// Copyright (c) 2012 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/base/region.h"

#include "base/debug/trace_event_argument.h"
#include "base/values.h"
#include "cc/base/simple_enclosed_region.h"

namespace cc {

Region::Region() {
}

Region::Region(const Region& region)
    : skregion_(region.skregion_) {
}

Region::Region(const gfx::Rect& rect)
    : skregion_(gfx::RectToSkIRect(rect)) {
}

Region::~Region() {
}

const Region& Region::operator=(const gfx::Rect& rect) {
  skregion_ = SkRegion(gfx::RectToSkIRect(rect));
  return *this;
}

const Region& Region::operator=(const Region& region) {
  skregion_ = region.skregion_;
  return *this;
}

void Region::Swap(Region* region) {
  region->skregion_.swap(skregion_);
}

void Region::Clear() {
  skregion_.setEmpty();
}

bool Region::IsEmpty() const {
  return skregion_.isEmpty();
}

int Region::GetRegionComplexity() const {
  return skregion_.computeRegionComplexity();
}

bool Region::Contains(const gfx::Point& point) const {
  return skregion_.contains(point.x(), point.y());
}

bool Region::Contains(const gfx::Rect& rect) const {
  if (rect.IsEmpty())
    return true;
  return skregion_.contains(gfx::RectToSkIRect(rect));
}

bool Region::Contains(const Region& region) const {
  if (region.IsEmpty())
    return true;
  return skregion_.contains(region.skregion_);
}

bool Region::Intersects(const gfx::Rect& rect) const {
  return skregion_.intersects(gfx::RectToSkIRect(rect));
}

bool Region::Intersects(const Region& region) const {
  return skregion_.intersects(region.skregion_);
}

void Region::Subtract(const gfx::Rect& rect) {
  skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kDifference_Op);
}

void Region::Subtract(const Region& region) {
  skregion_.op(region.skregion_, SkRegion::kDifference_Op);
}

void Region::Subtract(const SimpleEnclosedRegion& region) {
  for (size_t i = 0; i < region.GetRegionComplexity(); ++i) {
    skregion_.op(gfx::RectToSkIRect(region.GetRect(i)),
                 SkRegion::kDifference_Op);
  }
}

void Region::Union(const gfx::Rect& rect) {
  skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kUnion_Op);
}

void Region::Union(const Region& region) {
  skregion_.op(region.skregion_, SkRegion::kUnion_Op);
}

void Region::Intersect(const gfx::Rect& rect) {
  skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kIntersect_Op);
}

void Region::Intersect(const Region& region) {
  skregion_.op(region.skregion_, SkRegion::kIntersect_Op);
}

std::string Region::ToString() const {
  if (IsEmpty())
    return gfx::Rect().ToString();

  std::string result;
  for (Iterator it(*this); it.has_rect(); it.next()) {
    if (!result.empty())
      result += " | ";
    result += it.rect().ToString();
  }
  return result;
}

scoped_ptr<base::Value> Region::AsValue() const {
  scoped_ptr<base::ListValue> result(new base::ListValue());
  for (Iterator it(*this); it.has_rect(); it.next()) {
    gfx::Rect rect(it.rect());
    result->AppendInteger(rect.x());
    result->AppendInteger(rect.y());
    result->AppendInteger(rect.width());
    result->AppendInteger(rect.height());
  }
  return result.PassAs<base::Value>();
}

void Region::AsValueInto(base::debug::TracedValue* result) const {
  for (Iterator it(*this); it.has_rect(); it.next()) {
    gfx::Rect rect(it.rect());
    result->AppendInteger(rect.x());
    result->AppendInteger(rect.y());
    result->AppendInteger(rect.width());
    result->AppendInteger(rect.height());
  }
}

Region::Iterator::Iterator() {
}

Region::Iterator::Iterator(const Region& region)
    : it_(region.skregion_) {
}

Region::Iterator::~Iterator() {
}

}  // namespace cc