added definitions for new screen transition effect (not yet implemented)

[rocksndiamonds.git] / src / libgame / snapshot.c

diff --git a/src/libgame/snapshot.c b/src/libgame/snapshot.c
index 51171d43738d657c6c819f9291e7dcb19939daf6..43a42c34d50920813717c73314337aba168a6ad8 100644 (file)
--- a/src/libgame/snapshot.c
+++ b/src/libgame/snapshot.c
@@ -12,12 +12,30 @@
 #include "snapshot.h"
 
 
-static ListNode *engine_snapshot_list = NULL;
+static ListNode *snapshot_single = NULL;
+static ListNode *snapshot_list = NULL;
+static ListNode *snapshot_current = NULL;
 
-void SaveEngineSnapshotBuffer(void *buffer, int size)
+static int num_snapshots_in_list = 0;
+
+#ifdef DEBUG
+#define DEBUG_SNAPSHOTS                        0
+#endif
+
+#if DEBUG_SNAPSHOTS
+static int num_snapshot_buffers = 0;
+static int num_snapshot_bytes = 0;
+#endif
+
+
+// -----------------------------------------------------------------------------
+// functions for handling buffers for a single snapshot
+// -----------------------------------------------------------------------------
+
+void SaveSnapshotBuffer(ListNode **snapshot_buffers, void *buffer, int size)
 {
-  struct EngineSnapshotNodeInfo *bi =
-    checked_calloc(sizeof(struct EngineSnapshotNodeInfo));
+  struct SnapshotNodeInfo *bi =
+    checked_calloc(sizeof(struct SnapshotNodeInfo));
 
   bi->buffer_orig = buffer;
   bi->buffer_copy = checked_malloc(size);
@@ -25,29 +43,167 @@ void SaveEngineSnapshotBuffer(void *buffer, int size)
 
   memcpy(bi->buffer_copy, buffer, size);
 
-  addNodeToList(&engine_snapshot_list, NULL, bi);
+  addNodeToList(snapshot_buffers, NULL, bi);
+
+#if DEBUG_SNAPSHOTS
+  num_snapshot_buffers++;
+  num_snapshot_bytes += size;
+#endif
 }
 
-static void LoadEngineSnapshotBuffer(struct EngineSnapshotNodeInfo *bi)
+static void LoadSnapshotBuffer(struct SnapshotNodeInfo *bi)
 {
   memcpy(bi->buffer_orig, bi->buffer_copy, bi->size);
 }
 
-void LoadEngineSnapshotBuffers()
+void LoadSnapshotBuffers(ListNode *snapshot_buffers)
+{
+  while (snapshot_buffers != NULL)
+  {
+    LoadSnapshotBuffer((struct SnapshotNodeInfo *)snapshot_buffers->content);
+
+    snapshot_buffers = snapshot_buffers->next;
+  }
+}
+
+static void FreeSnapshotBuffer(void *bi_raw)
 {
-  ListNode *node = engine_snapshot_list;
+  struct SnapshotNodeInfo *bi = (struct SnapshotNodeInfo *)bi_raw;
+
+#if DEBUG_SNAPSHOTS
+  num_snapshot_buffers--;
+  num_snapshot_bytes -= bi->size;
+#endif
+
+  checked_free(bi->buffer_copy);
+  checked_free(bi);
+}
+
+void FreeSnapshotBuffers(ListNode *snapshot_buffers)
+{
+  while (snapshot_buffers != NULL)
+    deleteNodeFromList(&snapshot_buffers, NULL, FreeSnapshotBuffer);
+}
 
-  while (node != NULL)
+// -----------------------------------------------------------------------------
+// functions for handling single shapshot or list of snapshots
+// -----------------------------------------------------------------------------
+
+static void FreeSnapshot(void *snapshot_buffers_ptr)
+{
+  FreeSnapshotBuffers(snapshot_buffers_ptr);
+}
+
+void FreeSnapshotSingle()
+{
+  FreeSnapshotBuffers(snapshot_single);
+
+  snapshot_single = NULL;
+}
+
+static void FreeSnapshotList_UpToNode(ListNode *node)
+{
+  while (snapshot_list != node)
   {
-    LoadEngineSnapshotBuffer((struct EngineSnapshotNodeInfo *)node->content);
+#if DEBUG_SNAPSHOTS
+    printf("::: FreeSnapshotList_*() [%s, %d, %d]\n",
+          snapshot_list->key, num_snapshot_buffers, num_snapshot_bytes);
+#endif
 
-    node = node->next;
+    deleteNodeFromList(&snapshot_list, snapshot_list->key, FreeSnapshot);
+
+    num_snapshots_in_list--;
   }
 }
 
-void FreeEngineSnapshotBuffers()
+void FreeSnapshotList()
+{
+#if DEBUG_SNAPSHOTS
+  printf("::: FreeSnapshotList()\n");
+#endif
+
+  FreeSnapshotList_UpToNode(NULL);
+
+  snapshot_current = NULL;
+}
+
+void SaveSnapshotSingle(ListNode *snapshot_buffers)
+{
+  if (snapshot_single)
+    FreeSnapshotSingle();
+
+  snapshot_single = snapshot_buffers;
+}
+
+void SaveSnapshotToList(ListNode *snapshot_buffers)
+{
+  if (snapshot_current != snapshot_list)
+    FreeSnapshotList_UpToNode(snapshot_current);
+
+  addNodeToList(&snapshot_list, i_to_a(num_snapshots_in_list),
+               snapshot_buffers);
+
+  snapshot_current = snapshot_list;
+
+  num_snapshots_in_list++;
+
+#if DEBUG_SNAPSHOTS
+  printf("::: SaveSnapshotToList() [%s, %d, %d]\n",
+        snapshot_current->key, num_snapshot_buffers, num_snapshot_bytes);
+#endif
+}
+
+boolean LoadSnapshotSingle()
+{
+  if (snapshot_single)
+  {
+    LoadSnapshotBuffers(snapshot_single);
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+boolean LoadSnapshotFromList_Older(int steps)
+{
+  if (snapshot_current && snapshot_current->next)
+  {
+    while (snapshot_current->next && steps--)
+      snapshot_current = snapshot_current->next;
+
+    LoadSnapshotBuffers(snapshot_current->content);
+
+#if DEBUG_SNAPSHOTS
+    printf("::: LoadSnapshotFromList_Older() [%s]\n", snapshot_current->key);
+#endif
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+boolean LoadSnapshotFromList_Newer(int steps)
+{
+  if (snapshot_current && snapshot_current->prev)
+  {
+    while (snapshot_current->prev && steps--)
+      snapshot_current = snapshot_current->prev;
+
+    LoadSnapshotBuffers(snapshot_current->content);
+
+#if DEBUG_SNAPSHOTS
+    printf("::: LoadSnapshotFromList_Newer() [%s]\n", snapshot_current->key);
+#endif
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+boolean CheckSnapshotList()
 {
-  while (engine_snapshot_list != NULL)
-    deleteNodeFromList(&engine_snapshot_list, engine_snapshot_list->key,
-                      checked_free);
+  return (snapshot_list ? TRUE : FALSE);
 }