nya

hui-painter/src/lib.rs

@@ -2,12 +2,13 @@ pub mod paint;
 pub mod texture;
 pub mod text;
 
+use text::FontManager;
 use texture::TextureAtlas;
 
 #[derive(Default)]
 pub struct Painter {
-  pub(crate) atlas: TextureAtlas,
-  // ftm: FontTextureManager,
+  pub atlas: TextureAtlas,
+  pub fonts: FontManager,
 }
 
 impl Painter {
@@ -15,7 +16,19 @@ impl Painter {
     Self::default()
   }
 
-  pub fn atlas(&self) -> &TextureAtlas {
-    &self.atlas
-  }
+  // pub fn atlas(&self) -> &TextureAtlas {
+  //   &self.atlas
+  // }
+
+  // pub fn atlas_mut(&mut self) -> &mut TextureAtlas {
+  //   &mut self.atlas
+  // }
+
+  // pub fn fonts(&self) -> &FontManager {
+  //   &self.fonts
+  // }
+
+  // pub fn fonts_mut(&mut self) -> &mut FontManager {
+  //   &mut self.fonts
+  // }
 }

hui-painter/src/paint/command.rs

@@ -1,5 +1,9 @@
+use glam::Vec2;
 use crate::{paint::buffer::PaintBuffer, Painter};
 
+// mod root;
+// pub use root::RootCommand;
+
 mod transform;
 pub use transform::PaintTransform;
 
@@ -10,5 +14,20 @@ mod text;
 pub use text::PaintText;
 
 pub trait PaintCommand {
+  /// Called before actual paint command is executed\
+  /// Opportunity to pre-cache bitmaps, etc.
+  ///
+  /// Make sure to propagate this call to children!
+  #[allow(unused_variables)]
+  fn pre_paint(&self, ctx: &mut Painter) {}
+
+  /// Paint the command into the buffer
+  ///
+  /// Do not allocate new textures or cache glyphs here, use `pre_paint` instead!\
+  /// (Doing this WILL lead to atlas corruption flicker for a single frame if it's forced to resize!)
   fn paint(&self, ctx: &mut Painter, into: &mut PaintBuffer);
 }
+
+pub trait Measurable: PaintCommand {
+  fn size(&self, ctx: &Painter) -> Vec2;
+}

hui-painter/src/paint/command/text.rs

@@ -1,16 +1,20 @@
 use std::{borrow::Cow, sync::Arc};
-use fontdue::layout::{CoordinateSystem, Layout};
+use fontdue::layout::{self, CoordinateSystem, GlyphRasterConfig, Layout};
+use glam::{vec2, Vec2};
 use crate::{
-  Painter,
   paint::{
     buffer::PaintBuffer,
     command::PaintCommand,
-  },
+  }, text::FontHandle, Painter
 };
 
+use super::Measurable;
+
+// TODO align, multichunk etc
+
 pub struct TextChunk {
   pub text: Cow<'static, str>,
-  pub font: (),
+  pub font: FontHandle,
   pub size: f32,
 }
 
@@ -20,25 +24,74 @@ pub struct PaintText {
 }
 
 impl PaintText {
-  pub fn new(text: impl Into<Cow<'static, str>>, size: f32) -> Self {
+  pub fn new(text: impl Into<Cow<'static, str>>, font: FontHandle, size: f32) -> Self {
     Self {
       text: TextChunk {
         text: text.into(),
-        font: todo!(),
+        font,
         size,
       }
     }
   }
+
+  fn build_font_array<'a>(&self, ctx: &'a Painter) -> Vec<&'a fontdue::Font> {
+    let font = ctx.fonts.get_fontdue_font(self.text.font)
+      .expect("FontHandle is invalid");
+    vec![&font]
+  }
+
+  fn build_layout(&self, font_array: &[&fontdue::Font]) -> Layout {
+    let mut layout = Layout::new(CoordinateSystem::PositiveYDown);
+    layout.append(
+      &font_array,
+      &fontdue::layout::TextStyle::new(
+        &self.text.text,
+        self.text.size,
+        0
+      )
+    );
+    layout
+  }
 }
 
 impl PaintCommand for PaintText {
+  fn pre_paint(&self, ctx: &mut Painter) {
+    let font_array = self.build_font_array(ctx);
+    let layout = self.build_layout(&font_array);
+
+    for glyph in layout.glyphs() {
+      ctx.fonts.render_glyph(&mut ctx.atlas, self.text.font, glyph.key);
+    }
+  }
+
   fn paint(&self, ctx: &mut Painter, into: &mut PaintBuffer) {
-    // let mut layout = Layout::new(CoordinateSystem::PositiveYDown);
-    // layout.append(
-    //   &[text_renderer.internal_font(*font_handle)],
-    //   &TextStyle::new(text, *size as f32, 0)
-    // );
+    // let font_array = self.build_font_array(ctx);
+    // let layout = self.build_layout(&font_array);
+
+    // for glyph in layout.glyphs() {
+    //   let config = GlyphRasterConfig {
+    //     glyph_index: glyph.font_index
+    //   };
+    //   let glyph_raster = ctx.fonts().render_glyph(atlas, font, config);
+    // }
 
     todo!()
   }
 }
+
+impl Measurable for PaintText {
+  fn size(&self, ctx: &Painter) -> Vec2 {
+    let font_array = self.build_font_array(ctx);
+    let layout = self.build_layout(&font_array);
+
+    let width = layout.lines().map(|lines| {
+      lines.iter().fold(0.0_f32, |acc, x| {
+        let glyph = layout.glyphs().get(x.glyph_end).unwrap();
+        acc.max(glyph.x + glyph.width as f32)
+      })
+    }).unwrap_or(0.);
+    let height = layout.height();
+
+    vec2(width, height)
+  }
+}

hui-painter/src/paint/command/transform.rs

@@ -12,6 +12,12 @@ pub struct PaintTransform {
 }
 
 impl PaintCommand for PaintTransform {
+  fn pre_paint(&self, ctx: &mut Painter) {
+    for child in &self.children {
+      child.pre_paint(ctx);
+    }
+  }
+
   fn paint(&self, ctx: &mut Painter, into: &mut PaintBuffer) {
     // remember the starting index
     let starting_index = into.vertices.len();

hui-painter/src/text.rs

@@ -1,2 +1,69 @@
-pub mod ftm;
-pub mod font;
+use fontdue::layout::GlyphRasterConfig;
+use crate::texture::{TextureAtlas, TextureHandle};
+
+pub(crate) mod ftm;
+pub(crate) mod font;
+
+pub use font::FontHandle;
+
+pub struct FontManager {
+  fonts: font::FontHandleManager,
+  ftm: ftm::FontTextureManager,
+}
+
+impl FontManager {
+  pub fn new() -> Self {
+    Self {
+      fonts: font::FontHandleManager::new(),
+      ftm: ftm::FontTextureManager::new(),
+    }
+  }
+
+  /// Add a font to the manager.
+  ///
+  /// Panics:
+  /// - If the font data is invalid.
+  pub fn add_font(&mut self, data: &[u8]) -> FontHandle {
+    let font = self.fonts.add_font(data);
+    self.ftm.init_font(font);
+    font
+  }
+
+  /// Remove and deallocate a font from the manager.
+  ///
+  /// Panics:
+  /// - If the font handle is invalid.
+  pub fn remove_font(&mut self, font: FontHandle, atlas: &mut TextureAtlas) {
+    self.ftm.drop_font(font, atlas);
+    self.fonts.remove_font(font);
+  }
+
+  /// Render a glyph and cache it in the texture atlas.
+  ///
+  /// Panics:
+  /// - If the font handle is invalid or not initialized.
+  /// - Fuck around and find out, this api is unstable
+  pub(crate) fn render_glyph(
+    &mut self,
+    atlas: &mut TextureAtlas,
+    font: FontHandle,
+    config: GlyphRasterConfig
+  ) -> TextureHandle {
+    self.ftm.render_glyph(font, &self.fonts, config, atlas)
+  }
+
+  /// Internal API
+  pub(crate) fn get_fontdue_font(
+    &self,
+    handle: FontHandle
+  ) -> Option<&fontdue::Font> {
+    self.fonts.get_font_repr(handle)
+      .map(|x| &x.font)
+  }
+}
+
+impl Default for FontManager {
+  fn default() -> Self {
+    Self::new()
+  }
+}

hui-painter/src/text/font.rs

@@ -0,0 +1,52 @@
+use hashbrown::HashMap;
+use nohash_hasher::BuildNoHashHasher;
+
+pub(crate) type FontId = u16;
+
+#[derive(Clone, Copy)]
+pub struct FontHandle(pub(crate) FontId);
+
+pub(crate) struct FontRepr {
+  pub(crate) font: fontdue::Font,
+}
+
+pub struct FontHandleManager {
+  idc: FontId,
+  fonts: HashMap<FontId, FontRepr,BuildNoHashHasher<FontId>>,
+}
+
+impl FontHandleManager {
+  pub fn new() -> Self {
+    Self {
+      idc: 0,
+      fonts: HashMap::default(),
+    }
+  }
+
+  /// Add a font to the manager.
+  ///
+  /// Panics:
+  /// - If the font data is invalid.
+  pub fn add_font(&mut self, data: &[u8]) -> FontHandle {
+    let font = fontdue::Font::from_bytes(data, fontdue::FontSettings::default()).unwrap();
+    self.fonts.insert_unique_unchecked(self.idc, FontRepr { font });
+    self.idc += 1;
+    FontHandle(self.idc - 1)
+  }
+
+  /// Internal function
+  ///
+  /// Remove and deallocate a font from the manager if the font handle is valid.
+  ///
+  /// Panics:
+  /// - If the font handle is invalid.
+  pub(crate) fn remove_font(&mut self, handle: FontHandle) {
+    self.fonts.remove(&handle.0).unwrap();
+  }
+
+  /// Get the font handle for the specified font.
+  pub(crate) fn get_font_repr(&self, handle: FontHandle) -> Option<&FontRepr> {
+    self.fonts.get(&handle.0)
+  }
+}
+

hui-painter/src/text/ftm.rs

@@ -1,22 +1,19 @@
 use fontdue::layout::GlyphRasterConfig;
 use hashbrown::HashMap;
 use nohash_hasher::BuildNoHashHasher;
-use crate::texture::{TextureAtlas, TextureHandle};
-
-type FontId = u16;
-
-#[derive(Clone, Copy)]
-pub struct FontHandle(FontId);
+use crate::texture::{SourceTextureFormat, TextureAtlas, TextureHandle};
+use super::font::{FontHandle, FontHandleManager, FontId};
 
 /// Maps to the actual texture handle.
-struct GlyphCacheItem {
+struct RasterizedGlyphInternal {
   handle: TextureHandle,
+  metrics: fontdue::Metrics,
 }
 
 /// Map from raster config to glyph cache item.
 ///
 /// Partitioned by font id in FtM :3
-type PartitionKey = HashMap<GlyphRasterConfig, GlyphCacheItem>;
+type PartitionKey = HashMap<GlyphRasterConfig, RasterizedGlyphInternal>;
 
 /// Manages glyph cache items in a texture atlas.
 pub struct FontTextureManager {
@@ -24,17 +21,74 @@ pub struct FontTextureManager {
 }
 
 impl FontTextureManager {
+  pub fn new() -> Self {
+    Self {
+      partition: HashMap::default(),
+    }
+  }
+
   /// Drop cached data for the specified font.
   ///
   /// Panics:
-  /// - If the font handle is invalid.
+  /// - If the font handle is invalid or not initialized.
   /// - If any of the cached items are not found in the texture atlas or became invalid.\
   ///   This may happen if, for example, a different atlas is passed than the one used to allocate the items.
-  fn drop_font(&mut self, font: FontHandle, atlas: &mut TextureAtlas) {
+  pub(crate) fn drop_font(&mut self, font: FontHandle, atlas: &mut TextureAtlas) {
     let dump = self.partition.remove(&font.0).expect("Font handle is invalid");
     for (_, item) in dump {
       atlas.deallocate(item.handle);
     }
   }
+
+  /// Initialize the partition for the specified font.
+  ///
+  /// Panics:
+  /// - If the partition for the font already exists.
+  pub(crate) fn init_font(&mut self, font: FontHandle) {
+    assert!(!self.partition.contains_key(&font.0), "Font handle already initialized");
+    self.partition.insert_unique_unchecked(font.0, HashMap::default());
+  }
+
+  /// Render a glyph and cache it in the texture atlas.
+  ///
+  /// Panics:
+  /// - If the font handle is invalid or not initialized.
+  /// - Fuck around and find out, this api is unstable
+  pub(crate) fn render_glyph(
+    &mut self,
+    font_handle: FontHandle,
+    fhm_internal: &FontHandleManager,
+    config: GlyphRasterConfig,
+    atlas: &mut TextureAtlas
+  ) -> TextureHandle {
+    // Get partiton
+    let partition = self.partition.get_mut(&font_handle.0)
+      .expect("Font handle is not registered in FtM");
+
+    // Check if glyph is alr cached
+    if let Some(item) = partition.get(&config) {
+      return item.handle;
+    }
+
+    // Get fontdue font from the manager
+    let font = &fhm_internal.get_font_repr(font_handle)
+      .expect("Font handle is invalid")
+      .font;
+
+    // Rasterize the font and copy the texture data
+    let (metrics, data) = font.rasterize_config(config);
+    let handle = atlas.allocate_with_data(SourceTextureFormat::A8, &data, metrics.width);
+
+    // Create a texture item struct and insert it into the partition
+    let itm = RasterizedGlyphInternal { handle, metrics };
+    partition.insert_unique_unchecked(config, itm);
+
+    return handle;
+  }
 }
 
+impl Default for FontTextureManager {
+  fn default() -> Self {
+    Self::new()
+  }
+}