Un-trait ScriptAbi + runtime shared FontStore (closes #15)
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@ -22,7 +22,7 @@ pub fn make_default_backend() -> anyhow::Result<Box<dyn Backend>> {
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/// A WebAssembly runtime backend.
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pub trait Backend {
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fn load_module(&self, module: &[u8]) -> anyhow::Result<Arc<dyn Instance>>;
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fn load_module(&self, abi: ScriptAbi, module: &[u8]) -> anyhow::Result<Arc<dyn Instance>>;
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}
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/// An instance of a WebAssembly module.
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@ -59,3 +59,101 @@ pub trait Instance {
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fn on_message(&self, panel_ud: u32, msg: Vec<u8>);
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}
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#[derive(Default)]
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pub struct ScriptAbi {
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draw_cmds: Mutex<Vec<DrawCommand>>,
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font_store: Arc<text::FontStore>,
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font_families: Mutex<HashMap<String, u32>>,
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loaded_fonts: RwLock<Vec<Arc<text::Font>>>,
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text_layouts: RwLock<Slab<text::TextLayout>>,
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message_store: RwLock<Slab<Vec<u8>>>,
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}
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impl ScriptAbi {
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pub fn new(font_store: Arc<text::FontStore>) -> Self {
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Self {
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font_store,
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..Default::default()
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}
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}
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pub fn start_draw(&self) {
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let mut lock = self.draw_cmds.lock();
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lock.clear();
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}
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pub fn draw_indexed(&self, vertices: &[MeshVertex], indices: &[MeshIndex]) {
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self.draw_cmds.lock().push(DrawCommand::Mesh {
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vertices: vertices.to_vec(),
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indices: indices.to_vec(),
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})
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}
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pub fn draw_text_layout(&self, id: u32, offset: Vec2, scale: f32, color: Color) {
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// TODO multiple fonts per layout
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let layouts = self.text_layouts.read();
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let layout = layouts.get(id as usize).unwrap();
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let glyphs = layout.glyphs.as_slice();
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let loaded = self.loaded_fonts.read();
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let font = loaded.get(layout.font_id as usize).unwrap();
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let cmds = font.draw(glyphs, offset, scale, color);
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self.draw_cmds.lock().extend(cmds.into_iter());
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}
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pub fn with_draw_commands(&self, f: impl FnOnce(&[DrawCommand])) {
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f(self.draw_cmds.lock().as_slice());
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}
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pub fn font_load(&self, family: &str) -> u32 {
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let mut family_cache = self.font_families.lock();
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if let Some(cached) = family_cache.get(family) {
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return *cached;
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}
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let font = self.font_store.load_font(family);
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let mut loaded = self.loaded_fonts.write();
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let id = loaded.len() as u32;
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family_cache.insert(family.to_string(), id);
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loaded.push(font);
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id
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}
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pub fn text_layout_new(&self, font_id: u32, text: &str) -> u32 {
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let loaded = self.loaded_fonts.read();
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let font = loaded.get(font_id as usize).unwrap();
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let layout = font.shape(text);
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self.text_layouts.write().insert(layout) as u32
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}
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pub fn text_layout_delete(&self, id: u32) {
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self.text_layouts.write().remove(id as usize);
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}
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pub fn text_layout_get_bounds(&self, id: u32, dst: &mut Rect) {
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let src = self.text_layouts.read().get(id as usize).unwrap().bounds;
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let _ = std::mem::replace(dst, src);
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}
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pub fn message_new(&self, data: Vec<u8>) -> u32 {
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let mut store = self.message_store.write();
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let id = store.insert(data) as u32;
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id
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}
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pub fn message_free(&self, id: u32) {
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let mut store = self.message_store.write();
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store.remove(id as usize);
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}
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pub fn message_get_len(&self, id: u32) -> u32 {
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self.message_store.read().get(id as usize).unwrap().len() as u32
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}
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pub fn message_get_data(&self, id: u32, dst: &mut [u8]) {
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let store = self.message_store.read();
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let src = store.get(id as usize).unwrap();
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dst.copy_from_slice(src);
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}
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}
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@ -3,15 +3,15 @@
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use std::ops::DerefMut;
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use super::{Arc, Backend, Instance, PanelId};
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use crate::{DrawCommand, ScriptAbi, ScriptAbiImpl};
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use super::{Arc, Backend, Instance, PanelId, ScriptAbi};
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use crate::DrawCommand;
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use canary_script::{Color, CursorEventKind, Rect, Vec2};
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use parking_lot::Mutex;
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type Caller<'a> = wasmtime::Caller<'a, ScriptAbiImpl>;
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type Store = wasmtime::Store<ScriptAbiImpl>;
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type Linker = wasmtime::Linker<ScriptAbiImpl>;
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type Caller<'a> = wasmtime::Caller<'a, ScriptAbi>;
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type Store = wasmtime::Store<ScriptAbi>;
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type Linker = wasmtime::Linker<ScriptAbi>;
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pub struct WasmtimeBackend {
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engine: wasmtime::Engine,
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@ -30,9 +30,8 @@ impl WasmtimeBackend {
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}
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impl Backend for WasmtimeBackend {
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fn load_module(&self, module: &[u8]) -> anyhow::Result<Arc<dyn Instance>> {
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fn load_module(&self, abi: ScriptAbi, module: &[u8]) -> anyhow::Result<Arc<dyn Instance>> {
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let module = wasmtime::Module::new(&self.engine, module)?;
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let abi = ScriptAbiImpl::default();
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let mut store = wasmtime::Store::new(&self.engine, abi);
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let mut linker = Linker::new(&self.engine);
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WasmtimeInstance::link(&mut linker)?;
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126
src/lib.rs
126
src/lib.rs
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@ -10,20 +10,26 @@ use std::sync::Arc;
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pub mod backend;
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pub mod text;
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use backend::{Backend, Instance};
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use backend::{Backend, Instance, ScriptAbi};
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use text::FontStore;
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/// The main interface to Canary.
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pub struct Runtime {
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backend: Box<dyn Backend>,
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font_store: Arc<FontStore>,
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}
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impl Runtime {
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pub fn new(backend: Box<dyn Backend>) -> anyhow::Result<Self> {
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Ok(Self { backend })
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Ok(Self {
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backend,
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font_store: Arc::new(FontStore::new()),
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})
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}
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pub fn load_module(&self, module: &[u8]) -> anyhow::Result<Script> {
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let instance = self.backend.load_module(module)?;
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let abi = ScriptAbi::new(self.font_store.to_owned());
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let instance = self.backend.load_module(abi, module)?;
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Ok(Script {
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instance,
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@ -83,28 +89,6 @@ impl Panel {
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/// Proportion constant between pixels (at 96dpi) to millimeters (Canary's unit measurement).
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pub const PX_PER_MM: f32 = 25.4 / 96.0;
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/// Low-level script API callbacks.
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///
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/// If you're a casual user of Canary the struct you're looking for is
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/// [ScriptAbiImpl]. This trait exists to help with making mocks for testing.
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pub trait ScriptAbi {
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fn start_draw(&self);
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fn draw_indexed(&self, vertices: &[MeshVertex], indices: &[MeshIndex]);
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fn draw_text_layout(&self, id: u32, offset: Vec2, scale: f32, color: Color);
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fn with_draw_commands(&self, f: impl FnOnce(&[DrawCommand]));
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fn font_load(&self, family: &str) -> u32;
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fn text_layout_new(&self, font_id: u32, text: &str) -> u32;
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fn text_layout_delete(&self, id: u32);
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fn text_layout_get_bounds(&self, id: u32, rect: &mut Rect);
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fn message_new(&self, data: Vec<u8>) -> u32;
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fn message_free(&self, id: u32);
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fn message_get_len(&self, id: u32) -> u32;
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fn message_get_data(&self, id: u32, dst: &mut [u8]);
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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pub struct PanelId(pub(crate) usize);
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@ -116,95 +100,3 @@ pub enum DrawCommand {
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indices: Vec<MeshIndex>,
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},
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}
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/// The standard [ScriptAbi] implementation to use.
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#[derive(Default)]
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pub struct ScriptAbiImpl {
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draw_cmds: Mutex<Vec<DrawCommand>>,
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font_store: text::FontStore,
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font_families: Mutex<HashMap<String, u32>>,
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loaded_fonts: RwLock<Vec<Arc<text::Font>>>,
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text_layouts: RwLock<Slab<text::TextLayout>>,
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message_store: RwLock<Slab<Vec<u8>>>,
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}
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impl ScriptAbi for ScriptAbiImpl {
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fn start_draw(&self) {
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let mut lock = self.draw_cmds.lock();
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lock.clear();
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}
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fn draw_indexed(&self, vertices: &[MeshVertex], indices: &[MeshIndex]) {
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self.draw_cmds.lock().push(DrawCommand::Mesh {
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vertices: vertices.to_vec(),
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indices: indices.to_vec(),
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})
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}
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fn draw_text_layout(&self, id: u32, offset: Vec2, scale: f32, color: Color) {
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// TODO multiple fonts per layout
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let layouts = self.text_layouts.read();
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let layout = layouts.get(id as usize).unwrap();
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let glyphs = layout.glyphs.as_slice();
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let loaded = self.loaded_fonts.read();
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let font = loaded.get(layout.font_id as usize).unwrap();
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let cmds = font.draw(glyphs, offset, scale, color);
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self.draw_cmds.lock().extend(cmds.into_iter());
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}
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fn with_draw_commands(&self, f: impl FnOnce(&[DrawCommand])) {
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f(self.draw_cmds.lock().as_slice());
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}
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fn font_load(&self, family: &str) -> u32 {
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let mut family_cache = self.font_families.lock();
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if let Some(cached) = family_cache.get(family) {
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return *cached;
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}
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let font = self.font_store.load_font(family);
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let mut loaded = self.loaded_fonts.write();
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let id = loaded.len() as u32;
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family_cache.insert(family.to_string(), id);
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loaded.push(font);
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id
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}
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fn text_layout_new(&self, font_id: u32, text: &str) -> u32 {
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let loaded = self.loaded_fonts.read();
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let font = loaded.get(font_id as usize).unwrap();
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let layout = font.shape(text);
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self.text_layouts.write().insert(layout) as u32
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}
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fn text_layout_delete(&self, id: u32) {
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self.text_layouts.write().remove(id as usize);
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}
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fn text_layout_get_bounds(&self, id: u32, dst: &mut Rect) {
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let src = self.text_layouts.read().get(id as usize).unwrap().bounds;
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let _ = std::mem::replace(dst, src);
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}
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fn message_new(&self, data: Vec<u8>) -> u32 {
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let mut store = self.message_store.write();
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let id = store.insert(data) as u32;
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id
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}
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fn message_free(&self, id: u32) {
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let mut store = self.message_store.write();
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store.remove(id as usize);
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}
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fn message_get_len(&self, id: u32) -> u32 {
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self.message_store.read().get(id as usize).unwrap().len() as u32
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}
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fn message_get_data(&self, id: u32, dst: &mut [u8]) {
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let store = self.message_store.read();
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let src = store.get(id as usize).unwrap();
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dst.copy_from_slice(src);
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}
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}
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