Revised thumbnail loading...

- Only load the thumbnails that are currently visible in the window
- Unload thumbnails that are leaving the visible area
- Much less memory needed, but scrolling is now slower
- This also unintentionally fixes issue #86

Makefile

@@ -1,4 +1,4 @@
-VERSION = git-20140911
+VERSION = git-20140926
 
 PREFIX    = /usr/local
 MANPREFIX = $(PREFIX)/share/man

commands.c

@@ -470,7 +470,8 @@ bool ct_reload_all(arg_t a)
 {
 	tns_free(&tns);
 	tns_init(&tns, files, filecnt, &fileidx, &win);
-	return false;
+	tns.dirty = true;
+	return true;
 }
 
 

main.c

@@ -368,14 +368,13 @@ void update_info(void)
 		return;
 	mark = files[fileidx].marked ? "+ " : "";
 	if (mode == MODE_THUMB) {
-		if (tns.loadnext >= filecnt) {
-			n = snprintf(rt, rlen, "%s%0*d/%d", mark, fw, fileidx + 1, filecnt);
-			ow_info = true;
-		} else {
-			snprintf(lt, llen, "Loading... %0*d/%d", fw, tns.loadnext, filecnt);
-			rt[0] = '\0';
+		if (tns.loadnext < tns.end) {
+			snprintf(lt, llen, "Loading... %0*d", fw, tns.loadnext);
 			ow_info = false;
+		} else {
+			ow_info = true;
 		}
+		n = snprintf(rt, rlen, "%s%0*d/%d", mark, fw, fileidx + 1, filecnt);
 	} else {
 		n = snprintf(rt, rlen, "%s", mark);
 		if (img.ss.on)
@@ -439,7 +438,7 @@ void reset_cursor(void)
 			}
 		}
 	} else {
-		if (tns.loadnext < filecnt)
+		if (tns.loadnext < tns.end)
 			cursor = CURSOR_WATCH;
 		else
 			cursor = CURSOR_ARROW;
@@ -531,7 +530,7 @@ void run_key_handler(const char *key, unsigned int mask)
 				memcmp(&oldst->st_mtime, &newst.st_mtime, sizeof(newst.st_mtime)) != 0)
 		{
 			if (tns.thumbs != NULL) {
-				tns.thumbs[finfo[i].fn].loaded = false;
+				tns_unload(&tns, finfo[i].fn);
 				tns.loadnext = MIN(tns.loadnext, finfo[i].fn);
 			}
 			changed = true;
@@ -669,29 +668,24 @@ void run(void)
 	int xfd;
 	fd_set fds;
 	struct timeval timeout;
-	bool discard, reload, to_set;
+	bool discard, to_set;
 	XEvent ev, nextev;
 
 	set_timeout(redraw, 25, false);
 
 	while (true) {
-		while (mode == MODE_THUMB && tns.loadnext < filecnt &&
+		while (mode == MODE_THUMB && tns.loadnext < tns.end &&
 		       XPending(win.env.dpy) == 0)
 		{
 			/* load thumbnails */
-			reload = tns.loadnext != tns.cnt;
 			set_timeout(redraw, TO_REDRAW_THUMBS, false);
-			if (tns_load(&tns, tns.loadnext, reload)) {
-				if (!reload)
-					tns.cnt++;
-			} else {
+			if (!tns_load(&tns, tns.loadnext, false)) {
 				remove_file(tns.loadnext, false);
-				if (reload)
 				tns.dirty = true;
 			}
-			while (tns.loadnext < filecnt && tns.thumbs[tns.loadnext].loaded)
+			while (tns.loadnext < tns.end && tns.thumbs[tns.loadnext].im != NULL)
 				tns.loadnext++;
-			if (tns.loadnext >= filecnt)
+			if (tns.loadnext >= tns.end)
 				redraw();
 			else
 				check_timeouts(NULL);
@@ -882,7 +876,6 @@ int main(int argc, char **argv)
 		tns_init(&tns, files, filecnt, &fileidx, &win);
 		while (!tns_load(&tns, 0, false))
 			remove_file(0, false);
-		tns.cnt = 1;
 	} else {
 		mode = MODE_IMAGE;
 		tns.thumbs = NULL;

thumbs.c

@@ -56,7 +56,7 @@ char* tns_cache_filepath(const char *filepath)
 	return cfile;
 }
 
-Imlib_Image tns_cache_load(const char *filepath)
+Imlib_Image tns_cache_load(const char *filepath, bool *outdated)
 {
 	char *cfile;
 	struct stat cstats, fstats;
@@ -68,8 +68,12 @@ Imlib_Image tns_cache_load(const char *filepath)
 		return NULL;
 
 	if ((cfile = tns_cache_filepath(filepath)) != NULL) {
-		if (stat(cfile, &cstats) == 0 && cstats.st_mtime == fstats.st_mtime)
+		if (stat(cfile, &cstats) == 0) {
+			if (cstats.st_mtime == fstats.st_mtime)
 				im = imlib_load_image(cfile);
+			else
+				*outdated = true;
+		}
 		free(cfile);
 	}
 	return im;
@@ -165,8 +169,8 @@ void tns_init(tns_t *tns, const fileinfo_t *files, int cnt, int *sel, win_t *win
 		tns->thumbs = NULL;
 	}
 	tns->files = files;
-	tns->cap = cnt;
-	tns->cnt = tns->loadnext = tns->first = 0;
+	tns->cnt = cnt;
+	tns->loadnext = tns->first = tns->end = tns->r_first = tns->r_end = 0;
 	tns->sel = sel;
 	tns->win = win;
 	tns->dirty = false;
@@ -218,7 +222,7 @@ bool tns_load(tns_t *tns, int n, bool force)
 
 	if (tns == NULL || tns->thumbs == NULL)
 		return false;
-	if (n < 0 || n >= tns->cap)
+	if (n < 0 || n >= tns->cnt)
 		return false;
 	file = &tns->files[n];
 	if (file->name == NULL || file->path == NULL)
@@ -231,7 +235,7 @@ bool tns_load(tns_t *tns, int n, bool force)
 		imlib_free_image();
 	}
 
-	if (!force && (im = tns_cache_load(file->path)) != NULL) {
+	if (!force && (im = tns_cache_load(file->path, &force)) != NULL) {
 		cache_hit = true;
 	} else {
 #if HAVE_LIBEXIF
@@ -323,11 +327,28 @@ bool tns_load(tns_t *tns, int n, bool force)
 	if (!cache_hit)
 		tns_cache_write(t, file, true);
 
-	t->loaded = true;
 	tns->dirty = true;
 	return true;
 }
 
+void tns_unload(tns_t *tns, int n)
+{
+	thumb_t *t;
+
+	if (tns == NULL || tns->thumbs == NULL)
+		return;
+	if (n < 0 || n >= tns->cnt)
+		return;
+
+	t = &tns->thumbs[n];
+
+	if (t->im != NULL) {
+		imlib_context_set_image(t->im);
+		imlib_free_image();
+		t->im = NULL;
+	}
+}
+
 void tns_check_view(tns_t *tns, bool scrolled)
 {
 	int r;
@@ -385,20 +406,31 @@ void tns_render(tns_t *tns)
 		if (r > 0)
 			cnt -= r % tns->cols;
 	}
-
 	r = cnt % tns->cols ? 1 : 0;
 	tns->x = x = (win->w - MIN(cnt, tns->cols) * thumb_dim) / 2 + 5;
 	tns->y = y = (win->h - (cnt / tns->cols + r) * thumb_dim) / 2 + 5;
+	tns->loadnext = tns->cnt;
+	tns->end = tns->first + cnt;
 
-	for (i = 0; i < cnt; i++) {
-		t = &tns->thumbs[tns->first + i];
+	for (i = tns->r_first; i < tns->r_end; i++) {
+		if ((i < tns->first || i >= tns->end) && tns->thumbs[i].im != NULL)
+			tns_unload(tns, i);
+	}
+	tns->r_first = tns->first;
+	tns->r_end = tns->end;
+
+	for (i = tns->first; i < tns->end; i++) {
+		t = &tns->thumbs[i];
+		if (t->im != NULL) {
 			t->x = x + (THUMB_SIZE - t->w) / 2;
 			t->y = y + (THUMB_SIZE - t->h) / 2;
 			imlib_context_set_image(t->im);
-		imlib_render_image_part_on_drawable_at_size(0, 0, t->w, t->h,
-		                                            t->x, t->y, t->w, t->h);
-		if (tns->files[tns->first + i].marked)
-			tns_mark(tns, tns->first + i, true);
+			imlib_render_image_on_drawable_at_size(t->x, t->y, t->w, t->h);
+			if (tns->files[i].marked)
+				tns_mark(tns, i, true);
+		} else {
+			tns->loadnext = MIN(tns->loadnext, i);
+		}
 		if ((i + 1) % tns->cols == 0) {
 			x = tns->x;
 			y += thumb_dim;
@@ -415,7 +447,7 @@ void tns_mark(tns_t *tns, int n, bool mark)
 	if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
 		return;
 
-	if (n >= 0 && n < tns->cnt) {
+	if (n >= 0 && n < tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
 		unsigned long col = win->fullscreen ? win->fscol : win->bgcol;
@@ -440,7 +472,7 @@ void tns_highlight(tns_t *tns, int n, bool hl)
 	if (tns == NULL || tns->thumbs == NULL || tns->win == NULL)
 		return;
 
-	if (n >= 0 && n < tns->cnt) {
+	if (n >= 0 && n < tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
 		unsigned long col;

thumbs.h

@@ -31,16 +31,15 @@ typedef struct {
 	int h;
 	int x;
 	int y;
-	bool loaded;
 } thumb_t;
 
 typedef struct {
 	const fileinfo_t *files;
 	thumb_t *thumbs;
-	int cap;
 	int cnt;
 	int loadnext;
-	int first;
+	int first, end;
+	int r_first, r_end;
 	int *sel;
 
 	win_t *win;
@@ -58,6 +57,7 @@ void tns_init(tns_t*, const fileinfo_t*, int, int*, win_t*);
 void tns_free(tns_t*);
 
 bool tns_load(tns_t*, int, bool);
+void tns_unload(tns_t*, int);
 
 void tns_render(tns_t*);
 void tns_mark(tns_t*, int, bool);