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import sys
from vtkmodules.vtkFiltersSources import vtkCylinderSource
from vtkmodules.vtkIOCore import vtkBase64Utilities
from vtkmodules.vtkRenderingCore import (
vtkActor,
vtkPolyDataMapper,
vtkRenderWindow,
vtkRenderer,
vtkWindowToImageFilter,
)
from vtkmodules.vtkTestingRendering import vtkTesting
from vtkmodules.vtkWebCore import vtkDataEncoder
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
import array
from vtkmodules.test import Testing
class TestDataEncoder(Testing.vtkTest):
def testEncodings(self):
# Render something
cylinder = vtkCylinderSource()
cylinder.SetResolution(8)
cylinderMapper = vtkPolyDataMapper()
cylinderMapper.SetInputConnection(cylinder.GetOutputPort())
cylinderActor = vtkActor()
cylinderActor.SetMapper(cylinderMapper)
cylinderActor.RotateX(30.0)
cylinderActor.RotateY(-45.0)
ren = vtkRenderer()
renWin = vtkRenderWindow()
renWin.AddRenderer(ren)
ren.AddActor(cylinderActor)
renWin.SetSize(200, 200)
ren.ResetCamera()
ren.GetActiveCamera().Zoom(1.5)
renWin.Render()
# Get a vtkImageData with the rendered output
w2if = vtkWindowToImageFilter()
w2if.SetInput(renWin)
w2if.SetShouldRerender(1)
w2if.SetReadFrontBuffer(0)
w2if.Update()
imgData = w2if.GetOutput()
# Use vtkDataEncoder to convert the image to PNG format and Base64 encode it
encoder = vtkDataEncoder()
base64String = encoder.EncodeAsBase64Png(imgData).encode('ascii')
# Now Base64 decode the string back to PNG image data bytes
inputArray = array.array('B', base64String)
outputBuffer = bytearray(len(inputArray))
try:
utils = vtkBase64Utilities()
except:
print('Unable to import required vtkBase64Utilities')
raise Exception("TestDataEncoder failed.")
actualLength = utils.DecodeSafely(inputArray, len(inputArray), outputBuffer, len(outputBuffer))
outputArray = bytearray(actualLength)
outputArray[:] = outputBuffer[0:actualLength]
# And write those bytes to the disk as an actual PNG image file
with open('TestDataEncoder.png', 'wb') as fd:
fd.write(outputArray)
# Create a vtkTesting object and specify a baseline image
rtTester = vtkTesting()
for arg in sys.argv[1:]:
rtTester.AddArgument(arg)
rtTester.AddArgument("-V")
rtTester.AddArgument("TestDataEncoder.png")
# Perform the image comparison test and print out the result.
result = rtTester.RegressionTest("TestDataEncoder.png", 0.05)
if result == 0:
raise Exception("TestDataEncoder failed.")
if __name__ == "__main__":
Testing.main([(TestDataEncoder, 'test')])
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