QCameraExposure class provides interface for exposure related camera settings. 更多...
| 头： | #include <QCameraExposure> |
| qmake: | QT += multimedia |
| 继承： | QObject |
| enum | ExposureMode { ExposureAuto, ExposureManual, ExposurePortrait, ExposureNight, ..., ExposureModeVendor } |
| enum | FlashMode { FlashAuto, FlashOff, FlashOn, FlashRedEyeReduction, ..., FlashManual } |
| flags | FlashModes |
| enum | MeteringMode { MeteringMatrix, MeteringAverage, MeteringSpot } |
|
|
| qreal | aperture () const |
| qreal | exposureCompensation () const |
| ExposureMode | exposureMode () const |
| FlashModes | flashMode () const |
| bool | isAvailable () const |
| bool | isExposureModeSupported (ExposureMode mode ) const |
| bool | isFlashModeSupported (FlashModes mode ) const |
| bool | isFlashReady () const |
| bool | isMeteringModeSupported (MeteringMode mode ) const |
| int | isoSensitivity () const |
| MeteringMode | meteringMode () const |
| qreal | requestedAperture () const |
| int | requestedIsoSensitivity () const |
| qreal | requestedShutterSpeed () const |
| void | setSpotMeteringPoint (const QPointF & point ) |
| qreal | shutterSpeed () const |
| QPointF | spotMeteringPoint () const |
| QList<qreal> | supportedApertures (bool * continuous = Q_NULLPTR) const |
| QList<int> | supportedIsoSensitivities (bool * continuous = Q_NULLPTR) const |
| QList<qreal> | supportedShutterSpeeds (bool * continuous = Q_NULLPTR) const |
| void | setAutoAperture () |
| void | setAutoIsoSensitivity () |
| void | setAutoShutterSpeed () |
| void | setExposureCompensation (qreal ev ) |
| void | setExposureMode (ExposureMode mode ) |
| void | setFlashMode (FlashModes mode ) |
| void | setManualAperture (qreal aperture ) |
| void | setManualIsoSensitivity (int iso ) |
| void | setManualShutterSpeed (qreal seconds ) |
| void | setMeteringMode (MeteringMode mode ) |
| void | apertureChanged (qreal value ) |
| void | apertureRangeChanged () |
| void | exposureCompensationChanged (qreal value ) |
| void | flashReady (bool ready ) |
| void | isoSensitivityChanged (int value ) |
| void | shutterSpeedChanged (qreal speed ) |
| void | shutterSpeedRangeChanged () |
QCameraExposure class provides interface for exposure related camera settings.
| 常量 | 值 | 描述 |
|---|---|---|
QCameraExposure::ExposureAuto
|
0
|
自动模式。 |
QCameraExposure::ExposureManual
|
1
|
手动模式。 |
QCameraExposure::ExposurePortrait
|
2
|
肖象曝光模式。 |
QCameraExposure::ExposureNight
|
3
|
夜间模式。 |
QCameraExposure::ExposureBacklight
|
4
|
背光曝光模式。 |
QCameraExposure::ExposureSpotlight
|
5
|
聚光灯曝光模式。 |
QCameraExposure::ExposureSports
|
6
|
亮点曝光模式。 |
QCameraExposure::ExposureSnow
|
7
|
Snow exposure mode. |
QCameraExposure::ExposureBeach
|
8
|
Beach exposure mode. |
QCameraExposure::ExposureLargeAperture
|
9
|
Use larger aperture with small depth of field. |
QCameraExposure::ExposureSmallAperture
|
10
|
Use smaller aperture. |
QCameraExposure::ExposureAction
|
11
|
Action mode. Since 5.5 |
QCameraExposure::ExposureLandscape
|
12
|
Landscape mode. Since 5.5 |
QCameraExposure::ExposureNightPortrait
|
13
|
Night portrait mode. Since 5.5 |
QCameraExposure::ExposureTheatre
|
14
|
Theatre mode. Since 5.5 |
QCameraExposure::ExposureSunset
|
15
|
Sunset mode. Since 5.5 |
QCameraExposure::ExposureSteadyPhoto
|
16
|
Steady photo mode. Since 5.5 |
QCameraExposure::ExposureFireworks
|
17
|
Fireworks mode. Since 5.5 |
QCameraExposure::ExposureParty
|
18
|
Party mode. Since 5.5 |
QCameraExposure::ExposureCandlelight
|
19
|
Candlelight mode. Since 5.5 |
QCameraExposure::ExposureBarcode
|
20
|
Barcode mode. Since 5.5 |
QCameraExposure::ExposureModeVendor
|
1000
|
The base value for device specific exposure modes. |
| 常量 | 值 | 描述 |
|---|---|---|
QCameraExposure::FlashAuto
|
0x1
|
自动闪光。 |
QCameraExposure::FlashOff
|
0x2
|
Flash is Off. |
QCameraExposure::FlashOn
|
0x4
|
Flash is On. |
QCameraExposure::FlashRedEyeReduction
|
0x8
|
Red eye reduction flash. |
QCameraExposure::FlashFill
|
0x10
|
Use flash to fillin shadows. |
QCameraExposure::FlashTorch
|
0x20
|
Constant light source. If supported, torch can be enabled without loading the camera. |
QCameraExposure::FlashVideoLight
|
0x40
|
Constant light source, useful for video capture. The light is turned on only while camera is active. |
QCameraExposure::FlashSlowSyncFrontCurtain
|
0x80
|
Use the flash in conjunction with a slow shutter speed. This mode allows better exposure of distant objects and/or motion blur effect. |
QCameraExposure::FlashSlowSyncRearCurtain
|
0x100
|
The similar mode to FlashSlowSyncFrontCurtain but flash is fired at the end of exposure. |
QCameraExposure::FlashManual
|
0x200
|
Flash power is manualy set. |
The FlashModes type is a typedef for QFlags <FlashMode>. It stores an OR combination of FlashMode values.
| 常量 | 值 | 描述 |
|---|---|---|
QCameraExposure::MeteringMatrix
|
1
|
Matrix metering mode. |
QCameraExposure::MeteringAverage
|
2
|
Center weighted average metering mode. |
QCameraExposure::MeteringSpot
|
3
|
Spot metering mode. |
Lens aperture is specified as an F number, the ratio of the focal length to effective aperture diameter.
访问函数：
| qreal | aperture () const |
通知程序信号：
| void | apertureChanged (qreal value ) |
另请参阅 supportedApertures (), setAutoAperture (), setManualAperture ()，和 requestedAperture ().
Exposure compensation in EV units.
Exposure compensation property allows to adjust the automatically calculated exposure.
访问函数：
| qreal | exposureCompensation () const |
| void | setExposureCompensation (qreal ev ) |
通知程序信号：
| void | exposureCompensationChanged (qreal value ) |
This property holds the exposure mode being used.
访问函数：
| ExposureMode | exposureMode () const |
| void | setExposureMode (ExposureMode mode ) |
另请参阅 QCameraExposure::isExposureModeSupported ().
This property holds the flash mode being used.
Usually the single QCameraExposure::FlashMode flag is used, but some non conflicting flags combination are also allowed, like QCameraExposure::FlashManual | QCameraExposure::FlashSlowSyncRearCurtain .
访问函数：
| FlashModes | flashMode () const |
| void | setFlashMode (FlashModes mode ) |
另请参阅 QCameraExposure::isFlashModeSupported () 和 QCameraExposure::isFlashReady ().
Indicates if the flash is charged and ready to use.
访问函数：
| bool | isFlashReady () const |
通知程序信号：
| void | flashReady (bool ready ) |
This property holds the sensor ISO sensitivity.
访问函数：
| int | isoSensitivity () const |
通知程序信号：
| void | isoSensitivityChanged (int value ) |
另请参阅 supportedIsoSensitivities (), setAutoIsoSensitivity ()，和 setManualIsoSensitivity ().
This property holds the metering mode being used.
访问函数：
| MeteringMode | meteringMode () const |
| void | setMeteringMode (MeteringMode mode ) |
另请参阅 QCameraExposure::isMeteringModeSupported ().
Camera's shutter speed in seconds.
访问函数：
| qreal | shutterSpeed () const |
通知程序信号：
| void | shutterSpeedChanged (qreal speed ) |
另请参阅 supportedShutterSpeeds (), setAutoShutterSpeed ()，和 setManualShutterSpeed ().
[signal]
void
QCameraExposure::
apertureChanged
(
qreal
value
)
Signal emitted when aperature changes to value .
注意： 通知程序信号对于特性 aperture .
[signal]
void
QCameraExposure::
apertureRangeChanged
()
Signal emitted when aperature range has changed.
[signal]
void
QCameraExposure::
exposureCompensationChanged
(
qreal
value
)
Signal emitted when the exposure compensation changes to value .
注意： 通知程序信号对于特性 exposureCompensation .
[signal]
void
QCameraExposure::
flashReady
(
bool
ready
)
Signal the flash ready status has changed.
注意： 通知程序信号对于特性 flashReady .
Returns true if exposure settings are supported by this camera.
Returns true if the exposure mode is supported.
Returns true if the flash mode is supported.
Returns true if flash is charged.
注意： Getter 函数对于特性 flashReady .
Returns true if the metering mode is supported.
[signal]
void
QCameraExposure::
isoSensitivityChanged
(
int
value
)
Signal emitted when sensitivity changes to value .
注意： 通知程序信号对于特性 isoSensitivity .
Returns the requested manual aperture or -1.0 if automatic aperture is turned on.
Returns the requested ISO sensitivity or -1 if automatic ISO is turned on.
Returns the requested manual shutter speed in seconds or -1.0 if automatic shutter speed is turned on.
[slot]
void
QCameraExposure::
setAutoAperture
()
Turn on auto aperture
[slot]
void
QCameraExposure::
setAutoIsoSensitivity
()
Turn on auto sensitivity
[slot]
void
QCameraExposure::
setAutoShutterSpeed
()
Turn on auto shutter speed
[slot]
void
QCameraExposure::
setManualAperture
(
qreal
aperture
)
Sets the manual camera aperture 值。
[slot]
void
QCameraExposure::
setManualIsoSensitivity
(
int
iso
)
Sets the manual sensitivity to iso
[slot]
void
QCameraExposure::
setManualShutterSpeed
(
qreal
seconds
)
Set the manual shutter speed to seconds
Allows setting the spot metering point to point .
另请参阅 spotMeteringPoint ().
Returns the current shutter speed in seconds.
注意： Getter 函数对于特性 shutterSpeed .
[signal]
void
QCameraExposure::
shutterSpeedChanged
(
qreal
speed
)
Signals that a camera's shutter speed 已改变。
注意： 通知程序信号对于特性 shutterSpeed .
[signal]
void
QCameraExposure::
shutterSpeedRangeChanged
()
Signal emitted when the shutter speed range has changed.
When supported, the spot metering point is the (normalized) position of the point of the image where exposure metering will be performed. This is typically used to indicate an "interesting" area of the image that should be exposed properly.
The coordinates are relative frame coordinates: QPointF (0,0) points to the left top frame point, QPointF (0.5,0.5) points to the frame center, which is typically the default spot metering point.
The spot metering point is only used with spot metering mode.
另请参阅 setSpotMeteringPoint ().
Returns the list of aperture values camera supports. The apertures list can change depending on the focal length, in such a case the apertureRangeChanged () 信号被发射。
If the camera supports arbitrary aperture values within the supported range, * continuous is set to true, otherwise * continuous 被设为 false。
Returns the list of ISO senitivities camera supports.
If the camera supports arbitrary ISO sensitivities within the supported range, * continuous is set to true, otherwise * continuous 被设为 false。
Returns the list of shutter speed values in seconds camera supports.
If the camera supports arbitrary shutter speed values within the supported range, * continuous is set to true, otherwise * continuous 被设为 false。