| 1 | /*********************************************************** |
| 2 | |
| 3 | Copyright 1987, 1998 The Open Group |
| 4 | |
| 5 | Permission to use, copy, modify, distribute, and sell this software and its |
| 6 | documentation for any purpose is hereby granted without fee, provided that |
| 7 | the above copyright notice appear in all copies and that both that |
| 8 | copyright notice and this permission notice appear in supporting |
| 9 | documentation. |
| 10 | |
| 11 | The above copyright notice and this permission notice shall be included in |
| 12 | all copies or substantial portions of the Software. |
| 13 | |
| 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 17 | OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| 18 | AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 19 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 20 | |
| 21 | Except as contained in this notice, the name of The Open Group shall not be |
| 22 | used in advertising or otherwise to promote the sale, use or other dealings |
| 23 | in this Software without prior written authorization from The Open Group. |
| 24 | |
| 25 | Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. |
| 26 | |
| 27 | All Rights Reserved |
| 28 | |
| 29 | Permission to use, copy, modify, and distribute this software and its |
| 30 | documentation for any purpose and without fee is hereby granted, |
| 31 | provided that the above copyright notice appear in all copies and that |
| 32 | both that copyright notice and this permission notice appear in |
| 33 | supporting documentation, and that the name of Digital not be |
| 34 | used in advertising or publicity pertaining to distribution of the |
| 35 | software without specific, written prior permission. |
| 36 | |
| 37 | DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING |
| 38 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL |
| 39 | DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR |
| 40 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 41 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, |
| 42 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 43 | SOFTWARE. |
| 44 | |
| 45 | ******************************************************************/ |
| 46 | #ifdef HAVE_DIX_CONFIG_H |
| 47 | #include <dix-config.h> |
| 48 | #endif |
| 49 | |
| 50 | #include "regionstr.h" |
| 51 | #include "mistruct.h" |
| 52 | #include "mifpoly.h" |
| 53 | |
| 54 | void |
| 55 | miStepDash(int dist, /* distance to step */ |
| 56 | int *pDashIndex, /* current dash */ |
| 57 | unsigned char *pDash, /* dash list */ |
| 58 | int numInDashList, /* total length of dash list */ |
| 59 | int *pDashOffset /* offset into current dash */ |
| 60 | ) |
| 61 | { |
| 62 | int dashIndex, dashOffset; |
| 63 | int totallen; |
| 64 | int i; |
| 65 | |
| 66 | dashIndex = *pDashIndex; |
| 67 | dashOffset = *pDashOffset; |
| 68 | if (dist < pDash[dashIndex] - dashOffset) { |
| 69 | *pDashOffset = dashOffset + dist; |
| 70 | return; |
| 71 | } |
| 72 | dist -= pDash[dashIndex] - dashOffset; |
| 73 | if (++dashIndex == numInDashList) |
| 74 | dashIndex = 0; |
| 75 | totallen = 0; |
| 76 | for (i = 0; i < numInDashList; i++) |
| 77 | totallen += pDash[i]; |
| 78 | if (totallen <= dist) |
| 79 | dist = dist % totallen; |
| 80 | while (dist >= pDash[dashIndex]) { |
| 81 | dist -= pDash[dashIndex]; |
| 82 | if (++dashIndex == numInDashList) |
| 83 | dashIndex = 0; |
| 84 | } |
| 85 | *pDashIndex = dashIndex; |
| 86 | *pDashOffset = dist; |
| 87 | } |