B1: femtovg Canvas::set_size queues SetRenderTarget(Screen) without
updating current_render_target — the scene set_render_target() was
silently undone and the Copy blit overwrote the frame with the empty
persistent texture (black window on the first env-gated frame).
Root-fixed in vendored femtovg (keep the field in sync with the queued
command — upstream-able) + re-assert the scene target after the
notifier block's set_size.
B2: BoxShadow/Transform/Opacity/Layer/Clip bypass the proxy's
filter_item and re-render every frame (core item_rendering.rs:209-217)
— with a multi-rect dirty region they re-blended over uncleared pixels
in the gaps between rects (progressive smear). Collapse the dirty
region to its single bounding rect so filter, scissor and clears all
agree on one rect.
M1: visualize outline now strokes on the swapchain after the blit
(drawn into the persistent texture it accumulated).
Also: case-insensitive env parsing; stale-comment corrections.
km
Vendor femtovg 0.23.2 with a targeted patch: the swash raster path can
fail to scale some variable fonts at a non-default variation instance
(the CFF2-based CJK system fonts on modern macOS), and femtovg cached
those glyphs as permanently missing — so track titles and any other
text at medium/semibold/bold weight rendered blank for CJK while
regular weight (empty coords) worked. render_glyph now retries the
glyph at the font's default instance before giving up: worst case the
glyph draws at regular weight instead of not at all. Fonts and
instances that already render are untouched.
Fixes#543
cc
vicrodh