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(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 cc::QuadList& quads,
  36                                                   gfx::Rect rect) {
  37   cc::Region remaining = rect;
  38
  39   for (size_t i = 0; i < quads.size(); ++i) {
  40     cc::DrawQuad* quad = quads[i];
  41     gfx::RectF quad_rectf =
  42         cc::MathUtil::MapClippedRect(quad->quadTransform(),
  43                                      gfx::RectF(quad->rect));
  44
  45     // Before testing for exact coverage in the integer world, assert that
  46     // rounding will not round the rect incorrectly.
  47     ASSERT_TRUE(CanRectFBeSafelyRoundedToRect(quad_rectf));
  48
  49     gfx::Rect quad_rect = gfx::ToEnclosingRect(quad_rectf);
  50
  51     EXPECT_TRUE(rect.Contains(quad_rect)) << quad_string << i;
  52     EXPECT_TRUE(remaining.Contains(quad_rect)) << quad_string << i;
  53     remaining.Subtract(quad_rect);
  54   }
  55
  56   EXPECT_TRUE(remaining.IsEmpty());
  57 }
  58
  59 }  // namespace cc