# 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']

    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.
        """

        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()

        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)