reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/sgl/SkEdge.h |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #ifndef SkEdge_DEFINED |
| 19 | #define SkEdge_DEFINED |
| 20 | |
| 21 | #include "SkRect.h" |
| 22 | |
| 23 | struct SkEdge { |
| 24 | enum Type { |
| 25 | kLine_Type, |
| 26 | kQuad_Type, |
| 27 | kCubic_Type |
| 28 | }; |
| 29 | |
| 30 | SkEdge* fNext; |
| 31 | SkEdge* fPrev; |
| 32 | |
| 33 | SkFixed fX; |
| 34 | SkFixed fDX; |
| 35 | int32_t fFirstY; |
| 36 | int32_t fLastY; |
| 37 | int8_t fCurveCount; // only used by kQuad(+) and kCubic(-) |
| 38 | uint8_t fCurveShift; // appled to all Dx/DDx/DDDx except for fCubicDShift exception |
| 39 | uint8_t fCubicDShift; // applied to fCDx and fCDy only in cubic |
| 40 | int8_t fWinding; // 1 or -1 |
| 41 | |
| 42 | int setLine(const SkPoint& p0, const SkPoint& p1, const SkIRect* clip, |
| 43 | int shiftUp); |
| 44 | inline int updateLine(SkFixed ax, SkFixed ay, SkFixed bx, SkFixed by); |
| 45 | void chopLineWithClip(const SkIRect& clip); |
| 46 | |
| 47 | inline bool intersectsClip(const SkIRect& clip) const { |
| 48 | SkASSERT(fFirstY < clip.fBottom); |
| 49 | return fLastY >= clip.fTop; |
| 50 | } |
| 51 | |
| 52 | #ifdef SK_DEBUG |
| 53 | void dump() const { |
| 54 | #ifdef SK_CAN_USE_FLOAT |
| 55 | SkDebugf("edge: firstY:%d lastY:%d x:%g dx:%g w:%d\n", fFirstY, fLastY, SkFixedToFloat(fX), SkFixedToFloat(fDX), fWinding); |
| 56 | #else |
| 57 | SkDebugf("edge: firstY:%d lastY:%d x:%x dx:%x w:%d\n", fFirstY, fLastY, fX, fDX, fWinding); |
| 58 | #endif |
| 59 | } |
| 60 | |
| 61 | void validate() const { |
| 62 | SkASSERT(fPrev && fNext); |
| 63 | SkASSERT(fPrev->fNext == this); |
| 64 | SkASSERT(fNext->fPrev == this); |
| 65 | |
| 66 | SkASSERT(fFirstY <= fLastY); |
| 67 | SkASSERT(SkAbs32(fWinding) == 1); |
| 68 | } |
| 69 | #endif |
| 70 | }; |
| 71 | |
| 72 | struct SkQuadraticEdge : public SkEdge { |
| 73 | SkFixed fQx, fQy; |
| 74 | SkFixed fQDx, fQDy; |
| 75 | SkFixed fQDDx, fQDDy; |
| 76 | SkFixed fQLastX, fQLastY; |
| 77 | |
reed@android.com | c07d23a | 2009-02-06 13:30:58 +0000 | [diff] [blame] | 78 | int setQuadratic(const SkPoint pts[3], int shiftUp); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 79 | int updateQuadratic(); |
| 80 | }; |
| 81 | |
| 82 | struct SkCubicEdge : public SkEdge { |
| 83 | SkFixed fCx, fCy; |
| 84 | SkFixed fCDx, fCDy; |
| 85 | SkFixed fCDDx, fCDDy; |
| 86 | SkFixed fCDDDx, fCDDDy; |
| 87 | SkFixed fCLastX, fCLastY; |
| 88 | |
| 89 | int setCubic(const SkPoint pts[4], const SkIRect* clip, int shiftUp); |
| 90 | int updateCubic(); |
| 91 | }; |
| 92 | |
| 93 | #endif |