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#!/usr/bin/env python
import os
import sys
from vtkmodules.vtkCommonCore import vtkCommand
from vtkmodules.vtkIOImage import (
vtkPNGReader,
vtkPNGWriter,
vtkTIFFReader,
)
from vtkmodules.util.misc import vtkGetDataRoot,vtkGetTempDir
gotWarning = False
gotError = False
def WarningCallback(obj, evt):
global gotWarning
gotWarning = True
VTK_DATA_ROOT = vtkGetDataRoot()
VTK_TEMP_DIR = vtkGetTempDir()
# Image pipeline
image1 = vtkTIFFReader()
image1.SetFileName(VTK_DATA_ROOT + "/Data/beach.tif")
# "beach.tif" image contains ORIENTATION tag which is
# ORIENTATION_TOPLEFT (row 0 top, col 0 lhs) type. The TIFF
# reader parses this tag and sets the internal TIFF image
# orientation accordingly. To overwrite this orientation with a vtk
# convention of ORIENTATION_BOTLEFT (row 0 bottom, col 0 lhs ), invoke
# SetOrientationType method with parameter value of 4.
image1.SetOrientationType(4)
image1.Update()
filename = VTK_TEMP_DIR + "/" + "pngw1.png"
testKey = "test key"
testValue = "test value"
longKey = "0123456789012345678901234567890123456789"\
"0123456789012345678901234567890123456789"
longKeyValue = "this also prints a warning"
try:
# Can we write to the directory?
channel = open(filename, "wb")
channel.close()
writer = vtkPNGWriter()
writer.SetInputConnection(image1.GetOutputPort())
writer.SetFileName(filename)
writer.AddText(testKey, testValue);
# this is fine
writer.AddText(testKey, testValue);
# test clearing the text
writer.ClearText()
# add back the expected keys and values
writer.AddText(testKey, testValue);
writer.AddText(testKey, testValue);
observerId = writer.AddObserver(vtkCommand.WarningEvent, WarningCallback)
# this prints a warning and does not add the text chunk
writer.AddText("", "this prints a warning")
if (not gotWarning):
print("Error: expect warning when adding a text chunk with empty key")
gotError = True
gotWarning = False
# this prints a warning and add a text chunk with a truncated key
writer.AddText(longKey, longKeyValue)
if (not gotWarning):
print("Error: expect warning when adding a text chunk "\
"with key length bigger than 79 characters")
gotError = True
writer.RemoveObserver(observerId)
writer.Write()
reader = vtkPNGReader()
reader.SetFileName(filename);
reader.Update();
if (reader.GetNumberOfTextChunks() != 3):
print("Error: Expecting three text chunks in the PNG file but got",\
reader.GetNumberOfTextChunks())
gotError = True
beginEnd = [0, 0]
reader.GetTextChunks(testKey,beginEnd)
# the key starting with 0 comes in first.
if (beginEnd[0] != 1 and beginEnd[1] != 3):
print("Error: expect \"%s\" at index 1 and 2 but got "\
"them at positions %d and %d" % (testKey, beginEnd[0], beginEnd[1]))
gotError = True
if (reader.GetTextKey(1) != testKey or reader.GetTextKey(2) != testKey):
print("Error: expecting key \"%s\" at index 1 and 2 but got \"%s\"" % \
(testKey, reader.GetTextKey(1)))
gotError = True
if (reader.GetTextValue(1) != testValue or reader.GetTextValue(2) != testValue):
print("Error: expecting value \"%s\" at index 1 and 2 but got \"%s\"" % \
(testValue, reader.GetTextValue(1)))
gotError = True
if (reader.GetTextKey(0) != longKey[:-1]):
print("Error: expecting value \"%s\" at index but got \"%s\"" % \
(longKey[:-1], reader.GetTextKey(0)))
gotError = True
if (gotError):
sys.exit(1)
else:
sys.exit(0)
except IOError:
print("Error: Unable to test PNG write/read of text chunks.")
sys.exit(1)
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