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243 lines
8.7 KiB
243 lines
8.7 KiB
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef UI_GFX_GEOMETRY_RECT_F_H_
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#define UI_GFX_GEOMETRY_RECT_F_H_
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#include <iosfwd>
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#include <string>
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#include "build/build_config.h"
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#include "ui/gfx/geometry/point_f.h"
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#include "ui/gfx/geometry/rect.h"
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#include "ui/gfx/geometry/size_f.h"
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#include "ui/gfx/geometry/vector2d_f.h"
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#if defined(OS_MACOSX)
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typedef struct CGRect CGRect;
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#endif
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namespace gfx {
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class InsetsF;
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// A floating version of gfx::Rect.
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class GFX_EXPORT RectF {
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public:
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constexpr RectF() = default;
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constexpr RectF(float width, float height) : size_(width, height) {}
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constexpr RectF(float x, float y, float width, float height)
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: origin_(x, y), size_(width, height) {}
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constexpr explicit RectF(const SizeF& size) : size_(size) {}
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constexpr RectF(const PointF& origin, const SizeF& size)
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: origin_(origin), size_(size) {}
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constexpr explicit RectF(const Rect& r)
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: RectF(static_cast<float>(r.x()),
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static_cast<float>(r.y()),
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static_cast<float>(r.width()),
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static_cast<float>(r.height())) {}
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#if defined(OS_MACOSX)
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explicit RectF(const CGRect& r);
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// Construct an equivalent CoreGraphics object.
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CGRect ToCGRect() const;
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#endif
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constexpr float x() const { return origin_.x(); }
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void set_x(float x) { origin_.set_x(x); }
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constexpr float y() const { return origin_.y(); }
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void set_y(float y) { origin_.set_y(y); }
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constexpr float width() const { return size_.width(); }
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void set_width(float width) { size_.set_width(width); }
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constexpr float height() const { return size_.height(); }
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void set_height(float height) { size_.set_height(height); }
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constexpr const PointF& origin() const { return origin_; }
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void set_origin(const PointF& origin) { origin_ = origin; }
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constexpr const SizeF& size() const { return size_; }
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void set_size(const SizeF& size) { size_ = size; }
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constexpr float right() const { return x() + width(); }
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constexpr float bottom() const { return y() + height(); }
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constexpr PointF top_right() const { return PointF(right(), y()); }
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constexpr PointF bottom_left() const { return PointF(x(), bottom()); }
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constexpr PointF bottom_right() const { return PointF(right(), bottom()); }
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Vector2dF OffsetFromOrigin() const { return Vector2dF(x(), y()); }
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void SetRect(float x, float y, float width, float height) {
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origin_.SetPoint(x, y);
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size_.SetSize(width, height);
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}
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// Shrink the rectangle by a horizontal and vertical distance on all sides.
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void Inset(float horizontal, float vertical) {
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Inset(horizontal, vertical, horizontal, vertical);
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}
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// Shrink the rectangle by the given insets.
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void Inset(const InsetsF& insets);
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// Shrink the rectangle by the specified amount on each side.
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void Inset(float left, float top, float right, float bottom);
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// Move the rectangle by a horizontal and vertical distance.
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void Offset(float horizontal, float vertical);
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void Offset(const Vector2dF& distance) { Offset(distance.x(), distance.y()); }
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void operator+=(const Vector2dF& offset);
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void operator-=(const Vector2dF& offset);
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InsetsF InsetsFrom(const RectF& inner) const;
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// Returns true if the area of the rectangle is zero.
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bool IsEmpty() const { return size_.IsEmpty(); }
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// A rect is less than another rect if its origin is less than
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// the other rect's origin. If the origins are equal, then the
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// shortest rect is less than the other. If the origin and the
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// height are equal, then the narrowest rect is less than.
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// This comparison is required to use Rects in sets, or sorted
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// vectors.
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bool operator<(const RectF& other) const;
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// Returns true if the point identified by point_x and point_y falls inside
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// this rectangle. The point (x, y) is inside the rectangle, but the
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// point (x + width, y + height) is not.
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bool Contains(float point_x, float point_y) const;
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// Returns true if the specified point is contained by this rectangle.
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bool Contains(const PointF& point) const {
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return Contains(point.x(), point.y());
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}
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// Returns true if this rectangle contains the specified rectangle.
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bool Contains(const RectF& rect) const;
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// Returns true if this rectangle intersects the specified rectangle.
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// An empty rectangle doesn't intersect any rectangle.
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bool Intersects(const RectF& rect) const;
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// Computes the intersection of this rectangle with the given rectangle.
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void Intersect(const RectF& rect);
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// Computes the union of this rectangle with the given rectangle. The union
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// is the smallest rectangle containing both rectangles.
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void Union(const RectF& rect);
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// Computes the rectangle resulting from subtracting |rect| from |*this|,
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// i.e. the bounding rect of |Region(*this) - Region(rect)|.
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void Subtract(const RectF& rect);
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// Fits as much of the receiving rectangle into the supplied rectangle as
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// possible, becoming the result. For example, if the receiver had
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// a x-location of 2 and a width of 4, and the supplied rectangle had
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// an x-location of 0 with a width of 5, the returned rectangle would have
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// an x-location of 1 with a width of 4.
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void AdjustToFit(const RectF& rect);
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// Returns the center of this rectangle.
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PointF CenterPoint() const;
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// Becomes a rectangle that has the same center point but with a size capped
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// at given |size|.
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void ClampToCenteredSize(const SizeF& size);
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// Splits |this| in two halves, |left_half| and |right_half|.
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void SplitVertically(RectF* left_half, RectF* right_half) const;
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// Returns true if this rectangle shares an entire edge (i.e., same width or
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// same height) with the given rectangle, and the rectangles do not overlap.
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bool SharesEdgeWith(const RectF& rect) const;
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// Returns the manhattan distance from the rect to the point. If the point is
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// inside the rect, returns 0.
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float ManhattanDistanceToPoint(const PointF& point) const;
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// Returns the manhattan distance between the contents of this rect and the
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// contents of the given rect. That is, if the intersection of the two rects
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// is non-empty then the function returns 0. If the rects share a side, it
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// returns the smallest non-zero value appropriate for float.
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float ManhattanInternalDistance(const RectF& rect) const;
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// Scales the rectangle by |scale|.
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void Scale(float scale) {
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Scale(scale, scale);
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}
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void Scale(float x_scale, float y_scale) {
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set_origin(ScalePoint(origin(), x_scale, y_scale));
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set_size(ScaleSize(size(), x_scale, y_scale));
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}
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// This method reports if the RectF can be safely converted to an integer
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// Rect. When it is false, some dimension of the RectF is outside the bounds
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// of what an integer can represent, and converting it to a Rect will require
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// clamping.
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bool IsExpressibleAsRect() const;
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std::string ToString() const;
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private:
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PointF origin_;
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SizeF size_;
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};
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inline bool operator==(const RectF& lhs, const RectF& rhs) {
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return lhs.origin() == rhs.origin() && lhs.size() == rhs.size();
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}
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inline bool operator!=(const RectF& lhs, const RectF& rhs) {
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return !(lhs == rhs);
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}
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inline RectF operator+(const RectF& lhs, const Vector2dF& rhs) {
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return RectF(lhs.x() + rhs.x(), lhs.y() + rhs.y(),
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lhs.width(), lhs.height());
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}
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inline RectF operator-(const RectF& lhs, const Vector2dF& rhs) {
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return RectF(lhs.x() - rhs.x(), lhs.y() - rhs.y(),
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lhs.width(), lhs.height());
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}
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inline RectF operator+(const Vector2dF& lhs, const RectF& rhs) {
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return rhs + lhs;
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}
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GFX_EXPORT RectF IntersectRects(const RectF& a, const RectF& b);
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GFX_EXPORT RectF UnionRects(const RectF& a, const RectF& b);
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GFX_EXPORT RectF SubtractRects(const RectF& a, const RectF& b);
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inline RectF ScaleRect(const RectF& r, float x_scale, float y_scale) {
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return RectF(r.x() * x_scale, r.y() * y_scale,
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r.width() * x_scale, r.height() * y_scale);
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}
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inline RectF ScaleRect(const RectF& r, float scale) {
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return ScaleRect(r, scale, scale);
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}
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// Constructs a rectangle with |p1| and |p2| as opposite corners.
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//
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// This could also be thought of as "the smallest rect that contains both
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// points", except that we consider points on the right/bottom edges of the
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// rect to be outside the rect. So technically one or both points will not be
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// contained within the rect, because they will appear on one of these edges.
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GFX_EXPORT RectF BoundingRect(const PointF& p1, const PointF& p2);
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// This is declared here for use in gtest-based unit tests but is defined in
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// the //ui/gfx:test_support target. Depend on that to use this in your unit
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// test. This should not be used in production code - call ToString() instead.
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void PrintTo(const RectF& rect, ::std::ostream* os);
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} // namespace gfx
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#endif // UI_GFX_GEOMETRY_RECT_F_H_
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