[telemetry] Implement per-pixel algorithms in Bitmap as a C++ extension.

tools/telemetry/telemetry/core/build_extension.py

Index: tools/telemetry/telemetry/core/build_extension.py
diff --git a/tools/telemetry/telemetry/core/build_extension.py b/tools/telemetry/telemetry/core/build_extension.py
new file mode 100644
index 0000000000000000000000000000000000000000..38a635fc4c24ce1423009e5b8725ae74308cfe03
--- /dev/null
+++ b/tools/telemetry/telemetry/core/build_extension.py
@@ -0,0 +1,60 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+def _FixDistutilsMsvcCompiler():
+  # To avoid runtime mismatch, distutils should use the compiler which was used
+  # to build python. But our module does not use the runtime much, so it should
+  # be fine to build within a different environment.
+  # See also: http://bugs.python.org/issue7511
+  from distutils import msvc9compiler
+  for version in [msvc9compiler.get_build_version(), 9.0, 10.0, 11.0, 12.0]:
+    msvc9compiler.VERSION = version
+    try:
+      msvc9compiler.MSVCCompiler().initialize()
+      return
+    except Exception:
+      pass
+  raise Exception('Could not initialize MSVC compiler for distutils.')
+
+
+def BuildExtension(sources, output_dir, extension_name):
+  from distutils import log
+  from distutils.core import Distribution, Extension
+  import os
+  import tempfile
+
+  build_dir = tempfile.mkdtemp()
+  # Source file paths must be relative to current path.
+  cwd = os.getcwd()
+  src_files = [os.path.relpath(filename, cwd) for filename in sources]
+
+  ext = Extension(extension_name, src_files)
+
+  if os.name == 'nt':
+    _FixDistutilsMsvcCompiler()
+    # VS 2010 does not generate manifest, see http://bugs.python.org/issue4431
+    ext.extra_link_args = ['/MANIFEST']
+
+  dist = Distribution({
+    'ext_modules': [ext]
+  })
+  dist.script_args = ['build_ext', '--build-temp', build_dir,
+                      '--build-lib', output_dir]
+  dist.parse_command_line()
+  log.set_threshold(log.DEBUG)
+  dist.run_commands()
+  dist.script_args = ['clean', '--build-temp', build_dir, '--all']
+  dist.parse_command_line()
+  log.set_threshold(log.DEBUG)
+  dist.run_commands()
+
+
+if __name__ == '__main__':
+  import sys
+  assert len(sys.argv) > 3, (
+    'Usage: build.py source-files output-dir ext-name\n'
+    'got: ' + str(sys.argv)
+  )
+  BuildExtension(sys.argv[1:-2], sys.argv[-2], sys.argv[-1])