#!/usr/bin/env pytest
###############################################################################
# $Id: vrtfilt.py 3ea1cb89d5dccaea43fecf7aa9aee474abd27f8a 2020-05-10 16:21:22 +0200 Even Rouault $
#
# Project:  GDAL/OGR Test Suite
# Purpose:  Test VRT driver based filtering.
# Author:   Frank Warmerdam <warmerdam@pobox.com>
#
###############################################################################
# Copyright (c) 2003, Frank Warmerdam <warmerdam@pobox.com>
# Copyright (c) 2008-2010, Even Rouault <even dot rouault at spatialys.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################

from osgeo import gdal


import gdaltest
import pytest

###############################################################################
# Verify simple 3x3 averaging filter.


def test_vrtfilt_1():

    tst = gdaltest.GDALTest('VRT', 'vrt/avfilt.vrt', 1, 21890)
    return tst.testOpen()

###############################################################################
# Verify simple 3x3 averaging filter (normalized) on a dataset with nodata


def test_vrtfilt_2():

    ds = gdal.Open('data/vrt/test_vrt_filter_nodata.tif')
    checksum = ds.GetRasterBand(1).Checksum()
    ds = None

    # This is a black&white checkboard, where black = nodata
    # Thus averaging it and taking nodata into account will not change it
    tst = gdaltest.GDALTest('VRT', 'vrt/avfilt_nodata.vrt', 1, checksum)
    return tst.testOpen()

###############################################################################
# Try SetMetadataItem('source_0', xml, 'vrt_sources') (fix for #3052).
# Same result expected as for vrtfilt_1


def test_vrtfilt_3():

    ds = gdal.OpenShared('data/rgbsmall.tif')
    vrt_ds = gdal.GetDriverByName('VRT').CreateCopy('', ds)
    ds = None

    filterSourceXML = """    <KernelFilteredSource>
      <SourceFilename>data/rgbsmall.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <DstRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <Kernel>
        <Size>3</Size>
        <Coefs>0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111</Coefs>
      </Kernel>
    </KernelFilteredSource>"""

    try:
        vrt_ds.GetRasterBand(1).SetMetadataItem
    except:
        pytest.skip()

    vrt_ds.GetRasterBand(1).SetMetadataItem('source_0', filterSourceXML, 'vrt_sources')
    assert vrt_ds.GetRasterBand(1).Checksum() == 21890

###############################################################################
# Variant for SetMetadataItem('source_0', xml, 'vrt_sources')


def test_vrtfilt_4():

    vrt_ds = gdal.GetDriverByName('VRT').Create('', 50, 50, 1)

    filterSourceXML = """    <KernelFilteredSource>
      <SourceFilename>data/rgbsmall.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <DstRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <Kernel>
        <Size>3</Size>
        <Coefs>0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111</Coefs>
      </Kernel>
    </KernelFilteredSource>"""

    try:
        vrt_ds.GetRasterBand(1).SetMetadataItem
    except:
        pytest.skip()

    vrt_ds.GetRasterBand(1).SetMetadataItem('source_0', filterSourceXML, 'new_vrt_sources')
    assert vrt_ds.GetRasterBand(1).Checksum() == 21890

###############################################################################
# Variant for SetMetadata(md, 'vrt_sources')


def test_vrtfilt_5():

    vrt_ds = gdal.GetDriverByName('VRT').Create('', 50, 50, 1)

    filterSourceXML = """    <KernelFilteredSource>
      <SourceFilename>data/rgbsmall.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <DstRect xOff="0" yOff="0" xSize="50" ySize="50"/>
      <Kernel>
        <Size>3</Size>
        <Coefs>0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111</Coefs>
      </Kernel>
    </KernelFilteredSource>"""

    md = {}
    md['source_0'] = filterSourceXML

    vrt_ds.GetRasterBand(1).SetMetadata(md, 'vrt_sources')
    assert vrt_ds.GetRasterBand(1).Checksum() == 21890

###############################################################################
# Verify separable Gaussian blur filter.


def test_vrtfilt_6():

    tst = gdaltest.GDALTest('VRT', 'vrt/avfilt_1d.vrt', 1, 22377)
    return tst.testOpen()

###############################################################################
# Test block access


def test_vrtfilt_7():

    gdal.Translate('/vsimem/src.tif', 'data/rgbsmall.tif', options='-outsize 500 500 -r bilinear')

    vrt_ds = gdal.GetDriverByName('VRT').Create('/vsimem/src.vrt', 500, 500, 1)

    filterSourceXML = """    <KernelFilteredSource>
      <SourceFilename>/vsimem/src.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="0" xSize="500" ySize="500"/>
      <DstRect xOff="0" yOff="0" xSize="500" ySize="500"/>
      <Kernel>
        <Size>3</Size>
        <Coefs>0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111 0.111111</Coefs>
      </Kernel>
    </KernelFilteredSource>"""

    md = {}
    md['source_0'] = filterSourceXML

    vrt_ds.GetRasterBand(1).SetMetadata(md, 'vrt_sources')

    ref_checksum = vrt_ds.GetRasterBand(1).Checksum()
    vrt_ds = None

    # Wrap our above VRT in a VRT that will use 128x128 blocks
    # (use of -mo FOO=BAR forces a non trivial copy to be made)
    out_ds = gdal.Translate('', '/vsimem/src.vrt', options='-of VRT -mo FOO=BAR')
    assert ref_checksum == out_ds.GetRasterBand(1).Checksum()
    out_ds = None

    gdal.GetDriverByName('GTiff').Delete('/vsimem/src.tif')
    gdal.GetDriverByName('VRT').Delete('/vsimem/src.vrt')

###############################################################################
# Cleanup.


def test_vrtfilt_cleanup():
    pass


