From 078136d2176e89e99505332d57c2297cfa5faad8 Mon Sep 17 00:00:00 2001
From: Aleksander Nitecki <ixendr@itogi.re>
Date: Mon, 30 Dec 2013 23:16:17 +0100
Subject: Read GIF's repeat information from file.

---
 config.def.h |  2 +-
 image.c      | 25 +++++++++++++++++++++++--
 image.h      |  2 ++
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/config.def.h b/config.def.h
index b1e9c02..532de3f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -43,7 +43,7 @@ static const float zoom_levels[] = {
 enum {
 	GIF_DELAY    = 100, /* delay time (in ms) */
 	GIF_AUTOPLAY = 1,   /* autoplay when loaded [0/1] */
-	GIF_LOOP     = 0    /* endless loop [0/1] */
+	GIF_LOOP     = -1   /* endless loop [0 / 1 / -1=as specified in file] */
 };
 
 /* gamma correction: the user-visible ranges [-GAMMA_RANGE, 0] and
diff --git a/image.c b/image.c
index 2d82f95..12cc45f 100644
--- a/image.c
+++ b/image.c
@@ -83,6 +83,8 @@ void img_init(img_t *img, win_t *win)
 	img->alpha = !RENDER_WHITE_ALPHA;
 	img->multi.cap = img->multi.cnt = 0;
 	img->multi.animate = false;
+	img->multi.anim_repeats = -1;
+	img->multi.repeats_currently_left = 0;
 
 	img->cmod = imlib_create_color_modifier();
 	img->gamma = MIN(MAX(options->gamma, -GAMMA_RANGE), GAMMA_RANGE);
@@ -144,6 +146,8 @@ bool img_load_gif(img_t *img, const fileinfo_t *file)
 	}
 	img->multi.cnt = 0;
 	img->multi.sel = 0;
+	img->multi.anim_repeats = -1;
+	img->multi.repeats_currently_left = 0;
 
 #if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
 	gif = DGifOpenFileName(file->path, NULL);
@@ -170,7 +174,7 @@ bool img_load_gif(img_t *img, const fileinfo_t *file)
 
 			DGifGetExtension(gif, &ext_code, &ext);
 			while (ext) {
-				if (ext_code == 0xf9) {
+				if (ext_code == 0xf9) { /*Graphics Control Extension*/
 					if (ext[1] & 1)
 						transp = (int) ext[4];
 					else
@@ -181,6 +185,16 @@ bool img_load_gif(img_t *img, const fileinfo_t *file)
 						delay = MAX(delay, MIN_GIF_DELAY);
 
 					disposal = (unsigned int) ext[1] >> 2 & 0x7;
+				} else if (ext_code == 0xff) { /*Application Extension*/
+					if(ext[0] == 11 && memcmp(ext+1, "NETSCAPE2.0", 11) == 0) {
+						DGifGetExtensionNext(gif, &ext);
+
+						if(ext && ext[0] == 3 && ext[1] == 1) {
+							img->multi.repeats_currently_left =
+							img->multi.anim_repeats =
+								((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
+						}
+					}
 				}
 				ext = NULL;
 				DGifGetExtensionNext(gif, &ext);
@@ -797,8 +811,15 @@ bool img_frame_animate(img_t *img, bool restart)
 		return false;
 
 	if (img->multi.sel + 1 >= img->multi.cnt) {
-		if (restart || GIF_LOOP) {
+		if (GIF_LOOP == 1 || (GIF_LOOP == -1 && img->multi.anim_repeats == 0) ) {
+			img_frame_goto(img, 0);
+		} else if(restart) {
+			img_frame_goto(img, 0);
+			img->multi.repeats_currently_left =
+				(img->multi.anim_repeats != -1 ? img->multi.anim_repeats : 0);
+		} else if(GIF_LOOP == -1 && img->multi.repeats_currently_left != 0) {
 			img_frame_goto(img, 0);
+			--img->multi.repeats_currently_left;
 		} else {
 			img->multi.animate = false;
 			return false;
diff --git a/image.h b/image.h
index 04d48a3..9c3ced3 100644
--- a/image.h
+++ b/image.h
@@ -35,6 +35,8 @@ typedef struct {
 	int cnt;
 	int sel;
 	bool animate;
+	int anim_repeats; // -1=don't repeat, 0=repeat infinitely, N=repeat N times
+	unsigned int repeats_currently_left;
 } multi_img_t;
 
 typedef struct {
-- 
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