoadImage(fileData))
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{
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Debug.LogError("Failed to load PNG data into Texture2D.");
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return;
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}
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// 步骤 2: 从 Texture2D 提取像素数据并使用 LibTiff.Net 写入 TIFF 文件
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int width = pngTexture.width;
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int height = pngTexture.height;
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try
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{
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using (Tiff tiff = Tiff.Open(outputTiffPath, "w"))
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{
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if (tiff == null)
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{
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Debug.LogError("Could not open TIFF file for writing.");
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return;
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}
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tiff.SetField(TiffTag.IMAGEWIDTH, width);
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tiff.SetField(TiffTag.IMAGELENGTH, height);
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tiff.SetField(TiffTag.SAMPLESPERPIXEL, 4); // RGBA
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tiff.SetField(TiffTag.BITSPERSAMPLE, 8);
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tiff.SetField(TiffTag.ORIENTATION, Orientation.TOPLEFT);
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tiff.SetField(TiffTag.ROWSPERSTRIP, height);
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tiff.SetField(TiffTag.XRESOLUTION, 88.0);
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tiff.SetField(TiffTag.YRESOLUTION, 88.0);
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tiff.SetField(TiffTag.RESOLUTIONUNIT, ResUnit.INCH);
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tiff.SetField(TiffTag.PLANARCONFIG, PlanarConfig.CONTIG);
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tiff.SetField(TiffTag.PHOTOMETRIC, Photometric.RGB);
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tiff.SetField(TiffTag.COMPRESSION, Compression.LZW);
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Color32[] pixels = pngTexture.GetPixels32();
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byte[] raster = new byte[width * height * 4];
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// LibTiff 需要的像素顺序可能与 Unity 不同，需要垂直翻转
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for (int y = 0; y < height; y++)
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{
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for (int x = 0; x < width; x++)
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{
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Color32 pixel = pixels[(height - 1 - y) * width + x];
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int index = (y * width + x) * 4;
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raster[index] = pixel.r;
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raster[index + 1] = pixel.g;
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raster[index + 2] = pixel.b;
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raster[index + 3] = pixel.a;
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}
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}
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tiff.WriteEncodedStrip(0, raster, raster.Length);
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tiff.Close();
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Debug.Log($"Successfully converted file '{pngFilePath}' to '{outputTiffPath}' using LibTiff.Net");
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}
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}
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catch (System.Exception ex)
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{
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Debug.LogError($"Failed to convert PNG file to TIFF using LibTiff.Net: {ex.Message}");
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}
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finally
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{
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// 销毁临时的 Texture2D 对象以释放内存
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Object.Destroy(pngTexture);
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}
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}
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// 示例用法
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void Start()
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{
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return;
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string sourcePngPath = Path.Combine(Application.streamingAssetsPath, "YourImage.png");
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string destinationTiffPath = Path.Combine(Application.persistentDataPath, "output_from_file_libtiff.tif");
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#if UNITY_EDITOR || UNITY_STANDALONE
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ConvertPngFileToTiff(sourcePngPath, destinationTiffPath);
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#else
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Debug.LogWarning("Direct file access to StreamingAssets might not work on this platform.");
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#endif
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}
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} |