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// Copyright (c) 2015 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 "ui/gl/gl_surface_egl_x11.h"
#include "ui/events/platform/platform_event_source.h"
#include "ui/gl/egl_util.h"
extern "C" {
#include <X11/Xlib.h>
}
using ui::GetLastEGLErrorString;
using ui::PlatformEvent;
using ui::PlatformEventSource;
namespace gfx {
NativeViewGLSurfaceEGLX11::NativeViewGLSurfaceEGLX11(EGLNativeWindowType window)
: NativeViewGLSurfaceEGL(0),
parent_window_(window) {
}
bool NativeViewGLSurfaceEGLX11::InitializeNativeWindow() {
Display* x11_display = GetNativeDisplay();
XWindowAttributes attributes;
if (!XGetWindowAttributes(x11_display, parent_window_, &attributes)) {
LOG(ERROR) << "XGetWindowAttributes failed for window " << parent_window_
<< ".";
return false;
}
size_ = gfx::Size(attributes.width, attributes.height);
// Create a child window, with a CopyFromParent visual (to avoid inducing
// extra blits in the driver), that we can resize exactly in Resize(),
// correctly ordered with GL, so that we don't have invalid transient states.
// See https://crbug.com/326995.
XSetWindowAttributes swa;
memset(&swa, 0, sizeof(swa));
swa.background_pixmap = 0;
swa.bit_gravity = NorthWestGravity;
window_ = XCreateWindow(x11_display, parent_window_, 0, 0, size_.width(),
size_.height(), 0, CopyFromParent, InputOutput,
CopyFromParent, CWBackPixmap | CWBitGravity, &swa);
XMapWindow(x11_display, window_);
// The event source can be nullptr in tests, when we don't care about Exposes.
if (PlatformEventSource* source = PlatformEventSource::GetInstance()) {
XSelectInput(x11_display, window_, ExposureMask);
source->AddPlatformEventDispatcher(this);
}
XFlush(x11_display);
return true;
}
void NativeViewGLSurfaceEGLX11::Destroy() {
if (window_) {
if (PlatformEventSource* source = PlatformEventSource::GetInstance())
source->RemovePlatformEventDispatcher(this);
Display* x11_display = GetNativeDisplay();
XDestroyWindow(x11_display, window_);
window_ = 0;
XFlush(x11_display);
}
NativeViewGLSurfaceEGL::Destroy();
}
EGLConfig NativeViewGLSurfaceEGLX11::GetConfig() {
if (!config_) {
// Get a config compatible with the window
DCHECK(window_);
XWindowAttributes win_attribs;
if (!XGetWindowAttributes(GetNativeDisplay(), window_, &win_attribs)) {
return NULL;
}
// Try matching the window depth with an alpha channel,
// because we're worried the destination alpha width could
// constrain blending precision.
const int kBufferSizeOffset = 1;
const int kAlphaSizeOffset = 3;
EGLint config_attribs[] = {
EGL_BUFFER_SIZE, ~0,
EGL_ALPHA_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_RED_SIZE, 8,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
EGL_NONE
};
config_attribs[kBufferSizeOffset] = win_attribs.depth;
EGLDisplay display = GetHardwareDisplay();
EGLint num_configs;
if (!eglChooseConfig(display,
config_attribs,
&config_,
1,
&num_configs)) {
LOG(ERROR) << "eglChooseConfig failed with error "
<< GetLastEGLErrorString();
return NULL;
}
if (num_configs) {
EGLint config_depth;
if (!eglGetConfigAttrib(display,
config_,
EGL_BUFFER_SIZE,
&config_depth)) {
LOG(ERROR) << "eglGetConfigAttrib failed with error "
<< GetLastEGLErrorString();
return NULL;
}
if (config_depth == win_attribs.depth) {
return config_;
}
}
// Try without an alpha channel.
config_attribs[kAlphaSizeOffset] = 0;
if (!eglChooseConfig(display,
config_attribs,
&config_,
1,
&num_configs)) {
LOG(ERROR) << "eglChooseConfig failed with error "
<< GetLastEGLErrorString();
return NULL;
}
if (num_configs == 0) {
LOG(ERROR) << "No suitable EGL configs found.";
return NULL;
}
}
return config_;
}
bool NativeViewGLSurfaceEGLX11::Resize(const gfx::Size& size,
float scale_factor,
bool has_alpha) {
if (size == GetSize())
return true;
size_ = size;
eglWaitGL();
XResizeWindow(GetNativeDisplay(), window_, size.width(), size.height());
eglWaitNative(EGL_CORE_NATIVE_ENGINE);
return true;
}
bool NativeViewGLSurfaceEGLX11::CanDispatchEvent(const PlatformEvent& event) {
return event->type == Expose && event->xexpose.window == window_;
}
uint32_t NativeViewGLSurfaceEGLX11::DispatchEvent(const PlatformEvent& event) {
XEvent x_event = *event;
x_event.xexpose.window = parent_window_;
Display* x11_display = GetNativeDisplay();
XSendEvent(x11_display, parent_window_, False, ExposureMask, &x_event);
XFlush(x11_display);
return ui::POST_DISPATCH_STOP_PROPAGATION;
}
NativeViewGLSurfaceEGLX11::~NativeViewGLSurfaceEGLX11() {
Destroy();
}
} // namespace gfx
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