Production quality fast image up/downsampler

gyp/opts.gyp

 {
   'targets': [
     # Due to an unfortunate intersection of lameness between gcc and gyp,
     # we have to build the *_SSE2.cpp files in a separate target.  The
     # gcc lameness is that, in order to compile SSE2 intrinsics code, it
     # must be passed the -msse2 flag.  However, with this flag, it may
     # emit SSE2 instructions even for scalar code, such as the CPUID
     # test used to test for the presence of SSE2.  So that, and all other
     # code must be compiled *without* -msse2.  The gyp lameness is that it
     # does not allow file-specific CFLAGS, so we must create this extra
@@ skipping 17 matching lines @@
         '../include/core',
         '../src/core',
         '../src/opts',
       ],
       'conditions': [
         [ 'skia_arch_type == "x86" and skia_os != "ios"', {
           'conditions': [
             [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "nacl", "chromeos"]', {
               'cflags': [
                 '-msse2',
+                '-DSKIA_SSE',
               ],
             }],
             [ 'skia_os != "android"', {
               'dependencies': [
                 'opts_ssse3',
               ],
             }],
           ],
           'include_dirs': [
             '../include/utils',
@@ skipping 129 matching lines @@
       ],
     },
   ],
 }
 
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