python-cairocffi 0.5.4-1 / usr / lib / python2.7 / dist-packages / cairocffi / test_cairo.py

# coding: utf8
"""
    cairocffi.tests
    ~~~~~~~~~~~~~~~

    Test suite for cairocffi.

    :copyright: Copyright 2013 by Simon Sapin
    :license: BSD, see LICENSE for details.

"""

import io
import gc
import os
import sys
import math
import array
import base64
import shutil
import tempfile
import contextlib

import pytest

import cairocffi
from . import *
from .compat import u, pixel


@contextlib.contextmanager
def temp_directory():
    tempdir = tempfile.mkdtemp(u('é'))
    assert u('é') in tempdir  # Test non-ASCII filenames
    try:
        yield tempdir
    finally:
        shutil.rmtree(tempdir)


def round_tuple(values):
    return tuple(round(v, 6) for v in values)


def assert_raise_finished(func, *args, **kwargs):
    with pytest.raises(cairocffi.CairoError) as exc:
        func(*args, **kwargs)
    assert 'SURFACE_FINISHED' in str(exc)


def test_cairo_version():
    major, minor, micro = map(int, cairo_version_string().split('.'))
    assert cairo_version() == major * 10000 + minor * 100 + micro


def test_install_as_pycairo():
    cairocffi.install_as_pycairo()
    import cairo
    assert cairo is cairocffi


def test_image_surface():
    assert ImageSurface.format_stride_for_width(
        cairocffi.FORMAT_ARGB32, 100) == 400
    assert ImageSurface.format_stride_for_width(
        cairocffi.FORMAT_A8, 100) == 100

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 20, 30)
    assert surface.get_format() == cairocffi.FORMAT_ARGB32
    assert surface.get_width() == 20
    assert surface.get_height() == 30
    assert surface.get_stride() == 20 * 4

    with pytest.raises(ValueError):
        # buffer too small
        data = array.array('B', b'\x00' * 799)
        ImageSurface.create_for_data(data, cairocffi.FORMAT_ARGB32, 10, 20)
    data = array.array('B', b'\x00' * 800)
    surface = ImageSurface.create_for_data(data, cairocffi.FORMAT_ARGB32,
                                           10, 20, stride=40)
    context = Context(surface)
    # The default source is opaque black:
    assert context.get_source().get_rgba() == (0, 0, 0, 1)
    context.paint_with_alpha(0.5)
    assert data.tostring() == pixel(b'\x80\x00\x00\x00') * 200


def test_image_bytearray_buffer():
    if '__pypy__' in sys.modules:
        pytest.xfail()
    # Also test buffers through ctypes.c_char.from_buffer,
    # not available on PyPy
    data = bytearray(800)
    surface = ImageSurface.create_for_data(data, cairocffi.FORMAT_ARGB32,
                                           10, 20, stride=40)
    Context(surface).paint_with_alpha(0.5)
    assert data == pixel(b'\x80\x00\x00\x00') * 200


def test_surface_create_similar_image():
    if cairo_version() < 11200:
        pytest.xfail()
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 20, 30)
    similar = surface.create_similar_image(cairocffi.FORMAT_A8, 4, 100)
    assert isinstance(similar, ImageSurface)
    assert similar.get_content() == cairocffi.CONTENT_ALPHA
    assert similar.get_format() == cairocffi.FORMAT_A8
    assert similar.get_width() == 4
    assert similar.get_height() == 100


def test_surface_create_for_rectangle():
    if cairo_version() < 11000:
        pytest.xfail()
    surface = ImageSurface(cairocffi.FORMAT_A8, 4, 4)
    data = surface.get_data()
    assert data[:] == b'\x00' * 16
    Context(surface.create_for_rectangle(1, 1, 2, 2)).paint()
    assert data[:] == (
        b'\x00\x00\x00\x00'
        b'\x00\xFF\xFF\x00'
        b'\x00\xFF\xFF\x00'
        b'\x00\x00\x00\x00')


def test_surface():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 20, 30)
    similar = surface.create_similar(cairocffi.CONTENT_ALPHA, 4, 100)
    assert isinstance(similar, ImageSurface)
    assert similar.get_content() == cairocffi.CONTENT_ALPHA
    assert similar.get_format() == cairocffi.FORMAT_A8
    assert similar.get_width() == 4
    assert similar.get_height() == 100
    assert similar.has_show_text_glyphs() is False
    assert PDFSurface(None, 1, 1).has_show_text_glyphs() is True
    surface.copy_page()
    surface.show_page()
    surface.mark_dirty()
    surface.mark_dirty_rectangle(1, 2, 300, 12000)
    surface.flush()

    surface.set_device_offset(14, 3)
    assert surface.get_device_offset() == (14, 3)

    surface.set_fallback_resolution(15, 6)
    assert surface.get_fallback_resolution() == (15, 6)

    context = Context(surface)
    assert isinstance(context.get_target(), ImageSurface)
    surface_map = cairocffi.surfaces.SURFACE_TYPE_TO_CLASS
    try:
        del surface_map[cairocffi.SURFACE_TYPE_IMAGE]
        target = context.get_target()
        assert target._pointer == surface._pointer
        assert isinstance(target, Surface)
        assert not isinstance(target, ImageSurface)
    finally:
        surface_map[cairocffi.SURFACE_TYPE_IMAGE] = ImageSurface

    surface.finish()
    assert_raise_finished(surface.copy_page)
    assert_raise_finished(surface.show_page)
    assert_raise_finished(surface.set_device_offset, 1, 2)
    assert_raise_finished(surface.set_fallback_resolution, 3, 4)


def test_target_lifetime():
    # Test our work around for
    # Related CFFI bug: https://bitbucket.org/cffi/cffi/issue/92/
    if not hasattr(sys, 'getrefcount'):
        pytest.xfail()  # PyPy
    gc.collect()  # Clean up stuff from other tests
    target = io.BytesIO()
    initial_refcount = sys.getrefcount(target)
    assert len(cairocffi.surfaces.KeepAlive.instances) == 0
    surface = PDFSurface(target, 100, 100)
    # The target is in a KeepAlive object
    assert len(cairocffi.surfaces.KeepAlive.instances) == 1
    assert sys.getrefcount(target) == initial_refcount + 1
    del surface
    gc.collect()  # Make sure surface is collected
    assert len(cairocffi.surfaces.KeepAlive.instances) == 0
    assert sys.getrefcount(target) == initial_refcount


def test_mime_data():
    if cairo_version() < 11000:
        pytest.xfail()
    surface = PDFSurface(None, 1, 1)
    assert surface.get_mime_data('image/jpeg') is None
    gc.collect()  # Clean up KeepAlive stuff from other tests
    assert len(cairocffi.surfaces.KeepAlive.instances) == 0
    surface.set_mime_data('image/jpeg', b'lol')
    assert len(cairocffi.surfaces.KeepAlive.instances) == 1
    assert surface.get_mime_data('image/jpeg')[:] == b'lol'

    surface.set_mime_data('image/jpeg', None)
    assert len(cairocffi.surfaces.KeepAlive.instances) == 0
    if cairo_version() >= 11200:
        # This actually segfauts on cairo 1.10.x
        assert surface.get_mime_data('image/jpeg') is None
    surface.finish()
    assert_raise_finished(surface.set_mime_data, 'image/jpeg', None)


def test_supports_mime_type():
    if cairo_version() < 11200:
        pytest.xfail()
    # Also test we get actual booleans:
    assert PDFSurface(None, 1, 1).supports_mime_type('image/jpeg') is True
    surface = ImageSurface(cairocffi.FORMAT_A8, 1, 1)
    assert surface.supports_mime_type('image/jpeg') is False


def test_png():
    png_bytes = base64.b64decode(
        b'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQI12O'
        b'w69x7BgAE3gJRgNit0AAAAABJRU5ErkJggg==')
    png_magic_number = png_bytes[:8]

    with temp_directory() as tempdir:
        filename = os.path.join(tempdir, 'foo.png')
        filename_bytes = filename.encode(sys.getfilesystemencoding())

        surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
        surface.write_to_png(filename)
        with open(filename, 'rb') as fd:
            written_png_bytes = fd.read()
            assert written_png_bytes.startswith(png_magic_number)
        open(filename, 'wb').close()
        with open(filename, 'rb') as fd:
            assert fd.read() == b''
        surface.write_to_png(filename_bytes)
        with open(filename, 'rb') as fd:
            assert fd.read() == written_png_bytes
        file_obj = io.BytesIO()
        surface.write_to_png(file_obj)
        assert file_obj.getvalue() == written_png_bytes
        assert surface.write_to_png() == written_png_bytes

        with open(filename, 'wb') as fd:
            fd.write(png_bytes)
        for source in [io.BytesIO(png_bytes), filename, filename_bytes]:
            surface = ImageSurface.create_from_png(source)
            assert surface.get_format() == cairocffi.FORMAT_ARGB32
            assert surface.get_width() == 1
            assert surface.get_height() == 1
            assert surface.get_stride() == 4
            assert surface.get_data()[:] == pixel(b'\xcc\x32\x6e\x97')

    with pytest.raises(IOError):
        # Truncated input
        surface = ImageSurface.create_from_png(io.BytesIO(png_bytes[:30]))
    with pytest.raises(IOError):
        surface = ImageSurface.create_from_png(io.BytesIO(b''))


def test_pdf_versions():
    if cairo_version() < 11000:
        pytest.xfail()
    assert set(PDFSurface.get_versions()) >= set([
        cairocffi.PDF_VERSION_1_4, cairocffi.PDF_VERSION_1_5])
    assert PDFSurface.version_to_string(cairocffi.PDF_VERSION_1_4) == 'PDF 1.4'
    with pytest.raises(TypeError):
        PDFSurface.version_to_string('PDF_VERSION_42')
    with pytest.raises(ValueError):
        PDFSurface.version_to_string(42)

    file_obj = io.BytesIO()
    PDFSurface(file_obj, 1, 1).finish()
    assert file_obj.getvalue().startswith(b'%PDF-1.5')

    file_obj = io.BytesIO()
    surface = PDFSurface(file_obj, 1, 1)
    surface.restrict_to_version(cairocffi.PDF_VERSION_1_4)
    surface.finish()
    assert file_obj.getvalue().startswith(b'%PDF-1.4')


def test_pdf_surface():
    with temp_directory() as tempdir:
        filename = os.path.join(tempdir, 'foo.pdf')
        filename_bytes = filename.encode(sys.getfilesystemencoding())
        file_obj = io.BytesIO()
        for target in [filename, filename_bytes, file_obj, None]:
            surface = PDFSurface(target, 123, 432)
            surface.finish()
        with open(filename, 'rb') as fd:
            assert fd.read().startswith(b'%PDF')
        with open(filename_bytes, 'rb') as fd:
            assert fd.read().startswith(b'%PDF')
        pdf_bytes = file_obj.getvalue()
        assert pdf_bytes.startswith(b'%PDF')
        assert b'/MediaBox [ 0 0 123 432 ]' in pdf_bytes
        assert pdf_bytes.count(b'/Type /Page\n') == 1

    file_obj = io.BytesIO()
    surface = PDFSurface(file_obj, 1, 1)
    context = Context(surface)
    surface.set_size(12, 100)
    context.show_page()
    surface.set_size(42, 700)
    context.copy_page()
    surface.finish()
    pdf_bytes = file_obj.getvalue()
    assert b'/MediaBox [ 0 0 1 1 ]' not in pdf_bytes
    assert b'/MediaBox [ 0 0 12 100 ]' in pdf_bytes
    assert b'/MediaBox [ 0 0 42 700 ]' in pdf_bytes
    assert pdf_bytes.count(b'/Type /Page\n') == 2


def test_svg_surface():
    assert set(SVGSurface.get_versions()) >= set([
        cairocffi.SVG_VERSION_1_1, cairocffi.SVG_VERSION_1_2])
    assert SVGSurface.version_to_string(cairocffi.SVG_VERSION_1_1) == 'SVG 1.1'
    with pytest.raises(TypeError):
        SVGSurface.version_to_string('SVG_VERSION_42')
    with pytest.raises(ValueError):
        SVGSurface.version_to_string(42)

    with temp_directory() as tempdir:
        filename = os.path.join(tempdir, 'foo.svg')
        filename_bytes = filename.encode(sys.getfilesystemencoding())
        file_obj = io.BytesIO()
        for target in [filename, filename_bytes, file_obj, None]:
            SVGSurface(target, 123, 432).finish()
        with open(filename, 'rb') as fd:
            assert fd.read().startswith(b'<?xml')
        with open(filename_bytes, 'rb') as fd:
            assert fd.read().startswith(b'<?xml')
        svg_bytes = file_obj.getvalue()
        assert svg_bytes.startswith(b'<?xml')
        assert b'viewBox="0 0 123 432"' in svg_bytes

    surface = SVGSurface(None, 1, 1)
    # Not obvious to test
    surface.restrict_to_version(cairocffi.SVG_VERSION_1_1)


def test_ps_surface():
    assert set(PSSurface.get_levels()) >= set([
        cairocffi.PS_LEVEL_2, cairocffi.PS_LEVEL_3])
    assert PSSurface.ps_level_to_string(cairocffi.PS_LEVEL_3) == 'PS Level 3'
    with pytest.raises(TypeError):
        PSSurface.ps_level_to_string('PS_LEVEL_42')
    with pytest.raises(ValueError):
        PSSurface.ps_level_to_string(42)

    with temp_directory() as tempdir:
        filename = os.path.join(tempdir, 'foo.ps')
        filename_bytes = filename.encode(sys.getfilesystemencoding())
        file_obj = io.BytesIO()
        for target in [filename, filename_bytes, file_obj, None]:
            PSSurface(target, 123, 432).finish()
        with open(filename, 'rb') as fd:
            assert fd.read().startswith(b'%!PS')
        with open(filename_bytes, 'rb') as fd:
            assert fd.read().startswith(b'%!PS')
        assert file_obj.getvalue().startswith(b'%!PS')

    file_obj = io.BytesIO()
    surface = PSSurface(file_obj, 1, 1)
    surface.restrict_to_level(cairocffi.PS_LEVEL_2)  # Not obvious to test
    assert surface.get_eps() is False
    surface.set_eps('lol')
    assert surface.get_eps() is True
    surface.set_eps('')
    assert surface.get_eps() is False
    surface.set_size(10, 12)
    surface.dsc_comment(u('%%Lorem'))
    surface.dsc_begin_setup()
    surface.dsc_comment('%%ipsum')
    surface.dsc_begin_page_setup()
    surface.dsc_comment('%%dolor')
    surface.finish()
    ps_bytes = file_obj.getvalue()
    assert b'%%Lorem' in ps_bytes
    assert b'%%ipsum' in ps_bytes
    assert b'%%dolor' in ps_bytes


def _recording_surface_common(extents):
    if cairo_version() < 11000:
        pytest.xfail()
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 100)
    empty_pixels = surface.get_data()[:]
    assert empty_pixels == b'\x00' * 40000

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 100)
    context = Context(surface)
    context.move_to(20, 50)
    context.show_text('Something about us.')
    text_pixels = surface.get_data()[:]
    assert text_pixels != empty_pixels

    recording_surface = RecordingSurface(cairocffi.CONTENT_COLOR_ALPHA,
                                         extents)
    context = Context(recording_surface)
    context.move_to(20, 50)
    assert recording_surface.ink_extents() == (0, 0, 0, 0)
    context.show_text('Something about us.')
    recording_surface.flush()
    assert recording_surface.ink_extents() != (0, 0, 0, 0)

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 100)
    context = Context(surface)
    context.set_source_surface(recording_surface)
    context.paint()
    recorded_pixels = surface.get_data()[:]
    return text_pixels, recorded_pixels


def test_recording_surface():
    text_pixels, recorded_pixels = _recording_surface_common((0, 0, 140, 80))
    assert recorded_pixels == text_pixels


def test_unbounded_recording_surface():
    if cairo_version() < 11200:
        # Unbounded recording surfaces do not seem to record anything on 1.10.
        pytest.xfail()
    text_pixels, recorded_pixels = _recording_surface_common(None)
    assert recorded_pixels == text_pixels


def test_recording_surface_get_extents():
    if cairo_version() < 11200:
        pytest.xfail()
    for extents in [None, (0, 0, 140, 80)]:
        surface = RecordingSurface(cairocffi.CONTENT_COLOR_ALPHA, extents)
        assert surface.get_extents() == extents


def test_matrix():
    m = Matrix()
    with pytest.raises(AttributeError):
        m.some_inexistent_attribute
    assert m.as_tuple() == (1, 0,  0, 1,  0, 0)
    m.translate(12, 4)
    assert m.as_tuple() == (1, 0,  0, 1,  12, 4)
    m.scale(2, 7)
    assert m.as_tuple() == (2, 0,  0, 7,  12, 4)
    assert m[3] == 7
    assert m.yy == 7
    m.yy = 3
    assert m.as_tuple() == (2, 0,  0, 3,  12, 4)
    assert repr(m) == 'Matrix(2, 0, 0, 3, 12, 4)'
    assert str(m) == 'Matrix(2, 0, 0, 3, 12, 4)'

    assert m.transform_distance(1, 2) == (2, 6)
    assert m.transform_point(1, 2) == (14, 10)

    m2 = m.copy()
    assert m2 == m
    m2.invert()
    assert m2.as_tuple() == (0.5, 0,  0, 1./3,  -12 / 2, -4. / 3)
    assert m.inverted() == m2
    assert m.as_tuple() == (2, 0,  0, 3,  12, 4)  # Unchanged

    m2 = Matrix(*m)
    assert m2 == m
    m2.invert()
    assert m2.as_tuple() == (0.5, 0,  0, 1./3,  -12 / 2, -4. / 3)
    assert m.inverted() == m2
    assert m.as_tuple() == (2, 0,  0, 3,  12, 4)  # Still unchanged

    m.rotate(math.pi / 2)
    assert round_tuple(m.as_tuple()) == (0, 3,  -2, 0,  12, 4)
    m *= Matrix.init_rotate(math.pi)
    assert round_tuple(m.as_tuple()) == (0, -3,  2, 0,  -12, -4)


def test_surface_pattern():
    surface = ImageSurface(cairocffi.FORMAT_A1, 1, 1)
    pattern = SurfacePattern(surface)

    surface_again = pattern.get_surface()
    assert surface_again is not surface
    assert surface_again._pointer == surface._pointer

    assert pattern.get_extend() == cairocffi.EXTEND_NONE
    pattern.set_extend(cairocffi.EXTEND_REPEAT)
    assert pattern.get_extend() == cairocffi.EXTEND_REPEAT

    assert pattern.get_filter() == cairocffi.FILTER_GOOD
    pattern.set_filter(cairocffi.FILTER_BEST)
    assert pattern.get_filter() == cairocffi.FILTER_BEST

    assert pattern.get_matrix() == Matrix()  # identity
    matrix = Matrix.init_rotate(0.5)
    pattern.set_matrix(matrix)
    assert pattern.get_matrix() == matrix
    assert pattern.get_matrix() != Matrix()


def test_solid_pattern():
    assert SolidPattern(1, .5, .25).get_rgba() == (1, .5, .25, 1)
    assert SolidPattern(1, .5, .25, .75).get_rgba() == (1, .5, .25, .75)

    surface = PDFSurface(None, 1, 1)
    context = Context(surface)
    pattern = SolidPattern(1, .5, .25)
    context.set_source(pattern)
    assert isinstance(context.get_source(), SolidPattern)
    pattern_map = cairocffi.patterns.PATTERN_TYPE_TO_CLASS
    try:
        del pattern_map[cairocffi.PATTERN_TYPE_SOLID]
        re_pattern = context.get_source()
        assert re_pattern._pointer == pattern._pointer
        assert isinstance(re_pattern, Pattern)
        assert not isinstance(re_pattern, SolidPattern)
    finally:
        pattern_map[cairocffi.PATTERN_TYPE_SOLID] = SolidPattern


def pdf_with_pattern(pattern=None):
    file_obj = io.BytesIO()
    surface = PDFSurface(file_obj, 100, 100)
    context = Context(surface)
    if pattern is not None:
        context.set_source(pattern)
    context.paint()
    surface.finish()
    return file_obj.getvalue()


def test_linear_gradient():
    gradient = LinearGradient(1, 2, 10, 20)
    assert gradient.get_linear_points() == (1, 2, 10, 20)
    gradient.add_color_stop_rgb(1, 1, .5, .25)
    gradient.add_color_stop_rgb(offset=.5, red=1, green=.5, blue=.25)
    gradient.add_color_stop_rgba(.5, 1, .5, .75, .25)
    assert gradient.get_color_stops() == [
        (.5, 1, .5, .25, 1),
        (.5, 1, .5, .75, .25),
        (1, 1, .5, .25, 1)]

    # Values chosen so that we can test get_data() bellow with an exact
    # byte string that (hopefully) does not depend on rounding behavior:
    # 255 / 5. == 51.0 == 0x33
    surface = ImageSurface(cairocffi.FORMAT_A8, 8, 4)
    assert surface.get_data()[:] == b'\x00' * 32
    gradient = LinearGradient(1.5, 0, 6.5, 0)
    gradient.add_color_stop_rgba(0, 0, 0, 0, 0)
    gradient.add_color_stop_rgba(1, 0, 0, 0, 1)
    context = Context(surface)
    context.set_source(gradient)
    context.paint()
    assert surface.get_data()[:] == b'\x00\x00\x33\x66\x99\xCC\xFF\xFF' * 4

    assert b'/ShadingType 2' not in pdf_with_pattern()
    assert b'/ShadingType 2' in pdf_with_pattern(gradient)


def test_radial_gradient():
    gradient = RadialGradient(42, 420, 10, 43, 430, 100)
    assert gradient.get_radial_circles() == (42, 420, 10, 43, 430, 100)
    gradient.add_color_stop_rgb(1, 1, .5, .25)
    gradient.add_color_stop_rgb(offset=.5, red=1, green=.5, blue=.25)
    gradient.add_color_stop_rgba(.5, 1, .5, .75, .25)
    assert gradient.get_color_stops() == [
        (.5, 1, .5, .25, 1),
        (.5, 1, .5, .75, .25),
        (1, 1, .5, .25, 1)]

    assert b'/ShadingType 3' not in pdf_with_pattern()
    assert b'/ShadingType 3' in pdf_with_pattern(gradient)


def test_context_as_context_manager():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
    context = Context(surface)
    # The default source is opaque black:
    assert context.get_source().get_rgba() == (0, 0, 0, 1)
    with context:
        context.set_source_rgb(1, .25, .5)
        assert context.get_source().get_rgba() == (1, .25, .5, 1)
    # Context restored at the end of with statement.
    assert context.get_source().get_rgba() == (0, 0, 0, 1)
    try:
        with context:
            context.set_source_rgba(1, .25, .75, .5)
            assert context.get_source().get_rgba() == (1, .25, .75, .5)
            raise ValueError
    except ValueError:
        pass
    # Context also restored on exceptions.
    assert context.get_source().get_rgba() == (0, 0, 0, 1)


def test_context_groups():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
    context = Context(surface)
    assert isinstance(context.get_target(), ImageSurface)
    assert context.get_target()._pointer == surface._pointer
    assert context.get_group_target()._pointer == surface._pointer
    assert (context.get_group_target().get_content() ==
            cairocffi.CONTENT_COLOR_ALPHA)
    assert surface.get_data()[:] == pixel(b'\x00\x00\x00\x00')

    with context:
        context.push_group_with_content(cairocffi.CONTENT_ALPHA)
        assert (context.get_group_target().get_content() ==
                cairocffi.CONTENT_ALPHA)
        context.set_source_rgba(1, .2, .4, .8)  # Only A is actually used
        assert isinstance(context.get_source(), SolidPattern)
        context.paint()
        context.pop_group_to_source()
        assert isinstance(context.get_source(), SurfacePattern)
        # Still nothing on the original surface
        assert surface.get_data()[:] == pixel(b'\x00\x00\x00\x00')
        context.paint()
        assert surface.get_data()[:] == pixel(b'\xCC\x00\x00\x00')

    with context:
        context.push_group()
        context.set_source_rgba(1, .2, .4)
        context.paint()
        group = context.pop_group()
        assert isinstance(context.get_source(), SolidPattern)
        assert isinstance(group, SurfacePattern)
        context.set_source_surface(group.get_surface())
        assert surface.get_data()[:] == pixel(b'\xCC\x00\x00\x00')
        context.paint()
        assert surface.get_data()[:] == pixel(b'\xFF\xFF\x33\x66')


def test_context_current_transform_matrix():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
    context = Context(surface)
    assert isinstance(context.get_matrix(), Matrix)
    assert context.get_matrix().as_tuple() == (1, 0, 0, 1, 0, 0)
    context.translate(6, 5)
    assert context.get_matrix().as_tuple() == (1, 0, 0, 1, 6, 5)
    context.scale(1, 6)
    assert context.get_matrix().as_tuple() == (1, 0, 0, 6, 6, 5)
    context.scale(.5)
    assert context.get_matrix().as_tuple() == (.5, 0, 0, 3, 6, 5)
    context.rotate(math.pi / 2)
    assert round_tuple(context.get_matrix().as_tuple()) == (0, 3, -.5, 0, 6, 5)

    context.identity_matrix()
    assert context.get_matrix().as_tuple() == (1, 0, 0, 1, 0, 0)
    context.set_matrix(Matrix(2, 1, 3, 7, 8, 2))
    assert context.get_matrix().as_tuple() == (2, 1, 3, 7, 8, 2)
    context.transform(Matrix(2, 0, 0, .5, 0, 0))
    assert context.get_matrix().as_tuple() == (4, 2, 1.5, 3.5, 8, 2)

    context.set_matrix(Matrix(2, 0,  0, 3,  12, 4))
    assert context.user_to_device_distance(1, 2) == (2, 6)
    assert context.user_to_device(1, 2) == (14, 10)
    assert context.device_to_user_distance(2, 6) == (1, 2)
    assert round_tuple(context.device_to_user(14, 10)) == (1, 2)


def test_context_path():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
    context = Context(surface)

    assert context.copy_path() == []
    assert context.has_current_point() is False
    assert context.get_current_point() == (0, 0)
    context.arc(100, 200, 20, math.pi/2, 0)
    path_1 = context.copy_path()
    assert path_1[0] == (cairocffi.PATH_MOVE_TO, (100, 220))
    assert len(path_1) > 1
    assert all(part[0] == cairocffi.PATH_CURVE_TO for part in path_1[1:])
    assert context.has_current_point() is True
    assert context.get_current_point() == (120, 200)

    context.new_sub_path()
    assert context.copy_path() == path_1
    assert context.has_current_point() is False
    assert context.get_current_point() == (0, 0)
    context.new_path()
    assert context.copy_path() == []
    assert context.has_current_point() is False
    assert context.get_current_point() == (0, 0)

    context.arc_negative(100, 200, 20, math.pi/2, 0)
    path_2 = context.copy_path()
    assert path_2[0] == (cairocffi.PATH_MOVE_TO, (100, 220))
    assert len(path_2) > 1
    assert all(part[0] == cairocffi.PATH_CURVE_TO for part in path_2[1:])
    assert path_2 != path_1

    context.new_path()
    context.rectangle(10, 20, 100, 200)
    path = context.copy_path()
    # Some cairo versions add a MOVE_TO after a CLOSE_PATH
    if path[-1] == (cairocffi.PATH_MOVE_TO, (10, 20)):  # pragma: no cover
        path = path[:-1]
    assert path == [
        (cairocffi.PATH_MOVE_TO, (10, 20)),
        (cairocffi.PATH_LINE_TO, (110, 20)),
        (cairocffi.PATH_LINE_TO, (110, 220)),
        (cairocffi.PATH_LINE_TO, (10, 220)),
        (cairocffi.PATH_CLOSE_PATH, ())]
    assert context.path_extents() == (10, 20, 110, 220)

    context.new_path()
    context.move_to(10, 20)
    context.line_to(10, 30)
    context.rel_move_to(2, 5)
    context.rel_line_to(2, 5)
    context.curve_to(20, 30, 70, 50, 100, 120)
    context.rel_curve_to(20, 30, 70, 50, 100, 120)
    context.close_path()
    path = context.copy_path()
    if path[-1] == (cairocffi.PATH_MOVE_TO, (12, 35)):  # pragma: no cover
        path = path[:-1]
    assert path == [
        (cairocffi.PATH_MOVE_TO, (10, 20)),
        (cairocffi.PATH_LINE_TO, (10, 30)),
        (cairocffi.PATH_MOVE_TO, (12, 35)),
        (cairocffi.PATH_LINE_TO, (14, 40)),
        (cairocffi.PATH_CURVE_TO, (20, 30, 70, 50, 100, 120)),
        (cairocffi.PATH_CURVE_TO, (120, 150, 170, 170, 200, 240)),
        (cairocffi.PATH_CLOSE_PATH, ())]

    context.new_path()
    context.move_to(10, 15)
    context.curve_to(20, 30, 70, 50, 100, 120)
    assert context.copy_path() == [
        (cairocffi.PATH_MOVE_TO, (10, 15)),
        (cairocffi.PATH_CURVE_TO, (20, 30, 70, 50, 100, 120))]
    path = context.copy_path_flat()
    assert len(path) > 2
    assert path[0] == (cairocffi.PATH_MOVE_TO, (10, 15))
    assert all(part[0] == cairocffi.PATH_LINE_TO for part in path[1:])
    assert path[-1] == (cairocffi.PATH_LINE_TO, (100, 120))

    context.new_path()
    context.move_to(10, 20)
    context.line_to(10, 30)
    path = context.copy_path()
    assert path == [
        (cairocffi.PATH_MOVE_TO, (10, 20)),
        (cairocffi.PATH_LINE_TO, (10, 30))]
    additional_path = [(cairocffi.PATH_LINE_TO, (30, 150))]
    context.append_path(additional_path)
    assert context.copy_path() == path + additional_path
    # Incorrect number of points:
    with pytest.raises(ValueError):
        context.append_path([(cairocffi.PATH_LINE_TO, (30, 150, 1))])
    with pytest.raises(ValueError):
        context.append_path([(cairocffi.PATH_LINE_TO, (30, 150, 1, 4))])


def test_context_properties():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 1, 1)
    context = Context(surface)

    assert context.get_antialias() == cairocffi.ANTIALIAS_DEFAULT
    context.set_antialias(cairocffi.ANTIALIAS_BEST)
    assert context.get_antialias() == cairocffi.ANTIALIAS_BEST

    assert context.get_dash() == ([], 0)
    context.set_dash([4, 1, 3, 2], 1.5)
    assert context.get_dash() == ([4, 1, 3, 2], 1.5)
    assert context.get_dash_count() == 4

    assert context.get_fill_rule() == cairocffi.FILL_RULE_WINDING
    context.set_fill_rule(cairocffi.FILL_RULE_EVEN_ODD)
    assert context.get_fill_rule() == cairocffi.FILL_RULE_EVEN_ODD

    assert context.get_line_cap() == cairocffi.LINE_CAP_BUTT
    context.set_line_cap(cairocffi.LINE_CAP_SQUARE)
    assert context.get_line_cap() == cairocffi.LINE_CAP_SQUARE

    assert context.get_line_join() == cairocffi.LINE_JOIN_MITER
    context.set_line_join(cairocffi.LINE_JOIN_ROUND)
    assert context.get_line_join() == cairocffi.LINE_JOIN_ROUND

    assert context.get_line_width() == 2
    context.set_line_width(13)
    assert context.get_line_width() == 13

    assert context.get_miter_limit() == 10
    context.set_miter_limit(4)
    assert context.get_miter_limit() == 4

    assert context.get_operator() == cairocffi.OPERATOR_OVER
    context.set_operator(cairocffi.OPERATOR_XOR)
    assert context.get_operator() == cairocffi.OPERATOR_XOR

    assert context.get_tolerance() == 0.1
    context.set_tolerance(0.25)
    assert context.get_tolerance() == 0.25


def test_context_fill():
    surface = ImageSurface(cairocffi.FORMAT_A8, 4, 4)
    assert surface.get_data()[:] == b'\x00' * 16
    context = Context(surface)
    context.set_source_rgba(0, 0, 0, .5)
    context.set_line_width(.5)
    context.rectangle(1, 1, 2, 2)
    assert context.fill_extents() == (1, 1, 3, 3)
    assert context.stroke_extents() == (.75, .75, 3.25, 3.25)
    assert context.in_fill(2, 2) is True
    assert context.in_fill(.8, 2) is False
    assert context.in_stroke(2, 2) is False
    assert context.in_stroke(.8, 2) is True
    path = list(context.copy_path())
    assert path
    context.fill_preserve()
    assert list(context.copy_path()) == path
    assert surface.get_data()[:] == (
        b'\x00\x00\x00\x00'
        b'\x00\x80\x80\x00'
        b'\x00\x80\x80\x00'
        b'\x00\x00\x00\x00'
    )
    context.fill()
    assert list(context.copy_path()) == []
    assert surface.get_data()[:] == (
        b'\x00\x00\x00\x00'
        b'\x00\xC0\xC0\x00'
        b'\x00\xC0\xC0\x00'
        b'\x00\x00\x00\x00'
    )


def test_context_stroke():
    for preserve in [True, False]:
        surface = ImageSurface(cairocffi.FORMAT_A8, 4, 4)
        assert surface.get_data()[:] == b'\x00' * 16
        context = Context(surface)
        context.set_source_rgba(0, 0, 0, 1)
        context.set_line_width(1)
        context.rectangle(.5, .5, 2, 2)
        path = list(context.copy_path())
        assert path
        context.stroke_preserve() if preserve else context.stroke()
        assert list(context.copy_path()) == (path if preserve else [])
        assert surface.get_data()[:] == (
            b'\xFF\xFF\xFF\x00'
            b'\xFF\x00\xFF\x00'
            b'\xFF\xFF\xFF\x00'
            b'\x00\x00\x00\x00')


def test_context_clip():
    surface = ImageSurface(cairocffi.FORMAT_A8, 4, 4)
    assert surface.get_data()[:] == b'\x00' * 16
    context = Context(surface)
    context.rectangle(1, 1, 2, 2)
    assert context.clip_extents() == (0, 0, 4, 4)
    path = list(context.copy_path())
    assert path
    context.clip_preserve()
    assert list(context.copy_path()) == path
    assert context.clip_extents() == (1, 1, 3, 3)
    context.clip()
    assert list(context.copy_path()) == []
    assert context.clip_extents() == (1, 1, 3, 3)
    context.reset_clip()
    assert context.clip_extents() == (0, 0, 4, 4)

    context.rectangle(1, 1, 2, 2)
    context.rectangle(1, 2, 1, 2)
    context.clip()
    assert context.copy_clip_rectangle_list() == [(1, 1, 2, 2), (1, 3, 1, 1)]
    assert context.clip_extents() == (1, 1, 3, 4)


def test_context_in_clip():
    if cairo_version() < 11000:
        pytest.xfail()
    surface = ImageSurface(cairocffi.FORMAT_A8, 4, 4)
    context = Context(surface)
    context.rectangle(1, 1, 2, 2)
    assert context.in_clip(.5, 2) is True
    assert context.in_clip(1.5, 2) is True
    context.clip()
    assert context.in_clip(.5, 2) is False
    assert context.in_clip(1.5, 2) is True


def test_context_mask():
    mask_surface = ImageSurface(cairocffi.FORMAT_ARGB32, 2, 2)
    context = Context(mask_surface)
    context.set_source_rgba(1, 0, .5, 1)
    context.rectangle(0, 0, 1, 1)
    context.fill()
    context.set_source_rgba(1, .5, 1, .5)
    context.rectangle(1, 1, 1, 1)
    context.fill()

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 4, 4)
    context = Context(surface)
    context.mask(SurfacePattern(mask_surface))
    o = pixel(b'\x00\x00\x00\x00')
    b = pixel(b'\x80\x00\x00\x00')
    B = pixel(b'\xFF\x00\x00\x00')
    assert surface.get_data()[:] == (
        B + o + o + o +
        o + b + o + o +
        o + o + o + o +
        o + o + o + o
    )

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 4, 4)
    context = Context(surface)
    context.mask_surface(mask_surface, surface_x=1, surface_y=2)
    o = pixel(b'\x00\x00\x00\x00')
    b = pixel(b'\x80\x00\x00\x00')
    B = pixel(b'\xFF\x00\x00\x00')
    assert surface.get_data()[:] == (
        o + o + o + o +
        o + o + o + o +
        o + B + o + o +
        o + o + b + o
    )


def test_context_font():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 10, 10)
    context = Context._from_pointer(Context(surface)._pointer, incref=True)
    assert context.get_font_matrix().as_tuple() == (10, 0, 0, 10, 0, 0)
    context.set_font_matrix(Matrix(2, 0,  0, 3,  12, 4))
    assert context.get_font_matrix().as_tuple() == (2, 0,  0, 3,  12, 4)
    context.set_font_size(14)
    assert context.get_font_matrix().as_tuple() == (14, 0, 0, 14, 0, 0)

    context.set_font_size(10)
    context.select_font_face(b'serif', cairocffi.FONT_SLANT_ITALIC)
    font_face = context.get_font_face()
    assert isinstance(font_face, ToyFontFace)
    assert font_face.get_family() == 'serif'
    assert font_face.get_slant() == cairocffi.FONT_SLANT_ITALIC
    assert font_face.get_weight() == cairocffi.FONT_WEIGHT_NORMAL

    try:
        del cairocffi.fonts.FONT_TYPE_TO_CLASS[cairocffi.FONT_TYPE_TOY]
        re_font_face = context.get_font_face()
        assert re_font_face._pointer == font_face._pointer
        assert isinstance(re_font_face, FontFace)
        assert not isinstance(re_font_face, ToyFontFace)
    finally:
        cairocffi.fonts.FONT_TYPE_TO_CLASS[cairocffi.FONT_TYPE_TOY] = \
            ToyFontFace

    ascent, descent, height, max_x_advance, max_y_advance = (
        context.font_extents())
    # That’s about all we can assume for a default font.
    #assert height > ascent + descent  # Not even this is true on all fonts
    assert max_x_advance > 0
    assert max_y_advance == 0
    _, _, _, _, x_advance, y_advance = context.text_extents('i' * 10)
    assert x_advance > 0
    assert y_advance == 0
    context.set_font_face(ToyFontFace(u('monospace'),
                          weight=cairocffi.FONT_WEIGHT_BOLD))
    _, _, _, _, x_advance_mono, y_advance = context.text_extents('i' * 10)
    assert x_advance_mono > x_advance
    assert y_advance == 0
    assert list(context.copy_path()) == []
    context.text_path('a')
    assert list(context.copy_path())
    assert surface.get_data()[:] == b'\x00' * 400
    context.move_to(1, 9)
    context.show_text('a')
    assert surface.get_data()[:] != b'\x00' * 400

    assert (context.get_font_options().get_hint_metrics() ==
            cairocffi.HINT_METRICS_DEFAULT)
    context.set_font_options(
        FontOptions(hint_metrics=cairocffi.HINT_METRICS_ON))
    assert (context.get_font_options().get_hint_metrics() ==
            cairocffi.HINT_METRICS_ON)
    assert (surface.get_font_options().get_hint_metrics() ==
            cairocffi.HINT_METRICS_ON)

    context.set_font_matrix(Matrix(2, 0,  0, 3,  12, 4))
    assert context.get_scaled_font().get_font_matrix().as_tuple() == (
        2, 0,  0, 3,  12, 4)
    context.set_scaled_font(ScaledFont(ToyFontFace(), font_matrix=Matrix(
        0, 1,  4, 0,  12, 4)))
    assert context.get_font_matrix().as_tuple() == (0, 1,  4, 0,  12, 4)

    # Reset the default
    context.set_font_face(None)
    # TODO: test this somehow.


def test_scaled_font():
    font = ScaledFont(ToyFontFace())
    font_extents = font.extents()
    ascent, descent, height, max_x_advance, max_y_advance = font_extents
#    assert height > ascent + descent  # Not even this is true on all fonts
    assert max_x_advance > 0
    assert max_y_advance == 0
    _, _, _, _, x_advance, y_advance = font.text_extents('i' * 10)
    assert x_advance > 0
    assert y_advance == 0

    font = ScaledFont(ToyFontFace('monospace'))
    _, _, _, _, x_advance_mono, y_advance = font.text_extents('i' * 10)
    assert x_advance_mono > x_advance
    assert y_advance == 0
    # Not much we can test:
    # The toy font face was "materialized" into a specific backend.
    assert isinstance(font.get_font_face(), FontFace)

    font = ScaledFont(
        ToyFontFace('monospace'), Matrix(xx=20, yy=20), Matrix(xx=3, yy=.5),
        FontOptions(antialias=cairocffi.ANTIALIAS_BEST))
    assert font.get_font_options().get_antialias() == cairocffi.ANTIALIAS_BEST
    assert font.get_font_matrix().as_tuple() == (20, 0, 0, 20, 0, 0)
    assert font.get_ctm().as_tuple() == (3, 0, 0, .5, 0, 0)
    assert font.get_scale_matrix().as_tuple() == (60, 0, 0, 10, 0, 0)
    _, _, _, _, x_advance_mono_2, y_advance_2 = font.text_extents('i' * 10)
    # Same yy as before:
    assert y_advance == y_advance_2
    # Bigger xx:
    assert x_advance_mono_2 > x_advance_mono


def test_font_options():
    options = FontOptions()

    assert options.get_antialias() == cairocffi.ANTIALIAS_DEFAULT
    options.set_antialias(cairocffi.ANTIALIAS_FAST)
    assert options.get_antialias() == cairocffi.ANTIALIAS_FAST

    assert options.get_subpixel_order() == cairocffi.SUBPIXEL_ORDER_DEFAULT
    options.set_subpixel_order(cairocffi.SUBPIXEL_ORDER_BGR)
    assert options.get_subpixel_order() == cairocffi.SUBPIXEL_ORDER_BGR

    assert options.get_hint_style() == cairocffi.HINT_STYLE_DEFAULT
    options.set_hint_style(cairocffi.HINT_STYLE_SLIGHT)
    assert options.get_hint_style() == cairocffi.HINT_STYLE_SLIGHT

    assert options.get_hint_metrics() == cairocffi.HINT_METRICS_DEFAULT
    options.set_hint_metrics(cairocffi.HINT_METRICS_OFF)
    assert options.get_hint_metrics() == cairocffi.HINT_METRICS_OFF

    options_1 = FontOptions(hint_metrics=cairocffi.HINT_METRICS_ON)
    assert options_1.get_hint_metrics() == cairocffi.HINT_METRICS_ON
    assert options_1.get_antialias() == cairocffi.HINT_METRICS_DEFAULT
    options_2 = options_1.copy()
    assert options_2 == options_1
    assert len(set([options_1, options_2])) == 1  # test __hash__
    options_2.set_antialias(cairocffi.ANTIALIAS_BEST)
    assert options_2 != options_1
    assert len(set([options_1, options_2])) == 2
    options_1.merge(options_2)
    assert options_2 == options_1


def test_glyphs():
    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 20)
    context = Context(surface)
    font = context.get_scaled_font()
    text = u('Étt')
    glyphs, clusters, is_backwards = font.text_to_glyphs(
        5, 15, text, with_clusters=True)
    assert font.text_to_glyphs(5, 15, text, with_clusters=False) == glyphs
    (idx1, x1, y1), (idx2, x2, y2), (idx3, x3, y3) = glyphs
    assert idx1 != idx2 == idx3
    assert y1 == y2 == y3 == 15
    assert 5 == x1 < x2 < x3
    assert clusters == [(2, 1), (1, 1), (1, 1)]
    assert is_backwards == 0
    assert font.glyph_extents(glyphs) == font.text_extents(text)
    assert font.glyph_extents(glyphs) == context.glyph_extents(glyphs)

    assert context.copy_path() == []
    context.glyph_path(glyphs)
    glyph_path = context.copy_path()
    assert glyph_path
    context.new_path()
    assert context.copy_path() == []
    context.move_to(10, 20)  # Not the same coordinates as text_to_glyphs
    context.text_path(text)
    assert context.copy_path() != []
    assert context.copy_path() != glyph_path
    context.new_path()
    assert context.copy_path() == []
    context.move_to(5, 15)
    context.text_path(text)
    text_path = context.copy_path()
    # For some reason, paths end with a different on old cairo.
    assert text_path[:-1] == glyph_path[:-1]

    empty = b'\x00' * 100 * 20 * 4
    assert surface.get_data()[:] == empty
    context.show_glyphs(glyphs)
    glyph_pixels = surface.get_data()[:]
    assert glyph_pixels != empty

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 20)
    context = Context(surface)
    context.move_to(5, 15)
    context.show_text_glyphs(text, glyphs, clusters, is_backwards)
    text_glyphs_pixels = surface.get_data()[:]
    assert glyph_pixels == text_glyphs_pixels

    surface = ImageSurface(cairocffi.FORMAT_ARGB32, 100, 20)
    context = Context(surface)
    context.move_to(5, 15)
    context.show_text(text)
    text_pixels = surface.get_data()[:]
    assert glyph_pixels == text_pixels


def test_from_null_pointer():
    for class_ in [Surface, Context, Pattern, FontFace, ScaledFont]:
        with pytest.raises(ValueError):
            class_._from_pointer(cairocffi.ffi.NULL, 'unused')