From 037185de6d1bd6d6250e3226c680d115e23693d0 Mon Sep 17 00:00:00 2001
From: Harry Jeffery <harry@exec64.co.uk>
Date: Sat, 28 Nov 2015 00:17:28 +0000
Subject: Add some infrastructure for gif playback

---
 src/loader.c | 27 ++++++++++++++++++++++-----
 src/loader.h |  2 +-
 src/main.c   |  6 ++++++
 3 files changed, 29 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/loader.c b/src/loader.c
index 34641f1..404bbb5 100644
--- a/src/loader.c
+++ b/src/loader.c
@@ -102,16 +102,24 @@ char *imv_loader_get_error(struct imv_loader *ldr)
 
 void imv_loader_load_next_frame(struct imv_loader *ldr)
 {
-  pthread_mutex_lock(&ldr->lock);
-  /* TODO */
-  pthread_mutex_unlock(&ldr->lock);
+  /* TODO kick off next frame thread */
 }
 
 void imv_loader_time_passed(struct imv_loader *ldr, double dt)
 {
+  int get_frame = 0;
   pthread_mutex_lock(&ldr->lock);
-  /* TODO */
+  if(ldr->num_frames > 1) {
+    ldr->frame_time -= dt;
+    if(ldr->frame_time < 0) {
+      get_frame = 1;
+    }
+  }
   pthread_mutex_unlock(&ldr->lock);
+
+  if(get_frame) {
+    imv_loader_load_next_frame();
+  }
 }
 
 void imv_loader_error_occurred(struct imv_loader *ldr)
@@ -167,6 +175,7 @@ static void *imv_loader_bg_new_img(void *data)
   FIMULTIBITMAP *mbmp = NULL;
   FIBITMAP *bmp = NULL;
   int width, height;
+  int raw_frame_time = 100; /* default to 100 */
 
   if(fmt == FIF_GIF) {
     mbmp = FreeImage_OpenMultiBitmap(FIF_GIF, path,
@@ -191,7 +200,15 @@ static void *imv_loader_bg_new_img(void *data)
     width = FreeImage_GetWidth(frame);
     height = FreeImage_GetHeight(frame);
     bmp = FreeImage_ConvertTo32Bits(frame);
+
+    /* get duration of first frame */
+    FITAG *tag = NULL;
+    FreeImage_GetMetadata(FIMD_ANIMATION, frame, "FrameTime", &tag);
+    if(FreeImage_GetTagValue(tag)) {
+      raw_frame_time = *(int*)FreeImage_GetTagValue(tag);
+    }
     FreeImage_UnlockPage(mbmp, frame, 0);
+
   } else {
     FIBITMAP *image = FreeImage_Load(fmt, path, 0);
     free(path);
@@ -231,7 +248,7 @@ static void *imv_loader_bg_new_img(void *data)
   ldr->cur_frame = 0;
   ldr->next_frame = 1;
   ldr->num_frames = num_frames;
-  ldr->frame_time = 0;
+  ldr->frame_time = (double)raw_frame_time * 0.0001;
 
   pthread_mutex_unlock(&ldr->lock);
   return 0;
diff --git a/src/loader.h b/src/loader.h
index 625dce5..7be7aa2 100644
--- a/src/loader.h
+++ b/src/loader.h
@@ -49,6 +49,6 @@ FIBITMAP *imv_loader_get_image(struct imv_loader *ldr);
 char *imv_loader_get_error(struct imv_loader *ldr);
 
 void imv_loader_load_next_frame(struct imv_loader *ldr);
-/* void imv_loader_time_passed(struct imv_loader *ldr, double dt); */
+void imv_loader_time_passed(struct imv_loader *ldr, double dt);
 
 #endif
diff --git a/src/main.c b/src/main.c
index 78cc758..f8f537b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -390,6 +390,12 @@ int main(int argc, char** argv)
       }
     }
 
+    if(view.playing) {
+      double cur_time = SDL_GetTicks() / 1000.0;
+      double dt = cur_time - last_time;
+      last_time = SDL_GetTicks() / 1000.0;
+      imv_loader_time_passed(tex, dt);
+    }
 
     if(view.redraw) {
       if(g_options.solid_bg) {
-- 
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