dlls/gdiplus/pathiterator.c

   1 /*
   2  * Copyright (C) 2007 Google (Evan Stade)
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20
  21 #include "windef.h"
  22 #include "winbase.h"
  23 #include "wingdi.h"
  24
  25 #include "objbase.h"
  26
  27 #include "gdiplus.h"
  28 #include "gdiplus_private.h"
  29
  30 GpStatus WINGDIPAPI GdipCreatePathIter(GpPathIterator **iterator, GpPath* path)
  31 {
  32     INT size;
  33
  34     if(!iterator || !path)
  35         return InvalidParameter;
  36
  37     size = path->pathdata.Count;
  38
  39     *iterator = GdipAlloc(sizeof(GpPathIterator));
  40     if(!*iterator)  return OutOfMemory;
  41
  42     (*iterator)->pathdata.Types = GdipAlloc(size);
  43     (*iterator)->pathdata.Points = GdipAlloc(size * sizeof(PointF));
  44
  45     memcpy((*iterator)->pathdata.Types, path->pathdata.Types, size);
  46     memcpy((*iterator)->pathdata.Points, path->pathdata.Points,
  47            size * sizeof(PointF));
  48     (*iterator)->pathdata.Count = size;
  49
  50     (*iterator)->subpath_pos = 0;
  51     (*iterator)->marker_pos = 0;
  52     (*iterator)->pathtype_pos = 0;
  53
  54     return Ok;
  55 }
  56
  57 GpStatus WINGDIPAPI GdipDeletePathIter(GpPathIterator *iter)
  58 {
  59     if(!iter)
  60         return InvalidParameter;
  61
  62     GdipFree(iter->pathdata.Types);
  63     GdipFree(iter->pathdata.Points);
  64     GdipFree(iter);
  65
  66     return Ok;
  67 }
  68
  69 GpStatus WINGDIPAPI GdipPathIterCopyData(GpPathIterator* iterator,
  70     INT* resultCount, GpPointF* points, BYTE* types, INT startIndex, INT endIndex)
  71 {
  72     if(!iterator || !types || !points)
  73         return InvalidParameter;
  74
  75     if(endIndex > iterator->pathdata.Count - 1 || startIndex < 0 ||
  76         endIndex < startIndex){
  77         *resultCount = 0;
  78         return Ok;
  79     }
  80
  81     *resultCount = endIndex - startIndex + 1;
  82
  83     memcpy(types, &(iterator->pathdata.Types[startIndex]), *resultCount);
  84     memcpy(points, &(iterator->pathdata.Points[startIndex]),
  85         *resultCount * sizeof(PointF));
  86
  87     return Ok;
  88 }
  89
  90 GpStatus WINGDIPAPI GdipPathIterNextSubpath(GpPathIterator* iterator,
  91     INT *resultCount, INT* startIndex, INT* endIndex, BOOL* isClosed)
  92 {
  93     INT i, count;
  94
  95     if(!iterator)
  96         return InvalidParameter;
  97
  98     count = iterator->pathdata.Count;
  99
 100     if(iterator->subpath_pos == count){
 101         *startIndex = *endIndex = *resultCount = 0;
 102         *isClosed = 1;
 103         return Ok;
 104     }
 105
 106     *startIndex = iterator->subpath_pos;
 107
 108     for(i = iterator->subpath_pos + 1; i < count &&
 109         !(iterator->pathdata.Types[i] == PathPointTypeStart); i++);
 110
 111     *endIndex = i - 1;
 112     iterator->subpath_pos = i;
 113
 114     *resultCount = *endIndex - *startIndex + 1;
 115
 116     if(iterator->pathdata.Types[*endIndex] & PathPointTypeCloseSubpath)
 117         *isClosed = TRUE;
 118     else
 119         *isClosed = FALSE;
 120
 121     return Ok;
 122 }
 123 GpStatus WINGDIPAPI GdipPathIterRewind(GpPathIterator *iterator)
 124 {
 125     if(!iterator)
 126         return InvalidParameter;
 127
 128     iterator->subpath_pos = 0;
 129     iterator->marker_pos = 0;
 130     iterator->pathtype_pos = 0;
 131
 132     return Ok;
 133 }