Adapt icon and skin engine to make use of the new 32bit bitmap capabilities.

You can now use 32bit icons in lists and skins
(except album art, but can be added if wanted). The code also shows how
to free the unused alpha channel data if the bitmap doesn't actually contain
such information.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30939 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 1 deletions

diff --git a/apps/gui/icon.c b/apps/gui/icon.c
index 4c006f947a..d24d8bb677 100644
--- a/apps/gui/icon.c
+++ b/apps/gui/icon.c
@@ -189,7 +189,7 @@ static void load_icons(const char* filename, enum Iconset iconset,
                         enum screen_type screen)
 {
     int size_read;
-    int bmpformat = (FORMAT_NATIVE|FORMAT_DITHER);
+    int bmpformat = (FORMAT_NATIVE|FORMAT_DITHER|FORMAT_TRANSPARENT);
     struct iconset *ic = &iconsets[iconset][screen];
     int fd;
     
@@ -217,6 +217,9 @@ static void load_icons(const char* filename, enum Iconset iconset,
         size_read = read_bmp_fd(fd, &ic->bmp, buf_size, bmpformat, NULL);
         ic->handle_locked = 0;
 
+        /* free unused alpha channel, if any */
+        core_shrink(ic->handle, ic->bmp.data, size_read);
+
         if (size_read <= 0)
             ic->handle = core_free(ic->handle);
         else