epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame^] | 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 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 9 | |
| 10 | #ifndef SkEdge_DEFINED |
| 11 | #define SkEdge_DEFINED |
| 12 | |
| 13 | #include "SkRect.h" |
| 14 | |
| 15 | struct SkEdge { |
| 16 | enum Type { |
| 17 | kLine_Type, |
| 18 | kQuad_Type, |
| 19 | kCubic_Type |
| 20 | }; |
| 21 | |
| 22 | SkEdge* fNext; |
| 23 | SkEdge* fPrev; |
| 24 | |
| 25 | SkFixed fX; |
| 26 | SkFixed fDX; |
| 27 | int32_t fFirstY; |
| 28 | int32_t fLastY; |
| 29 | int8_t fCurveCount; // only used by kQuad(+) and kCubic(-) |
| 30 | uint8_t fCurveShift; // appled to all Dx/DDx/DDDx except for fCubicDShift exception |
| 31 | uint8_t fCubicDShift; // applied to fCDx and fCDy only in cubic |
| 32 | int8_t fWinding; // 1 or -1 |
| 33 | |
| 34 | int setLine(const SkPoint& p0, const SkPoint& p1, const SkIRect* clip, |
| 35 | int shiftUp); |
| 36 | inline int updateLine(SkFixed ax, SkFixed ay, SkFixed bx, SkFixed by); |
| 37 | void chopLineWithClip(const SkIRect& clip); |
| 38 | |
| 39 | inline bool intersectsClip(const SkIRect& clip) const { |
| 40 | SkASSERT(fFirstY < clip.fBottom); |
| 41 | return fLastY >= clip.fTop; |
| 42 | } |
| 43 | |
| 44 | #ifdef SK_DEBUG |
| 45 | void dump() const { |
| 46 | #ifdef SK_CAN_USE_FLOAT |
| 47 | SkDebugf("edge: firstY:%d lastY:%d x:%g dx:%g w:%d\n", fFirstY, fLastY, SkFixedToFloat(fX), SkFixedToFloat(fDX), fWinding); |
| 48 | #else |
| 49 | SkDebugf("edge: firstY:%d lastY:%d x:%x dx:%x w:%d\n", fFirstY, fLastY, fX, fDX, fWinding); |
| 50 | #endif |
| 51 | } |
| 52 | |
| 53 | void validate() const { |
| 54 | SkASSERT(fPrev && fNext); |
| 55 | SkASSERT(fPrev->fNext == this); |
| 56 | SkASSERT(fNext->fPrev == this); |
| 57 | |
| 58 | SkASSERT(fFirstY <= fLastY); |
| 59 | SkASSERT(SkAbs32(fWinding) == 1); |
| 60 | } |
| 61 | #endif |
| 62 | }; |
| 63 | |
| 64 | struct SkQuadraticEdge : public SkEdge { |
| 65 | SkFixed fQx, fQy; |
| 66 | SkFixed fQDx, fQDy; |
| 67 | SkFixed fQDDx, fQDDy; |
| 68 | SkFixed fQLastX, fQLastY; |
| 69 | |
reed@android.com | c07d23a | 2009-02-06 13:30:58 +0000 | [diff] [blame] | 70 | int setQuadratic(const SkPoint pts[3], int shiftUp); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 71 | int updateQuadratic(); |
| 72 | }; |
| 73 | |
| 74 | struct SkCubicEdge : public SkEdge { |
| 75 | SkFixed fCx, fCy; |
| 76 | SkFixed fCDx, fCDy; |
| 77 | SkFixed fCDDx, fCDDy; |
| 78 | SkFixed fCDDDx, fCDDDy; |
| 79 | SkFixed fCLastX, fCLastY; |
| 80 | |
| 81 | int setCubic(const SkPoint pts[4], const SkIRect* clip, int shiftUp); |
| 82 | int updateCubic(); |
| 83 | }; |
| 84 | |
| 85 | #endif |