Aspose.SVG for .NET 25.1 – Enhanced Rendering Quality

Aspose.SVG for .NET 25.1

In version 25.1, Aspose.SVG introduced updates to the public API, aimed primarily at enhancing support for Linux environments. These updates include replacing several enumerations from System.Drawing with implementations within Aspose’s own Aspose.SVG.Drawing and Aspose.Svg.Rendering.Image namespaces:

• The FontStyle system enumeration was replaced with WebFontStyle one.
• The SmoothingMode system enumeration was replaced with ImageRenderingOptions.UseAntialiasing property.
• The TextRenderingHint system enumeration was replaced with TextOptions.UseHinting property.

FontStyle Vs WebFontStyle

In version 25.1, the FontStyle enumeration, which specifies font styles like regular, bold, and italic, has been replaced by the WebFontStyle enumeration:

Old	New
FontStyle.Bold	WebFontStyle.Bold
FontStyle.Italic	WebFontStyle.Italic
FontStyle.Regular	WebFontStyle.Regular

Accordingly, in the GraphicContext class, the FontStyle property type has changed:

namespace Aspose.Svg.Rendering
{
    public class GraphicContext
    { 
        //From:
        public virtual FontStyle FontStyle { get; set; }
 
        //To:
        public virtual WebFontStyle FontStyle { get; set; }
    }
}

SmoothingMode and TextRenderingHint Vs UseAntialiasing and UseHinting

In version 25.1,

• the SmoothingMode system enumeration, previously used to control the antialiasing quality of rendered shapes and images, has been replaced by the ImageRenderingOptions.UseAntialiasing property;
• the TextRenderingHint system enumeration, which helps control text rendering quality, has now been replaced by the TextOptions.UseHinting property. This property maintains the clarity and readability of text.

The сorrespondence table below guides how rendering settings are applied when migrating between old and new versions of Aspose.SVG for .NET.

Correspondence Table for Different Rendering Cases

The table provides clear guidance, indicating how UseAntialiasing and UseHinting settings correspond to older properties like SmoothingMode and TextRenderingHint:

UseAntialiasing	UseHinting	SmoothingMode	TextRenderingHint
true	true	SmoothingMode.AntiAlias	TextRenderingHint.AntiAliasGridFit
false	true	SmoothingMode.None	TextRenderingHint.SingleBitPerPixelGridFit
true	false	SmoothingMode.AntiAlias	TextRenderingHint.AntiAlias
false	false	SmoothingMode.None	TextRenderingHint.SingleBitPerPixel

This table shows how to convert previous anti-aliasing and text rendering settings to the new UseAntialiasing and UseHinting properties. Here’s how you can interpret and apply this table:

1. When you decide on the required level of text clarity and shape rendering for your project, match the previous settings to the new properties.
2. Replace the old SmoothingMode and TextRenderingHint values with the corresponding UseAntialiasing and UseHinting settings.

For example, if your previous configuration used SmoothingMode.AntiAlias and TextRenderingHint.AntiAliasGridFit, switch to UseAntialiasing = true and UseHinting = true.

This is the example we will consider below.

Using SmoothingMode and TextRenderingHint Enumerations – 24.12 and Earlier Versions

This C# code snippet demonstrates how to render SVG content to an image file using Aspose.SVG for .NET with old dependencies of System.Drawing, specifically configuring the output to optimize rendering quality with anti-aliasing options:

using System.IO;
using Aspose.Svg;
using Aspose.Svg.Rendering.Image;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
...
    // Create an instance of the ImageRenderingOptions class to specify rendering quality
    var opt = new ImageRenderingOptions
    {
        SmoothingMode = SmoothingMode.AntiAlias,
        Text =
        {
            TextRenderingHint = TextRenderingHint.AntiAliasGridFit
        }
    };
    // Initialize an SVG Document
    using (var doc = new SVGDocument("source.svg"))
    // Create an ImageDevice object
    using (var device = new ImageDevice(options, "out-old.png"))
    {
        // Rendering SVG to image
        doc.RenderTo(device);
    }

Using new UseAntialiasing and UseHinting properties – Since Version 25.1

The following code demonstrates rendering SVG content to an image file using the new UseAntialiasing and UseHinting properties. This example is the same as the previous example, where were used the system SmoothingMode and TextRenderingHint enumerations:

using System.IO;
using Aspose.Svg;
using Aspose.Svg.Rendering.Image;
...
    // Create an instance of the ImageRenderingOptions class
    var options = new ImageRenderingOptions
    {
        UseAntialiasing = true,
        Text =
        {
            UseHinting = true
        }
    };
    // Initialize an SVG Document
    using (var doc = new SVGDocument("source.svg"))
    // Create an ImageDevice object
    using (var device = new ImageDevice(options, "out-new.png"))
    {
        // Rendering SVG to image
        doc.RenderTo(device);
    }

Conclusions

• The migration to WebFontStyle enumeration, UseAntialiasing, and UseHinting properties in Aspose.SVG for .NET 25.1 represents a step forward in supporting Linux environments.
• The base values of the UseAntialiasing and UseHinting properties have been changed, resulting in better text rendering when using the default options.
• This migration also aims to unify the public API to simplify access to the different versions of the Aspose.SVG for .NET library that support different SVG rendering engines.

Thus, the API changes implemented in the 25.1 release greatly affect the quality of text and image display, make it easier for users to switch between different versions of the Aspose.SVG libraries for .NET that support different SVG rendering engines, and are steps forward in Linux support.

Aspose.SVG for .NET 25.1 Release Notes – This release includes changes to the public API related to improving rendering quality, and fixing bugs to enhance the library’s overall performance and stability.