LCD core move buf ptr and address look up function viewport struct

I'm currently running up against the limitations of the lcd_draw functions
I want these functions to be able to be used on any size buffer not
just buffers with a stride matching the underlying device

[DONE] allow the framebuffer to be decoupled from the device framebuffer
[DONE need examples] allow for some simple blit like transformations
[DONE] remove the device framebuffer from the plugin api
[DONE}ditto remote framebuffer
[DONE] remove _viewport_get_framebuffer you can call struct *vp = lcd_set_viewport(NULL) and vp->buffer->fb_ptr

while remote lcds may compile (and work in the sim) its not been tested on targets

[FIXED] backdrops need work to be screen agnostic

[FIXED] screen statusbar is not being combined into the main viewport correctly yet

[FIXED] screen elements are displayed incorrectly  after switch to void*

[FIXED] core didn't restore proper viewport on splash etc.

[NEEDS TESTING] remote lcd garbled data

[FIXED] osd lib garbled screen on bmp_part

[FIXED] grey_set_vp needs to return old viewport like lcd_set_viewport

[FIXED] Viewport update now handles viewports with differing buffers/strides by copying to the main buffer

[FIXED] splash on top of WPS leaves old framebuffer data (doesn't redraw)
[UPDATE] refined this a bit more to have clear_viewport set the clean bit and have skin_render do its own screen clear
scrolling viewports no longer trigger wps refresh
also fixed a bug where guisyncyesno was displaying and then disappearing

[ADDED!] New LCD macros that allow you to create properly size frame buffers in you desired size without wasting bytes
(LCD_ and LCD_REMOTE_)
LCD_STRIDE(w, h) same as STRIDE_MAIN
LCD_FBSTRIDE(w, h) returns target specific stride for a buffer W x H
LCD_NBELEMS(w, h) returns the number of fb_data sized elemenst needed for a buffer W x H
LCD_NATIVE_STRIDE(s) conversion between rockbox native vertical and lcd native stride (2bitH)
test_viewports.c has an example of usage

[FIXED!!] 2bit targets don't respect non-native strides
[FIXED] Few define snags

Change-Id: I0d04c3834e464eca84a5a715743a297a0cefd0af

1 files changed, 3 insertions, 2 deletions

diff --git a/apps/alarm_menu.c b/apps/alarm_menu.c
index 497747bd7b..62b54a84bb 100644
--- a/apps/alarm_menu.c
+++ b/apps/alarm_menu.c
@@ -60,6 +60,7 @@ int alarm_screen(void)
     bool update = true;
     bool hour_wrapped = false;
     struct viewport vp[NB_SCREENS];
+    struct viewport * last_vp;
 
     rtc_get_alarm(&h, &m);
 
@@ -91,11 +92,11 @@ int alarm_screen(void)
 
         FOR_NB_SCREENS(i)
         {
-            screens[i].set_viewport(&vp[i]);
+            last_vp = screens[i].set_viewport(&vp[i]);
             screens[i].putsf(0, 1, str(LANG_ALARM_MOD_TIME));
             screens[i].putsf(0, 2, "%02d:%02d", h, m);
             screens[i].update_viewport();
-            screens[i].set_viewport(NULL);
+            screens[i].set_viewport(last_vp);
         }
         button = get_action(CONTEXT_SETTINGS,HZ);