Merge pull request #72 from czarkoff/timeouts

Timeouts

4 files changed, 56 insertions, 33 deletions

diff --git a/doc/imv.1 b/doc/imv.1
index d328295..cbd5c68 100644
--- a/doc/imv.1
+++ b/doc/imv.1
@@ -61,6 +61,7 @@ may be expressed as a number or as a path of an image.
 Recursively search input paths for files.
 .It Fl t Ar seconds 
 Set the slideshow delay in seconds.
+Fractional numbers are accepted.
 Setting this to zero disables slideshow mode, which is the default.
 .It Fl u
 Use nearest neighbour resampling. Recommended for pixel art.
diff --git a/src/main.c b/src/main.c
index 9a25dfb..25ffce1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -15,8 +15,10 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
 
+#include <limits.h>
 #include <stdio.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_ttf.h>
 #include <FreeImage.h>
@@ -37,7 +39,7 @@ struct {
   int nearest_neighbour;
   int solid_bg;
   int list;
-  unsigned int delay;
+  unsigned long delay;
   unsigned char bg_r;
   unsigned char bg_g;
   unsigned char bg_b;
@@ -129,7 +131,7 @@ static void parse_args(int argc, char** argv)
   opterr = 0;
 
   const char* name = argv[0];
-  char o;
+  char *argp, o;
 
   while((o = getopt(argc, argv, "firaudhln:b:e:t:")) != -1) {
     switch(o) {
@@ -163,7 +165,24 @@ static void parse_args(int argc, char** argv)
         g_options.font = optarg;
         break;
       case 't':
-        g_options.delay = (unsigned int)atoi(optarg);
+        g_options.delay = strtoul(optarg, &argp, 10);
+        g_options.delay *= 1000;
+        if (*argp == '.') {
+          char *ep;
+          long delay = strtoul(++argp, &ep, 10);
+          for (int i = 3 - (ep - argp); i; i--) {
+            delay *= 10;
+          }
+          if (delay < 1000) {
+            g_options.delay += delay;
+          } else {
+            g_options.delay = ULONG_MAX;
+          }
+        }
+        if (g_options.delay == ULONG_MAX) {
+          fprintf(stderr, "Wrong slideshow delay '%s'. Aborting.\n", optarg);
+          exit(1);
+        }
         break;
       case '?':
         fprintf(stderr, "Unknown argument '%c'. Aborting.\n", optopt);
@@ -293,12 +312,14 @@ int main(int argc, char** argv)
   unsigned int last_time;
   unsigned int current_time;
 
+  /* keep file change polling rate under control */
+  static uint8_t poll_countdown = UINT8_MAX;
+
   /* do we need to redraw the window? */
   int need_redraw = 1;
 
   /* used to calculate when to skip to the next image in slideshow mode */
-  unsigned int msecs_passed = 0;
-  unsigned int delay_seconds_passed = 0;
+  unsigned long delay_mseconds_passed = 0;
 
   int quit = 0;
   while(!quit) {
@@ -319,13 +340,13 @@ int main(int argc, char** argv)
             case SDLK_LEFT:
               imv_navigator_select_rel(&nav, -1);
               /* reset slideshow delay */
-              delay_seconds_passed = 0;
+              delay_mseconds_passed = 0;
               break;
             case SDLK_RIGHTBRACKET:
             case SDLK_RIGHT:
               imv_navigator_select_rel(&nav, 1);
               /* reset slideshow delay */
-              delay_seconds_passed = 0;
+              delay_mseconds_passed = 0;
               break;
             case SDLK_EQUALS:
             case SDLK_i:
@@ -418,7 +439,7 @@ int main(int argc, char** argv)
     }
 
     /* if the user has changed image, start loading the new one */
-    if(imv_navigator_poll_changed(&nav)) {
+    if(imv_navigator_poll_changed(&nav, poll_countdown--)) {
       const char *current_path = imv_navigator_selection(&nav);
       if(!current_path) {
         fprintf(stderr, "No input files left. Exiting.\n");
@@ -460,19 +481,14 @@ int main(int argc, char** argv)
     }
 
     /* handle slideshow */
-    if (g_options.delay) {
+    if(g_options.delay) {
       unsigned int dt = current_time - last_time;
 
-      msecs_passed = msecs_passed + dt;
-      /* tick every second */
-      if(msecs_passed >= 1000) {
-        msecs_passed = 0;
-        delay_seconds_passed++;
-        need_redraw = 1;
-        if(delay_seconds_passed >= g_options.delay) {
-          imv_navigator_select_rel(&nav, 1);
-          delay_seconds_passed = 0;
-        }
+      delay_mseconds_passed += dt;
+      need_redraw = 1;
+      if(delay_mseconds_passed >= g_options.delay) {
+        imv_navigator_select_rel(&nav, 1);
+        delay_mseconds_passed = 0;
       }
     }
 
@@ -488,10 +504,10 @@ int main(int argc, char** argv)
       /* update window title */
       const char *current_path = imv_navigator_selection(&nav);
       char title[256];
-      if(g_options.delay) {
-        snprintf(&title[0], sizeof(title), "imv - [%i/%i] [%i/%is] [%ix%i] %s",
-            nav.cur_path + 1, nav.num_paths, delay_seconds_passed + 1,
-            g_options.delay, tex.width, tex.height, current_path);
+      if(g_options.delay > 1000) {
+        snprintf(&title[0], sizeof(title), "imv - [%i/%i] [%lu/%lus] [%ix%i] %s",
+            nav.cur_path + 1, nav.num_paths, delay_mseconds_passed / 1000 + 1,
+            g_options.delay / 1000, tex.width, tex.height, current_path);
       } else {
         snprintf(&title[0], sizeof(title), "imv - [%i/%i] [%ix%i] %s",
             nav.cur_path + 1, nav.num_paths,
@@ -501,10 +517,10 @@ int main(int argc, char** argv)
 
       /* update the overlay */
       if(font) {
-        if(g_options.delay) {
-          snprintf(&title[0], sizeof(title), "[%i/%i] [%i/%is] %s",
-              nav.cur_path + 1, nav.num_paths, delay_seconds_passed + 1,
-              g_options.delay, current_path);
+        if(g_options.delay > 1000) {
+          snprintf(&title[0], sizeof(title), "[%i/%i] [%lu/%lus] %s",
+              nav.cur_path + 1, nav.num_paths, delay_mseconds_passed / 1000 + 1,
+              g_options.delay / 1000, current_path);
         } else {
           snprintf(&title[0], sizeof(title), "[%i/%i] %s", nav.cur_path + 1,
               nav.num_paths, current_path);
@@ -549,6 +565,9 @@ int main(int argc, char** argv)
       /* redraw complete, unset the flag */
       need_redraw = 0;
 
+      /* reset poll countdown timer */
+      poll_countdown = UINT8_MAX;
+
       /* tell SDL to show the newly drawn frame */
       SDL_RenderPresent(renderer);
     }
diff --git a/src/navigator.c b/src/navigator.c
index c504cd8..fb2a3cd 100644
--- a/src/navigator.c
+++ b/src/navigator.c
@@ -210,19 +210,22 @@ int imv_navigator_find_path(struct imv_navigator *nav, const char *path)
   return -1;
 }
 
-int imv_navigator_poll_changed(struct imv_navigator *nav)
+int imv_navigator_poll_changed(struct imv_navigator *nav, const int nopoll)
 {
   if(nav->changed) {
     nav->changed = 0;
     return 1;
-  } else {
+  }
+  
+  if(!nopoll) {
     struct stat file_info;
-    if (stat(nav->paths[nav->cur_path], &file_info) == -1)
+    if(stat(nav->paths[nav->cur_path], &file_info) == -1) {
       return 0;
-    if (nav->mtimes[nav->cur_path] != file_info.st_mtim.tv_sec) {
+    }
+    if(nav->mtimes[nav->cur_path] != file_info.st_mtim.tv_sec) {
       nav->mtimes[nav->cur_path] = file_info.st_mtim.tv_sec;
       return 1;
     }
-    return 0;
   }
+  return 0;
 }
diff --git a/src/navigator.h b/src/navigator.h
index 4fd2fa7..749f656 100644
--- a/src/navigator.h
+++ b/src/navigator.h
@@ -62,6 +62,6 @@ int imv_navigator_find_path(struct imv_navigator *nav, const char *path);
 
 /* Returns 1 if either the currently selected path or underlying file has
  * changed since last called */
-int imv_navigator_poll_changed(struct imv_navigator *nav);
+int imv_navigator_poll_changed(struct imv_navigator *nav, const int nopoll);
 
 #endif