cc/layers/painted_scrollbar_layer_impl_unittest.cc

   1 // Copyright 2014 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/layers/painted_scrollbar_layer_impl.h"
   6
   7 #include "cc/quads/draw_quad.h"
   8 #include "cc/test/layer_test_common.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace cc {
  12 namespace {
  13
  14 TEST(PaintedScrollbarLayerImplTest, Occlusion) {
  15   gfx::Size layer_size(10, 1000);
  16   float scale = 2.f;
  17   gfx::Size scaled_layer_size(20, 2000);
  18   gfx::Size viewport_size(1000, 1000);
  19
  20   LayerTestCommon::LayerImplTest impl;
  21
  22   SkBitmap thumb_sk_bitmap;
  23   thumb_sk_bitmap.allocN32Pixels(10, 10);
  24   thumb_sk_bitmap.setImmutable();
  25   UIResourceId thumb_uid = 5;
  26   UIResourceBitmap thumb_bitmap(thumb_sk_bitmap);
  27   impl.host_impl()->CreateUIResource(thumb_uid, thumb_bitmap);
  28
  29   SkBitmap track_sk_bitmap;
  30   track_sk_bitmap.allocN32Pixels(10, 10);
  31   track_sk_bitmap.setImmutable();
  32   UIResourceId track_uid = 6;
  33   UIResourceBitmap track_bitmap(track_sk_bitmap);
  34   impl.host_impl()->CreateUIResource(track_uid, track_bitmap);
  35
  36   ScrollbarOrientation orientation = VERTICAL;
  37
  38   PaintedScrollbarLayerImpl* scrollbar_layer_impl =
  39       impl.AddChildToRoot<PaintedScrollbarLayerImpl>(orientation);
  40   scrollbar_layer_impl->SetBounds(layer_size);
  41   scrollbar_layer_impl->SetContentsOpaque(true);
  42   scrollbar_layer_impl->set_internal_contents_scale_and_bounds(
  43       scale, scaled_layer_size);
  44   scrollbar_layer_impl->SetDrawsContent(true);
  45   scrollbar_layer_impl->SetThumbThickness(layer_size.width());
  46   scrollbar_layer_impl->SetThumbLength(500);
  47   scrollbar_layer_impl->SetTrackLength(layer_size.height());
  48   scrollbar_layer_impl->SetCurrentPos(100.f / 4);
  49   scrollbar_layer_impl->SetMaximum(100);
  50   scrollbar_layer_impl->SetVisibleToTotalLengthRatio(1.f / 2);
  51   scrollbar_layer_impl->set_track_ui_resource_id(track_uid);
  52   scrollbar_layer_impl->set_thumb_ui_resource_id(thumb_uid);
  53
  54   impl.CalcDrawProps(viewport_size);
  55
  56   gfx::Rect thumb_rect = scrollbar_layer_impl->ComputeThumbQuadRect();
  57   EXPECT_EQ(gfx::Rect(0, 500 / 4, 10, layer_size.height() / 2).ToString(),
  58             thumb_rect.ToString());
  59
  60   {
  61     SCOPED_TRACE("No occlusion");
  62     gfx::Rect occluded;
  63     impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
  64
  65     size_t partially_occluded_count = 0;
  66     LayerTestCommon::VerifyQuadsAreOccluded(
  67         impl.quad_list(), occluded, &partially_occluded_count);
  68     EXPECT_EQ(2u, impl.quad_list().size());
  69     EXPECT_EQ(0u, partially_occluded_count);
  70
  71     // Note: this is also testing that the thumb and track are both
  72     // scaled by the internal contents scale.  It's not occlusion-related
  73     // but is easy to verify here.
  74     const DrawQuad* thumb_quad = impl.quad_list().ElementAt(0);
  75     const DrawQuad* track_quad = impl.quad_list().ElementAt(1);
  76
  77     gfx::Rect scaled_thumb_rect = gfx::ScaleToEnclosingRect(thumb_rect, scale);
  78     EXPECT_EQ(track_quad->rect.ToString(),
  79               gfx::Rect(scaled_layer_size).ToString());
  80     EXPECT_EQ(track_quad->opaque_rect.ToString(),
  81               gfx::Rect(scaled_layer_size).ToString());
  82     EXPECT_EQ(track_quad->visible_rect.ToString(),
  83               gfx::Rect(scaled_layer_size).ToString());
  84     EXPECT_EQ(thumb_quad->rect.ToString(), scaled_thumb_rect.ToString());
  85     EXPECT_EQ(thumb_quad->visible_rect.ToString(),
  86               scaled_thumb_rect.ToString());
  87   }
  88
  89   {
  90     SCOPED_TRACE("Full occlusion");
  91     gfx::Rect occluded(scrollbar_layer_impl->visible_layer_rect());
  92     impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
  93
  94     LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
  95     EXPECT_EQ(impl.quad_list().size(), 0u);
  96   }
  97
  98   {
  99     SCOPED_TRACE("Partial occlusion");
 100     gfx::Rect occluded(0, 0, 5, 1000);
 101     impl.AppendQuadsWithOcclusion(scrollbar_layer_impl, occluded);
 102
 103     size_t partially_occluded_count = 0;
 104     LayerTestCommon::VerifyQuadsAreOccluded(
 105         impl.quad_list(), occluded, &partially_occluded_count);
 106     // The layer outputs two quads, which is partially occluded.
 107     EXPECT_EQ(2u, impl.quad_list().size());
 108     EXPECT_EQ(2u, partially_occluded_count);
 109   }
 110 }
 111
 112 }  // namespace
 113 }  // namespace cc