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// Copyright 2014 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 "remoting/host/chromeos/point_transformer.h"
#include "ash/shell.h"
#include "ui/aura/window_tree_host.h"
#include "ui/compositor/dip_util.h"
namespace remoting {
PointTransformer::PointTransformer() {
root_window_ = ash::Shell::GetPrimaryRootWindow();
root_window_->AddObserver(this);
// Set the initial display rotation.
OnWindowTransformed(root_window_);
}
PointTransformer::~PointTransformer() {
root_window_->RemoveObserver(this);
}
void PointTransformer::OnWindowTransformed(aura::Window* window) {
CHECK_EQ(window, root_window_);
ui::Layer* layer = root_window_->layer();
float scale = ui::GetDeviceScaleFactor(layer);
// Use GetTargetTransform() instead of transform() as the layer may be
// animating. GetTargetTransform() returns a transform comprising a rotation
// and a translation, but in DIPs, so we need to switch device pixels to DIPs,
// apply it, then switch from DIPs back to device pixels.
gfx::Transform rotation = layer->GetTargetTransform();
gfx::Transform inverse_rotation;
gfx::Transform to_device_pixels;
gfx::Transform to_dip;
CHECK(rotation.GetInverse(&inverse_rotation))
<< "Cannot inverse the root transform." << rotation.ToString();
to_device_pixels.Scale(scale, scale);
to_dip.Scale(1 / scale, 1 / scale);
// Matrix transformations are applied from right to left. See annotations.
// (3) (2) (1)
root_to_screen_ = to_device_pixels * rotation * to_dip;
screen_to_root_ = to_device_pixels * inverse_rotation * to_dip;
}
gfx::PointF PointTransformer::ToScreenCoordinates(
const gfx::PointF& root_location) {
gfx::Point3F screen_location(root_location);
root_to_screen_.TransformPoint(&screen_location);
return screen_location.AsPointF();
}
gfx::PointF PointTransformer::FromScreenCoordinates(
const gfx::PointF& screen_location) {
gfx::Point3F root_location(screen_location);
screen_to_root_.TransformPoint(&root_location);
return root_location.AsPointF();
}
} // namespace remoting
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