Renderer: Fine-granular Canvas Update

[Myriad-Dreamin]

Proposal 3, Renderer: Fine-granular Canvas Update

Break the canvas into small pieces and update them individually to shorten E2E latency.

To finish the task we need to implement the following function:

  pub struct OpaqueCanvasState;
  pub fn update_canvas(&self, state: OpaqueCanvasState, 
    canvas: web_sys::CanvasRenderingContext2d, frame: &typst::doc::Frame) -> OpaqueCanvasState;

• [ ] add proposal draft
• [x] create crate
• [x] copy code from raster image
• [x] replace by browser api
  • [x] replace rust fn image::Image::new by canvas image rendering api
  • [x] replace rust fnresvg::render by canvas svg rendering api
  • [x] replace rust fnttf_parser::Face::outline_glyph by unknown api, possible fill
  • [x] replace sk::Path/Stroke operations by canvas api
  • [x] apply clip semantics by canvas.clip
  • [x] replace render_svg_glyph by canvas.fill(path)
  • [x] replace render_bitmap_glyph by canvas.drawImageData(bitmap)
  • [x] antialias, dash pattern
• [ ] design OpaqueCanvasState

[Myriad-Dreamin]

Implemented all features