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Enable display MULTI_THREADED_PRESENT capability #109

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Enable display MULTI_THREADED_PRESENT capability #109

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21 changes: 13 additions & 8 deletions hwc2_device/HwcDisplay.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -623,15 +623,16 @@ HWC2::Error HwcDisplay::PresentDisplay(int32_t *out_present_fence) {
struct timespec vsync {};
clock_gettime(CLOCK_MONOTONIC, &vsync);
int64_t timestamp = (int64_t)vsync.tv_sec * kOneSecondNs + (int64_t)vsync.tv_nsec;
int64_t half_period = (1E9 / staged_mode_->v_refresh()) / 2;
if ((expectedPresentTime_->timestampNanos - timestamp) > half_period) {
int64_t sleep_ms = (expectedPresentTime_->timestampNanos - timestamp - half_period) / (1000 * 1000);

int64_t period = (1E9 / staged_mode_->v_refresh());
if ((expectedPresentTime_->timestampNanos - timestamp) > period) {
ATRACE_NAME("Wait for expected present time");
int64_t sleep_ms = (expectedPresentTime_->timestampNanos - timestamp - period) / (1000 * 1000);
std::this_thread::sleep_for(std::chrono::milliseconds(sleep_ms));
}
expectedPresentTime_ = std::nullopt;
} else {
std::this_thread::sleep_for(std::chrono::nanoseconds((int64_t)(1E9 / staged_mode_->v_refresh()) / 2));
}
}

if (IsInHeadlessMode()) {
*out_present_fence = -1;
return HWC2::Error::None;
Expand Down Expand Up @@ -957,12 +958,16 @@ HWC2::Error HwcDisplay::GetDisplayIdentificationData(uint8_t *outPort,
}

HWC2::Error HwcDisplay::GetDisplayCapabilities(uint32_t *outNumCapabilities,
uint32_t * /*outCapabilities*/) {
uint32_t * outCapabilities) {
if (outNumCapabilities == nullptr) {
return HWC2::Error::BadParameter;
}

*outNumCapabilities = 0;
*outNumCapabilities = 1;

if (outCapabilities != nullptr) {
outCapabilities[0] = 8;
}

return HWC2::Error::None;
}
Expand Down