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// Copyright 2020 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/gfx/geometry/resize_utils.h"
#include <algorithm>
#include <ostream>
#include "base/check_op.h"
#include "base/numerics/safe_conversions.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
namespace gfx {
namespace {
// This function decides whether SizeRectToAspectRatio() will adjust the height
// to match the specified width (resizing horizontally) or vice versa (resizing
// vertically).
bool IsResizingHorizontally(ResizeEdge resize_edge) {
switch (resize_edge) {
case ResizeEdge::kLeft:
case ResizeEdge::kRight:
case ResizeEdge::kTopLeft:
case ResizeEdge::kBottomLeft:
return true;
default:
return false;
}
}
} // namespace
void SizeRectToAspectRatioWithExcludedMargin(
ResizeEdge resize_edge,
float aspect_ratio,
const Size& original_min_window_size,
std::optional<Size> max_window_size,
const Size& excluded_margin,
Rect& rect) {
DCHECK_GT(aspect_ratio, 0.0f);
if (max_window_size.has_value()) {
DCHECK_GE(max_window_size->width(), original_min_window_size.width());
DCHECK_GE(max_window_size->height(), original_min_window_size.height());
DCHECK_GE(max_window_size->width(), excluded_margin.width());
DCHECK_GE(max_window_size->height(), excluded_margin.height());
DCHECK(Rect(rect.origin(), *max_window_size).Contains(rect))
<< rect.ToString() << " is larger than the maximum size "
<< max_window_size->ToString();
}
DCHECK(rect.Contains(Rect(rect.origin(), original_min_window_size)))
<< rect.ToString() << " is smaller than the minimum size "
<< original_min_window_size.ToString();
// Compute the aspect ratio with the excluded margin removed from both the
// rectangle and the maximum size. Note that the edge we ask for doesn't
// really matter; we'll position the resulting rectangle correctly later.
Size new_size(rect.width() - excluded_margin.width(),
rect.height() - excluded_margin.height());
if (max_window_size) {
max_window_size.emplace(
max_window_size->width() - excluded_margin.width(),
max_window_size->height() - excluded_margin.height());
}
// Also remove the margin from the minimum size, since it'll get added back at
// the end.
const Size min_window_size = original_min_window_size - excluded_margin;
if (IsResizingHorizontally(resize_edge)) {
new_size.set_height(base::ClampRound(new_size.width() / aspect_ratio));
if (min_window_size.height() > new_size.height() ||
(max_window_size.has_value() &&
new_size.height() > max_window_size->height())) {
if (max_window_size.has_value()) {
new_size.set_height(std::clamp(new_size.height(),
min_window_size.height(),
max_window_size->height()));
} else {
new_size.set_height(min_window_size.height());
}
new_size.set_width(base::ClampRound(new_size.height() * aspect_ratio));
}
} else {
new_size.set_width(base::ClampRound(new_size.height() * aspect_ratio));
if (min_window_size.width() > new_size.width() ||
(max_window_size.has_value() &&
new_size.width() > max_window_size->width())) {
if (max_window_size.has_value()) {
new_size.set_width(std::clamp(new_size.width(), min_window_size.width(),
max_window_size->width()));
} else {
new_size.set_width(min_window_size.width());
}
new_size.set_height(base::ClampRound(new_size.width() / aspect_ratio));
}
}
// The dimensions might still be outside of the allowed ranges at this point.
// This happens when the aspect ratio makes it impossible to fit |rect|
// within the size limits without letter-/pillarboxing.
if (max_window_size.has_value())
new_size.SetToMin(*max_window_size);
// The minimum size also excludes any excluded margin, so the content area has
// to make up the adjusted difference.
new_size.SetToMax(min_window_size);
// Now add the excluded margin back to the total size, so that the total size
// is aligned with the resize edge.
new_size.Enlarge(excluded_margin.width(), excluded_margin.height());
// |rect| bounds before sizing to aspect ratio.
int left = rect.x();
int top = rect.y();
int right = rect.right();
int bottom = rect.bottom();
switch (resize_edge) {
case ResizeEdge::kRight:
case ResizeEdge::kBottom:
right = new_size.width() + left;
bottom = top + new_size.height();
break;
case ResizeEdge::kTop:
right = new_size.width() + left;
top = bottom - new_size.height();
break;
case ResizeEdge::kLeft:
case ResizeEdge::kTopLeft:
left = right - new_size.width();
top = bottom - new_size.height();
break;
case ResizeEdge::kTopRight:
right = left + new_size.width();
top = bottom - new_size.height();
break;
case ResizeEdge::kBottomLeft:
left = right - new_size.width();
bottom = top + new_size.height();
break;
case ResizeEdge::kBottomRight:
right = left + new_size.width();
bottom = top + new_size.height();
break;
}
rect.SetByBounds(left, top, right, bottom);
}
void SizeRectToAspectRatio(ResizeEdge resize_edge,
float aspect_ratio,
const Size& min_window_size,
std::optional<Size> max_window_size,
Rect* rect) {
SizeRectToAspectRatioWithExcludedMargin(
resize_edge, aspect_ratio, min_window_size, std::move(max_window_size),
gfx::Size(), *rect);
}
} // namespace gfx
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