1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/GrReducedClip.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,43 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2012 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +#include "SkClipStack.h"
1.13 +#include "SkTLList.h"
1.14 +
1.15 +namespace GrReducedClip {
1.16 +
1.17 +typedef SkTLList<SkClipStack::Element> ElementList;
1.18 +
1.19 +enum InitialState {
1.20 + kAllIn_InitialState,
1.21 + kAllOut_InitialState,
1.22 +};
1.23 +
1.24 +/**
1.25 + * This function takes a clip stack and a query rectangle and it produces a reduced set of
1.26 + * SkClipStack::Elements that are equivalent to applying the full stack to the rectangle. The clip
1.27 + * stack generation id that represents the list of elements is returned in resultGenID. The
1.28 + * initial state of the query rectangle before the first clip element is applied is returned via
1.29 + * initialState. Optionally, the caller can request a tighter bounds on the clip be returned via
1.30 + * tighterBounds. If not NULL, tighterBounds will always be contained by queryBounds after return.
1.31 + * If tighterBounds is specified then it is assumed that the caller will implicitly clip against it.
1.32 + * If the caller specifies non-NULL for requiresAA then it will indicate whether anti-aliasing is
1.33 + * required to process any of the elements in the result.
1.34 + *
1.35 + * This may become a member function of SkClipStack when its interface is determined to be stable.
1.36 + * Marked SK_API so that SkLua can call this in a shared library build.
1.37 + */
1.38 +SK_API void ReduceClipStack(const SkClipStack& stack,
1.39 + const SkIRect& queryBounds,
1.40 + ElementList* result,
1.41 + int32_t* resultGenID,
1.42 + InitialState* initialState,
1.43 + SkIRect* tighterBounds = NULL,
1.44 + bool* requiresAA = NULL);
1.45 +
1.46 +} // namespace GrReducedClip
