checkerBoardFast.py

Faster method to create a checkerboard pattern in a memory image view The image is written tile by tile, using a buffer to write the tile values at once.

Faster method to create a checkerboard pattern in a memory image view The image is written tile by tile, using a buffer to write the tile values at once.

import iolink
 
from array import array
 
import timeit
 
 
def checkerBoard_Fast(sideLength):
    shape = iolink.VectorXu64(sideLength, sideLength)
    dt = iolink.DataTypeId.UINT8
 
    # allocate the image in memory
    image = iolink.ImageViewFactory.allocate(shape, dt)
 
    tileCount = 10
 
    # for a uint8 grayscale image, define the two color values to use
    blackValue = 0
    whiteValue = 255
 
    # compute the size of a tile (width and height are the same)
    tileSize = shape / tileCount
    regionTile = iolink.RegionXu64.create_full_region(tileSize)
 
    # allocate 2 buffers, one filled with black value, and the other with one value
    # we use the computed region to know the needed size of buffers
    blackBuf = array('B', [blackValue] * regionTile.element_count)
    whiteBuf = array('B', [whiteValue] * regionTile.element_count)
 
    # for each tile of the grid on X and Y axis
    for tileX in range(0, tileCount):
        for tileY in range(0, tileCount):
            # compute the origin position of the region to write
            origin = iolink.VectorXu64(tileX, tileY) * tileSize
            regionTile = iolink.RegionXu64(origin, tileSize)
            # write the black buffer or white buffer according to the tile index
            if ( (tileX + tileY) % 2 == 0):
                image.write_region(regionTile, blackBuf)
            else:
                image.write_region(regionTile, whiteBuf)
 
    return image
 
start = timeit.default_timer()
img = checkerBoard_Fast(1000)
stop = timeit.default_timer()
print('CheckerBoard fast method created in: ', stop - start, "s")
 
print("Generated ImageView:", str(img))
 
 
 
# from PIL import Image
# import numpy as np
 
 
 
#img.save("checkerboard.png")
#img.show()
 
 
print("SUCCESS")