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Aspose.Imaging for .NET 22.2

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文件详情

  • 下载:
  • 20
  • 文件大小:
  • 38.2 MB
  • Posted By:
  • samer.el-khatib4aspose
  • 浏览量:
  • 25
  • 添加日期:
  • 2/1/2022

文件详情

优化图片大小调整速度

提高了图像调整大小的速度并使其更快。

resize(ResizeType.AdaptiveResample, 3);
resize(ResizeType.AdaptiveResample, 2);
resize(ResizeType.AdaptiveResample, 0.25d);
resize(ResizeType.LanczosResample, 4);
resize(ResizeType.LanczosResample, 0.25d);

private void resize(ResizeType resizeType, double scale)
{
    string baseFolder = @"D:\";
    string fileName = "tiger.bmp";
    string inputFileName = Path.Combine(baseFolder, fileName);

    long value = 0;
    int count = scale < 1 ? 50 : 5;
    for (int i = 0; i < count; i++)
    {
        using (Image image = Image.Load(inputFileName))
        {
            var s = new Stopwatch();
            s.Start();
            image.Resize((int) Math.Round(image.Width * scale), 
             (int) Math.Round(image.Height * scale), resizeType);
            s.Stop();
            value += s.ElapsedMilliseconds;
        }
    }

    Console.WriteLine("{0}(scale - {1}:{3} times): 
         {2:0.00}ms", resizeType, scale, value, count);
}

准确的文本对齐

添加了对执行像素完美文本对齐的支持。

string baseFolder = @"D:\test";
string[] alignments = new[] {"Left", "Center", "Right"};
FontSettings.Reset();
FontSettings.SetFontsFolder(Path.Combine(baseFolder, "fonts"));
FontSettings.UpdateFonts();
foreach (var alignment in alignments)
{
    DrawString(baseFolder, alignment);   
}



private void DrawString(string baseFolder, string align)
{
    
    string fileName = "output_" + align + ".png";
    string outputFileName = Path.Combine(baseFolder, fileName);
    string[] fontNames = new[]
    {
        "Arial", "Times New Roman", 
        "Bookman Old Style", "Calibri", "Comic Sans MS", 
        "Courier New", "Microsoft Sans Serif", "Tahoma",
        "Verdana", "Proxima Nova Rg"
    };

    float[] fontSizes = new[] { 10f, 22f, 50f, 100f };
    int width = 3000;
    int height = 3500;

    using (System.IO.FileStream stream = 
      new System.IO.FileStream(outputFileName, System.IO.FileMode.Create))
    {
        //Create an instance of PngOptions and set its various properties
        Aspose.Imaging.ImageOptions.PngOptions pngOptions 
            = new Aspose.Imaging.ImageOptions.PngOptions();

        //Set the Source for PngOptions
        pngOptions.Source = new Aspose.Imaging.Sources.StreamSource(stream);

        //Create an instance of Image 
        using (Aspose.Imaging.Image image 
           = Aspose.Imaging.Image.Create(pngOptions, width, height))
        {
            //Create and initialize an instance of Graphics class
            Aspose.Imaging.Graphics graphics = new Aspose.Imaging.Graphics(image);

            //Clear Graphics surface
            graphics.Clear(Aspose.Imaging.Color.White);

            //Create a SolidBrush object and set its various properties
            Aspose.Imaging.Brushes.SolidBrush brush 
               = new Aspose.Imaging.Brushes.SolidBrush();
            brush.Color = Color.Black;
            float x = 10;
            int lineX = 0;
            float y = 10;
            float w = width - 20;
            var pen = new Pen(Color.Red, 1);

            StringAlignment alignment = StringAlignment.Near;
            switch (align)
            {
                case "Left":
                    alignment = StringAlignment.Near;
                    lineX = (int)Math.Round(x, 0);
                    break;

                case "Center":
                    alignment = StringAlignment.Center;
                    lineX = (int)Math.Round(x + w / 2f, 0);
                    break;

                case "Right":
                    alignment = StringAlignment.Far;
                    lineX = (int)(x + w);
                    break;
            }

            var stringFormat = new StringFormat(StringFormatFlags.ExactAlignment);
            stringFormat.Alignment = alignment;
            foreach (var fontName in fontNames)
            {
                foreach (var fontSize in fontSizes)
                {
                    var font = new Font(fontName, fontSize);
                    string text = String.Format("This is font: {0}, size:{1}", fontName, fontSize);
                    var s = graphics.MeasureString(text, font, SizeF.Empty, null);
                    graphics.
                     DrawString(text, font, brush, new RectangleF(x, y, w, s.Height), stringFormat);

                    y += s.Height;
                }

                graphics.DrawLine(pen, new Point((int)(x), (int)y), new Point((int)(x+w), (int)y));
            }


            graphics.DrawLine(pen, new Point(lineX, 0), new Point(lineX, (int)y));

            // save all changes.
            image.Save();
        }
    }
}

改进 YCbCr 到 RGb 子采样

此版本已将 YCbCr 改进为 RGbJpeg2000 的子采样测试覆盖率。

string[] files = new string[]
{
        "resultyuv420_watermark.jp2", "resultyuv422_watermark.jp2",
        "resultyuv444_watermark.jp2"
};

string output = string.Empty;

foreach (string file in files)
{
       string path = file;
       output = file + ".png";

       using (RasterImage image = (RasterImage)Image.Load(path))
       {
             image.Save(
                  output,
                  new PngOptions() 
        { ColorType = Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha });
       }
}

有关此版本中的功能、增强和错误修复的完整列表,请访问 Aspose.Imaging for .NET 22.2

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