Support caching of thumbnails up to 256x256 pixels (.thumbnails/large)

Depending on --thumb-width/--thumb-height, either .thumbnails/normal or
.thumbnails/large is used. For higher dimensions, thumbnail caching is still
silently disabled, this should also be what the standard indicates.

3 files changed, 42 insertions, 28 deletions

diff --git a/src/options.c b/src/options.c
index 52c90d6..f967456 100644
--- a/src/options.c
+++ b/src/options.c
@@ -798,14 +798,6 @@ static void check_options(void)
 		opt.thumb_title = NULL;
 	}
 
-	if (opt.cache_thumbnails && ((opt.thumb_w > 128) || (opt.thumb_h > 128))) {
-		/* No warning needed, the documentation should be clear enough.
-		 * Plus, we don't want to annoy users who use --cache-thumbnails by
-		 * default but frequently change their thumbnail size.
-		 */
-		opt.cache_thumbnails = 0;
-	}
-
 	D_RETURN_(4);
 }
 
@@ -970,7 +962,7 @@ void show_usage(void)
 " -t, --thumbnails          As --index, but clicking an image will open it in\n"
 "                           a new viewing window\n"
 "     --cache-thumbnails    Enable thumbnail caching for thumbnail mode.\n"
-"                           Only works with thumbnails <= 128x128 pixels\n"
+"                           Only works with thumbnails <= 256x256 pixels\n"
 " -~, --thumb-title STRING  Set window title for images opened from thumbnail mode.\n"
 "                           Supports format specifiers, see there.\n"
 " -I, --fullindex           Same as index mode, but below each thumbnail you\n"
diff --git a/src/thumbnail.c b/src/thumbnail.c
index ece4853..fe36213 100644
--- a/src/thumbnail.c
+++ b/src/thumbnail.c
@@ -172,9 +172,27 @@ void init_thumbnail_mode(void)
 
 	/* make sure we have an ~/.thumbnails/normal directory for storing
 	   permanent thumbnails */
-	td.cache_thumbnails = feh_thumbnail_setup_thumbnail_dir();
 	td.cache_thumbnails = opt.cache_thumbnails;
 
+	if (td.cache_thumbnails) {
+		if (opt.thumb_w > opt.thumb_h)
+			td.cache_dim = opt.thumb_w;
+		else
+			td.cache_dim = opt.thumb_h;
+
+		if (td.cache_dim > 256) {
+			/* No caching as specified by standard. Sort of. */
+			td.cache_thumbnails = 0;
+		} else if (td.cache_dim > 128) {
+			td.cache_dim = 256;
+			td.cache_dir = estrdup("large");
+		} else {
+			td.cache_dim = 128;
+			td.cache_dir = estrdup("normal");
+		}
+		feh_thumbnail_setup_thumbnail_dir();
+	}
+
 	for (l = filelist; l; l = l->next) {
 		file = FEH_FILE(l->data);
 		if (last) {
@@ -736,7 +754,7 @@ char *feh_thumbnail_get_name(char *uri)
 
 	home = getenv("HOME");
 	if (home) {
-		thumb_file = estrjoin("/", home, ".thumbnails/normal", md5_name, NULL);
+		thumb_file = estrjoin("/", home, ".thumbnails", td.cache_dir, md5_name, NULL);
 	}
 
 	free(md5_name);
@@ -748,7 +766,7 @@ char *feh_thumbnail_get_name_uri(char *name)
 {
 	char *cwd, *uri = NULL;
 
-	/* FIXME: what happends with http, https, and ftp? MTime etc */
+	/* FIXME: what happens with http, https, and ftp? MTime etc */
 	if ((strncmp(name, "http://", 7) != 0) &&
 	    (strncmp(name, "https://", 8) != 0) && (strncmp(name, "ftp://", 6) != 0)
 	    && (strncmp(name, "file://", 7) != 0)) {
@@ -801,15 +819,15 @@ int feh_thumbnail_generate(Imlib_Image * image, feh_file * file,
 	if (feh_load_image(&im_temp, file) != 0) {
 		w = gib_imlib_image_get_width(im_temp);
 		h = gib_imlib_image_get_height(im_temp);
-		thumb_w = 128;
-		thumb_h = 128;
+		thumb_w = td.cache_dim;
+		thumb_h = td.cache_dim;
 
-		if ((w > 128) || (h > 128)) {
+		if ((w > td.cache_dim) || (h > td.cache_dim)) {
 			double ratio = (double) w / h;
 			if (ratio > 1.0)
-				thumb_h = 128 / ratio;
+				thumb_h = td.cache_dim / ratio;
 			else if (ratio != 1.0)
-				thumb_w = 128 * ratio;
+				thumb_w = td.cache_dim * ratio;
 		}
 
 		*image = gib_imlib_create_cropped_scaled_image(im_temp, 0, 0, w, h,
@@ -865,7 +883,7 @@ int feh_thumbnail_setup_thumbnail_dir(void)
 
 	home = getenv("HOME");
 	if (home != NULL) {
-		dir = estrjoin("/", home, ".thumbnails/normal", NULL);
+		dir = estrjoin("/", home, ".thumbnails", td.cache_dir, NULL);
 
 		if (!stat(dir, &sb)) {
 			if (S_ISDIR(sb.st_mode))
diff --git a/src/thumbnail.h b/src/thumbnail.h
index d015994..a384d11 100644
--- a/src/thumbnail.h
+++ b/src/thumbnail.h
@@ -45,20 +45,24 @@ typedef struct thumbnail {
 typedef struct thumbmode_data {
 	/* FIXME: text_area_h not really needed, remove? */
 
-	Imlib_Image im_main;	/* base image which all thumbnails are rendered on */
-	Imlib_Image im_bg;	/* background for the thumbnails */
+	Imlib_Image im_main;     /* base image which all thumbnails are rendered on */
+	Imlib_Image im_bg;       /* background for the thumbnails */
 
-	Imlib_Font font_main;	/* font used for file info */
-	Imlib_Font font_title;	/* font used for title */
+	Imlib_Font font_main;    /* font used for file info */
+	Imlib_Font font_title;   /* font used for title */
 
-	int w, h, bg_w, bg_h;	/* dimensions of the window and bg image */
+	int w, h, bg_w, bg_h;    /* dimensions of the window and bg image */
 
-	int thumb_tot_h;	/* total space needed for a thumbnail including description */
-	int text_area_w, text_area_h;	/* space needed for thumbnail description */
+	int thumb_tot_h;         /* total space needed for a thumbnail including description */
+	int text_area_w, text_area_h; /* space needed for thumbnail description */
+
+	int max_column_w;        /* FIXME: description */
+	int vertical;            /* FIXME: vertical in what way? */
+
+	int cache_thumbnails;    /* use cached thumbnails from ~/.thumbnails */
+	int cache_dim;           /* 128 = 128x128 ("normal"), 256 = 256x256 ("large") */
+	char *cache_dir;         /* "normal"/"large" (.thumbnails/...) */
 
-	int max_column_w;	/* FIXME: description */
-	int vertical;		/* FIXME: vertical in what way? */
-	int cache_thumbnails;	/* use cached thumbnails from ~/.thumbnails/normal */
 } thumbmode_data;
 
 feh_thumbnail *feh_thumbnail_new(feh_file * fil, int x, int y, int w, int h);