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Use the scaling factor between the font metrics for the base font and those of the fallback font selected for a given glyph. The scenario is this: the base font is typically the first one selected from the font configuration. There may be multiple fallback fonts that are different sizes; for instance, the Font Awesome font has glyphs that are square in aspect and are thus about twice the width of a typical textual monospace font. Similarly, Noto Color Emoji is another square font but that has a single set of bitmap strikes at a fixed 128 px square. The shaper returns advance metrics in the scale of the containing font, and the rasterizer will target the supplied size and dpi. We need to scale these to match the base metrics. Previously we used a crude heuristic to decide whether to scale, and that happened to work for Noto Color Emoji but not for Font Awesome, whose metrics were just inside the bounds of the heuristic. This commit allows retrieving the metrics for a given font_idx so that we can compute the correct scale factor without any heuristics, and applies that to the rasterized glyph. refs: https://github.com/wez/wezterm/issues/342 |
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Terminal Wizardry
This is a rust crate that provides a number of support functions for applications interested in either displaying data to a terminal or in building a terminal emulator.
It is currently in active development and subject to fairly wild sweeping changes.
Included functionality:
Surfacemodels a terminal display and its componentCells- Terminal attributes are aware of modern features such as True Color, Hyperlinks and will also support sixel and iterm style terminal graphics display.
Surfaces include a log ofChanges and an API for consuming and applying deltas. This is a powerful building block for synchronizing screen instances.- Escape sequence parser decodes inscrutable escape sequences and gives them semantic meaning, making the code that uses them clearer. The decoded escapes can be re-encoded, allowing applications to start with the semantic meaning and emit the appropriate escape sequence without embedding obscure binary bytes.
Capabilitiesallows probing for terminal capabilities that may not be included in the system terminfo database, and overriding them in an embedding application.Terminaltrait provides an abstraction over unix style ttys and Windows style console APIs.Changes fromSurfacecan be rendered toTerminals.Terminals allow decoding mouse and keyboard inputs in both blocking or non-blocking mode.Widgettrait allows composition of UI elements at a higher level.LineEditorimplements shell-like line editing functionality.
Windows Support
Termwiz understands how to work with both the legacy console APIs and the new PTY and virtual terminal features available in Windows 10, allowing for true color terminal applications on Windows 10.