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Add plane list operations

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This commit is contained in:
Gregory Nutt 2014-12-06 08:04:57 -06:00
parent 955546b67e
commit 0a355c200a
2 changed files with 225 additions and 8 deletions
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12
graphics/traveler/include/trv_plane.h
View File

@ -144,18 +144,14 @@ void trv_release_planes(void);
uint8_t trv_load_planefile(FAR const char *wldfile);
uint8_t trv_load_planes(FAR FILE *fp);
uint8_t trv_save_planes(const char *wldfile);
FAR struct trv_rect_list_s *trv_new_plance(void);
FAR struct trv_rect_list_s *trv_new_plane(void);
void trv_add_plane(FAR struct trv_rect_list_s *rect,
FAR struct trv_rect_head_s *list);
void trv_merge_planelists(FAR struct trv_rect_head_s *outlist,
FAR struct trv_rect_head_s *inlist);
void trv_remove_plane(FAR struct trv_rect_list_s *rect,
FAR struct trv_rect_head_s *list);
void trv_move_plane(FAR struct trv_rect_list_s *rect,
FAR struct trv_rect_head_s *destlist,
FAR struct trv_rect_head_s *srclist);
struct trv_rect_list_s *trv_find_plane(trv_coord_t h, trv_coord_t v,
trv_coord_t plane,
FAR struct trv_rect_head_s *list);
void trv_merge_planelists(FAR struct trv_rect_head_s *outlist,
FAR struct trv_rect_head_s *inlist);
#endif /* __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_PLANE_H */

221
graphics/traveler/src/trv_plane.c
View File

@ -57,3 +57,224 @@ struct trv_rect_head_s g_zplane; /* list of Z=plane rectangles */
/* "Deallocated" planes are retained in a free list */
struct trv_rect_list_s *g_rect_freelist;
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: trv_add_plane
*
* Description:
* This function adds a plane to a world plane list
*
***************************************************************************/
void trv_add_plane(FAR struct trv_rect_list_s *rect,
FAR struct trv_rect_head_s *list)
{
struct trv_rect_list_s *next;
struct trv_rect_list_s *prev;
/* Search the list to find the location to insert the new rectangle. Each
* is list is maintained in ascending plane order.
*/
for (next = list->head;
((next) && (next->d.plane < rect->d.plane));
next = next->flink);
/* Add the 'rect' to the spot found in the list. Check if the 'rect' lies
* at the end of the list.
*/
if (!next)
{
/* No rectangle with plane larger than the one to be added was found
* in the list. The 'rect' goes at the end of the list.
*/
prev = list->tail;
if (!prev)
{
/* Special case: The list is empty */
rect->flink = NULL;
rect->blink = NULL;
list->head = rect;
list->tail = rect;
}
else
{
rect->flink = NULL;
rect->blink = prev;
prev->flink = rect;
list->tail = rect;
}
}
else
{
/* The 'rect' goes just before 'next' */
prev = next->blink;
if (!prev)
{
/* Special case: Insert at the head of the list */
rect->flink = next;
rect->blink = NULL;
next->blink = rect;
list->head = rect;
}
else
{
/* Insert in the middle of the list */
rect->flink = next;
rect->blink = prev;
prev->flink = rect;
next->blink = rect;
}
}
}
/****************************************************************************
* Name: trv_move_plane
*
* Description:
*
* This function removes the specified plane from the world plane srclist
* then adds it to the world plane destlist
*
***************************************************************************/
void trv_move_plane(FAR struct trv_rect_list_s *rect,
FAR struct trv_rect_head_s *destlist,
FAR struct trv_rect_head_s *srclist)
{
/* Un-hook the backward link to the rect */
if (rect->flink)
{
rect->flink->blink = rect->blink;
}
else
{
srclist->tail = rect->blink;
}
/* Un-hook the forward link to the rect */
if (rect->blink)
{
rect->blink->flink = rect->flink;
}
else
{
srclist->head = rect->flink;
}
/* Then add the rect to the specified list */
trv_add_plane(rect, destlist);
}
/****************************************************************************
* Name: trv_merge_planelists
*
* Description:
* This function concatenates two world plane lists
*
***************************************************************************/
void trv_merge_planelists(FAR struct trv_rect_head_s *outlist,
FAR struct trv_rect_head_s *inlist)
{
struct trv_rect_list_s *inrect;
struct trv_rect_list_s *nextin;
struct trv_rect_list_s *outrect;
struct trv_rect_list_s *prevout;
/* Initialize the inner plane search loop */
outrect = outlist->head;
/* Process every plane in the input plane list */
for (inrect = inlist->head; (inrect); inrect = nextin)
{
nextin = inrect->flink;
/* Search the output plane list to find the location to insert the
* input rectangle. Each is list is maintained in ascending plane
* order.
*/
for (;
outrect && outrect->d.plane < inrect->d.plane;
outrect = outrect->flink);
/* Add the 'inrect' to the spot found in the list. Check if the
* 'inrect' goes at the one of the ends of the list.
*/
if (!outrect)
{
/* No rectangle with plane larger than the one to be added
* was found in the list. The inrect goes at the end of
* the list.
*/
prevout = outlist->tail;
if (!prevout)
{
/* Special case: The list is empty */
inrect->flink = NULL;
inrect->blink = NULL;
outlist->head = inrect;
outlist->tail = inrect;
}
else
{
inrect->flink = NULL;
inrect->blink = prevout;
prevout->flink = inrect;
outlist->tail = inrect;
}
}
else
{
/* The 'inrect' goes just before 'outrect' */
prevout = outrect->blink;
if (!prevout)
{
/* Special case: Insert at the head of the list */
inrect->flink = outrect;
inrect->blink = NULL;
outrect->blink = inrect;
outlist->head = inrect;
}
else
{
/* Insert in the middle of the list */
inrect->flink = outrect;
inrect->blink = prevout;
prevout->flink = inrect;
outrect->blink = inrect;
}
}
/* Set up for the next time through */
outrect = inrect;
}
/* Mark the input list empty */
inlist->head = NULL;
inlist->tail = NULL;
}