[gthumb] preload only 4 images to save some memory

[Paolo Bacchilega <paobac src gnome org>]

commit 94024123f5278f2681bd8a7624f7313a18a63bfe
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon Dec 8 17:11:29 2014 +0100

    preload only 4 images to save some memory
    
    and changed the code to allow different values for the number of
    forward and backward preloaders

 extensions/image_viewer/gth-image-viewer-page.c |   23 ++++++++++-------------
 1 files changed, 10 insertions(+), 13 deletions(-)
---
diff --git a/extensions/image_viewer/gth-image-viewer-page.c b/extensions/image_viewer/gth-image-viewer-page.c
index ebde9cf..e3509cb 100644
--- a/extensions/image_viewer/gth-image-viewer-page.c
+++ b/extensions/image_viewer/gth-image-viewer-page.c
@@ -1069,7 +1069,8 @@ clear_data:
 }
 
 
-#define N_PRELOADERS 4
+#define N_FORWARD_PRELOADERS 2
+#define N_BACKWARD_PRELOADERS 2
 
 
 static void
@@ -1080,8 +1081,8 @@ gth_image_viewer_page_real_view (GthViewerPage *base,
        GthFileStore       *file_store;
        GtkTreeIter         iter;
        int                 i;
-       GthFileData        *next_file_data[N_PRELOADERS];
-       GthFileData        *prev_file_data[N_PRELOADERS];
+       GthFileData        *next_file_data[N_FORWARD_PRELOADERS];
+       GthFileData        *prev_file_data[N_BACKWARD_PRELOADERS];
 
        self = (GthImageViewerPage*) base;
        g_return_if_fail (file_data != NULL);
@@ -1104,24 +1105,24 @@ gth_image_viewer_page_real_view (GthViewerPage *base,
        self->priv->image_changed = FALSE;
        self->priv->loading_image = TRUE;
 
-       for (i = 0; i < N_PRELOADERS; i++) {
+       for (i = 0; i < N_FORWARD_PRELOADERS; i++)
                next_file_data[i] = NULL;
+       for (i = 0; i < N_BACKWARD_PRELOADERS; i++)
                prev_file_data[i] = NULL;
-       }
 
        file_store = gth_browser_get_file_store (self->priv->browser);
        if (gth_file_store_find_visible (file_store, self->priv->file_data->file, &iter)) {
                GtkTreeIter next_iter;
 
                next_iter = iter;
-               for (i = 0; i < N_PRELOADERS; i++) {
+               for (i = 0; i < N_FORWARD_PRELOADERS; i++) {
                        if (! gth_file_store_get_next_visible (file_store, &next_iter))
                                break;
                        next_file_data[i] = gth_file_store_get_file (file_store, &next_iter);
                }
 
                next_iter = iter;
-               for (i = 0; i < N_PRELOADERS; i++) {
+               for (i = 0; i < N_BACKWARD_PRELOADERS; i++) {
                        if (! gth_file_store_get_prev_visible (file_store, &next_iter))
                                break;
                        prev_file_data[i] = gth_file_store_get_file (file_store, &next_iter);
@@ -1136,15 +1137,11 @@ gth_image_viewer_page_real_view (GthViewerPage *base,
                                  NULL,
                                  preloader_load_ready_cb,
                                  self,
-                                 N_PRELOADERS * 2,
+                                 N_FORWARD_PRELOADERS + N_BACKWARD_PRELOADERS,
                                  next_file_data[0],
                                  next_file_data[1],
-                                 next_file_data[2],
-                                 next_file_data[3],
                                  prev_file_data[0],
-                                 prev_file_data[1],
-                                 prev_file_data[2],
-                                 prev_file_data[3]);
+                                 prev_file_data[1]);
 }