import os
from tempfile import TemporaryDirectory as InTemporaryDirectory
from urllib.request import urlretrieve
import warnings
from PIL import Image
import numpy as np
from fury.lib import (
BMPReader,
BMPWriter,
ImageData,
ImageFlip,
JPEGReader,
JPEGWriter,
MNIObjectReader,
MNIObjectWriter,
OBJReader,
PLYReader,
PLYWriter,
PNGReader,
PNGWriter,
PolyDataReader,
PolyDataWriter,
STLReader,
STLWriter,
TIFFReader,
TIFFWriter,
Texture,
XMLPolyDataReader,
XMLPolyDataWriter,
numpy_support,
)
from fury.utils import set_input
[docs]
def load_cubemap_texture(fnames, interpolate_on=True, mipmap_on=True):
"""Load a cube map texture from a list of 6 images.
Parameters
----------
fnames : list of strings
List of 6 filenames with bmp, jpg, jpeg, png, tif or tiff extensions.
interpolate_on : bool, optional
mipmap_on : bool, optional
Returns
-------
output : vtkTexture
Cube map texture.
"""
if len(fnames) != 6:
raise IOError("Expected 6 filenames, got {}".format(len(fnames)))
texture = Texture()
texture.CubeMapOn()
for idx, fn in enumerate(fnames):
if not os.path.isfile(fn):
raise FileNotFoundError(fn)
else:
# Read the images
vtk_img = load_image(fn, as_vtktype=True)
# Flip the image horizontally
img_flip = ImageFlip()
img_flip.SetInputData(vtk_img)
img_flip.SetFilteredAxis(1) # flip y axis
img_flip.Update()
# Add the image to the cube map
texture.SetInputDataObject(idx, img_flip.GetOutput())
if interpolate_on:
texture.InterpolateOn()
if mipmap_on:
texture.MipmapOn()
return texture
[docs]
def load_image(filename, as_vtktype=False, use_pillow=True):
"""Load an image.
Parameters
----------
filename: str
should be png, bmp, jpeg or jpg files
as_vtktype: bool, optional
if True, return vtk output otherwise an ndarray. Default False.
use_pillow: bool, optional
Use pillow python library to load the files. Default True
Returns
-------
image: ndarray or vtk output
desired image array
"""
is_url = filename.lower().startswith("http://") or filename.lower().startswith(
"https://"
)
if is_url:
image_name = os.path.basename(filename)
if len(image_name.split(".")) < 2:
raise IOError(f"{filename} is not a valid image URL")
urlretrieve(filename, image_name)
filename = image_name
if use_pillow:
with Image.open(filename) as pil_image:
if pil_image.mode in ["P"]:
pil_image = pil_image.convert("RGB")
if pil_image.mode in ["RGBA", "RGB", "L"]:
image = np.asarray(pil_image)
elif pil_image.mode.startswith("I;16"):
raw = pil_image.tobytes("raw", pil_image.mode)
dtype = ">u2" if pil_image.mode.endswith("B") else "<u2"
image = np.frombuffer(raw, dtype=dtype)
image.reshape(pil_image.size[::-1]).astype("=u2")
else:
try:
image = pil_image.convert("RGBA")
except ValueError as err:
raise RuntimeError(
"Unknown image mode {}".format(pil_image.mode)
) from err
image = np.asarray(pil_image)
if as_vtktype:
if image.ndim not in [2, 3]:
raise IOError("only 2D (L, RGB, RGBA) or 3D image available")
vtk_image = ImageData()
depth = 1 if image.ndim == 2 else image.shape[2]
# width, height
vtk_image.SetDimensions(image.shape[1], image.shape[0], depth)
vtk_image.SetExtent(0, image.shape[1] - 1, 0, image.shape[0] - 1, 0, 0)
vtk_image.SetSpacing(1.0, 1.0, 1.0)
vtk_image.SetOrigin(0.0, 0.0, 0.0)
image = np.flipud(image)
image = image.reshape(image.shape[1] * image.shape[0], depth)
image = np.ascontiguousarray(image, dtype=image.dtype)
vtk_array_type = numpy_support.get_vtk_array_type(image.dtype)
uchar_array = numpy_support.numpy_to_vtk(
image, deep=True, array_type=vtk_array_type
)
vtk_image.GetPointData().SetScalars(uchar_array)
image = vtk_image
if is_url:
os.remove(filename)
return image
d_reader = {
".png": PNGReader,
".bmp": BMPReader,
".jpeg": JPEGReader,
".jpg": JPEGReader,
".tiff": TIFFReader,
".tif": TIFFReader,
}
extension = os.path.splitext(os.path.basename(filename).lower())[1]
if extension.lower() not in d_reader.keys():
raise IOError(
"Impossible to read the file {0}: Unknown extension {1}".format(
filename, extension
)
)
reader = d_reader.get(extension)()
reader.SetFileName(filename)
reader.Update()
reader.GetOutput().GetPointData().GetArray(0).SetName("original")
if not as_vtktype:
w, h, _ = reader.GetOutput().GetDimensions()
vtk_array = reader.GetOutput().GetPointData().GetScalars()
components = vtk_array.GetNumberOfComponents()
image = numpy_support.vtk_to_numpy(vtk_array).reshape(h, w, components)
image = np.flipud(image)
if is_url:
os.remove(filename)
return reader.GetOutput() if as_vtktype else image
[docs]
def load_text(file):
"""Load a text file.
Parameters
----------
file: str
Path to the text file.
Returns
-------
text: str
Text contained in the file.
"""
if not os.path.isfile(file):
raise IOError("File {} does not exist.".format(file))
with open(file) as f:
text = f.read()
return text
[docs]
def save_image(
arr,
filename,
compression_quality=75,
compression_type="deflation",
use_pillow=True,
dpi=(72, 72),
):
"""Save a 2d or 3d image.
Expect an image with the following shape: (H, W) or (H, W, 1) or
(H, W, 3) or (H, W, 4).
Parameters
----------
arr : ndarray
array to save
filename : string
should be png, bmp, jpeg or jpg files
compression_quality : int, optional
compression_quality for jpeg data.
0 = Low quality, 100 = High quality
compression_type : str, optional
compression type for tiff file
select between: None, lzw, deflation (default)
use_pillow : bool, optional
Use imageio python library to save the files.
dpi : float or (float, float)
Dots per inch (dpi) for saved image.
Single values are applied as dpi for both dimensions.
"""
if arr.ndim > 3:
raise IOError("Image Dimensions should be <=3")
if isinstance(dpi, (float, int)):
dpi = (dpi, dpi)
d_writer = {
".png": PNGWriter,
".bmp": BMPWriter,
".jpeg": JPEGWriter,
".jpg": JPEGWriter,
".tiff": TIFFWriter,
".tif": TIFFWriter,
}
extension = os.path.splitext(os.path.basename(filename).lower())[1]
if extension.lower() not in d_writer.keys():
raise IOError(
"Impossible to save the file {0}: Unknown extension {1}".format(
filename, extension
)
)
if use_pillow:
im = Image.fromarray(arr)
im.save(filename, quality=compression_quality, dpi=dpi)
else:
warnings.warn(
UserWarning("DPI value is ignored while saving images via vtk."),
stacklevel=2,
)
if arr.ndim == 2:
arr = arr[..., None]
shape = arr.shape
arr = np.flipud(arr)
if extension.lower() in [
".png",
]:
arr = arr.astype(np.uint8)
arr = arr.reshape((shape[1] * shape[0], shape[2]))
arr = np.ascontiguousarray(arr, dtype=arr.dtype)
vtk_array_type = numpy_support.get_vtk_array_type(arr.dtype)
vtk_array = numpy_support.numpy_to_vtk(
num_array=arr, deep=True, array_type=vtk_array_type
)
# Todo, look the following link for managing png 16bit
# https://stackoverflow.com/questions/15667947/vtkpngwriter-printing-out-black-images
vtk_data = ImageData()
vtk_data.SetDimensions(shape[1], shape[0], shape[2])
vtk_data.SetExtent(0, shape[1] - 1, 0, shape[0] - 1, 0, 0)
vtk_data.SetSpacing(1.0, 1.0, 1.0)
vtk_data.SetOrigin(0.0, 0.0, 0.0)
vtk_data.GetPointData().SetScalars(vtk_array)
writer = d_writer.get(extension)()
writer.SetFileName(filename)
writer.SetInputData(vtk_data)
if extension.lower() in [".jpg", ".jpeg"]:
writer.ProgressiveOn()
writer.SetQuality(compression_quality)
if extension.lower() in [".tif", ".tiff"]:
compression_type = compression_type or "nocompression"
l_compression = ["nocompression", "packbits", "jpeg", "deflate", "lzw"]
if compression_type.lower() in l_compression:
comp_id = l_compression.index(compression_type.lower())
writer.SetCompression(comp_id)
else:
writer.SetCompressionToDeflate()
writer.Write()
[docs]
def load_polydata(file_name):
"""Load a vtk polydata to a supported format file.
Supported file formats are VTK, VTP, FIB, PLY, STL XML and OBJ
Parameters
----------
file_name : string
Returns
-------
output : vtkPolyData
"""
# Check if file actually exists
if not os.path.isfile(file_name):
raise FileNotFoundError(file_name)
file_extension = file_name.split(".")[-1].lower()
poly_reader = {
"vtk": PolyDataReader,
"vtp": XMLPolyDataReader,
"fib": PolyDataReader,
"ply": PLYReader,
"stl": STLReader,
"xml": XMLPolyDataReader,
}
if file_extension in poly_reader.keys():
reader = poly_reader.get(file_extension)()
elif file_extension == "obj":
# Special case, since there is two obj format
reader = OBJReader()
reader.SetFileName(file_name)
reader.Update()
if reader.GetOutput().GetNumberOfCells() == 0:
reader = MNIObjectReader()
else:
raise IOError("." + file_extension + " is not supported by FURY")
reader.SetFileName(file_name)
reader.Update()
return reader.GetOutput()
[docs]
def save_polydata(polydata, file_name, binary=False, color_array_name=None):
"""Save a vtk polydata to a supported format file.
Save formats can be VTK, FIB, PLY, STL and XML.
Parameters
----------
polydata : vtkPolyData
file_name : string
binary : bool
color_array_name: ndarray
"""
# get file extension (type)
file_extension = file_name.split(".")[-1].lower()
poly_writer = {
"vtk": PolyDataWriter,
"vtp": XMLPolyDataWriter,
"fib": PolyDataWriter,
"ply": PLYWriter,
"stl": STLWriter,
"xml": XMLPolyDataWriter,
}
if file_extension in poly_writer.keys():
writer = poly_writer.get(file_extension)()
elif file_extension == "obj":
# Special case, since there is two obj format
find_keyword = file_name.lower().split(".")
if "mni" in find_keyword or "mnc" in find_keyword:
writer = MNIObjectWriter()
else:
raise IOError(
"Wavefront obj requires a scene \n"
" for MNI obj, use '.mni.obj' extension"
)
else:
raise IOError("." + file_extension + " is not supported by FURY")
writer.SetFileName(file_name)
writer = set_input(writer, polydata)
if color_array_name is not None and file_extension == "ply":
writer.SetArrayName(color_array_name)
if binary:
writer.SetFileTypeToBinary()
writer.Update()
writer.Write()
[docs]
def load_sprite_sheet(sheet_path, nb_rows, nb_cols, as_vtktype=False):
"""Process and load sprites from a sprite sheet.
Parameters
----------
sheet_path: str
Path to the sprite sheet
nb_rows: int
Number of rows in the sprite sheet
nb_cols: int
Number of columns in the sprite sheet
as_vtktype: bool, optional
If True, the output is a vtkImageData
Returns
-------
Dict containing the processed sprites.
"""
sprite_dicts = {}
sprite_sheet = load_image(sheet_path)
width, height = sprite_sheet.shape[:2]
sprite_size_x = int(np.ceil(width / nb_rows))
sprite_size_y = int(np.ceil(height / nb_cols))
for row, col in np.ndindex((nb_rows, nb_cols)):
nxt_row = row + 1
nxt_col = col + 1
box = (
row * sprite_size_x,
col * sprite_size_y,
nxt_row * sprite_size_x,
nxt_col * sprite_size_y,
)
sprite_arr = sprite_sheet[box[0] : box[2], box[1] : box[3]]
if as_vtktype:
with InTemporaryDirectory() as tdir:
tmp_img_path = os.path.join(tdir, f"{row}{col}.png")
save_image(sprite_arr, tmp_img_path, compression_quality=100)
sprite_dicts[(row, col)] = load_image(tmp_img_path, as_vtktype=True)
else:
sprite_dicts[(row, col)] = sprite_arr
return sprite_dicts
