[3/5] Add translated rasterization support for RasterBuffer & below

ui/gfx/geometry/axis_transform2d_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 "ui/gfx/geometry/axis_transform2d.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/test/gfx_util.h"
+
+namespace gfx {
+namespace {
+
+TEST(AxisTransform2dTest, Mapping) {
+  AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+
+  PointF p(150.f, 100.f);
+  EXPECT_EQ(PointF(191.25f, 180.f), t.MapPoint(p));
+  EXPECT_POINTF_EQ(PointF(117.f, 36.f), t.InverseMapPoint(p));
+
+  RectF r(150.f, 100.f, 22.5f, 37.5f);
+  EXPECT_EQ(RectF(191.25f, 180.f, 28.125f, 46.875f), t.MapRect(r));
+  EXPECT_RECTF_EQ(RectF(117.f, 36.f, 18.f, 30.f), t.InverseMapRect(r));
+}
+
+TEST(AxisTransform2dTest, Scaling) {
+  {
+    AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+    EXPECT_EQ(AxisTransform2d(1.5625f, Vector2dF(3.75f, 55.f)),
+              PreScaleAxisTransform2d(t, 1.25));
+    t.PreScale(1.25);
+    EXPECT_EQ(AxisTransform2d(1.5625f, Vector2dF(3.75f, 55.f)), t);
+  }
+
+  {
+    AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+    EXPECT_EQ(AxisTransform2d(1.5625f, Vector2dF(4.6875f, 68.75f)),
+              PostScaleAxisTransform2d(t, 1.25));
+    t.PostScale(1.25);
+    EXPECT_EQ(AxisTransform2d(1.5625f, Vector2dF(4.6875f, 68.75f)), t);
+  }
+}
+
+TEST(AxisTransform2dTest, Translating) {
+  Vector2dF tr(3.f, -5.f);
+  {
+    AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+    EXPECT_EQ(AxisTransform2d(1.25f, Vector2dF(7.5f, 48.75f)),
+              PreTranslateAxisTransform2d(t, tr));
+    t.PreTranslate(tr);
+    EXPECT_EQ(AxisTransform2d(1.25f, Vector2dF(7.5f, 48.75f)), t);
+  }
+
+  {
+    AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+    EXPECT_EQ(AxisTransform2d(1.25f, Vector2dF(6.75f, 50.f)),
+              PostTranslateAxisTransform2d(t, tr));
+    t.PostTranslate(tr);
+    EXPECT_EQ(AxisTransform2d(1.25f, Vector2dF(6.75f, 50.f)), t);
+  }
+}
+
+TEST(AxisTransform2dTest, Concat) {
+  AxisTransform2d pre(1.25f, Vector2dF(3.75f, 55.f));
+  AxisTransform2d post(0.5f, Vector2dF(10.f, 5.f));
+  AxisTransform2d expectation(0.625f, Vector2dF(11.875f, 32.5f));
+  EXPECT_EQ(expectation, ConcatAxisTransform2d(post, pre));
+
+  AxisTransform2d post_concat = pre;
+  post_concat.PostConcat(post);
+  EXPECT_EQ(expectation, post_concat);
+
+  AxisTransform2d pre_concat = post;
+  pre_concat.PreConcat(pre);
+  EXPECT_EQ(expectation, pre_concat);
+}
+
+TEST(AxisTransform2dTest, Inverse) {
+  AxisTransform2d t(1.25f, Vector2dF(3.75f, 55.f));
+  AxisTransform2d inv_inplace = t;
+  inv_inplace.Invert();
+  AxisTransform2d inv_out_of_place = InvertAxisTransform2d(t);
+
+  EXPECT_AXIS_TRANSFORM2D_EQ(inv_inplace, inv_out_of_place);
+  EXPECT_AXIS_TRANSFORM2D_EQ(AxisTransform2d(),
+                             ConcatAxisTransform2d(t, inv_inplace));
+  EXPECT_AXIS_TRANSFORM2D_EQ(AxisTransform2d(),
+                             ConcatAxisTransform2d(inv_inplace, t));
+}
+
+}  // namespace
+}  // namespace gfx