cc/base/region.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/base/region.h"
   6
   7 #include "base/debug/trace_event_argument.h"
   8 #include "base/values.h"
   9 #include "cc/base/simple_enclosed_region.h"
  10
  11 namespace cc {
  12
  13 Region::Region() {
  14 }
  15
  16 Region::Region(const Region& region)
  17     : skregion_(region.skregion_) {
  18 }
  19
  20 Region::Region(const gfx::Rect& rect)
  21     : skregion_(gfx::RectToSkIRect(rect)) {
  22 }
  23
  24 Region::~Region() {
  25 }
  26
  27 const Region& Region::operator=(const gfx::Rect& rect) {
  28   skregion_ = SkRegion(gfx::RectToSkIRect(rect));
  29   return *this;
  30 }
  31
  32 const Region& Region::operator=(const Region& region) {
  33   skregion_ = region.skregion_;
  34   return *this;
  35 }
  36
  37 void Region::Swap(Region* region) {
  38   region->skregion_.swap(skregion_);
  39 }
  40
  41 void Region::Clear() {
  42   skregion_.setEmpty();
  43 }
  44
  45 bool Region::IsEmpty() const {
  46   return skregion_.isEmpty();
  47 }
  48
  49 int Region::GetRegionComplexity() const {
  50   return skregion_.computeRegionComplexity();
  51 }
  52
  53 bool Region::Contains(const gfx::Point& point) const {
  54   return skregion_.contains(point.x(), point.y());
  55 }
  56
  57 bool Region::Contains(const gfx::Rect& rect) const {
  58   if (rect.IsEmpty())
  59     return true;
  60   return skregion_.contains(gfx::RectToSkIRect(rect));
  61 }
  62
  63 bool Region::Contains(const Region& region) const {
  64   if (region.IsEmpty())
  65     return true;
  66   return skregion_.contains(region.skregion_);
  67 }
  68
  69 bool Region::Intersects(const gfx::Rect& rect) const {
  70   return skregion_.intersects(gfx::RectToSkIRect(rect));
  71 }
  72
  73 bool Region::Intersects(const Region& region) const {
  74   return skregion_.intersects(region.skregion_);
  75 }
  76
  77 void Region::Subtract(const gfx::Rect& rect) {
  78   skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kDifference_Op);
  79 }
  80
  81 void Region::Subtract(const Region& region) {
  82   skregion_.op(region.skregion_, SkRegion::kDifference_Op);
  83 }
  84
  85 void Region::Subtract(const SimpleEnclosedRegion& region) {
  86   for (size_t i = 0; i < region.GetRegionComplexity(); ++i) {
  87     skregion_.op(gfx::RectToSkIRect(region.GetRect(i)),
  88                  SkRegion::kDifference_Op);
  89   }
  90 }
  91
  92 void Region::Union(const gfx::Rect& rect) {
  93   skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kUnion_Op);
  94 }
  95
  96 void Region::Union(const Region& region) {
  97   skregion_.op(region.skregion_, SkRegion::kUnion_Op);
  98 }
  99
 100 void Region::Intersect(const gfx::Rect& rect) {
 101   skregion_.op(gfx::RectToSkIRect(rect), SkRegion::kIntersect_Op);
 102 }
 103
 104 void Region::Intersect(const Region& region) {
 105   skregion_.op(region.skregion_, SkRegion::kIntersect_Op);
 106 }
 107
 108 std::string Region::ToString() const {
 109   if (IsEmpty())
 110     return gfx::Rect().ToString();
 111
 112   std::string result;
 113   for (Iterator it(*this); it.has_rect(); it.next()) {
 114     if (!result.empty())
 115       result += " | ";
 116     result += it.rect().ToString();
 117   }
 118   return result;
 119 }
 120
 121 scoped_ptr<base::Value> Region::AsValue() const {
 122   scoped_ptr<base::ListValue> result(new base::ListValue());
 123   for (Iterator it(*this); it.has_rect(); it.next()) {
 124     gfx::Rect rect(it.rect());
 125     result->AppendInteger(rect.x());
 126     result->AppendInteger(rect.y());
 127     result->AppendInteger(rect.width());
 128     result->AppendInteger(rect.height());
 129   }
 130   return result.PassAs<base::Value>();
 131 }
 132
 133 void Region::AsValueInto(base::debug::TracedValue* result) const {
 134   for (Iterator it(*this); it.has_rect(); it.next()) {
 135     gfx::Rect rect(it.rect());
 136     result->AppendInteger(rect.x());
 137     result->AppendInteger(rect.y());
 138     result->AppendInteger(rect.width());
 139     result->AppendInteger(rect.height());
 140   }
 141 }
 142
 143 Region::Iterator::Iterator() {
 144 }
 145
 146 Region::Iterator::Iterator(const Region& region)
 147     : it_(region.skregion_) {
 148 }
 149
 150 Region::Iterator::~Iterator() {
 151 }
 152
 153 }  // namespace cc