Add Matrix4x3 and tristimulus class to color utiliies.

ui/gfx/color_utils_unittest.cc

 // Copyright (c) 2006-2008 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.
 
 #include <stdlib.h>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColorPriv.h"
 #include "ui/gfx/canvas.h"
@@ skipping 147 matching lines @@
 
   // One is fully transparent, result is partially transparent.
   back = SkColorSetA(back, 0);
   EXPECT_EQ(136U, SkColorGetA(AlphaBlend(fore, back, 136)));
 
   // Both are fully transparent, result is fully transparent.
   fore = SkColorSetA(fore, 0);
   EXPECT_EQ(0U, SkColorGetA(AlphaBlend(fore, back, 255)));
 }
 
+TEST(ColorUtils, Matrix4x3) {
+  Matrix4x3 tmp;
+  EXPECT_EQ(tmp.lookup(3, 3), 1.0f);
+  tmp.rows[0][2] = 4.0f;
+  tmp.rows[2][1] = 8.0f;
+  Matrix4x3 copy = tmp.Invert().Invert();
+  EXPECT_EQ(tmp.rows[0][2], 4.0f);
+  EXPECT_EQ(tmp.rows[2][1], 8.0f);
+  for (int row = 0; row < 3; row++) {
+    for (int col = 0; col < 4; col++) {
+      copy.rows[row][col] = 0.0f;
+    }
+  }
+  copy = copy * tmp;
+  for (int row = 0; row < 3; row++) {
+    for (int col = 0; col < 4; col++) {
+      EXPECT_EQ(copy.lookup(row, col), 0.0f);
+    }
+  }
+
+  TriStim tmp2(1.0f, 2.0f, 3.0f);
+  tmp2 = copy * tmp2;
+  EXPECT_EQ(tmp2.values[0], 0.0f);
+  EXPECT_EQ(tmp2.values[1], 0.0f);
+  EXPECT_EQ(tmp2.values[2], 0.0f);
+}
+
 }  // namespace color_utils