Reland: Add ETC1 powered SSE encoder for tile texture compression

cc/resources/texture_compressor_perftest.cc

Index: cc/resources/texture_compressor_perftest.cc
diff --git a/cc/resources/texture_compressor_perftest.cc b/cc/resources/texture_compressor_perftest.cc
index 7d68bd6f5f3d9415e2d14de53de87fd4f860935f..f87fdb89d9054eeaf1f6cbb645527ef0b84e556f 100644
--- a/cc/resources/texture_compressor_perftest.cc
+++ b/cc/resources/texture_compressor_perftest.cc
@@ -17,7 +17,8 @@ const int kTimeCheckInterval = 10;
 
 const int kImageWidth = 256;
 const int kImageHeight = 256;
-const int kImageSizeInBytes = kImageWidth * kImageHeight * 4;
+const int kImageChannels = 4;
+const int kImageSizeInBytes = kImageWidth * kImageHeight * kImageChannels;
 
 const TextureCompressor::Quality kQualities[] = {
     TextureCompressor::kQualityLow,
@@ -80,19 +81,36 @@ class TextureCompressorPerfTest
   uint8_t dst_[kImageSizeInBytes];
 };
 
-TEST_P(TextureCompressorPerfTest, Compress256x256Image) {
+TEST_P(TextureCompressorPerfTest, Compress256x256BlackAndWhiteGradientImage) {
   for (int i = 0; i < kImageSizeInBytes; ++i)
     src_[i] = i % 256;
 
   for (auto& quality : kQualities)

[reveman, 2015/05/06 18:44:03]

While touching this file, do you mind removing all these quality loops in favor
of using this as test parameters:

::testing::Combine(::testing::Values(TextureCompressor::kQualityLow,
                                     TextureCompressor::kQualityMedium,
                                     TextureCompressor::kQualityHigh),
                   ::testing::Values(TextureCompressor::kFormatETC1))

[radu.velea, 2015/05/07 11:21:41]

Done.

-    RunTest("Image", quality);
+    RunTest("BlackAndWhiteGradientImage", quality);
 }
 
-TEST_P(TextureCompressorPerfTest, Compress256x256SolidImage) {
+TEST_P(TextureCompressorPerfTest, Compress256x256SolidBlackImage) {
   memset(src_, 0, kImageSizeInBytes);
 
   for (auto& quality : kQualities)
-    RunTest("SolidImage", quality);
+    RunTest("SolidBlackImage", quality);
+}
+
+TEST_P(TextureCompressorPerfTest, Compress256x256SolidColorImage) {
+  for (int i = 0; i < kImageSizeInBytes; ++i)
+    src_[i] = (4 - i % 4) * 50;
+
+  for (auto& quality : kQualities)
+    RunTest("SolidColorImage", quality);
+}
+
+TEST_P(TextureCompressorPerfTest, Compress256x256RandomColorImage) {
+  unsigned int kImageSeed = 1234567890;
+  for (int i = 0; i < kImageSizeInBytes; ++i)
+    src_[i] = rand_r(&kImageSeed) % 256;
+
+  for (auto& quality : kQualities)
+    RunTest("RandomColorImage", quality);
 }
 
 INSTANTIATE_TEST_CASE_P(TextureCompressorPerfTests,