root/content/renderer/paint_aggregator_unittest.cc

DEFINITIONS

1. TEST
2. TEST
3. TEST
4. TEST
5. TEST
6. TEST
7. TEST
8. TEST
9. TEST
10. TEST
11. TEST
12. TEST
13. TEST
14. TEST
15. TEST
16. TEST
17. TEST
18. TEST
19. TEST
20. TEST
21. TEST

// 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 "content/renderer/paint_aggregator.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace content {

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());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  ASSERT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(rect, update.paint_rects[0]);
}

TEST(PaintAggregator, DoubleDisjointInvalidation) {
  PaintAggregator greg;

  gfx::Rect r1(2, 4, 2, 40);
  gfx::Rect r2(4, 2, 40, 2);

  greg.InvalidateRect(r1);
  greg.InvalidateRect(r2);

  gfx::Rect expected_bounds = gfx::UnionRects(r1, r2);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(2U, update.paint_rects.size());

  EXPECT_EQ(expected_bounds, update.GetPaintBounds());
}

TEST(PaintAggregator, DisjointInvalidationsCombined) {
  PaintAggregator greg;

  // Make the rectangles such that they don't overlap but cover a very large
  // percentage of the area of covered by their union. This is so we're not
  // very sensitive to the combining heuristic in the paint aggregator.
  gfx::Rect r1(2, 4, 2, 1000);
  gfx::Rect r2(5, 2, 2, 1000);

  greg.InvalidateRect(r1);
  greg.InvalidateRect(r2);

  gfx::Rect expected_bounds = gfx::UnionRects(r1, r2);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  ASSERT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(expected_bounds, update.paint_rects[0]);
}

TEST(PaintAggregator, SingleScroll) {
  PaintAggregator greg;

  gfx::Rect rect(1, 2, 3, 4);
  gfx::Vector2d delta(1, 0);
  greg.ScrollRect(delta, rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.paint_rects.empty());
  EXPECT_FALSE(update.scroll_rect.IsEmpty());

  EXPECT_EQ(rect, update.scroll_rect);

  EXPECT_EQ(delta.x(), update.scroll_delta.x());
  EXPECT_EQ(delta.y(), update.scroll_delta.y());

  gfx::Rect resulting_damage = update.GetScrollDamage();
  gfx::Rect expected_damage(1, 2, 1, 4);
  EXPECT_EQ(expected_damage, resulting_damage);
}

TEST(PaintAggregator, DoubleOverlappingScroll) {
  PaintAggregator greg;

  gfx::Rect rect(1, 2, 3, 4);
  gfx::Vector2d delta1(1, 0);
  gfx::Vector2d delta2(1, 0);
  greg.ScrollRect(delta1, rect);
  greg.ScrollRect(delta2, rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.paint_rects.empty());
  EXPECT_FALSE(update.scroll_rect.IsEmpty());

  EXPECT_EQ(rect, update.scroll_rect);

  gfx::Vector2d expected_delta = delta1 + delta2;
  EXPECT_EQ(expected_delta.ToString(), update.scroll_delta.ToString());

  gfx::Rect resulting_damage = update.GetScrollDamage();
  gfx::Rect expected_damage(1, 2, 2, 4);
  EXPECT_EQ(expected_damage, resulting_damage);
}

TEST(PaintAggregator, NegatingScroll) {
  PaintAggregator greg;

  // Scroll twice in opposite directions by equal amounts.  The result
  // should be no scrolling.

  gfx::Rect rect(1, 2, 3, 4);
  gfx::Vector2d delta1(1, 0);
  gfx::Vector2d delta2(-1, 0);
  greg.ScrollRect(delta1, rect);
  greg.ScrollRect(delta2, rect);

  EXPECT_FALSE(greg.HasPendingUpdate());
}

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::Vector2d delta(1, 1);
  greg.ScrollRect(delta, rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  ASSERT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(rect, update.paint_rects[0]);
}

TEST(PaintAggregator, ContainedPaintAfterScroll) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  gfx::Rect paint_rect(4, 4, 2, 2);
  greg.InvalidateRect(paint_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  // expecting a paint rect inside the scroll rect
  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(scroll_rect, update.scroll_rect);
  EXPECT_EQ(paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, ContainedPaintBeforeScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(4, 4, 2, 2);
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  // Expecting a paint rect inside the scroll rect
  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  paint_rect.Offset(2, 0);

  EXPECT_EQ(scroll_rect, update.scroll_rect);
  EXPECT_EQ(paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, ContainedPaintsBeforeAndAfterScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect1(4, 4, 2, 2);
  greg.InvalidateRect(paint_rect1);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  gfx::Rect paint_rect2(6, 4, 2, 2);
  greg.InvalidateRect(paint_rect2);

  gfx::Rect expected_paint_rect = paint_rect2;

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  // Expecting a paint rect inside the scroll rect
  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(scroll_rect, update.scroll_rect);
  EXPECT_EQ(expected_paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, LargeContainedPaintAfterScroll) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(0, 1), scroll_rect);

  gfx::Rect paint_rect(0, 0, 10, 9);  // Repaint 90%
  greg.InvalidateRect(paint_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(scroll_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, LargeContainedPaintBeforeScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(0, 0, 10, 9);  // Repaint 90%
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(0, 1), scroll_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(scroll_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, OverlappingPaintBeforeScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(4, 4, 10, 2);
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  gfx::Rect expected_paint_rect = gfx::UnionRects(scroll_rect, paint_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(expected_paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, OverlappingPaintAfterScroll) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  gfx::Rect paint_rect(4, 4, 10, 2);
  greg.InvalidateRect(paint_rect);

  gfx::Rect expected_paint_rect = gfx::UnionRects(scroll_rect, paint_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_TRUE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(expected_paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, DisjointPaintBeforeScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(4, 4, 10, 2);
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 2, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(paint_rect, update.paint_rects[0]);
  EXPECT_EQ(scroll_rect, update.scroll_rect);
}

TEST(PaintAggregator, DisjointPaintAfterScroll) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 2, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  gfx::Rect paint_rect(4, 4, 10, 2);
  greg.InvalidateRect(paint_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(paint_rect, update.paint_rects[0]);
  EXPECT_EQ(scroll_rect, update.scroll_rect);
}

TEST(PaintAggregator, ContainedPaintTrimmedByScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(4, 4, 6, 6);
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(2, 0), scroll_rect);

  // The paint rect should have become narrower.
  gfx::Rect expected_paint_rect(6, 4, 4, 6);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(expected_paint_rect, update.paint_rects[0]);
  EXPECT_EQ(scroll_rect, update.scroll_rect);
}

TEST(PaintAggregator, ContainedPaintEliminatedByScroll) {
  PaintAggregator greg;

  gfx::Rect paint_rect(4, 4, 6, 6);
  greg.InvalidateRect(paint_rect);

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(6, 0), scroll_rect);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_TRUE(update.paint_rects.empty());

  EXPECT_EQ(scroll_rect, update.scroll_rect);
}

TEST(PaintAggregator, ContainedPaintAfterScrollTrimmedByScrollDamage) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(4, 0), scroll_rect);

  gfx::Rect paint_rect(2, 0, 4, 10);
  greg.InvalidateRect(paint_rect);

  gfx::Rect expected_scroll_damage(0, 0, 4, 10);
  gfx::Rect expected_paint_rect(4, 0, 2, 10);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_EQ(1U, update.paint_rects.size());

  EXPECT_EQ(scroll_rect, update.scroll_rect);
  EXPECT_EQ(expected_scroll_damage, update.GetScrollDamage());
  EXPECT_EQ(expected_paint_rect, update.paint_rects[0]);
}

TEST(PaintAggregator, ContainedPaintAfterScrollEliminatedByScrollDamage) {
  PaintAggregator greg;

  gfx::Rect scroll_rect(0, 0, 10, 10);
  greg.ScrollRect(gfx::Vector2d(4, 0), scroll_rect);

  gfx::Rect paint_rect(2, 0, 2, 10);
  greg.InvalidateRect(paint_rect);

  gfx::Rect expected_scroll_damage(0, 0, 4, 10);

  EXPECT_TRUE(greg.HasPendingUpdate());
  PaintAggregator::PendingUpdate update;
  greg.PopPendingUpdate(&update);

  EXPECT_FALSE(update.scroll_rect.IsEmpty());
  EXPECT_TRUE(update.paint_rects.empty());

  EXPECT_EQ(scroll_rect, update.scroll_rect);
  EXPECT_EQ(expected_scroll_damage, update.GetScrollDamage());
}

}  // namespace content