232 lines
10 KiB
Python
232 lines
10 KiB
Python
from pyqtgraph.Qt import QtGui, QtCore, USE_PYSIDE
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import pyqtgraph.multiprocess as mp
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import pyqtgraph as pg
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from .GraphicsView import GraphicsView
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import numpy as np
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import mmap, tempfile, ctypes, atexit, sys, random
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__all__ = ['RemoteGraphicsView']
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class RemoteGraphicsView(QtGui.QWidget):
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"""
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Replacement for GraphicsView that does all scene management and rendering on a remote process,
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while displaying on the local widget.
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GraphicsItems must be created by proxy to the remote process.
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"""
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def __init__(self, parent=None, *args, **kwds):
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self._img = None
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self._imgReq = None
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self._sizeHint = (640,480) ## no clue why this is needed, but it seems to be the default sizeHint for GraphicsView.
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## without it, the widget will not compete for space against another GraphicsView.
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QtGui.QWidget.__init__(self)
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self._proc = mp.QtProcess(debug=False)
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self.pg = self._proc._import('pyqtgraph')
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self.pg.setConfigOptions(**self.pg.CONFIG_OPTIONS)
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rpgRemote = self._proc._import('pyqtgraph.widgets.RemoteGraphicsView')
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self._view = rpgRemote.Renderer(*args, **kwds)
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self._view._setProxyOptions(deferGetattr=True)
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self.setFocusPolicy(QtCore.Qt.StrongFocus)
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self.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
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self.setMouseTracking(True)
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self.shm = None
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shmFileName = self._view.shmFileName()
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if sys.platform.startswith('win'):
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self.shmtag = shmFileName
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else:
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self.shmFile = open(shmFileName, 'r')
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self._view.sceneRendered.connect(mp.proxy(self.remoteSceneChanged)) #, callSync='off'))
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## Note: we need synchronous signals
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## even though there is no return value--
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## this informs the renderer that it is
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## safe to begin rendering again.
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for method in ['scene', 'setCentralItem']:
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setattr(self, method, getattr(self._view, method))
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def resizeEvent(self, ev):
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ret = QtGui.QWidget.resizeEvent(self, ev)
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self._view.resize(self.size(), _callSync='off')
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return ret
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def sizeHint(self):
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return QtCore.QSize(*self._sizeHint)
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def remoteSceneChanged(self, data):
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w, h, size, newfile = data
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#self._sizeHint = (whint, hhint)
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if self.shm is None or self.shm.size != size:
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if self.shm is not None:
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self.shm.close()
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if sys.platform.startswith('win'):
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self.shmtag = newfile ## on windows, we create a new tag for every resize
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self.shm = mmap.mmap(-1, size, self.shmtag) ## can't use tmpfile on windows because the file can only be opened once.
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else:
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self.shm = mmap.mmap(self.shmFile.fileno(), size, mmap.MAP_SHARED, mmap.PROT_READ)
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self.shm.seek(0)
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self._img = QtGui.QImage(self.shm.read(w*h*4), w, h, QtGui.QImage.Format_ARGB32)
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self.update()
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def paintEvent(self, ev):
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if self._img is None:
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return
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p = QtGui.QPainter(self)
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p.drawImage(self.rect(), self._img, QtCore.QRect(0, 0, self._img.width(), self._img.height()))
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p.end()
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def mousePressEvent(self, ev):
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self._view.mousePressEvent(ev.type(), ev.pos(), ev.globalPos(), ev.button(), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
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ev.accept()
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return QtGui.QWidget.mousePressEvent(self, ev)
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def mouseReleaseEvent(self, ev):
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self._view.mouseReleaseEvent(ev.type(), ev.pos(), ev.globalPos(), ev.button(), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
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ev.accept()
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return QtGui.QWidget.mouseReleaseEvent(self, ev)
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def mouseMoveEvent(self, ev):
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self._view.mouseMoveEvent(ev.type(), ev.pos(), ev.globalPos(), ev.button(), int(ev.buttons()), int(ev.modifiers()), _callSync='off')
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ev.accept()
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return QtGui.QWidget.mouseMoveEvent(self, ev)
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def wheelEvent(self, ev):
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self._view.wheelEvent(ev.pos(), ev.globalPos(), ev.delta(), int(ev.buttons()), int(ev.modifiers()), ev.orientation(), _callSync='off')
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ev.accept()
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return QtGui.QWidget.wheelEvent(self, ev)
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def keyEvent(self, ev):
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if self._view.keyEvent(ev.type(), int(ev.modifiers()), text, autorep, count):
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ev.accept()
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return QtGui.QWidget.keyEvent(self, ev)
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def enterEvent(self, ev):
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self._view.enterEvent(ev.type(), _callSync='off')
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return QtGui.QWidget.enterEvent(self, ev)
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def leaveEvent(self, ev):
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self._view.leaveEvent(ev.type(), _callSync='off')
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return QtGui.QWidget.leaveEvent(self, ev)
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def remoteProcess(self):
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"""Return the remote process handle. (see multiprocess.remoteproxy.RemoteEventHandler)"""
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return self._proc
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class Renderer(GraphicsView):
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## Created by the remote process to handle render requests
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sceneRendered = QtCore.Signal(object)
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def __init__(self, *args, **kwds):
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## Create shared memory for rendered image
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if sys.platform.startswith('win'):
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self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
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self.shm = mmap.mmap(-1, mmap.PAGESIZE, self.shmtag) # use anonymous mmap on windows
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else:
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self.shmFile = tempfile.NamedTemporaryFile(prefix='pyqtgraph_shmem_')
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self.shmFile.write('\x00' * mmap.PAGESIZE)
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fd = self.shmFile.fileno()
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self.shm = mmap.mmap(fd, mmap.PAGESIZE, mmap.MAP_SHARED, mmap.PROT_WRITE)
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atexit.register(self.close)
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GraphicsView.__init__(self, *args, **kwds)
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self.scene().changed.connect(self.update)
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self.img = None
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self.renderTimer = QtCore.QTimer()
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self.renderTimer.timeout.connect(self.renderView)
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self.renderTimer.start(16)
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def close(self):
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self.shm.close()
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if sys.platform.startswith('win'):
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self.shmFile.close()
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def shmFileName(self):
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if sys.platform.startswith('win'):
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return self.shmtag
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else:
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return self.shmFile.name
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def update(self):
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self.img = None
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return GraphicsView.update(self)
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def resize(self, size):
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oldSize = self.size()
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GraphicsView.resize(self, size)
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self.resizeEvent(QtGui.QResizeEvent(size, oldSize))
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self.update()
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def renderView(self):
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if self.img is None:
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## make sure shm is large enough and get its address
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if self.width() == 0 or self.height() == 0:
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return
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size = self.width() * self.height() * 4
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if size > self.shm.size():
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if sys.platform.startswith('win'):
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## windows says "WindowsError: [Error 87] the parameter is incorrect" if we try to resize the mmap
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self.shm.close()
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## it also says (sometimes) 'access is denied' if we try to reuse the tag.
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self.shmtag = "pyqtgraph_shmem_" + ''.join([chr((random.getrandbits(20)%25) + 97) for i in range(20)])
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self.shm = mmap.mmap(-1, size, self.shmtag)
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else:
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self.shm.resize(size)
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address = ctypes.addressof(ctypes.c_char.from_buffer(self.shm, 0))
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## render the scene directly to shared memory
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if USE_PYSIDE:
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ch = ctypes.c_char.from_buffer(self.shm, 0)
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#ch = ctypes.c_char_p(address)
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self.img = QtGui.QImage(ch, self.width(), self.height(), QtGui.QImage.Format_ARGB32)
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else:
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self.img = QtGui.QImage(address, self.width(), self.height(), QtGui.QImage.Format_ARGB32)
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self.img.fill(0xffffffff)
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p = QtGui.QPainter(self.img)
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self.render(p, self.viewRect(), self.rect())
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p.end()
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self.sceneRendered.emit((self.width(), self.height(), self.shm.size(), self.shmFileName()))
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def mousePressEvent(self, typ, pos, gpos, btn, btns, mods):
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typ = QtCore.QEvent.Type(typ)
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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return GraphicsView.mousePressEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
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def mouseMoveEvent(self, typ, pos, gpos, btn, btns, mods):
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typ = QtCore.QEvent.Type(typ)
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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return GraphicsView.mouseMoveEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
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def mouseReleaseEvent(self, typ, pos, gpos, btn, btns, mods):
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typ = QtCore.QEvent.Type(typ)
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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return GraphicsView.mouseReleaseEvent(self, QtGui.QMouseEvent(typ, pos, gpos, btn, btns, mods))
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def wheelEvent(self, pos, gpos, d, btns, mods, ori):
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btns = QtCore.Qt.MouseButtons(btns)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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return GraphicsView.wheelEvent(self, QtGui.QWheelEvent(pos, gpos, d, btns, mods, ori))
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def keyEvent(self, typ, mods, text, autorep, count):
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typ = QtCore.QEvent.Type(typ)
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mods = QtCore.Qt.KeyboardModifiers(mods)
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GraphicsView.keyEvent(self, QtGui.QKeyEvent(typ, mods, text, autorep, count))
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return ev.accepted()
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def enterEvent(self, typ):
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ev = QtCore.QEvent(QtCore.QEvent.Type(typ))
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return GraphicsView.enterEvent(self, ev)
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def leaveEvent(self, typ):
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ev = QtCore.QEvent(QtCore.QEvent.Type(typ))
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return GraphicsView.leaveEvent(self, ev)
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