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/*
* GraphLCD driver library
*
* framebuffer.h - framebuffer device
* Output goes to a framebuffer device
*
* This file is released under the GNU General Public License. Refer
* to the COPYING file distributed with this package.
*
* (c) 2004 Stephan Skrodzki
* (c) 2011 Wolfgang Astleitner <mrwastl AT users.sourceforge.net>
*/
#include <fcntl.h>
#include <stdio.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <cstdlib>
#include <cstring>
#include "common.h"
#include "config.h"
#include "framebuffer.h"
namespace GLCD
{
cDriverFramebuffer::cDriverFramebuffer(cDriverConfig * config)
: config(config),
offbuff(0),
fbfd(-1)
{
oldConfig = new cDriverConfig(*config);
}
cDriverFramebuffer::~cDriverFramebuffer()
{
delete oldConfig;
}
int cDriverFramebuffer::Init()
{
// default values
width = config->width;
if (width <= 0)
width = 320;
height = config->height;
if (height <= 0)
height = 240;
zoom = 1;
for (unsigned int i = 0; i < config->options.size(); i++)
{
if (config->options[i].name == "Zoom")
{
int z = atoi(config->options[i].value.c_str());
if (z == 0 || z == 1)
zoom = z;
else
syslog(LOG_ERR, "%s error: zoom %d not supported, using default (%d)!\n",
config->name.c_str(), z, zoom);
}
}
// Open the file for reading and writing
fbfd = open("/dev/fb0", O_RDWR);
if (1 == fbfd)
{
syslog(LOG_ERR, "%s: cannot open framebuffer device.\n", config->name.c_str());
return -1;
}
syslog(LOG_INFO, "%s: The framebuffer device was opened successfully.\n", config->name.c_str());
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))
{
syslog(LOG_ERR, "%s: Error reading fixed information.\n", config->name.c_str());
return -1;
}
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))
{
syslog(LOG_ERR, "%s: Error reading variable information.\n", config->name.c_str());
return -1;
}
// Figure out the size of the screen in bytes
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
syslog(LOG_INFO, "%s: V01: xres: %d, yres %d, vyres: %d, bpp: %d, linelenght: %d\n", config->name.c_str(),vinfo.xres,vinfo.yres,vinfo.yres_virtual,vinfo.bits_per_pixel,finfo.line_length);
// reserve another memory to draw into
offbuff = new char[screensize];
if (!offbuff)
{
syslog(LOG_ERR, "%s: failed to alloc memory for framebuffer device.\n", config->name.c_str());
return -1;
}
// Map the device to memory
fbp = mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if (fbp == MAP_FAILED)
{
syslog(LOG_ERR, "%s: failed to map framebuffer device to memory.\n", config->name.c_str());
return -1;
}
syslog(LOG_INFO, "%s: The framebuffer device was mapped to memory successfully.\n", config->name.c_str());
*oldConfig = *config;
// clear display
Refresh(true);
syslog(LOG_INFO, "%s: Framebuffer initialized.\n", config->name.c_str());
return 0;
}
int cDriverFramebuffer::DeInit()
{
if (offbuff)
delete[] offbuff;
munmap(fbp, screensize);
if (-1 != fbfd)
close(fbfd);
return 0;
}
int cDriverFramebuffer::CheckSetup()
{
if (config->device != oldConfig->device ||
config->port != oldConfig->port ||
config->width != oldConfig->width ||
config->height != oldConfig->height)
{
DeInit();
Init();
return 0;
}
if (config->upsideDown != oldConfig->upsideDown ||
config->invert != oldConfig->invert)
{
oldConfig->upsideDown = config->upsideDown;
oldConfig->invert = config->invert;
return 1;
}
return 0;
}
void cDriverFramebuffer::SetPixel(int x, int y, uint32_t data)
{
int location;
int outcol;
if (x >= width || y >= height)
return;
if (config->upsideDown)
{
x = width - 1 - x;
y = height - 1 - y;
}
// Figure out where in memory to put the pixel
location = (x*(1+zoom)+vinfo.xoffset) * (vinfo.bits_per_pixel/8) +
(y*(1+zoom)+vinfo.yoffset) * finfo.line_length;
if (data == GLCD::cColor::White) {
if (vinfo.bits_per_pixel <= 8) {
outcol = 15;
} else {
outcol = 255;
}
} else {
outcol = 0;
}
if (vinfo.bits_per_pixel <= 8)
{
*(offbuff + location) = outcol;
if (zoom == 1)
{
*(offbuff + location + 1) = outcol;
*(offbuff + location + finfo.line_length) = outcol;
*(offbuff + location + finfo.line_length + 1) = outcol;
}
}
else if (vinfo.bits_per_pixel <= 16)
{
*(offbuff + location) = outcol;
*(offbuff + location + 1) = outcol;
if (zoom == 1)
{
*(offbuff + location + 2) = outcol;
*(offbuff + location + 3) = outcol;
*(offbuff + location + finfo.line_length) = outcol;
*(offbuff + location + finfo.line_length + 1) = outcol;
*(offbuff + location + finfo.line_length + 2) = outcol;
*(offbuff + location + finfo.line_length + 3) = outcol;
}
}
else
{
*(offbuff + location) = outcol;
*(offbuff + location + 1) = outcol;
*(offbuff + location + 2) = outcol;
*(offbuff + location + 3) = 0; /* should be transparency */
if (zoom == 1)
{
*(offbuff + location + 4) = outcol;
*(offbuff + location + 5) = outcol;
*(offbuff + location + 6) = outcol;
*(offbuff + location + 7) = 0;
*(offbuff + location + finfo.line_length) = outcol;
*(offbuff + location + finfo.line_length + 1) = outcol;
*(offbuff + location + finfo.line_length + 2) = outcol;
*(offbuff + location + finfo.line_length + 3) = 0;
*(offbuff + location + finfo.line_length + 4) = outcol;
*(offbuff + location + finfo.line_length + 5) = outcol;
*(offbuff + location + finfo.line_length + 6) = outcol;
*(offbuff + location + finfo.line_length + 7) = 0;
}
}
}
void cDriverFramebuffer::Clear()
{
memset(offbuff, 0, screensize);
}
#if 0
void cDriverFramebuffer::Set8Pixels(int x, int y, unsigned char data)
{
int n;
x &= 0xFFF8;
for (n = 0; n < 8; ++n)
{
if (data & (0x80 >> n)) // if bit is set
SetPixel(x + n, y, GLCD::cColor::White);
}
}
#endif
void cDriverFramebuffer::Refresh(bool refreshAll)
{
memcpy(fbp, offbuff, screensize);
}
} // end of namespace
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