1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkRasterClip.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,163 @@
1.4 +/*
1.5 + * Copyright 2010 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkRasterClip_DEFINED
1.12 +#define SkRasterClip_DEFINED
1.13 +
1.14 +#include "SkRegion.h"
1.15 +#include "SkAAClip.h"
1.16 +
1.17 +class SkRasterClip {
1.18 +public:
1.19 + SkRasterClip();
1.20 + SkRasterClip(const SkIRect&);
1.21 + SkRasterClip(const SkRasterClip&);
1.22 + ~SkRasterClip();
1.23 +
1.24 + bool isBW() const { return fIsBW; }
1.25 + bool isAA() const { return !fIsBW; }
1.26 + const SkRegion& bwRgn() const { SkASSERT(fIsBW); return fBW; }
1.27 + const SkAAClip& aaRgn() const { SkASSERT(!fIsBW); return fAA; }
1.28 +
1.29 + bool isEmpty() const {
1.30 + SkASSERT(this->computeIsEmpty() == fIsEmpty);
1.31 + return fIsEmpty;
1.32 + }
1.33 +
1.34 + bool isRect() const {
1.35 + SkASSERT(this->computeIsRect() == fIsRect);
1.36 + return fIsRect;
1.37 + }
1.38 +
1.39 + bool isComplex() const;
1.40 + const SkIRect& getBounds() const;
1.41 +
1.42 + bool setEmpty();
1.43 + bool setRect(const SkIRect&);
1.44 +
1.45 + bool setPath(const SkPath& path, const SkRegion& clip, bool doAA);
1.46 + bool setPath(const SkPath& path, const SkIRect& clip, bool doAA);
1.47 +
1.48 + bool op(const SkIRect&, SkRegion::Op);
1.49 + bool op(const SkRegion&, SkRegion::Op);
1.50 + bool op(const SkRasterClip&, SkRegion::Op);
1.51 + bool op(const SkRect&, SkRegion::Op, bool doAA);
1.52 +
1.53 + void translate(int dx, int dy, SkRasterClip* dst) const;
1.54 + void translate(int dx, int dy) {
1.55 + this->translate(dx, dy, this);
1.56 + }
1.57 +
1.58 + bool quickContains(const SkIRect& rect) const;
1.59 + bool quickContains(int left, int top, int right, int bottom) const {
1.60 + return quickContains(SkIRect::MakeLTRB(left, top, right, bottom));
1.61 + }
1.62 +
1.63 + /**
1.64 + * Return true if this region is empty, or if the specified rectangle does
1.65 + * not intersect the region. Returning false is not a guarantee that they
1.66 + * intersect, but returning true is a guarantee that they do not.
1.67 + */
1.68 + bool quickReject(const SkIRect& rect) const {
1.69 + return this->isEmpty() || rect.isEmpty() ||
1.70 + !SkIRect::Intersects(this->getBounds(), rect);
1.71 + }
1.72 +
1.73 + // hack for SkCanvas::getTotalClip
1.74 + const SkRegion& forceGetBW();
1.75 +
1.76 +#ifdef SK_DEBUG
1.77 + void validate() const;
1.78 +#else
1.79 + void validate() const {}
1.80 +#endif
1.81 +
1.82 +private:
1.83 + SkRegion fBW;
1.84 + SkAAClip fAA;
1.85 + bool fIsBW;
1.86 + // these 2 are caches based on querying the right obj based on fIsBW
1.87 + bool fIsEmpty;
1.88 + bool fIsRect;
1.89 +
1.90 + bool computeIsEmpty() const {
1.91 + return fIsBW ? fBW.isEmpty() : fAA.isEmpty();
1.92 + }
1.93 +
1.94 + bool computeIsRect() const {
1.95 + return fIsBW ? fBW.isRect() : false;
1.96 + }
1.97 +
1.98 + bool updateCacheAndReturnNonEmpty() {
1.99 + fIsEmpty = this->computeIsEmpty();
1.100 + fIsRect = this->computeIsRect();
1.101 + return !fIsEmpty;
1.102 + }
1.103 +
1.104 + void convertToAA();
1.105 +};
1.106 +
1.107 +class SkAutoRasterClipValidate : SkNoncopyable {
1.108 +public:
1.109 + SkAutoRasterClipValidate(const SkRasterClip& rc) : fRC(rc) {
1.110 + fRC.validate();
1.111 + }
1.112 + ~SkAutoRasterClipValidate() {
1.113 + fRC.validate();
1.114 + }
1.115 +private:
1.116 + const SkRasterClip& fRC;
1.117 +};
1.118 +#define SkAutoRasterClipValidate(...) SK_REQUIRE_LOCAL_VAR(SkAutoRasterClipValidate)
1.119 +
1.120 +#ifdef SK_DEBUG
1.121 + #define AUTO_RASTERCLIP_VALIDATE(rc) SkAutoRasterClipValidate arcv(rc)
1.122 +#else
1.123 + #define AUTO_RASTERCLIP_VALIDATE(rc)
1.124 +#endif
1.125 +
1.126 +///////////////////////////////////////////////////////////////////////////////
1.127 +
1.128 +/**
1.129 + * Encapsulates the logic of deciding if we need to change/wrap the blitter
1.130 + * for aaclipping. If so, getRgn and getBlitter return modified values. If
1.131 + * not, they return the raw blitter and (bw) clip region.
1.132 + *
1.133 + * We need to keep the constructor/destructor cost as small as possible, so we
1.134 + * can freely put this guy on the stack, and not pay too much for the case when
1.135 + * we're really BW anyways.
1.136 + */
1.137 +class SkAAClipBlitterWrapper {
1.138 +public:
1.139 + SkAAClipBlitterWrapper();
1.140 + SkAAClipBlitterWrapper(const SkRasterClip&, SkBlitter*);
1.141 + SkAAClipBlitterWrapper(const SkAAClip*, SkBlitter*);
1.142 +
1.143 + void init(const SkRasterClip&, SkBlitter*);
1.144 +
1.145 + const SkIRect& getBounds() const {
1.146 + SkASSERT(fClipRgn);
1.147 + return fClipRgn->getBounds();
1.148 + }
1.149 + const SkRegion& getRgn() const {
1.150 + SkASSERT(fClipRgn);
1.151 + return *fClipRgn;
1.152 + }
1.153 + SkBlitter* getBlitter() {
1.154 + SkASSERT(fBlitter);
1.155 + return fBlitter;
1.156 + }
1.157 +
1.158 +private:
1.159 + SkRegion fBWRgn;
1.160 + SkAAClipBlitter fAABlitter;
1.161 + // what we return
1.162 + const SkRegion* fClipRgn;
1.163 + SkBlitter* fBlitter;
1.164 +};
1.165 +
1.166 +#endif
