mirror of
https://github.com/ElectronNET/Electron.NET.git
synced 2026-02-11 05:34:34 +00:00
454 lines
14 KiB
C#
454 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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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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using System.Linq;
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using System.Text.RegularExpressions;
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using Newtonsoft.Json;
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namespace ElectronNET.API.Entities
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{
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/// <summary>
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/// Native Image handler for Electron.NET
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/// </summary>
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[JsonConverter(typeof(NativeImageJsonConverter))]
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public class NativeImage
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{
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private readonly Dictionary<float, Image> _images = new Dictionary<float, Image>();
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private bool _isTemplateImage;
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private static readonly Dictionary<string, float> ScaleFactorPairs = new Dictionary<string, float>
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{
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{"@2x", 2.0f}, {"@3x", 3.0f}, {"@1x", 1.0f}, {"@4x", 4.0f},
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{"@5x", 5.0f}, {"@1.25x", 1.25f}, {"@1.33x", 1.33f}, {"@1.4x", 1.4f},
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{"@1.5x", 1.5f}, {"@1.8x", 1.8f}, {"@2.5x", 2.5f}
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};
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private static float? ExtractDpiFromFilePath(string filePath)
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{
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var withoutExtension = Path.GetFileNameWithoutExtension(filePath);
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return ScaleFactorPairs
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.Where(p => withoutExtension.EndsWith(p.Key))
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.Select(p => p.Value)
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.FirstOrDefault();
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}
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private static Image BytesToImage(byte[] bytes)
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{
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var ms = new MemoryStream(bytes);
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return Image.FromStream(ms);
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}
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/// <summary>
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/// Creates an empty NativeImage
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/// </summary>
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public static NativeImage CreateEmpty()
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{
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return new NativeImage();
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}
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/// <summary>
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///
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/// </summary>
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public static NativeImage CreateFromBitmap(Bitmap bitmap, CreateFromBitmapOptions options = null)
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{
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if (options is null)
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{
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options = new CreateFromBitmapOptions();
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}
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return new NativeImage(bitmap, options.ScaleFactor);
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}
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/// <summary>
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/// Creates a NativeImage from a byte array.
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/// </summary>
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public static NativeImage CreateFromBuffer(byte[] buffer, CreateFromBufferOptions options = null)
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{
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if (options is null)
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{
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options = new CreateFromBufferOptions();
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}
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var ms = new MemoryStream(buffer);
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var image = Image.FromStream(ms);
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return new NativeImage(image, options.ScaleFactor);
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}
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/// <summary>
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/// Creates a NativeImage from a base64 encoded data URL.
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/// </summary>
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/// <param name="dataUrl">A data URL with a base64 encoded image.</param>
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public static NativeImage CreateFromDataURL(string dataUrl)
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{
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var images = new Dictionary<float,Image>();
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var parsedDataUrl = Regex.Match(dataUrl, @"data:image/(?<type>.+?),(?<data>.+)");
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var actualData = parsedDataUrl.Groups["data"].Value;
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var binData = Convert.FromBase64String(actualData);
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var image = BytesToImage(binData);
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images.Add(1.0f, image);
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return new NativeImage(images);
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}
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/// <summary>
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/// Creates a NativeImage from an image on the disk.
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/// </summary>
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/// <param name="path">The path of the image</param>
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public static NativeImage CreateFromPath(string path)
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{
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var images = new Dictionary<float,Image>();
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if (Regex.IsMatch(path, "(@.+?x)"))
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{
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var dpi = ExtractDpiFromFilePath(path);
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if (dpi == null)
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{
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throw new Exception($"Invalid scaling factor for '{path}'.");
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}
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images[dpi.Value] = Image.FromFile(path);
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}
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else
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{
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var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(path);
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var extension = Path.GetExtension(path);
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// Load as 1x dpi
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images[1.0f] = Image.FromFile(path);
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foreach (var scale in ScaleFactorPairs)
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{
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var fileName = $"{fileNameWithoutExtension}{scale}.{extension}";
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if (File.Exists(fileName))
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{
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var dpi = ExtractDpiFromFilePath(fileName);
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if (dpi != null)
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{
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images[dpi.Value] = Image.FromFile(fileName);
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}
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}
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}
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}
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return new NativeImage(images);
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}
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/// <summary>
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/// Creates an empty NativeImage
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/// </summary>
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public NativeImage()
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{
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}
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/// <summary>
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/// Creates a NativeImage from a bitmap and scale factor
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/// </summary>
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public NativeImage(Image bitmap, float scaleFactor = 1.0f)
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{
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_images.Add(scaleFactor, bitmap);
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}
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/// <summary>
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/// Creates a NativeImage from a dictionary of scales and images.
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/// </summary>
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public NativeImage(Dictionary<float, Image> imageDictionary)
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{
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_images = imageDictionary;
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}
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/// <summary>
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/// Crops the image specified by the input rectangle and computes scale factor
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/// </summary>
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public NativeImage Crop(Rectangle rect)
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{
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var images = new Dictionary<float,Image>();
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foreach (var image in _images)
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{
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images.Add(image.Key, Crop(rect.X, rect.Y, rect.Width, rect.Height, image.Key));
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}
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return new NativeImage(images);
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}
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/// <summary>
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/// Resizes the image and computes scale factor
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/// </summary>
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public NativeImage Resize(ResizeOptions options)
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{
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var images = new Dictionary<float, Image>();
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foreach (var image in _images)
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{
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images.Add(image.Key, Resize(options.Width, options.Height, image.Key));
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}
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return new NativeImage(images);
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}
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/// <summary>
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/// Add an image representation for a specific scale factor.
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/// </summary>
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/// <param name="options"></param>
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public void AddRepresentation(AddRepresentationOptions options)
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{
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if (options.Buffer.Length > 0)
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{
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_images[options.ScaleFactor] =
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CreateFromBuffer(options.Buffer, new CreateFromBufferOptions {ScaleFactor = options.ScaleFactor})
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.GetScale(options.ScaleFactor);
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}
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else if (!string.IsNullOrEmpty(options.DataUrl))
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{
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_images[options.ScaleFactor] = CreateFromDataURL(options.DataUrl).GetScale(options.ScaleFactor);
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}
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}
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/// <summary>
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/// Gets the aspect ratio for the image based on scale factor
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/// </summary>
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/// <param name="scaleFactor">Optional</param>
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public float GetAspectRatio(float scaleFactor = 1.0f)
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{
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var image = GetScale(scaleFactor);
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if (image != null)
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{
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return image.Width / image.Height;
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}
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return 0f;
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}
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/// <summary>
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/// Returns a byte array that contains the image's raw bitmap pixel data.
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/// </summary>
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public byte[] GetBitmap(BitmapOptions options)
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{
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return ToBitmap(new ToBitmapOptions{ ScaleFactor = options.ScaleFactor });
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}
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/// <summary>
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/// Returns a byte array that contains the image's raw bitmap pixel data.
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/// </summary>
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public byte[] GetNativeHandle()
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{
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return ToBitmap(new ToBitmapOptions());
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}
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/// <summary>
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/// Gets the size of the specified image based on scale factor
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/// </summary>
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public Size GetSize(float scaleFactor = 1.0f)
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{
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if (_images.ContainsKey(scaleFactor))
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{
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var image = _images[scaleFactor];
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return new Size
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{
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Width = image.Width,
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Height = image.Height
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};
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}
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return null;
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}
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/// <summary>
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/// Checks to see if the NativeImage instance is empty.
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/// </summary>
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public bool IsEmpty()
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{
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return _images.Count <= 0;
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}
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/// <summary>
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/// Deprecated. Whether the image is a template image.
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/// </summary>
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public bool IsTemplateImage => _isTemplateImage;
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/// <summary>
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/// Deprecated. Marks the image as a template image.
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/// </summary>
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public void SetTemplateImage(bool option)
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{
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_isTemplateImage = option;
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}
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/// <summary>
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/// Outputs a bitmap based on the scale factor
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/// </summary>
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public byte[] ToBitmap(ToBitmapOptions options)
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{
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return ImageToBytes(ImageFormat.Bmp, options.ScaleFactor);
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}
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/// <summary>
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/// Outputs a data URL based on the scale factor
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/// </summary>
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public string ToDataURL(ToDataUrlOptions options)
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{
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if (!_images.ContainsKey(options.ScaleFactor))
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{
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return null;
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}
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var image = _images[options.ScaleFactor];
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var mimeType = ImageCodecInfo.GetImageEncoders().FirstOrDefault(x => x.FormatID == image.RawFormat.Guid)?.MimeType;
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if (mimeType is null)
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{
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mimeType = "image/png";
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}
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var bytes = ImageToBytes(image.RawFormat, options.ScaleFactor);
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var base64 = Convert.ToBase64String(bytes);
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return $"data:{mimeType};base64,{base64}";
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}
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/// <summary>
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/// Outputs a JPEG for the default scale factor
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/// </summary>
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public byte[] ToJPEG(int quality)
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{
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return ImageToBytes(ImageFormat.Jpeg, 1.0f, quality);
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}
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/// <summary>
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/// Outputs a PNG for the specified scale factor
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/// </summary>
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public byte[] ToPNG(ToPNGOptions options)
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{
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return ImageToBytes(ImageFormat.Png, options.ScaleFactor);
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}
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private byte[] ImageToBytes(ImageFormat imageFormat = null, float scaleFactor = 1.0f, int quality = 100)
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{
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using var ms = new MemoryStream();
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if (_images.ContainsKey(scaleFactor))
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{
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var image = _images[scaleFactor];
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var encoderCodecInfo = GetEncoder(imageFormat ?? image.RawFormat);
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var encoder = Encoder.Quality;
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var encoderParameters = new EncoderParameters(1)
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{
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Param = new[]
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{
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new EncoderParameter(encoder, quality)
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}
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};
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image.Save(ms, encoderCodecInfo, encoderParameters);
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return ms.ToArray();
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}
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return null;
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}
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private Image Resize(int? width, int? height, float scaleFactor = 1.0f)
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{
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if (!_images.ContainsKey(scaleFactor) || (width is null && height is null))
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{
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return null;
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}
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var image = _images[scaleFactor];
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using (var g = Graphics.FromImage(image))
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{
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g.CompositingQuality = CompositingQuality.HighQuality;
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var aspect = GetAspectRatio(scaleFactor);
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width ??= Convert.ToInt32(image.Width * aspect);
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height ??= Convert.ToInt32(image.Height * aspect);
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width = Convert.ToInt32(width * scaleFactor);
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height = Convert.ToInt32(height * scaleFactor);
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var bmp = new Bitmap(width.Value, height.Value);
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g.DrawImage(bmp,
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new System.Drawing.Rectangle(0, 0, image.Width, image.Height),
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new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height),
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GraphicsUnit.Pixel);
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return bmp;
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}
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}
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private Image Crop(int? x, int? y, int? width, int? height, float scaleFactor = 1.0f)
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{
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if (!_images.ContainsKey(scaleFactor))
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{
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return null;
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}
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var image = _images[scaleFactor];
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using (var g = Graphics.FromImage(image))
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{
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g.CompositingQuality = CompositingQuality.HighQuality;
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x ??= 0;
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y ??= 0;
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x = Convert.ToInt32(x * scaleFactor);
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y = Convert.ToInt32(y * scaleFactor);
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width ??= image.Width;
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height ??= image.Height;
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width = Convert.ToInt32(width * scaleFactor);
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height = Convert.ToInt32(height * scaleFactor);
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var bmp = new Bitmap(width.Value, height.Value);
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g.DrawImage(bmp, new System.Drawing.Rectangle(0, 0, image.Width, image.Height), new System.Drawing.Rectangle(x.Value, y.Value, width.Value, height.Value), GraphicsUnit.Pixel);
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return bmp;
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}
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}
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private ImageCodecInfo GetEncoder(ImageFormat format)
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{
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var codecs = ImageCodecInfo.GetImageDecoders();
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foreach (ImageCodecInfo codec in codecs)
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{
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if (codec.FormatID == format.Guid)
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{
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return codec;
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}
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}
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return null;
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}
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internal Dictionary<float,string> GetAllScaledImages()
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{
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var dict = new Dictionary<float,string>();
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try
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{
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foreach (var (scale, image) in _images)
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{
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dict.Add(scale, Convert.ToBase64String(ImageToBytes(null, scale)));
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}
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}
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catch (Exception ex)
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{
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BridgeConnector.LogError(ex, "Error getting scaled images");
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}
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return dict;
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}
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internal Image GetScale(float scaleFactor)
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{
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if (_images.ContainsKey(scaleFactor))
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{
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return _images[scaleFactor];
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}
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return null;
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}
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}
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}
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