TQImageDecoder Class Reference
The TQImageDecoder class is an incremental image decoder for all supported image formats.
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#include <ntqasyncimageio.h>
List of all member functions.
Public Members
Static Public Members
Detailed Description
The TQImageDecoder class is an incremental image decoder for all supported image formats.
New formats are installed by creating objects of class
TQImageFormatType; the TQMovie class can be used for all installed
incremental image formats. TQImageDecoder is only useful for
creating new ways of feeding data to an TQImageConsumer.
A TQImageDecoder is a machine that decodes images. It takes encoded
image data via its decode() method and expresses its decoding by
supplying information to a TQImageConsumer. It implements its
decoding by using a TQImageFormat created by one of the
currently-existing TQImageFormatType factory objects.
TQImageFormatType and TQImageFormat are the classes that you might
need to implement support for additional image formats.
TQt supports GIF reading if it is configured that way during
installation (see ntqgif.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."
Warning: If you are in a country that recognizes software patents
and in which Unisys holds a patent on LZW compression and/or
decompression and you want to use GIF, Unisys may require you to
license that technology. Such countries include Canada, Japan,
the USA, France, Germany, Italy and the UK.
GIF support may be removed completely in a future version of TQt.
We recommend using the MNG or PNG format.
See also Graphics Classes, Image Processing Classes, and Multimedia Classes.
Member Function Documentation
TQImageDecoder::TQImageDecoder ( TQImageConsumer * c )
Constructs a TQImageDecoder that will send change information to
the TQImageConsumer c.
TQImageDecoder::~TQImageDecoder ()
Destroys a TQImageDecoder. 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 TQImageDecoder::decode ( const uchar * buffer, int length )
Call this function to decode some data into image changes. The
data in buffer will be decoded, sending change information to
the TQImageConsumer of this TQImageDecoder until one of the change
functions of the consumer returns FALSE. The length of the data is
given in length.
Returns the number of bytes consumed: 0 if consumption is
complete, and -1 if decoding fails due to invalid data.
TQImageFormatType * TQImageDecoder::format ( const char * name ) [static]
Returns a TQImageFormatType by name. This might be used when the
user needs to force data to be interpreted as being in a certain
format. name is one of the formats listed by
TQImageDecoder::inputFormats(). Note that you will still need to
supply decodable data to result->decoderFor() before you can begin
decoding the data.
const char * TQImageDecoder::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. The function
will look at the first length characters in the buffer.
Returns 0 if the format is not recognized.
const TQImage & TQImageDecoder::image ()
Returns the image currently being decoded.
TQStrList TQImageDecoder::inputFormats () [static]
Returns a sorted list of formats for which asynchronous loading is
supported.
void TQImageDecoder::registerDecoderFactory ( TQImageFormatType * f ) [static]
Registers the new TQImageFormatType f. This is not needed in
application code because factories call this themselves.
void TQImageDecoder::unregisterDecoderFactory ( TQImageFormatType * f ) [static]
Unregisters the TQImageFormatType f. This is not needed in
application code because factories call this themselves.
This file is part of the TQt toolkit.
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