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// 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 "ppapi/cpp/rect.h"
#include <algorithm>
namespace {
void AdjustAlongAxis(int32_t dst_origin, int32_t dst_size,
int32_t* origin, int32_t* size) {
if (*origin < dst_origin) {
*origin = dst_origin;
*size = std::min(dst_size, *size);
} else {
*size = std::min(dst_size, *size);
*origin = std::min(dst_origin + dst_size, *origin + *size) - *size;
}
}
} // namespace
namespace pp {
void Rect::Inset(int32_t left, int32_t top, int32_t right, int32_t bottom) {
Offset(left, top);
set_width(std::max<int32_t>(width() - left - right, 0));
set_height(std::max<int32_t>(height() - top - bottom, 0));
}
void Rect::Offset(int32_t horizontal, int32_t vertical) {
rect_.point.x += horizontal;
rect_.point.y += vertical;
}
bool Rect::Contains(int32_t point_x, int32_t point_y) const {
return (point_x >= x()) && (point_x < right()) &&
(point_y >= y()) && (point_y < bottom());
}
bool Rect::Contains(const Rect& rect) const {
return (rect.x() >= x() && rect.right() <= right() &&
rect.y() >= y() && rect.bottom() <= bottom());
}
bool Rect::Intersects(const Rect& rect) const {
return !(rect.x() >= right() || rect.right() <= x() ||
rect.y() >= bottom() || rect.bottom() <= y());
}
Rect Rect::Intersect(const Rect& rect) const {
int32_t rx = std::max(x(), rect.x());
int32_t ry = std::max(y(), rect.y());
int32_t rr = std::min(right(), rect.right());
int32_t rb = std::min(bottom(), rect.bottom());
if (rx >= rr || ry >= rb)
rx = ry = rr = rb = 0; // non-intersecting
return Rect(rx, ry, rr - rx, rb - ry);
}
Rect Rect::Union(const Rect& rect) const {
// special case empty rects...
if (IsEmpty())
return rect;
if (rect.IsEmpty())
return *this;
int32_t rx = std::min(x(), rect.x());
int32_t ry = std::min(y(), rect.y());
int32_t rr = std::max(right(), rect.right());
int32_t rb = std::max(bottom(), rect.bottom());
return Rect(rx, ry, rr - rx, rb - ry);
}
Rect Rect::Subtract(const Rect& rect) const {
// boundary cases:
if (!Intersects(rect))
return *this;
if (rect.Contains(*this))
return Rect();
int32_t rx = x();
int32_t ry = y();
int32_t rr = right();
int32_t rb = bottom();
if (rect.y() <= y() && rect.bottom() >= bottom()) {
// complete int32_tersection in the y-direction
if (rect.x() <= x()) {
rx = rect.right();
} else {
rr = rect.x();
}
} else if (rect.x() <= x() && rect.right() >= right()) {
// complete int32_tersection in the x-direction
if (rect.y() <= y()) {
ry = rect.bottom();
} else {
rb = rect.y();
}
}
return Rect(rx, ry, rr - rx, rb - ry);
}
Rect Rect::AdjustToFit(const Rect& rect) const {
int32_t new_x = x();
int32_t new_y = y();
int32_t new_width = width();
int32_t new_height = height();
AdjustAlongAxis(rect.x(), rect.width(), &new_x, &new_width);
AdjustAlongAxis(rect.y(), rect.height(), &new_y, &new_height);
return Rect(new_x, new_y, new_width, new_height);
}
Point Rect::CenterPoint() const {
return Point(x() + (width() + 1) / 2, y() + (height() + 1) / 2);
}
bool Rect::SharesEdgeWith(const Rect& rect) const {
return (y() == rect.y() && height() == rect.height() &&
(x() == rect.right() || right() == rect.x())) ||
(x() == rect.x() && width() == rect.width() &&
(y() == rect.bottom() || bottom() == rect.y()));
}
} // namespace pp
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