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// Copyright (c) 2012 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.
#ifndef UI_BASE_X_X11_UTIL_H_
#define UI_BASE_X_X11_UTIL_H_
// This file declares utility functions for X11 (Linux only).
// These functions do not require the Xlib headers to be included (which is why
// we use a void* for Visual*). The Xlib headers are highly polluting so we try
// hard to limit their spread into the rest of the code.
#include <stddef.h>
#include <string>
#include <vector>
#include "base/event_types.h"
#include "base/macros.h"
#include "base/memory/ref_counted_memory.h"
#include "ui/base/x/ui_base_x_export.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/gfx/x/x11_types.h"
typedef unsigned long XSharedMemoryId; // ShmSeg in the X headers.
typedef unsigned long Cursor;
namespace gfx {
class Canvas;
class Insets;
class Point;
class Rect;
class SkBitmap;
namespace ui {
// These constants are defined in the EWMH spec for _NET_WM_MOVERESIZE.
enum class NetWmMoveResize {
MOVE = 8, // movement only
SIZE_KEYBOARD = 9, // size via keyboard
MOVE_KEYBOARD = 10, // move via keyboard
CANCEL = 11, // cancel operation
// These functions use the default display and this /must/ be called from
// the UI thread. Thus, they don't support multiple displays.
// These functions cache their results ---------------------------------
// Returns true if the system supports XINPUT2.
UI_BASE_X_EXPORT bool IsXInput2Available();
// Return true iff the display supports Xrender
UI_BASE_X_EXPORT bool QueryRenderSupport(XDisplay* dpy);
// Returns an X11 Cursor, sharable across the process.
// |cursor_shape| is an X font cursor shape, see XCreateFontCursor().
UI_BASE_X_EXPORT::Cursor GetXCursor(int cursor_shape);
// Creates a custom X cursor from the image. This takes ownership of image. The
// caller must not free/modify the image. The refcount of the newly created
// cursor is set to 1.
UI_BASE_X_EXPORT::Cursor CreateReffedCustomXCursor(XcursorImage* image);
// Increases the refcount of the custom cursor.
UI_BASE_X_EXPORT void RefCustomXCursor(::Cursor cursor);
// Decreases the refcount of the custom cursor, and destroys it if it reaches 0.
UI_BASE_X_EXPORT void UnrefCustomXCursor(::Cursor cursor);
// Creates a XcursorImage and copies the SkBitmap |bitmap| on it. |bitmap|
// should be non-null. Caller owns the returned object.
UI_BASE_X_EXPORT XcursorImage* SkBitmapToXcursorImage(
const SkBitmap* bitmap,
const gfx::Point& hotspot);
// Coalesce all pending motion events (touch or mouse) that are at the top of
// the queue, and return the number eliminated, storing the last one in
// |last_event|.
UI_BASE_X_EXPORT int CoalescePendingMotionEvents(const XEvent* xev,
XEvent* last_event);
// Hides the host cursor.
UI_BASE_X_EXPORT void HideHostCursor();
// Returns an invisible cursor.
UI_BASE_X_EXPORT::Cursor CreateInvisibleCursor();
// Sets whether |window| should use the OS window frame.
UI_BASE_X_EXPORT void SetUseOSWindowFrame(XID window, bool use_os_window_frame);
// Requests the window manager move or resize the window on behalf of Chromium.
// Clients MUST release all grabs prior to calling. Callers must check that the
// WM supports the _NET_WM_MOVERESIZE protocol.
UI_BASE_X_EXPORT void MoveResizeManagedWindow(XID window,
gfx::Point root_location,
NetWmMoveResize mode);
// These functions do not cache their results --------------------------
// Returns true if the shape extension is supported.
UI_BASE_X_EXPORT bool IsShapeExtensionAvailable();
// Get the X window id for the default root window
UI_BASE_X_EXPORT XID GetX11RootWindow();
// Returns the user's current desktop.
UI_BASE_X_EXPORT bool GetCurrentDesktop(int* desktop);
enum HideTitlebarWhenMaximized {
UI_BASE_X_EXPORT void SetHideTitlebarWhenMaximizedProperty(
XID window,
HideTitlebarWhenMaximized property);
// Clears all regions of X11's default root window by filling black pixels.
UI_BASE_X_EXPORT void ClearX11DefaultRootWindow();
// Returns true if |window| is visible.
UI_BASE_X_EXPORT bool IsWindowVisible(XID window);
// Returns the inner bounds of |window| (excluding the non-client area).
UI_BASE_X_EXPORT bool GetInnerWindowBounds(XID window, gfx::Rect* rect);
// Returns the non-client area extents of |window|. This is a negative inset; it
// represents the negative size of the window border on all sides.
// InnerWindowBounds.Inset(WindowExtents) = OuterWindowBounds.
// Returns false if the window manager does not provide extents information.
UI_BASE_X_EXPORT bool GetWindowExtents(XID window, gfx::Insets* extents);
// Returns the outer bounds of |window| (including the non-client area).
UI_BASE_X_EXPORT bool GetOuterWindowBounds(XID window, gfx::Rect* rect);
// Returns true if |window| contains the point |screen_loc|.
UI_BASE_X_EXPORT bool WindowContainsPoint(XID window, gfx::Point screen_loc);
// Return true if |window| has any property with |property_name|.
UI_BASE_X_EXPORT bool PropertyExists(XID window,
const std::string& property_name);
// Returns the raw bytes from a property with minimal
// interpretation. |out_data| should be freed by XFree() after use.
UI_BASE_X_EXPORT bool GetRawBytesOfProperty(
XID window,
XAtom property,
scoped_refptr<base::RefCountedMemory>* out_data,
size_t* out_data_items,
XAtom* out_type);
// Get the value of an int, int array, atom array or string property. On
// success, true is returned and the value is stored in |value|.
// TODO(erg): Once we remove the gtk port and are 100% aura, all of these
// should accept an XAtom instead of a string.
UI_BASE_X_EXPORT bool GetIntProperty(XID window,
const std::string& property_name,
int* value);
UI_BASE_X_EXPORT bool GetXIDProperty(XID window,
const std::string& property_name,
XID* value);
UI_BASE_X_EXPORT bool GetIntArrayProperty(XID window,
const std::string& property_name,
std::vector<int>* value);
UI_BASE_X_EXPORT bool GetAtomArrayProperty(XID window,
const std::string& property_name,
std::vector<XAtom>* value);
UI_BASE_X_EXPORT bool GetStringProperty(XID window,
const std::string& property_name,
std::string* value);
// These setters all make round trips.
UI_BASE_X_EXPORT bool SetIntProperty(XID window,
const std::string& name,
const std::string& type,
int value);
UI_BASE_X_EXPORT bool SetIntArrayProperty(XID window,
const std::string& name,
const std::string& type,
const std::vector<int>& value);
UI_BASE_X_EXPORT bool SetAtomProperty(XID window,
const std::string& name,
const std::string& type,
XAtom value);
UI_BASE_X_EXPORT bool SetAtomArrayProperty(XID window,
const std::string& name,
const std::string& type,
const std::vector<XAtom>& value);
UI_BASE_X_EXPORT bool SetStringProperty(XID window,
XAtom property,
XAtom type,
const std::string& value);
// Gets the X atom for default display corresponding to atom_name.
UI_BASE_X_EXPORT XAtom GetAtom(const char* atom_name);
// Sets the WM_CLASS attribute for a given X11 window.
UI_BASE_X_EXPORT void SetWindowClassHint(XDisplay* display,
XID window,
const std::string& res_name,
const std::string& res_class);
// Sets the WM_WINDOW_ROLE attribute for a given X11 window.
UI_BASE_X_EXPORT void SetWindowRole(XDisplay* display,
XID window,
const std::string& role);
// Determine whether we should default to native decorations or the custom
// frame based on the currently-running window manager.
UI_BASE_X_EXPORT bool GetCustomFramePrefDefault();
static const int kAllDesktops = -1;
// Queries the desktop |window| is on, kAllDesktops if sticky. Returns false if
// property not found.
UI_BASE_X_EXPORT bool GetWindowDesktop(XID window, int* desktop);
// Translates an X11 error code into a printable string.
UI_BASE_X_EXPORT std::string GetX11ErrorString(XDisplay* display, int err);
// Implementers of this interface receive a notification for every X window of
// the main display.
class EnumerateWindowsDelegate {
// |xid| is the X Window ID of the enumerated window. Return true to stop
// further iteration.
virtual bool ShouldStopIterating(XID xid) = 0;
virtual ~EnumerateWindowsDelegate() {}
// Enumerates all windows in the current display. Will recurse into child
// windows up to a depth of |max_depth|.
UI_BASE_X_EXPORT bool EnumerateAllWindows(EnumerateWindowsDelegate* delegate,
int max_depth);
// Enumerates the top-level windows of the current display.
UI_BASE_X_EXPORT void EnumerateTopLevelWindows(
ui::EnumerateWindowsDelegate* delegate);
// Returns all children windows of a given window in top-to-bottom stacking
// order.
UI_BASE_X_EXPORT bool GetXWindowStack(XID window, std::vector<XID>* windows);
// Copies |source_bounds| from |drawable| to |canvas| at offset |dest_offset|.
// |source_bounds| is in physical pixels, while |dest_offset| is relative to
// the canvas's scale. Note that this function is slow since it uses
// XGetImage() to copy the data from the X server to this process before
// copying it to |canvas|.
UI_BASE_X_EXPORT bool CopyAreaToCanvas(XID drawable,
gfx::Rect source_bounds,
gfx::Point dest_offset,
gfx::Canvas* canvas);
enum WindowManagerName {
// Attempts to guess the window maager. Returns WM_UNKNOWN if we can't
// determine it for one reason or another.
UI_BASE_X_EXPORT WindowManagerName GuessWindowManager();
// The same as GuessWindowManager(), but returns the raw string. If we
// can't determine it, return "Unknown".
UI_BASE_X_EXPORT std::string GuessWindowManagerName();
// Enable the default X error handlers. These will log the error and abort
// the process if called. Use SetX11ErrorHandlers() from x11_util_internal.h
// to set your own error handlers.
UI_BASE_X_EXPORT void SetDefaultX11ErrorHandlers();
// Returns true if a given window is in full-screen mode.
UI_BASE_X_EXPORT bool IsX11WindowFullScreen(XID window);
// Returns true if the window manager supports the given hint.
UI_BASE_X_EXPORT bool WmSupportsHint(XAtom atom);
// Manages a piece of X11 allocated memory as a RefCountedMemory segment. This
// object takes ownership over the passed in memory and will free it with the
// X11 allocator when done.
class UI_BASE_X_EXPORT XRefcountedMemory : public base::RefCountedMemory {
XRefcountedMemory(unsigned char* x11_data, size_t length);
// Overridden from RefCountedMemory:
const unsigned char* front() const override;
size_t size() const override;
~XRefcountedMemory() override;
gfx::XScopedPtr<unsigned char> x11_data_;
size_t length_;
// Keeps track of a cursor returned by an X function and makes sure it's
// XFreeCursor'd.
class UI_BASE_X_EXPORT XScopedCursor {
// Keeps track of |cursor| created with |display|.
XScopedCursor(::Cursor cursor, XDisplay* display);
::Cursor get() const;
void reset(::Cursor cursor);
::Cursor cursor_;
XDisplay* display_;
namespace test {
// Resets the cache used by GetXCursor(). Only useful for tests that may delete
// the display.
UI_BASE_X_EXPORT void ResetXCursorCache();
// Returns the cached XcursorImage for |cursor|.
UI_BASE_X_EXPORT const XcursorImage* GetCachedXcursorImage(::Cursor cursor);
} // namespace test
} // namespace ui
#endif // UI_BASE_X_X11_UTIL_H_