+ BmpFile：24bit真彩色位图数据结构类
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SunnyUI/Common/UBmp.cs
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SunnyUI/Common/UBmp.cs
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/******************************************************************************
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* SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
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* CopyRight (C) 2012-2021 ShenYongHua(沈永华).
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* QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
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*
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* Blog: https://www.cnblogs.com/yhuse
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* Gitee: https://gitee.com/yhuse/SunnyUI
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* GitHub: https://github.com/yhuse/SunnyUI
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*
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* SunnyUI.dll can be used for free under the GPL-3.0 license.
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* If you use this code, please keep this note.
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* 如果您使用此代码，请保留此说明。
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******************************************************************************
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* 文件名称: UBmp.cs
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* 文件说明: 24bit真彩色位图数据结构类
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* 当前版本: V3.0
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* 创建日期: 2021-12-15
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*
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* 2021-12-15: V3.0.9 增加文件说明
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******************************************************************************/
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using System;
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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.Runtime.InteropServices;
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namespace Sunny.UI
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{
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/// <summary>
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/// 24bit 真彩色位图文件头部结构
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/// </summary>
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
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internal struct BmpHead
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{
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/// <summary>
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/// 识别位图的类型：‘BM’
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/// </summary>
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public ushort Head { get; set; }
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/// <summary>
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/// 表示的整个文件的大小
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/// </summary>
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public uint FileSize { get; set; }
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/// <summary>
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/// 保留，必须设置为0
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/// </summary>
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public uint Reserved { get; set; }
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/// <summary>
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/// 从文件开始到位图数据开始之间的数据(bitmap data)之间的偏移量, 常数0x36
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/// </summary>
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public uint BitmapDataOffset { get; set; }
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/// <summary>
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/// 位图信息头(Bitmap Info Header)的长度，用来描述位图的颜色、压缩方法等，常数0x28
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/// </summary>
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public uint BitmapHeaderSize { get; set; }
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/// <summary>
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/// 位图的宽度，以象素为单位
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/// </summary>
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public uint Width { get; set; }
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/// <summary>
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/// 位图的高度，以象素为单位
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/// </summary>
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public uint Height { get; set; }
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/// <summary>
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/// 位图的位面数（注：该值将总是1）
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/// </summary>
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public ushort Planes { get; set; }
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/// <summary>
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/// 每个象素的位数，24 - 24bit 真彩色位图
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/// </summary>
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public ushort BitsPerPixel { get; set; }
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/// <summary>
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/// 0 - 不压缩 (使用BI_RGB表示)
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/// </summary>
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public uint Compression { get; set; }
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/// <summary>
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/// 用字节数表示的位图数据的大小。该数必须是4的倍数
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/// </summary>
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public uint BitmapDataSize { get; set; }
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/// <summary>
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/// 用象素/米表示的水平分辨率 0
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/// </summary>
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public uint HResolution { get; set; }
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/// <summary>
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/// 用象素/米表示的垂直分辨率 0
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/// </summary>
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public uint VResolution { get; set; }
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/// <summary>
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/// 位图使用的颜色数。 0
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/// </summary>
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public uint Colors { get; set; }
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/// <summary>
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/// 指定重要的颜色数。 0
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/// </summary>
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public uint ImportantColors { get; set; }
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public void Init(Bitmap bitmap)
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{
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Head = 0x4D42;
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Width = (uint)bitmap.Width;
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Height = (uint)bitmap.Height;
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BitmapDataOffset = 0x36;
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BitmapHeaderSize = 0x28;
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Planes = 0x01;
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BitsPerPixel = 0x18;
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//这行要注意，每行数据为宽*高*3，再补上宽度除4取余数
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BitmapDataSize = (uint)(bitmap.Width * bitmap.Height * 3 + bitmap.Height * (bitmap.Width % 4));
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FileSize = BitmapDataOffset + BitmapDataSize;
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}
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public void Init(int width, int height)
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{
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Head = 0x4D42;
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Width = (uint)width;
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Height = (uint)height;
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BitmapDataOffset = 0x36;
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BitmapHeaderSize = 0x28;
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Planes = 0x01;
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BitsPerPixel = 0x18;
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//这行要注意，每行数据为宽*高*3，再补上宽度除4取余数
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BitmapDataSize = (uint)(width * height * 3 + height * (width % 4));
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FileSize = BitmapDataOffset + BitmapDataSize;
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}
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}
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public class BmpFile
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{
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BmpHead head;
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byte[] data;
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/// <summary>
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/// 慢于 bitmap.Save(XX,ImageFormat.Bmp)，只是为了解释BMP文件数据格式
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/// </summary>
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/// <param name="bitmap"></param>
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public BmpFile(Bitmap bitmap)
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{
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head = new BmpHead();
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head.Init(bitmap);
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data = new byte[head.FileSize];
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Array.Copy(head.StructToBytes(), 0, data, 0, (int)head.BitmapDataOffset);
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var sourceArea = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
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var bitmapData = bitmap.LockBits(sourceArea, ImageLockMode.ReadOnly, PixelFormat.Format32bppPArgb);
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byte[] tmp = new byte[bitmap.Width * bitmap.Height * 4];
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Marshal.Copy(bitmapData.Scan0, tmp, 0, tmp.Length);
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bitmap.UnlockBits(bitmapData);
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//BMP文件的数据从左下角开始，每行向上。System.Drawing.Bitmap数据是从左上角开始，每行向下
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int idx = (int)head.BitmapDataOffset;
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for (int i = 0; i < bitmap.Height; i++)
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{
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int offset = bitmap.Height - 1 - i;
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offset *= bitmap.Width * 4;
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for (int j = 0; j < bitmap.Width; j++)
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{
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Array.Copy(tmp, offset + j * 4, Data, idx, 3);
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idx += 3;
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}
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idx += bitmap.Width % 4;
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}
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}
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/// <summary>
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/// 从图像数据创建Bmp图片
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/// </summary>
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/// <param name="width">宽度</param>
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/// <param name="height">高度</param>
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/// <param name="bmpData">数据，从左上角开始，为每个点的B、G、R循环</param>
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public BmpFile(int width, int height, byte[] bmpData)
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{
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head = new BmpHead();
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head.Init(width, height);
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data = new byte[head.FileSize];
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Array.Copy(head.StructToBytes(), 0, data, 0, (int)head.BitmapDataOffset);
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if (bmpData.Length != width * height * 3) return;
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//BMP文件的数据从左下角开始，每行向上。System.Drawing.Bitmap数据是从左上角开始，每行向下
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int idx = (int)head.BitmapDataOffset;
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for (int i = 0; i < height; i++)
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{
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int offset = height - 1 - i;
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offset *= width * 3;
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Array.Copy(bmpData, offset, data, idx, width * 3);
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idx += width * 3;
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}
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}
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public byte[] Data => data;
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public void SaveToFile(string fileName)
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{
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File.WriteAllBytes(fileName, data);
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}
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public Bitmap Bitmap()
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{
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MemoryStream ms = new MemoryStream(data);
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ms.Position = 0;
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return new Bitmap(ms);
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}
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}
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}
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