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