Reland: Add ETC1 powered SSE encoder for tile texture compression

cc/cc.gyp

Index: cc/cc.gyp
diff --git a/cc/cc.gyp b/cc/cc.gyp
index aeea01861d2ddf3def9fef729e6beab473b21f60..0c4ff2e680b7350f96afaef20856e0e249b30509 100644
--- a/cc/cc.gyp
+++ b/cc/cc.gyp
@@ -487,6 +487,8 @@
         'resources/texture_compressor.h',
         'resources/texture_compressor_etc1.cc',
         'resources/texture_compressor_etc1.h',
+        'resources/texture_compressor_etc1_sse.cc',
+        'resources/texture_compressor_etc1_sse.h',

[robert.bradford, 2015/04/17 14:04:47]

You also need to add entries to the BUILD.gn file too.

[radu.velea, 2015/04/17 16:02:32]

Done.

[radu.velea, 2015/04/17 16:02:32]

Done.

         'resources/texture_mailbox.cc',
         'resources/texture_mailbox.h',
         'resources/texture_mailbox_deleter.cc',
@@ -579,6 +581,9 @@
         'trees/tree_synchronizer.cc',
         'trees/tree_synchronizer.h',
       ],
+      'cflags': [
+        '-msse4.1',

[robert.bradford, 2015/04/17 14:04:47]

You can't do this as this allows the compiler to use optimisations that generate
SSE4.1 instructions for this whole compilation block which might not be
supported by the platform the code runs on.

[radu.velea, 2015/04/17 16:02:32]

Done.

+      ],
       'includes': [
         '../build/android/increase_size_for_speed.gypi',
       ],