Add gn_to_bp script for SkQP.

This refactors the current gn_to_bp script and moves the common
components into a utils class.  Both gn_to_bp scripts now also
accept an optional param (--gn <gn_path>) to make it easier to run
within the Android tree where we don't have the DEPS synced.

Change-Id: Idc4de7b3993e63e21a5b7137b1873d82a8e1843e
Reviewed-on: https://skia-review.googlesource.com/102184
Commit-Queue: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>

1 files changed, 213 insertions, 0 deletions

diff --git a/tools/skqp/gn_to_bp.py b/tools/skqp/gn_to_bp.py
new file mode 100644
index 0000000000..5f0ac9a26b
--- /dev/null
+++ b/tools/skqp/gn_to_bp.py
@@ -0,0 +1,213 @@
+#!/usr/bin/env python
+#
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Generate Android.bp for Skia from GN configuration.
+
+import argparse
+import json
+import os
+import pprint
+import string
+import subprocess
+import sys
+import tempfile
+
+root_dir = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                        os.pardir, os.pardir)
+skia_gn_dir = os.path.join(root_dir, 'gn')
+sys.path.insert(0, skia_gn_dir)
+
+import gn_to_bp_utils
+
+# First we start off with a template for Android.bp,
+# with holes for source lists and include directories.
+bp = string.Template('''// This file is autogenerated by tools/skqp/gn_to_bp.py.
+
+cc_library_shared {
+    name: "libskqp_app",
+    sdk_version: "26",
+    stl: "libc++_static",
+    tags: ["tests", "optional"],
+
+    cflags: [
+        $cflags
+        "-Wno-unused-parameter",
+        "-Wno-unused-variable",
+    ],
+
+    cppflags:[
+        $cflags_cc
+    ],
+
+    local_include_dirs: [
+        $local_includes
+    ],
+
+    srcs: [
+        $srcs
+    ],
+
+    arch: {
+        arm: {
+            srcs: [
+                $arm_srcs
+            ],
+
+            neon: {
+                srcs: [
+                    $arm_neon_srcs
+                ],
+            },
+        },
+
+        arm64: {
+            srcs: [
+                $arm64_srcs
+            ],
+        },
+
+        mips: {
+            srcs: [
+                $none_srcs
+            ],
+        },
+
+        mips64: {
+            srcs: [
+                $none_srcs
+            ],
+        },
+
+        x86: {
+            srcs: [
+                $x86_srcs
+            ],
+            cflags: [
+                // Clang seems to think new/malloc will only be 4-byte aligned
+                // on x86 Android. We're pretty sure it's actually 8-byte
+                // alignment. tests/OverAlignedTest.cpp has more information,
+                // and should fail if we're wrong.
+                "-Wno-over-aligned"
+            ],
+        },
+
+        x86_64: {
+            srcs: [
+                $x86_srcs
+            ],
+        },
+    },
+
+    shared_libs: [
+          "libandroid",
+          "libEGL",
+          "libGLESv2",
+          "liblog",
+          "libvulkan",
+          "libz",
+    ],
+    static_libs: [
+          "libjpeg_static_ndk",
+          "libjsoncpp",
+          "libpng_ndk",
+          "libwebp-decode",
+          "libwebp-encode",
+    ]
+}''')
+
+# We'll run GN to get the main source lists and include directories for Skia.
+gn_args = {
+  'is_debug':   'false',
+  'target_cpu': '"none"',
+  'target_os':  '"android"',
+  'ndk_api':    '26',
+
+  # setup vulkan
+  'skia_use_vulkan':    'true',
+  'skia_vulkan_header': '"Skia_Vulkan_Android.h"',
+
+  # enable/disable skia subsystems
+  'skia_enable_fontmgr_empty': 'true',
+  'skia_enable_pdf':           'false',
+  'skia_use_expat':            'false',
+  'skia_use_dng_sdk':          'false',
+  'skia_use_icu':              'false',
+  'skia_use_lua':              'false',
+  'skia_use_piex':             'false',
+  'skia_use_skcms':            'false',
+
+  # specify that the Android.bp will supply the necessary components
+  'skia_use_system_expat':         'true', # removed this when gn is fixed
+  'skia_use_system_libpng':        'true',
+  'skia_use_system_jsoncpp':       'true',
+  'skia_use_system_libwebp':       'true',
+  'skia_use_system_libjpeg_turbo': 'true',
+  'skia_use_system_zlib':          'true',
+}
+
+js = gn_to_bp_utils.GenerateJSONFromGN(gn_args)
+
+def strip_slashes(lst):
+  return {str(p.lstrip('/')) for p in lst}
+
+srcs            = strip_slashes(js['targets']['//:libskqp_app']['sources'])
+cflags          = strip_slashes(js['targets']['//:libskqp_app']['cflags'])
+cflags_cc       = strip_slashes(js['targets']['//:libskqp_app']['cflags_cc'])
+local_includes  = strip_slashes(js['targets']['//:libskqp_app']['include_dirs'])
+defines      = {str(d) for d in js['targets']['//:libskqp_app']['defines']}
+
+gn_to_bp_utils.GrabDependentValues(js, '//:libskqp_app', 'sources', srcs, None)
+gn_to_bp_utils.GrabDependentValues(js, '//:libskqp_app', 'include_dirs',
+                                   local_includes, 'freetype')
+gn_to_bp_utils.GrabDependentValues(js, '//:libskqp_app', 'defines',
+                                   defines, None)
+
+# No need to list headers or other extra flags.
+srcs = {s for s in srcs           if not s.endswith('.h')}
+cflags = gn_to_bp_utils.CleanupCFlags(cflags)
+cflags_cc = gn_to_bp_utils.CleanupCCFlags(cflags_cc)
+
+# We need to add the include path to the vulkan defines and header file set in
+# then skia_vulkan_header gn arg that is used for framework builds.
+local_includes.add("platform_tools/android/vulkan")
+
+# Get architecture specific source files
+defs = gn_to_bp_utils.GetArchSources(os.path.join(skia_gn_dir, 'opts.gni'))
+
+# Add source file until fix lands in
+# https://skia-review.googlesource.com/c/skia/+/101820
+srcs.add("src/ports/SkFontMgr_empty_factory.cpp")
+
+# Turn a list of strings into the style bpfmt outputs.
+def bpfmt(indent, lst, sort=True):
+  if sort:
+    lst = sorted(lst)
+  return ('\n' + ' '*indent).join('"%s",' % v for v in lst)
+
+# Most defines go into SkUserConfig.h, where they're seen by Skia and its users.
+gn_to_bp_utils.WriteUserConfig('include/config/SkUserConfig.h', defines)
+
+# OK!  We have everything to fill in Android.bp...
+with open('Android.bp', 'w') as f:
+  print >>f, bp.substitute({
+    'local_includes': bpfmt(8, local_includes),
+    'srcs':           bpfmt(8, srcs),
+    'cflags':         bpfmt(8, cflags, False),
+    'cflags_cc':      bpfmt(8, cflags_cc),
+
+    'arm_srcs':       bpfmt(16, defs['armv7']),
+    'arm_neon_srcs':  bpfmt(20, defs['neon']),
+    'arm64_srcs':     bpfmt(16, defs['arm64'] +
+                                defs['crc32']),
+    'none_srcs':      bpfmt(16, defs['none']),
+    'x86_srcs':       bpfmt(16, defs['sse2'] +
+                                defs['ssse3'] +
+                                defs['sse41'] +
+                                defs['sse42'] +
+                                defs['avx'  ]),
+  })
+