text: # -*- coding: utf-8 -*-
  """
  RawImageWidget.py
  Copyright 2010-2016 Luke Campagnola
  Distributed under MIT/X11 license. See license.txt for more infomation.
  """
  
  from .. import getConfigOption, functions as fn, getCupy
  from ..Qt import QtCore, QtGui, QtWidgets
  
  try:
      QOpenGLWidget = QtWidgets.QOpenGLWidget
      from OpenGL.GL import *
  
      HAVE_OPENGL = True
  except (ImportError, AttributeError):
      # Would prefer `except ImportError` here, but some versions of pyopengl generate
      # AttributeError upon import
      HAVE_OPENGL = False
  
  
  class RawImageWidget(QtGui.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.
      """
  
      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.
          """
          QtGui.QWidget.__init__(self, parent)
          self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding))
          self.scaled = scaled
          self.opts = None
          self.image = None
          self._cp = getCupy()
  
      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:
              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
              self.image = fn.makeQImage(argb, alpha, copy=False, transpose=False)
              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:
      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, alpha = 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_3D)
  