Set gamma correction settings to match platform.

skia/skia.gyp

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'skia',
       'type': '<(component)',
       'variables': {
@@ skipping 191 matching lines @@
         '../third_party/skia/include/pipe',
         '../third_party/skia/include/ports',
         '../third_party/skia/include/utils',
         '../third_party/skia/src/core',
         '../third_party/skia/src/gpu',
         '../third_party/skia/src/sfnt',
         '../third_party/skia/src/utils',
       ],
       'msvs_disabled_warnings': [4244, 4267, 4341, 4345, 4390, 4554, 4748, 4800],
       'defines': [
-        'SK_GAMMA_SRGB',
+        #'SK_GAMMA_SRGB',
         #'SK_GAMMA_APPLY_TO_A8',
         'SK_BUILD_NO_IMAGE_ENCODE',
         'GR_GL_CUSTOM_SETUP_HEADER="GrGLConfig_chrome.h"',
         'GR_STATIC_RECT_VB=1',
         'GR_AGGRESSIVE_SHADER_OPTS=1',
         'SK_DISABLE_FAST_AA_STROKE_RECT',
         'SK_DEFERRED_CANVAS_USES_GPIPE=1',
         
         # this flag can be removed entirely once this has baked for a while
         'SK_ALLOW_OVER_32K_BITMAPS',
@@ skipping 19 matching lines @@
         '../third_party/skia/include/core/SkTypes.h',
       ],
       'conditions': [
         ['order_profiling != 0', {
           'target_conditions' : [
             ['_toolset=="target"', {
               'cflags!': [ '-finstrument-functions' ],
             }],
           ],
         }],
+        #Settings for text blitting, chosen to approximate the system browser.
+        [ 'OS == "linux"', {
+          'defines': [
+            'SK_GAMMA_EXPONENT=1.2',
+            'SK_GAMMA_CONTRAST=0.2',
+          ],
+        }],
+        ['OS == "android" or OS == "win"', {
+          'defines': [
+            'SK_GAMMA_SRGB',
+            'SK_GAMMA_CONTRAST=0.5',
+          ],
+        }],
+        ['OS == "mac"', {
+          'defines': [
+            'SK_GAMMA_SRGB',
+            'SK_GAMMA_CONTRAST=0.0',
+          ],
+        }],
+        
         # For POSIX platforms, prefer the Mutex implementation provided by Skia
         # since it does not generate static initializers.
         [ 'OS == "android" or OS == "linux" or OS == "mac"', {
           'defines+': [
             'SK_USE_POSIX_THREADS',
           ],
           'sources!': [
             'ext/SkThread_chrome.cc',
           ],
         }],
@@ skipping 467 matching lines @@
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'ext/image_operations_bench.cc',
       ],
     },
   ],
 }