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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/win/scaling_util.h"
#include <algorithm>
#include "base/check.h"
#include "base/notreached.h"
#include "base/numerics/safe_conversions.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/range/range.h"
namespace {
// Represents the amount of rotation an object has about a coordinate plane.
enum class CoordinateRotation {
COORDINATE_ROTATE_0,
COORDINATE_ROTATE_90,
COORDINATE_ROTATE_180,
COORDINATE_ROTATE_270,
};
// Returns the CoordinateRotation necessary for |ref| and |other| so that |ref|
// is positioned on top of |other|.
CoordinateRotation ComputeCoordinateRotationRefTop(const gfx::Rect& ref,
const gfx::Rect& other) {
if (ref.bottom() <= other.y())
return CoordinateRotation::COORDINATE_ROTATE_0;
if (other.right() <= ref.x())
return CoordinateRotation::COORDINATE_ROTATE_90;
if (other.bottom() <= ref.y())
return CoordinateRotation::COORDINATE_ROTATE_180;
return CoordinateRotation::COORDINATE_ROTATE_270;
}
gfx::Rect CoordinateRotateRectangle90(const gfx::Rect& rect) {
return gfx::Rect(rect.y(), -rect.x() - rect.width(),
rect.height(), rect.width());
}
gfx::Rect CoordinateRotateRectangle180(const gfx::Rect& rect) {
return gfx::Rect(-rect.x() - rect.width(), -rect.y() -rect.height(),
rect.width(), rect.height());
}
gfx::Rect CoordinateRotateRectangle270(const gfx::Rect& rect) {
return gfx::Rect(-rect.y() - rect.height(), rect.x(),
rect.height(), rect.width());
}
gfx::Rect CoordinateRotateRect(const gfx::Rect& rect,
CoordinateRotation rotation) {
switch (rotation) {
case CoordinateRotation::COORDINATE_ROTATE_90:
return CoordinateRotateRectangle90(rect);
case CoordinateRotation::COORDINATE_ROTATE_180:
return CoordinateRotateRectangle180(rect);
case CoordinateRotation::COORDINATE_ROTATE_270:
return CoordinateRotateRectangle270(rect);
default:
return rect;
}
}
bool InRange(int target, int lower_bound, int upper_bound) {
return lower_bound <= target && target <= upper_bound;
}
// Scaled |unscaled_offset| to the same relative position on |unscaled_length|
// based off of |unscaled_length|'s |scale_factor|.
int ScaleOffset(int unscaled_length, float scale_factor, int unscaled_offset) {
float scaled_length = static_cast<float>(unscaled_length) / scale_factor;
float percent =
static_cast<float>(unscaled_offset) / static_cast<float>(unscaled_length);
return base::ClampFloor(scaled_length * percent);
}
} // namespace
namespace display {
namespace win {
bool DisplayInfosTouch(const internal::DisplayInfo& a,
const internal::DisplayInfo& b) {
const gfx::Rect& a_rect = a.screen_rect();
const gfx::Rect& b_rect = b.screen_rect();
int max_left = std::max(a_rect.x(), b_rect.x());
int max_top = std::max(a_rect.y(), b_rect.y());
int min_right = std::min(a_rect.right(), b_rect.right());
int min_bottom = std::min(a_rect.bottom(), b_rect.bottom());
return (max_left == min_right &&
a_rect.y() <= b_rect.bottom() &&
b_rect.y() <= a_rect.bottom()) ||
(max_top == min_bottom &&
a_rect.x() <= b_rect.right() &&
b_rect.x() <= a_rect.right());
}
DisplayPlacement::Position CalculateDisplayPosition(
const internal::DisplayInfo& parent,
const internal::DisplayInfo& current) {
const gfx::Rect& parent_rect = parent.screen_rect();
const gfx::Rect& current_rect = current.screen_rect();
int max_left = std::max(parent_rect.x(), current_rect.x());
int max_top = std::max(parent_rect.y(), current_rect.y());
int min_right = std::min(parent_rect.right(), current_rect.right());
int min_bottom = std::min(parent_rect.bottom(), current_rect.bottom());
if (max_left == min_right && max_top == min_bottom) {
// Corner touching.
if (parent_rect.bottom() == max_top)
return DisplayPlacement::Position::BOTTOM;
if (parent_rect.x() == max_left)
return DisplayPlacement::Position::LEFT;
return DisplayPlacement::Position::TOP;
}
if (max_left == min_right &&
parent_rect.y() <= current_rect.bottom() &&
current_rect.y() <= parent_rect.bottom()) {
// Vertical edge touching.
return parent_rect.x() == max_left
? DisplayPlacement::Position::LEFT
: DisplayPlacement::Position::RIGHT;
}
if (max_top == min_bottom &&
parent_rect.x() <= current_rect.right() &&
current_rect.x() <= parent_rect.right()) {
// Horizontal edge touching.
return parent_rect.y() == max_top
? DisplayPlacement::Position::TOP
: DisplayPlacement::Position::BOTTOM;
}
NOTREACHED() << "CalculateDisplayPosition relies on touching DisplayInfos.";
}
DisplayPlacement CalculateDisplayPlacement(
const internal::DisplayInfo& parent,
const internal::DisplayInfo& current) {
DCHECK(DisplayInfosTouch(parent, current)) << "DisplayInfos must touch.";
DisplayPlacement placement;
placement.parent_display_id = parent.id();
placement.display_id = current.id();
placement.position = CalculateDisplayPosition(parent, current);
int parent_begin = 0;
int parent_end = 0;
int current_begin = 0;
int current_end = 0;
switch (placement.position) {
case DisplayPlacement::Position::TOP:
case DisplayPlacement::Position::BOTTOM:
parent_begin = parent.screen_rect().x();
parent_end = parent.screen_rect().right();
current_begin = current.screen_rect().x();
current_end = current.screen_rect().right();
break;
case DisplayPlacement::Position::LEFT:
case DisplayPlacement::Position::RIGHT:
parent_begin = parent.screen_rect().y();
parent_end = parent.screen_rect().bottom();
current_begin = current.screen_rect().y();
current_end = current.screen_rect().bottom();
break;
}
// Since we're talking offsets, make everything relative to parent_begin.
parent_end -= parent_begin;
current_begin -= parent_begin;
current_end -= parent_begin;
parent_begin = 0;
// There are a few ways lines can intersect:
// End Aligned
// CURRENT's offset is relative to the end (in our world, BOTTOM_RIGHT).
// +-PARENT----------------+
// +-CURRENT------------+
//
// Positioning based off of |current_begin|.
// CURRENT's offset is simply a percentage of its position on PARENT.
// +-PARENT----------------+
// +-CURRENT------------+
//
// Positioning based off of |current_end|.
// CURRENT's offset is dependent on the percentage of its end position on
// PARENT.
// +-PARENT----------------+
// +-CURRENT------------+
//
// Positioning based off of |parent_begin| on current.
// CURRENT's offset is dependent on the percentage of its end position on
// PARENT.
// +-PARENT----------------+
// +-CURRENT--------------------------+
if (parent_end == current_end) {
// End aligned.
placement.offset_reference =
DisplayPlacement::OffsetReference::BOTTOM_RIGHT;
placement.offset = 0;
} else if (InRange(current_begin, parent_begin, parent_end)) {
placement.offset = ScaleOffset(parent_end,
parent.device_scale_factor(),
current_begin);
} else if (InRange(current_end, parent_begin, parent_end)) {
placement.offset_reference =
DisplayPlacement::OffsetReference::BOTTOM_RIGHT;
placement.offset = ScaleOffset(parent_end,
parent.device_scale_factor(),
parent_end - current_end);
} else {
DCHECK(InRange(parent_begin, current_begin, current_end));
placement.offset = ScaleOffset(current_end - current_begin,
current.device_scale_factor(),
current_begin);
}
return placement;
}
// This function rotates the rectangles so that |ref| is always on top of
// |rect|, allowing the function to concentrate on comparing |ref|'s bottom
// corners and |rect|'s top corners when the rects don't overlap vertically.
int64_t SquaredDistanceBetweenRects(const gfx::Rect& ref,
const gfx::Rect& rect) {
gfx::Rect intersection_rect = gfx::IntersectRects(ref, rect);
if (!intersection_rect.IsEmpty())
return -(intersection_rect.width() * intersection_rect.height());
CoordinateRotation degrees = ComputeCoordinateRotationRefTop(ref, rect);
gfx::Rect top_rect(CoordinateRotateRect(ref, degrees));
gfx::Rect bottom_rect(CoordinateRotateRect(rect, degrees));
if (bottom_rect.right() < top_rect.x())
return (bottom_rect.top_right() - top_rect.bottom_left()).LengthSquared();
else if (top_rect.right() < bottom_rect.x())
return (bottom_rect.origin() - top_rect.bottom_right()).LengthSquared();
int distance = bottom_rect.y() - top_rect.bottom();
return distance * distance;
}
} // namespace win
} // namespace display
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