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Add async display refresh to overlap CPU work

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Introduces non-blocking display refresh methods that allow CPU work (like grayscale rendering) to overlap with the e-ink panel's refresh time. The async path starts the waveform and returns immediately, with the caller responsible for waiting via waitRefreshComplete(). Falls back to blocking refresh when fadingFix is enabled or the panel lacks deferral support.
This commit is contained in:
Justin Mitchell
2026-07-14 04:42:27 -04:00
parent 34e7ed249b
commit 17e4230068
6 changed files with 166 additions and 38 deletions
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lib/GfxRenderer/GfxRenderer.h
+11
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@@ -135,6 +135,17 @@ class GfxRenderer {
int getScreenWidth() const;
int getScreenHeight() const;
void displayBuffer(HalDisplay::RefreshMode refreshMode = HalDisplay::FAST_REFRESH) const;
// Non-blocking refresh: starts the waveform and returns so CPU work (e.g.
// grayscale strip rendering) can overlap the panel's refresh time. The
// framebuffer must stay untouched until waitRefreshComplete(). Falls back to
// a blocking refresh when fadingFix is enabled or the panel lacks deferral
// support. See HalDisplay::displayBufferAsync for the baseline contract.
void displayBufferAsync(HalDisplay::RefreshMode refreshMode = HalDisplay::FAST_REFRESH) const;
void waitRefreshComplete() const;
// True when displayBufferAsync() genuinely overlaps: panel defers and
// fadingFix isn't forcing the blocking path. Callers can skip overlap
// scaffolding (e.g. whole-plane grayscale buffers) when false.
bool supportsAsyncRefresh() const;
// EXPERIMENTAL: Windowed update - display only a rectangular region
// void displayWindow(int x, int y, int width, int height) const;
void invertScreen() const;