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Add async display refresh support to HalDisplay

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Introduces non-blocking refresh capability with displayBufferAsync() that starts panel waveform and returns immediately, plus waitRefreshComplete() to block until refresh finishes. Panels without async support fall back to blocking refresh. Requires framebuffer to remain untouched during refresh and differential baseline rebuild before next update.
This commit is contained in:
Justin Mitchell
2026-07-13 16:20:20 -04:00
parent bae29fc6ba
commit e66de575a1
6 changed files with 169 additions and 34 deletions
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lib/GfxRenderer/GfxRenderer.cpp
+14
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@@ -1411,6 +1411,20 @@ void GfxRenderer::displayBuffer(const HalDisplay::RefreshMode refreshMode) const
display.displayBuffer(refreshMode, fadingFix);
}
void GfxRenderer::displayBufferAsync(const HalDisplay::RefreshMode refreshMode) const {
// The async path has no turn-off-screen hook, which the sunlight fading fix
// relies on; keep those users on the blocking path.
if (fadingFix) {
display.displayBuffer(refreshMode, fadingFix);
return;
}
display.displayBufferAsync(refreshMode);
}
void GfxRenderer::waitRefreshComplete() const { display.waitRefreshComplete(); }
bool GfxRenderer::supportsAsyncRefresh() const { return !fadingFix && display.supportsAsyncRefresh(); }
std::string GfxRenderer::truncatedText(const int fontId, const char* text, const int maxWidth,
const EpdFontFamily::Style style) const {
if (!text || maxWidth <= 0) return "";