Struct freetype::glyph_slot::GlyphSlot

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pub struct GlyphSlot { /* private fields */ }

Expand description

A struct encapsulating the space for a glyph within a Library

Implementations

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impl GlyphSlot

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pub unsafe fn from_raw(library_raw: FT_Library, raw: FT_GlyphSlot) -> Self

Create a GlyphSlot from its constituent C parts

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pub fn render_glyph(&self, render_mode: RenderMode) -> FtResult<()>

Convert a given glyph image to a bitmap. It does so by inspecting the glyph image format, finding the relevant renderer, and invoking it.

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pub fn get_subglyph_info(&self, sub_index: u32) -> FtResult<SubGlyphInfo>

Retrieve a description of a given subglyph. Only use it if the glyph’s format is FT_GLYPH_FORMAT_COMPOSITE; an error is returned otherwise.

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pub fn get_glyph(&self) -> FtResult<Glyph>

Returns a glyph object, that is similar to a GlyphSlot but managed outside of the library

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pub fn outline(&self) -> Option<Outline<'_>>

In freetype, the Outline object is a scalable glyph. This method unpacks a glyph into this object, or returns None if the glyph has no outline

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pub fn bitmap(&self) -> Bitmap

This field is used as a bitmap descriptor when the slot format is FT_GLYPH_FORMAT_BITMAP. Note that the address and content of the bitmap buffer can change between calls of FT_Load_Glyph and a few other functions.

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pub fn bitmap_left(&self) -> i32

The bitmap’s left bearing expressed in integer pixels. Only valid if the format is FT_GLYPH_FORMAT_BITMAP, this is, if the glyph slot contains a bitmap.

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pub fn bitmap_top(&self) -> i32

The bitmap’s top bearing expressed in integer pixels. Remember that this is the distance from the baseline to the top-most glyph scanline, upwards y coordinates being positive.

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pub fn advance(&self) -> Vector

This shorthand is, depending on FT_LOAD_IGNORE_TRANSFORM, the transformed (hinted) advance width for the glyph, in 26.6 fractional pixel format. As specified with FT_LOAD_VERTICAL_LAYOUT, it uses either the ‘horiAdvance’ or the ‘vertAdvance’ value of ‘metrics’ field.

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pub fn linear_hori_advance(&self) -> FT_Fixed

The advance width of the unhinted glyph. Its value is expressed in 16.16 fractional pixels, unless FT_LOAD_LINEAR_DESIGN is set when loading the glyph. This field can be important to perform correct WYSIWYG layout. Only relevant for outline glyphs.

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pub fn linear_vert_advance(&self) -> FT_Fixed

The advance height of the unhinted glyph. Its value is expressed in 16.16 fractional pixels, unless FT_LOAD_LINEAR_DESIGN is set when loading the glyph. This field can be important to perform correct WYSIWYG layout. Only relevant for outline glyphs.

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pub fn metrics(&self) -> GlyphMetrics

The metrics of the last loaded glyph in the slot. The returned values depend on the last load flags (see the FT_Load_Glyph API function) and can be expressed either in 26.6 fractional pixels or font units.

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