cc/test/layer_test_common.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/test/layer_test_common.h"
   6
   7 #include "cc/base/math_util.h"
   8 #include "cc/base/region.h"
   9 #include "cc/quads/draw_quad.h"
  10 #include "cc/quads/render_pass.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12 #include "ui/gfx/point_conversions.h"
  13 #include "ui/gfx/rect.h"
  14 #include "ui/gfx/rect_conversions.h"
  15 #include "ui/gfx/size_conversions.h"
  16
  17 namespace cc {
  18
  19 // Align with expected and actual output.
  20 const char* LayerTestCommon::quad_string = "    Quad: ";
  21
  22 static bool CanRectFBeSafelyRoundedToRect(const gfx::RectF& r) {
  23   // Ensure that range of float values is not beyond integer range.
  24   if (!r.IsExpressibleAsRect())
  25     return false;
  26
  27   // Ensure that the values are actually integers.
  28   if (gfx::ToFlooredPoint(r.origin()) == r.origin() &&
  29       gfx::ToFlooredSize(r.size()) == r.size())
  30     return true;
  31
  32   return false;
  33 }
  34
  35 void LayerTestCommon::VerifyQuadsExactlyCoverRect(const QuadList& quads,
  36                                                   const gfx::Rect& rect) {
  37   Region remaining = rect;
  38
  39   for (size_t i = 0; i < quads.size(); ++i) {
  40     DrawQuad* quad = quads[i];
  41     gfx::RectF quad_rectf =
  42         MathUtil::MapClippedRect(quad->quadTransform(), gfx::RectF(quad->rect));
  43
  44     // Before testing for exact coverage in the integer world, assert that
  45     // rounding will not round the rect incorrectly.
  46     ASSERT_TRUE(CanRectFBeSafelyRoundedToRect(quad_rectf));
  47
  48     gfx::Rect quad_rect = gfx::ToEnclosingRect(quad_rectf);
  49
  50     EXPECT_TRUE(rect.Contains(quad_rect)) << quad_string << i;
  51     EXPECT_TRUE(remaining.Contains(quad_rect)) << quad_string << i;
  52     remaining.Subtract(quad_rect);
  53   }
  54
  55   EXPECT_TRUE(remaining.IsEmpty());
  56 }
  57
  58 // static
  59 void LayerTestCommon::VerifyQuadsCoverRectWithOcclusion(
  60     const QuadList& quads,
  61     const gfx::Rect& rect,
  62     const gfx::Rect& occluded,
  63     size_t* partially_occluded_count) {
  64   // No quad should exist if it's fully occluded.
  65   for (size_t i = 0; i < quads.size(); ++i) {
  66     EXPECT_FALSE(occluded.Contains(quads[i]->visible_rect));
  67   }
  68
  69   // Quads that are fully occluded on one axis only should be shrunken.
  70   for (size_t i = 0; i < quads.size(); ++i) {
  71     DrawQuad* quad = quads[i];
  72     bool fully_occluded_horizontal = quad->rect.x() >= occluded.x() &&
  73                                      quad->rect.right() <= occluded.right();
  74     bool fully_occluded_vertical = quad->rect.y() >= occluded.y() &&
  75                                    quad->rect.bottom() <= occluded.bottom();
  76     bool should_be_occluded =
  77         quad->rect.Intersects(occluded) &&
  78         (fully_occluded_vertical || fully_occluded_horizontal);
  79     if (!should_be_occluded) {
  80       EXPECT_EQ(quad->rect.ToString(), quad->visible_rect.ToString());
  81     } else {
  82       EXPECT_NE(quad->rect.ToString(), quad->visible_rect.ToString());
  83       EXPECT_TRUE(quad->rect.Contains(quad->visible_rect));
  84       ++(*partially_occluded_count);
  85     }
  86   }
  87 }
  88
  89 LayerTestCommon::LayerImplTest::LayerImplTest()
  90     : host_(FakeLayerTreeHost::Create()),
  91       root_layer_impl_(
  92           LayerImpl::Create(host_->host_impl()->active_tree(), 1)) {}
  93
  94 LayerTestCommon::LayerImplTest::~LayerImplTest() {}
  95
  96 }  // namespace cc