# QGLPixelBuffer Class Reference
## [[QtOpenGL](index.htm) module]
该QGLPixelBuffer类封装了一个OpenGL pbuffer的。[More...](#details)
继承[QPaintDevice](qpaintdevice.html)。
### Methods
* `__init__ (self, QSize size, QGLFormat format = QGLFormat.defaultFormat(), QGLWidget shareWidget = None)`
* `__init__ (self, int width, int height, QGLFormat format = QGLFormat.defaultFormat(), QGLWidget shareWidget = None)`
* `int bindTexture (self, QImage image, int target = GL_TEXTURE_2D)`
* `int bindTexture (self, QPixmap pixmap, int target = GL_TEXTURE_2D)`
* `int bindTexture (self, QString fileName)`
* `bool bindToDynamicTexture (self, int texture)`
* `deleteTexture (self, int texture_id)`
* `int devType (self)`
* `bool doneCurrent (self)`
* `drawTexture (self, QRectF target, int textureId, int textureTarget = GL_TEXTURE_2D)`
* `drawTexture (self, QPointF point, int textureId, int textureTarget = GL_TEXTURE_2D)`
* `QGLFormat format (self)`
* `int generateDynamicTexture (self)`
* `int handle (self)`
* `bool isValid (self)`
* `bool makeCurrent (self)`
* `int metric (self, QPaintDevice.PaintDeviceMetric metric)`
* `QPaintEngine paintEngine (self)`
* `releaseFromDynamicTexture (self)`
* `QSize size (self)`
* `QImage toImage (self)`
* `updateDynamicTexture (self, int texture_id)`
### Static Methods
* `bool hasOpenGLPbuffers ()`
* * *
## Detailed Description
该QGLPixelBuffer类封装了一个OpenGL pbuffer的。
渲染到pbuffer的通常情况下用完整的硬件加速。这可以比渲染成显着更快[QPixmap](qpixmap.html)。
有三种方法来使用这个类：
1. **We can draw into the pbuffer and convert it to a [QImage](qimage.html) using [toImage](qglpixelbuffer.html#toImage)().**这通常比调用更快[QGLWidget.renderPixmap](qglwidget.html#renderPixmap)（ ） 。
2. **We can draw into the pbuffer and copy the contents into an OpenGL texture using [updateDynamicTexture](qglpixelbuffer.html#updateDynamicTexture)().**这使我们能够创建与pbuffer的支持所有的系统动态纹理和作品。
3. **On systems that support it, we can bind the pbuffer to an OpenGL texture.**纹理将自动更新时， pbuffer的内容发生变化，不再需要额外的复制操作。这仅支持在Windows和Mac OS X系统，提供了`render_texture`扩展名。需要注意的是在Windows下，一个多采样pbuffer的不能与结合使用`render_texture`扩展名。如果一个多重采样pbuffer的在Windows下所要求的`render_texture`扩展关闭该pbuffer的。
### Threading
由于Qt的4.8的，有可能使用的是渲染成QGLPixelBuffer[QPainter](qpainter.html)在一个单独的线程。需要注意的是OpenGL的2.0或OpenGL ES 2.0的是需要这种合作。此外， X11下，有必要设置[Qt.AA_X11InitThreads](qt.html#ApplicationAttribute-enum)应用属性。
pbuffers的是通过对OpenGL提供`pbuffer`扩展;调用hasOpenGLPbuffer （ ） ，以找出是否为系统提供pbuffers的。
* * *
## Method Documentation
```
QGLPixelBuffer.__init__ (self, QSize size, QGLFormat format = QGLFormat.defaultFormat(), QGLWidget shareWidget = None)
```
构造给定一个OpenGL pbuffer的_size_。如果没有_format_被指定，则[default format](qglformat.html#defaultFormat)被使用。如果_shareWidget_参数指向一个有效的[QGLWidget](qglwidget.html)，该pbuffer的将共享其上下文_shareWidget_。
如果您打算在这个pbuffer的绑定为一个动态纹理的宽度和高度组件`size`必须是两个（例如， 512× 128）的权力。
**See also** [size](qglpixelbuffer.html#size)（）和[format](qglpixelbuffer.html#format)（ ） 。
```
QGLPixelBuffer.__init__ (self, int width, int height, QGLFormat format = QGLFormat.defaultFormat(), QGLWidget shareWidget = None)
```
这是一个重载函数。
构造一个OpenGL pbuffer的同_width_和_height_。如果没有_format_被指定，则[default format](qglformat.html#defaultFormat)被使用。如果_shareWidget_参数指向一个有效的[QGLWidget](qglwidget.html)，该pbuffer的将共享其上下文_shareWidget_。
如果您打算在这个pbuffer的绑定为一个动态纹理的宽度和高度组件`size`必须是两个（例如， 512× 128）的权力。
**See also** [size](qglpixelbuffer.html#size)（）和[format](qglpixelbuffer.html#format)（ ） 。
```
int QGLPixelBuffer.bindTexture (self, QImage image, int target = GL_TEXTURE_2D)
```
生成和二维GL纹理绑定到当前上下文的基础上，_image_。所生成的纹理ID被返回，并且可以被用于在以后glBindTexture （）调用。
该_target_参数指定纹理目标。
相当于调用[QGLContext.bindTexture](qglcontext.html#bindTexture)（ ） 。
**See also** [deleteTexture](qglpixelbuffer.html#deleteTexture)（ ） 。
```
int QGLPixelBuffer.bindTexture (self, QPixmap pixmap, int target = GL_TEXTURE_2D)
```
这是一个重载函数。
生成并根据绑定一个2D GL纹理_pixmap_。
相当于调用[QGLContext.bindTexture](qglcontext.html#bindTexture)（ ） 。
**See also** [deleteTexture](qglpixelbuffer.html#deleteTexture)（ ） 。
```
int QGLPixelBuffer.bindTexture (self, QString fileName)
```
这是一个重载函数。
读取DirectDrawSurface （ DDS ）压缩文件_fileName_并从它生成一个二维GL纹理。
相当于调用[QGLContext.bindTexture](qglcontext.html#bindTexture)（ ） 。
**See also** [deleteTexture](qglpixelbuffer.html#deleteTexture)（ ） 。
```
bool QGLPixelBuffer.bindToDynamicTexture (self, int texture)
```
通过绑定指定的质感_texture_id_该pbuffer的。成功时返回TRUE ，否则返回False 。
纹理必须是相同的尺寸和格式的pbuffer的的。
要解除绑定纹理，呼叫[releaseFromDynamicTexture](qglpixelbuffer.html#releaseFromDynamicTexture)（ ） 。虽然质地是绑定的，它会自动更新时， pbuffer的内容发生变化，不再需要额外的复制操作。
例如：
```
[QGLPixelBuffer](qglpixelbuffer.html) pbuffer(...);
...
pbuffer.makeCurrent();
GLuint dynamicTexture = pbuffer.generateDynamicTexture();
pbuffer.bindToDynamicTexture(dynamicTexture);
...
pbuffer.releaseFromDynamicTexture();
```
**Warning:**该函数使用`render_texture`扩展，这是目前没有在X11下的支持。在所有的系统（包括X11）的作品另一种方法是手动使用pbuffer的内容复制到一个纹理[updateDynamicTexture](qglpixelbuffer.html#updateDynamicTexture)（ ） 。
**Warning:**对于bindToDynamicTexture （ ）调用成功，在Mac OS X上， pbuffer的需要一个共享的情况下，即[QGLPixelBuffer](qglpixelbuffer.html)必须以份额小部件来创建。
**See also** [generateDynamicTexture](qglpixelbuffer.html#generateDynamicTexture)（）和[releaseFromDynamicTexture](qglpixelbuffer.html#releaseFromDynamicTexture)（ ） 。
```
QGLPixelBuffer.deleteTexture (self, int texture_id)
```
去除所确定的纹理_texture_id_从纹理高速缓存。
相当于调用[QGLContext.deleteTexture](qglcontext.html#deleteTexture)（ ） 。
```
int QGLPixelBuffer.devType (self)
```
```
bool QGLPixelBuffer.doneCurrent (self)
```
是没有上下文的当前OpenGL上下文。成功时返回TRUE ，否则返回False 。
```
QGLPixelBuffer.drawTexture (self, QRectF target, int textureId, int textureTarget = GL_TEXTURE_2D)
```
绘制给定的质感，_textureId_向给定目标矩形，_target_在OpenGL的模型空间。该_textureTarget_应该是一个2D纹理的目标。
等同于相应的[QGLContext.drawTexture](qglcontext.html#drawTexture)（ ） 。
此功能被引入Qt的4.4 。
```
QGLPixelBuffer.drawTexture (self, QPointF point, int textureId, int textureTarget = GL_TEXTURE_2D)
```
绘制给定的质感，_textureId_，在给定的_point_在OpenGL的模型空间。该textureTarget参数应该是一个2D纹理的目标。
等同于相应的[QGLContext.drawTexture](qglcontext.html#drawTexture)（ ） 。
此功能被引入Qt的4.4 。
```
QGLFormat QGLPixelBuffer.format (self)
```
[
返回pbuffer的格式。该格式可以是从被请求的不同。
```
int QGLPixelBuffer.generateDynamicTexture (self)
```
](qglformat.html)
[生成并结合一个2D GL的手感是大小相同的pbuffer的，并返回该纹理的ID。这可与结合使用](qglformat.html)[bindToDynamicTexture](qglpixelbuffer.html#bindToDynamicTexture)（）和[updateDynamicTexture](qglpixelbuffer.html#updateDynamicTexture)（ ） 。
**See also** [size](qglpixelbuffer.html#size)（ ） 。
```
int QGLPixelBuffer.handle (self)
```
返回本机pbuffer的句柄。
```
bool QGLPixelBuffer.hasOpenGLPbuffers ()
```
返回True如果OpenGL的`pbuffer`扩展出现在这个系统上，否则返回False 。
```
bool QGLPixelBuffer.isValid (self)
```
返回True如果pbuffer的是有效的，否则返回False 。
```
bool QGLPixelBuffer.makeCurrent (self)
```
使得这个pbuffer的当前OpenGL渲染上下文。成功时返回TRUE ，否则返回False 。
**See also** [QGLContext.makeCurrent](qglcontext.html#makeCurrent)（）和[doneCurrent](qglpixelbuffer.html#doneCurrent)（ ） 。
```
int QGLPixelBuffer.metric (self, QPaintDevice.PaintDeviceMetric metric)
```
从重新实现[QPaintDevice.metric](qpaintdevice.html#metric)（ ） 。
```
QPaintEngine QGLPixelBuffer.paintEngine (self)
```
[](qpaintengine.html)
[从重新实现](qpaintengine.html)[QPaintDevice.paintEngine](qpaintdevice.html#paintEngine)（ ） 。
```
QGLPixelBuffer.releaseFromDynamicTexture (self)
```
发布任何以前绑定的质感pbuffer的。
**See also** [bindToDynamicTexture](qglpixelbuffer.html#bindToDynamicTexture)（ ） 。
```
QSize QGLPixelBuffer.size (self)
```
[
返回pbuffer的大小。
](qsize.html)
```
QImage QGLPixelBuffer.toImage (self)
```
[](qimage.html)
[返回pbuffer的内容作为](qimage.html)[QImage](qimage.html)。
```
QGLPixelBuffer.updateDynamicTexture (self, int texture_id)
```
与指定复制pbuffer的内容到纹理_texture_id_。
纹理必须是相同的尺寸和格式的pbuffer的的。
例如：
```
[QGLPixelBuffer](qglpixelbuffer.html) pbuffer(...);
...
pbuffer.makeCurrent();
GLuint dynamicTexture = pbuffer.generateDynamicTexture();
...
pbuffer.updateDynamicTexture(dynamicTexture);
```
在支持Windows和Mac OS X系统的替代`render_texture`分机是用[bindToDynamicTexture](qglpixelbuffer.html#bindToDynamicTexture)（）来获取纹理的动态更新。
**See also** [generateDynamicTexture](qglpixelbuffer.html#generateDynamicTexture)（）和[bindToDynamicTexture](qglpixelbuffer.html#bindToDynamicTexture)（ ） 。
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- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference