pedigree_fb.h

/*
 * 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.
 */
 
#ifndef PEDIGREE_FB_FRAMEBUFFER_H
#define PEDIGREE_FB_FRAMEBUFFER_H
 
#include <signal.h>
 
#include <cairo/cairo.h>
#include <pedigree/fb.h>
#include <sys/vt.h>
 
class Framebuffer {
 public:
  Framebuffer();
  virtual ~Framebuffer();
 
  bool initialise();
 
  bool claimTerminal();
 
  class FrameGuard {
   public:
    explicit FrameGuard(const Framebuffer& framebuffer);
    ~FrameGuard();
    explicit operator bool() const {
      return m_Active;
    }
 
   private:
    FrameGuard(const FrameGuard&) = delete;
    FrameGuard& operator=(const FrameGuard&) = delete;
    sigset_t m_PreviousMask;
    bool m_Masked;
    bool m_Active;
  };
 
  bool takeRedraw();
 
  void storeMode();
 
  void restoreMode();
 
  int enterMode(size_t desiredW, size_t desiredH, size_t desiredBpp);
 
  int useCurrentMode();
 
  void* getFramebuffer() const {
    return m_pFramebuffer;
  }
 
  void flush(size_t x, size_t y, size_t w, size_t h);
 
  cairo_format_t getFormat() const {
    return m_Format;
  }
 
  size_t getWidth() const {
    return m_Width;
  }
  size_t getHeight() const {
    return m_Height;
  }
  size_t getBytesPerLine() const {
    return m_BytesPerLine;
  }
 
 private:
  int mapMode(const pedigree_fb_mode& mode);
  static void terminalSignal(int signal);
  void releaseTerminal();
 
  void* m_pFramebuffer;
  size_t m_FramebufferSize;
 
  cairo_format_t m_Format;
 
  size_t m_Width;
  size_t m_Height;
  size_t m_BytesPerLine;
 
  int m_Fb;
 
  bool m_bStoredMode;
  pedigree_fb_mode m_StoredMode;
 
  int m_Terminal = -1;
  volatile sig_atomic_t m_TerminalActive = 1;
  volatile sig_atomic_t m_TerminalRedraw = 0;
  int m_PreviousDisplayMode = 0;
  vt_mode m_PreviousTerminalMode = {};
  struct sigaction m_PreviousReleaseAction = {};
  struct sigaction m_PreviousAcquireAction = {};
  sigset_t m_PreviousTerminalMask;
};
 
#endif