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// Copyright (c) 2011 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.
// This file declares utility functions for X11 (Linux only).
// These functions require the inclusion of the Xlib headers. Since the Xlib
// headers pollute so much of the namespace, this should only be included
// when needed.
extern "C" {
#include <X11/extensions/Xrender.h>
#include <X11/extensions/XShm.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <memory>
#include <unordered_map>
#include "base/macros.h"
#include "build/build_config.h"
#include "ui/base/x/ui_base_x_export.h"
#include "ui/gfx/x/x11_types.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
namespace ui {
// --------------------------------------------------------------------------
// NOTE: these functions cache the results and must be called from the UI
// thread.
// Get the XRENDER format id for ARGB32 (Skia's format).
// NOTE:Currently this don't support multiple screens/displays.
UI_BASE_X_EXPORT XRenderPictFormat* GetRenderARGB32Format(Display* dpy);
// --------------------------------------------------------------------------
// X11 error handling.
// Sets the X Error Handlers. Passing NULL for either will enable the default
// error handler, which if called will log the error and abort the process.
UI_BASE_X_EXPORT void SetX11ErrorHandlers(XErrorHandler error_handler,
XIOErrorHandler io_error_handler);
// NOTE: This function should not be called directly from the
// X11 Error handler because it queries the server to decode the
// error message, which may trigger other errors. A suitable workaround
// is to post a task in the error handler to call this function.
UI_BASE_X_EXPORT void LogErrorEventDescription(Display* dpy,
const XErrorEvent& error_event);
// --------------------------------------------------------------------------
// Selects a visual with a preference for alpha support on compositing window
// managers.
#if !defined(OS_CHROMEOS)
class UI_BASE_X_EXPORT XVisualManager {
static XVisualManager* GetInstance();
void ChooseVisualForWindow(bool want_argb_visual,
Visual** visual,
int* depth,
Colormap* colormap,
bool* using_argb_visual);
// Called by GpuDataManagerImplPrivate when GPUInfo becomes available. It is
// necessary for the GPU process to find out which visuals are best for GL
// because we don't want to load GL in the browser process. Returns false iff
// |default_visual_id| or |transparent_visual_id| are invalid.
bool OnGPUInfoChanged(bool software_rendering,
VisualID default_visual_id,
VisualID transparent_visual_id);
friend struct base::DefaultSingletonTraits<XVisualManager>;
class XVisualData {
explicit XVisualData(XVisualInfo visual_info);
Colormap GetColormap();
const XVisualInfo visual_info;
Colormap colormap_;
std::unordered_map<VisualID, std::unique_ptr<XVisualData>> visuals_;
XDisplay* display_;
VisualID system_visual_id_;
VisualID transparent_visual_id_;
bool using_compositing_wm_;
bool using_software_rendering_;
bool have_gpu_argb_visual_;
} // namespace ui