gfx/skia/trunk/src/core/SkEdge.h@129ffea94266 (annotated)
gfx/skia/trunk/src/core/SkEdge.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | |
| michael@0 | 2 | /* |
| michael@0 | 3 | * Copyright 2006 The Android Open Source Project |
| michael@0 | 4 | * |
| michael@0 | 5 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 6 | * found in the LICENSE file. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | |
| michael@0 | 10 | #ifndef SkEdge_DEFINED |
| michael@0 | 11 | #define SkEdge_DEFINED |
| michael@0 | 12 | |
| michael@0 | 13 | #include "SkRect.h" |
| michael@0 | 14 | #include "SkFDot6.h" |
| michael@0 | 15 | #include "SkMath.h" |
| michael@0 | 16 | |
| michael@0 | 17 | // This correctly favors the lower-pixel when y0 is on a 1/2 pixel boundary |
| michael@0 | 18 | #define SkEdge_Compute_DY(top, y0) ((top << 6) + 32 - (y0)) |
| michael@0 | 19 | |
| michael@0 | 20 | struct SkEdge { |
| michael@0 | 21 | enum Type { |
| michael@0 | 22 | kLine_Type, |
| michael@0 | 23 | kQuad_Type, |
| michael@0 | 24 | kCubic_Type |
| michael@0 | 25 | }; |
| michael@0 | 26 | |
| michael@0 | 27 | SkEdge* fNext; |
| michael@0 | 28 | SkEdge* fPrev; |
| michael@0 | 29 | |
| michael@0 | 30 | SkFixed fX; |
| michael@0 | 31 | SkFixed fDX; |
| michael@0 | 32 | int32_t fFirstY; |
| michael@0 | 33 | int32_t fLastY; |
| michael@0 | 34 | int8_t fCurveCount; // only used by kQuad(+) and kCubic(-) |
| michael@0 | 35 | uint8_t fCurveShift; // appled to all Dx/DDx/DDDx except for fCubicDShift exception |
| michael@0 | 36 | uint8_t fCubicDShift; // applied to fCDx and fCDy only in cubic |
| michael@0 | 37 | int8_t fWinding; // 1 or -1 |
| michael@0 | 38 | |
| michael@0 | 39 | int setLine(const SkPoint& p0, const SkPoint& p1, const SkIRect* clip, |
| michael@0 | 40 | int shiftUp); |
| michael@0 | 41 | // call this version if you know you don't have a clip |
| michael@0 | 42 | inline int setLine(const SkPoint& p0, const SkPoint& p1, int shiftUp); |
| michael@0 | 43 | inline int updateLine(SkFixed ax, SkFixed ay, SkFixed bx, SkFixed by); |
| michael@0 | 44 | void chopLineWithClip(const SkIRect& clip); |
| michael@0 | 45 | |
| michael@0 | 46 | inline bool intersectsClip(const SkIRect& clip) const { |
| michael@0 | 47 | SkASSERT(fFirstY < clip.fBottom); |
| michael@0 | 48 | return fLastY >= clip.fTop; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | #ifdef SK_DEBUG |
| michael@0 | 52 | void dump() const { |
| michael@0 | 53 | SkDebugf("edge: firstY:%d lastY:%d x:%g dx:%g w:%d\n", fFirstY, fLastY, SkFixedToFloat(fX), SkFixedToFloat(fDX), fWinding); |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | void validate() const { |
| michael@0 | 57 | SkASSERT(fPrev && fNext); |
| michael@0 | 58 | SkASSERT(fPrev->fNext == this); |
| michael@0 | 59 | SkASSERT(fNext->fPrev == this); |
| michael@0 | 60 | |
| michael@0 | 61 | SkASSERT(fFirstY <= fLastY); |
| michael@0 | 62 | SkASSERT(SkAbs32(fWinding) == 1); |
| michael@0 | 63 | } |
| michael@0 | 64 | #endif |
| michael@0 | 65 | }; |
| michael@0 | 66 | |
| michael@0 | 67 | struct SkQuadraticEdge : public SkEdge { |
| michael@0 | 68 | SkFixed fQx, fQy; |
| michael@0 | 69 | SkFixed fQDx, fQDy; |
| michael@0 | 70 | SkFixed fQDDx, fQDDy; |
| michael@0 | 71 | SkFixed fQLastX, fQLastY; |
| michael@0 | 72 | |
| michael@0 | 73 | int setQuadratic(const SkPoint pts[3], int shiftUp); |
| michael@0 | 74 | int updateQuadratic(); |
| michael@0 | 75 | }; |
| michael@0 | 76 | |
| michael@0 | 77 | struct SkCubicEdge : public SkEdge { |
| michael@0 | 78 | SkFixed fCx, fCy; |
| michael@0 | 79 | SkFixed fCDx, fCDy; |
| michael@0 | 80 | SkFixed fCDDx, fCDDy; |
| michael@0 | 81 | SkFixed fCDDDx, fCDDDy; |
| michael@0 | 82 | SkFixed fCLastX, fCLastY; |
| michael@0 | 83 | |
| michael@0 | 84 | int setCubic(const SkPoint pts[4], const SkIRect* clip, int shiftUp); |
| michael@0 | 85 | int updateCubic(); |
| michael@0 | 86 | }; |
| michael@0 | 87 | |
| michael@0 | 88 | int SkEdge::setLine(const SkPoint& p0, const SkPoint& p1, int shift) { |
| michael@0 | 89 | SkFDot6 x0, y0, x1, y1; |
| michael@0 | 90 | |
| michael@0 | 91 | { |
| michael@0 | 92 | float scale = float(1 << (shift + 6)); |
| michael@0 | 93 | x0 = int(p0.fX * scale); |
| michael@0 | 94 | y0 = int(p0.fY * scale); |
| michael@0 | 95 | x1 = int(p1.fX * scale); |
| michael@0 | 96 | y1 = int(p1.fY * scale); |
| michael@0 | 97 | } |
| michael@0 | 98 | |
| michael@0 | 99 | int winding = 1; |
| michael@0 | 100 | |
| michael@0 | 101 | if (y0 > y1) { |
| michael@0 | 102 | SkTSwap(x0, x1); |
| michael@0 | 103 | SkTSwap(y0, y1); |
| michael@0 | 104 | winding = -1; |
| michael@0 | 105 | } |
| michael@0 | 106 | |
| michael@0 | 107 | int top = SkFDot6Round(y0); |
| michael@0 | 108 | int bot = SkFDot6Round(y1); |
| michael@0 | 109 | |
| michael@0 | 110 | // are we a zero-height line? |
| michael@0 | 111 | if (top == bot) { |
| michael@0 | 112 | return 0; |
| michael@0 | 113 | } |
| michael@0 | 114 | |
| michael@0 | 115 | SkFixed slope = SkFDot6Div(x1 - x0, y1 - y0); |
| michael@0 | 116 | const int dy = SkEdge_Compute_DY(top, y0); |
| michael@0 | 117 | |
| michael@0 | 118 | fX = SkFDot6ToFixed(x0 + SkFixedMul(slope, dy)); // + SK_Fixed1/2 |
| michael@0 | 119 | fDX = slope; |
| michael@0 | 120 | fFirstY = top; |
| michael@0 | 121 | fLastY = bot - 1; |
| michael@0 | 122 | fCurveCount = 0; |
| michael@0 | 123 | fWinding = SkToS8(winding); |
| michael@0 | 124 | fCurveShift = 0; |
| michael@0 | 125 | return 1; |
| michael@0 | 126 | } |
| michael@0 | 127 | |
| michael@0 | 128 | |
| michael@0 | 129 | #endif |
