blob: b726a8ac9648a23d64b84929718873c43017dfb8 (
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
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
|
// Copyright (c) 2006-2008 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 "config.h"
#pragma warning(push, 0)
#include "RenderLayer.h"
#include "RenderObject.h"
#pragma warning(pop)
#undef LOG
#include "webkit/glue/stacking_order_iterator.h"
//
// RenderLayerIterator
//
RenderLayerIterator::RenderLayerIterator() {
}
void RenderLayerIterator::Reset(WebCore::RenderLayer* rl) {
if (rl) {
context_stack_.push_back(Context(rl));
}
}
WebCore::RenderLayer* RenderLayerIterator::Next() {
while (context_stack_.size()) {
Context* ctx = &(context_stack_.back());
if (ctx->HasMoreNeg()) {
context_stack_.push_back(ctx->NextNeg());
} else if (ctx->HasSelf()) {
// Emit self.
return ctx->NextSelf();
} else if (ctx->HasMoreOverflow()) {
context_stack_.push_back(ctx->NextOverflow());
} else if (ctx->HasMorePos()) {
context_stack_.push_back(ctx->NextPos());
} else {
// Nothing left in this context. Pop.
context_stack_.pop_back();
}
}
return NULL;
}
RenderLayerIterator::Context::Context(WebCore::RenderLayer* layer)
: layer_(layer),
next_neg_(0),
next_self_(0),
next_overflow_(0),
next_pos_(0) {
ASSERT(layer_);
layer_->updateZOrderLists();
layer_->updateOverflowList();
}
bool RenderLayerIterator::Context::HasMoreNeg() {
return layer_->negZOrderList() &&
next_neg_ < layer_->negZOrderList()->size();
}
RenderLayerIterator::Context RenderLayerIterator::Context::NextNeg() {
ASSERT(HasMoreNeg());
return Context(layer_->negZOrderList()->at(next_neg_++));
}
bool RenderLayerIterator::Context::HasSelf() {
return next_self_ < 1;
}
WebCore::RenderLayer* RenderLayerIterator::Context::NextSelf() {
ASSERT(HasSelf());
next_self_ = 1;
return layer_;
}
bool RenderLayerIterator::Context::HasMoreOverflow() {
return layer_->overflowList() &&
next_overflow_ >= 0 &&
next_overflow_ < layer_->overflowList()->size();
}
RenderLayerIterator::Context RenderLayerIterator::Context::NextOverflow() {
ASSERT(HasMoreOverflow());
return Context(layer_->overflowList()->at(next_overflow_++));
}
bool RenderLayerIterator::Context::HasMorePos() {
return layer_->posZOrderList() &&
next_pos_ < layer_->posZOrderList()->size();
}
RenderLayerIterator::Context RenderLayerIterator::Context::NextPos() {
ASSERT(HasMorePos());
return Context(layer_->posZOrderList()->at(next_pos_++));
}
//
// StackingOrderIterator
//
StackingOrderIterator::StackingOrderIterator() {
Reset(NULL);
}
void StackingOrderIterator::Reset(WebCore::RenderLayer* rl) {
layer_iterator_.Reset(rl);
current_object_ = NULL;
current_layer_root_ = NULL;
}
WebCore::RenderObject* StackingOrderIterator::Next() {
if (current_object_) {
// Get the next object inside the current layer.
current_object_ = current_object_->nextInPreOrder(current_layer_root_);
// Skip any sub-layers we encounter along the way; they are
// visited (in the correct stacking order) by layer_iterator_.
while (current_object_ && current_object_->hasLayer()) {
current_object_ = current_object_->
nextInPreOrderAfterChildren(current_layer_root_);
}
}
if (!current_object_) {
// Start the next layer.
WebCore::RenderLayer* layer = layer_iterator_.Next();
if (layer) {
current_object_ = layer->renderer();
current_layer_root_ = current_object_;
}
// No more layers.
}
return current_object_;
}
|