blob: 2c6cb35df700308184a63ad7c9ac2b217b71f1d6 [file] [log] [blame]
// 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 <stdint.h>
#include "ash/ash_export.h"
#include "ash/display/window_tree_host_manager.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "ui/gfx/transform.h"
namespace ui {
struct TouchscreenDevice;
} // namespace ui
namespace ash {
// TouchTransformerController listens to display configuration change
// and updates the touch transformation for touch displays.
class ASH_EXPORT TouchTransformerController
: public WindowTreeHostManager::Observer {
~TouchTransformerController() override;
// Updates the TouchTransformer for touch device and pushes the new
// TouchTransformer into device manager.
void UpdateTouchTransformer() const;
// WindowTreeHostManager::Observer:
void OnDisplaysInitialized() override;
void OnDisplayConfigurationChanged() override;
FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, SoftwareMirrorMode);
FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, ExtendedMode);
FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, TouchRadiusScale);
// Returns a transform that will be used to change an event's location from
// the touchscreen's coordinate system into |display|'s coordinate system.
// The transform is also responsible for properly scaling the display if the
// display supports panel fitting.
// On X11 events are reported in framebuffer coordinate space, so the
// |framebuffer_size| is used for scaling.
// On Ozone events are reported in the touchscreen's resolution, so
// |touch_display| is used to determine the size and scale the event.
gfx::Transform GetTouchTransform(const DisplayInfo& display,
const DisplayInfo& touch_display,
const ui::TouchscreenDevice& touchscreen,
const gfx::Size& framebuffer_size) const;
// Returns the scaling factor for the touch radius such that it scales the
// radius from |touch_device|'s coordinate system to the |touch_display|'s
// coordinate system.
double GetTouchResolutionScale(
const DisplayInfo& touch_display,
const ui::TouchscreenDevice& touch_device) const;
// For the provided |display| update the touch radius mapping.
void UpdateTouchRadius(const DisplayInfo& display) const;
// For a given |target_display| and |target_display_id| update the touch
// transformation based on the touchscreen associated with |touch_display|.
// |target_display_id| is the display id whose root window will receive the
// touch events.
// |touch_display| is the physical display that has the touchscreen
// from which the events arrive.
// |target_display| provides the dimensions to which the touch event will be
// transformed.
void UpdateTouchTransform(int64_t target_display_id,
const DisplayInfo& touch_display,
const DisplayInfo& target_display) const;
} // namespace ash