QImageDecoder(3qt)QImageDecoder(3qt)NAME
QImageDecoder - Incremental image decoder for all
supported image formats
#include <qasyncimageio.h>
Public Members
QImageDecoder ( QImageConsumer * c )
~QImageDecoder ()
const QImage& image ()
int decode ( const uchar * buffer, int length )
Static Public Members
const char* formatName ( const uchar * buffer, int length
)
QImageFormatType* format ( const char * name )
QStrList inputFormats ()
void registerDecoderFactory ( QImageFormatType * )
void unregisterDecoderFactory ( QImageFormatType * )
DESCRIPTION
Incremental image decoder for all supported image formats.
New formats are installed by creating objects of class
QImageFormatType, and the QMovie class can be used for
using all installed incremental image formats;
QImageDecoder is only useful for creating new ways of
feeding data to an QImageConsumer.
Qt supports GIF reading, if it is configured that way
during installation (see qgif.h). If it is, we are
required to state that" The Graphics Interchange Format(c)
is the Copyright property of CompuServe Incorporated.
GIF(sm) is a Service Mark property of CompuServe
Incorporated.".
MEMBER FUNCTION DOCUMENTATIONQImageDecoder::QImageDecoder ( QImageConsumer * c )
Constructs a QImageDecoder which will send change
information to a given QImageConsumer.
QImageDecoder::~QImageDecoder ()
Destroys a QImageDecoder. The image it built is destroyed.
The decoder built by the factory for the file format is
destroyed. The consumer for which it decoded the image is
not destroyed.
int QImageDecoder::decode ( const uchar * buffer, int length )
Call this function to decode some data into image changes.
The data will be decoded, sending change information to
the QImageConsumer of this QImageDecoder, until one of the
change functions of the consumer returns FALSE.
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QImageDecoder(3qt)QImageDecoder(3qt)
Returns the number of bytes consumed, 0 if consumption is
complete, and -1 if decoding fails due to invalid data.
QImageFormatType* QImageDecoder::format ( const char * name )
[static]
Returns a QImageFormatType by name. This might be used in
cases where the user needs to force data to be interpreted
as being in a certain format. name is one of the formats
listed by QImageDecoder::inputFormats(). Note that you
will still need to supply decodable data to
result->decoderFor() before you can begin decoding the
data.
const char* QImageDecoder::formatName ( const uchar * buffer, int
length ) [static]
Call this function to find the name of the format of the
given header. The returned string is statically allocated.
Returns 0 if the format is not recognized.
const QImage& QImageDecoder::image ()
Returns the image currently being decoded.
QStrList QImageDecoder::inputFormats () [static]
Returns a sorted list of formats for which asynchronous
loading is supported.
void QImageDecoder::registerDecoderFactory ( QImageFormatType * f
) [static]
Registers a new QImageFormatType. This is not needed in
application code as factories call this themselves.
void QImageDecoder::unregisterDecoderFactory ( QImageFormatType *
f ) [static]
Unregisters a new QImageFormatType. This is not needed in
application code as factories call this themselves.
SEE ALSO
http://doc.trolltech.com/qimagedecoder.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports
make our job much simpler. Thank you.
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QImageDecoder(3qt)QImageDecoder(3qt)
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Please include the name of the manual page
(qimagedecoder.3qt) and the Qt version (2.3.1).
Trolltech AS 13 June 2001 3
