add: 字体取模预览和导出数据

Image2Display/Image2Display/Assets/Languages/en-US.axaml

@@ -193,6 +193,7 @@
     <system:String x:Key="CopyToClipboardText">Copy to Clipboard</system:String>
     <system:String x:Key="ExportFileText">Export File</system:String>
     <system:String x:Key="TotalCharacters">Total Characters</system:String>
+    <system:String x:Key="LoadFontFileFail">Fail to load font file, format error.</system:String>
 
     <system:String x:Key="Settings">Settings</system:String>
     <system:String x:Key="General">General</system:String>

Image2Display/Image2Display/Assets/Languages/zh-CN.axaml

@@ -132,7 +132,7 @@
     <system:String x:Key="LSB">最低有效位（LSB）</system:String>
     <system:String x:Key="SuccessTitle">成功</system:String>
     <system:String x:Key="SuccessMessage">数据已导出。</system:String>
-    <system:String x:Key="FailTitle">导出失败</system:String>
+    <system:String x:Key="FailTitle">失败</system:String>
     <system:String x:Key="ExportPalette">导出调色板</system:String>
     <system:String x:Key="ExportPaletteDescription">导出当前图片所使用的所有颜色</system:String>
     <system:String x:Key="ExportData">导出数据</system:String>
@@ -196,6 +196,7 @@
     <system:String x:Key="CopyToClipboardText">复制到剪贴板</system:String>
     <system:String x:Key="ExportFileText">导出文件</system:String>
     <system:String x:Key="TotalCharacters">总字符数量</system:String>
+    <system:String x:Key="LoadFontFileFail">字体文件加载失败，文件格式不正确。</system:String>
 
     <!--  设置页  -->
     <system:String x:Key="Settings">设置</system:String>

Image2Display/Image2Display/Helpers/DemoFontData.cs

@@ -8,6 +8,10 @@ namespace Image2Display.Helpers;
 
 public class DemoFontData
 {
+    public static byte[] Default
+    {
+        get => ZiSymbol;
+    }
     public static readonly byte[] ZiSymbol = [
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x4B,0x48,0x06,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x88,0xFF,0xA2,0x00,

Image2Display/Image2Display/Helpers/FontConvert.cs

@@ -1,7 +1,10 @@
 using Image2Display.Models;
+using SixLabors.ImageSharp;
 using SixLabors.ImageSharp.PixelFormats;
+using SkiaSharp;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -18,7 +21,7 @@ public class FontConvert
     /// <param name="height">像素宽度</param>
     /// <param name="image">图片缓冲区，没给的话会新建一个</param>
     /// <returns>图片缓冲</returns>
-    public static ImageData GetImage(byte[] data, int width, int height,ImageData? image = null)
+    public static ImageData GetImage(byte[] data, int width, int height, ImageData? image = null)
     {
         //像素尺寸
         var pixelSize = 8;
@@ -65,5 +68,224 @@ public static ImageData GetImage(byte[] data, int width, int height,ImageData? i
         return image;
     }
 
+    public static byte[] GetData(SKTypeface font, int size, char c, int width, int height, int offsetx, int offsety)
+    {
+        //创建画布
+        using var surface = SKSurface.Create(new SKImageInfo(width, height));
+        //创建画笔
+        using var paint = new SKPaint
+        {
+            Color = SKColors.White,
+            TextSize = size,
+            Typeface = font,
+            TextAlign = SKTextAlign.Center,
+            IsAntialias = true,
+        };
+        //画布上画字
+        surface.Canvas.DrawText(c.ToString(), width/2 + offsetx, height - offsety, paint);
+        //获取像素数据
+        IntPtr data = surface.PeekPixels().GetPixels();
+        var result = new byte[width * height];
+
+        // 获取像素数据
+        using var pixmap = surface.PeekPixels();
+        if (pixmap != null)
+        {
+            // 遍历像素数据
+            for (int y = 0; y < pixmap.Height; y++)
+            {
+                for (int x = 0; x < pixmap.Width; x++)
+                {
+                    IntPtr pixel = pixmap.GetPixels(x, y);
+                    var buff = new byte[pixmap.BytesPerPixel];
+                    System.Runtime.InteropServices.Marshal.Copy(pixel, buff, 0, buff.Length);
+                    result[x + y * width] = buff[0];
+                }
+            }
+        }
+
+        return result;
+    }
+
+    /// <summary>
+    /// 数据二值化处理（仅用于预览）
+    /// </summary>
+    public static void ThresholdImage(byte[] data,  byte threshold)
+    {
+        for (int i = 0; i < data.Length; i++)
+        {
+            data[i] = data[i] > threshold ? (byte)255 : (byte)0;
+        }
+    }
+
+    /// <summary>
+    /// 图片转换为特定灰度的图片（仅用于预览）
+    /// </summary>
+    public static void GrayScaleImage(byte[] data, int bit)
+    {
+        for (int i = 0; i < data.Length; i++)
+        {
+            //这个灰度位数，有多少种颜色
+            var number = 1 << bit;
+            //每个颜色的间隔
+            var interval = 255 / (number - 1);
+            //把每个格子的灰度对齐到最近的颜色
+            data[i] = (byte)((data[i] / interval) * interval);
+        }
+    }
+
+    /// <summary>
+    /// 反转图像颜色（仅用于预览）
+    /// </summary>
+    public static void InvertImage(byte[] data)
+    {
+        for (int i = 0; i < data.Length; i++)
+        {
+            data[i] = (byte)(255 - data[i]);
+        }
+    }
+
+    private static void IteratePixel(byte[] data, int rotate, int width, int height, Action<byte> action)
+    {
+        //主要开始1 主要结束1 次要开始2 次要结束2 是否先x后y
+        var (m1, m2, p1, p2, xFirst) = rotate switch
+        {
+            0 => (0, width - 1, 0, height - 1, true),
+            1 => (width - 1, 0, 0, height - 1, true),
+            2 => (0, width - 1, height - 1, 0, true),
+            3 => (width - 1, 0, height - 1, 0, true),
+            4 => (0, height - 1, 0, width - 1, false),
+            5 => (height - 1, 0, 0, width - 1, false),
+            6 => (0, height - 1, width - 1, 0, false),
+            7 => (height - 1, 0, width - 1, 0, false),
+            _ => throw new NotImplementedException(),
+        };
+
+        var mStep = m1 < m2 ? 1 : -1;
+        var pStep = p1 < p2 ? 1 : -1;
+        if (xFirst)
+        {
+            for (var y = p1; y != p2 + pStep; y += pStep)
+            {
+                for (var x = m1; x != m2 + mStep; x += mStep)
+                {
+                    action(data[x + y * width]);
+                }
+            }
+        }
+        else
+        {
+            for (var x = p1; x != p2 + pStep; x += pStep)
+            {
+                for (var y = m1; y != m2 + mStep; y += mStep)
+                {
+                    action(data[x + y * width]);
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// 获取处理后的数据
+    /// </summary>
+    /// <returns></returns>
+    public static List<byte> GetResultData(
+        byte[] raw, int width, int height,
+        bool isGray, int bit, byte threshold,
+        bool isInvert, int byteOrder, bool bitOrderMSB)
+    {
+        //先取反
+        if(isInvert)
+            InvertImage(raw);
+
+        var bitLength = 1;
+        if (isGray)
+            bitLength = bit;
+
+        var result = new List<byte>();
+        int bitIndex = 0;
+        byte lastByte = 0;
+        //按像素顺序遍历
+        IteratePixel(raw, byteOrder, width, height, (b) =>
+        {
+            if(isGray)
+            {
+                //灰度处理
+                b = (byte)(b >> (8 - bitLength));
+            }
+            else
+            {
+                //二值化处理
+                b = b > threshold ? (byte)1 : (byte)0;
+            }
+            //反向数据
+            if (!bitOrderMSB)
+            {
+                var temp = (byte)0;
+                for (int i = 0; i < bitLength; i++)
+                {
+                    temp <<= 1;
+                    temp |= (byte)(b & 1);
+                    b >>= 1;
+                }
+                b = temp;
+            }
+            //添加到结果
+            lastByte <<= bitLength;
+            lastByte |= b;
+            bitIndex += bitLength;
+            if (bitIndex >= 8)
+            {
+                result.Add(lastByte);
+                lastByte = 0;
+                bitIndex = 0;
+            }
+        });
+        //最后一个字节
+        if (bitIndex > 0)
+        {
+            lastByte <<= 8 - bitIndex;
+            result.Add(lastByte);
+        }
+        return result;
+    }
 
+
+    /// <summary>
+    /// 将字体数据转换为C数组
+    /// </summary>
+    /// <param name="data">数据，每个字一个数组</param>
+    /// <param name="width">字库宽度</param>
+    /// <param name="height">字库高度</param>
+    /// <param name="charset">实际用的字符集</param>
+    /// <returns></returns>
+    public static string ByteListToCArray(List<List<byte>> data, int width, int height, IList<char> charset)
+    {
+        var sb = new StringBuilder();
+        if (Utils.Settings.Language.Contains("ZH", StringComparison.CurrentCultureIgnoreCase))
+            sb.Append("/*@注意：此文件由Image2Display生成 */\n");
+        else
+            sb.Append("/*@Notice: This file is generated by Image2Display */\n");
+        if (data.Count == 0 || data[0].Count == 0 || charset.Count == 0)
+            sb.Append("/* no data */\n");
+        else
+        {
+            sb.Append($"/*@Size: {width}x{height}, " +
+                $"Char: {charset.Count}," +
+                $"Data per char: {data[0].Count} */\n");
+        }
+        sb.Append("const uint8_t fonts[] = {\n");
+        //每行一个字
+        for (int i = 0; i < charset.Count; i++)
+        {
+            sb.Append($"/* {charset[i]} */\n");
+            foreach (var b in data[i])
+            {
+                sb.Append($"0x{b:X2},");
+            }
+            sb.Append("\n\n");
+        }
+        sb.Append("};\n");
+        return sb.ToString();
+    }
 }