Exports cubes into one of several formats with Qt facilities. More...

#include <QtExporter.h>

Inheritance diagram for Isis::QtExporter:

Collaboration diagram for Isis::QtExporter:

Public Member Functions
	QtExporter (QString format)
	Construct the Qt exporter.

virtual	~QtExporter ()
	Destruct the exporter.

virtual void	setGrayscale (ExportDescription &desc)
	Set the input with the description generically, check the data size for a single-band image with the established dimensions, initialize the image with the Indexed8 format, and setup the color table from 0 to 256.

virtual void	setRgb (ExportDescription &desc)
	Set the input with the description generically, check the data size for a three-band image with the established dimensions, and initialize the image with the RGB32 format.

virtual void	setRgba (ExportDescription &desc)
	Set the input with the description generically, check the data size for a four-band image with the established dimensions, and initialize the image with the ARGB32 format.

virtual void	write (FileName outputName, int quality=100)
	Let the base ImageExporter handle the generic black-box writing routine, then save the image to disk.

void	operator() (vector< Buffer * > &in) const
	The method for writing a line of input image data (with potentially several bands representing color channels) to the output image.

int	samples () const
	Number of samples (columns) in the output image.

int	lines () const
	Number of lines (rows) in the output image.

int	bands () const
	Number of bands (channels) in the output image.

double	inputMinimum (int channel) const
	Returns the input minimum for the given channel.

double	inputMaximum (int channel) const
	Returns the input maximum for the given channel.

void	setOutputPixelRange (double outputPixelMinimum, double outputPixelMaximum)
	Set the DN floor and ceiling for the exported image.

Static Public Member Functions
static bool	canWriteFormat (QString format)
	Returns true if the format is supported by QImageWriter.

static ImageExporter *	fromFormat (QString format)
	A static (factory) method for constructing an ImageExporter instance from an output format.

Protected Types
typedef void(ImageExporter::*	WriteChannels )(vector< Buffer * > &in) const
	Friendly alias for a method used to write a particular color channel.

Protected Member Functions
virtual void	writeGrayscale (vector< Buffer * > &in) const
	Write a line of grayscale data to the output image.

virtual void	writeRgb (vector< Buffer * > &in) const
	Write a line of RGB data to the output image.

virtual void	writeRgba (vector< Buffer * > &in) const
	Write a line of RGBA data to the output image.

void	checkDataSize (BigInt samples, BigInt lines, int bands)
	Checks that the data size for an image of the desired dimensions will be less than 2GB.

void	setExtension (QString extension)
	Sets the extension for the output image and generates the extension for the world file from it.

void	setExportDescription (ExportDescription &desc)
	Sets the description for the output image.

Cube *	initializeProcess ()
	Sets up the export process with the parameters described within the given description.

QString	extension () const
	Gets the extension for the output image.

ExportDescription &	exportDescription () const
	Gets the description for the output image.

ProcessExport &	process () const
	Get a reference to the process object, useful for subclasses to access and manipulate the process.

PixelType	pixelType () const
	Returns the pixel type.

virtual int	outputPixelValue (double dn) const
	Return the output clamped integer pixel value from the input double-precision DN.

Private Member Functions
void	initialize (ExportDescription &desc)
	Generic initialization with the export description.

Private Attributes
QImage *	m_qimage
	Structure holding all output image data in memory.

QString	m_format
	The lowercase abbreviated format of the output image.

Detailed Description

Exports cubes into one of several formats with Qt facilities.

Takes a series of single-banded Isis cubes and exports them into one of several possible standard image formats using Qt's QImage structure to handle reading the data into memory and setting individual pixel values. Set Qt's documentation on QImageWriter for a complete list of supported formats:

http://qt-project.org/doc/qt-4.8/qimagewriter.html#supportedImageFormats

While Qt can be used to export Isis cubes to TIFF images, it is generally recommended to use the TiffExporter class instead, which uses LibTIFF version 4 to import big TIFFs. Qt, as of version 4.8, can only import images <2GB in size.

Author: 2012-04-03 Travis Addair

History:

2012-04-04 Travis Addair - Added documentation.

2013-06-05 Jeannie Backer - Added initialize() method and replaced call to setInput(). Changed ImageExporter calls to new method names, where needed. References #1380.

Definition at line 61 of file QtExporter.h.

Member Typedef Documentation

typedef void(ImageExporter::* Isis::ImageExporter::WriteChannels)(vector< Buffer * > &in) const

protectedinherited

Friendly alias for a method used to write a particular color channel.

Definition at line 111 of file ImageExporter.h.

Constructor & Destructor Documentation

Isis::QtExporter::QtExporter ( QString format )

Construct the Qt exporter.

Parameters

format The format to export to

Definition at line 21 of file QtExporter.cpp.

References m_format, m_qimage, and Isis::ImageExporter::setExtension().

Isis::QtExporter::~QtExporter ( )

virtual

Destruct the exporter.

Definition at line 42 of file QtExporter.cpp.

References m_qimage.

Member Function Documentation

int Isis::ImageExporter::bands ( ) const

inherited

Number of bands (channels) in the output image.

Returns: The depth of the output

Definition at line 128 of file ImageExporter.cpp.

Referenced by checkDataSize(), Isis::JP2Exporter::createBuffer(), Isis::TiffExporter::createBuffer(), Isis::TiffExporter::setBuffer(), Isis::JP2Exporter::write(), and Isis::TiffExporter::write().

bool Isis::QtExporter::canWriteFormat ( QString format )

static

Returns true if the format is supported by QImageWriter.

Parameters

format Lowercase format abbreviation

Returns: True if supported in Qt, false otherwise

Definition at line 236 of file QtExporter.cpp.

Referenced by Isis::ImageExporter::fromFormat().

void Isis::QtExporter::checkDataSize	(	BigInt	samples,
		BigInt	lines,
		int	bands
	)

protected

Checks that the data size for an image of the desired dimensions will be less than 2GB.

Parameters

samples	Number of samples in the output
lines	Number of lines in the output
bands	Number of bands in the output

Definition at line 215 of file QtExporter.cpp.

References _FILEINFO_, Isis::ImageExporter::bands(), Isis::toString(), and Isis::IException::User.

Referenced by setGrayscale(), setRgb(), and setRgba().

ExportDescription & Isis::ImageExporter::exportDescription ( ) const

protectedinherited

Gets the description for the output image.

Returns: The export description

Definition at line 216 of file ImageExporter.cpp.

QString Isis::ImageExporter::extension ( ) const

protectedinherited

Gets the extension for the output image.

Returns: The extension for the output image

Definition at line 198 of file ImageExporter.cpp.

ImageExporter * Isis::ImageExporter::fromFormat ( QString format )

staticinherited

A static (factory) method for constructing an ImageExporter instance from an output format.

The specific subclass of the returned instance is determined from the desired output image format provided. Each subclass has knowledge of whether or not it can write a particular format. Because the ability to export an image format is not mutually exclusive amongst exporters, the order of condieration here matters. For example, using a TIFF exporter takes precedence over a Qt exporter for TIFF images, because the former can process cubes greater than 2GB while the latter cannot. It is the caller's responsibility to delete the exporter instance when they are finished with it.

Parameters

format The format for the output image to be created

Returns: A pointer to the instantiated exporter owned by the caller

Definition at line 380 of file ImageExporter.cpp.

References _FILEINFO_, Isis::JP2Exporter::canWriteFormat(), Isis::TiffExporter::canWriteFormat(), canWriteFormat(), and Isis::IException::Programmer.

void Isis::QtExporter::initialize ( ExportDescription & desc )

privatevirtual

Generic initialization with the export description.

Set the input and set the pixel type.

Parameters

desc	Export description containing necessary channel information

Implements Isis::ImageExporter.

Definition at line 53 of file QtExporter.cpp.

References _FILEINFO_, Isis::ImageExporter::initialize(), m_format, Isis::ExportDescription::pixelType(), and Isis::IException::Unknown.

Referenced by setGrayscale(), setRgb(), and setRgba().

Cube * Isis::ImageExporter::initializeProcess ( )

protectedinherited

Sets up the export process with the parameters described within the given description.

This method determines determines whether to write the data as grayscale, RGB, or RGBA. It then opens a cube for retrieving the input data and establishing the dimensions of the output image. Next, the ProcessExport format is set to BIL and the ProcessExport output pixel type, output valid data range, and output null are set based on the given export description. Last, the absolute output pixel range is set based on the given description (this is the smallest and largest allowed pixel values in the output, including "special" pixel values).

Returns: A cube pointer to the first channel created, owned by the process

Definition at line 236 of file ImageExporter.cpp.

References _FILEINFO_, Isis::ProcessExport::BIL, Isis::Cube::lineCount(), Isis::IException::Programmer, Isis::Cube::sampleCount(), Isis::ProcessExport::setFormat(), Isis::ProcessExport::SetOutputNull(), Isis::ProcessExport::SetOutputRange(), Isis::ProcessExport::SetOutputType(), Isis::ImageExporter::writeGrayscale(), Isis::ImageExporter::writeRgb(), and Isis::ImageExporter::writeRgba().

double Isis::ImageExporter::inputMaximum ( int channel ) const

inherited

Returns the input maximum for the given channel.

Any value of max in the input cube will be mapped to the output max of the output channel.

Parameters

channel Index of the channel within the process

Returns: The maximum DN in the input mapped to the maximum of the output

Definition at line 154 of file ImageExporter.cpp.

double Isis::ImageExporter::inputMinimum ( int channel ) const

inherited

Returns the input minimum for the given channel.

Any value of min in the input cube will be mapped to the output min of the output channel.

Parameters

channel Index of the channel within the process

Returns: The minimum DN in the input mapped to the minimum of the output

Definition at line 141 of file ImageExporter.cpp.

int Isis::ImageExporter::lines ( ) const

inherited

Number of lines (rows) in the output image.

Returns: The height of the output

Definition at line 118 of file ImageExporter.cpp.

Referenced by setGrayscale(), setRgb(), setRgba(), Isis::JP2Exporter::write(), and Isis::TiffExporter::write().

void Isis::ImageExporter::operator() ( vector< Buffer * > & in ) const

inherited

The method for writing a line of input image data (with potentially several bands representing color channels) to the output image.

It is called for each line of data in the input images (provides a vector containing the same line from each single-band input image). Enables the exporter to be used as a functor in a custom ProcessExport routine, bypassing the black-box write() method entirely.

Parameters

in	Vector containing a line of input data from each input channel

Definition at line 78 of file ImageExporter.cpp.

int Isis::ImageExporter::outputPixelValue ( double dn ) const

protectedvirtualinherited

Return the output clamped integer pixel value from the input double-precision DN.

Parameters

dn	The input DN

Returns: The pixel value for the output

Definition at line 315 of file ImageExporter.cpp.

Referenced by Isis::StreamExporter::writeGrayscale(), writeGrayscale(), Isis::StreamExporter::writeRgb(), writeRgb(), Isis::StreamExporter::writeRgba(), and writeRgba().

PixelType Isis::ImageExporter::pixelType ( ) const

protectedinherited

Returns the pixel type.

Defaults to None if not set by the user.

Returns: The pixel type: {None, UnsignedByte, SignedWord, UnsignedWord}

Definition at line 297 of file ImageExporter.cpp.

Referenced by Isis::JP2Exporter::createBuffer(), Isis::TiffExporter::createBuffer(), Isis::JP2Exporter::setBuffer(), Isis::TiffExporter::setBuffer(), Isis::JP2Exporter::write(), Isis::TiffExporter::write(), and Isis::JP2Exporter::writeLine().

ProcessExport & Isis::ImageExporter::process ( ) const

protectedinherited

Get a reference to the process object, useful for subclasses to access and manipulate the process.

Returns: A reference to the process object

Definition at line 287 of file ImageExporter.cpp.

int Isis::ImageExporter::samples ( ) const

inherited

Number of samples (columns) in the output image.

Returns: The width of the output

Definition at line 108 of file ImageExporter.cpp.

Referenced by Isis::JP2Exporter::createBuffer(), Isis::TiffExporter::createBuffer(), setGrayscale(), setRgb(), setRgba(), Isis::JP2Exporter::write(), and Isis::TiffExporter::write().

void Isis::ImageExporter::setExportDescription ( ExportDescription & desc )

protectedinherited

Sets the description for the output image.

Parameters

desc	The export description

Definition at line 207 of file ImageExporter.cpp.

void Isis::ImageExporter::setExtension ( QString extension )

protectedinherited

Sets the extension for the output image and generates the extension for the world file from it.

Parameters

extension The extension for the output image

Definition at line 183 of file ImageExporter.cpp.

Referenced by Isis::JP2Exporter::JP2Exporter(), QtExporter(), and Isis::TiffExporter::TiffExporter().

void Isis::QtExporter::setGrayscale ( ExportDescription & desc )

virtual

Set the input with the description generically, check the data size for a single-band image with the established dimensions, initialize the image with the Indexed8 format, and setup the color table from 0 to 256.

Parameters

desc	Export description containing necessary channel information

Implements Isis::ImageExporter.

Definition at line 71 of file QtExporter.cpp.

References checkDataSize(), initialize(), Isis::ImageExporter::lines(), m_qimage, and Isis::ImageExporter::samples().

void Isis::ImageExporter::setOutputPixelRange	(	double	outputPixelMinimum,
		double	outputPixelMaximum
	)

inherited

Set the DN floor and ceiling for the exported image.

All DNs less than the min will be set to the min in the exported image. Similarly, all DNs greater than the max will be set to the max in the exported image.

Note: These values may be "special". For example, if Null pixels are exported to 0.0 and the minimum valid pixels are exported to 2.0, then 0.0 should be passed in for the value of the min parameter.

Parameters

min	The absolute minimum output DN value.
max	The absolute maximum output DN value.

Definition at line 171 of file ImageExporter.cpp.

void Isis::QtExporter::setRgb ( ExportDescription & desc )

virtual

Set the input with the description generically, check the data size for a three-band image with the established dimensions, and initialize the image with the RGB32 format.

Parameters

desc	Export description containing necessary channel information

Implements Isis::ImageExporter.

Definition at line 93 of file QtExporter.cpp.

References checkDataSize(), initialize(), Isis::ImageExporter::lines(), m_qimage, and Isis::ImageExporter::samples().

void Isis::QtExporter::setRgba ( ExportDescription & desc )

virtual

Set the input with the description generically, check the data size for a four-band image with the established dimensions, and initialize the image with the ARGB32 format.

Parameters