Refactor GL surface format handling

ui/gl/gl_surface_format_unittest.cc

+// Copyright 2017 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 "testing/gtest/include/gtest/gtest.h"
+#include "ui/gl/gl_surface_format.h"
+
+namespace gl {
+
+TEST(GLSurfaceFormatTest, BasicTest) {
+  {
+    // Check default format properties.
+    GLSurfaceFormat format = GLSurfaceFormat();
+    EXPECT_TRUE(format.IsDefault());
+    EXPECT_EQ(32, format.GetBufferSize());
+    EXPECT_FALSE(format.IsSurfaceless());
+    EXPECT_EQ(GLSurfaceFormat::PIXEL_LAYOUT_DONT_CARE,
+              format.GetPixelLayout());
+  }
+
+  {
+    // Check rgb565 format as used for low-end Android devices.
+    GLSurfaceFormat format = GLSurfaceFormat();
+    format.SetRGB565();
+    EXPECT_FALSE(format.IsDefault());
+    EXPECT_EQ(16, format.GetBufferSize());
+  }
+
+  {
+    // Check surfaceless format.
+    GLSurfaceFormat format = GLSurfaceFormat();
+    format.SetIsSurfaceless();
+    EXPECT_FALSE(format.IsDefault());
+    EXPECT_TRUE(format.IsSurfaceless());
+  }
+
+  {
+    // Check custom pixel layout.
+    GLSurfaceFormat format = GLSurfaceFormat(
+        GLSurfaceFormat::PIXEL_LAYOUT_RGBA);
+    EXPECT_FALSE(format.IsDefault());
+    EXPECT_EQ(GLSurfaceFormat::PIXEL_LAYOUT_RGBA,
+              format.GetPixelLayout());
+
+    // The custom pixel layout should remain after other modifications.
+    format.SetDepthBits(24);
+    EXPECT_EQ(GLSurfaceFormat::PIXEL_LAYOUT_RGBA,
+              format.GetPixelLayout());
+    EXPECT_EQ(24, format.GetDepthBits());
+  }
+
+  {
+    // Check IsCompatible
+    GLSurfaceFormat format = GLSurfaceFormat();
+    EXPECT_TRUE(format.IsCompatible(GLSurfaceFormat()));
+
+    GLSurfaceFormat other = GLSurfaceFormat();
+    other.SetRGB565();
+    EXPECT_FALSE(format.IsCompatible(other));
+    EXPECT_TRUE(other.IsCompatible(other));
+  }
+}
+
+}