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drv_Image.c

/* $Id: drv_Image.c,v 1.12 2005/05/08 04:32:44 reinelt Exp $
 *
 * new style Image (PPM/PNG) Driver for LCD4Linux 
 *
 * Copyright (C) 2003 Michael Reinelt <reinelt@eunet.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: drv_Image.c,v $
 * Revision 1.12  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.11  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.10  2004/11/29 04:42:07  reinelt
 * removed the 99999 msec limit on widget update time (thanks to Petri Damsten)
 *
 * Revision 1.9  2004/06/26 12:04:59  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.8  2004/06/26 09:27:20  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.7  2004/06/20 10:09:54  reinelt
 *
 * 'const'ified the whole source
 *
 * Revision 1.6  2004/06/19 08:20:19  reinelt
 *
 * compiler warning in image driver fixed
 * bar bug in USBLCD driver fixed
 *
 * Revision 1.5  2004/06/06 06:51:59  reinelt
 *
 * do not display end splash screen if quiet=1
 *
 * Revision 1.4  2004/06/02 09:41:19  reinelt
 *
 * prepared support for startup splash screen
 *
 * Revision 1.3  2004/05/31 06:24:42  reinelt
 *
 * fixed symlink security issue with the image driver
 *
 * Revision 1.2  2004/05/29 23:30:20  reinelt
 *
 * fixed a compiler issue with drv_Image.c (thanks to Frank Stratmann)
 *
 * Revision 1.1  2004/05/25 14:27:21  reinelt
 *
 * added drv_Image.c (this time really!)
 *
 */

/* 
 *
 * exported fuctions:
 *
 * struct DRIVER drv_Image
 *
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <sys/time.h>

#ifdef WITH_PNG
#ifdef HAVE_GD_GD_H
#include <gd/gd.h>
#else
#ifdef HAVE_GD_H
#include <gd.h>
#else
#error "gd.h not found!"
#error "cannot compile PNG driver"
#endif
#endif
#endif


#include "debug.h"
#include "cfg.h"
#include "timer.h"
#include "qprintf.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
#include "widget_icon.h"
#include "widget_bar.h"
#include "drv.h"
#include "drv_generic_graphic.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

static char Name[] = "Image";

static enum { PPM, PNG } Format;

static unsigned int fg_col, bg_col, hg_col;

static int pixel = -1;        /* pointsize in pixel */
static int pgap = 0;          /* gap between points */
static int rgap = 0;          /* row gap between lines */
static int cgap = 0;          /* column gap between characters */
static int border = 0;        /* window border */

static int dimx, dimy;        /* total window dimension in pixel */

static unsigned char *drv_IMG_FB = NULL;

static int dirty = 1;

/****************************************/
/***  hardware dependant functions    ***/
/****************************************/

#ifdef WITH_PPM
static int drv_IMG_flush_PPM(void)
{
    static int seq = 0;
    static unsigned char *bitbuf = NULL;
    static unsigned char *rowbuf = NULL;
    int xsize, ysize, row, col;
    unsigned char R[3], G[3], B[3];
    char path[256], tmp[256], buffer[256];
    int fd;

    xsize = 2 * border + (DCOLS / XRES - 1) * cgap + DCOLS * pixel + (DCOLS - 1) * pgap;
    ysize = 2 * border + (DROWS / YRES - 1) * rgap + DROWS * pixel + (DROWS - 1) * pgap;

    if (bitbuf == NULL) {
      if ((bitbuf = malloc(xsize * ysize * sizeof(*bitbuf))) == NULL) {
          error("%s: malloc(%d) failed: %s", Name, xsize * ysize * sizeof(*bitbuf), strerror(errno));
          return -1;
      }
    }

    if (rowbuf == NULL) {
      if ((rowbuf = malloc(3 * xsize * sizeof(*rowbuf))) == NULL) {
          error("Raster: malloc(%d) failed: %s", 3 * xsize * sizeof(*rowbuf), strerror(errno));
          return -1;
      }
    }

    memset(bitbuf, 0, xsize * ysize * sizeof(*bitbuf));

    for (row = 0; row < DROWS; row++) {
      int y = border + (row / YRES) * rgap + row * (pixel + pgap);
      for (col = 0; col < DCOLS; col++) {
          int x = border + (col / XRES) * cgap + col * (pixel + pgap);
          int a, b;
          for (a = 0; a < pixel; a++)
            for (b = 0; b < pixel; b++)
                bitbuf[y * xsize + x + a * xsize + b] = drv_IMG_FB[row * DCOLS + col] + 1;
      }
    }

    snprintf(path, sizeof(path), output, seq++);
    qprintf(tmp, sizeof(tmp), "%s.tmp", path);

    /* remove the file */
    unlink(tmp);

    /* avoid symlink security hole:  */
    /* open it with O_EXCL will fail if the file exists.  */
    /* This should not happen because we just unlinked it. */
    if ((fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0644)) < 0) {
      error("%s: open(%s) failed: %s", Name, tmp, strerror(errno));
      return -1;
    }

    qprintf(buffer, sizeof(buffer), "P6\n%d %d\n255\n", xsize, ysize);
    if (write(fd, buffer, strlen(buffer)) < 0) {
      error("%s: write(%s) failed: %s", Name, tmp, strerror(errno));
      return -1;
    }

    R[0] = 0xff & bg_col >> 16;
    G[0] = 0xff & bg_col >> 8;
    B[0] = 0xff & bg_col;

    R[1] = 0xff & hg_col >> 16;
    G[1] = 0xff & hg_col >> 8;
    B[1] = 0xff & hg_col;

    R[2] = 0xff & fg_col >> 16;
    G[2] = 0xff & fg_col >> 8;
    B[2] = 0xff & fg_col;

    for (row = 0; row < ysize; row++) {
      int c = 0;
      for (col = 0; col < xsize; col++) {
          int i = bitbuf[row * xsize + col];
          rowbuf[c++] = R[i];
          rowbuf[c++] = G[i];
          rowbuf[c++] = B[i];
      }
      if (write(fd, rowbuf, c) < 0) {
          error("%s: write(%s) failed: %s", Name, tmp, strerror(errno));
          break;
      }
    }

    if (close(fd) < 0) {
      error("%s: close(%s) failed: %s", Name, tmp, strerror(errno));
      return -1;
    }
    if (rename(tmp, path) < 0) {
      error("%s: rename(%s) failed: %s", Name, tmp, strerror(errno));
      return -1;
    }

    return 0;
}
#endif

#ifdef WITH_PNG
static int drv_IMG_flush_PNG(void)
{
    static int seq = 0;
    int xsize, ysize, row, col;
    char path[256], tmp[256];
    FILE *fp;
    int fd;
    gdImagePtr im;
    int bg, hg, fg;

    xsize = 2 * border + (DCOLS / XRES - 1) * cgap + DCOLS * pixel + (DCOLS - 1) * pgap;
    ysize = 2 * border + (DROWS / YRES - 1) * rgap + DROWS * pixel + (DROWS - 1) * pgap;

    im = gdImageCreate(xsize, ysize);

    /* first color = background */
    bg = gdImageColorAllocate(im, 0xff & bg_col >> 16, 0xff & bg_col >> 8, 0xff & bg_col);

    hg = gdImageColorAllocate(im, 0xff & hg_col >> 16, 0xff & hg_col >> 8, 0xff & hg_col);


    fg = gdImageColorAllocate(im, 0xff & fg_col >> 16, 0xff & fg_col >> 8, 0xff & fg_col);


    for (row = 0; row < DROWS; row++) {
      int y = border + (row / YRES) * rgap + row * (pixel + pgap);
      for (col = 0; col < DCOLS; col++) {
          int x = border + (col / XRES) * cgap + col * (pixel + pgap);
          gdImageFilledRectangle(im, x, y, x + pixel - 1, y + pixel - 1, drv_IMG_FB[row * DCOLS + col] ? fg : hg);
      }
    }

    snprintf(path, sizeof(path), output, seq++);
    qprintf(tmp, sizeof(tmp), "%s.tmp", path);

    /* remove the file */
    unlink(tmp);

    /* avoid symlink security hole:  */
    /* open it with O_EXCL will fail if the file exists.  */
    /* This should not happen because we just unlinked it. */
    if ((fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0644)) < 0) {
      error("%s: open(%s) failed: %s", Name, tmp, strerror(errno));
      return -1;
    }

    if ((fp = fdopen(fd, "w")) == NULL) {
      error("%s: fdopen(%s) failed: %s\n", Name, tmp, strerror(errno));
      close(fd);
      return -1;
    }

    gdImagePng(im, fp);
    gdImageDestroy(im);


    if (fclose(fp) != 0) {
      error("%s: fclose(%s) failed: %s\n", Name, tmp, strerror(errno));
      return -1;
    }

    if (rename(tmp, path) < 0) {
      error("%s: rename(%s) failed: %s\n", Name, tmp, strerror(errno));
      return -1;
    }

    return 0;
}
#endif


static void drv_IMG_flush(void)
{
    switch (Format) {
    case PPM:
#ifdef WITH_PPM
      drv_IMG_flush_PPM();
#endif
      break;
    case PNG:
#ifdef WITH_PNG
      drv_IMG_flush_PNG();
#endif
      break;
    }
}


static void drv_IMG_timer(void *notused)
{
    /* avoid compiler warning */
    notused = notused;

    if (dirty) {
      drv_IMG_flush();
      dirty = 0;
    }
}


static void drv_IMG_blit(const int row, const int col, const int height, const int width)
{
    int r, c;

    for (r = row; r < row + height && r < DROWS; r++) {
      for (c = col; c < col + width && c < DCOLS; c++) {
          unsigned char p = drv_generic_graphic_FB[r * LCOLS + c];
          if (drv_IMG_FB[r * DCOLS + c] != p) {
            drv_IMG_FB[r * DCOLS + c] = p;
            dirty = 1;
          }
      }
    }
}


static int drv_IMG_start(const char *section)
{
    char *s;

    if (output == NULL || *output == '\0') {
      error("%s: no output file specified (use -o switch)", Name);
      return -1;
    }

    /* read file format from config */
    s = cfg_get(section, "Format", NULL);
    if (s == NULL || *s == '\0') {
      error("%s: no '%s.Format' entry from %s", Name, section, cfg_source());
      free(s);
      return -1;
    }

    if (strcmp(s, "PPM") == 0) {
      Format = PPM;
    } else if (strcmp(s, "PNG") == 0) {
      Format = PNG;
    } else {
      error("%s: bad %s.Format '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    /* read display size from config */
    if (sscanf(s = cfg_get(section, "Size", "120x32"), "%dx%d", &DCOLS, &DROWS) != 2 || DCOLS < 1 || DROWS < 1) {
      error("%s: bad %s.Size '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (sscanf(s = cfg_get(section, "font", "5x8"), "%dx%d", &XRES, &YRES) != 2 || XRES < 1 || YRES < 1) {
      error("%s: bad %s.Font '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (sscanf(s = cfg_get(section, "pixel", "4+1"), "%d+%d", &pixel, &pgap) != 2 || pixel < 1 || pgap < 0) {
      error("%s: bad %s.Pixel '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (sscanf(s = cfg_get(section, "gap", "-1x-1"), "%dx%d", &cgap, &rgap) != 2 || cgap < -1 || rgap < -1) {
      error("%s: bad %s.Gap '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (rgap < 0)
      rgap = pixel + pgap;
    if (cgap < 0)
      cgap = pixel + pgap;

    if (cfg_number(section, "border", 0, 0, -1, &border) < 0)
      return -1;

    if (sscanf(s = cfg_get(NULL, "foreground", "#102000"), "#%x", &fg_col) != 1) {
      error("%s: bad %s.foreground color '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (sscanf(s = cfg_get(NULL, "halfground", "#70c000"), "#%x", &hg_col) != 1) {
      error("%s: bad %s.halfground color '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    if (sscanf(s = cfg_get(NULL, "background", "#80d000"), "#%x", &bg_col) != 1) {
      error("%s: bad %s.background color '%s' from %s", Name, section, s, cfg_source());
      free(s);
      return -1;
    }
    free(s);

    drv_IMG_FB = malloc(DCOLS * DROWS);
    if (drv_IMG_FB == NULL) {
      error("%s: framebuffer could not be allocated: malloc() failed", Name);
      return -1;
    }

    memset(drv_IMG_FB, 0, DCOLS * DROWS * sizeof(*drv_IMG_FB));


    dimx = DCOLS * pixel + (DCOLS - 1) * pgap + (DCOLS / XRES - 1) * cgap;
    dimy = DROWS * pixel + (DROWS - 1) * pgap + (DROWS / YRES - 1) * rgap;


    /* initially flush the image to a file */
    drv_IMG_flush();

    /* regularly flush the image to a file */
    /* Fixme: make 100msec configurable */
    timer_add(drv_IMG_timer, NULL, 100, 0);


    return 0;
}



/****************************************/
/***            plugins               ***/
/****************************************/

/* none at the moment... */


/****************************************/
/***        widget callbacks          ***/
/****************************************/


/* using drv_generic_graphic_draw(W) */
/* using drv_generic_graphic_icon_draw(W) */
/* using drv_generic_graphic_bar_draw(W) */


/****************************************/
/***        exported functions        ***/
/****************************************/


/* list models */
int drv_IMG_list(void)
{
    printf("PPM PNG");
    return 0;
}


/* initialize driver & display */
int drv_IMG_init(const char *section, const __attribute__ ((unused))
             int quiet)
{
    WIDGET_CLASS wc;
    int ret;

    /* real worker functions */
    drv_generic_graphic_real_blit = drv_IMG_blit;

    /* start display */
    if ((ret = drv_IMG_start(section)) != 0)
      return ret;

    /* initialize generic graphic driver */
    if ((ret = drv_generic_graphic_init(section, Name)) != 0)
      return ret;

    /* register text widget */
    wc = Widget_Text;
    wc.draw = drv_generic_graphic_draw;
    widget_register(&wc);

    /* register icon widget */
    wc = Widget_Icon;
    wc.draw = drv_generic_graphic_icon_draw;
    widget_register(&wc);

    /* register bar widget */
    wc = Widget_Bar;
    wc.draw = drv_generic_graphic_bar_draw;
    widget_register(&wc);

    /* register plugins */
    /* none at the moment... */


    return 0;
}


/* close driver & display */
int drv_IMG_quit(const __attribute__ ((unused))
             int quiet)
{

    info("%s: shutting down.", Name);
    drv_generic_graphic_quit();

    if (drv_IMG_FB) {
      free(drv_IMG_FB);
      drv_IMG_FB = NULL;
    }

    return (0);
}


DRIVER drv_Image = {
  name:Name,
  list:drv_IMG_list,
  init:drv_IMG_init,
  quit:drv_IMG_quit,
};

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