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comparison: gfx/skia/trunk/include/core/SkLineClipper.h
gfx/skia/trunk/include/core/SkLineClipper.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:b0a29e88af09 |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #ifndef SkLineClipper_DEFINED | |
| 9 #define SkLineClipper_DEFINED | |
| 10 | |
| 11 #include "SkRect.h" | |
| 12 #include "SkPoint.h" | |
| 13 | |
| 14 class SkLineClipper { | |
| 15 public: | |
| 16 enum { | |
| 17 kMaxPoints = 4, | |
| 18 kMaxClippedLineSegments = kMaxPoints - 1 | |
| 19 }; | |
| 20 | |
| 21 /* Clip the line pts[0]...pts[1] against clip, ignoring segments that | |
| 22 lie completely above or below the clip. For portions to the left or | |
| 23 right, turn those into vertical line segments that are aligned to the | |
| 24 edge of the clip. | |
| 25 | |
| 26 Return the number of line segments that result, and store the end-points | |
| 27 of those segments sequentially in lines as follows: | |
| 28 1st segment: lines[0]..lines[1] | |
| 29 2nd segment: lines[1]..lines[2] | |
| 30 3rd segment: lines[2]..lines[3] | |
| 31 */ | |
| 32 static int ClipLine(const SkPoint pts[2], const SkRect& clip, | |
| 33 SkPoint lines[kMaxPoints]); | |
| 34 | |
| 35 /* Intersect the line segment against the rect. If there is a non-empty | |
| 36 resulting segment, return true and set dst[] to that segment. If not, | |
| 37 return false and ignore dst[]. | |
| 38 | |
| 39 ClipLine is specialized for scan-conversion, as it adds vertical | |
| 40 segments on the sides to show where the line extended beyond the | |
| 41 left or right sides. IntersectLine does not. | |
| 42 */ | |
| 43 static bool IntersectLine(const SkPoint src[2], const SkRect& clip, | |
| 44 SkPoint dst[2]); | |
| 45 }; | |
| 46 | |
| 47 #endif |
