gui: bmp.c: fix "no previous prototype" warning ...

The patch fixes these compiler's warnings:

  lib/gui/bmp.c:12:15: warning: no previous prototype for 'bmp_open' [-Wmissing-prototypes]
   struct image *bmp_open(char *inbuf, int insize)
                 ^
  lib/gui/bmp.c:33:6: warning: no previous prototype for 'bmp_close' [-Wmissing-prototypes]
   void bmp_close(struct image *img)
        ^

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

graphics_utils: Let fb_open allocate the screen ...

Allocate the screen dynamically in fb_open. This opens the way to create
a fb_create_screen function which takes a struct fb_info * instead of a
filename. This is suitable for the framebuffer console which already has
a struct fb_info *.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

gui: Fix typo in function name ...

It's a render buffer, not a redering buffer.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

graphic_utils: Add a common namespace to functions ...

This adds a common namespace to the graphic functions. We use
gu_ for graphic_utils.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

bmp support: Use unaligned accessors ...

Some fields in the bmp header are unaligned. Use unaligned accessor
functions to acces them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

barebox: remove double semicolons ...

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

gui: convert the bmp renderer to respect line_length ...

Signed-off-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: fix format specifiers ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

bmp: specify we need to keep the data read from the file ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

gui: blit the surface on demand ...

Do not blit the surface everytime we write an image
As we want to able to render multiple image this will cause 1 blit per image;

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

graphic_utils: introduce common fb_open/close ...

To open, memmap, get the fb_info and if needed allocate the offscreen buffer

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

gui: introduce screen and surface to factorize and simplify code ...

Instead of passing hundreds of parameter, just pass the right structure.

struct screen represent the screen with a without double buffering.
struct surface represent the part of the screen we want to render.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

gui: move gui file to include/gui and lib/gui ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>