# vim: set fileencoding=utf-8 :

import sys
import os
import shutil
import tempfile
import pytest

import pyvips
from helpers import \
    JPEG_FILE, SRGB_FILE, MATLAB_FILE, PNG_FILE, TIF_FILE, OME_FILE, \
    ANALYZE_FILE, GIF_FILE, WEBP_FILE, EXR_FILE, FITS_FILE, OPENSLIDE_FILE, \
    PDF_FILE, SVG_FILE, SVGZ_FILE, SVG_GZ_FILE, GIF_ANIM_FILE, DICOM_FILE, \
    BMP_FILE, NIFTI_FILE, ICO_FILE, HEIC_FILE, TRUNCATED_FILE, \
    temp_filename, assert_almost_equal_objects, have, skip_if_no


class TestForeign:
    tempdir = None

    @classmethod
    def setup_class(cls):
        cls.tempdir = tempfile.mkdtemp()

        cls.colour = pyvips.Image.jpegload(JPEG_FILE)
        cls.mono = cls.colour.extract_band(1).copy()
        # we remove the ICC profile: the RGB one will no longer be appropriate
        cls.mono.remove("icc-profile-data")
        cls.rad = cls.colour.float2rad().copy()
        cls.rad.remove("icc-profile-data")
        cls.cmyk = cls.colour.bandjoin(cls.mono)
        cls.cmyk = cls.cmyk.copy(interpretation=pyvips.Interpretation.CMYK)
        cls.cmyk.remove("icc-profile-data")

        im = pyvips.Image.new_from_file(GIF_FILE)
        cls.onebit = im > 128

    @classmethod
    def teardown_class(cls):
        shutil.rmtree(cls.tempdir, ignore_errors=True)
        cls.colour = None
        cls.mono = None
        cls.rad = None
        cls.cmyk = None
        cls.onebit = None

    # we have test files for formats which have a clear standard
    def file_loader(self, loader, test_file, validate):
        im = pyvips.Operation.call(loader, test_file)
        validate(im)
        im = pyvips.Image.new_from_file(test_file)
        validate(im)

    def buffer_loader(self, loader, test_file, validate):
        with open(test_file, 'rb') as f:
            buf = f.read()

        im = pyvips.Operation.call(loader, buf)
        validate(im)
        im = pyvips.Image.new_from_buffer(buf, "")
        validate(im)

    def save_load(self, format, im):
        x = pyvips.Image.new_temp_file(format)
        im.write(x)

        assert im.width == x.width
        assert im.height == x.height
        assert im.bands == x.bands
        max_diff = (im - x).abs().max()
        assert max_diff == 0

    def save_load_file(self, format, options, im, thresh):
        # yuk!
        # but we can't set format parameters for pyvips.Image.new_temp_file()
        filename = temp_filename(self.tempdir, format)

        im.write_to_file(filename + options)
        x = pyvips.Image.new_from_file(filename)

        assert im.width == x.width
        assert im.height == x.height
        assert im.bands == x.bands
        max_diff = (im - x).abs().max()
        assert max_diff <= thresh
        x = None

    def save_load_buffer(self, saver, loader, im, max_diff=0, **kwargs):
        buf = pyvips.Operation.call(saver, im, **kwargs)
        x = pyvips.Operation.call(loader, buf)

        assert im.width == x.width
        assert im.height == x.height
        assert im.bands == x.bands
        assert (im - x).abs().max() <= max_diff

    def save_buffer_tempfile(self, saver, suf, im, max_diff=0):
        filename = temp_filename(self.tempdir, suf)

        buf = pyvips.Operation.call(saver, im)
        f = open(filename, 'wb')
        f.write(buf)
        f.close()

        x = pyvips.Image.new_from_file(filename)

        assert im.width == x.width
        assert im.height == x.height
        assert im.bands == x.bands
        assert (im - x).abs().max() <= max_diff

    def test_vips(self):
        self.save_load_file(".v", "", self.colour, 0)

        # check we can save and restore metadata
        filename = temp_filename(self.tempdir, ".v")
        self.colour.write_to_file(filename)
        x = pyvips.Image.new_from_file(filename)
        before_exif = self.colour.get("exif-data")
        after_exif = x.get("exif-data")

        assert len(before_exif) == len(after_exif)
        for i in range(len(before_exif)):
            assert before_exif[i] == after_exif[i]

        x = None

    @skip_if_no("jpegload")
    def test_jpeg(self):
        def jpeg_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [141, 127, 90])
            profile = im.get("icc-profile-data")
            assert len(profile) == 564
            assert im.width == 290
            assert im.height == 442
            assert im.bands == 3

        self.file_loader("jpegload", JPEG_FILE, jpeg_valid)
        self.save_load("%s.jpg", self.mono)
        self.save_load("%s.jpg", self.colour)

        self.buffer_loader("jpegload_buffer", JPEG_FILE, jpeg_valid)
        self.save_load_buffer("jpegsave_buffer", "jpegload_buffer",
                              self.colour, 80)

        # see if we have exif parsing: our test image has this field
        x = pyvips.Image.new_from_file(JPEG_FILE)
        if x.get_typeof("exif-ifd0-Orientation") != 0:
            # we need a copy of the image to set the new metadata on
            # otherwise we get caching problems

            # can set, save and load new orientation
            x = pyvips.Image.new_from_file(JPEG_FILE)
            x = x.copy()

            x.set("orientation", 2)

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("orientation")
            assert y == 2

            # can remove orientation, save, load again, orientation
            # has reset
            x = x.copy()
            x.remove("orientation")

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("orientation")
            assert y == 1

            # autorotate load works
            x = pyvips.Image.new_from_file(JPEG_FILE)
            x = x.copy()

            x.set("orientation", 6)

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x1 = pyvips.Image.new_from_file(filename)
            x2 = pyvips.Image.new_from_file(filename, autorotate=True)
            assert x1.width == x2.height
            assert x1.height == x2.width

            # sets incorrect orientation, save, load again, orientation
            # has reset to 1
            x = x.copy()
            x.set("orientation", 256)

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("orientation")
            assert y == 1

            # can set, save and reload ASCII string fields
            x = pyvips.Image.new_from_file(JPEG_FILE)
            x = x.copy()

            x.set_type(pyvips.GValue.gstr_type, 
                       "exif-ifd0-ImageDescription", "hello world")

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("exif-ifd0-ImageDescription")
            # can't use == since the string will have an extra " (xx, yy, zz)" 
            # format area at the end
            assert y.startswith("hello world")

            # can set, save and reload UTF16 string fields ... pyvips is 
            # utf8, but it will be coded as utf16 and back for the XP* fields
            x = pyvips.Image.new_from_file(JPEG_FILE)
            x = x.copy()

            x.set_type(pyvips.GValue.gstr_type, "exif-ifd0-XPComment", u"йцук")

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("exif-ifd0-XPComment")
            # can't use == since the string will have an extra " (xx, yy, zz)" 
            # format area at the end
            assert y.startswith(u"йцук")

            # can set/save/load UserComment, a tag which has the
            # encoding in the first 8 bytes ... though libexif only supports
            # ASCII for this
            x = pyvips.Image.new_from_file(JPEG_FILE)
            x = x.copy()

            x.set_type(pyvips.GValue.gstr_type, 
                       "exif-ifd2-UserComment", "hello world")

            filename = temp_filename(self.tempdir, '.jpg')
            x.write_to_file(filename)

            x = pyvips.Image.new_from_file(filename)
            y = x.get("exif-ifd2-UserComment")
            # can't use == since the string will have an extra " (xx, yy, zz)" 
            # format area at the end
            assert y.startswith("hello world")

    @skip_if_no("jpegload")
    def test_truncated(self):
        # This should open (there's enough there for the header)
        im = pyvips.Image.new_from_file(TRUNCATED_FILE)
        # but this should fail with a warning, and knock TRUNCATED_FILE out of
        # the cache
        x = im.avg()

        # now we should open again, but it won't come from cache, it'll reload
        im = pyvips.Image.new_from_file(TRUNCATED_FILE)
        # and this should fail with a warning once more
        x = im.avg()

    @skip_if_no("pngload")
    def test_png(self):
        def png_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [38671.0, 33914.0, 26762.0])
            assert im.width == 290
            assert im.height == 442
            assert im.bands == 3

        self.file_loader("pngload", PNG_FILE, png_valid)
        self.buffer_loader("pngload_buffer", PNG_FILE, png_valid)
        self.save_load_buffer("pngsave_buffer", "pngload_buffer", self.colour)
        self.save_load("%s.png", self.mono)
        self.save_load("%s.png", self.colour)
        self.save_load_file(".png", "[interlace]", self.colour, 0)
        self.save_load_file(".png", "[interlace]", self.mono, 0)

    @skip_if_no("tiffload")
    def test_tiff(self):
        def tiff_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [38671.0, 33914.0, 26762.0])
            assert im.width == 290
            assert im.height == 442
            assert im.bands == 3

        self.file_loader("tiffload", TIF_FILE, tiff_valid)
        self.buffer_loader("tiffload_buffer", TIF_FILE, tiff_valid)
        if pyvips.at_least_libvips(8, 5):
            self.save_load_buffer("tiffsave_buffer",
                                  "tiffload_buffer",
                                  self.colour)
        self.save_load("%s.tif", self.mono)
        self.save_load("%s.tif", self.colour)
        self.save_load("%s.tif", self.cmyk)

        self.save_load("%s.tif", self.onebit)
        self.save_load_file(".tif", "[squash]", self.onebit, 0)
        self.save_load_file(".tif", "[miniswhite]", self.onebit, 0)
        self.save_load_file(".tif", "[squash,miniswhite]", self.onebit, 0)

        self.save_load_file(".tif",
                            "[profile={0}]".format(SRGB_FILE),
                            self.colour, 0)
        self.save_load_file(".tif", "[tile]", self.colour, 0)
        self.save_load_file(".tif", "[tile,pyramid]", self.colour, 0)
        self.save_load_file(".tif",
                            "[tile,pyramid,compression=jpeg]", self.colour, 80)
        self.save_load_file(".tif", "[bigtiff]", self.colour, 0)
        self.save_load_file(".tif", "[compression=jpeg]", self.colour, 80)
        self.save_load_file(".tif",
                            "[tile,tile-width=256]", self.colour, 10)

        filename = temp_filename(self.tempdir, '.tif')
        x = pyvips.Image.new_from_file(TIF_FILE)
        x = x.copy()
        x.set("orientation", 2)
        x.write_to_file(filename)
        x = pyvips.Image.new_from_file(filename)
        y = x.get("orientation")
        assert y == 2

        filename = temp_filename(self.tempdir, '.tif')
        x = pyvips.Image.new_from_file(TIF_FILE)
        x = x.copy()
        x.set("orientation", 2)
        x.write_to_file(filename)
        x = pyvips.Image.new_from_file(filename)
        y = x.get("orientation")
        assert y == 2
        x = x.copy()
        x.remove("orientation")

        filename = temp_filename(self.tempdir, '.tif')
        x.write_to_file(filename)
        x = pyvips.Image.new_from_file(filename)
        y = x.get("orientation")
        assert y == 1

        filename = temp_filename(self.tempdir, '.tif')
        x = pyvips.Image.new_from_file(TIF_FILE)
        x = x.copy()
        x.set("orientation", 6)
        x.write_to_file(filename)
        x1 = pyvips.Image.new_from_file(filename)
        x2 = pyvips.Image.new_from_file(filename, autorotate=True)
        assert x1.width == x2.height
        assert x1.height == x2.width

        filename = temp_filename(self.tempdir, '.tif')
        x = pyvips.Image.new_from_file(TIF_FILE)
        x = x.copy()
        x.write_to_file(filename, xres=100, yres=200, resunit="cm")
        x1 = pyvips.Image.new_from_file(filename)
        assert x1.get("resolution-unit") == "cm"
        assert x1.xres == 100
        assert x1.yres == 200

        filename = temp_filename(self.tempdir, '.tif')
        x = pyvips.Image.new_from_file(TIF_FILE)
        x = x.copy()
        x.write_to_file(filename, xres=100, yres=200, resunit="inch")
        x1 = pyvips.Image.new_from_file(filename)
        assert x1.get("resolution-unit") == "in"
        assert x1.xres == 100
        assert x1.yres == 200

        # OME support in 8.5
        x = pyvips.Image.new_from_file(OME_FILE)
        assert x.width == 439
        assert x.height == 167
        page_height = x.height

        x = pyvips.Image.new_from_file(OME_FILE, n=-1)
        assert x.width == 439
        assert x.height == page_height * 15

        x = pyvips.Image.new_from_file(OME_FILE, page=1, n=-1)
        assert x.width == 439
        assert x.height == page_height * 14

        x = pyvips.Image.new_from_file(OME_FILE, page=1, n=2)
        assert x.width == 439
        assert x.height == page_height * 2

        x = pyvips.Image.new_from_file(OME_FILE, n=-1)
        assert x(0, 166)[0] == 96
        assert x(0, 167)[0] == 0
        assert x(0, 168)[0] == 1

        filename = temp_filename(self.tempdir, '.tif')
        x.write_to_file(filename)

        x = pyvips.Image.new_from_file(filename, n=-1)
        assert x.width == 439
        assert x.height == page_height * 15
        assert x(0, 166)[0] == 96
        assert x(0, 167)[0] == 0
        assert x(0, 168)[0] == 1

        # pyr save to buffer added in 8.6
        x = pyvips.Image.new_from_file(TIF_FILE)
        buf = x.tiffsave_buffer(tile=True, pyramid=True)
        filename = temp_filename(self.tempdir, '.tif')
        x.tiffsave(filename, tile=True, pyramid=True)
        with open(filename, 'rb') as f:
            buf2 = f.read()
        assert len(buf) == len(buf2)

        a = pyvips.Image.new_from_buffer(buf, "", page=2)
        b = pyvips.Image.new_from_buffer(buf2, "", page=2)
        assert a.width == b.width
        assert a.height == b.height
        assert a.avg() == b.avg()

        # region-shrink added in 8.7
        x = pyvips.Image.new_from_file(TIF_FILE)
        buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="mean")
        buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="mode")
        buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="median")

    @skip_if_no("magickload")
    def test_magickload(self):
        def bmp_valid(im):
            a = im(100, 100)

            assert_almost_equal_objects(a, [227, 216, 201])
            assert im.width == 1419
            assert im.height == 1001

        self.file_loader("magickload", BMP_FILE, bmp_valid)
        self.buffer_loader("magickload_buffer", BMP_FILE, bmp_valid)

        # we should have rgb or rgba for svg files ... different versions of
        # IM handle this differently. GM even gives 1 band.
        im = pyvips.Image.magickload(SVG_FILE)
        assert im.bands == 3 or im.bands == 4 or im.bands == 1

        # density should change size of generated svg
        im = pyvips.Image.magickload(SVG_FILE, density='100')
        width = im.width
        height = im.height
        im = pyvips.Image.magickload(SVG_FILE, density='200')
        # This seems to fail on travis, no idea why, some problem in their IM
        # perhaps
        # assert im.width == width * 2
        # assert im.height == height * 2

        im = pyvips.Image.magickload(GIF_ANIM_FILE)
        width = im.width
        height = im.height
        im = pyvips.Image.magickload(GIF_ANIM_FILE, n=-1)
        assert im.width == width
        assert im.height == height * 5

        # page/n let you pick a range of pages
        # 'n' param added in 8.5
        if pyvips.at_least_libvips(8, 5):
            im = pyvips.Image.magickload(GIF_ANIM_FILE)
            width = im.width
            height = im.height
            im = pyvips.Image.magickload(GIF_ANIM_FILE, page=1, n=2)
            assert im.width == width
            assert im.height == height * 2
            page_height = im.get("page-height")
            assert page_height == height

        # should work for dicom
        im = pyvips.Image.magickload(DICOM_FILE)
        assert im.width == 128
        assert im.height == 128
        # some IMs are 3 bands, some are 1, can't really test
        # assert im.bands == 1

        # libvips has its own sniffer for ICO, test that
        with open(ICO_FILE, 'rb') as f:
            buf = f.read()

        im = pyvips.Image.new_from_buffer(buf, "")
        assert im.width == 16
        assert im.height == 16

    # added in 8.7
    @skip_if_no("magicksave")
    def test_magicksave(self):
        # save to a file and load again ... we can't use save_load_file since
        # we want to make sure we use magickload/save 
        # don't use BMP - GraphicsMagick always adds an alpha
        # don't use TIF - IM7 will save as 16-bit
        filename = temp_filename(self.tempdir, ".jpg")

        self.colour.magicksave(filename)
        x = pyvips.Image.magickload(filename)

        assert self.colour.width == x.width
        assert self.colour.height == x.height
        assert self.colour.bands == x.bands
        max_diff = (self.colour - x).abs().max()
        assert max_diff < 60

        self.save_load_buffer("magicksave_buffer", "magickload_buffer",
                              self.colour, 60, format="JPG")

        # try an animation
        if have("gifload"):
            x1 = pyvips.Image.new_from_file(GIF_ANIM_FILE, n=-1)
            w1 = x1.magicksave_buffer(format="GIF")
            x2 = pyvips.Image.new_from_buffer(w1, "", n=-1)
            assert x1.get("delay") == x2.get("delay")
            assert x1.get("page-height") == x2.get("page-height")
            # magicks vary in how they handle this ... just pray we are close
            assert abs(x1.get("gif-loop") - x2.get("gif-loop")) < 5

    @skip_if_no("webpload")
    def test_webp(self):
        def webp_valid(im):
            a = im(10, 10)
            # different webp versions use different rounding systems leading
            # to small variations
            assert_almost_equal_objects(a, [71, 166, 236], threshold=2)
            assert im.width == 550
            assert im.height == 368
            assert im.bands == 3

        self.file_loader("webpload", WEBP_FILE, webp_valid)
        self.buffer_loader("webpload_buffer", WEBP_FILE, webp_valid)
        self.save_load_buffer("webpsave_buffer", "webpload_buffer",
                              self.colour, 60)
        self.save_load("%s.webp", self.colour)

        # test lossless mode
        im = pyvips.Image.new_from_file(WEBP_FILE)
        buf = im.webpsave_buffer(lossless=True)
        im2 = pyvips.Image.new_from_buffer(buf, "")
        assert abs(im.avg() - im2.avg()) < 1

        # higher Q should mean a bigger buffer
        b1 = im.webpsave_buffer(Q=10)
        b2 = im.webpsave_buffer(Q=90)
        assert len(b2) > len(b1)

        # try saving an image with an ICC profile and reading it back ... if we
        # can do it, our webp supports metadata load/save
        buf = self.colour.webpsave_buffer()
        im = pyvips.Image.new_from_buffer(buf, "")
        if im.get_typeof("icc-profile-data") != 0:
            # verify that the profile comes back unharmed
            p1 = self.colour.get("icc-profile-data")
            p2 = im.get("icc-profile-data")
            assert p1 == p2

            # add tests for exif, xmp, ipct
            # the exif test will need us to be able to walk the header,
            # we can't just check exif-data

            # we can test that exif changes change the output of webpsave
            # first make sure we have exif support
            z = pyvips.Image.new_from_file(JPEG_FILE)
            if z.get_typeof("exif-ifd0-Orientation") != 0:
                x = self.colour.copy()
                x.set("orientation", 6)
                buf = x.webpsave_buffer()
                y = pyvips.Image.new_from_buffer(buf, "")
                assert y.get("orientation") == 6

        # try converting an animated gif to webp ... can't do back to gif
        # again without IM support
        if have("gifload"):
            x1 = pyvips.Image.new_from_file(GIF_ANIM_FILE, n=-1)
            w1 = x1.webpsave_buffer(Q=10)

            x2 = pyvips.Image.new_from_buffer(w1, "", n=-1)
            assert x1.width == x2.width
            assert x1.height == x2.height
            assert x1.get("delay") == x2.get("delay")
            assert x1.get("page-height") == x2.get("page-height")
            assert x1.get("gif-loop") == x2.get("gif-loop")

    @skip_if_no("analyzeload")
    def test_analyzeload(self):
        def analyze_valid(im):
            a = im(10, 10)
            assert pytest.approx(a[0]) == 3335
            assert im.width == 128
            assert im.height == 8064
            assert im.bands == 1

        self.file_loader("analyzeload", ANALYZE_FILE, analyze_valid)

    @skip_if_no("matload")
    def test_matload(self):
        def matlab_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [38671.0, 33914.0, 26762.0])
            assert im.width == 290
            assert im.height == 442
            assert im.bands == 3

        self.file_loader("matload", MATLAB_FILE, matlab_valid)

    @skip_if_no("openexrload")
    def test_openexrload(self):
        def exr_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [0.124512, 0.159668, 0.040375, 
                                            255.0],
                                        threshold=0.00001)
            assert im.width == 610
            assert im.height == 406
            assert im.bands == 4

        self.file_loader("openexrload", EXR_FILE, exr_valid)

    @skip_if_no("fitsload")
    def test_fitsload(self):
        def fits_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [-0.165013, -0.148553, 1.09122,
                                            -0.942242], threshold=0.00001)
            assert im.width == 200
            assert im.height == 200
            assert im.bands == 4

        self.file_loader("fitsload", FITS_FILE, fits_valid)
        self.save_load("%s.fits", self.mono)

    @skip_if_no("niftiload")
    def test_niftiload(self):
        def nifti_valid(im):
            a = im(30, 26)
            assert_almost_equal_objects(a, [131])
            assert im.width == 91
            assert im.height == 9919
            assert im.bands == 1

        self.file_loader("niftiload", NIFTI_FILE, nifti_valid)
        self.save_load("%s.nii.gz", self.mono)

    @skip_if_no("openslideload")
    def test_openslideload(self):
        def openslide_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [244, 250, 243, 255])
            assert im.width == 2220
            assert im.height == 2967
            assert im.bands == 4

        self.file_loader("openslideload", OPENSLIDE_FILE, openslide_valid)

    @skip_if_no("pdfload")
    def test_pdfload(self):
        def pdf_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [35, 31, 32, 255])
            assert im.width == 1134
            assert im.height == 680
            assert im.bands == 4

        self.file_loader("pdfload", PDF_FILE, pdf_valid)
        self.buffer_loader("pdfload_buffer", PDF_FILE, pdf_valid)

        im = pyvips.Image.new_from_file(PDF_FILE)
        x = pyvips.Image.new_from_file(PDF_FILE, scale=2)
        assert abs(im.width * 2 - x.width) < 2
        assert abs(im.height * 2 - x.height) < 2

        im = pyvips.Image.new_from_file(PDF_FILE)
        x = pyvips.Image.new_from_file(PDF_FILE, dpi=144)
        assert abs(im.width * 2 - x.width) < 2
        assert abs(im.height * 2 - x.height) < 2

    @skip_if_no("gifload")
    def test_gifload(self):
        def gif_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [33])
            assert im.width == 159
            assert im.height == 203
            assert im.bands == 1

        self.file_loader("gifload", GIF_FILE, gif_valid)
        self.buffer_loader("gifload_buffer", GIF_FILE, gif_valid)

        # 'n' param added in 8.5
        if pyvips.at_least_libvips(8, 5):
            x1 = pyvips.Image.new_from_file(GIF_ANIM_FILE)
            x2 = pyvips.Image.new_from_file(GIF_ANIM_FILE, n=2)
            assert x2.height == 2 * x1.height
            page_height = x2.get("page-height")
            assert page_height == x1.height

            x2 = pyvips.Image.new_from_file(GIF_ANIM_FILE, n=-1)
            assert x2.height == 5 * x1.height
            # our test gif has delay 0 for the first frame set in error
            assert x2.get("delay") == [0, 50, 50, 50, 50]

            x2 = pyvips.Image.new_from_file(GIF_ANIM_FILE, page=1, n=-1)
            assert x2.height == 4 * x1.height

    @skip_if_no("svgload")
    def test_svgload(self):
        def svg_valid(im):
            a = im(10, 10)
            assert_almost_equal_objects(a, [0, 0, 0, 0])
            assert im.width == 736
            assert im.height == 552
            assert im.bands == 4

        self.file_loader("svgload", SVG_FILE, svg_valid)
        self.buffer_loader("svgload_buffer", SVG_FILE, svg_valid)

        self.file_loader("svgload", SVGZ_FILE, svg_valid)
        self.buffer_loader("svgload_buffer", SVGZ_FILE, svg_valid)

        self.file_loader("svgload", SVG_GZ_FILE, svg_valid)

        im = pyvips.Image.new_from_file(SVG_FILE)
        x = pyvips.Image.new_from_file(SVG_FILE, scale=2)
        assert abs(im.width * 2 - x.width) < 2
        assert abs(im.height * 2 - x.height) < 2

        im = pyvips.Image.new_from_file(SVG_FILE)
        x = pyvips.Image.new_from_file(SVG_FILE, dpi=144)
        assert abs(im.width * 2 - x.width) < 2
        assert abs(im.height * 2 - x.height) < 2

    def test_csv(self):
        self.save_load("%s.csv", self.mono)

    def test_matrix(self):
        self.save_load("%s.mat", self.mono)

    @skip_if_no("ppmload")
    def test_ppm(self):
        self.save_load("%s.ppm", self.mono)
        self.save_load("%s.ppm", self.colour)

    @skip_if_no("radload")
    def test_rad(self):
        self.save_load("%s.hdr", self.colour)
        self.save_buffer_tempfile("radsave_buffer", ".hdr",
                                  self.rad, max_diff=0)

    @skip_if_no("dzsave")
    def test_dzsave(self):
        # dzsave is hard to test, there are so many options
        # test each option separately and hope they all function together
        # correctly

        # default deepzoom layout ... we must use png here, since we want to
        # test the overlap for equality
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, suffix=".png")

        # test horizontal overlap ... expect 256 step, overlap 1
        x = pyvips.Image.new_from_file(filename + "_files/9/0_0.png")
        assert x.width == 255
        y = pyvips.Image.new_from_file(filename + "_files/9/1_0.png")
        assert y.width == 37

        # the right two columns of x should equal the left two columns of y
        left = x.crop(x.width - 2, 0, 2, x.height)
        right = y.crop(0, 0, 2, y.height)
        assert (left - right).abs().max() == 0

        # test vertical overlap
        assert x.height == 255
        y = pyvips.Image.new_from_file(filename + "_files/9/0_1.png")
        assert y.height == 189

        # the bottom two rows of x should equal the top two rows of y
        top = x.crop(0, x.height - 2, x.width, 2)
        bottom = y.crop(0, 0, y.width, 2)
        assert (top - bottom).abs().max() == 0

        # there should be a bottom layer
        x = pyvips.Image.new_from_file(filename + "_files/0/0_0.png")
        assert x.width == 1
        assert x.height == 1

        # 9 should be the final layer
        assert not os.path.isdir(filename + "_files/10")

        # default google layout
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, layout="google")

        # test bottom-right tile ... default is 256x256 tiles, overlap 0
        x = pyvips.Image.new_from_file(filename + "/1/1/1.jpg")
        assert x.width == 256
        assert x.height == 256
        assert not os.path.exists(filename + "/1/1/2.jpg")
        assert not os.path.exists(filename + "/2")
        x = pyvips.Image.new_from_file(filename + "/blank.png")
        assert x.width == 256
        assert x.height == 256

        # google layout with overlap ... verify that we clip correctly

        # overlap 1, 510x510 pixels, 256 pixel tiles, should be exactly 2x2
        # tiles, though in fact the bottom and right edges will be white
        filename = temp_filename(self.tempdir, '')
        self.colour \
            .replicate(2, 2) \
            .crop(0, 0, 510, 510) \
            .dzsave(filename, layout="google", overlap=1, depth="one")

        x = pyvips.Image.new_from_file(filename + "/0/1/1.jpg")
        assert x.width == 256
        assert x.height == 256
        assert not os.path.exists(filename + "/0/2/2.jpg")

        # with 511x511, it'll fit exactly into 2x2 -- we we actually generate
        # 3x3, since we output the overlaps
        filename = temp_filename(self.tempdir, '')
        self.colour \
            .replicate(2, 2) \
            .crop(0, 0, 511, 511) \
            .dzsave(filename, layout="google", overlap=1, depth="one")

        x = pyvips.Image.new_from_file(filename + "/0/2/2.jpg")
        assert x.width == 256
        assert x.height == 256
        assert not os.path.exists(filename + "/0/3/3.jpg")

        # default zoomify layout
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, layout="zoomify")

        # 256x256 tiles, no overlap
        assert os.path.exists(filename + "/ImageProperties.xml")
        x = pyvips.Image.new_from_file(filename + "/TileGroup0/1-0-0.jpg")
        assert x.width == 256
        assert x.height == 256

        # test zip output
        filename = temp_filename(self.tempdir, '.zip')
        self.colour.dzsave(filename)
        assert os.path.exists(filename)
        assert not os.path.exists(filename + "_files")
        assert not os.path.exists(filename + ".dzi")

        # test compressed zip output
        filename2 = temp_filename(self.tempdir, '.zip')
        self.colour.dzsave(filename2, compression=-1)
        assert os.path.exists(filename2)
        assert os.path.getsize(filename2) < os.path.getsize(filename)

        # test suffix
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, suffix=".png")

        x = pyvips.Image.new_from_file(filename + "_files/9/0_0.png")
        assert x.width == 255

        # test overlap
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, overlap=200)

        y = pyvips.Image.new_from_file(filename + "_files/9/1_1.jpeg")
        assert y.width == 236

        # test tile-size
        filename = temp_filename(self.tempdir, '')
        self.colour.dzsave(filename, tile_size=512)

        y = pyvips.Image.new_from_file(filename + "_files/9/0_0.jpeg")
        assert y.width == 290
        assert y.height == 442

        # test save to memory buffer
        filename = temp_filename(self.tempdir, '.zip')
        base = os.path.basename(filename)
        root, ext = os.path.splitext(base)

        self.colour.dzsave(filename)
        with open(filename, 'rb') as f:
            buf1 = f.read()
        buf2 = self.colour.dzsave_buffer(basename=root)
        assert len(buf1) == len(buf2)

        # we can't test the bytes are exactly equal -- the timestamps will
        # be different

        # added in 8.7
        buf = self.colour.dzsave_buffer(region_shrink="mean")
        buf = self.colour.dzsave_buffer(region_shrink="mode")
        buf = self.colour.dzsave_buffer(region_shrink="median")

    @skip_if_no("heifload")
    def test_heifload(self):
        def heif_valid(im):
            a = im(10, 10)
            # different versions of HEIC decode have slightly different 
            # rounding
            assert_almost_equal_objects(a, [75.0, 86.0, 81.0], threshold=2)
            assert im.width == 4032
            assert im.height == 3024
            assert im.bands == 3

        self.file_loader("heifload", HEIC_FILE, heif_valid)
        self.buffer_loader("heifload_buffer", HEIC_FILE, heif_valid)

    @skip_if_no("heifsave")
    def test_heifsave(self):
        self.save_load_buffer("heifsave_buffer", "heifload_buffer",
                              self.colour, 80)
        self.save_load("%s.heic", self.colour)

        # test lossless mode
        im = pyvips.Image.new_from_file(HEIC_FILE)
        buf = im.heifsave_buffer(lossless=True)
        im2 = pyvips.Image.new_from_buffer(buf, "")
        # not in fact quite lossless
        assert abs(im.avg() - im2.avg()) < 3

        # higher Q should mean a bigger buffer
        b1 = im.heifsave_buffer(Q=10)
        b2 = im.heifsave_buffer(Q=90)
        assert len(b2) > len(b1)

        # try saving an image with an ICC profile and reading it back 
        # not all libheif have profile support, so put it in an if
        buf = self.colour.heifsave_buffer()
        im = pyvips.Image.new_from_buffer(buf, "")
        p1 = self.colour.get("icc-profile-data")
        if im.get_typeof("icc-profile-data") != 0:
            p2 = im.get("icc-profile-data")
            assert p1 == p2

        # add tests for exif, xmp, ipct
        # the exif test will need us to be able to walk the header,
        # we can't just check exif-data

        # libheif 1.1 (on ubuntu 18.04, current LTS) does not support exif
        # write, so this test is commented out

        # test that exif changes change the output of heifsave
        # first make sure we have exif support
        #z = pyvips.Image.new_from_file(JPEG_FILE)
        #if z.get_typeof("exif-ifd0-Orientation") != 0:
        #    x = self.colour.copy()
        #    x.set("exif-ifd0-Make", "banana")
        #    buf = x.heifsave_buffer()
        #    y = pyvips.Image.new_from_buffer(buf, "")
        #    assert y.get("exif-ifd0-Make").split(" ")[0] == "banana"

if __name__ == '__main__':
    pytest.main()