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// 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"
#include "base/compiler_specific.h"
MSVC_PUSH_WARNING_LEVEL(0);
#include "RenderLayer.h"
#include "RenderObject.h"
MSVC_POP_WARNING();
#undef LOG
#include "webkit/glue/stacking_order_iterator.h"
//
// RenderLayerIterator
//
RenderLayerIterator::RenderLayerIterator() {
}
void RenderLayerIterator::Reset(const WebCore::IntRect& bounds,
WebCore::RenderLayer* rl) {
bounds_ = bounds;
root_layer_ = rl;
if (rl) {
context_stack_.push_back(Context(rl));
}
}
WebCore::RenderLayer* RenderLayerIterator::Next() {
while (context_stack_.size()) {
Context* ctx = &(context_stack_.back());
if (!ctx->layer()->boundingBox(root_layer_).intersects(bounds_)) {
// Doesn't overlap bounds; skip this layer.
context_stack_.pop_back();
} else 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_->updateNormalFlowList();
}
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_->normalFlowList() &&
next_overflow_ >= 0 &&
next_overflow_ < layer_->normalFlowList()->size();
}
RenderLayerIterator::Context RenderLayerIterator::Context::NextOverflow() {
ASSERT(HasMoreOverflow());
return Context(layer_->normalFlowList()->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(WebCore::IntRect(0, 0, 0, 0), NULL);
}
void StackingOrderIterator::Reset(const WebCore::IntRect& bounds,
WebCore::RenderLayer* rl) {
layer_iterator_.Reset(bounds, 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_;
}
}
return current_object_;
}
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