Revert "gbr- has been brg- this whole time..."

This reverts commit 5b9a037bf41591e0076843f619ee47c9ad30e42d.

Reason for revert: 

I got confused in here somewhere and everything is drawing wrong.

Original change's description:
> gbr- has been brg- this whole time...
> 
> Rewrite things to make that a little clearer.
> 
> A red pixel ends up in channel 2, what would naively draw as blue
> without a rotation.  A green pixel ends up in channel 0, which would
> naively draw as red without rotation.  A blue pixel ends up in channel
> 1, which would naively draw as green without this rotation.
> 
> So this transformation is:
> 
>    r -> b
>    g -> r
>    b -> g
> 
> i.e. rgb_to_brg
> 
> Change-Id: I12331ff2622194e34a44f421f656fbe4db5d3dca
> Reviewed-on: https://skia-review.googlesource.com/65521
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=mtklein@chromium.org,brianosman@google.com

Change-Id: Ib29800b242bf736b20d61375d3c437c8f4ffdce0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/65781
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 13 insertions, 9 deletions

diff --git a/dm/DM.cpp b/dm/DM.cpp
index ce4eb367fd..cb5332d77a 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -912,22 +912,26 @@ static sk_sp<SkColorSpace> adobe_rgb() {
                                  SkColorSpace::kAdobeRGB_Gamut);
 }
 
-static sk_sp<SkColorSpace> rgb_to_brg() {
-    auto m = gSRGB_toXYZD50;
-    float brg[9] = {
-        m[1], m[2], m[0],
-        m[4], m[5], m[3],
-        m[7], m[8], m[6],
-    };
+static sk_sp<SkColorSpace> rgb_to_gbr() {
+    float gbr[9];
+    gbr[0] = gSRGB_toXYZD50[1];
+    gbr[1] = gSRGB_toXYZD50[2];
+    gbr[2] = gSRGB_toXYZD50[0];
+    gbr[3] = gSRGB_toXYZD50[4];
+    gbr[4] = gSRGB_toXYZD50[5];
+    gbr[5] = gSRGB_toXYZD50[3];
+    gbr[6] = gSRGB_toXYZD50[7];
+    gbr[7] = gSRGB_toXYZD50[8];
+    gbr[8] = gSRGB_toXYZD50[6];
     SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor);
-    toXYZD50.set3x3RowMajorf(brg);
+    toXYZD50.set3x3RowMajorf(gbr);
     return SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, toXYZD50);
 }
 
 static Sink* create_via(const SkString& tag, Sink* wrapped) {
 #define VIA(t, via, ...) if (tag.equals(t)) { return new via(__VA_ARGS__); }
     VIA("adobe",     ViaCSXform,           wrapped, adobe_rgb(), false);
-    VIA("brg",       ViaCSXform,           wrapped, rgb_to_brg(), true);
+    VIA("gbr",       ViaCSXform,           wrapped, rgb_to_gbr(), true);
     VIA("lite",      ViaLite,              wrapped);
     VIA("pipe",      ViaPipe,              wrapped);
     VIA("twice",     ViaTwice,             wrapped);