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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "FrameBufferX11.hpp"
#include "libX11.hpp"
#include "Common/Timer.hpp"
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
namespace sw
{
static int (*PreviousXErrorHandler)(Display *display, XErrorEvent *event) = 0;
static bool shmBadAccess = false;
// Catches BadAcces errors so we can fall back to not using MIT-SHM
static int XShmErrorHandler(Display *display, XErrorEvent *event)
{
if(event->error_code == BadAccess)
{
shmBadAccess = true;
return 0;
}
else
{
return PreviousXErrorHandler(display, event);
}
}
FrameBufferX11::FrameBufferX11(Display *display, Window window, int width, int height) : FrameBuffer(width, height, false, false), ownX11(!display), x_display(display), x_window(window)
{
if(!x_display)
{
x_display = libX11->XOpenDisplay(0);
assert(x_display);
}
int screen = DefaultScreen(x_display);
x_gc = libX11->XDefaultGC(x_display, screen);
int depth = libX11->XDefaultDepth(x_display, screen);
XVisualInfo x_visual;
Status status = libX11->XMatchVisualInfo(x_display, screen, 32, TrueColor, &x_visual);
bool match = (status != 0 && x_visual.blue_mask == 0xFF); // Prefer X8R8G8B8
Visual *visual = match ? x_visual.visual : libX11->XDefaultVisual(x_display, screen);
mit_shm = (libX11->XShmQueryExtension && libX11->XShmQueryExtension(x_display) == True);
if(mit_shm)
{
x_image = libX11->XShmCreateImage(x_display, visual, depth, ZPixmap, 0, &shminfo, width, height);
shminfo.shmid = shmget(IPC_PRIVATE, x_image->bytes_per_line * x_image->height, IPC_CREAT | SHM_R | SHM_W);
shminfo.shmaddr = x_image->data = (char*)shmat(shminfo.shmid, 0, 0);
shminfo.readOnly = False;
PreviousXErrorHandler = libX11->XSetErrorHandler(XShmErrorHandler);
libX11->XShmAttach(x_display, &shminfo); // May produce a BadAccess error
libX11->XSync(x_display, False);
libX11->XSetErrorHandler(PreviousXErrorHandler);
if(shmBadAccess)
{
mit_shm = false;
XDestroyImage(x_image);
shmdt(shminfo.shmaddr);
shmctl(shminfo.shmid, IPC_RMID, 0);
shmBadAccess = false;
}
}
if(!mit_shm)
{
int bytes_per_line = width * 4;
int bytes_per_image = height * bytes_per_line;
char *buffer = (char*)malloc(bytes_per_image);
memset(buffer, 0, bytes_per_image);
x_image = libX11->XCreateImage(x_display, visual, depth, ZPixmap, 0, buffer, width, height, 32, bytes_per_line);
assert(x_image);
if(!x_image)
{
free(buffer);
}
}
}
FrameBufferX11::~FrameBufferX11()
{
if(!mit_shm)
{
XDestroyImage(x_image);
}
else
{
libX11->XShmDetach(x_display, &shminfo);
XDestroyImage(x_image);
shmdt(shminfo.shmaddr);
shmctl(shminfo.shmid, IPC_RMID, 0);
}
if(ownX11)
{
libX11->XCloseDisplay(x_display);
}
}
void *FrameBufferX11::lock()
{
if(x_image)
{
stride = x_image->bytes_per_line;
framebuffer = x_image->data;
}
return framebuffer;
}
void FrameBufferX11::unlock()
{
framebuffer = nullptr;
}
void FrameBufferX11::blit(sw::Surface *source, const Rect *sourceRect, const Rect *destRect)
{
copy(source);
if(!mit_shm)
{
libX11->XPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height);
}
else
{
libX11->XShmPutImage(x_display, x_window, x_gc, x_image, 0, 0, 0, 0, width, height, False);
}
libX11->XSync(x_display, False);
if(false) // Draw the framerate on screen
{
static double fpsTime = sw::Timer::seconds();
static int frames = -1;
double time = sw::Timer::seconds();
double delta = time - fpsTime;
frames++;
static double FPS = 0.0;
static double maxFPS = 0.0;
if(delta > 1.0)
{
FPS = frames / delta;
fpsTime = time;
frames = 0;
if(FPS > maxFPS)
{
maxFPS = FPS;
}
}
char string[256];
sprintf(string, "FPS: %.2f (max: %.2f)", FPS, maxFPS);
libX11->XDrawString(x_display, x_window, x_gc, 50, 50, string, strlen(string));
}
}
}
// Chromium can be built with USE_X11 && USE_OZONE. In case of pure USE_X11 builds, we can use this path.
// In another case, the decision what framebuffer to create will be done by the FrameBufferFactoryOzone.
#if !defined(USE_OZONE)
NO_SANITIZE_FUNCTION sw::FrameBuffer *createFrameBuffer(void *display, Window window, int width, int height)
{
return new sw::FrameBufferX11((::Display*)display, window, width, height);
}
#endif