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[backends/hwcomposer] Handle OutputInterfaces in Backend

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Allows to read the DPI information and export the physical display
size from it. DPI is scaled by 1000 in hwcomposer, split by X and Y,
which allows to calculate size in mm from pixel size.
This commit is contained in:
Martin Gräßlin 2015-05-08 19:38:12 +00:00
parent af134dbbda
commit 1f62c0acb0
1 changed files with 34 additions and 6 deletions
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40
backends/hwcomposer/hwcomposer_backend.cpp
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@ -21,6 +21,11 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "hwcomposer_backend.h"
#include "logging.h"
#include "screens_hwcomposer.h"
#include "wayland_server.h"
// KWayland
#include <KWayland/Server/display.h>
#include <KWayland/Server/output_interface.h>
// hybris/android
#include <hardware/hardware.h>
#include <hardware/hwcomposer.h>
@ -32,6 +37,7 @@ namespace KWin
HwcomposerBackend::HwcomposerBackend(QObject *parent)
: AbstractBackend(parent)
{
handleOutputs();
}
HwcomposerBackend::~HwcomposerBackend()
@ -41,23 +47,44 @@ HwcomposerBackend::~HwcomposerBackend()
}
}
static QSize getDisplaySize(hwc_composer_device_1_t *device)
static KWayland::Server::OutputInterface *createOutput(hwc_composer_device_1_t *device)
{
uint32_t configs[5];
size_t numConfigs = 5;
if (device->getDisplayConfigs(device, 0, configs, &numConfigs) != 0) {
qCWarning(KWIN_HWCOMPOSER) << "Failed to get hwcomposer display configurations";
return QSize();
return nullptr;
}
int32_t attr_values[2];
int32_t attr_values[4];
uint32_t attributes[] = {
HWC_DISPLAY_WIDTH,
HWC_DISPLAY_HEIGHT,
HWC_DISPLAY_DPI_X,
HWC_DISPLAY_DPI_Y,
HWC_DISPLAY_NO_ATTRIBUTE
};
device->getDisplayAttributes(device, 0, configs[0], attributes, attr_values);
return QSize(attr_values[0], attr_values[1]);
QSize pixel(attr_values[0], attr_values[1]);
if (pixel.isEmpty()) {
return nullptr;
}
using namespace KWayland::Server;
OutputInterface *o = waylandServer()->display()->createOutput(waylandServer()->display());
// TODO: get refresh rate
o->addMode(pixel, OutputInterface::ModeFlag::Current | OutputInterface::ModeFlag::Preferred);
if (attr_values[2] != 0 && attr_values[3] != 0) {
static const qreal factor = 25.4;
o->setPhysicalSize(QSizeF(qreal(pixel.width() * 1000) / qreal(attr_values[2]) * factor,
qreal(pixel.height() * 1000) / qreal(attr_values[3]) * factor).toSize());
} else {
// couldn't read physical size, assume 96 dpi
o->setPhysicalSize(pixel / 3.8);
}
o->create();
return o;
}
void HwcomposerBackend::init()
@ -80,11 +107,12 @@ void HwcomposerBackend::init()
hwcDevice->blank(hwcDevice, 0, 0);
// get display configuration
m_displaySize = getDisplaySize(hwcDevice);
if (!m_displaySize.isValid()) {
auto output = createOutput(hwcDevice);
if (!output) {
emit initFailed();
return;
}
m_displaySize = output->pixelSize();
qCDebug(KWIN_HWCOMPOSER) << "Display size:" << m_displaySize;
m_device = hwcDevice;