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comparison: layout/base/DisplayItemClip.h
layout/base/DisplayItemClip.h
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- TOR_BUG_9701
- changeset 15
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| -1:000000000000 | 0:46a8e8b1943f |
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| 1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef DISPLAYITEMCLIP_H_ | |
| 7 #define DISPLAYITEMCLIP_H_ | |
| 8 | |
| 9 #include "nsRect.h" | |
| 10 #include "nsTArray.h" | |
| 11 #include "nsStyleConsts.h" | |
| 12 | |
| 13 class gfxContext; | |
| 14 class nsDisplayItem; | |
| 15 class nsPresContext; | |
| 16 class nsRegion; | |
| 17 | |
| 18 namespace mozilla { | |
| 19 | |
| 20 /** | |
| 21 * An DisplayItemClip represents the intersection of an optional rectangle | |
| 22 * with a list of rounded rectangles (which is often empty), all in appunits. | |
| 23 * It can represent everything CSS clipping can do to an element (except for | |
| 24 * SVG clip-path), including no clipping at all. | |
| 25 */ | |
| 26 class DisplayItemClip { | |
| 27 public: | |
| 28 struct RoundedRect { | |
| 29 nsRect mRect; | |
| 30 // Indices into mRadii are the NS_CORNER_* constants in nsStyleConsts.h | |
| 31 nscoord mRadii[8]; | |
| 32 | |
| 33 RoundedRect operator+(const nsPoint& aOffset) const { | |
| 34 RoundedRect r = *this; | |
| 35 r.mRect += aOffset; | |
| 36 return r; | |
| 37 } | |
| 38 bool operator==(const RoundedRect& aOther) const { | |
| 39 if (!mRect.IsEqualInterior(aOther.mRect)) { | |
| 40 return false; | |
| 41 } | |
| 42 | |
| 43 NS_FOR_CSS_HALF_CORNERS(corner) { | |
| 44 if (mRadii[corner] != aOther.mRadii[corner]) { | |
| 45 return false; | |
| 46 } | |
| 47 } | |
| 48 return true; | |
| 49 } | |
| 50 bool operator!=(const RoundedRect& aOther) const { | |
| 51 return !(*this == aOther); | |
| 52 } | |
| 53 }; | |
| 54 | |
| 55 // Constructs a DisplayItemClip that does no clipping at all. | |
| 56 DisplayItemClip() : mHaveClipRect(false) {} | |
| 57 | |
| 58 void SetTo(const nsRect& aRect); | |
| 59 void SetTo(const nsRect& aRect, const nscoord* aRadii); | |
| 60 void IntersectWith(const DisplayItemClip& aOther); | |
| 61 | |
| 62 // Apply this |DisplayItemClip| to the given gfxContext. Any saving of state | |
| 63 // or clearing of other clips must be done by the caller. | |
| 64 // See aBegin/aEnd note on ApplyRoundedRectsTo. | |
| 65 void ApplyTo(gfxContext* aContext, nsPresContext* aPresContext, | |
| 66 uint32_t aBegin = 0, uint32_t aEnd = UINT32_MAX); | |
| 67 | |
| 68 void ApplyRectTo(gfxContext* aContext, int32_t A2D) const; | |
| 69 // Applies the rounded rects in this Clip to aContext | |
| 70 // Will only apply rounded rects from aBegin (inclusive) to aEnd | |
| 71 // (exclusive) or the number of rounded rects, whichever is smaller. | |
| 72 void ApplyRoundedRectsTo(gfxContext* aContext, int32_t A2DPRInt32, | |
| 73 uint32_t aBegin, uint32_t aEnd) const; | |
| 74 | |
| 75 // Draw (fill) the rounded rects in this clip to aContext | |
| 76 void DrawRoundedRectsTo(gfxContext* aContext, int32_t A2D, | |
| 77 uint32_t aBegin, uint32_t aEnd) const; | |
| 78 // 'Draw' (create as a path, does not stroke or fill) aRoundRect to aContext | |
| 79 void AddRoundedRectPathTo(gfxContext* aContext, int32_t A2D, | |
| 80 const RoundedRect &aRoundRect) const; | |
| 81 | |
| 82 // Returns true if the intersection of aRect and this clip region is | |
| 83 // non-empty. This is precise for DisplayItemClips with at most one | |
| 84 // rounded rectangle. When multiple rounded rectangles are present, we just | |
| 85 // check that the rectangle intersects all of them (but possibly in different | |
| 86 // places). So it may return true when the correct answer is false. | |
| 87 bool MayIntersect(const nsRect& aRect) const; | |
| 88 // Return a rectangle contained in the intersection of aRect with this | |
| 89 // clip region. Tries to return the largest possible rectangle, but may | |
| 90 // not succeed. | |
| 91 nsRect ApproximateIntersectInward(const nsRect& aRect) const; | |
| 92 | |
| 93 /* | |
| 94 * Computes a region which contains the clipped area of this DisplayItemClip, | |
| 95 * or if aOldClip is non-null, the union of the clipped area of this | |
| 96 * DisplayItemClip with the clipped area of aOldClip translated by aShift. | |
| 97 * The result is stored in aCombined. If the result would be infinite | |
| 98 * (because one or both of the clips does no clipping), returns false. | |
| 99 */ | |
| 100 bool ComputeRegionInClips(DisplayItemClip* aOldClip, | |
| 101 const nsPoint& aShift, | |
| 102 nsRegion* aCombined) const; | |
| 103 | |
| 104 // Returns false if aRect is definitely not clipped by a rounded corner in | |
| 105 // this clip. Returns true if aRect is clipped by a rounded corner in this | |
| 106 // clip or it can not be quickly determined that it is not clipped by a | |
| 107 // rounded corner in this clip. | |
| 108 bool IsRectClippedByRoundedCorner(const nsRect& aRect) const; | |
| 109 | |
| 110 // Returns false if aRect is definitely not clipped by anything in this clip. | |
| 111 // Fast but not necessarily accurate. | |
| 112 bool IsRectAffectedByClip(const nsRect& aRect) const; | |
| 113 | |
| 114 // Intersection of all rects in this clip ignoring any rounded corners. | |
| 115 nsRect NonRoundedIntersection() const; | |
| 116 | |
| 117 // Intersect the given rects with all rects in this clip, ignoring any | |
| 118 // rounded corners. | |
| 119 nsRect ApplyNonRoundedIntersection(const nsRect& aRect) const; | |
| 120 | |
| 121 // Gets rid of any rounded corners in this clip. | |
| 122 void RemoveRoundedCorners(); | |
| 123 | |
| 124 // Adds the difference between Intersect(*this + aPoint, aBounds) and | |
| 125 // Intersect(aOther, aOtherBounds) to aDifference (or a bounding-box thereof). | |
| 126 void AddOffsetAndComputeDifference(const nsPoint& aPoint, const nsRect& aBounds, | |
| 127 const DisplayItemClip& aOther, const nsRect& aOtherBounds, | |
| 128 nsRegion* aDifference); | |
| 129 | |
| 130 bool operator==(const DisplayItemClip& aOther) const { | |
| 131 return mHaveClipRect == aOther.mHaveClipRect && | |
| 132 (!mHaveClipRect || mClipRect.IsEqualInterior(aOther.mClipRect)) && | |
| 133 mRoundedClipRects == aOther.mRoundedClipRects; | |
| 134 } | |
| 135 bool operator!=(const DisplayItemClip& aOther) const { | |
| 136 return !(*this == aOther); | |
| 137 } | |
| 138 | |
| 139 bool HasClip() const { return mHaveClipRect; } | |
| 140 const nsRect& GetClipRect() const | |
| 141 { | |
| 142 NS_ASSERTION(HasClip(), "No clip rect!"); | |
| 143 return mClipRect; | |
| 144 } | |
| 145 | |
| 146 void MoveBy(nsPoint aPoint); | |
| 147 | |
| 148 #ifdef MOZ_DUMP_PAINTING | |
| 149 nsCString ToString() const; | |
| 150 #endif | |
| 151 | |
| 152 /** | |
| 153 * Find the largest N such that the first N rounded rects in 'this' are | |
| 154 * equal to the first N rounded rects in aOther, and N <= aMax. | |
| 155 */ | |
| 156 uint32_t GetCommonRoundedRectCount(const DisplayItemClip& aOther, | |
| 157 uint32_t aMax) const; | |
| 158 uint32_t GetRoundedRectCount() const { return mRoundedClipRects.Length(); } | |
| 159 void AppendRoundedRects(nsTArray<RoundedRect>* aArray, uint32_t aCount) const; | |
| 160 | |
| 161 static const DisplayItemClip& NoClip(); | |
| 162 | |
| 163 static void Shutdown(); | |
| 164 | |
| 165 private: | |
| 166 nsRect mClipRect; | |
| 167 nsTArray<RoundedRect> mRoundedClipRects; | |
| 168 // If mHaveClipRect is false then this object represents no clipping at all | |
| 169 // and mRoundedClipRects must be empty. | |
| 170 bool mHaveClipRect; | |
| 171 }; | |
| 172 | |
| 173 } | |
| 174 | |
| 175 #endif /* DISPLAYITEMCLIP_H_ */ |
