from PyQt6 import QtCore, QtGui, sip

app = QtGui.QGuiApplication([])
array = sip.array(QtGui.QPainter.PixmapFragment, 0)
print(array)

pix = QtGui.QPixmap(51, 51)
pix.fill(QtCore.Qt.GlobalColor.cyan)

qimg = QtGui.QImage(200, 200, QtGui.QImage.Format.Format_RGB32)
qimg.fill(QtCore.Qt.GlobalColor.white)
painter = QtGui.QPainter(qimg)
painter.drawPixmapFragments(array, pix)
painter.end()

print('done')

import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui, QtWidgets

class CheckerBoardItem(pg.GraphicsObject):
    def __init__(self, size):
        super().__init__()
        self.size = size

        x = np.arange(self.size)
        y = np.arange(self.size)[:, np.newaxis]
        bitmap = (y & 1) ^ (x & 1)
        X, Y = np.meshgrid(x, y)
        nzidx = bitmap.nonzero()

        self.array = pg.Qt.internals.PrimitiveArray(QtCore.QRectF, 4)
        self.array.resize(nzidx[0].size)
        memory = self.array.ndarray()
        memory[:, 0] = X[nzidx]
        memory[:, 1] = Y[nzidx]
        memory[:, 2:4] = 1

    def paint(self, painter, *args):
        rect = QtCore.QRectF(0, 0, self.size, self.size)
        painter.fillRect(rect, QtCore.Qt.GlobalColor.blue)

        inst = self.array.instances()
        painter.setPen(QtCore.Qt.PenStyle.NoPen)
        painter.setBrush(QtCore.Qt.GlobalColor.white)
        painter.drawRects(inst)

    def boundingRect(self):
        return QtCore.QRectF(0, 0, self.size, self.size)

pg.mkQApp()
pw = pg.PlotWidget()
pw.show()
cbi = CheckerBoardItem(32)
pw.addItem(cbi)
pg.exec()