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Text Rendering Hates You - Faultlore

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Rendering text, how hard could it be? As it turns out, incredibly hard! To my knowledge, literally no system renders text “perfectly”. It’s all best-effort, although some efforts are more important than others. I’ll be assuming you want to support arbitrary text provided by users with custom fonts, colors, and styles with line-wrapping and support for text-selection. Basically the minimum required to properly display a simple rich-text document, terminal, webpage, or anything else. The overarching theme here will be: there are no consistent right answers, everything is way more important than you think, and everything affects everything else. The topics I focus on here have no particular rhyme or reason, they’re just the ones that come to mind after a few years of working on rendering in Firefox. For instance, I don’t spend much time talking about the challenges of text-segmentation or managing the different platform-specific text libraries, because I don’t look at that much. Text is c

Text Rendering Hates You Rendering text, how hard could it be? As it turns out, incredibly hard! To my knowledge, literally no system renders text “perfectly”. It’s all best-effort, although some efforts are more important than others. I’ll be assuming you want to support arbitrary text provided by users with custom fonts, colors, and styles with line-wrapping and support for text-selection. Basically the minimum required to properly display a simple rich-text document, terminal, webpage, or anything else. The overarching theme here will be: there are no consistent right answers, everything is

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