Build Android Framework host library on Mac

Based on ag/5616352, patch set 5.

Bug: b/118742766
Test: lunch sdk && mmma external/skia on Mac

Similar to the linux build, use a new set of GN arguments to create a
json object to fill in the updated template.

Add the new include/config/mac folder for the newly generated mac-
specific SkUserConfig.h.

Include stdarg.h in SkTraceEventCommon, which is necessary for the mac
build.

Add a new GN arg (skia_use_fonthost_mac) to allow framework build to
manually not build SkFontHost_mac.cpp, and use the same font host
as the other builds.

Change-Id: I654ba496306a3f3591c3937ad5524cd45e49dd65
Reviewed-on: https://skia-review.googlesource.com/c/173183
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>

Author: LeonScroggins

BUILD.gn

@@ -25,6 +25,7 @@ declare_args() {
   skia_use_egl = false
   skia_use_expat = true
   skia_use_fontconfig = is_linux
+  skia_use_fonthost_mac = is_mac
   skia_use_freetype = is_android || is_fuchsia || is_linux
   skia_use_fixed_gamma_text = is_android
   skia_use_icu = !is_fuchsia && !is_ios && !is_win  # TODO: Windows
@@ -982,10 +983,15 @@ component("skia") {
     }
   }
 
+  if (skia_use_fonthost_mac) {
+    sources += [
+      "src/ports/SkFontHost_mac.cpp",
+    ]
+  }
+
   if (is_mac) {
     sources += [
       "src/ports/SkDebug_stdio.cpp",
-      "src/ports/SkFontHost_mac.cpp",
       "src/ports/SkImageEncoder_CG.cpp",
       "src/ports/SkImageGeneratorCG.cpp",
     ]

gn/gn_to_bp.py

@@ -114,6 +114,20 @@
           "include/config/linux",
         ],
       },
+      darwin: {
+        cflags: [
+          "-mssse3",
+        ],
+        srcs: [
+          $mac_srcs
+        ],
+        local_include_dirs: [
+          "include/config/mac",
+        ],
+        export_include_dirs: [
+          "include/config/mac",
+        ],
+      },
     },
 
     defaults: ["skia_deps",
@@ -179,6 +193,11 @@
             "libnativewindow",
         ],
       },
+      darwin: {
+        host_ldlibs: [
+            "-framework AppKit",
+        ],
+      },
     },
 }
 
@@ -268,6 +287,21 @@
   'skia_use_fixed_gamma_text':          'true',
 }
 
+gn_args_mac = {
+  'is_official_build':                  'true',
+  'skia_enable_tools':                  'true',
+  'skia_enable_gpu'  :                  'false',
+  'skia_use_libheif':                   'false',
+  'skia_use_vulkan':                    'false',
+  'target_cpu':                         '"none"',
+  'target_os':                          '"mac"',
+  'skia_use_fixed_gamma_text':          'true',
+  'skia_enable_fontmgr_custom_empty':   'true',
+  'skia_use_fonthost_mac':              'false',
+  'skia_use_freetype':                  'true',
+  'skia_enable_fontmgr_android':        'false',
+}
+
 js = gn_to_bp_utils.GenerateJSONFromGN(gn_args)
 
 def strip_slashes(lst):
@@ -307,9 +341,16 @@ def strip_headers(sources):
                                    None)
 linux_srcs      = strip_headers(linux_srcs)
 
-srcs = android_srcs.intersection(linux_srcs)
+js_mac          = gn_to_bp_utils.GenerateJSONFromGN(gn_args_mac)
+mac_srcs        = strip_slashes(js_mac['targets']['//:skia']['sources'])
+gn_to_bp_utils.GrabDependentValues(js_mac, '//:skia', 'sources', mac_srcs,
+                                   None)
+mac_srcs        = strip_headers(mac_srcs)
+
+srcs = android_srcs.intersection(linux_srcs).intersection(mac_srcs)
 android_srcs    = android_srcs.difference(srcs)
 linux_srcs      =   linux_srcs.difference(srcs)
+mac_srcs        =   mac_srcs.difference(srcs)
 dm_srcs         = strip_headers(dm_srcs)
 nanobench_srcs  = strip_headers(nanobench_srcs)
 
@@ -323,12 +364,14 @@ def get_defines(json):
   return {str(d) for d in json['targets']['//:skia']['defines']}
 android_defines = get_defines(js)
 linux_defines   = get_defines(js_linux)
+mac_defines     = get_defines(js_mac)
 
 def mkdir_if_not_exists(path):
   if not os.path.exists(path):
     os.mkdir(path)
 mkdir_if_not_exists('include/config/android/')
 mkdir_if_not_exists('include/config/linux/')
+mkdir_if_not_exists('include/config/mac/')
 
 platforms = { 'IOS', 'MAC', 'WIN', 'ANDROID', 'UNIX' }
 
@@ -358,18 +401,21 @@ def append_to_file(config, s):
 #endif''')
 disallow_platforms(android_config, 'ANDROID')
 
-linux_config = 'include/config/linux/SkUserConfig.h'
-gn_to_bp_utils.WriteUserConfig(linux_config, linux_defines)
-append_to_file(linux_config, '''
+def write_config(config_path, defines, platform):
+  gn_to_bp_utils.WriteUserConfig(config_path, defines)
+  append_to_file(config_path, '''
 // Correct SK_BUILD_FOR flags that may have been set by
 // SkPreConfig.h/Android.bp
-#ifndef SK_BUILD_FOR_UNIX
-    #define SK_BUILD_FOR_UNIX
+#ifndef SK_BUILD_FOR_%s
+    #define SK_BUILD_FOR_%s
 #endif
 #ifdef SK_BUILD_FOR_ANDROID
     #undef SK_BUILD_FOR_ANDROID
-#endif''')
-disallow_platforms(linux_config, 'UNIX')
+#endif''' % (platform, platform))
+  disallow_platforms(config_path, platform)
+
+write_config('include/config/linux/SkUserConfig.h', linux_defines, 'UNIX')
+write_config('include/config/mac/SkUserConfig.h',   mac_defines, 'MAC')
 
 # Turn a list of strings into the style bpfmt outputs.
 def bpfmt(indent, lst, sort=True):
@@ -406,4 +452,5 @@ def bpfmt(indent, lst, sort=True):
 
     'android_srcs':  bpfmt(10, android_srcs),
     'linux_srcs':    bpfmt(10, linux_srcs),
+    'mac_srcs':      bpfmt(10, mac_srcs),
   })

src/core/SkTraceEventCommon.h

@@ -62,6 +62,8 @@
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
 
 #include <cutils/trace.h>
+#include <stdarg.h>
+
 class SkAndroidFrameworkTraceUtil {
 public:
     SkAndroidFrameworkTraceUtil(const char* name) {