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emscripten-core
GitHub Repository: emscripten-core/emscripten
 Path: blob/main/tools/ports/libpng.py
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# Copyright 2015 The Emscripten Authors.  All rights reserved.

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# Emscripten is available under two separate licenses, the MIT license and the

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# University of Illinois/NCSA Open Source License.  Both these licenses can be

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# found in the LICENSE file.

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import os

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import shutil

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TAG = '1.6.39'

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HASH = '19851afffbe2ffde62d918f7e9017dec778a7ce9c60c75cdc65072f086e6cdc9d9895eb7b207535a84cb5f4ead77ebc2aa9d80025f153662903023e1f7ab9bae'

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deps = ['zlib']

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variants = {

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  'libpng-mt': {'PTHREADS': 1},

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  'libpng-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},

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  'libpng-mt-legacysjlj': {'PTHREADS': 1, 'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},

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}

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def needed(settings):

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  return settings.USE_LIBPNG

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def get_lib_name(settings):

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  suffix = ''

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  if settings.PTHREADS:

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    suffix += '-mt'

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  if settings.SUPPORT_LONGJMP == 'wasm':

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    suffix += '-legacysjlj'

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  return f'libpng{suffix}.a'

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def get(ports, settings, shared):

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  # This is an emscripten-hosted mirror of the libpng repo from Sourceforge.

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  ports.fetch_project('libpng', f'https://storage.googleapis.com/webassembly/emscripten-ports/libpng-{TAG}.tar.gz', sha512hash=HASH)

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  def create(final):

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    source_path = ports.get_dir('libpng', 'libpng-' + TAG)

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    pnglibconf_h = os.path.join(os.path.dirname(__file__), 'libpng/pnglibconf.h')

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    shutil.copyfile(pnglibconf_h, os.path.join(source_path, 'pnglibconf.h'))

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    ports.install_headers(source_path)

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    flags = ['-sUSE_ZLIB']

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    if settings.PTHREADS:

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      flags += ['-pthread']

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    if settings.SUPPORT_LONGJMP == 'wasm':

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      flags.append('-sSUPPORT_LONGJMP=wasm')

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    ports.build_port(source_path, final, 'libpng', flags=flags, exclude_files=['pngtest'], exclude_dirs=['scripts', 'contrib'])

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  return [shared.cache.get_lib(get_lib_name(settings), create, what='port')]

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def clear(ports, settings, shared):

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  shared.cache.erase_lib(get_lib_name(settings))

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def process_dependencies(settings):

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  settings.USE_ZLIB = 1

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def show():

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  return 'libpng (-sUSE_LIBPNG or --use-port=libpng; zlib license)'

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