SkClipStack::Iter Class Reference

#include <SkClipStack.h>

Inheritance diagram for SkClipStack::Iter:

Public Types
enum	IterStart { kBottom_IterStart = SkDeque::Iter::kFront_IterStart , kTop_IterStart = SkDeque::Iter::kBack_IterStart }

Public Member Functions
	Iter ()
	Iter (const SkClipStack &stack, IterStart startLoc)
const Element *	next ()
const Element *	prev ()
const Element *	skipToTopmost (SkClipOp op)
void	reset (const SkClipStack &stack, IterStart startLoc)

Detailed Description

Definition at line 400 of file SkClipStack.h.

Member Enumeration Documentation

IterStart

enum SkClipStack::Iter::IterStart

Enumerator
kBottom_IterStart
kTop_IterStart

Definition at line 402 of file SkClipStack.h.

                       {
            kBottom_IterStart = SkDeque::Iter::kFront_IterStart,
            kTop_IterStart = SkDeque::Iter::kBack_IterStart
        };

Constructor & Destructor Documentation

Iter() [1/2]

SkClipStack::Iter::Iter

(

)

Creates an uninitialized iterator. Must be reset()

Definition at line 786 of file SkClipStack.cpp.

                      : fStack(nullptr) {
}

Iter() [2/2]

SkClipStack::Iter::Iter	(	const SkClipStack &	stack,
		IterStart	startLoc
	)

Definition at line 789 of file SkClipStack.cpp.

    : fStack(&stack) {
    this->reset(stack, startLoc);
}

Member Function Documentation

next()

const SkClipStack::Element * SkClipStack::Iter::next

(

)

Return the clip element for this iterator. If next()/prev() returns NULL, then the iterator is done.

Definition at line 794 of file SkClipStack.cpp.

                                                {
    return (const SkClipStack::Element*)fIter.next();
}

prev()

const SkClipStack::Element * SkClipStack::Iter::prev

(

)

Definition at line 798 of file SkClipStack.cpp.

                                                {
    return (const SkClipStack::Element*)fIter.prev();
}

reset()

void SkClipStack::Iter::reset	(	const SkClipStack &	stack,
		IterStart	startLoc
	)

Restarts the iterator on a clip stack.

Definition at line 840 of file SkClipStack.cpp.

                                                                        {
    fStack = &stack;
    fIter.reset(stack.fDeque, static_cast<SkDeque::Iter::IterStart>(startLoc));
}

skipToTopmost()

const SkClipStack::Element * SkClipStack::Iter::skipToTopmost

(

SkClipOp

op

)

Moves the iterator to the topmost element with the specified RegionOp and returns that element. If no clip element with that op is found, the first element is returned.

Definition at line 802 of file SkClipStack.cpp.

                                                                    {
    if (nullptr == fStack) {
        return nullptr;
    }
 
    fIter.reset(fStack->fDeque, SkDeque::Iter::kBack_IterStart);
 
    const SkClipStack::Element* element = nullptr;
 
    for (element = (const SkClipStack::Element*) fIter.prev();
         element;
         element = (const SkClipStack::Element*) fIter.prev()) {
 
        if (op == element->fOp) {
            // The Deque's iterator is actually one pace ahead of the
            // returned value. So while "element" is the element we want to
            // return, the iterator is actually pointing at (and will
            // return on the next "next" or "prev" call) the element
            // in front of it in the deque. Bump the iterator forward a
            // step so we get the expected result.
            if (nullptr == fIter.next()) {
                // The reverse iterator has run off the front of the deque
                // (i.e., the "op" clip is the first clip) and can't
                // recover. Reset the iterator to start at the front.
                fIter.reset(fStack->fDeque, SkDeque::Iter::kFront_IterStart);
            }
            break;
        }
    }
 
    if (nullptr == element) {
        // There were no "op" clips
        fIter.reset(fStack->fDeque, SkDeque::Iter::kFront_IterStart);
    }
 
    return this->next();
}

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The documentation for this class was generated from the following files:

• third_party/skia/src/core/SkClipStack.h
• third_party/skia/src/core/SkClipStack.cpp