2011-10-28 07:05:31 +00:00
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/*
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* Copyright 2005 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkRegion_DEFINED
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#define SkRegion_DEFINED
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#include "SkRect.h"
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class SkPath;
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class SkRgnBuilder;
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namespace android {
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class Region;
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}
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#define SkRegion_gEmptyRunHeadPtr ((SkRegion::RunHead*)-1)
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#define SkRegion_gRectRunHeadPtr 0
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/** \class SkRegion
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The SkRegion class encapsulates the geometric region used to specify
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clipping areas for drawing.
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*/
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class SK_API SkRegion {
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public:
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typedef int32_t RunType;
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enum {
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kRunTypeSentinel = 0x7FFFFFFF
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};
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SkRegion();
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SkRegion(const SkRegion&);
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explicit SkRegion(const SkIRect&);
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~SkRegion();
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SkRegion& operator=(const SkRegion&);
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/**
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* Return true if the two regions are equal. i.e. The enclose exactly
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* the same area.
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*/
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friend bool operator==(const SkRegion& a, const SkRegion& b);
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/**
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* Return true if the two regions are not equal.
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*/
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friend bool operator!=(const SkRegion& a, const SkRegion& b) {
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return !(a == b);
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}
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/**
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* Replace this region with the specified region, and return true if the
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* resulting region is non-empty.
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*/
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bool set(const SkRegion& src) {
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SkASSERT(&src);
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*this = src;
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return !this->isEmpty();
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}
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/**
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* Swap the contents of this and the specified region. This operation
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* is gauarenteed to never fail.
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*/
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void swap(SkRegion&);
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/** Return true if this region is empty */
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bool isEmpty() const { return fRunHead == SkRegion_gEmptyRunHeadPtr; }
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/** Return true if this region is a single, non-empty rectangle */
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bool isRect() const { return fRunHead == SkRegion_gRectRunHeadPtr; }
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/** Return true if this region consists of more than 1 rectangular area */
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bool isComplex() const { return !this->isEmpty() && !this->isRect(); }
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/**
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* Return the bounds of this region. If the region is empty, returns an
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* empty rectangle.
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*/
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const SkIRect& getBounds() const { return fBounds; }
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/**
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* Returns true if the region is non-empty, and if so, appends the
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* boundary(s) of the region to the specified path.
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* If the region is empty, returns false, and path is left unmodified.
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2011-10-28 07:05:31 +00:00
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*/
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bool getBoundaryPath(SkPath* path) const;
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/**
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* Set the region to be empty, and return false, since the resulting
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* region is empty
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*/
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bool setEmpty();
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/**
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* If rect is non-empty, set this region to that rectangle and return true,
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* otherwise set this region to empty and return false.
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*/
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bool setRect(const SkIRect&);
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/**
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* If left < right and top < bottom, set this region to that rectangle and
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* return true, otherwise set this region to empty and return false.
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*/
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bool setRect(int32_t left, int32_t top, int32_t right, int32_t bottom);
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/**
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* Set this region to the union of an array of rects. This is generally
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* faster than calling region.op(rect, kUnion_Op) in a loop. If count is
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* 0, then this region is set to the empty region.
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* @return true if the resulting region is non-empty
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*/
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bool setRects(const SkIRect rects[], int count);
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/**
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* Set this region to the specified region, and return true if it is
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* non-empty.
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*/
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bool setRegion(const SkRegion&);
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/**
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* Set this region to the area described by the path, clipped.
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* Return true if the resulting region is non-empty.
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* This produces a region that is identical to the pixels that would be
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* drawn by the path (with no antialiasing) with the specified clip.
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*/
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bool setPath(const SkPath&, const SkRegion& clip);
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/**
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* Returns true if the specified rectangle has a non-empty intersection
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* with this region.
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*/
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bool intersects(const SkIRect&) const;
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/**
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* Returns true if the specified region has a non-empty intersection
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* with this region.
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*/
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bool intersects(const SkRegion&) const;
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/**
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* Return true if the specified x,y coordinate is inside the region.
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*/
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bool contains(int32_t x, int32_t y) const;
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/**
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* Return true if the specified rectangle is completely inside the region.
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* This works for simple (rectangular) and complex regions, and always
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* returns the correct result. Note: if either this region or the rectangle
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* is empty, contains() returns false.
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*/
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bool contains(const SkIRect&) const;
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/**
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* Return true if the specified region is completely inside the region.
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* This works for simple (rectangular) and complex regions, and always
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* returns the correct result. Note: if either region is empty, contains()
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* returns false.
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*/
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bool contains(const SkRegion&) const;
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/**
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* Return true if this region is a single rectangle (not complex) and the
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* specified rectangle is contained by this region. Returning false is not
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* a guarantee that the rectangle is not contained by this region, but
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* return true is a guarantee that the rectangle is contained by this region.
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*/
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bool quickContains(const SkIRect& r) const {
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return this->quickContains(r.fLeft, r.fTop, r.fRight, r.fBottom);
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}
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/**
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* Return true if this region is a single rectangle (not complex) and the
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* specified rectangle is contained by this region. Returning false is not
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* a guarantee that the rectangle is not contained by this region, but
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* return true is a guarantee that the rectangle is contained by this
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* region.
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*/
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bool quickContains(int32_t left, int32_t top, int32_t right,
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int32_t bottom) const {
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SkASSERT(this->isEmpty() == fBounds.isEmpty()); // valid region
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return left < right && top < bottom &&
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fRunHead == SkRegion_gRectRunHeadPtr && // this->isRect()
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/* fBounds.contains(left, top, right, bottom); */
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fBounds.fLeft <= left && fBounds.fTop <= top &&
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fBounds.fRight >= right && fBounds.fBottom >= bottom;
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}
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/**
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* Return true if this region is empty, or if the specified rectangle does
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* not intersect the region. Returning false is not a guarantee that they
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* intersect, but returning true is a guarantee that they do not.
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*/
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bool quickReject(const SkIRect& rect) const {
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return this->isEmpty() || rect.isEmpty() ||
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!SkIRect::Intersects(fBounds, rect);
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}
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/**
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* Return true if this region, or rgn, is empty, or if their bounds do not
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* intersect. Returning false is not a guarantee that they intersect, but
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* returning true is a guarantee that they do not.
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*/
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bool quickReject(const SkRegion& rgn) const {
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return this->isEmpty() || rgn.isEmpty() ||
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!SkIRect::Intersects(fBounds, rgn.fBounds);
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}
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/** Translate the region by the specified (dx, dy) amount. */
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void translate(int dx, int dy) { this->translate(dx, dy, this); }
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/**
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* Translate the region by the specified (dx, dy) amount, writing the
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* resulting region into dst. Note: it is legal to pass this region as the
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* dst parameter, effectively translating the region in place. If dst is
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* null, nothing happens.
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*/
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void translate(int dx, int dy, SkRegion* dst) const;
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/**
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* The logical operations that can be performed when combining two regions.
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*/
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enum Op {
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kDifference_Op, //!< subtract the op region from the first region
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kIntersect_Op, //!< intersect the two regions
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kUnion_Op, //!< union (inclusive-or) the two regions
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kXOR_Op, //!< exclusive-or the two regions
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/** subtract the first region from the op region */
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kReverseDifference_Op,
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kReplace_Op //!< replace the dst region with the op region
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};
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/**
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* Set this region to the result of applying the Op to this region and the
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* specified rectangle: this = (this op rect).
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* Return true if the resulting region is non-empty.
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*/
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bool op(const SkIRect& rect, Op op) { return this->op(*this, rect, op); }
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/**
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* Set this region to the result of applying the Op to this region and the
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* specified rectangle: this = (this op rect).
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* Return true if the resulting region is non-empty.
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*/
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bool op(int left, int top, int right, int bottom, Op op) {
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SkIRect rect;
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rect.set(left, top, right, bottom);
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return this->op(*this, rect, op);
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}
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/**
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* Set this region to the result of applying the Op to this region and the
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* specified region: this = (this op rgn).
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* Return true if the resulting region is non-empty.
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*/
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bool op(const SkRegion& rgn, Op op) { return this->op(*this, rgn, op); }
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/**
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* Set this region to the result of applying the Op to the specified
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* rectangle and region: this = (rect op rgn).
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* Return true if the resulting region is non-empty.
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*/
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bool op(const SkIRect& rect, const SkRegion& rgn, Op);
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/**
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* Set this region to the result of applying the Op to the specified
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* region and rectangle: this = (rgn op rect).
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* Return true if the resulting region is non-empty.
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*/
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bool op(const SkRegion& rgn, const SkIRect& rect, Op);
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/**
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* Set this region to the result of applying the Op to the specified
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* regions: this = (rgna op rgnb).
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* Return true if the resulting region is non-empty.
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*/
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bool op(const SkRegion& rgna, const SkRegion& rgnb, Op op);
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2012-01-19 04:48:34 +00:00
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#ifdef SK_BUILD_FOR_ANDROID
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2011-10-28 07:05:31 +00:00
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/** Returns a new char* containing the list of rectangles in this region
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*/
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char* toString();
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#endif
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/**
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* Returns the sequence of rectangles, sorted in Y and X, that make up
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* this region.
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*/
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class SK_API Iterator {
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public:
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Iterator() : fRgn(NULL), fDone(true) {}
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Iterator(const SkRegion&);
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// if we have a region, reset to it and return true, else return false
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bool rewind();
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// reset the iterator, using the new region
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void reset(const SkRegion&);
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bool done() const { return fDone; }
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void next();
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const SkIRect& rect() const { return fRect; }
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// may return null
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const SkRegion* rgn() const { return fRgn; }
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private:
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const SkRegion* fRgn;
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const RunType* fRuns;
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SkIRect fRect;
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bool fDone;
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};
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/**
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* Returns the sequence of rectangles, sorted in Y and X, that make up
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* this region intersected with the specified clip rectangle.
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*/
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class SK_API Cliperator {
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public:
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Cliperator(const SkRegion&, const SkIRect& clip);
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bool done() { return fDone; }
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void next();
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const SkIRect& rect() const { return fRect; }
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private:
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Iterator fIter;
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SkIRect fClip;
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SkIRect fRect;
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bool fDone;
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};
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/**
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* Returns the sequence of runs that make up this region for the specified
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* Y scanline, clipped to the specified left and right X values.
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*/
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class Spanerator {
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public:
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Spanerator(const SkRegion&, int y, int left, int right);
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bool next(int* left, int* right);
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private:
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const SkRegion::RunType* fRuns;
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int fLeft, fRight;
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bool fDone;
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};
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/**
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* Write the region to the buffer, and return the number of bytes written.
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* If buffer is NULL, it still returns the number of bytes.
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*/
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uint32_t flatten(void* buffer) const;
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/**
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* Initialized the region from the buffer, returning the number
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* of bytes actually read.
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*/
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uint32_t unflatten(const void* buffer);
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/**
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* Returns a reference to a global empty region. Just a convenience for
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* callers that need a const empty region.
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*/
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static const SkRegion& GetEmptyRegion();
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SkDEBUGCODE(void dump() const;)
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SkDEBUGCODE(void validate() const;)
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SkDEBUGCODE(static void UnitTest();)
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// expose this to allow for regression test on complex regions
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SkDEBUGCODE(bool debugSetRuns(const RunType runs[], int count);)
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private:
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enum {
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kOpCount = kReplace_Op + 1
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};
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enum {
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kRectRegionRuns = 6 // need to store a region of a rect [T B L R S S]
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};
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friend class android::Region; // needed for marshalling efficiently
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void allocateRuns(int count); // allocate space for count runs
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struct RunHead;
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SkIRect fBounds;
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RunHead* fRunHead;
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void freeRuns();
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const RunType* getRuns(RunType tmpStorage[], int* count) const;
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bool setRuns(RunType runs[], int count);
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int count_runtype_values(int* itop, int* ibot) const;
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static void BuildRectRuns(const SkIRect& bounds,
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RunType runs[kRectRegionRuns]);
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// returns true if runs are just a rect
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static bool ComputeRunBounds(const RunType runs[], int count,
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SkIRect* bounds);
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friend struct RunHead;
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friend class Iterator;
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friend class Spanerator;
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friend class SkRgnBuilder;
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friend class SkFlatRegion;
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};
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#endif
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