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673 lines
23 KiB
673 lines
23 KiB
/*
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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 "include/core/SkRect.h"
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class SkPath;
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class SkRgnBuilder;
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/** \class SkRegion
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SkRegion describes the set of pixels used to clip SkCanvas. SkRegion is compact,
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efficiently storing a single integer rectangle, or a run length encoded array
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of rectangles. SkRegion may reduce the current SkCanvas clip, or may be drawn as
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one or more integer rectangles. SkRegion iterator returns the scan lines or
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rectangles contained by it, optionally intersecting a bounding rectangle.
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*/
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class SK_API SkRegion {
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typedef int32_t RunType;
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public:
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/** Constructs an empty SkRegion. SkRegion is set to empty bounds
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at (0, 0) with zero width and height.
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@return empty SkRegion
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example: https://fiddle.skia.org/c/@Region_empty_constructor
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*/
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SkRegion();
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/** Constructs a copy of an existing region.
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Copy constructor makes two regions identical by value. Internally, region and
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the returned result share pointer values. The underlying SkRect array is
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copied when modified.
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Creating a SkRegion copy is very efficient and never allocates memory.
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SkRegion are always copied by value from the interface; the underlying shared
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pointers are not exposed.
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@param region SkRegion to copy by value
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@return copy of SkRegion
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example: https://fiddle.skia.org/c/@Region_copy_const_SkRegion
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*/
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SkRegion(const SkRegion& region);
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/** Constructs a rectangular SkRegion matching the bounds of rect.
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@param rect bounds of constructed SkRegion
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@return rectangular SkRegion
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example: https://fiddle.skia.org/c/@Region_copy_const_SkIRect
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*/
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explicit SkRegion(const SkIRect& rect);
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/** Releases ownership of any shared data and deletes data if SkRegion is sole owner.
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example: https://fiddle.skia.org/c/@Region_destructor
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*/
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~SkRegion();
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/** Constructs a copy of an existing region.
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Makes two regions identical by value. Internally, region and
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the returned result share pointer values. The underlying SkRect array is
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copied when modified.
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Creating a SkRegion copy is very efficient and never allocates memory.
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SkRegion are always copied by value from the interface; the underlying shared
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pointers are not exposed.
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@param region SkRegion to copy by value
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@return SkRegion to copy by value
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example: https://fiddle.skia.org/c/@Region_copy_operator
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*/
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SkRegion& operator=(const SkRegion& region);
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/** Compares SkRegion and other; returns true if they enclose exactly
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the same area.
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@param other SkRegion to compare
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@return true if SkRegion pair are equivalent
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example: https://fiddle.skia.org/c/@Region_equal1_operator
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*/
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bool operator==(const SkRegion& other) const;
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/** Compares SkRegion and other; returns true if they do not enclose the same area.
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@param other SkRegion to compare
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@return true if SkRegion pair are not equivalent
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*/
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bool operator!=(const SkRegion& other) const {
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return !(*this == other);
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}
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/** Sets SkRegion to src, and returns true if src bounds is not empty.
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This makes SkRegion and src identical by value. Internally,
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SkRegion and src share pointer values. The underlying SkRect array is
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copied when modified.
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Creating a SkRegion copy is very efficient and never allocates memory.
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SkRegion are always copied by value from the interface; the underlying shared
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pointers are not exposed.
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@param src SkRegion to copy
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@return copy of src
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*/
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bool set(const SkRegion& src) {
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*this = src;
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return !this->isEmpty();
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}
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/** Exchanges SkIRect array of SkRegion and other. swap() internally exchanges pointers,
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so it is lightweight and does not allocate memory.
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swap() usage has largely been replaced by operator=(const SkRegion& region).
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SkPath do not copy their content on assignment until they are written to,
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making assignment as efficient as swap().
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@param other operator=(const SkRegion& region) set
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example: https://fiddle.skia.org/c/@Region_swap
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*/
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void swap(SkRegion& other);
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/** Returns true if SkRegion is empty.
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Empty SkRegion has bounds width or height less than or equal to zero.
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SkRegion() constructs empty SkRegion; setEmpty()
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and setRect() with dimensionless data make SkRegion empty.
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@return true if bounds has no width or height
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*/
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bool isEmpty() const { return fRunHead == emptyRunHeadPtr(); }
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/** Returns true if SkRegion is one SkIRect with positive dimensions.
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@return true if SkRegion contains one SkIRect
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*/
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bool isRect() const { return fRunHead == kRectRunHeadPtr; }
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/** Returns true if SkRegion is described by more than one rectangle.
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@return true if SkRegion contains more than one SkIRect
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*/
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bool isComplex() const { return !this->isEmpty() && !this->isRect(); }
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/** Returns minimum and maximum axes values of SkIRect array.
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Returns (0, 0, 0, 0) if SkRegion is empty.
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@return combined bounds of all SkIRect elements
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*/
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const SkIRect& getBounds() const { return fBounds; }
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/** Returns a value that increases with the number of
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elements in SkRegion. Returns zero if SkRegion is empty.
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Returns one if SkRegion equals SkIRect; otherwise, returns
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value greater than one indicating that SkRegion is complex.
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Call to compare SkRegion for relative complexity.
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@return relative complexity
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example: https://fiddle.skia.org/c/@Region_computeRegionComplexity
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*/
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int computeRegionComplexity() const;
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/** Appends outline of SkRegion to path.
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Returns true if SkRegion is not empty; otherwise, returns false, and leaves path
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unmodified.
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@param path SkPath to append to
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@return true if path changed
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example: https://fiddle.skia.org/c/@Region_getBoundaryPath
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*/
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bool getBoundaryPath(SkPath* path) const;
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/** Constructs an empty SkRegion. SkRegion is set to empty bounds
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at (0, 0) with zero width and height. Always returns false.
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@return false
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example: https://fiddle.skia.org/c/@Region_setEmpty
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*/
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bool setEmpty();
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/** Constructs a rectangular SkRegion matching the bounds of rect.
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If rect is empty, constructs empty and returns false.
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@param rect bounds of constructed SkRegion
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@return true if rect is not empty
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example: https://fiddle.skia.org/c/@Region_setRect
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*/
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bool setRect(const SkIRect& rect);
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/** Constructs SkRegion as the union of SkIRect in rects array. If count is
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zero, constructs empty SkRegion. Returns false if constructed SkRegion is empty.
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May be faster than repeated calls to op().
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@param rects array of SkIRect
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@param count array size
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@return true if constructed SkRegion is not empty
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example: https://fiddle.skia.org/c/@Region_setRects
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*/
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bool setRects(const SkIRect rects[], int count);
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/** Constructs a copy of an existing region.
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Makes two regions identical by value. Internally, region and
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the returned result share pointer values. The underlying SkRect array is
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copied when modified.
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Creating a SkRegion copy is very efficient and never allocates memory.
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SkRegion are always copied by value from the interface; the underlying shared
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pointers are not exposed.
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@param region SkRegion to copy by value
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@return SkRegion to copy by value
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example: https://fiddle.skia.org/c/@Region_setRegion
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*/
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bool setRegion(const SkRegion& region);
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/** Constructs SkRegion to match outline of path within clip.
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Returns false if constructed SkRegion is empty.
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Constructed SkRegion draws the same pixels as path through clip when
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anti-aliasing is disabled.
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@param path SkPath providing outline
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@param clip SkRegion containing path
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@return true if constructed SkRegion is not empty
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example: https://fiddle.skia.org/c/@Region_setPath
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*/
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bool setPath(const SkPath& path, const SkRegion& clip);
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/** Returns true if SkRegion intersects rect.
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Returns false if either rect or SkRegion is empty, or do not intersect.
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@param rect SkIRect to intersect
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@return true if rect and SkRegion have area in common
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example: https://fiddle.skia.org/c/@Region_intersects
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*/
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bool intersects(const SkIRect& rect) const;
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/** Returns true if SkRegion intersects other.
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Returns false if either other or SkRegion is empty, or do not intersect.
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@param other SkRegion to intersect
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@return true if other and SkRegion have area in common
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example: https://fiddle.skia.org/c/@Region_intersects_2
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*/
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bool intersects(const SkRegion& other) const;
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/** Returns true if SkIPoint (x, y) is inside SkRegion.
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Returns false if SkRegion is empty.
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@param x test SkIPoint x-coordinate
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@param y test SkIPoint y-coordinate
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@return true if (x, y) is inside SkRegion
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example: https://fiddle.skia.org/c/@Region_contains
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*/
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bool contains(int32_t x, int32_t y) const;
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/** Returns true if other is completely inside SkRegion.
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Returns false if SkRegion or other is empty.
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@param other SkIRect to contain
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@return true if other is inside SkRegion
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example: https://fiddle.skia.org/c/@Region_contains_2
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*/
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bool contains(const SkIRect& other) const;
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/** Returns true if other is completely inside SkRegion.
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Returns false if SkRegion or other is empty.
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@param other SkRegion to contain
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@return true if other is inside SkRegion
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example: https://fiddle.skia.org/c/@Region_contains_3
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*/
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bool contains(const SkRegion& other) const;
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/** Returns true if SkRegion is a single rectangle and contains r.
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May return false even though SkRegion contains r.
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@param r SkIRect to contain
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@return true quickly if r points are equal or inside
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*/
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bool quickContains(const SkIRect& r) const {
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SkASSERT(this->isEmpty() == fBounds.isEmpty()); // valid region
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return r.fLeft < r.fRight && r.fTop < r.fBottom &&
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fRunHead == kRectRunHeadPtr && // this->isRect()
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/* fBounds.contains(left, top, right, bottom); */
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fBounds.fLeft <= r.fLeft && fBounds.fTop <= r.fTop &&
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fBounds.fRight >= r.fRight && fBounds.fBottom >= r.fBottom;
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}
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/** Returns true if SkRegion does not intersect rect.
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Returns true if rect is empty or SkRegion is empty.
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May return false even though SkRegion does not intersect rect.
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@param rect SkIRect to intersect
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@return true if rect does not intersect
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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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/** Returns true if SkRegion does not intersect rgn.
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Returns true if rgn is empty or SkRegion is empty.
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May return false even though SkRegion does not intersect rgn.
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@param rgn SkRegion to intersect
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@return true if rgn does not intersect
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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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/** Offsets SkRegion by ivector (dx, dy). Has no effect if SkRegion is empty.
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@param dx x-axis offset
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@param dy y-axis offset
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*/
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void translate(int dx, int dy) { this->translate(dx, dy, this); }
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/** Offsets SkRegion by ivector (dx, dy), writing result to dst. SkRegion may be passed
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as dst parameter, translating SkRegion in place. Has no effect if dst is nullptr.
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If SkRegion is empty, sets dst to empty.
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@param dx x-axis offset
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@param dy y-axis offset
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@param dst translated result
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example: https://fiddle.skia.org/c/@Region_translate_2
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*/
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void translate(int dx, int dy, SkRegion* dst) const;
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/** \enum SkRegion::Op
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The logical operations that can be performed when combining two SkRegion.
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*/
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enum Op {
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kDifference_Op, //!< target minus operand
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kIntersect_Op, //!< target intersected with operand
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kUnion_Op, //!< target unioned with operand
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kXOR_Op, //!< target exclusive or with operand
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kReverseDifference_Op, //!< operand minus target
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kReplace_Op, //!< replace target with operand
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kLastOp = kReplace_Op, //!< last operator
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};
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static const int kOpCnt = kLastOp + 1;
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/** Replaces SkRegion with the result of SkRegion op rect.
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Returns true if replaced SkRegion is not empty.
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@param rect SkIRect operand
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@return false if result is empty
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*/
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bool op(const SkIRect& rect, Op op) {
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if (this->isRect() && kIntersect_Op == op) {
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if (!fBounds.intersect(rect)) {
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return this->setEmpty();
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}
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return true;
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}
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return this->op(*this, rect, op);
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}
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/** Replaces SkRegion with the result of SkRegion op rgn.
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Returns true if replaced SkRegion is not empty.
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@param rgn SkRegion operand
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@return false if result is 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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/** Replaces SkRegion with the result of rect op rgn.
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Returns true if replaced SkRegion is not empty.
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@param rect SkIRect operand
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@param rgn SkRegion operand
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@return false if result is empty
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example: https://fiddle.skia.org/c/@Region_op_4
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*/
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bool op(const SkIRect& rect, const SkRegion& rgn, Op op);
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/** Replaces SkRegion with the result of rgn op rect.
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Returns true if replaced SkRegion is not empty.
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@param rgn SkRegion operand
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@param rect SkIRect operand
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@return false if result is empty
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example: https://fiddle.skia.org/c/@Region_op_5
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*/
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bool op(const SkRegion& rgn, const SkIRect& rect, Op op);
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/** Replaces SkRegion with the result of rgna op rgnb.
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Returns true if replaced SkRegion is not empty.
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@param rgna SkRegion operand
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@param rgnb SkRegion operand
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@return false if result is empty
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example: https://fiddle.skia.org/c/@Region_op_6
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*/
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bool op(const SkRegion& rgna, const SkRegion& rgnb, Op op);
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#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
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/** Private. Android framework only.
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@return string representation of SkRegion
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*/
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char* toString();
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#endif
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/** \class SkRegion::Iterator
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Returns sequence of rectangles, sorted along y-axis, then x-axis, that make
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up SkRegion.
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*/
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class SK_API Iterator {
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public:
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/** Initializes SkRegion::Iterator with an empty SkRegion. done() on SkRegion::Iterator
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returns true.
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Call reset() to initialized SkRegion::Iterator at a later time.
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@return empty SkRegion iterator
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*/
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Iterator() : fRgn(nullptr), fDone(true) {}
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/** Sets SkRegion::Iterator to return elements of SkIRect array in region.
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@param region SkRegion to iterate
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@return SkRegion iterator
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example: https://fiddle.skia.org/c/@Region_Iterator_copy_const_SkRegion
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*/
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Iterator(const SkRegion& region);
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/** SkPoint SkRegion::Iterator to start of SkRegion.
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Returns true if SkRegion was set; otherwise, returns false.
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@return true if SkRegion was set
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example: https://fiddle.skia.org/c/@Region_Iterator_rewind
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*/
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bool rewind();
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/** Resets iterator, using the new SkRegion.
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@param region SkRegion to iterate
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example: https://fiddle.skia.org/c/@Region_Iterator_reset
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*/
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void reset(const SkRegion& region);
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/** Returns true if SkRegion::Iterator is pointing to final SkIRect in SkRegion.
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@return true if data parsing is complete
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*/
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bool done() const { return fDone; }
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/** Advances SkRegion::Iterator to next SkIRect in SkRegion if it is not done.
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example: https://fiddle.skia.org/c/@Region_Iterator_next
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*/
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void next();
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/** Returns SkIRect element in SkRegion. Does not return predictable results if SkRegion
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is empty.
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@return part of SkRegion as SkIRect
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*/
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const SkIRect& rect() const { return fRect; }
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/** Returns SkRegion if set; otherwise, returns nullptr.
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@return iterated SkRegion
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*/
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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 SkRegion::RunType* fRuns;
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SkIRect fRect = {0, 0, 0, 0};
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bool fDone;
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};
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/** \class SkRegion::Cliperator
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Returns the sequence of rectangles, sorted along y-axis, then x-axis, that make
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up SkRegion 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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/** Sets SkRegion::Cliperator to return elements of SkIRect array in SkRegion within clip.
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@param region SkRegion to iterate
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@param clip bounds of iteration
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@return SkRegion iterator
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example: https://fiddle.skia.org/c/@Region_Cliperator_const_SkRegion_const_SkIRect
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*/
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Cliperator(const SkRegion& region, const SkIRect& clip);
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/** Returns true if SkRegion::Cliperator is pointing to final SkIRect in SkRegion.
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@return true if data parsing is complete
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*/
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bool done() { return fDone; }
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/** Advances iterator to next SkIRect in SkRegion contained by clip.
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example: https://fiddle.skia.org/c/@Region_Cliperator_next
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*/
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void next();
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/** Returns SkIRect element in SkRegion, intersected with clip passed to
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SkRegion::Cliperator constructor. Does not return predictable results if SkRegion
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is empty.
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@return part of SkRegion inside clip as SkIRect
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*/
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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 = {0, 0, 0, 0};
|
|
bool fDone;
|
|
};
|
|
|
|
/** \class SkRegion::Spanerator
|
|
Returns the line segment ends within SkRegion that intersect a horizontal line.
|
|
*/
|
|
class Spanerator {
|
|
public:
|
|
|
|
/** Sets SkRegion::Spanerator to return line segments in SkRegion on scan line.
|
|
|
|
@param region SkRegion to iterate
|
|
@param y horizontal line to intersect
|
|
@param left bounds of iteration
|
|
@param right bounds of iteration
|
|
@return SkRegion iterator
|
|
|
|
example: https://fiddle.skia.org/c/@Region_Spanerator_const_SkRegion_int_int_int
|
|
*/
|
|
Spanerator(const SkRegion& region, int y, int left, int right);
|
|
|
|
/** Advances iterator to next span intersecting SkRegion within line segment provided
|
|
in constructor. Returns true if interval was found.
|
|
|
|
@param left pointer to span start; may be nullptr
|
|
@param right pointer to span end; may be nullptr
|
|
@return true if interval was found
|
|
|
|
example: https://fiddle.skia.org/c/@Region_Spanerator_next
|
|
*/
|
|
bool next(int* left, int* right);
|
|
|
|
private:
|
|
const SkRegion::RunType* fRuns;
|
|
int fLeft, fRight;
|
|
bool fDone;
|
|
};
|
|
|
|
/** Writes SkRegion to buffer, and returns number of bytes written.
|
|
If buffer is nullptr, returns number number of bytes that would be written.
|
|
|
|
@param buffer storage for binary data
|
|
@return size of SkRegion
|
|
|
|
example: https://fiddle.skia.org/c/@Region_writeToMemory
|
|
*/
|
|
size_t writeToMemory(void* buffer) const;
|
|
|
|
/** Constructs SkRegion from buffer of size length. Returns bytes read.
|
|
Returned value will be multiple of four or zero if length was too small.
|
|
|
|
@param buffer storage for binary data
|
|
@param length size of buffer
|
|
@return bytes read
|
|
|
|
example: https://fiddle.skia.org/c/@Region_readFromMemory
|
|
*/
|
|
size_t readFromMemory(const void* buffer, size_t length);
|
|
|
|
private:
|
|
static constexpr int kOpCount = kReplace_Op + 1;
|
|
|
|
// T
|
|
// [B N L R S]
|
|
// S
|
|
static constexpr int kRectRegionRuns = 7;
|
|
|
|
struct RunHead;
|
|
|
|
static RunHead* emptyRunHeadPtr() { return (SkRegion::RunHead*) -1; }
|
|
static constexpr RunHead* kRectRunHeadPtr = nullptr;
|
|
|
|
// allocate space for count runs
|
|
void allocateRuns(int count);
|
|
void allocateRuns(int count, int ySpanCount, int intervalCount);
|
|
void allocateRuns(const RunHead& src);
|
|
|
|
SkDEBUGCODE(void dump() const;)
|
|
|
|
SkIRect fBounds;
|
|
RunHead* fRunHead;
|
|
|
|
void freeRuns();
|
|
|
|
/**
|
|
* Return the runs from this region, consing up fake runs if the region
|
|
* is empty or a rect. In those 2 cases, we use tmpStorage to hold the
|
|
* run data.
|
|
*/
|
|
const RunType* getRuns(RunType tmpStorage[], int* intervals) const;
|
|
|
|
// This is called with runs[] that do not yet have their interval-count
|
|
// field set on each scanline. That is computed as part of this call
|
|
// (inside ComputeRunBounds).
|
|
bool setRuns(RunType runs[], int count);
|
|
|
|
int count_runtype_values(int* itop, int* ibot) const;
|
|
|
|
bool isValid() const;
|
|
|
|
static void BuildRectRuns(const SkIRect& bounds,
|
|
RunType runs[kRectRegionRuns]);
|
|
|
|
// If the runs define a simple rect, return true and set bounds to that
|
|
// rect. If not, return false and ignore bounds.
|
|
static bool RunsAreARect(const SkRegion::RunType runs[], int count,
|
|
SkIRect* bounds);
|
|
|
|
/**
|
|
* If the last arg is null, just return if the result is non-empty,
|
|
* else store the result in the last arg.
|
|
*/
|
|
static bool Oper(const SkRegion&, const SkRegion&, SkRegion::Op, SkRegion*);
|
|
|
|
friend struct RunHead;
|
|
friend class Iterator;
|
|
friend class Spanerator;
|
|
friend class SkRegionPriv;
|
|
friend class SkRgnBuilder;
|
|
friend class SkFlatRegion;
|
|
};
|
|
|
|
#endif
|