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, 10 insertions, 3 deletions

diff --git a/apps/plugins/zxbox/zxvid_2bpp.c b/apps/plugins/zxbox/zxvid_2bpp.c
index 9772625387..97e6a5de76 100644
--- a/apps/plugins/zxbox/zxvid_2bpp.c
+++ b/apps/plugins/zxbox/zxvid_2bpp.c
@@ -26,6 +26,8 @@ static const unsigned char graylevels[16] = {
     0, 1, 1, 1, 2, 2, 3, 3
 };
 
+static fb_data *lcd_fb = NULL;
+
 void init_spect_scr(void)
 {
     int i;
@@ -41,6 +43,11 @@ void init_spect_scr(void)
 }
 void update_screen(void)
 {
+    if (!lcd_fb)
+    {
+        struct viewport *vp_main = rb->lcd_set_viewport(NULL);
+        lcd_fb = vp_main->buffer->fb_ptr;
+    }
     fb_data *frameb;
     int y=0;
     int x=0;
@@ -51,7 +58,7 @@ void update_screen(void)
 #if LCD_PIXELFORMAT == HORIZONTAL_PACKING
     for(y = 0; y < LCD_HEIGHT; y++)
     {
-        frameb = *rb->lcd_framebuffer + (y) * FB_WIDTH;
+        frameb = lcd_fb + (y) * FB_WIDTH;
         srcx = 0;           /* reset our x counter before each row... */
         for(x = 0; x < LCD_WIDTH; x++)
         {
@@ -67,7 +74,7 @@ void update_screen(void)
     int shift;
     for(y = 0; y < LCD_HEIGHT; y++)
     {
-        frameb = *rb->lcd_framebuffer + (y/4) * LCD_WIDTH;
+        frameb = lcd_fb + (y/4) * LCD_WIDTH;
         srcx = 0;           /* reset our x counter before each row... */
         shift = ((y & 3 ) * 2 );
         mask = ~pixmask[y & 3];
@@ -84,7 +91,7 @@ void update_screen(void)
     int shift;
     for(y = 0; y < LCD_HEIGHT; y++)
     {
-        frameb = *rb->lcd_framebuffer + (y/8) * LCD_WIDTH;
+        frameb = lcd_fb + (y/8) * LCD_WIDTH;
         srcx = 0;           /* reset our x counter before each row... */
         shift = (y & 7);
         mask = ~pixmask[y & 7];