Refactors RenderWidget to extract a PaintAggregator class....

chrome/renderer/paint_aggregator_unittest.cc

+// Copyright (c) 2009 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 "chrome/renderer/paint_aggregator.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(PaintAggregator, InitialState) {
+  PaintAggregator greg;
+  EXPECT_FALSE(greg.HasPendingUpdate());
+}
+
+TEST(PaintAggregator, SingleInvalidation) {
+  PaintAggregator greg;
+
+  gfx::Rect rect(2, 4, 10, 16);
+  greg.InvalidateRect(rect);
+
+  EXPECT_TRUE(greg.HasPendingUpdate());
+  EXPECT_TRUE(greg.GetPendingUpdate().scroll_rect.IsEmpty());
+  EXPECT_FALSE(greg.GetPendingUpdate().paint_rect.IsEmpty());
+
+  EXPECT_EQ(rect.x(), greg.GetPendingUpdate().paint_rect.x());
+  EXPECT_EQ(rect.y(), greg.GetPendingUpdate().paint_rect.y());
+  EXPECT_EQ(rect.width(), greg.GetPendingUpdate().paint_rect.width());
+  EXPECT_EQ(rect.height(), greg.GetPendingUpdate().paint_rect.height());
+}
+
+TEST(PaintAggregator, DoubleDisjointInvalidation) {
+  PaintAggregator greg;
+
+  gfx::Rect r1(2, 4, 2, 4);
+  gfx::Rect r2(4, 2, 4, 2);
+
+  greg.InvalidateRect(r1);
+  greg.InvalidateRect(r2);
+
+  gfx::Rect expected = r1.Union(r2);
+
+  EXPECT_TRUE(greg.HasPendingUpdate());
+  EXPECT_TRUE(greg.GetPendingUpdate().scroll_rect.IsEmpty());
+  EXPECT_FALSE(greg.GetPendingUpdate().paint_rect.IsEmpty());
+
+  EXPECT_EQ(expected.x(), greg.GetPendingUpdate().paint_rect.x());
+  EXPECT_EQ(expected.y(), greg.GetPendingUpdate().paint_rect.y());
+  EXPECT_EQ(expected.width(), greg.GetPendingUpdate().paint_rect.width());
+  EXPECT_EQ(expected.height(), greg.GetPendingUpdate().paint_rect.height());
+}
+
+TEST(PaintAggregator, SingleScroll) {
+  PaintAggregator greg;
+
+  gfx::Rect rect(1, 2, 3, 4);
+  gfx::Point delta(1, 0);
+  greg.ScrollRect(delta.x(), delta.y(), rect);
+
+  EXPECT_TRUE(greg.HasPendingUpdate());
+  EXPECT_TRUE(greg.GetPendingUpdate().paint_rect.IsEmpty());
+  EXPECT_FALSE(greg.GetPendingUpdate().scroll_rect.IsEmpty());
+
+  EXPECT_EQ(rect.x(), greg.GetPendingUpdate().scroll_rect.x());
+  EXPECT_EQ(rect.y(), greg.GetPendingUpdate().scroll_rect.y());
+  EXPECT_EQ(rect.width(), greg.GetPendingUpdate().scroll_rect.width());
+  EXPECT_EQ(rect.height(), greg.GetPendingUpdate().scroll_rect.height());
+
+  EXPECT_EQ(delta.x(), greg.GetPendingUpdate().scroll_delta.x());
+  EXPECT_EQ(delta.y(), greg.GetPendingUpdate().scroll_delta.y());
+
+  gfx::Rect resulting_damage = greg.GetPendingUpdate().GetScrollDamage();
+  gfx::Rect expected_damage(1, 2, 1, 4);
+  EXPECT_EQ(expected_damage.x(), resulting_damage.x());
+  EXPECT_EQ(expected_damage.y(), resulting_damage.y());
+  EXPECT_EQ(expected_damage.width(), resulting_damage.width());
+  EXPECT_EQ(expected_damage.height(), resulting_damage.height());
+}
+
+TEST(PaintAggregator, DoubleOverlappingScroll) {
+  PaintAggregator greg;
+
+  gfx::Rect rect(1, 2, 3, 4);
+  gfx::Point delta1(1, 0);
+  gfx::Point delta2(1, 0);
+  greg.ScrollRect(delta1.x(), delta1.y(), rect);
+  greg.ScrollRect(delta2.x(), delta2.y(), rect);
+
+  EXPECT_TRUE(greg.HasPendingUpdate());
+  EXPECT_TRUE(greg.GetPendingUpdate().paint_rect.IsEmpty());
+  EXPECT_FALSE(greg.GetPendingUpdate().scroll_rect.IsEmpty());
+
+  EXPECT_EQ(rect.x(), greg.GetPendingUpdate().scroll_rect.x());
+  EXPECT_EQ(rect.y(), greg.GetPendingUpdate().scroll_rect.y());
+  EXPECT_EQ(rect.width(), greg.GetPendingUpdate().scroll_rect.width());
+  EXPECT_EQ(rect.height(), greg.GetPendingUpdate().scroll_rect.height());
+
+  gfx::Point expected_delta(delta1.x() + delta2.x(),
+                            delta1.y() + delta2.y());
+  EXPECT_EQ(expected_delta.x(), greg.GetPendingUpdate().scroll_delta.x());
+  EXPECT_EQ(expected_delta.y(), greg.GetPendingUpdate().scroll_delta.y());
+
+  gfx::Rect resulting_damage = greg.GetPendingUpdate().GetScrollDamage();
+  gfx::Rect expected_damage(1, 2, 2, 4);
+  EXPECT_EQ(expected_damage.x(), resulting_damage.x());
+  EXPECT_EQ(expected_damage.y(), resulting_damage.y());
+  EXPECT_EQ(expected_damage.width(), resulting_damage.width());
+  EXPECT_EQ(expected_damage.height(), resulting_damage.height());
+}
+
+TEST(PaintAggregator, DiagonalScroll) {
+  PaintAggregator greg;
+
+  // We don't support optimized diagonal scrolling, so this should result in
+  // repainting.
+
+  gfx::Rect rect(1, 2, 3, 4);
+  gfx::Point delta(1, 1);
+  greg.ScrollRect(delta.x(), delta.y(), rect);
+
+  EXPECT_TRUE(greg.HasPendingUpdate());
+  EXPECT_TRUE(greg.GetPendingUpdate().scroll_rect.IsEmpty());
+  EXPECT_FALSE(greg.GetPendingUpdate().paint_rect.IsEmpty());
+
+  EXPECT_EQ(rect.x(), greg.GetPendingUpdate().paint_rect.x());
+  EXPECT_EQ(rect.y(), greg.GetPendingUpdate().paint_rect.y());
+  EXPECT_EQ(rect.width(), greg.GetPendingUpdate().paint_rect.width());
+  EXPECT_EQ(rect.height(), greg.GetPendingUpdate().paint_rect.height());
+}
+
+// TODO(darin): Add tests for mixed scrolling and invalidation