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w3mimgdisplay.c

/* $Id: w3mimgdisplay.c,v 1.18 2003/07/13 16:20:42 ukai Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "config.h"
#include "w3mimg/w3mimg.h"

w3mimg_op *w_op;
static char *background = NULL;
static int offset_x = 0, offset_y = 0;
static int defined_bg = 0, defined_x = 0, defined_y = 0, defined_test = 0;
static int defined_debug = 0;
static char *defined_size = NULL;

#define MAX_IMAGE 1000
static W3MImage *imageBuf = NULL;
static int maxImage = 0, maxAnim = 100, clearMargin = 0;

static void GetOption(int argc, char **argv);
static void DrawImage(char *buf, int redraw);
static void TermImage(void);
static void ClearImage(char *buf);

int
main(int argc, char **argv)
{
    int len;
    char buf[1024 + 128];
#ifdef W3MIMGDISPLAY_SETUID
    uid_t runner_uid = getuid();
    uid_t owner_uid = geteuid();

    /* swap real and effective */
    setreuid(owner_uid, runner_uid);
#endif
    GetOption(argc, argv);
    if (!defined_debug)
      freopen(DEV_NULL_PATH, "w", stderr);

#ifdef W3MIMGDISPLAY_SETUID
    /* 
     * back real and effective
     * run w3mimg_open() in setuid privileges
     */
    setreuid(runner_uid, owner_uid);
#endif
    w_op = w3mimg_open();
#ifdef W3MIMGDISPLAY_SETUID
    /* make sure drop privileges now */
    setreuid(runner_uid, runner_uid);
#endif
    if (w_op == NULL)
      exit(1);
    if (defined_x)
      w_op->offset_x = offset_x;
    if (defined_y)
      w_op->offset_y = offset_y;

    w_op->max_anim = maxAnim;
    w_op->clear_margin = clearMargin;

    if (defined_test) {
      printf("%d %d\n", w_op->width - w_op->offset_x,
             w_op->height - w_op->offset_y);
      exit(0);
    }

    if (defined_size) {
      if (w_op->init(w_op)) {
          W3MImage img;
          int w, h;
          if (w_op->get_image_size(w_op, &img, defined_size, &w, &h))
            printf("%d %d\n", w, h);
      }
      exit(0);
    }

    w_op->set_background(w_op, background);

    while (fgets(buf, sizeof(buf), stdin) != NULL) {
      if (!(isdigit(buf[0]) && buf[1] == ';')) {
          fputc('\n', stdout);
          fflush(stdout);
          continue;
      }
      len = strlen(buf);
      if (buf[len - 1] == '\n') {
          buf[--len] = '\0';
          if (buf[len - 1] == '\r')
            buf[--len] = '\0';
      }
      /*
       * w3mimg protocol
       *  0  1  2 ....
       * +--+--+--+--+ ...... +--+--+
       * |op|; |args             |\n|
       * +--+--+--+--+ .......+--+--+
       *
       * args is separeted by ';'
       * op   args
       *  0;  params          draw image
       *  1;  params          redraw image
       *  2;  -none-          terminate drawing
       *  3;  -none-          sync drawing
       *  4;  -none-          nop, sync communication
       *                      response '\n'
       *  5;  path            get size of image,
       *                      response "<width> <height>\n"
       *  6;  params(6)       clear image
       *
       * params
       *      <n>;<x>;<y>;<w>;<h>;<sx>;<sy>;<sw>;<sh>;<path>
       * params(6)
       *      <x>;<y>;<w>;<h>
       *   
       */
      switch (buf[0]) {
      case '0':
          DrawImage(&buf[2], 0);
          break;
      case '1':
          DrawImage(&buf[2], 1);
          break;
      case '2':
          TermImage();
          break;
      case '3':
          w_op->sync(w_op);
          break;
      case '4':
          fputs("\n", stdout);
          fflush(stdout);
          break;
      case '5':
          if (w_op->init(w_op)) {
            W3MImage img;
            int w, h;
            if (w_op->get_image_size(w_op, &img, &buf[2], &w, &h)) {
                fprintf(stdout, "%d %d\n", w, h);
                fflush(stdout);
            }
            else {
                fprintf(stdout, "\n");
                fflush(stdout);
            }
          }
          else {
            fprintf(stdout, "\n");
            fflush(stdout);
          }
          break;
      case '6':
          ClearImage(&buf[2]);
          break;
      }
    }
    TermImage();
    w_op->close(w_op);
    exit(0);
}

static void
GetOption(int argc, char **argv)
{
    int i;

    for (i = 1; i < argc; i++) {
      if (!strcmp("-bg", argv[i])) {
          if (++i >= argc)
            exit(1);
          background = argv[i];
          defined_bg = 1;
      }
      else if (!strcmp("-x", argv[i])) {
          if (++i >= argc)
            exit(1);
          offset_x = atoi(argv[i]);
          defined_x = 1;
      }
      else if (!strcmp("-y", argv[i])) {
          if (++i >= argc)
            exit(1);
          offset_y = atoi(argv[i]);
          defined_y = 1;
      }
      else if (!strcmp("-test", argv[i])) {
          defined_test = 1;
      }
      else if (!strcmp("-anim", argv[i])) {
          if (++i >= argc)
            exit(1);
          maxAnim = atoi(argv[i]);
      }
      else if (!strcmp("-margin", argv[i])) {
          if (++i >= argc)
            exit(1);
          clearMargin = atoi(argv[i]);
          if (clearMargin < 0)
            clearMargin = 0;
      }
      else if (!strcmp("-size", argv[i])) {
          if (++i >= argc)
            exit(1);
          defined_size = argv[i];
      }
      else if (!strcmp("-debug", argv[i])) {
          defined_debug = 1;
      }
      else {
          exit(1);
      }
    }
}

void
DrawImage(char *buf, int redraw)
{
    char *p = buf;
    int n = 0, x = 0, y = 0, w = 0, h = 0, sx = 0, sy = 0, sw = 0, sh = 0;

    if (!p)
      return;
    for (; isdigit(*p); p++)
      n = 10 * n + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      x = 10 * x + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      y = 10 * y + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      w = 10 * w + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      h = 10 * h + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      sx = 10 * sx + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      sy = 10 * sy + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      sw = 10 * sw + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      sh = 10 * sh + (*p - '0');
    if (*(p++) != ';')
      return;

    n--;
    if (n < 0 || n >= MAX_IMAGE)
      return;
    if (redraw) {
      if (!w_op->active(w_op) || n >= maxImage || !imageBuf[n].pixmap)
          return;
      goto draw_image;
    }
    w_op->init(w_op);

    if (n >= maxImage) {
      int i = maxImage;
      maxImage = i ? (i * 2) : 2;
      if (maxImage > MAX_IMAGE)
          maxImage = MAX_IMAGE;
      else if (n >= maxImage)
          maxImage = n + 1;
      imageBuf = (W3MImage *) realloc((void *)imageBuf,
                              sizeof(W3MImage) * maxImage);
      for (; i < maxImage; i++)
          imageBuf[i].pixmap = NULL;
    }
    if (imageBuf[n].pixmap) {
      w_op->free_image(w_op, &imageBuf[n]);
      imageBuf[n].pixmap = NULL;
    }

    if (w_op->load_image(w_op, &imageBuf[n], p, w, h) == 0)
      imageBuf[n].pixmap = NULL;

  draw_image:
    if (imageBuf[n].pixmap)
      w_op->show_image(w_op, &imageBuf[n], sx, sy, sw, sh, x, y);
}

void
TermImage(void)
{
    w_op->finish(w_op);
    if (imageBuf) {
      int i;
      for (i = 0; i < maxImage; i++) {
          w_op->free_image(w_op, &imageBuf[i]);
      }
      free(imageBuf);
      imageBuf = NULL;
    }
    maxImage = 0;
}

void
ClearImage(char *buf)
{
    char *p = buf;
    int x = 0, y = 0, w = 0, h = 0;

    if (!p)
      return;
    for (; isdigit(*p); p++)
      x = 10 * x + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      y = 10 * y + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      w = 10 * w + (*p - '0');
    if (*(p++) != ';')
      return;
    for (; isdigit(*p); p++)
      h = 10 * h + (*p - '0');

    w_op->clear(w_op,
            x + offset_x - w_op->clear_margin,
            y + offset_y - w_op->clear_margin,
            w + w_op->clear_margin * 2, h + w_op->clear_margin * 2);
}

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