blob: 6a7149627473f8e376d9fe8d45d64c15475136c9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
// Copyright 2014 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 "cc/trees/occlusion.h"
#include "cc/base/math_util.h"
#include "ui/gfx/geometry/rect.h"
namespace cc {
Occlusion::Occlusion() {
}
Occlusion::Occlusion(const gfx::Transform& draw_transform,
const SimpleEnclosedRegion& occlusion_from_outside_target,
const SimpleEnclosedRegion& occlusion_from_inside_target)
: draw_transform_(draw_transform),
occlusion_from_outside_target_(occlusion_from_outside_target),
occlusion_from_inside_target_(occlusion_from_inside_target) {
}
Occlusion Occlusion::GetOcclusionWithGivenDrawTransform(
const gfx::Transform& transform) const {
return Occlusion(
transform, occlusion_from_outside_target_, occlusion_from_inside_target_);
}
bool Occlusion::HasOcclusion() const {
return !occlusion_from_inside_target_.IsEmpty() ||
!occlusion_from_outside_target_.IsEmpty();
}
bool Occlusion::IsOccluded(const gfx::Rect& content_rect) const {
if (content_rect.IsEmpty())
return true;
if (!HasOcclusion())
return false;
gfx::Rect unoccluded_rect_in_target_surface =
GetUnoccludedRectInTargetSurface(content_rect);
return unoccluded_rect_in_target_surface.IsEmpty();
}
gfx::Rect Occlusion::GetUnoccludedContentRect(
const gfx::Rect& content_rect) const {
if (content_rect.IsEmpty())
return content_rect;
if (!HasOcclusion())
return content_rect;
gfx::Rect unoccluded_rect_in_target_surface =
GetUnoccludedRectInTargetSurface(content_rect);
if (unoccluded_rect_in_target_surface.IsEmpty())
return gfx::Rect();
gfx::Transform inverse_draw_transform(gfx::Transform::kSkipInitialization);
bool ok = draw_transform_.GetInverse(&inverse_draw_transform);
DCHECK(ok);
gfx::Rect unoccluded_rect = MathUtil::ProjectEnclosingClippedRect(
inverse_draw_transform, unoccluded_rect_in_target_surface);
unoccluded_rect.Intersect(content_rect);
return unoccluded_rect;
}
gfx::Rect Occlusion::GetUnoccludedRectInTargetSurface(
const gfx::Rect& content_rect) const {
// Take the ToEnclosingRect at each step, as we want to contain any unoccluded
// partial pixels in the resulting Rect.
gfx::Rect unoccluded_rect_in_target_surface =
MathUtil::MapEnclosingClippedRect(draw_transform_, content_rect);
DCHECK_LE(occlusion_from_inside_target_.GetRegionComplexity(), 1u);
DCHECK_LE(occlusion_from_outside_target_.GetRegionComplexity(), 1u);
// These subtract operations are more lossy than if we did both operations at
// once.
unoccluded_rect_in_target_surface.Subtract(
occlusion_from_inside_target_.bounds());
unoccluded_rect_in_target_surface.Subtract(
occlusion_from_outside_target_.bounds());
return unoccluded_rect_in_target_surface;
}
bool Occlusion::IsEqual(const Occlusion& other) const {
return draw_transform_ == other.draw_transform_ &&
occlusion_from_inside_target_ == other.occlusion_from_inside_target_ &&
occlusion_from_outside_target_ == other.occlusion_from_outside_target_;
}
std::string Occlusion::ToString() const {
return draw_transform_.ToString() + "outside(" +
occlusion_from_outside_target_.ToString() + ") inside(" +
occlusion_from_inside_target_.ToString() + ")";
}
} // namespace cc
|
