QBitmap 类提供单色 (1 位深度) 像素图。 更多...
继承 QPixmap .
QBitmap 类提供单色 (1 位深度) 像素图。
The QBitmap class is a monochrome off-screen paint device used mainly for creating custom QCursor and QBrush 对象，构造 QRegion objects, and for setting masks for pixmaps and widgets.
QBitmap 是 QPixmap subclass ensuring a depth of 1, except for null objects which have a depth of 0. If a pixmap with a depth greater than 1 is assigned to a bitmap, the bitmap will be dithered automatically.
使用 QColor 对象 Qt.color0 and Qt.color1 when drawing on a QBitmap object (or a QPixmap object with depth 1).
描绘采用 Qt.color0 将位图位设为 0，和描绘采用 Qt.color1 sets the bits to 1. For a bitmap, 0-bits indicate background (or transparent pixels) and 1-bits indicate foreground (or opaque pixels). Use the clear () 函数以将所有位设为 Qt.color0 . Note that using the Qt.black and Qt.white colors make no sense because the QColor.pixel () value is not necessarily 0 for black and 1 for white.
QBitmap 类提供 transformed () function returning a transformed copy of the bitmap; use the QTransform argument to translate, scale, shear, and rotate the bitmap. In addition, QBitmap provides the static fromData () function which returns a bitmap constructed from the given uchar 数据，而静态 fromImage () function returning a converted copy of a QImage 对象。
就像 QPixmap class, QBitmap is optimized by the use of implicit data sharing. For more information, see the Implicit Data Sharing 文档编制。
构造 null 位图。
另请参阅 QPixmap.isNull ().
构造位图拷贝为给定 pixmap .
If the pixmap has a depth greater than 1, the resulting bitmap will be dithered automatically.
另请参阅 QPixmap.depth (), fromImage ()，和 fromData ().
构造位图，采用给定 width and height 。内部的像素未被初始化。
另请参阅 clear ().
构造位图，采用给定 size . The pixels in the bitmap are uninitialized.
另请参阅 clear ().
构造位图从文件指定通过给定 fileName . If the file does not exist, or has an unknown format, the bitmap becomes a null bitmap.
fileName and format parameters are passed on 到 QPixmap.load () function. If the file format uses more than 1 bit per pixel, the resulting bitmap will be dithered automatically.
另请参阅 QPixmap.isNull () 和 QImageReader.imageFormat ().
清零位图，将其所有位设为 Qt.color0 .
构造位图，采用给定 size , and sets the contents to the bits 供给。
The bitmap data has to be byte aligned and provided in in the bit order specified by monoFormat . The mono format must be either QImage.Format_Mono or QImage.Format_MonoLSB 。使用 QImage.Format_Mono to specify data on the XBM format.
另请参阅 fromImage ().
返回拷贝为给定 image converted to a bitmap using the specified image conversion flags .
另请参阅 fromData ().
交换位图 other with this bitmap. This operation is very fast and never fails.
该函数在 Qt 4.8 引入。
Returns a copy of this bitmap, transformed according to the given matrix .
另请参阅 QPixmap.transformed ().
