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comparison: gfx/skia/trunk/src/core/SkPerspIter.h
gfx/skia/trunk/src/core/SkPerspIter.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:d363da29280a |
|---|---|
| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 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 | |
| 9 | |
| 10 #ifndef SkPerspIter_DEFINED | |
| 11 #define SkPerspIter_DEFINED | |
| 12 | |
| 13 #include "SkMatrix.h" | |
| 14 | |
| 15 class SkPerspIter { | |
| 16 public: | |
| 17 /** Iterate a line through the matrix [x,y] ... [x+count-1, y]. | |
| 18 @param m The matrix we will be iterating a line through | |
| 19 @param x The initial X coordinate to be mapped through the matrix | |
| 20 @param y The initial Y coordinate to be mapped through the matrix | |
| 21 @param count The number of points (x,y) (x+1,y) (x+2,y) ... we will eventually map | |
| 22 */ | |
| 23 SkPerspIter(const SkMatrix& m, SkScalar x, SkScalar y, int count); | |
| 24 | |
| 25 /** Return the buffer of [x,y] fixed point values we will be filling. | |
| 26 This always returns the same value, so it can be saved across calls to | |
| 27 next(). | |
| 28 */ | |
| 29 const SkFixed* getXY() const { return fStorage; } | |
| 30 | |
| 31 /** Return the number of [x,y] pairs that have been filled in the getXY() buffer. | |
| 32 When this returns 0, the iterator is finished. | |
| 33 */ | |
| 34 int next(); | |
| 35 | |
| 36 private: | |
| 37 enum { | |
| 38 kShift = 4, | |
| 39 kCount = (1 << kShift) | |
| 40 }; | |
| 41 const SkMatrix& fMatrix; | |
| 42 SkFixed fStorage[kCount * 2]; | |
| 43 SkFixed fX, fY; | |
| 44 SkScalar fSX, fSY; | |
| 45 int fCount; | |
| 46 }; | |
| 47 | |
| 48 #endif |
