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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
// Copyright 2015 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/playback/pixel_ref_map.h"
#include <algorithm>
#include <limits>
#include "cc/base/math_util.h"
#include "cc/playback/display_item_list.h"
#include "cc/playback/picture.h"
#include "skia/ext/pixel_ref_utils.h"
namespace cc {
PixelRefMap::PixelRefMap(const gfx::Size& cell_size) : cell_size_(cell_size) {
DCHECK(!cell_size.IsEmpty());
}
PixelRefMap::~PixelRefMap() {
}
void PixelRefMap::GatherPixelRefsFromPicture(SkPicture* picture,
const gfx::Rect& layer_rect) {
DCHECK(picture);
int min_x = std::numeric_limits<int>::max();
int min_y = std::numeric_limits<int>::max();
int max_x = 0;
int max_y = 0;
skia::DiscardablePixelRefList pixel_refs;
skia::PixelRefUtils::GatherDiscardablePixelRefs(picture, &pixel_refs);
for (skia::DiscardablePixelRefList::const_iterator it = pixel_refs.begin();
it != pixel_refs.end(); ++it) {
gfx::Point min(
MathUtil::UncheckedRoundDown(static_cast<int>(it->pixel_ref_rect.x()),
cell_size_.width()),
MathUtil::UncheckedRoundDown(static_cast<int>(it->pixel_ref_rect.y()),
cell_size_.height()));
gfx::Point max(MathUtil::UncheckedRoundDown(
static_cast<int>(std::ceil(it->pixel_ref_rect.right())),
cell_size_.width()),
MathUtil::UncheckedRoundDown(
static_cast<int>(std::ceil(it->pixel_ref_rect.bottom())),
cell_size_.height()));
// We recorded the picture as if it was at (0, 0) by translating by layer
// rect origin. Add the rect origin back here. It really doesn't make much
// of a difference, since the query for pixel refs doesn't use this
// information. However, since picture pile / display list also returns this
// information, it would be nice to express it relative to the layer, not
// relative to the particular implementation of the raster source.
skia::PositionPixelRef position_pixel_ref = *it;
position_pixel_ref.pixel_ref_rect.setXYWH(
position_pixel_ref.pixel_ref_rect.x() + layer_rect.x(),
position_pixel_ref.pixel_ref_rect.y() + layer_rect.y(),
position_pixel_ref.pixel_ref_rect.width(),
position_pixel_ref.pixel_ref_rect.height());
for (int y = min.y(); y <= max.y(); y += cell_size_.height()) {
for (int x = min.x(); x <= max.x(); x += cell_size_.width()) {
PixelRefMapKey key(x, y);
data_hash_map_[key].push_back(position_pixel_ref);
}
}
min_x = std::min(min_x, min.x());
min_y = std::min(min_y, min.y());
max_x = std::max(max_x, max.x());
max_y = std::max(max_y, max.y());
}
min_pixel_cell_ = gfx::Point(min_x, min_y);
max_pixel_cell_ = gfx::Point(max_x, max_y);
}
base::LazyInstance<PixelRefs> PixelRefMap::Iterator::empty_pixel_refs_;
PixelRefMap::Iterator::Iterator()
: target_pixel_ref_map_(NULL),
current_pixel_refs_(empty_pixel_refs_.Pointer()),
current_index_(0),
min_point_(-1, -1),
max_point_(-1, -1),
current_x_(0),
current_y_(0) {
}
PixelRefMap::Iterator::Iterator(const gfx::Rect& rect, const Picture* picture)
: target_pixel_ref_map_(&(picture->pixel_refs_)),
current_pixel_refs_(empty_pixel_refs_.Pointer()),
current_index_(0) {
map_layer_rect_ = picture->layer_rect_;
PointToFirstPixelRef(rect);
}
PixelRefMap::Iterator::Iterator(const gfx::Rect& rect,
const DisplayItemList* display_list)
: target_pixel_ref_map_(display_list->pixel_refs_.get()),
current_pixel_refs_(empty_pixel_refs_.Pointer()),
current_index_(0) {
map_layer_rect_ = display_list->layer_rect_;
PointToFirstPixelRef(rect);
}
PixelRefMap::Iterator::~Iterator() {
}
PixelRefMap::Iterator& PixelRefMap::Iterator::operator++() {
++current_index_;
// If we're not at the end of the list, then we have the next item.
if (current_index_ < current_pixel_refs_->size())
return *this;
DCHECK(current_y_ <= max_point_.y());
while (true) {
gfx::Size cell_size = target_pixel_ref_map_->cell_size_;
// Advance the current grid cell.
current_x_ += cell_size.width();
if (current_x_ > max_point_.x()) {
current_y_ += cell_size.height();
current_x_ = min_point_.x();
if (current_y_ > max_point_.y()) {
current_pixel_refs_ = empty_pixel_refs_.Pointer();
current_index_ = 0;
break;
}
}
// If there are no pixel refs at this grid cell, keep incrementing.
PixelRefMapKey key(current_x_, current_y_);
PixelRefHashmap::const_iterator iter =
target_pixel_ref_map_->data_hash_map_.find(key);
if (iter == target_pixel_ref_map_->data_hash_map_.end())
continue;
// We found a non-empty list: store it and get the first pixel ref.
current_pixel_refs_ = &iter->second;
current_index_ = 0;
break;
}
return *this;
}
void PixelRefMap::Iterator::PointToFirstPixelRef(const gfx::Rect& rect) {
gfx::Rect query_rect(rect);
// Early out if the query rect doesn't intersect this picture.
if (!query_rect.Intersects(map_layer_rect_) || !target_pixel_ref_map_) {
min_point_ = gfx::Point(0, 0);
max_point_ = gfx::Point(0, 0);
current_x_ = 1;
current_y_ = 1;
return;
}
// First, subtract the layer origin as cells are stored in layer space.
query_rect.Offset(-map_layer_rect_.OffsetFromOrigin());
DCHECK(!target_pixel_ref_map_->cell_size_.IsEmpty());
gfx::Size cell_size(target_pixel_ref_map_->cell_size_);
// We have to find a cell_size aligned point that corresponds to
// query_rect. Point is a multiple of cell_size.
min_point_ = gfx::Point(
MathUtil::UncheckedRoundDown(query_rect.x(), cell_size.width()),
MathUtil::UncheckedRoundDown(query_rect.y(), cell_size.height()));
max_point_ = gfx::Point(
MathUtil::UncheckedRoundDown(query_rect.right() - 1, cell_size.width()),
MathUtil::UncheckedRoundDown(query_rect.bottom() - 1,
cell_size.height()));
// Limit the points to known pixel ref boundaries.
min_point_ = gfx::Point(
std::max(min_point_.x(), target_pixel_ref_map_->min_pixel_cell_.x()),
std::max(min_point_.y(), target_pixel_ref_map_->min_pixel_cell_.y()));
max_point_ = gfx::Point(
std::min(max_point_.x(), target_pixel_ref_map_->max_pixel_cell_.x()),
std::min(max_point_.y(), target_pixel_ref_map_->max_pixel_cell_.y()));
// Make the current x be cell_size.width() less than min point, so that
// the first increment will point at min_point_.
current_x_ = min_point_.x() - cell_size.width();
current_y_ = min_point_.y();
if (current_y_ <= max_point_.y())
++(*this);
}
} // namespace cc
|
