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lcd/skin_engine: Add the ability to draw onto the backdrop layer

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The framebuffer the lcd driver uses can now be changed on the fly
which means that regular lcd_* drawing functions can draw onto the
"backdrop" buffer. The skin engine can use this to create layered
effects.

Add the tag %VB to a viewport to draw that viewport onto the
backdrop layer. If you want to draw an image onto the backdrop
framebuffer use %x(backdrop filename) instead of %X() inside
a viewport with %VB.

Change-Id: I741498e2af6d4f2d78932cabe8942317893e7cfc
This commit is contained in:
Jonathan Gordon 2012-02-28 22:26:32 +11:00
parent 13f98df5ed
commit 2c71aa9feb
13 changed files with 87 additions and 10 deletions
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34
apps/gui/skin_engine/skin_backdrops.c
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@ -95,6 +95,10 @@ int skin_backdrop_assign(char* backdrop, char *bmpdir,
filename[2] = '\0'; /* we check this later to see if we actually have an
image to load. != '\0' means display the image */
}
else if (!strcmp(backdrop, BACKDROP_BUFFERNAME))
{
strcpy(filename, backdrop);
}
else
{
get_image_filename(backdrop, bmpdir, filename, sizeof(filename));
@ -156,15 +160,20 @@ bool skin_backdrops_preload(void)
{
backdrops[i].buffer = core_get_data(backdrops[i].buflib_handle);
handle_being_loaded = backdrops[i].buflib_handle;
backdrops[i].loaded =
screens[screen].backdrop_load(filename, backdrops[i].buffer);
handle_being_loaded = -1;
if (!backdrops[i].loaded)
if (strcmp(filename, BACKDROP_BUFFERNAME))
{
core_free(backdrops[i].buflib_handle);
backdrops[i].buflib_handle = -1;
retval = false;
backdrops[i].loaded =
screens[screen].backdrop_load(filename, backdrops[i].buffer);
handle_being_loaded = -1;
if (!backdrops[i].loaded)
{
core_free(backdrops[i].buflib_handle);
backdrops[i].buflib_handle = -1;
retval = false;
}
}
else
backdrops[i].loaded = true;
}
else
retval = false;
@ -176,10 +185,21 @@ bool skin_backdrops_preload(void)
return retval;
}
void* skin_backdrop_get_buffer(int backdrop_id)
{
if (backdrop_id < 0)
return NULL;
return backdrops[backdrop_id].buffer;
}
void skin_backdrop_show(int backdrop_id)
{
if (backdrop_id < 0)
{
screens[0].backdrop_show(NULL);
current_lcd_backdrop[0] = -1;
return;
}
enum screen_type screen = backdrops[backdrop_id].screen;
if ((backdrops[backdrop_id].loaded == false) ||
(backdrops[backdrop_id].name[0] == '-' &&