/*
droid VNC server  - a vnc server for android
Copyright (C) 2011 Jose Pereira <onaips@gmail.com>

Other contributors:
Oleksandr Andrushchenko <andr2000@gmail.com>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "framebuffer_method.h"
#include "common.h"
#include "gui.h"

int fbfd = -1;


char framebuffer_device[256] = "/dev/graphics/fb0";


void setFramebufferDevice(char *s)
{
  strcpy(framebuffer_device,s);
}


int initFramebuffer(void)
{  
  L("--Initializing framebuffer access method--\n");
  
    fbmmap = MAP_FAILED;
       
    if ((fbfd = open(framebuffer_device, O_RDWR)) == -1)
    { 
        L("Cannot open fb device %s\n", framebuffer_device);
	sendMsgToGui("~SHOW|Cannot open fb device, please try out other display grab method\n");
        return -1;
    }
         
    update_fb_info();
        
        
    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &fscrinfo) != 0)
    {
    L("ioctl error\n");
    return -1;
    }
    
    L("line_lenght=%d xres=%d, yres=%d, xresv=%d, yresv=%d, xoffs=%d, yoffs=%d, bpp=%d\n",
                        (int)fscrinfo.line_length,(int)scrinfo.xres, (int)scrinfo.yres,
                        (int)scrinfo.xres_virtual, (int)scrinfo.yres_virtual,
                        (int)scrinfo.xoffset, (int)scrinfo.yoffset,
                        (int)scrinfo.bits_per_pixel);
     


      
    size_t size=scrinfo.yres_virtual;
    if (size<scrinfo.yres*2)
    {
        L("Using Droid workaround\n");
	size=scrinfo.yres*2;
    }
    
    if ((scrinfo.bits_per_pixel==24))// && (fscrinfo.line_length/scrinfo.xres_virtual==CHAR_BIT*4))
    {
      scrinfo.bits_per_pixel=32;
     
      L("24-bit XRGB display detected\n");
    }
    
    size_t fbSize = roundUpToPageSize(fscrinfo.line_length * size);

    fbmmap = mmap(NULL, fbSize , PROT_READ|PROT_WRITE ,  MAP_SHARED , fbfd, 0);
          
    if (fbmmap == MAP_FAILED)
    { 
        L("mmap failed\n");
	sendMsgToGui("~SHOW|Framebuffer mmap failed, please try out other display grab method\n");
        return -1;
    } 
    
    displayInfo.bpp = scrinfo.bits_per_pixel;
    displayInfo.size = scrinfo.xres * scrinfo.yres * scrinfo.bits_per_pixel / CHAR_BIT;
    displayInfo.width = scrinfo.xres;
    displayInfo.height = scrinfo.yres;
    displayInfo.red_offset = scrinfo.red.offset;
    displayInfo.red_length = scrinfo.red.length;
    displayInfo.green_offset = scrinfo.green.offset;
    displayInfo.green_length = scrinfo.green.length;
    displayInfo.blue_offset = scrinfo.blue.offset;
    displayInfo.blue_length = scrinfo.blue.length;
    displayInfo.alpha_offset = scrinfo.transp.offset;
    displayInfo.alpha_length = scrinfo.transp.length;
  
    return 1;
} 
 
void cleanupFramebuffer(void) 
{
    if(fbfd != -1)
    {
        close(fbfd);
    } 
} 



void update_fb_info()      
{  
       
  if (ioctl(fbfd, FBIOGET_VSCREENINFO, &scrinfo) != 0)
  {
      L("ioctl error\n");
      sendMsgToGui("~SHOW|Framebuffer ioctl error, please try out other display grab method\n");
      exit(EXIT_FAILURE);
  } 
} 

   
inline int roundUpToPageSize(int x) {
    return (x + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1);
}