G5: lapis, 0x4200.cafe's manuscript, as a theme with its ornament

A native theme `lapis` (src/themes/lapis.zig) from web/theme/lapis.css:
a lapis-deep page, lapis tags with gold names, vellum text, vermilion
rubrics, gold rules and a vermilion tag rule, gold selection in lapis ink.
Its ornament is the theme's new `decor` (colors.Decor), drawn by a pixel
shell inside the chrome it already has (decision 1), all of it off every
focus indicator:

- page_dots: the site's gold dot grid (#e8c46a22, 22 px), drawn by the
  cell shader on page-coloured cells alone (flag 0x10000000), so it lies
  under the text and never under a selection, a tag or the cursor; fixed
  to the window, a page the panes lie on.
- rail_checker: the dither frame's gold and lapis checker in the scroll
  track (a decor kind, flag 0x08000000), anchored to its rail; the thumb
  stays solid gold.
- tag plaques (tag_border, tag_shadow, tag_stripe): every tag a raised
  plaque inside its own band, the site's trail: a 2px gold frame and a
  hard 5px vermilion shadow down and right, both within the band's rows
  and columns (down, what the slack under the text leaves), so no shadow
  reaches a body, a grip or the next pane. The focused pane's plaque is
  the code window's title bar, gold and lapis stripes of 2px, its words
  on plates of the focused ground; unfocused ones are plain; column and
  workspace tags take the object-label language (1px frame, 2px shadow
  toward the page). Drawn as decor under the cells (a group's under
  range), with blank tag cells see-through and the cells blended
  premultiplied (pipeline_over) on such frames; opaque windows only.
- title_shadow: the titles' vermilion offset shadow under a file name's
  letters, sampled in the cell shader inside the letters' own cells (flag
  0x08000000), none on a cursor.

Chrome carries the decor (decor_*, name_ink, active_name_ink); a theme
file folds a nested decor literal field by field. Left out, with why, in
docs/effects.md: the fonts, the ornaments, a decor crossfade, and in the
tty anything but the colours (a tag row has no spare cell for a shadow).
An empty column is the page. The effect id is masked to 27 bits (ui.vert/ui.frag) for the
fifth flag.

Tests: the cell flags land only on page ground and file-name cells, never
a cursor, nothing without decor; lapis's plaques stay inside their tag's
band, clear of every grip, only the focused one striped; its checker is in
the track; no other theme draws any; the separator and focus
tests cover lapis. Goldens: theme and themesel (the ring gains lapis after
acme). Gates as G4. Feel review: .scratch/render/lapis/ (lapis.png, lapis-2x.png,
tags-focused-vs-unfocused-2x.png, a PanelSlide at 60 fps and a quarter).

1 files changed, 17 insertions, 0 deletions

diff --git a/src/draw.zig b/src/draw.zig
index b8cf4e7d..5f14ae21 100644
--- a/src/draw.zig
+++ b/src/draw.zig
@@ -470,7 +470,24 @@ pub fn render(p: *Pardes, arena: std.mem.Allocator) !*Surface {
         .grip_dirty = boxDirty(p),
         .tag_rule = p.theme().tag_rule,
         .rail_px = @intCast(@min(255, @as(u32, p.theme().rail_px orelse 12) * p.settings.grip_width / 100)),
+        .name_ink = chrome.tag_name_fg,
+        .active_name_ink = if (p.settings.focus_tint) chrome.tag_active_name_fg else chrome.tag_name_fg,
     };
+    if (p.theme().decor) |decor| {
+        s.chrome.decor_dots = decor.page_dots;
+        s.chrome.decor_dot_alpha = decor.page_dot_alpha;
+        s.chrome.decor_dot_px = decor.page_dot_px;
+        s.chrome.decor_checker = decor.rail_checker;
+        s.chrome.decor_checker_px = decor.rail_checker_px;
+        s.chrome.decor_box_border = decor.tag_border;
+        s.chrome.decor_box_border_px = decor.tag_border_px;
+        s.chrome.decor_box_shadow = decor.tag_shadow;
+        s.chrome.decor_box_shadow_px = decor.tag_shadow_px;
+        s.chrome.decor_box_stripe = decor.tag_stripe;
+        s.chrome.decor_box_stripe_px = decor.tag_stripe_px;
+        s.chrome.decor_title = decor.title_shadow;
+        s.chrome.decor_title_px = decor.title_shadow_px;
+    }
     place(p, s);
     // Separators have their own role; a scrollbar need not frame the page.
     const whole = s.regions[0].rect;