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authorGirish Ramakrishnan <girish.1.ramakrishnan@nokia.com>2012-06-25 18:27:22 -0700
committerQt by Nokia <qt-info@nokia.com>2012-07-03 08:11:54 +0200
commitf128c1f6d3cbdc1aa13f9ec65fd2354ef91c1c48 (patch)
treebb16289389a6805ea371e162543f96f9e3246104 /src/gui/kernel/qplatformsharedgraphicscache_qpa.cpp
parent28f30aa5437d8a53bc9124a1459243c475670601 (diff)
Remove _qpa from cpp filenames
36547f4eff44361f7a6acd0cff107c0e47561f93 removed the _qpa from .h files and promised to remove it from .cpp files at a later date. Change-Id: I24a5c3796f6b07dd9a1931b699f3212d315edb12 Reviewed-by: Andrew Stanley-Jones <andrew.stanley-jones@nokia.com>
Diffstat (limited to 'src/gui/kernel/qplatformsharedgraphicscache_qpa.cpp')
-rw-r--r--src/gui/kernel/qplatformsharedgraphicscache_qpa.cpp296
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diff --git a/src/gui/kernel/qplatformsharedgraphicscache_qpa.cpp b/src/gui/kernel/qplatformsharedgraphicscache_qpa.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/
-**
-** This file is part of the QtGui module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** GNU Lesser General Public License Usage
-** This file may be used under the terms of the GNU Lesser General Public
-** License version 2.1 as published by the Free Software Foundation and
-** appearing in the file LICENSE.LGPL included in the packaging of this
-** file. Please review the following information to ensure the GNU Lesser
-** General Public License version 2.1 requirements will be met:
-** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU General
-** Public License version 3.0 as published by the Free Software Foundation
-** and appearing in the file LICENSE.GPL included in the packaging of this
-** file. Please review the following information to ensure the GNU General
-** Public License version 3.0 requirements will be met:
-** http://www.gnu.org/copyleft/gpl.html.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qplatformsharedgraphicscache.h"
-
-QT_BEGIN_NAMESPACE
-
-/*!
- \class QPlatformSharedGraphicsCache
- \since 5.0
- \internal
- \preliminary
- \ingroup qpa
- \brief The QPlatformSharedGraphicsCache is an abstraction of a cross-process graphics cache.
-
- If supported, it is possible to retrieve a QPlatformSharedGraphicsCache object from the
- platform integration. This is typically used to store graphical items which should be shared
- between several processes.
-
- Items are requested from the cache by calling requestItems(). If the cache contains the
- requested items in the requested cache, the itemsAvailable() signal is emitted with the ID of
- the graphical buffer and each item's coordinates inside the buffer. Before requesting items
- from a cache, the user must call ensureCacheInitialized() to set the correct parameters for
- the cache.
-
- If the cache does not yet contain the requested items, it will emit a similar itemsMissing()
- signal. The client can then call updateItems() with rasterizations of the items and they will be
- entered into the shared cache. As the items are rendered into the cache, itemsAvailable() signals
- will be emitted for each of the items which have previously been requested and which have not
- yet been reported as ready.
-
- Using beginRequestBatch() and endRequestBatch(), it's possible to batch glyph requests, which
- could improve performance in cases where you have a sequence of requests pending, and you
- do not need the results during this sequence.
-*/
-
-/*!
- \enum BufferType
-
- Defines how the type of buffer required to contain a cache.
-
- \value OpenGLTexture The buffer will be allocated in graphics memory, and an OpenGL texture
- for a buffer belonging to the cache can be requested using
- textureIdForBuffer().
-*/
-
-/*!
- \enum PixelFormat
-
- Defines the pixel format of a cache.
-
- \value Alpha8 The cache will use 8 bits to represent the alpha value of each pixel. If an
- OpenGL texture is created for a buffer belong to the cache, it will have the
- pixel format GL_ALPHA.
-*/
-
-/*!
- \fn void ensureCacheInitialized(const QByteArray &cacheId, BufferType bufferType, PixelFormat pixelFormat)
-
- Initializes a cache named \a cacheId if it has not yet been initialized. The \a bufferType and
- \a pixelFormat gives the format of the buffers that will be used to contain the items in the
- cache. If a cache with the same \a cacheId has previously been initialized, the call will be
- ignored. The cache will keep its previously set buffer type and pixel format.
-*/
-
-/*!
- \fn void QPlatformSharedGraphicsCache::requestItems(const QByteArray &cacheId, const QVector<quint32> &itemIds)
-
- Requests all the items in \a itemIds from the cache with the name \a cacheId.
-
- If any or all of the items are available in the cache, one or more itemsAvailable() signals will be
- emitted corresponding to the items. If the cache does not contain all of the items in question,
- then an itemsMissing() signal will be emitted corresponding to the missing items. The user
- is at this point expected to call insertItems() to insert the missing items into the cache. If
- the inserted items have previously been requested by the user, at which point an itemsAvailable()
- signal will be emitted corresponding to the items.
-
- Before requesting items from a cache, the user must call ensureCacheInitialized() with the
- correct parameters for the cache.
-*/
-
-/*!
- \fn void QPlatformSharedGraphicsCache::insertItems(const QByteArray &cacheId, const QVector<quint32> &itemIds, const QVector<QImage> &items)
-
- Inserts the items in \a itemIds into the cache named \a cacheId. The appearance of
- each item is stored in \a items. The format of the QImage objects is expected to match the
- pixel format of the cache as it was initialized in ensureCacheInitialized().
-
- When the items have been successfully entered into the cache, one or more itemsAvailable() signals
- will be emitted for the items.
-
- If the cache already contains the items, the behavior is implementation-specific. The
- implementation may choose to ignore the items or it may overwrite the existing instances in
- the cache. Either way, itemsAvailable() signals corresponding to the inserted items will be
- emitted.
-*/
-
-/*!
- \fn void QPlatformSharedGraphicsCache::releaseItems(const QByteArray &cacheId, const QVector<quint32> &itemIds)
-
- Releases the reference to the items in \a itemIds from the cache named \a cacheId. This should
- only be called when all references to the items have been released by the user, and they are no
- longer needed.
-*/
-
-/*!
- \fn void itemsMissing(const QByteArray &cacheId, const QVector<quint32> *itemIds)
-
- This signal is emitted when requestItems() has been called for one or more items in the
- cache named \a cacheId which are not yet available in the cache. The user is then expected to
- call insertItems() to update the cache with the respective items, at which point they will
- become available to all clients of the shared cache.
-
- The vector \a itemIds contains the IDs of the items that need to be inserted into the cache.
-
- \sa itemsAvailable(), insertItems(), requestItems()
-*/
-
-/*!
- \fn void itemsAvailable(const QByteArray &cacheId, void *bufferId, const QSize &bufferSize, const QVector<quint32> &itemIds, const QVector<QPoint> &positionsInBuffer)
-
- This signal can be emitted at any time when either requestItems() or insertItems() has been
- called by the application for one or more items in the cache named \a cacheId, as long as
- releaseItems() has not subsequently been called for the same items. It instructs the application
- on where to find the items that have been entered into the cache. When the application receives
- a buffer, it is expected to reference it using referenceBuffer() on it if it keeps a reference
- to the buffer.
-
- The \a bufferId is an ID for the buffer that contains the items. The \a bufferId can be
- converted to a format usable by the application depending on which format it was given at
- initialization. If it is a OpenGLTexture, its texture ID can be requested using the
- textureIdForBuffer() function. The dimensions of the buffer are given by \a bufferSize.
-
- The items provided by the cache are identified in the \a itemIds vector. The
- \a positionsInBuffer vector contains the locations inside the buffer of each item. Each entry in
- \a positionsInBuffer corresponds to an item in \a itemIds.
-
- The buffer and the items' locations within the buffer can be considered valid until an
- itemsInvalidated() signal has been emitted for the items, or until releaseItems() is called
- for the items.
-
- \sa itemsMissing(), requestItems(), bufferType()
-*/
-
-/*!
- \fn void itemsUpdated(const QByteArray &cacheId, void *bufferId, const QSize &bufferSize, const QVector<quint32> &itemIds, const QVector<QPoint> &positionsInBuffer)
-
- This signal is similar in usage to the itemsAvailable() signal, but will be emitted when
- the location of a previously requested or inserted item has been updated. The application
- must update its data for the respective items and release any references to old buffers held
- by the items.
-
- If the application no longer holds any references to previously referenced items in a given
- cache, it should call releaseItems() for these items, at which point it will no longer receive
- any itemsUpdated() signal for these items.
-
- \sa requestItems(), insertItems(), itemsAvailable()
-*/
-
-/*!
- \fn void itemsInvalidated(const QByteArray &cacheId, const QVector<quint32> &itemIds)
-
- This signal is emitted when the items given by \a itemIds in the cache named \a cacheId have
- been removed from the cache and the previously reported information about them is considered
- invalid. It will only be emitted for items for which a buffer has previously been identified
- through the itemsAvailable() signal (either as response to a requestItems() call or an
- insertItems() call.)
-
- The application is expected to throw away information about the items in the \a itemIds array
- and drop any references it might have to the memory held by the buffer. If the items are still
- required by the application, it can re-commit them to the cache using the insertItems() function.
-
- If the application no longer holds any references to previously referenced items in a given
- cache, it should call releaseItems() for these items, at which point it will no longer receive
- any itemsInvalidated() signal for these items.
-*/
-
-/*!
- \fn void beginRequestBatch()
-
- This is a hint to the cache that a burst of requests is pending. In some implementations, this
- will improve performance, as the cache can focus on handling the requests and wait with the
- results until it is done. It should typically be called prior to a sequence of calls to
- requestItems() and releaseItems().
-
- Any call to beginRequestBatch() must be followed at some point by a call to endRequestBatch().
- Failing to do this may lead to the results of requests never being emitted.
-
- \note beginRequestBatch() and endRequestBatch() have no stacking logic. Calling
- beginRequestBatch() twice in a row has no effect, and the single existing batch will be ended
- by the earliest call to endRequestBatch().
-
- \sa endRequestBatch(), requestBatchStarted()
-*/
-
-/*!
- \fn void endRequestBatch()
-
- Signals to the cache that the request sequence which has previously been commenced using
- beginRequestBatch() has now finished.
-
- \sa beginRequestBatch(), requestBatchStarted()
-*/
-
-/*!
- \fn bool requestBatchStarted() const
-
- Returns true if a request batch has previously been started using beginRequestBatch()
- and not yet stopped using endRequestBatch().
-
- \sa beginRequestBatch(), endRequestBatch()
-*/
-
-/*!
- \fn uint textureIdForBuffer(void *bufferId)
-
- Returns an OpenGL texture ID corresponding to the buffer \a bufferId, which has previously
- been passed through signals itemsAvailable() or itemsUpdated(). The relevant OpenGL context
- should be current when calling this function.
-
- \sa eglImageForBuffer(), sizeOfBuffer()
-*/
-
-/*!
- \fn void *eglImageForBuffer(void *bufferId)
-
- Returns an EGLImageKHR image corresponding to the buffer \a bufferId.
-
- \sa textureIdForBuffer(), sizeOfBuffer()
-*/
-
-/*!
- \fn void referenceBuffer(void *bufferId)
-
- Registers a reference to the buffer \a bufferId.
-
- \sa dereferenceBuffer()
-*/
-
-/*!
- \fn bool dereferenceBuffer(void *bufferId)
-
- Removed a previously registered reference to the buffer \a bufferId. Returns true if there
- are still more references to the buffer in question, or false if this was the last reference
- (in which case the buffer may have been deleted in the cache.)
-
- \sa dereferenceBuffer()
-*/
-
-/*!
- \fn QSize sizeOfBuffer(void *bufferId)
-
- Returns the size of the buffer \a bufferId.
-
- \sa textureIdForBuffer(), eglImageForBuffer()
-*/
-
-QT_END_NAMESPACE