Update histogram when moving frame slider

3 files changed, 15 insertions, 3 deletions

diff --git a/bin/common/ring-buffer.c b/bin/common/ring-buffer.c
index 039024f..850dfc0 100644
--- a/bin/common/ring-buffer.c
+++ b/bin/common/ring-buffer.c
@@ -44,6 +44,14 @@ ring_buffer_get_current_pointer (RingBuffer *buffer)
     return buffer->data + (buffer->current_index % buffer->n_blocks_total) * buffer->block_size;
 }
 
+void
+ring_buffer_set_current_pointer (RingBuffer *buffer,
+                                 guint index)
+{
+    g_assert (index < buffer->n_blocks_total);
+    buffer->current_index = index;
+}
+
 gpointer
 ring_buffer_get_pointer (RingBuffer *buffer,
                          guint       index)
diff --git a/bin/common/ring-buffer.h b/bin/common/ring-buffer.h
index a3758cb..fafe5ec 100644
--- a/bin/common/ring-buffer.h
+++ b/bin/common/ring-buffer.h
@@ -19,6 +19,8 @@ void         ring_buffer_free                 (RingBuffer *buffer);
 void         ring_buffer_reset                (RingBuffer *buffer);
 gsize        ring_buffer_get_block_size       (RingBuffer *buffer);
 gpointer     ring_buffer_get_current_pointer  (RingBuffer *buffer);
+void         ring_buffer_set_current_pointer  (RingBuffer *buffer,
+                                               guint       index);
 gpointer     ring_buffer_get_pointer          (RingBuffer *buffer,
                                                guint       index);
 guint        ring_buffer_get_num_blocks       (RingBuffer *buffer);
diff --git a/bin/gui/control.c b/bin/gui/control.c
index 74b8312..6327366 100644
--- a/bin/gui/control.c
+++ b/bin/gui/control.c
@@ -397,10 +397,12 @@ static void
 update_current_frame (ThreadData *data)
 {
     gpointer buffer;
-    gint index;
+    guint index;
 
-    index = (gint) gtk_adjustment_get_value (data->frame_slider);
-    buffer = ring_buffer_get_pointer (data->buffer, index);
+    index = (guint) gtk_adjustment_get_value (data->frame_slider);
+    ring_buffer_set_current_pointer (data->buffer, index);
+
+    buffer = ring_buffer_get_current_pointer (data->buffer);
     convert_grayscale_to_rgb (data, buffer);
     update_pixbuf (data);
 }