util-linux.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef TARGET_LINUX

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <string.h>
#include <sys/mman.h>
#include <syslog.h>
#include <unistd.h>

#include <SDL/SDL.h>

#include "util.h"

size_t SharedBuffer::m_NextId = 0;

Framebuffer::Framebuffer()
    : m_pFramebuffer(0), m_FramebufferSize(0), m_Format(), m_Width(0),
      m_Height(0), m_pScreen(0), m_pBackbuffer(0)
{
}

Framebuffer::~Framebuffer()
{
    SDL_FreeSurface(m_pBackbuffer);
}

bool Framebuffer::initialise()
{
    return true;
}

void Framebuffer::storeMode()
{
    // no-op for SDL
}

void Framebuffer::restoreMode()
{
    // no-op for SDL
}

int Framebuffer::enterMode(size_t desiredW, size_t desiredH, size_t desiredBpp)
{
    m_pScreen = SDL_SetVideoMode(
        desiredW, desiredH, desiredBpp, SDL_DOUBLEBUF | SDL_SWSURFACE);

    m_pBackbuffer = SDL_CreateRGBSurface(
        SDL_DOUBLEBUF | SDL_SWSURFACE, desiredW, desiredH, 32, 0x00FF0000,
        0x0000FF00, 0x000000FF, 0);

    m_pFramebuffer = (void *) m_pBackbuffer->pixels;

    m_Width = m_pScreen->w;
    m_Height = m_pScreen->h;
    m_Format = CAIRO_FORMAT_RGB24;

    return 0;
}

void Framebuffer::flush(size_t x, size_t y, size_t w, size_t h)
{
    // Don't bother doing a dirty rectangle flush just yet.
    SDL_BlitSurface(m_pBackbuffer, NULL, m_pScreen, NULL);
    SDL_Flip(m_pScreen);
}

SharedBuffer::SharedBuffer(size_t size)
    : m_ShmName(), m_ShmFd(-1), m_pBuffer(0), m_Size(size)
{
    size_t bufferId = m_NextId++;

    memset(m_ShmName, 0, sizeof m_ShmName);
    sprintf(m_ShmName, "wm%zd", bufferId);

    m_ShmFd = shm_open(m_ShmName, O_RDWR | O_CREAT, 0777);
    syslog(LOG_INFO, "opening shm %s [fd=%d]", m_ShmName, m_ShmFd);
    int r = ftruncate(m_ShmFd, size);
    assert(r == 0);

    m_pBuffer = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, m_ShmFd, 0);
}

SharedBuffer::SharedBuffer(size_t size, void *handle)
    : m_ShmName(), m_ShmFd(-1), m_pBuffer(0), m_Size(size)
{
    memcpy(m_ShmName, &handle, 8);

    m_ShmFd = shm_open(m_ShmName, O_RDWR, 0777);
    syslog(LOG_INFO, "opening client shm %s [fd=%d]", m_ShmName, m_ShmFd);

    m_pBuffer = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, m_ShmFd, 0);
}

SharedBuffer::~SharedBuffer()
{
    syslog(LOG_INFO, "unmapping %zd bytes @%p", m_Size, m_pBuffer);
    munmap(m_pBuffer, m_Size);
    close(m_ShmFd);
    shm_unlink(m_ShmName);
}

void *SharedBuffer::getHandle()
{
    uint64_t v = 0;
    memcpy(&v, m_ShmName, 8);
    return (void *) v;
}

void *SharedBuffer::getBuffer()
{
    return m_pBuffer;
}

#endif