public System.IO.Stream CombineImages(System.IO.Stream sourceImageStream, System.IO.Stream detailImageStream, Rect detailImageRect)
{
#region validation
if (sourceImageStream == null)
{
throw new ArgumentNullException(nameof(sourceImageStream));
}
if (detailImageStream == null)
{
throw new ArgumentNullException(nameof(detailImageStream));
}
#endregion
using (Image <Rgba32> sourceImage = LoadImageFromStream(sourceImageStream))
using (Image <Rgba32> detailImage = LoadImageFromStream(detailImageStream))
{
SixLabors.Primitives.Point detailImagePosition = new SixLabors.Primitives.Point(0, 0);
if (detailImageRect != null)
{
SixLabors.Primitives.Size detailImageSize = new SixLabors.Primitives.Size(detailImageRect.Width, detailImageRect.Height);
detailImage.Mutate(x => x.Resize(detailImageSize));
detailImagePosition = new SixLabors.Primitives.Point(detailImageRect.X, detailImageRect.Y);
}
sourceImage.Mutate(x => x.DrawImage(detailImage, 1.0f, detailImagePosition));
return(SaveAsStream(sourceImage));
}
}
//public static IImageProcessingContext DrawTextWithHebrew(
// this IImageProcessingContext source,
// TextGraphicsOptions options,
// string text,
// Font font,
// Color color,
// PointF location)
//{
// var textToApply = text;
// return source.DrawText(options, textToApply, font, color, location);
//}
public static IImageProcessingContext DrawText(
this IImageProcessingContext source,
string text,
int fontSize,
string color,
Size size,
SixLabors.Primitives.Point location)
{
using var myBitmap = new Bitmap(size.Width, size.Height + 10);
var x = new Span <char>(text.ToCharArray());
for (int i = x.Length - 1; i >= 0; i--)
{
if (char.IsPunctuation(x[i]) || char.IsSeparator(x[i]) || char.IsSymbol(x[i]))
{
x = x.Slice(0, i);
}
else
{
break;
}
}
var textToDraw = new string(x);
//pfcoll.AddFontFile(Server.MapPath("~/Fonts/" + fontName));
//FontFamily ff = pfcoll.Families[0];
var colorToWorkWith = ColorTranslator.FromHtml(color);
using (var g = Graphics.FromImage(myBitmap))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.TextRenderingHint = TextRenderingHint.AntiAlias;
//var colorToWorkWith = System.Drawing.Color.FromArgb(color.ToArgb());
var brush = new System.Drawing.SolidBrush(colorToWorkWith);
g.DrawString(textToDraw,
new Font("Calibri", fontSize, FontStyle.Regular, GraphicsUnit.Pixel),
brush,
new RectangleF(0, 0, size.Width, size.Height),
new StringFormat()
{
Alignment = StringAlignment.Center,
Trimming = StringTrimming.Word,
});
//g.DrawString("My Text very very nice",
// new Font("Tahoma", 20),
// Brushes.White,
// new PointF(0, 0));
}
using var ms = new MemoryStream();
myBitmap.Save(ms, ImageFormat.Png);
var image = Image.Load(ms.ToArray());
return(source.DrawImage(image, location, GraphicsOptions.Default));
}
public void DrawImage(PointF position, SizeF size, ImageSharpTexture texture, float opacity)
{
var rect = ToRectangleF(new RectangleF(position, size), world);
var s = new SixLabors.Primitives.Size((int)rect.Width, (int)rect.Height);
var p = new SixLabors.Primitives.Point((int)rect.X, (int)rect.Y);
commandQueue.Enqueue(ctx =>
{
ctx.DrawImage(texture.Image, opacity, s, p);
});
}
public void RotatedEllipsesWithDifferentRatio <TPixel>(
TestImageProvider <TPixel> provider,
float ratio,
float rotationInDegree)
where TPixel : struct, IPixel <TPixel>
{
FormattableString variant = $"{ratio:F2}_AT_{rotationInDegree:00}deg";
provider.VerifyOperation(
TolerantComparer,
image =>
{
TPixel yellow = NamedColors <TPixel> .Yellow;
TPixel red = NamedColors <TPixel> .Red;
TPixel black = NamedColors <TPixel> .Black;
var center = new SixLabors.Primitives.Point(image.Width / 2, image.Height / 2);
double rotation = (Math.PI * rotationInDegree) / 180.0;
double cos = Math.Cos(rotation);
double sin = Math.Sin(rotation);
int offsetY = image.Height / 6;
int axisX = center.X + (int)-(offsetY * sin);
int axisY = center.Y + (int)(offsetY * cos);
var unicolorLinearGradientBrush = new EllipticGradientBrush <TPixel>(
center,
new SixLabors.Primitives.Point(axisX, axisY),
ratio,
GradientRepetitionMode.None,
new ColorStop <TPixel>(0, yellow),
new ColorStop <TPixel>(1, red),
new ColorStop <TPixel>(1, black));
image.Mutate(x => x.Fill(unicolorLinearGradientBrush));
},
variant,
false,
false);
}
/// <summary>
/// 添加icon
/// </summary>
public static byte[] AddIcon(this QrCode coder, byte[] bs, string icon_path)
{
using (var ms = new MemoryStream())
{
using (var img = SixLabors.ImageSharp.Image.Load(bs))
{
using (var icon = SixLabors.ImageSharp.Image.Load(icon_path))
{
icon.Mutate(x => x.Resize(width: img.Width / 5, height: img.Height / 5));
var location = new SixLabors.Primitives.Point()
{
X = (img.Width - icon.Width) / 2,
Y = (img.Height - icon.Height) / 2
};
img.Mutate(x => x.DrawImage(icon, 1, location));
img.Save(ms, new SixLabors.ImageSharp.Formats.Png.PngEncoder());
}
}
return(ms.ToArray());
}
}
/// <summary>
/// Tries to allocate space for the given image
/// If there is not enough space, returns null
/// </summary>
/// <param name="newImageData"></param>
/// <returns></returns>
public Vector2?TryAllocate(Image <Rgba32> newImageData)
{
if (newImageData == null)
{
throw new ArgumentException(nameof(newImageData));
}
if (newImageData.Width > _image.Width)
{
throw new ArgumentOutOfRangeException(nameof(newImageData), "Requested image width is too large");
}
if (newImageData.Height > _image.Height)
{
throw new ArgumentOutOfRangeException(nameof(newImageData), "Requested image height is too large");
}
var coordinates = new SixLabors.Primitives.Point();
int mostAllocatedWholeImage = _image.Height;
for (var startWidth = 0; startWidth < _allocated.Length - newImageData.Width; ++startWidth)
{
//Tracks the most allocations in a line; this is the starting point for the data if this section is valid
int mostAllocated = 0;
int currentWidth;
for (currentWidth = 0; currentWidth < newImageData.Width; ++currentWidth)
{
//Line is full
if (_allocated[startWidth + currentWidth] >= _image.Height)
{
break;
}
if (_allocated[startWidth + currentWidth] >= mostAllocated)
{
mostAllocated = _allocated[startWidth + currentWidth];
}
}
if (currentWidth == newImageData.Width)
{
coordinates.X = startWidth;
coordinates.Y = mostAllocatedWholeImage = mostAllocated;
}
}
if (mostAllocatedWholeImage + newImageData.Height <= _image.Height)
{
//There's room
//Update allocated to cover image and padding between previous data on each line
for (var x = 0; x < newImageData.Width; ++x)
{
_allocated[coordinates.X + x] = mostAllocatedWholeImage + newImageData.Height;
}
var graphicsOptions = GraphicsOptions.Default;
graphicsOptions.BlenderMode = PixelBlenderMode.Src;
//Add the image data to the current lightmap image
_image.Mutate(context => context.DrawImage(graphicsOptions, newImageData, coordinates));
return(new Vector2(coordinates.X, coordinates.Y));
}
return(null);
}
/// <summary>
///
/// </summary>
/// <param name="length"></param>
/// <returns></returns>
public byte[] GetCaptcha(int length = 4)
{
var httpContext = _httpContextAccessor.HttpContext;
if (httpContext == null)
{
throw new Exception("RecaptchaValidator should be used in a valid HTTP context!");
}
var random = new Random();
var captcha = random.Next((int)Math.Pow(10, length), (int)Math.Pow(10, length + 1))
.ToString()
.Substring(1);
httpContext.Session.SetString(SessionKey, captcha);
//颜色列表，用于验证码、噪线、噪点
var colors = new[] { Rgba32.Black, Rgba32.Red, Rgba32.DarkBlue, Rgba32.Green, Rgba32.Orange, Rgba32.Brown, Rgba32.DarkCyan, Rgba32.Purple };
//创建画布
var imageWidth = captcha.Length * 13;
using (var image = new Image <Rgba32>(imageWidth, 28))
{
//背景设为白色
image.Mutate(x => x.BackgroundColor(Rgba32.White));
//向画板中绘制贝塞尔样条
for (var i = 0; i < 2; i++)
{
var p1 = new PointF(0, random.Next(image.Height));
var p2 = new PointF(random.Next(image.Width), random.Next(image.Height));
var p3 = new PointF(random.Next(image.Width), random.Next(image.Height));
var p4 = new PointF(image.Width, random.Next(image.Height));
var clr = colors[random.Next(colors.Length)];
image.Mutate(x => x.DrawBeziers(
GraphicsOptions.Default,
new SolidBrush <Rgba32>(clr),
1f,
p1, p2, p3, p4));
}
//画噪点
for (var i = 0; i < 50; i++)
{
IBrush <Rgba32> brush = new SolidBrush <Rgba32>(Rgba32.LightGray);
Path path = new RegularPolygon(new PointF(random.Next(image.Width), random.Next(image.Height)), 3, 1);
image.Mutate(x => x.Draw(GraphicsOptions.Default, brush, 1f, path));
}
//画验证码字符串
image.Mutate(x =>
{
for (var i = 0; i < captcha.Length; i++)
{
var cindex = random.Next(colors.Length - 1); //随机颜色索引值
var brush = new SolidBrush <Rgba32>(colors[cindex]); //颜色
var ii = random.Next(4, 8); // 控制验证码不在同一高度
x.DrawText(captcha[i].ToString(), _defaultFont, brush, new PointF(3 + (i * 12), ii));
}
});
using (var stream = new MemoryStream())
{
image.Save(stream, new JpegEncoder());
stream.Seek(0, SeekOrigin.Begin);
return(stream.ToArray());
}
}
}
