SkScaledCodec class

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 9dcdff1a0fce6f98f10228d33595e618a31f4c2e..27fe052c29a816333205a8d74ade1a8d0e87c8fd 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -212,7 +212,8 @@ static void push_codec_srcs(Path path) {
     // TODO (msarett): Add more scaling tests as we implement more flexible scaling.
     // TODO (msarett): Implement scaling tests for SkImageDecoder in order to compare with these
     //                 tests.  SkImageDecoder supports downscales by integer factors.
-    const float scales[] = { 0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.750f, 0.875f, 1.0f };
+    const float scales[] = { 0.1f, 0.125f, 0.16666666f, 0.2f, 0.25f, 0.3f, 0.375f, 0.4f, 0.5f, 0.6f,

[scroggo, 2015/08/04 20:05:21]

Could you add comments explaining why we chose these particular scale values?

[emmaleer, 2015/08/05 14:47:51]

Before we were only testing scaled values that Jpeg natively supports. 
I wanted to test values that it didn't natively support, to test the partial
scaling. 
I think it's good to leave them, so we test the sampling functionality for jpeg
and don't always use the native scaling method.  

+                             0.625f, 0.7f, 0.750f, 0.8f, 0.875f, 0.9f, 1.0f };
 
     for (float scale : scales) {
         if (scale != 1.0f && (path.endsWith(".webp") || path.endsWith(".WEBP"))) {