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[backends/hwcomposer] Add a failsafe timer for vsync events

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Apparently we don't get a vsync event for the first frame during startup
which blocks the compositor till the end of days. Thus a timer is added
which calls vsync after 1 sec if we didn't get an event.
This commit is contained in:
Martin Gräßlin 2015-10-16 18:19:10 +02:00
parent 801e60b290
commit 70e744fe26
2 changed files with 11 additions and 0 deletions
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8
backends/hwcomposer/hwcomposer_backend.cpp
View file

@ -28,6 +28,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <KWayland/Server/display.h>
#include <KWayland/Server/output_interface.h>
#include <KWayland/Server/seat_interface.h>
// Qt
#include <QTimer>
// hybris/android
#include <hardware/hardware.h>
#include <hardware/hwcomposer.h>
@ -41,8 +43,12 @@ namespace KWin
HwcomposerBackend::HwcomposerBackend(QObject *parent)
: AbstractBackend(parent)
, m_vsyncFailSafeTimer(new QTimer(this))
{
handleOutputs();
m_vsyncFailSafeTimer->setSingleShot(true);
m_vsyncFailSafeTimer->setInterval(1000);
connect(m_vsyncFailSafeTimer, &QTimer::timeout, this, &HwcomposerBackend::vsync);
}
HwcomposerBackend::~HwcomposerBackend()
@ -192,12 +198,14 @@ void HwcomposerBackend::present()
}
m_pageFlipPending = true;
if (Compositor::self()) {
m_vsyncFailSafeTimer->start();
Compositor::self()->aboutToSwapBuffers();
}
}
void HwcomposerBackend::vsync()
{
m_vsyncFailSafeTimer->stop();
if (m_pageFlipPending) {
m_pageFlipPending = false;
if (Compositor::self()) {

3
backends/hwcomposer/hwcomposer_backend.h
View file

@ -32,6 +32,8 @@ typedef struct hwc_composer_device_1 hwc_composer_device_1_t;
class HWComposerNativeWindowBuffer;
class QTimer;
namespace KWin
{
@ -76,6 +78,7 @@ private:
bool m_outputBlank = true;
bool m_pageFlipPending = false;
int m_refreshRate = 60000;
QTimer *m_vsyncFailSafeTimer;
};
class HwcomposerWindow : public HWComposerNativeWindow