Reuse the backdrop buffers if 2 skins use the same backdrop (on the same screen of course)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24690 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 130 insertions, 41 deletions

diff --git a/apps/gui/skin_engine/skin_backdrops.c b/apps/gui/skin_engine/skin_backdrops.c
new file mode 100644
index 0000000000..b057935241
--- /dev/null
+++ b/apps/gui/skin_engine/skin_backdrops.c
@@ -0,0 +1,119 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: skin_tokens.c 24526 2010-02-05 23:58:53Z jdgordon $
+ *
+ * Copyright (C) 2010 Jonathan Gordon
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "settings.h"
+#include "skin_buffer.h"
+#include "wps_internals.h"
+#include "skin_engine.h"
+
+#if (LCD_DEPTH > 1) || (defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH > 1))
+
+static struct skin_backdrop {
+    char name[MAX_FILENAME+1];
+    char *buffer;
+    enum screen_type screen;
+} backdrops[SKINNABLE_SCREENS_COUNT*NB_SCREENS];
+
+void skin_backdrop_init(void)
+{
+    int i;
+    for(i=0;i<SKINNABLE_SCREENS_COUNT*NB_SCREENS;i++)
+    {
+        backdrops[i].name[0] = '\0';
+        backdrops[i].buffer = NULL;
+    }
+}
+
+/* load a backdrop into the skin buffer.
+ * reuse buffers if the file is already loaded */
+char* skin_backdrop_load(char* backdrop, char *bmpdir, enum screen_type screen)
+{
+    int i;
+    struct skin_backdrop *bdrop = NULL;
+    char filename[MAX_PATH];
+    size_t buf_size;
+    bool loaded = false;
+#if defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH > 1)
+    if (screen == SCREEN_REMOTE)
+        buf_size = REMOTE_LCD_BACKDROP_BYTES;
+    else
+#endif
+        buf_size = LCD_BACKDROP_BYTES;
+    
+    if (backdrop[0] == '-')
+    {
+#if NB_SCREENS > 1
+        if (screen == SCREEN_REMOTE)
+        {
+            return NULL; /* remotes don't have a backdrop setting (yet!) */
+        }
+        else
+#endif
+        {
+            if (!global_settings.backdrop_file[0])
+            {
+                return NULL; /* backdrop setting not set */
+            }
+            snprintf(filename, sizeof(filename), "%s/%s.bmp",
+                     BACKDROP_DIR, global_settings.backdrop_file);
+        }
+    }
+    else
+    {
+        get_image_filename(backdrop, bmpdir, filename, sizeof(filename));
+    }
+    
+    for(i=0;i<SKINNABLE_SCREENS_COUNT*NB_SCREENS;i++)
+    {
+        if (!strcmp(backdrops[i].name, backdrop) && backdrops[i].screen == screen)
+        {
+            return backdrops[i].buffer;
+        }
+        else if (backdrops[i].buffer == NULL)
+        {
+            bdrop = &backdrops[i];
+        }
+    }
+    if (!bdrop)
+        return NULL; /* too many backdrops loaded */
+    
+    bdrop->buffer = skin_buffer_alloc(buf_size);
+    if (!bdrop->buffer)
+        return NULL;
+    loaded = screens[screen].backdrop_load(filename, bdrop->buffer);
+    bdrop->screen = screen;
+    strlcpy(bdrop->name, backdrop, MAX_FILENAME+1);
+    bdrop->name[MAX_FILENAME] = '\0';
+    
+    return loaded ? bdrop->buffer : NULL;
+}
+#else
+
+void skin_backdrop_init(void)
+{
+}
+#endif
+
diff --git a/apps/gui/skin_engine/skin_engine.h b/apps/gui/skin_engine/skin_engine.h
index c5afe3e9f5..642f15aaad 100644
--- a/apps/gui/skin_engine/skin_engine.h
+++ b/apps/gui/skin_engine/skin_engine.h
@@ -60,4 +60,10 @@ void skin_data_init(struct wps_data *wps_data);
 
 /* call this in statusbar toggle handlers if needed */
 void skin_statusbar_changed(struct gui_wps*);
+
+
+/* load a backdrop into the skin buffer.
+ * reuse buffers if the file is already loaded */
+char* skin_backdrop_load(char* backdrop, char *bmpdir, enum screen_type screen);
+void skin_backdrop_init(void);
 #endif
diff --git a/apps/gui/skin_engine/skin_parser.c b/apps/gui/skin_engine/skin_parser.c
index 034ff532f0..fe68c7c57e 100644
--- a/apps/gui/skin_engine/skin_parser.c
+++ b/apps/gui/skin_engine/skin_parser.c
@@ -567,7 +567,7 @@ static int get_image_id(int c)
         return -1;
 }
 
-static char *get_image_filename(const char *start, const char* bmpdir,
+char *get_image_filename(const char *start, const char* bmpdir,
                                 char *buf, int buf_size)
 {
     const char *end = strchr(start, '|');
@@ -2045,45 +2045,8 @@ static bool load_skin_bitmaps(struct wps_data *wps_data, char *bmpdir)
      */
     if (wps_data->backdrop)
     {
-        char img_path[MAX_PATH];
-        bool loaded = false;
-        size_t buf_size;
-#if defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH > 1)
-        if (curr_screen == SCREEN_REMOTE)
-            buf_size = REMOTE_LCD_BACKDROP_BYTES;
-        else
-#endif
-            buf_size = LCD_BACKDROP_BYTES;
-        if (wps_data->backdrop[0] == '-')
-        {
-#if NB_SCREENS > 1
-            if (curr_screen == SCREEN_REMOTE)
-            {
-                wps_data->backdrop = NULL;
-                return true;
-            }
-            else
-#endif
-            {
-                if (!global_settings.backdrop_file[0])
-                {
-                    wps_data->backdrop = NULL;
-                    return true;
-                }
-                snprintf(img_path, sizeof(img_path), "%s/%s.bmp",
-                         BACKDROP_DIR, global_settings.backdrop_file);
-            }
-        }
-        else
-        {
-            get_image_filename(wps_data->backdrop, bmpdir,
-                              img_path, sizeof(img_path));
-        }
-        char *buffer = skin_buffer_alloc(buf_size);
-        if (!buffer)
-            return false;
-        loaded = screens[curr_screen].backdrop_load(img_path, buffer);
-        wps_data->backdrop = loaded ? buffer : NULL;
+        wps_data->backdrop = skin_backdrop_load(wps_data->backdrop, 
+                                               bmpdir, curr_screen);
     }
 #endif /* has backdrop support */
 
diff --git a/apps/gui/skin_engine/wps_internals.h b/apps/gui/skin_engine/wps_internals.h
index e659f08d35..04a295a449 100644
--- a/apps/gui/skin_engine/wps_internals.h
+++ b/apps/gui/skin_engine/wps_internals.h
@@ -353,7 +353,8 @@ struct gui_wps
 
 /* gui_wps end */
 
-
+char *get_image_filename(const char *start, const char* bmpdir,
+                                char *buf, int buf_size);
 /***** wps_tokens.c ******/
 
 const char *get_token_value(struct gui_wps *gwps,