Source code for pyqtgraph.widgets.RawImageWidget

"""
RawImageWidget.py
Copyright 2010-2016 Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more information.
"""

import numpy

from .. import functions as fn
from .. import functions_qimage
from .. import getConfigOption, getCupy
from ..Qt import QtCore, QtGui, QtWidgets

try:
    QOpenGLWidget = QtWidgets.QOpenGLWidget
    from OpenGL.GL import *  # noqa

    HAVE_OPENGL = True
except (ImportError, AttributeError):
    # Would prefer `except ImportError` here, but some versions of pyopengl generate
    # AttributeError upon import
    HAVE_OPENGL = False

__all__ = ['RawImageWidget']

[docs] class RawImageWidget(QtWidgets.QWidget): """ Widget optimized for very fast video display. Generally using an ImageItem inside GraphicsView is fast enough. On some systems this may provide faster video. See the VideoSpeedTest example for benchmarking. """
[docs] def __init__(self, parent=None, scaled=False): """ Setting scaled=True will cause the entire image to be displayed within the boundaries of the widget. This also greatly reduces the speed at which it will draw frames. """ QtWidgets.QWidget.__init__(self, parent) self.setSizePolicy(QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Expanding, QtWidgets.QSizePolicy.Policy.Expanding)) self.scaled = scaled self.opts = None self.image = None self._cp = getCupy()
[docs] def setImage(self, img, *args, **kargs): """ img must be ndarray of shape (x,y), (x,y,3), or (x,y,4). Extra arguments are sent to functions.makeARGB """ if getConfigOption('imageAxisOrder') == 'col-major': img = img.swapaxes(0, 1) self.opts = (img, args, kargs) self.image = None self.update()
def paintEvent(self, ev): if self.opts is None: return if self.image is None: img = self.opts[0] xp = self._cp.get_array_module(img) if self._cp else numpy qimage = None if ( not self.opts[1] # no positional arguments and {"levels", "lut"}.issuperset(self.opts[2]) # no kwargs besides levels and lut and not (img.dtype.kind == "f" and xp.isnan(img.min())) ): qimage = functions_qimage.try_make_qimage( img, levels=self.opts[2].get("levels"), lut=self.opts[2].get("lut"), ) if qimage is None: argb, alpha = fn.makeARGB(self.opts[0], *self.opts[1], **self.opts[2]) if self._cp and self._cp.get_array_module(argb) == self._cp: argb = argb.get() # transfer GPU data back to the CPU qimage = fn.ndarray_to_qimage(argb, QtGui.QImage.Format.Format_ARGB32) self.image = qimage self.opts = () # if self.pixmap is None: # self.pixmap = QtGui.QPixmap.fromImage(self.image) p = QtGui.QPainter(self) if self.scaled: rect = self.rect() ar = rect.width() / float(rect.height()) imar = self.image.width() / float(self.image.height()) if ar > imar: rect.setWidth(int(rect.width() * imar / ar)) else: rect.setHeight(int(rect.height() * ar / imar)) p.drawImage(rect, self.image) else: p.drawImage(QtCore.QPointF(), self.image) # p.drawPixmap(self.rect(), self.pixmap) p.end()
if HAVE_OPENGL: __all__.append('RawImageGLWidget') class RawImageGLWidget(QOpenGLWidget): """ Similar to RawImageWidget, but uses a GL widget to do all drawing. Performance varies between platforms; see examples/VideoSpeedTest for benchmarking. Checks if setConfigOptions(imageAxisOrder='row-major') was set. """ def __init__(self, parent=None, scaled=False): QOpenGLWidget.__init__(self, parent) self.scaled = scaled self.image = None self.uploaded = False self.smooth = False self.opts = None def setImage(self, img, *args, **kargs): """ img must be ndarray of shape (x,y), (x,y,3), or (x,y,4). Extra arguments are sent to functions.makeARGB """ if getConfigOption('imageAxisOrder') == 'col-major': img = img.swapaxes(0, 1) self.opts = (img, args, kargs) self.image = None self.uploaded = False self.update() def initializeGL(self): self.texture = glGenTextures(1) def uploadTexture(self): glEnable(GL_TEXTURE_2D) glBindTexture(GL_TEXTURE_2D, self.texture) if self.smooth: glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR) else: glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER) glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER) # glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER) ## Test texture dimensions first # shape = self.image.shape # glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA, shape[0], shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, None) # if glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH) == 0: # raise Exception("OpenGL failed to create 2D texture (%dx%d); too large for this hardware." % shape[:2]) h, w = self.image.shape[:2] glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, self.image) glDisable(GL_TEXTURE_2D) self.uploaded = True def paintGL(self): glClear(GL_COLOR_BUFFER_BIT) if self.image is None: if self.opts is None: return img, args, kwds = self.opts kwds['useRGBA'] = True self.image, _ = fn.makeARGB(img, *args, **kwds) if not self.uploaded: self.uploadTexture() glEnable(GL_TEXTURE_2D) glBindTexture(GL_TEXTURE_2D, self.texture) glColor4f(1, 1, 1, 1) glBegin(GL_QUADS) glTexCoord2f(0, 1) glVertex3f(-1, -1, 0) glTexCoord2f(1, 1) glVertex3f(1, -1, 0) glTexCoord2f(1, 0) glVertex3f(1, 1, 0) glTexCoord2f(0, 0) glVertex3f(-1, 1, 0) glEnd() glDisable(GL_TEXTURE_2D)