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-->This topic describes color fonts, their support in DirectWrite and Direct2D, and how to use them in your app.
This document contains the following parts:
- Using color fonts
What are color fonts?
Color fonts, also referred to as multicolored fonts or chromatic fonts, are a font technology that allows font designers to use multiple colors within each glyph. Color fonts enable multicolored text scenarios in apps and websites with less code and more robust operating system support than ad-hoc techniques implemented above the text rendering system.
Most fonts for reading and writing the fonts you are probably most familiar with are not color fonts. These fonts define only the shape of the glyphs they contain, either with vector outlines or monochromatic bitmaps. At draw time, a text renderer fills the glyph shape using a single color (the font color ) specified by the app or document being rendered. Color fonts, on the other hand, contain color information in addition to shape information. Some approaches allow font designers to offer multiple color palettes, giving the color font artistic flexibility.
The following example shows a glyph from the Segoe UI Emoji color font. The glyph is rendered in monochrome on the left, and in color on the right.
Color fonts typically include fallback information for platforms that do not support color fonts or for scenarios in which color functionality has been disabled. On those platforms, color fonts are rendered as regular monochromatic fonts.
Why use color fonts?
Historically, designers and developers have used a variety of techniques to achieve multicolored text. For example, websites often use raster images instead of text in order to display rich headers. This approach enables artistic flexibility, but raster graphics do not scale well to all display sizes, nor do they provide the same accessibility features as real text. Another common technique is to overlay multiple monochromatic fonts in different font colors, but this typically requires extra layout code to manage.
Color fonts offer a way to achieve these visual effects with all the simplicity and functionality of regular fonts. Text rendered in a color font is the same as other text: it can be copied and pasted, it can be parsed by accessibility tools, and so forth.
What kinds of color fonts does Windows support?
The OpenType specification defines several ways to embed color information in a font. Starting in Windows 10 Anniversary Update, DirectWrite and Direct2D (and the Windows frameworks built on them) support all of these approaches. They are summarized in the table below:
| Technique | Description |
|---|---|
| COLR/CPAL tables | Uses layers of colored vectors, whose shapes are defined in the same way as single-color glyph outlines. Note: Supported starting in Windows 8.1. |
| SVG table | Uses vector images authored in the Scalable Vector Graphics format. Note: As of Windows 10 Anniversary Update, DirectWrite supports a subset of the full SVG spec. Not all SVG content is guaranteed to render in an OpenType SVG font. See SVG Support for more details. |
| CBDT/CBLC tables | Uses embedded color bitmap images. |
| sbix table | Uses embedded color bitmap images. |
Using color fonts
From the user s perspective, color fonts are just fonts . For example, they can usually be installed and uninstalled from the system in the same way as monochromatic fonts, and they are rendered as regular, selectable text.
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From the developer s perspective too, color fonts are usually used the same way as monochromatic fonts. In the XAML and Microsoft Edge frameworks, you can style your text with color fonts the same way as regular fonts, and by default your text will be rendered in color. However, if your app directly calls Direct2D APIs (or Win2D APIs) to render text, it must explicitly request color font rendering.
Using color fonts in a XAML app
The XAML platform s text elements (such as TextBlock, TextBox, RichEditBox, Glyphs, and FontIcon) support color fonts by default. Simply style your text with a color font, and any color glyphs will be rendered in color. The following code example shows one way to style a TextBlock with a color font packaged with your app. The same technique applies to regular fonts.
If you never want your XAML text element to render multicolored text, set its IsColorFontEnabledProperty property to false.
Using color fonts in Microsoft Edge
Color fonts are rendered by default in websites and web apps running on Microsoft Edge, including the XAML WebView control. Simply use HTML and CSS to style your text with a color font, and any color glyphs will be rendered in color.
Using color fonts with DirectWrite and Direct2D
Your app can use Direct2D s higher-level text drawing methods (DrawText and DrawTextLayout) or it can use lower-level techniques to draw glyph runs directly. In either case, your app requires code changes in order to handle color glyphs correctly. If your app uses Direct2D s DrawText and DrawTextLayout APIs, note that these do not render color glyphs by default. This is to avoid unexpected behavior changes in text rendering apps that were designed prior to color font support.
To opt in to color glyph rendering, pass the D2D1_DRAW_TEXT_OPTIONS_ENABLE_COLOR_FONT options flag to the drawing method. The following code example shows how to call Direct2D s DrawText method to render a string in a color font:
If your app uses lower-level APIs to handle glyph runs directly, then it will continue to function in the presence of color fonts, but it will not be able to draw color glyphs without additional logic.
To correctly handle color glyphs, your app should:
- Pass the glyph run information to TranslateColorGlyphRun, along with a DWRITE_GLYPH_IMAGE_FORMATS parameter that indicates which type(s) of color glyph the app is prepared to handle. If any color glyphs are present (based on the font and the requested DWRITE_GLYPH_IMAGE_FORMATS), then DirectWrite will split the primary glyph run into individual color glyph runs which can be accessed through the returned IDWriteColorGlyphRunEnumerator object in Step 4.
- Check the HRESULT returned by TranslateColorGlyphRun to determine whether any color glyph runs were detected. An HRESULT of DWRITE_E_NOCOLOR indicates no applicable color glyph run.
- If TranslateColorGlyphRun reported no color glyph runs (by returning DWRITE_E_NOCOLOR), then the whole glyph run is treated as monochromatic, and your app should draw it as desired (for example, using ID2D1DeviceContext::DrawGlyphRun).
- If TranslateColorGlyphRun does report the presence of color glyph runs, then your app should ignore the primary glyph run and instead use the color glyph run(s) returned by TranslateColorGlyphRun. To do so, iterate through the returned IDWriteColorGlyphRunEnumerator1 object, retrieving each color glyph run and drawing it as appropriate for its glyph image format (for example, you can use DrawColorBitmapGlyphRun and DrawSvgGlyphRun to draw color bitmap glyphs and SVG glyphs, respectively).
The following code example shows the general structure of this procedure:
Using color fonts with Win2D
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Similar to Direct2D, Win2D s text drawing APIs do not render color glyphs by default. To opt in to color glyph rendering, set the EnableColorFont options flag in the text format object your app passes to the text drawing method. The following code example shows how to render a string in a color font using Win2D: