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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.gui.QPictureIO
public class QPictureIO
This class is obsolete. It is provided to keep old source code working. We strongly advise against using it in new code.
The QPictureIO class contains parameters for loading and saving pictures.
QPictureIO contains a QIODevice object that is used for picture data I/O. The programmer can install new picture file formats in addition to those that Qt provides.
You don't normally need to use this class; QPicture::load(), QPicture::save().
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Constructor Summary | |
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QPictureIO()
Constructs a QPictureIO object with all parameters set to zero. |
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QPictureIO(QIODevice ioDevice,
java.lang.String format)
Constructs a QPictureIO object with the I/O device ioDevice and a format tag. |
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QPictureIO(java.lang.String fileName,
java.lang.String format)
Constructs a QPictureIO object with the file name fileName and a format tag. |
Method Summary | |
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java.lang.String |
description()
Returns the picture description string. |
java.lang.String |
fileName()
Returns the file name currently set. |
java.lang.String |
format()
Returns the picture format string or null if no format has been explicitly set. |
static QPictureIO |
fromNativePointer(QNativePointer nativePointer)
This function returns the QPictureIO instance pointed to by nativePointer |
float |
gamma()
Returns the gamma value at which the picture will be viewed. |
static java.util.List<QByteArray> |
inputFormats()
Returns a sorted list of picture formats that are supported for picture input. |
QIODevice |
ioDevice()
Returns the IO device currently set. |
static java.util.List<QByteArray> |
outputFormats()
Returns a sorted list of picture formats that are supported for picture output. |
java.lang.String |
parameters()
Returns the picture's parameters string. |
QPicture |
picture()
Returns the picture currently set. |
static QByteArray |
pictureFormat(QIODevice arg__1)
Returns a string that specifies the picture format of the picture read from IO device arg__1, or 0 if the device cannot be read or if the format is not recognized. |
static QByteArray |
pictureFormat(java.lang.String fileName)
Returns a string that specifies the picture format of the file fileName, or null if the file cannot be read or if the format is not recognized. |
int |
quality()
Returns the quality of the written picture, related to the compression ratio. |
boolean |
read()
Reads an picture into memory and returns true if the picture was successfully read; otherwise returns false. |
void |
setDescription(java.lang.String arg__1)
Sets the picture description string for picture handlers that support picture descriptions to arg__1. |
void |
setFileName(java.lang.String arg__1)
Sets the name of the file to read or write an picture from to arg__1. |
void |
setFormat(java.lang.String format)
Sets the picture format to format for the picture to be read or written. |
void |
setGamma(float arg__1)
Sets the gamma value at which the picture will be viewed to arg__1. |
void |
setIODevice(QIODevice arg__1)
Sets the IO device to be used for reading or writing an picture. |
void |
setParameters(java.lang.String parameters)
Sets the picture's parameter string to parameters. |
void |
setPicture(QPicture arg__1)
Sets the picture to arg__1. |
void |
setQuality(int arg__1)
Sets the quality of the written picture to arg__1, related to the compression ratio. |
void |
setStatus(int arg__1)
Sets the picture IO status to arg__1. |
int |
status()
Returns the picture's IO status. |
boolean |
write()
Writes an picture to an IO device and returns true if the picture was successfully written; otherwise returns false. |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QPictureIO()
Constructs a QPictureIO object with all parameters set to zero.
public QPictureIO(QIODevice ioDevice, java.lang.String format)
public QPictureIO(java.lang.String fileName, java.lang.String format)
Method Detail |
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public final java.lang.String description()
Returns the picture description string.
public final java.lang.String fileName()
Returns the file name currently set.
public final float gamma()
Returns the gamma value at which the picture will be viewed.
public final QIODevice ioDevice()
Returns the IO device currently set.
public final QPicture picture()
Returns the picture currently set.
public final int quality()
Returns the quality of the written picture, related to the compression ratio.
public final boolean read()
Reads an picture into memory and returns true if the picture was successfully read; otherwise returns false.
Before reading an picture you must set an IO device or a file name. If both an IO device and a file name have been set, the IO device will be used.
Setting the picture file format string is optional.
Note that this function does not set the format used to read the picture. If you need that information, use the pictureFormat static functions.
Example:
QPictureIO iio;
QPixmap pixmap;
iio.setFileName("vegeburger.pic");
if (iio.read()) { // OK
QPicture picture = iio.picture();
QPainter painter(&pixmap);
painter.drawPicture(0, 0, picture);
}
public final void setDescription(java.lang.String arg__1)
Sets the picture description string for picture handlers that support picture descriptions to arg__1.
Currently, no picture format supported by Qt uses the description string.
public final void setFileName(java.lang.String arg__1)
Sets the name of the file to read or write an picture from to arg__1.
public final void setGamma(float arg__1)
Sets the gamma value at which the picture will be viewed to arg__1. If the picture format stores a gamma value for which the picture is intended to be used, then this setting will be used to modify the picture. Setting to 0.0 will disable gamma correction (i.e. any specification in the file will be ignored).
The default value is 0.0.
public final void setIODevice(QIODevice arg__1)
Sets the IO device to be used for reading or writing an picture.
Setting the IO device allows pictures to be read/written to any block-oriented QIODevice.
If arg__1 is not null, this IO device will override file name settings.
public final void setPicture(QPicture arg__1)
Sets the picture to arg__1.
public final void setQuality(int arg__1)
Sets the quality of the written picture to arg__1, related to the compression ratio.
arg__1 must be in the range -1..100. Specify 0 to obtain small compressed files, 100 for large uncompressed files. (-1 signifies the default compression.)
public final void setStatus(int arg__1)
Sets the picture IO status to arg__1. A non-zero value indicates an error, whereas 0 means that the IO operation was successful.
public final int status()
Returns the picture's IO status. A non-zero value indicates an error, whereas 0 means that the IO operation was successful.
public final boolean write()
Writes an picture to an IO device and returns true if the picture was successfully written; otherwise returns false.
Before writing an picture you must set an IO device or a file name. If both an IO device and a file name have been set, the IO device will be used.
The picture will be written using the specified picture format.
Example:
QPictureIO iio;
QPicture picture;
QPainter painter(&picture);
painter.drawPixmap(0, 0, pixmap);
iio.setPicture(picture);
iio.setFileName("vegeburger.pic");
iio.setFormat("PIC");
if (iio.write())
return true; // returned true if written successfully
public static java.util.List<QByteArray> inputFormats()
Returns a sorted list of picture formats that are supported for picture input.
public static java.util.List<QByteArray> outputFormats()
Returns a sorted list of picture formats that are supported for picture output.
public static QByteArray pictureFormat(java.lang.String fileName)
Returns a string that specifies the picture format of the file fileName, or null if the file cannot be read or if the format is not recognized.
public static QByteArray pictureFormat(QIODevice arg__1)
Returns a string that specifies the picture format of the picture read from IO device arg__1, or 0 if the device cannot be read or if the format is not recognized.
Make sure that arg__1 is at the right position in the device (for example, at the beginning of the file).
public static QPictureIO fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.public final java.lang.String format()
public final java.lang.String parameters()
public final void setFormat(java.lang.String format)
It is necessary to specify a format before writing an picture, but it is not necessary to specify a format before reading an picture.
If no format has been set, Qt guesses the picture format before reading it. If a format is set the picture will only be read if it has that format.
public final void setParameters(java.lang.String parameters)
Although the current picture formats supported by Qt ignore the parameters string, it may be used in future extensions or by contributions (for example, JPEG).
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