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feat(l1): Home pages slide sideways, the page pill glides along

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DisplayDriver gains slideBegin()/slideCompose(): the driver keeps the frame
on screen and, in the next one, moves it out while the new rows follow.
SH1106 does it on its 1 KB buffer (+1 KB RAM for the copy), the sim on its
canvas; drivers that can't read their frame back keep cutting over (e-ink).

Home slides the content below the page-icon row in 220 ms with an ease-out
(the whole screen to and from the header-less clock), and the current-page
pill glides between icons.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-10-01 23:08:40 +02:00
co-authored by Claude Opus 5.5
parent 608231ed6b
commit 061e5ba36b
5 changed files with 124 additions and 12 deletions
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variants/sim/SimDisplayDriver.h
+22
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@@ -356,6 +356,28 @@ public:
// codepoint and call getTextWidth() on it.
uint16_t getCodepointWidth(uint32_t cp) override;
// The canvas is the frame (128x64 native, CSS-scaled), so the slide reads
// it back: the kept rows now, the new ones at compose time.
bool slideBegin(int y0) override {
EM_ASM({
if (!Module.__simCtx) return;
Module.__simSlideY = $0;
Module.__simSlide = Module.__simCtx.getImageData(0, $0, 128, 64 - $0);
}, y0);
return true;
}
void slideCompose(int dx) override {
EM_ASM({
var c = Module.__simCtx;
var old = Module.__simSlide;
if (!c || !old) return;
var y = Module.__simSlideY;
var fresh = c.getImageData(0, y, 128, 64 - y);
c.putImageData(old, -$0, y);
c.putImageData(fresh, $0 >= 0 ? 128 - $0 : -128 - $0, y);
}, dx);
}
// Every draw call above already lands directly on the visible canvas
// (see the class comment) -- nothing left to flush.
void endFrame() override { }