tor-browser

desktop_geometry.h (5734B)

---

/*
*  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
*  Use of this source code is governed by a BSD-style license
*  that can be found in the LICENSE file in the root of the source
*  tree. An additional intellectual property rights grant can be found
*  in the file PATENTS.  All contributing project authors may
*  be found in the AUTHORS file in the root of the source tree.
*/

#ifndef MODULES_DESKTOP_CAPTURE_DESKTOP_GEOMETRY_H_
#define MODULES_DESKTOP_CAPTURE_DESKTOP_GEOMETRY_H_

#include <stdint.h>

#include "rtc_base/strings/string_builder.h"
#include "rtc_base/system/rtc_export.h"

namespace webrtc {

// A vector in the 2D integer space. E.g. can be used to represent screen DPI.
class DesktopVector {
public:
 DesktopVector() : x_(0), y_(0) {}
 DesktopVector(int32_t x, int32_t y) : x_(x), y_(y) {}

 int32_t x() const { return x_; }
 int32_t y() const { return y_; }
 bool is_zero() const { return x_ == 0 && y_ == 0; }

 bool equals(const DesktopVector& other) const {
   return x_ == other.x_ && y_ == other.y_;
 }

 void set(int32_t x, int32_t y) {
   x_ = x;
   y_ = y;
 }

 DesktopVector add(const DesktopVector& other) const {
   return DesktopVector(x() + other.x(), y() + other.y());
 }
 DesktopVector subtract(const DesktopVector& other) const {
   return DesktopVector(x() - other.x(), y() - other.y());
 }

 DesktopVector operator-() const { return DesktopVector(-x_, -y_); }

 template <typename Sink>
 friend void AbslStringify(Sink& sink, const DesktopVector& self) {
   StringBuilder sb;
   sink.Append((sb << "x: " << self.x() << ", y: " << self.y()).str());
 }

private:
 int32_t x_;
 int32_t y_;
};

// Type used to represent screen/window size.
class DesktopSize {
public:
 DesktopSize() : width_(0), height_(0) {}
 DesktopSize(int32_t width, int32_t height) : width_(width), height_(height) {}

 int32_t width() const { return width_; }
 int32_t height() const { return height_; }

 bool is_empty() const { return width_ <= 0 || height_ <= 0; }

 bool equals(const DesktopSize& other) const {
   return width_ == other.width_ && height_ == other.height_;
 }

 void set(int32_t width, int32_t height) {
   width_ = width;
   height_ = height;
 }

private:
 int32_t width_;
 int32_t height_;
};

// Represents a rectangle on the screen.
class RTC_EXPORT DesktopRect {
public:
 static DesktopRect MakeSize(const DesktopSize& size) {
   return DesktopRect(0, 0, size.width(), size.height());
 }
 static DesktopRect MakeWH(int32_t width, int32_t height) {
   return DesktopRect(0, 0, width, height);
 }
 static DesktopRect MakeXYWH(int32_t x,
                             int32_t y,
                             int32_t width,
                             int32_t height) {
   return DesktopRect(x, y, x + width, y + height);
 }
 static DesktopRect MakeLTRB(int32_t left,
                             int32_t top,
                             int32_t right,
                             int32_t bottom) {
   return DesktopRect(left, top, right, bottom);
 }
 static DesktopRect MakeOriginSize(const DesktopVector& origin,
                                   const DesktopSize& size) {
   return MakeXYWH(origin.x(), origin.y(), size.width(), size.height());
 }

 DesktopRect() : left_(0), top_(0), right_(0), bottom_(0) {}

 int32_t left() const { return left_; }
 int32_t top() const { return top_; }
 int32_t right() const { return right_; }
 int32_t bottom() const { return bottom_; }
 int32_t width() const { return right_ - left_; }
 int32_t height() const { return bottom_ - top_; }

 void set_width(int32_t width) { right_ = left_ + width; }
 void set_height(int32_t height) { bottom_ = top_ + height; }

 DesktopVector top_left() const { return DesktopVector(left_, top_); }
 DesktopSize size() const { return DesktopSize(width(), height()); }

 bool is_empty() const { return left_ >= right_ || top_ >= bottom_; }

 bool equals(const DesktopRect& other) const {
   return left_ == other.left_ && top_ == other.top_ &&
          right_ == other.right_ && bottom_ == other.bottom_;
 }

 // Returns true if `point` lies within the rectangle boundaries.
 bool Contains(const DesktopVector& point) const;

 // Returns true if `rect` lies within the boundaries of this rectangle.
 bool ContainsRect(const DesktopRect& rect) const;

 // Finds intersection with `rect`.
 void IntersectWith(const DesktopRect& rect);

 // Extends the rectangle to cover `rect`. If `this` is empty, replaces `this`
 // with `rect`; if `rect` is empty, this function takes no effect.
 void UnionWith(const DesktopRect& rect);

 // Adds (dx, dy) to the position of the rectangle.
 void Translate(int32_t dx, int32_t dy);
 void Translate(DesktopVector d) { Translate(d.x(), d.y()); }

 // Enlarges current DesktopRect by subtracting `left_offset` and `top_offset`
 // from `left_` and `top_`, and adding `right_offset` and `bottom_offset` to
 // `right_` and `bottom_`. This function does not normalize the result, so
 // `left_` and `top_` may be less than zero or larger than `right_` and
 // `bottom_`.
 void Extend(int32_t left_offset,
             int32_t top_offset,
             int32_t right_offset,
             int32_t bottom_offset);

 // Scales current DesktopRect. This function does not impact the `top_` and
 // `left_`.
 void Scale(double horizontal, double vertical);

private:
 DesktopRect(int32_t left, int32_t top, int32_t right, int32_t bottom)
     : left_(left), top_(top), right_(right), bottom_(bottom) {}

 int32_t left_;
 int32_t top_;
 int32_t right_;
 int32_t bottom_;
};

}  // namespace webrtc

#endif  // MODULES_DESKTOP_CAPTURE_DESKTOP_GEOMETRY_H_