Fix tests to run on Cairo 1.18.0 (#3416)

* Add a script to build and install cairo

* Update gui tests for cairo 1.18.0

* update script to set env vars

* Make the script run with plain python

* Prefer the recently built one in pkg-config

* Skip the built if it's windows

* CI: build and install latest cairo

* CI: only run when cache is missed

* Disable compiling tests while building cairo

* update poetry lock file

* Display the cairo version when running pytest

* fixup

* tests: skip graphical test when cairo is old

* fix the path to find the pkgconfig files on linux

* set the LD_LIBRARY_PATH too

only then it'll work on linux

* fixup

* small fixup

* Move the script inside `.github/scripts` folder

* Make the minimum cairo version a constant

* Seperate setting env vars to a sperate step

this seem to have broken when cache is hit

.github/scripts/ci_build_cairo.py

@@ -0,0 +1,209 @@
+# Logic is as follows:
+# 1. Download cairo source code: https://cairographics.org/releases/cairo-<version>.tar.xz
+# 2. Verify the downloaded file using the sha256sums file: https://cairographics.org/releases/cairo-<version>.tar.xz.sha256sum
+# 3. Extract the downloaded file.
+# 4. Create a virtual environment and install meson and ninja.
+# 5. Run meson build in the extracted directory. Also, set required prefix.
+# 6. Run meson compile -C build.
+# 7. Run meson install -C build.
+
+import hashlib
+import logging
+import os
+import subprocess
+import sys
+import tarfile
+import tempfile
+import typing
+import urllib.request
+from contextlib import contextmanager
+from pathlib import Path
+from sys import stdout
+
+CAIRO_VERSION = "1.18.0"
+CAIRO_URL = f"https://cairographics.org/releases/cairo-{CAIRO_VERSION}.tar.xz"
+CAIRO_SHA256_URL = f"{CAIRO_URL}.sha256sum"
+
+VENV_NAME = "meson-venv"
+BUILD_DIR = "build"
+INSTALL_PREFIX = Path(__file__).parent.parent / "third_party" / "cairo"
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
+logger = logging.getLogger(__name__)
+
+
+def is_ci():
+    return os.getenv("CI", None) is not None
+
+
+def download_file(url, path):
+    logger.info(f"Downloading {url} to {path}")
+    block_size = 1024 * 1024
+    with urllib.request.urlopen(url) as response, open(path, "wb") as file:
+        while True:
+            data = response.read(block_size)
+            if not data:
+                break
+            file.write(data)
+
+
+def verify_sha256sum(path, sha256sum):
+    with open(path, "rb") as file:
+        file_hash = hashlib.sha256(file.read()).hexdigest()
+    if file_hash != sha256sum:
+        raise Exception("SHA256SUM does not match")
+
+
+def extract_tar_xz(path, directory):
+    with tarfile.open(path) as file:
+        file.extractall(directory)
+
+
+def run_command(command, cwd=None, env=None):
+    process = subprocess.Popen(command, cwd=cwd, env=env)
+    process.communicate()
+    if process.returncode != 0:
+        raise Exception("Command failed")
+
+
+@contextmanager
+def gha_group(title: str) -> typing.Generator:
+    if not is_ci():
+        yield
+        return
+    print(f"\n::group::{title}")
+    stdout.flush()
+    try:
+        yield
+    finally:
+        print("::endgroup::")
+        stdout.flush()
+
+
+def set_env_var_gha(name: str, value: str) -> None:
+    if not is_ci():
+        return
+    env_file = os.getenv("GITHUB_ENV", None)
+    if env_file is None:
+        return
+    with open(env_file, "a") as file:
+        file.write(f"{name}={value}\n")
+    stdout.flush()
+
+
+def get_ld_library_path(prefix: Path) -> str:
+    # given a prefix, the ld library path can be found at
+    # <prefix>/lib/* or sometimes just <prefix>/lib
+    # this function returns the path to the ld library path
+
+    # first, check if the ld library path exists at <prefix>/lib/*
+    ld_library_paths = list(prefix.glob("lib/*"))
+    if len(ld_library_paths) == 1:
+        return ld_library_paths[0].absolute().as_posix()
+
+    # if the ld library path does not exist at <prefix>/lib/*,
+    # return <prefix>/lib
+    ld_library_path = prefix / "lib"
+    if ld_library_path.exists():
+        return ld_library_path.absolute().as_posix()
+    return ""
+
+
+def main():
+    if sys.platform == "win32":
+        logger.info("Skipping build on windows")
+        return
+
+    with tempfile.TemporaryDirectory() as tmpdir:
+        with gha_group("Downloading and Extracting Cairo"):
+            logger.info(f"Downloading cairo version {CAIRO_VERSION}")
+            download_file(CAIRO_URL, os.path.join(tmpdir, "cairo.tar.xz"))
+
+            logger.info("Downloading cairo sha256sum")
+            download_file(CAIRO_SHA256_URL, os.path.join(tmpdir, "cairo.sha256sum"))
+
+            logger.info("Verifying cairo sha256sum")
+            with open(os.path.join(tmpdir, "cairo.sha256sum")) as file:
+                sha256sum = file.read().split()[0]
+            verify_sha256sum(os.path.join(tmpdir, "cairo.tar.xz"), sha256sum)
+
+            logger.info("Extracting cairo")
+            extract_tar_xz(os.path.join(tmpdir, "cairo.tar.xz"), tmpdir)
+
+        with gha_group("Installing meson and ninja"):
+            logger.info("Creating virtual environment")
+            run_command([sys.executable, "-m", "venv", os.path.join(tmpdir, VENV_NAME)])
+
+            logger.info("Installing meson and ninja")
+            run_command(
+                [
+                    os.path.join(tmpdir, VENV_NAME, "bin", "pip"),
+                    "install",
+                    "meson",
+                    "ninja",
+                ]
+            )
+
+        env_vars = {
+            # add the venv bin directory to PATH so that meson can find ninja
+            "PATH": f"{os.path.join(tmpdir, VENV_NAME, 'bin')}{os.pathsep}{os.environ['PATH']}",
+        }
+
+        with gha_group("Building and Installing Cairo"):
+            logger.info("Running meson setup")
+            run_command(
+                [
+                    os.path.join(tmpdir, VENV_NAME, "bin", "meson"),
+                    "setup",
+                    BUILD_DIR,
+                    f"--prefix={INSTALL_PREFIX.absolute().as_posix()}",
+                    "--buildtype=release",
+                    "-Dtests=disabled",
+                ],
+                cwd=os.path.join(tmpdir, f"cairo-{CAIRO_VERSION}"),
+                env=env_vars,
+            )
+
+            logger.info("Running meson compile")
+            run_command(
+                [
+                    os.path.join(tmpdir, VENV_NAME, "bin", "meson"),
+                    "compile",
+                    "-C",
+                    BUILD_DIR,
+                ],
+                cwd=os.path.join(tmpdir, f"cairo-{CAIRO_VERSION}"),
+                env=env_vars,
+            )
+
+            logger.info("Running meson install")
+            run_command(
+                [
+                    os.path.join(tmpdir, VENV_NAME, "bin", "meson"),
+                    "install",
+                    "-C",
+                    BUILD_DIR,
+                ],
+                cwd=os.path.join(tmpdir, f"cairo-{CAIRO_VERSION}"),
+                env=env_vars,
+            )
+
+        logger.info(f"Successfully built cairo and installed it to {INSTALL_PREFIX}")
+
+
+if __name__ == "__main__":
+    if "--set-env-vars" in sys.argv:
+        with gha_group("Setting environment variables"):
+            # append the pkgconfig directory to PKG_CONFIG_PATH
+            set_env_var_gha(
+                "PKG_CONFIG_PATH",
+                f"{Path(get_ld_library_path(INSTALL_PREFIX), 'pkgconfig').as_posix()}{os.pathsep}"
+                f'{os.getenv("PKG_CONFIG_PATH", "")}',
+            )
+            set_env_var_gha(
+                "LD_LIBRARY_PATH",
+                f"{get_ld_library_path(INSTALL_PREFIX)}{os.pathsep}"
+                f'{os.getenv("LD_LIBRARY_PATH", "")}',
+            )
+        sys.exit(0)
+    main()

.github/workflows/ci.yml

@@ -76,6 +76,22 @@ jobs:
           # start xvfb in background
           sudo /usr/bin/Xvfb $DISPLAY -screen 0 1280x1024x24 &
 
+      - name: Setup Cairo Cache
+        uses: actions/cache@v3
+        id: cache-cairo
+        if: runner.os == 'Linux' || runner.os == 'macOS'
+        with:
+          path: ${{ github.workspace }}/third_party
+          key: ${{ runner.os }}-dependencies-cairo-${{ hashFiles('.github/scripts/ci_build_cairo.py') }}
+
+      - name: Build and install Cairo (Linux and macOS)
+        if: (runner.os == 'Linux' || runner.os == 'macOS') && steps.cache-cairo.outputs.cache-hit != 'true'
+        run: python .github/scripts/ci_build_cairo.py
+
+      - name: Set env vars for Cairo (Linux and macOS)
+        if: runner.os == 'Linux' || runner.os == 'macOS'
+        run: python .github/scripts/ci_build_cairo.py --set-env-vars
+
       - name: Setup macOS cache
         uses: actions/cache@v3
         id: cache-macos
@@ -103,10 +119,6 @@ jobs:
           export PATH="$oriPath"
           echo "Completed TinyTeX"
 
-      - name: Install cairo (MacOS)
-        if: runner.os == 'macOS'
-        run: brew install cairo
-
       - name: Add macOS dependencies to PATH
         if: runner.os == 'macOS'
         shell: bash

.gitignore

@@ -131,3 +131,6 @@ dist/
 
 /media_dir.txt
 # ^TODO: Remove the need for this with a proper config file
+
+# Ignore the built dependencies
+third_party/*

conftest.py

@@ -11,6 +11,7 @@ try:
 except ModuleNotFoundError:  # windows
     pass
 
+import cairo
 import moderngl
 
 # If it is running Doctest the current directory
@@ -39,6 +40,7 @@ def pytest_report_header(config):
     info = ctx.info
     ctx.release()
     return (
+        f"\nCairo Version: {cairo.cairo_version()}",
         "\nOpenGL information",
         "------------------",
         f"vendor: {info['GL_VENDOR'].strip()}",

manim/utils/testing/frames_comparison.py

@@ -5,6 +5,8 @@ import inspect
 from pathlib import Path
 from typing import Callable
 
+import cairo
+import pytest
 from _pytest.fixtures import FixtureRequest
 
 from manim import Scene
@@ -25,6 +27,7 @@ from ._test_class_makers import (
 SCENE_PARAMETER_NAME = "scene"
 _tests_root_dir_path = Path(__file__).absolute().parents[2]
 PATH_CONTROL_DATA = _tests_root_dir_path / Path("control_data", "graphical_units_data")
+MIN_CAIRO_VERSION = 11800
 
 
 def frames_comparison(
@@ -81,6 +84,12 @@ def frames_comparison(
         @functools.wraps(tested_scene_construct)
         # The "request" parameter is meant to be used as a fixture by pytest. See below.
         def wrapper(*args, request: FixtureRequest, tmp_path, **kwargs):
+            # check for cairo version
+            if (
+                renderer_class is CairoRenderer
+                and cairo.cairo_version() < MIN_CAIRO_VERSION
+            ):
+                pytest.skip("Cairo version is too old. Skipping cairo graphical tests.")
             # Wraps the test_function to a construct method, to "freeze" the eventual additional arguments (parametrizations fixtures).
             construct = functools.partial(tested_scene_construct, *args, **kwargs)
 

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
 
 [[package]]
 name = "aiofiles"
@@ -273,30 +273,30 @@ lxml = ["lxml"]
 
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     {file = "MarkupSafe-2.1.3-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:8e254ae696c88d98da6555f5ace2279cf7cd5b3f52be2b5cf97feafe883b58d2"},
     {file = "MarkupSafe-2.1.3-cp37-cp37m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:cb0932dc158471523c9637e807d9bfb93e06a95cbf010f1a38b98623b929ef2b"},
     {file = "MarkupSafe-2.1.3-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:9402b03f1a1b4dc4c19845e5c749e3ab82d5078d16a2a4c2cd2df62d57bb0707"},
@@ -4913,14 +4923,14 @@ zstd = ["zstandard (>=0.18.0)"]
 
 [[package]]
 name = "virtualenv"
-version = "20.24.5"
+version = "20.24.6"
 description = "Virtual Python Environment builder"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "virtualenv-20.24.5-py3-none-any.whl", hash = "sha256:b80039f280f4919c77b30f1c23294ae357c4c8701042086e3fc005963e4e537b"},
-    {file = "virtualenv-20.24.5.tar.gz", hash = "sha256:e8361967f6da6fbdf1426483bfe9fca8287c242ac0bc30429905721cefbff752"},
+    {file = "virtualenv-20.24.6-py3-none-any.whl", hash = "sha256:520d056652454c5098a00c0f073611ccbea4c79089331f60bf9d7ba247bb7381"},
+    {file = "virtualenv-20.24.6.tar.gz", hash = "sha256:02ece4f56fbf939dbbc33c0715159951d6bf14aaf5457b092e4548e1382455af"},
 ]
 
 [package.dependencies]