* reorganize GlyphCache::get_or_insert() to use the HashMap entry API
* change DrawGlyphs::hint() parameter name from `yes` to `hint` for clarity
* change Layout::path_data() to return bytes instead of [f32; 2]. Path segments could be encoded as i16, making this incorrect
* make SimpleText::add_run accept glyph_transform and style parameters so it doesn't unconditionally do oblique strokes
* replace fill/stroke methods on DrawGlyphs with a single draw method that accepts either fill or stroke styles
* update peniko rev to access the new style types used above
* for now, change glyph cache to only cache non-zero fills. Prior to this, style was ignored in the key which could lead to incorrect rendering.
This fixes an incorrect application of the inverse transform for radial gradients in fine.
Also fixes an edge case in `SceneBuilder` where a brush transform is identical to the path transform leading to a corrupt encoding.
* Add counts to offsets when comparing against buffer size limits
* Remove multiplication by 4 in blend buffer allocation (we use units of u32)
* Move buffer sizes from BumpAllocators to Config
* Add comments about early exit
* remove area clamp in fine (now in #241)
* make DrawTag::info_size() const fn
* document DrawColor rgba field
* change Monoid type parameter to an associated type and describe the additional Default constraint
* consistent parens in PathTag::is_subpath_end
* add comments for 32-bit path segment types in PathTag
* also adds low level encoding functions for the three currently supported brushes
This exposes significantly more of the previously internal encoding guts.
This is beneficial for its own sake as there always seem to be new and interesting things that are supported by the encoding and GPU pipeline that are not directly exposed by the scene builder.
The secondary purpose is laying the groundwork for scene *de*coding and processing. This will enable us to implement various stages of the pipeline on the CPU.
