A holder for pixel data. More...

#include <image.h>

Collaboration diagram for eq::Image:

Public Member Functions
EQ_API	Image ()
	Construct a new Image. More...

virtual EQ_API	~Image ()
	Destruct the Image. More...

Image parameters
EQ_API void	setInternalFormat (const Frame::Buffer buffer, const uint32_t internalFormat)
	Set the internal format for the given buffer. More...

EQ_API uint32_t	getInternalFormat (const Frame::Buffer buffer) const

EQ_API uint32_t	getExternalFormat (const Frame::Buffer buffer) const
	Get the external format of the given buffer. More...

EQ_API uint32_t	getPixelSize (const Frame::Buffer buffer) const
	Get the size, in bytes, of one pixel in the external pixel data. More...

EQ_API bool	hasAlpha () const

EQ_API void	setStorageType (const Frame::Type type)
	Set the frame pixel storage type. More...

EQ_API Frame::Type	getStorageType () const

EQ_API void	setPixelViewport (const PixelViewport &pvp)
	Set the internal pixel viewport of the image. More...

EQ_API const PixelViewport &	getPixelViewport () const

EQ_API void	setZoom (const Zoom &zoom)
	Sets the zoom factor to be used for compositing. More...

EQ_API const Zoom &	getZoom () const

EQ_API void	setContext (const RenderContext &context)
	Set the render context producing this image. More...

EQ_API const RenderContext &	getContext () const

EQ_API void	useCompressor (Frame::Buffer buffer, uint32_t name)
	Set a compressor to be used during transmission of the image. More...

EQ_API void	reset ()
	Reset the image to its default state. More...

EQ_API void	flush ()
	Free all cached data of this image. More...

EQ_API void	deleteGLObjects (util::ObjectManager &om)
	Delete all OpenGL objects allocated from the given object manager. More...

EQ_API void	resetPlugins ()
	Deallocate all transfer and compression plugins. More...

Pixel Data Access
EQ_API const uint8_t *	getPixelPointer (const Frame::Buffer buffer) const

EQ_API uint8_t *	getPixelPointer (const Frame::Buffer buffer)

EQ_API uint32_t	getPixelDataSize (const Frame::Buffer buffer) const

EQ_API const PixelData &	getPixelData (const Frame::Buffer) const

EQ_API const PixelData &	compressPixelData (const Frame::Buffer)

EQ_API bool	hasPixelData (const Frame::Buffer buffer) const

EQ_API bool	hasAsyncReadback (const Frame::Buffer buffer) const

EQ_API bool	hasAsyncReadback () const

EQ_API void	clearPixelData (const Frame::Buffer buffer)
	Clear and validate an image buffer. More...

EQ_API void	validatePixelData (const Frame::Buffer buffer)
	Allocate an image buffer without initialization. More...

EQ_API void	setPixelData (const Frame::Buffer buffer, const PixelData &data)
	Set the pixel data of the given image buffer. More...

EQ_API void	setAlphaUsage (const bool enabled)
	Set alpha data preservation during download and compression. More...

EQ_API bool	getAlphaUsage () const

EQ_API void	setQuality (const Frame::Buffer buffer, const float quality)
	Set the minimum quality after a full download-compression path. More...

EQ_API float	getQuality (const Frame::Buffer buffer) const

Texture Data Access
EQ_API const util::Texture &	getTexture (const Frame::Buffer buffer) const
	Get the texture of this image. More...

EQ_API bool	hasTextureData (const Frame::Buffer buffer) const

Operations
EQ_API bool	startReadback (const uint32_t buffers, const PixelViewport &pvp, const RenderContext &context, const Zoom &zoom, util::ObjectManager &glObjects)
	Start reading back an image from the frame buffer. More...

bool	startReadback (const Frame::Buffer buffer, const util::Texture texture, const GLEWContext glewContext)

EQ_API void	finishReadback (const GLEWContext *glewContext)
	Finish an asynchronous readback. More...

EQ_API bool	upload (const Frame::Buffer buffer, util::Texture *texture, const Vector2i &position, util::ObjectManager &glObjects) const
	Upload this image to the frame buffer or a texture. More...

EQ_API bool	writeImage (const std::string &filename, const Frame::Buffer buffer) const
	Write the pixel data as rgb image file. More...

EQ_API bool	writeImages (const std::string &filenameTemplate) const
	Write all valid pixel data as separate images. More...

EQ_API bool	readImage (const std::string &filename, const Frame::Buffer buffer)
	Read pixel data from an uncompressed rgb image file. More...

void	setOffset (int32_t x, int32_t y)

Internal
EQ_API std::vector< uint32_t >	findCompressors (const Frame::Buffer buffer) const

EQ_API std::vector< uint32_t >	findTransferers (const Frame::Buffer buffer, const GLEWContext *gl) const

EQ_API bool	allocCompressor (const Frame::Buffer buffer, const uint32_t name)

EQ_API bool	allocDownloader (const Frame::Buffer buffer, const uint32_t name, const GLEWContext *glewContext)

EQ_API uint32_t	getDownloaderName (const Frame::Buffer buffer) const

Detailed Description

A holder for pixel data.

An image holds color and depth information for one rectangular region.

Definition at line 36 of file image.h.

Constructor & Destructor Documentation

EQ_API eq::Image::Image ( )

Construct a new Image.

Version: 1.0

virtual EQ_API eq::Image::~Image ( )

virtual

Destruct the Image.

Version: 1.0

Member Function Documentation

EQ_API void eq::Image::clearPixelData ( const Frame::Buffer buffer )

Clear and validate an image buffer.

RGBA and BGRA buffers are initialized with (0,0,0,255). DEPTH_UNSIGNED_INT buffers are initialized with 255. All other buffers are zero-initialized. Validates the buffer.

Parameters

buffer the image buffer to clear.

Version: 1.0

EQ_API const PixelData& eq::Image::compressPixelData ( const Frame::Buffer )

Returns: the pixel data, compressing it if needed.

Version: 1.0

EQ_API void eq::Image::deleteGLObjects ( util::ObjectManager & om )

Delete all OpenGL objects allocated from the given object manager.

Requires the appropriate OpenGL context to be current.

Version: 1.3.2

EQ_API void eq::Image::finishReadback ( const GLEWContext * glewContext )

Finish an asynchronous readback.

Parameters

glewContext the OpenGL function table.

Version: 1.7.1

EQ_API void eq::Image::flush ( )

Free all cached data of this image.

Version: 1.0

EQ_API bool eq::Image::getAlphaUsage ( ) const

Returns: true if alpha data can not be ignored.

Version: 1.0

EQ_API const RenderContext& eq::Image::getContext ( ) const

Returns: the rendering context which created this image, or a default.

EQ_API uint32_t eq::Image::getExternalFormat ( const Frame::Buffer buffer ) const

Get the external format of the given buffer.

The external format describes the layout of the pixel data in main memory. It is determined by the plugin used during download. The external format also determines the pixel size and alpha availability.

Parameters

buffer the frame buffer attachment.

Returns: the external format of the pixel data.

Version: 1.0

EQ_API uint32_t eq::Image::getInternalFormat ( const Frame::Buffer buffer ) const

Returns: the internal format of the pixel data.

Version: 1.0

EQ_API const PixelData& eq::Image::getPixelData ( const Frame::Buffer ) const

Returns: the pixel data.

Version: 1.0

EQ_API uint32_t eq::Image::getPixelDataSize ( const Frame::Buffer buffer ) const

Returns: the total size of the pixel data in bytes.

Version: 1.0

EQ_API const uint8_t* eq::Image::getPixelPointer ( const Frame::Buffer buffer ) const

Returns: a pointer to the raw pixel data.

Version: 1.0

EQ_API uint8_t* eq::Image::getPixelPointer ( const Frame::Buffer buffer )

Returns: a pointer to the raw pixel data.

Version: 1.0

EQ_API uint32_t eq::Image::getPixelSize ( const Frame::Buffer buffer ) const

Get the size, in bytes, of one pixel in the external pixel data.

Parameters

buffer the frame buffer attachment.

See also: getExternalFormat()

Version: 1.0

EQ_API const PixelViewport& eq::Image::getPixelViewport ( ) const

Returns: the internal pixel viewport.

Version: 1.0

EQ_API float eq::Image::getQuality ( const Frame::Buffer buffer ) const

Returns: the minimum quality.

Version: 1.0

EQ_API Frame::Type eq::Image::getStorageType ( ) const

Returns: the pixel data storage type.

Version: 1.0

EQ_API const util::Texture& eq::Image::getTexture ( const Frame::Buffer buffer ) const

Get the texture of this image.

Version: 1.0

EQ_API const Zoom& eq::Image::getZoom ( ) const

Returns: zoom factor to be used for compositing.

EQ_API bool eq::Image::hasAlpha ( ) const

Returns: true if the image has a color buffer with alpha values.

See also: getExternalFormat()

Version: 1.0

EQ_API bool eq::Image::hasAsyncReadback ( const Frame::Buffer buffer ) const

Returns: true if an async readback for a buffer is in progress.

Version: 1.3.2

EQ_API bool eq::Image::hasAsyncReadback ( ) const

Returns: true if an async readback for any buffer is in progress.

Version: 1.3.2

EQ_API bool eq::Image::hasPixelData ( const Frame::Buffer buffer ) const

Returns: true if the image has valid pixel data for the buffer.

Version: 1.0

EQ_API bool eq::Image::hasTextureData ( const Frame::Buffer buffer ) const

Returns: true if the image has texture data for the buffer.

Version: 1.0

EQ_API bool eq::Image::readImage	(	const std::string &	filename,
		const Frame::Buffer	buffer
	)

Read pixel data from an uncompressed rgb image file.

Version: 1.0

EQ_API void eq::Image::reset ( )

Reset the image to its default state.

This method does not free allocated memory or plugins. Invalidates all pixel data.

See also: flush()

Version: 1.0

EQ_API void eq::Image::resetPlugins ( )

Deallocate all transfer and compression plugins.

Requires the OpenGL context used during readback to be current.

Version: 1.3.2

EQ_API void eq::Image::setAlphaUsage ( const bool enabled )

Set alpha data preservation during download and compression.

Version: 1.0

EQ_API void eq::Image::setContext ( const RenderContext & context )

Set the render context producing this image.

EQ_API void eq::Image::setInternalFormat	(	const Frame::Buffer	buffer,
		const uint32_t	internalFormat
	)

Set the internal format for the given buffer.

The internal format descibes the format of the pixel data source, typically an OpenGL frame buffer or texture. The internal formats used by Equalizer use the same numerical value as their OpenGL counterpart.

Parameters

buffer	the frame buffer attachment.
internalFormat	the internal format.

Version: 1.0

EQ_API void eq::Image::setPixelData	(	const Frame::Buffer	buffer,
		const PixelData &	data
	)

Set the pixel data of the given image buffer.

Previous data for the buffer is overwritten. Validates the buffer. Depending on the given PixelData parameters, the pixel data is copied, decompressed or cleared.

Parameters

buffer	the image buffer to set.
data	the pixel data.

Version: 1.0

EQ_API void eq::Image::setPixelViewport ( const PixelViewport & pvp )

Set the internal pixel viewport of the image.

The image pixel data and textures will be invalidated. The pixel data describes the size of the image on the destination (GPU). Each downloaded buffer has its own size, which is potentially different from the image PVP.

Parameters

pvp	the pixel viewport.

Version: 1.0

EQ_API void eq::Image::setQuality	(	const Frame::Buffer	buffer,
		const float	quality
	)

Set the minimum quality after a full download-compression path.

The automatic selection of a download and compression plugin will never always choose plugins which maintain at least the given quality. A quality of 1.0 enables a lossless transmission path, and a quality of 0.0 disables all quality quarantees.

Parameters

buffer	the frame buffer attachment.
quality	the minimum quality to maintain.

Version: 1.0

EQ_API void eq::Image::setStorageType ( const Frame::Type type )

Set the frame pixel storage type.

Images of storage type TYPE_MEMORY are read back from the frame buffer into main memory using a transfer plugin. The data can be accessed through the PixelData.

Image of storage type TYPE_TEXTURE read frame buffer data into a texture, which can be accessed using getTexture().

Version: 1.0

EQ_API void eq::Image::setZoom ( const Zoom & zoom )

Sets the zoom factor to be used for compositing.

EQ_API bool eq::Image::startReadback	(	const uint32_t	buffers,
		const PixelViewport &	pvp,
		const RenderContext &	context,
		const Zoom &	zoom,
		util::ObjectManager &	glObjects
	)

Start reading back an image from the frame buffer.

Parameters

buffers	bit-wise combination of the Frame::Buffer components.
pvp	the area of the frame buffer wrt the drawable.
context	the render context producing the pixel data.
zoom	the scale factor to apply during readback.
glObjects	the GL object manager for the current GL context.

Returns: true when the operation requires a finishReadback().

Version: 1.3.2

EQ_API bool eq::Image::upload	(	const Frame::Buffer	buffer,
		util::Texture *	texture,
		const Vector2i &	position,
		util::ObjectManager &	glObjects
	)		const

Upload this image to the frame buffer or a texture.

If a texture is given, the upload is performed to it. Otherwise the pixel data is uploaded to the frame buffer. The texture will be initialized using the parameters corresponding to the requested buffer.

Parameters

buffer	the buffer type.
texture	the target texture, or 0 for frame buffer upload.
position	the destination offset wrt current GL viewport.
glObjects	the OpenGL object manager for the current context.

Returns: true on success, false on error.

Version: 1.0

EQ_API void eq::Image::useCompressor	(	Frame::Buffer	buffer,
		uint32_t	name
	)

Set a compressor to be used during transmission of the image.

The default compressor is EQ_COMPRESSOR_AUTO which selects the most suitable compressor based on the current image and buffer parameters.

Parameters

buffer	the frame buffer attachment.
name	the compressor name

EQ_API void eq::Image::validatePixelData ( const Frame::Buffer buffer )

Allocate an image buffer without initialization.

Version: 1.0

EQ_API bool eq::Image::writeImage	(	const std::string &	filename,
		const Frame::Buffer	buffer
	)		const

Write the pixel data as rgb image file.

Since version 1.9 (if build with OpenSceneGraph) this function can write images according to supported plugins, see http://trac.openscenegraph.org/projects/osg/wiki/Support/UserGuides/Plugins

Version: 1.0

EQ_API bool eq::Image::writeImages ( const std::string & filenameTemplate ) const

Write all valid pixel data as separate images.

Version: 1.0

The documentation for this class was generated from the following file:

image.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation