#include <icl/exifimagedisplayext.h>
| class MExifImageDisplayExtension : public MImageDisplayPluginExtension |
| Public Member Functions | |
|---|---|
| pure virtual TInt | GetExifMetadataReader(MExifMetadataReader *&) |
| pure virtual TInt | SetMaximumReductionFactor(TInt) |
| pure virtual TInt | SetScaleQuality(TInt) |
| Inherited Functions | |
|---|---|
| MImageDisplayPluginExtension::Release() | |
| MImageDisplayPluginExtension::Uid()const | |
This class extends the functionality of the Image Display Library client API defined in the class CImageDisplay. This extension is supported only by the EXIF-specific framework plug-ins. In order to invoke the extended functionality, the user needs to call the CImageDisplay::ExtensionInterface( ) with the KExifImageDisplayExtensionUid interface UID and an interface pointer to the object of this class.
| TInt | GetExifMetadataReader | ( | MExifMetadataReader *& | aPtr | ) | [pure virtual] |
Obtains an MExifMetadataReader that can be used to access the EXIF metadata of the image.
| Parameters | |
|---|---|
| aPtr | A reference to a pointer to the MExifMetadataReader that can be used to access the EXIF metadata of the image. |
Sets the maximum quality reduction factor for image decoding. By default, the plug-in calculates an optimal maximum reduction factor and uses it to produce a series of roughly-decoded images, passing each of them to the observer interface with the CImageDisplayPlugin::EStatusPartialFrame flag set. Note: This function must be called before calling CImageDisplay::Play().
| Parameters | |
|---|---|
| aMaxReductionFactor | The maximum quality reduction factor. Usually the maximum reduction can be specfied in range of 0-3. A value of 0 means no quality reduction is allowed, so a full-quality image will be decoded as the first frame. A value of 1 means (1/2)^1=1/2 of the original image quality. A value of 3 means (1/2)^3=1/8 of the original image quality. If the reduction factor is not set by calling this function then the reduction factor value of 3 is used for jpeg images. |
Sets the level of quality for the scaling algorithm. If quality level is not set by calling this function then the fastest/lowest quality algorithm is used. Note: This function must be called before calling CImageDisplay::Play()
| Parameters | |
|---|---|
| aQualityLevel | Quality level value for the scaling algorithm. See CBitmapScaler::TQualityAlgorithm for a set of possible values. |