330 lines
11 KiB
C#
330 lines
11 KiB
C#
using System;
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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.Runtime.InteropServices;
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namespace AllBase
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{
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public class ImageBuild
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{
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public byte[] Img;
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public int Width = 0, Height = 0;
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public Image InitImage = null;
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public ImageBuild(byte[] image)
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{
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if (image == null || image.Length == 0)
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return;
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Img = image;
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try
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{
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MemoryStream ms = new MemoryStream(Img);
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InitImage = Image.FromStream(ms);
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ms.Close();
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}
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catch (Exception e)
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{
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LogSave.Add(e.Message);
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}
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Width = InitImage.Width;
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Height = InitImage.Height;
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}
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/// <summary>
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/// 裁剪为指定大小，不符合则返回null
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/// </summary>
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/// <param name="width"></param>
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/// <param name="height"></param>
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/// <returns></returns>
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public byte[] CutToSize(int width, int height)
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{
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if (InitImage == null)
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return null;
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int w = InitImage.Width;
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int h = InitImage.Height;
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if (w < width || h < height)
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{
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//return null;
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width = w;
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height = h;
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}
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int x = 0, y = 0, nw = w, nh = h;
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int tx = 0, ty = 0, tw = width, th = height;
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double f = w * 1.0 / width;
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double t = h * 1.0 / height;
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if (f == t)//无需变化
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{
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}
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else if (f > t)//宽度较大
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{
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x = (int)(((f - t) / 2) * width);
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nw = w - x * 2;
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}
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else//高度较大
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{
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y = (int)((t - f) / 2 * height);
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nh = h - y * 2;
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}
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Rectangle fromR = new Rectangle(x, y, nw, nh);
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Rectangle toR = new Rectangle(tx, ty, tw, th);
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Bitmap pickedImage = new Bitmap(width, height);
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Graphics pickedG = Graphics.FromImage(pickedImage);
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pickedG.InterpolationMode = InterpolationMode.Low;
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pickedG.SmoothingMode = SmoothingMode.HighSpeed;
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pickedG.DrawImage(InitImage, toR, fromR, GraphicsUnit.Pixel);
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//转图片后转二进制数组
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Image initImagex = (Image)pickedImage.Clone();
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MemoryStream ms = new MemoryStream();
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ImageCodecInfo icc = GetCodeInfo("1.jpg");
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long quality = 75;
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(Encoder.Quality, quality);
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initImagex.Save(ms, icc, ep);
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byte[] bytes = ms.GetBuffer();
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return bytes;
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}
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/// <summary>
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/// 添加线条
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/// </summary>
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/// <param name="img"></param>
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public void AddLineToImage(ref byte[] img)
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{
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MemoryStream ms = new MemoryStream(img);
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var image = (Bitmap)Image.FromStream(ms);
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ms.Close();
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int width = image.Width;
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int height = image.Height;
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if (width < 100 || height < 100)
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return;
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int r = Randomx.GetId(100, 256);
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int b = Randomx.GetId(100, 256);
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int g = Randomx.GetId(100, 256);
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int h = Randomx.GetId(1, 10);
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var c = Color.FromArgb(r, g, b);
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for (int i = 0; i < h; i++)
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{
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for (int j = 0; j < height; j++)
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image.SetPixel(i, j, c);
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for (int j = 0; j < width; j++)
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image.SetPixel(j, i, c);
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}
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for (int i = height - h; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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image.SetPixel(j, i, c);
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}
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for (int i = width - h; i < width; i++)
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{
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for (int j = 0; j < height; j++)
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image.SetPixel(i, j, c);
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}
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ImageCodecInfo icc = GetCodeInfo("1.jpg");
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long quality = 75;
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ms = new MemoryStream();
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(Encoder.Quality, quality);
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image.Save(ms, icc, ep);
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img = ms.ToArray();
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//FileBase.WriteBytes("1.jpg", bytes);
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}
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/// <summary>
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/// 输出固定大小图片，背景白色填充，返回JPG格式二进制代码
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/// </summary>
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/// <param name="width"></param>
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/// <param name="height"></param>
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/// <param name="maxSize">最大尺寸KB</param>
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/// <returns></returns>
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public byte[] BuildNewSize(int width, int height, int maxSize)
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{
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if (InitImage == null)
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return null;
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int w = InitImage.Width;
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int h = InitImage.Height;
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int x = 0, y = 0, nw = w, nh = h;
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int tx = 0, ty = 0, tw = width, th = height;
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//先缩放
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if (w <= width && h <= height)//无需缩放
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{
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tx = (width - w) / 2;
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tw = w;
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ty = (height - h) / 2;
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th = h;
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}
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else if (w < width && h > height)
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{
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tx = (width - w) / 2;
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tw = w;
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y = (h - height) / 2;
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nh = height;
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}
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else if (w > width && h < height)
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{
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ty = (height - h) / 2;
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th = h;
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x = (w - width) / 2;
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nw = width;
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}
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else
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{
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double f = w * 1.0 / width;
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double t = h * 1.0 / height;
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if (f == t)//无需变化
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{
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}
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else if (f > t)//宽度较大
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{
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x = (int)(((f - t) / 2) * width);
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nw = w - x * 2;
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}
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else//高度较大
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{
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y = (int)((t - f) / 2 * height);
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nh = h - y * 2;
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}
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}
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Rectangle fromR = new Rectangle(x, y, nw, nh);
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Rectangle toR = new Rectangle(tx, ty, tw, th);
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Bitmap pickedImage = new Bitmap(width, height);
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for (int i = 0; i < pickedImage.Width; i++)
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{
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for (int j = 0; j < pickedImage.Height; j++)
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{
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Color color = Color.FromArgb(255, 255, 255);
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pickedImage.SetPixel(i, j, color);
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}
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}
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Graphics pickedG = Graphics.FromImage(pickedImage);
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pickedG.InterpolationMode = InterpolationMode.Low;
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pickedG.SmoothingMode = SmoothingMode.HighSpeed;
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pickedG.DrawImage(InitImage, toR, fromR, GraphicsUnit.Pixel);
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//转图片后转二进制数组
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Image initImagex = (Image)pickedImage.Clone();
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MemoryStream ms = new MemoryStream();
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ImageCodecInfo icc = GetCodeInfo("1.jpg");
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long quality = 75;
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EncoderParameters ep = new EncoderParameters(1);
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
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initImagex.Save(ms, icc, ep);
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byte[] bytes = ms.GetBuffer();
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if (bytes.Length > maxSize * 1024)
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{
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ms = new MemoryStream();
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 65l);
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initImagex.Save(ms, icc, ep);
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bytes = ms.GetBuffer();
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}
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if (bytes.Length > maxSize * 1024)
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{
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ms = new MemoryStream();
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ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 55l);
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initImagex.Save(ms, icc, ep);
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bytes = ms.GetBuffer();
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}
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if (bytes.Length > maxSize * 1024)
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{
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return null;
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}
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//ImageCodecInfo icc = GetCodeInfo("1.jpg");
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//initImagex.Save("22.jpg", icc, ep);
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return bytes;
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}
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/// <summary>
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/// 根据路劲得出图片编码信息
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/// </summary>
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/// <param name="path"></param>
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/// <returns></returns>
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public ImageCodecInfo GetCodeInfo(string path)
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{
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string exe = path.Split('.')[path.Split('.').Length - 1].ToLower();
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ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
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ImageCodecInfo ici = null, defCodecInfo = null;
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foreach (ImageCodecInfo i in icis)
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{
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if (i.MimeType == "image/jpeg")
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defCodecInfo = i;
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if ((exe == "jpg" || exe == "jpeg") && i.MimeType == "image/jpeg")
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{
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ici = i;
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}
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if (exe == "bmp" && i.MimeType == "image/bmp")
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{
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ici = i;
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}
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if (exe == "png" && i.MimeType == "image/png")
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{
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ici = i;
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}
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if (exe == "gif" && i.MimeType == "image/gif")
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{
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ici = i;
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}
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}
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if (ici == null)
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ici = defCodecInfo;
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return ici;
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}
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/// <summary>
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/// image 大小转换
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/// </summary>
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/// <param name="imgToResize"></param>
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/// <param name="size"></param>
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/// <returns></returns>
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public static System.Drawing.Image resizeImage(System.Drawing.Image imgToResize, Size size)
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{
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//获取图片宽度
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int sourceWidth = imgToResize.Width;
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//获取图片高度
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int sourceHeight = imgToResize.Height;
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float nPercent = 0;
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float nPercentW = 0;
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float nPercentH = 0;
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//计算宽度的缩放比例
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nPercentW = ((float)size.Width / (float)sourceWidth);
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//计算高度的缩放比例
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nPercentH = ((float)size.Height / (float)sourceHeight);
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if (nPercentH < nPercentW)
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nPercent = nPercentH;
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else
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nPercent = nPercentW;
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//期望的宽度
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int destWidth = (int)(sourceWidth * nPercent);
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//期望的高度
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int destHeight = (int)(sourceHeight * nPercent);
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Bitmap b = new Bitmap(destWidth, destHeight);
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Graphics g = Graphics.FromImage((System.Drawing.Image)b);
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g.InterpolationMode = InterpolationMode.HighQualityBicubic;
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//绘制图像
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g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
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g.Dispose();
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return (System.Drawing.Image)b;
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}
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[DllImport("gdi32.dll")]
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public static extern bool DeleteObject(IntPtr hObject);
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/// <summary>
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/// 将Image转换为Ico
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/// </summary>
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/// <param name="image"></param>
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/// <param name="nullTonull"></param>
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/// <returns></returns>
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public static Icon ConvertToIcon(Image image)
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{
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Bitmap bmp = new Bitmap(image);
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IntPtr h = bmp.GetHicon();
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Icon icon = Icon.FromHandle(h);
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DeleteObject(h);
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return icon;
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}
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}
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}
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