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use crate::{DefaultSectionHasher, Font, FontId, GlyphBrush, SharedBytes}; use full_rusttype::gpu_cache::Cache; use std::hash::BuildHasher; /// Builder for a [`GlyphBrush`](struct.GlyphBrush.html). /// /// # Example /// /// ```no_run /// use glyph_brush::{GlyphBrush, GlyphBrushBuilder}; /// # type Vertex = (); /// /// let dejavu: &[u8] = include_bytes!("../../../fonts/DejaVuSans.ttf"); /// let mut glyph_brush: GlyphBrush<'_, Vertex> = /// GlyphBrushBuilder::using_font_bytes(dejavu).build(); /// ``` pub struct GlyphBrushBuilder<'a, H = DefaultSectionHasher> { pub font_data: Vec<Font<'a>>, pub initial_cache_size: (u32, u32), pub gpu_cache_scale_tolerance: f32, pub gpu_cache_position_tolerance: f32, pub cache_glyph_positioning: bool, pub cache_glyph_drawing: bool, pub section_hasher: H, } impl<'a> GlyphBrushBuilder<'a> { /// Specifies the default font data used to render glyphs. /// Referenced with `FontId(0)`, which is default. #[inline] pub fn using_font_bytes<B: Into<SharedBytes<'a>>>(font_0_data: B) -> Self { Self::using_font(Font::from_bytes(font_0_data).unwrap()) } #[inline] pub fn using_fonts_bytes<B, V>(font_data: V) -> Self where B: Into<SharedBytes<'a>>, V: Into<Vec<B>>, { Self::using_fonts( font_data .into() .into_iter() .map(|data| Font::from_bytes(data).unwrap()) .collect::<Vec<_>>(), ) } /// Specifies the default font used to render glyphs. /// Referenced with `FontId(0)`, which is default. #[inline] pub fn using_font(font_0: Font<'a>) -> Self { Self::using_fonts(vec![font_0]) } pub fn using_fonts<V: Into<Vec<Font<'a>>>>(fonts: V) -> Self { GlyphBrushBuilder { font_data: fonts.into(), initial_cache_size: (256, 256), gpu_cache_scale_tolerance: 0.5, gpu_cache_position_tolerance: 0.1, cache_glyph_positioning: true, cache_glyph_drawing: true, section_hasher: DefaultSectionHasher::default(), } } } impl<'a, H: BuildHasher> GlyphBrushBuilder<'a, H> { /// Adds additional fonts to the one added in [`using_font`](#method.using_font) / /// [`using_font_bytes`](#method.using_font_bytes). /// Returns a [`FontId`](struct.FontId.html) to reference this font. pub fn add_font_bytes<B: Into<SharedBytes<'a>>>(&mut self, font_data: B) -> FontId { self.font_data .push(Font::from_bytes(font_data.into()).unwrap()); FontId(self.font_data.len() - 1) } /// Adds additional fonts to the one added in [`using_font`](#method.using_font) / /// [`using_font_bytes`](#method.using_font_bytes). /// Returns a [`FontId`](struct.FontId.html) to reference this font. pub fn add_font(&mut self, font_data: Font<'a>) -> FontId { self.font_data.push(font_data); FontId(self.font_data.len() - 1) } /// Initial size of 2D texture used as a gpu cache, pixels (width, height). /// The GPU cache will dynamically quadruple in size whenever the current size /// is insufficient. /// /// Defaults to `(256, 256)` pub fn initial_cache_size(mut self, size: (u32, u32)) -> Self { self.initial_cache_size = size; self } /// Sets the maximum allowed difference in scale used for judging whether to reuse an /// existing glyph in the GPU cache. /// /// Defaults to `0.5` /// /// See rusttype docs for `rusttype::gpu_cache::Cache` pub fn gpu_cache_scale_tolerance(mut self, tolerance: f32) -> Self { self.gpu_cache_scale_tolerance = tolerance; self } /// Sets the maximum allowed difference in subpixel position used for judging whether /// to reuse an existing glyph in the GPU cache. Anything greater than or equal to /// 1.0 means "don't care". /// /// Defaults to `0.1` /// /// See rusttype docs for `rusttype::gpu_cache::Cache` pub fn gpu_cache_position_tolerance(mut self, tolerance: f32) -> Self { self.gpu_cache_position_tolerance = tolerance; self } /// Sets whether perform the calculation of glyph positioning according to the layout /// every time, or use a cached result if the input `Section` and `GlyphPositioner` are the /// same hash as a previous call. /// /// Improves performance. Should only disable if using a custom GlyphPositioner that is /// impure according to it's inputs, so caching a previous call is not desired. Disabling /// also disables [`cache_glyph_drawing`](#method.cache_glyph_drawing). /// /// Defaults to `true` pub fn cache_glyph_positioning(mut self, cache: bool) -> Self { self.cache_glyph_positioning = cache; self } /// Sets optimising drawing by reusing the last draw requesting an identical draw queue. /// /// Improves performance. Is disabled if /// [`cache_glyph_positioning`](#method.cache_glyph_positioning) is disabled. /// /// Defaults to `true` pub fn cache_glyph_drawing(mut self, cache: bool) -> Self { self.cache_glyph_drawing = cache; self } /// Sets the section hasher. `GlyphBrush` cannot handle absolute section hash collisions /// so use a good hash algorithm. /// /// This hasher is used to distinguish sections, rather than for hashmap internal use. /// /// Defaults to [xxHash](https://docs.rs/twox-hash). /// /// # Example /// ```no_run /// # use glyph_brush::GlyphBrushBuilder; /// # fn main() { /// # let some_font: &[u8] = include_bytes!("../../../fonts/DejaVuSans.ttf"); /// # type SomeOtherBuildHasher = glyph_brush::DefaultSectionHasher; /// GlyphBrushBuilder::using_font_bytes(some_font) /// .section_hasher(SomeOtherBuildHasher::default()) /// // ... /// # ; /// # } /// ``` pub fn section_hasher<T: BuildHasher>(self, section_hasher: T) -> GlyphBrushBuilder<'a, T> { GlyphBrushBuilder { section_hasher, font_data: self.font_data, initial_cache_size: self.initial_cache_size, gpu_cache_scale_tolerance: self.gpu_cache_scale_tolerance, gpu_cache_position_tolerance: self.gpu_cache_position_tolerance, cache_glyph_positioning: self.cache_glyph_positioning, cache_glyph_drawing: self.cache_glyph_drawing, } } /// Builds a `GlyphBrush` using the input gfx factory pub fn build<V: Clone + 'static>(self) -> GlyphBrush<'a, V, H> { let (cache_width, cache_height) = self.initial_cache_size; GlyphBrush { fonts: self.font_data, texture_cache: Cache::builder() .dimensions(cache_width, cache_height) .scale_tolerance(self.gpu_cache_scale_tolerance) .position_tolerance(self.gpu_cache_position_tolerance) .build(), last_draw: <_>::default(), section_buffer: <_>::default(), calculate_glyph_cache: <_>::default(), last_frame_seq_id_sections: <_>::default(), frame_seq_id_sections: <_>::default(), keep_in_cache: <_>::default(), cache_glyph_positioning: self.cache_glyph_positioning, cache_glyph_drawing: self.cache_glyph_drawing && self.cache_glyph_positioning, section_hasher: self.section_hasher, last_pre_positioned: <_>::default(), pre_positioned: <_>::default(), } } } /// Macro to delegate builder methods to an inner `glyph_brush::GlyphBrushBuilder` /// /// Implements: /// * `add_font_bytes` /// * `add_font` /// * `initial_cache_size` /// * `gpu_cache_scale_tolerance` /// * `gpu_cache_position_tolerance` /// * `cache_glyph_positioning` /// * `cache_glyph_drawing` /// /// # Example /// ``` /// use glyph_brush::*; /// use std::hash::BuildHasher; /// /// # pub struct DownstreamGlyphBrush; /// pub struct DownstreamGlyphBrushBuilder<'a, H> { /// inner: glyph_brush::GlyphBrushBuilder<'a, H>, /// some_config: bool, /// } /// /// impl<'a, H: BuildHasher> DownstreamGlyphBrushBuilder<'a, H> { /// delegate_glyph_brush_builder_fns!(inner); /// /// /// Sets some downstream configuration /// pub fn some_config(mut self, some_config: bool) -> Self { /// self.some_config = some_config; /// self /// } /// /// // Must be manually delegated /// pub fn section_hasher<T: BuildHasher>( /// self, /// section_hasher: T, /// ) -> DownstreamGlyphBrushBuilder<'a, T> { /// DownstreamGlyphBrushBuilder { /// inner: self.inner.section_hasher(section_hasher), /// some_config: self.some_config, /// } /// } /// /// pub fn build(self) -> DownstreamGlyphBrush { /// // ... /// # DownstreamGlyphBrush /// } /// } /// # fn main() {} /// ``` #[macro_export] macro_rules! delegate_glyph_brush_builder_fns { ($inner:ident) => { /// Adds additional fonts to the one added in [`using_font`](#method.using_font) / /// [`using_font_bytes`](#method.using_font_bytes). /// Returns a [`FontId`](struct.FontId.html) to reference this font. pub fn add_font_bytes<B: Into<$crate::rusttype::SharedBytes<'a>>>(&mut self, font_data: B) -> $crate::FontId { self.$inner.add_font_bytes(font_data) } /// Adds additional fonts to the one added in [`using_font`](#method.using_font) / /// [`using_font_bytes`](#method.using_font_bytes). /// Returns a [`FontId`](struct.FontId.html) to reference this font. pub fn add_font(&mut self, font_data: $crate::rusttype::Font<'a>) -> $crate::FontId { self.$inner.add_font(font_data) } /// Initial size of 2D texture used as a gpu cache, pixels (width, height). /// The GPU cache will dynamically quadruple in size whenever the current size /// is insufficient. /// /// Defaults to `(256, 256)` pub fn initial_cache_size(mut self, size: (u32, u32)) -> Self { self.$inner = self.$inner.initial_cache_size(size); self } /// Sets the maximum allowed difference in scale used for judging whether to reuse an /// existing glyph in the GPU cache. /// /// Defaults to `0.5` /// /// See rusttype docs for `rusttype::gpu_cache::Cache` pub fn gpu_cache_scale_tolerance(mut self, tolerance: f32) -> Self { self.$inner = self.$inner.gpu_cache_scale_tolerance(tolerance); self } /// Sets the maximum allowed difference in subpixel position used for judging whether /// to reuse an existing glyph in the GPU cache. Anything greater than or equal to /// 1.0 means "don't care". /// /// Defaults to `0.1` /// /// See rusttype docs for `rusttype::gpu_cache::Cache` pub fn gpu_cache_position_tolerance(mut self, tolerance: f32) -> Self { self.$inner = self.$inner.gpu_cache_position_tolerance(tolerance); self } /// Sets whether perform the calculation of glyph positioning according to the layout /// every time, or use a cached result if the input `Section` and `GlyphPositioner` are the /// same hash as a previous call. /// /// Improves performance. Should only disable if using a custom GlyphPositioner that is /// impure according to it's inputs, so caching a previous call is not desired. Disabling /// also disables [`cache_glyph_drawing`](#method.cache_glyph_drawing). /// /// Defaults to `true` pub fn cache_glyph_positioning(mut self, cache: bool) -> Self { self.$inner = self.$inner.cache_glyph_positioning(cache); self } /// Sets optimising drawing by reusing the last draw requesting an identical draw queue. /// /// Improves performance. Is disabled if /// [`cache_glyph_positioning`](#method.cache_glyph_positioning) is disabled. /// /// Defaults to `true` pub fn cache_glyph_drawing(mut self, cache: bool) -> Self { self.$inner = self.$inner.cache_glyph_drawing(cache); self } } }