Rockbox

in current svn, reusing buffer works only if both skins don't contais %X tag.
the cause is:
if the skin contains %X tag, string passed to skin_backdrop_load as backdrop is somthing like "sbsback.bmp|\n%Vi|14|66|212|224|1|000000|ffffff|\n..." and will be stored to bdrop->name as "sbsback.bmp|\n%Vi|14|66|212|224|1|0000".
so, comparing passed backdrop and bdrop->name will always fail.

attached correct_reusing_backdrop.diff changes this like follows:
change size of bdrop->name to MAX_PATH,
use filename which is fullpath of the file for both comparing and stored value.

improve_set_as_backdrop.diff improve "Set as backdrop" functionality.
it fix that, after N times of failure of "Set As Backdrop" or "Clear Backdrop", "Set As Backdrop" always fails until reloading a skin becase of lack of memory.
instead of allocating buffer by skin_buffer_alloc(), add new function skin_backdrop_getbuffer() and pass "-" as filename to get same buffer for the backdrop used in sb_set_backdrop().

 apps/gui/statusbar-skinned.c          |   13 +----
 apps/gui/skin_engine/skin_engine.h    |    2 
 apps/gui/skin_engine/skin_backdrops.c |   78 +++++++++++++++++++++-------------
 3 files changed, 55 insertions(+), 38 deletions(-)

 apps/gui/statusbar-skinned.c          |   13 +----
 apps/gui/skin_engine/skin_engine.h    |    2 
 apps/gui/skin_engine/skin_backdrops.c |   78 +++++++++++++++++++++-------------
 3 files changed, 55 insertions(+), 38 deletions(-)