From http://www.jwz.org/xscreensaver/xscreensaver-5.35.tar.gz

[xscreensaver] / hacks / recanim.c

diff --git a/hacks/recanim.c b/hacks/recanim.c
index f8a3dd5948a59cbcff1ffdd892216d059d54f70a..51379ed0a2ce2fa4903004233f4e4e2b0ff09c1c 100644 (file)
--- a/hacks/recanim.c
+++ b/hacks/recanim.c
@@ -1,4 +1,4 @@
-/* recanim, Copyright (c) 2014 Jamie Zawinski <jwz@jwz.org>
+/* recanim, Copyright (c) 2014-2015 Jamie Zawinski <jwz@jwz.org>
  * Record animation frames of the running screenhack.
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
@@ -15,12 +15,12 @@
 #endif /* HAVE_CONFIG_H */
 
 #ifdef USE_GL
-# ifdef HAVE_COCOA
+# ifdef HAVE_JWXYZ
 #  include "jwxyz.h"
-# else /* !HAVE_COCOA -- real Xlib */
+# else /* !HAVE_JWXYZ -- real Xlib */
 #  include <GL/glx.h>
 #  include <GL/glu.h>
-# endif /* !HAVE_COCOA */
+# endif /* !HAVE_JWXYZ */
 # ifdef HAVE_JWZGLES
 #  include "jwzgles.h"
 # endif /* HAVE_JWZGLES */
@@ -48,6 +48,7 @@ struct record_anim_state {
   XWindowAttributes xgwa;
   char *title;
   int pct;
+  int fade_frames;
 # ifdef USE_GL
   char *data, *data2;
 # else  /* !USE_GL */
@@ -75,6 +76,10 @@ screenhack_record_anim_init (Screen *screen, Window window, int target_frames)
   st->window = window;
   st->target_frames = target_frames;
   st->frame_count = 0;
+  st->fade_frames = 30 * 1.5;
+
+  if (st->fade_frames >= (st->target_frames / 2) - 30)
+    st->fade_frames = 0;
 
 # ifdef HAVE_GDK_PIXBUF
   {
@@ -114,14 +119,30 @@ screenhack_record_anim_init (Screen *screen, Window window, int target_frames)
 # endif /* !USE_GL */
 
 
-# ifndef HAVE_COCOA
+# ifndef HAVE_JWXYZ
   XFetchName (dpy, st->window, &st->title);
-# endif /* !HAVE_COCOA */
+# endif /* !HAVE_JWXYZ */
 
   return st;
 }
 
 
+/* Fade to black. Assumes data is 3-byte packed.
+ */
+static void
+fade_frame (record_anim_state *st, unsigned char *data, double ratio)
+{
+  int x, y, i;
+  int w = st->xgwa.width;
+  int h = st->xgwa.height;
+  unsigned char *s = data;
+  for (y = 0; y < h; y++)
+    for (x = 0; x < w; x++)
+      for (i = 0; i < 3; i++)
+        *s++ *= ratio;
+}
+
+
 void
 screenhack_record_anim (record_anim_state *st)
 {
@@ -188,6 +209,14 @@ screenhack_record_anim (record_anim_state *st)
 # endif /* USE_GL */
 
 
+  if (st->frame_count < st->fade_frames)
+    fade_frame (st, (unsigned char *) data,
+                (double) st->frame_count / st->fade_frames);
+  else if (st->frame_count >= st->target_frames - st->fade_frames)
+    fade_frame (st, (unsigned char *) data,
+                (double) (st->target_frames - st->frame_count - 1) /
+                st->fade_frames);
+
 # ifdef HAVE_GDK_PIXBUF
   {
     const char *type = "png";
@@ -217,7 +246,7 @@ screenhack_record_anim (record_anim_state *st)
 #  error GDK_PIXBUF is required
 # endif /* !HAVE_GDK_PIXBUF */
 
-# ifndef HAVE_COCOA
+# ifndef HAVE_JWXYZ
   {  /* Put percent done in window title */
     int pct = 100 * (st->frame_count + 1) / st->target_frames;
     if (pct != st->pct && st->title)
@@ -231,7 +260,7 @@ screenhack_record_anim (record_anim_state *st)
         st->pct = pct;
       }
   }
-# endif /* !HAVE_COCOA */
+# endif /* !HAVE_JWXYZ */
 
   if (++st->frame_count >= st->target_frames)
     screenhack_record_anim_free (st);
@@ -278,9 +307,9 @@ screenhack_record_anim_free (record_anim_state *st)
 
   sprintf (cmd,
            "ffmpeg"
-           " -r 30"   /* Must be before -i */
-           " -framerate 30"
-           " -i '%s-%%06d.%s'",
+           " -framerate 30"    /* rate of input: must be before -i */
+           " -i '%s-%%06d.%s'"
+           " -r 30",           /* rate of output: must be after -i */
            progname, type);
   if (soundtrack)
     sprintf (cmd + strlen(cmd),