# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

from spack import *
import sys


class Pixman(AutotoolsPackage):
    """The Pixman package contains a library that provides low-level
    pixel manipulation features such as image compositing and
    trapezoid rasterization."""

    homepage = "http://www.pixman.org"
    url      = "http://cairographics.org/releases/pixman-0.32.6.tar.gz"

    version('0.38.0', sha256='a7592bef0156d7c27545487a52245669b00cf7e70054505381cff2136d890ca8')
    version('0.34.0', sha256='21b6b249b51c6800dc9553b65106e1e37d0e25df942c90531d4c3997aa20a88e')
    version('0.32.6', sha256='3dfed13b8060eadabf0a4945c7045b7793cc7e3e910e748a8bb0f0dc3e794904')

    depends_on('pkgconfig', type='build')
    depends_on('libpng')

    # As discussed here:
    # https://bugs.freedesktop.org/show_bug.cgi?id=104886
    # __builtin_shuffle was removed in clang 5.0.
    # From version 9.1 apple-clang is based on clang 5.0.
    # Patch is obtained from above link.
    patch('clang.patch', when='@0.34%clang@9.1.0-apple:')

    @run_before('build')
    def patch_config_h_for_intel(self):
        config_h = join_path(self.stage.source_path, 'config.h')

        # Intel disguises itself as GNU, but doesn't implement
        # the same builtin functions. This causes in this case
        # a positive detection of GCC vector extensions, which
        # is bound to fail at compile time because Intel has no
        # __builtin_shuffle. See also:
        #
        # https://software.intel.com/en-us/forums/intel-c-compiler/topic/758013
        #
        if '%intel' in self.spec:
            filter_file(
                r'#define HAVE_GCC_VECTOR_EXTENSIONS /\*\*/',
                '/* #undef HAVE_GCC_VECTOR_EXTENSIONS */',
                config_h
            )

    def configure_args(self):
        args = [
            '--enable-libpng',
            '--disable-gtk',
        ]

        if sys.platform == 'darwin':
            args.append('--disable-mmx')

        return args