120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/****************************************************************************
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* apps/graphics/traveler/tools/libwld/wld_addplane.c
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* This file contains the logic to add a plane to a world plane list
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/*************************************************************************
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* Included files
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*************************************************************************/
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#include <stdio.h>
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#include "wld_plane.h"
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/*************************************************************************
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* Public Functions
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*************************************************************************/
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/*************************************************************************
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* Name: wld_add_plane
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* Description:
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* This function adds a plane to a world plane list
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************************************************************************/
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void wld_add_plane(rect_list_t * newRect, rect_head_t * list)
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{
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rect_list_t *next;
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rect_list_t *prev;
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/* Search the list to find the location to insert the new rectangle. Each
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* list is maintained in ascending plane order.
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*/
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for (next = list->head;
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((next) && (next->d.plane < newRect->d.plane));
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next = next->flink);
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/* Add the newRect to the spot found in the list. Check if the newRect goes
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* at the end of the list.
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*/
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if (!next)
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{
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/* No rectangle with plane larger than the one to be added was found in
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* the list. The newRect goes at the end of the list.
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*/
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prev = list->tail;
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if (!prev)
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{
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/* Special case: The list is empty */
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newRect->flink = NULL;
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newRect->blink = NULL;
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list->head = newRect;
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list->tail = newRect;
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}
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else
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{
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newRect->flink = NULL;
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newRect->blink = prev;
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prev->flink = newRect;
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list->tail = newRect;
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}
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}
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else
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{
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/* The newRect goes just before next */
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prev = next->blink;
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if (!prev)
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{
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/* Special case: Insert at the head of the list */
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newRect->flink = next;
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newRect->blink = NULL;
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next->blink = newRect;
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list->head = newRect;
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}
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else
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{
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/* Insert in the middle of the list */
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newRect->flink = next;
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newRect->blink = prev;
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prev->flink = newRect;
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next->blink = newRect;
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}
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}
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}
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