From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- layout/base/DisplayItemClip.h | 191 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 191 insertions(+) create mode 100644 layout/base/DisplayItemClip.h (limited to 'layout/base/DisplayItemClip.h') diff --git a/layout/base/DisplayItemClip.h b/layout/base/DisplayItemClip.h new file mode 100644 index 000000000..9afca38b8 --- /dev/null +++ b/layout/base/DisplayItemClip.h @@ -0,0 +1,191 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef DISPLAYITEMCLIP_H_ +#define DISPLAYITEMCLIP_H_ + +#include "mozilla/RefPtr.h" +#include "nsRect.h" +#include "nsTArray.h" +#include "nsStyleConsts.h" + +class gfxContext; +class nsPresContext; +class nsRegion; + +namespace mozilla { +namespace gfx { +class DrawTarget; +class Path; +} // namespace gfx +} // namespace mozilla + +namespace mozilla { + +/** + * An DisplayItemClip represents the intersection of an optional rectangle + * with a list of rounded rectangles (which is often empty), all in appunits. + * It can represent everything CSS clipping can do to an element (except for + * SVG clip-path), including no clipping at all. + */ +class DisplayItemClip { + typedef mozilla::gfx::Color Color; + typedef mozilla::gfx::DrawTarget DrawTarget; + typedef mozilla::gfx::Path Path; + +public: + struct RoundedRect { + nsRect mRect; + // Indices into mRadii are the NS_CORNER_* constants in nsStyleConsts.h + nscoord mRadii[8]; + + RoundedRect operator+(const nsPoint& aOffset) const { + RoundedRect r = *this; + r.mRect += aOffset; + return r; + } + bool operator==(const RoundedRect& aOther) const { + if (!mRect.IsEqualInterior(aOther.mRect)) { + return false; + } + + NS_FOR_CSS_HALF_CORNERS(corner) { + if (mRadii[corner] != aOther.mRadii[corner]) { + return false; + } + } + return true; + } + bool operator!=(const RoundedRect& aOther) const { + return !(*this == aOther); + } + }; + + // Constructs a DisplayItemClip that does no clipping at all. + DisplayItemClip() : mHaveClipRect(false) {} + + void SetTo(const nsRect& aRect); + void SetTo(const nsRect& aRect, const nscoord* aRadii); + void SetTo(const nsRect& aRect, const nsRect& aRoundedRect, const nscoord* aRadii); + void IntersectWith(const DisplayItemClip& aOther); + + // Apply this |DisplayItemClip| to the given gfxContext. Any saving of state + // or clearing of other clips must be done by the caller. + // See aBegin/aEnd note on ApplyRoundedRectsTo. + void ApplyTo(gfxContext* aContext, nsPresContext* aPresContext, + uint32_t aBegin = 0, uint32_t aEnd = UINT32_MAX); + + void ApplyRectTo(gfxContext* aContext, int32_t A2D) const; + // Applies the rounded rects in this Clip to aContext + // Will only apply rounded rects from aBegin (inclusive) to aEnd + // (exclusive) or the number of rounded rects, whichever is smaller. + void ApplyRoundedRectClipsTo(gfxContext* aContext, int32_t A2DPRInt32, + uint32_t aBegin, uint32_t aEnd) const; + + // Draw (fill) the rounded rects in this clip to aContext + void FillIntersectionOfRoundedRectClips(gfxContext* aContext, + const Color& aColor, + int32_t aAppUnitsPerDevPixel, + uint32_t aBegin, + uint32_t aEnd) const; + // 'Draw' (create as a path, does not stroke or fill) aRoundRect to aContext + already_AddRefed MakeRoundedRectPath(DrawTarget& aDrawTarget, + int32_t A2D, + const RoundedRect &aRoundRect) const; + + // Returns true if the intersection of aRect and this clip region is + // non-empty. This is precise for DisplayItemClips with at most one + // rounded rectangle. When multiple rounded rectangles are present, we just + // check that the rectangle intersects all of them (but possibly in different + // places). So it may return true when the correct answer is false. + bool MayIntersect(const nsRect& aRect) const; + + // Return a rectangle contained in the intersection of aRect with this + // clip region. Tries to return the largest possible rectangle, but may + // not succeed. + nsRect ApproximateIntersectInward(const nsRect& aRect) const; + + /* + * Computes a region which contains the clipped area of this DisplayItemClip, + * or if aOldClip is non-null, the union of the clipped area of this + * DisplayItemClip with the clipped area of aOldClip translated by aShift. + * The result is stored in aCombined. If the result would be infinite + * (because one or both of the clips does no clipping), returns false. + */ + bool ComputeRegionInClips(DisplayItemClip* aOldClip, + const nsPoint& aShift, + nsRegion* aCombined) const; + + // Returns false if aRect is definitely not clipped by a rounded corner in + // this clip. Returns true if aRect is clipped by a rounded corner in this + // clip or it can not be quickly determined that it is not clipped by a + // rounded corner in this clip. + bool IsRectClippedByRoundedCorner(const nsRect& aRect) const; + + // Returns false if aRect is definitely not clipped by anything in this clip. + // Fast but not necessarily accurate. + bool IsRectAffectedByClip(const nsRect& aRect) const; + bool IsRectAffectedByClip(const nsIntRect& aRect, float aXScale, float aYScale, int32_t A2D) const; + + // Intersection of all rects in this clip ignoring any rounded corners. + nsRect NonRoundedIntersection() const; + + // Intersect the given rects with all rects in this clip, ignoring any + // rounded corners. + nsRect ApplyNonRoundedIntersection(const nsRect& aRect) const; + + // Gets rid of any rounded corners in this clip. + void RemoveRoundedCorners(); + + // Adds the difference between Intersect(*this + aPoint, aBounds) and + // Intersect(aOther, aOtherBounds) to aDifference (or a bounding-box thereof). + void AddOffsetAndComputeDifference(uint32_t aStart, const nsPoint& aPoint, const nsRect& aBounds, + const DisplayItemClip& aOther, uint32_t aOtherStart, const nsRect& aOtherBounds, + nsRegion* aDifference); + + bool operator==(const DisplayItemClip& aOther) const { + return mHaveClipRect == aOther.mHaveClipRect && + (!mHaveClipRect || mClipRect.IsEqualInterior(aOther.mClipRect)) && + mRoundedClipRects == aOther.mRoundedClipRects; + } + bool operator!=(const DisplayItemClip& aOther) const { + return !(*this == aOther); + } + + bool HasClip() const { return mHaveClipRect; } + const nsRect& GetClipRect() const + { + NS_ASSERTION(HasClip(), "No clip rect!"); + return mClipRect; + } + + void MoveBy(nsPoint aPoint); + + nsCString ToString() const; + + /** + * Find the largest N such that the first N rounded rects in 'this' are + * equal to the first N rounded rects in aOther, and N <= aMax. + */ + uint32_t GetCommonRoundedRectCount(const DisplayItemClip& aOther, + uint32_t aMax) const; + uint32_t GetRoundedRectCount() const { return mRoundedClipRects.Length(); } + void AppendRoundedRects(nsTArray* aArray, uint32_t aCount) const; + + static const DisplayItemClip& NoClip(); + + static void Shutdown(); + +private: + nsRect mClipRect; + nsTArray mRoundedClipRects; + // If mHaveClipRect is false then this object represents no clipping at all + // and mRoundedClipRects must be empty. + bool mHaveClipRect; +}; + +} // namespace mozilla + +#endif /* DISPLAYITEMCLIP_H_ */ -- cgit v1.2.3