Individually enable and disable SkCodecs

gyp/codec.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # GYP file for codec project.
 {
   'targets': [
     {
       'target_name': 'codec',
       'product_name': 'skia_codec',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
         'giflib.gyp:giflib',
         'libjpeg-turbo-selector.gyp:libjpeg-turbo-selector',
         'libpng.gyp:libpng',
         'libwebp.gyp:libwebp',
       ],
-      'cflags':[
-        # FIXME: This gets around a longjmp warning. See
-        # http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-x86_64-Release-Trybot/builds/113/steps/build%20most/logs/stdio
-        '-Wno-clobbered -Wno-error',
+      'cflags':[   
+        # FIXME: This gets around a warning: "Argument might be clobbered by longjmp". 
+        '-Wno-clobbered -Wno-error',   
       ],
       'include_dirs': [
         '../include/codec',
         '../include/private',
         '../src/codec',
         '../src/core',
         '../src/utils',
       ],
       'sources': [
         '../src/codec/SkAndroidCodec.cpp',
@@ skipping 19 matching lines @@
         '../src/codec/SkWebpCodec.cpp',
 
         '../src/codec/SkCodecImageGenerator.cpp',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/codec',
         ],
       },
       'defines': [
+        # Turn on all of the codecs, since we know that we have all of the
+        # necessary dependencies.  Clients that are missing some of the
+        # required decoding libraries may choose to turn the codecs on or
+        # off individually.
+        'SK_CODEC_DECODES_GIF',
+        'SK_CODEC_DECODES_JPEG',
+        'SK_CODEC_DECODES_PNG',
+        'SK_CODEC_DECODES_WEBP',
+
+        # Turn on libjpeg-turbo optimizations since we know that the
+        # appropriate version of libjpeg-turbo is present.      
         'TURBO_HAS_SKIP',
         'TURBO_HAS_565',
       ],
       'conditions': [
         ['skia_codec_decodes_raw', {
           'dependencies': [
             'raw_codec',
           ],
         },],
       ],
@@ skipping 43 matching lines @@
         ['skia_os == "ios" or skia_os == "mac"', {
           'xcode_settings': {
             'OTHER_CFLAGS': ['-fexceptions'],
             'OTHER_CPLUSPLUSFLAGS': ['-fexceptions'],
           },
         }],
       ],
     },
   ],
 }