![]() 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 on. Another common technique is to overlay multiple monochromatic fonts in different font colors but that typically requires extra layout code to manage.Ĭolor fonts offer a way to achieve those visual effects with all the simplicity and functionality of regular fonts. ![]() That approach enables artistic flexibility, but raster graphics don't scale well to all display sizes, and nor do they provide the same accessibility features as real text. For example, websites often use raster images instead of text in order to display rich headers. Historically, designers and developers have used a variety of techniques to achieve multicolored text. ![]() And then color font support can be enabled by translating those monochrome base glyph runs to color glyphs runs at rendering time. The output of the text layout process is a sequence of monochrome glyph runs. The mapping of characters to glyphs, and the positioning of those glyphs, all use monochrome glyph IDs and their associated metrics. And that's true whether you use the IDWriteTextLayout interface, or whether you implement your own text layout algorithm. On those platforms, color fonts are rendered as regular monochromatic fonts.īecause color font support is implemented at the glyph rendering level, it doesn't affect text layout. The glyph is rendered in monochrome on the left, and in color on the right.Ĭolor fonts typically include fallback information for platforms that don't support them, or for scenarios in which color functionality has been disabled. Here's a glyph from the Segoe UI Emoji color font. Some approaches allow font designers to offer multiple color palettes, giving the color font artistic flexibility. Color fonts, on the other hand, contain color information in addition to shape information. 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. Such fonts define only the shape of the glyphs that they contain either with vector outlines or monochromatic bitmaps. The fonts that most of us are familiar with are not color fonts. 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. They're a font technology that allows font designers to use multiple colors within each glyph. And to render glyphs in color, your app must use different glyph-rendering APIs (as we'll discuss), instead of calling the monochrome DrawGlyphRun methods.Ĭolor fonts are also referred to as multicolored fonts or chromatic fonts. A color font, on the other hand, also has color representations of some glyphs. For convenience, we'll refer to that as monochrome glyph rendering. Both DirectWrite and Direct2D have DrawGlyphRun methods that render glyph runs by filling the glyph shapes with a specified text color. What are color fonts?īy default, a glyph has a shape but no intrinsic color. This topic describes color fonts, their support in DirectWrite and Direct2D (and some other frameworks), and how to use them in your app.
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