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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrPathStencilSettings_DEFINED
#define GrPathStencilSettings_DEFINED
////////////////////////////////////////////////////////////////////////////////
// Stencil rules for paths
////// Even/Odd
static constexpr GrStencilSettings gEOStencilPass(
kInvert_StencilOp,
kKeep_StencilOp,
kAlwaysIfInClip_StencilFunc,
0xffff,
0xffff,
0xffff);
// ok not to check clip b/c stencil pass only wrote inside clip
static constexpr GrStencilSettings gEOColorPass(
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
// have to check clip b/c outside clip will always be zero.
static constexpr GrStencilSettings gInvEOColorPass(
kZero_StencilOp,
kZero_StencilOp,
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
////// Winding
// when we have separate stencil we increment front faces / decrement back faces
// when we don't have wrap incr and decr we use the stencil test to simulate
// them.
static constexpr GrStencilSettings gWindStencilSeparateWithWrap(
kIncWrap_StencilOp, kDecWrap_StencilOp,
kKeep_StencilOp, kKeep_StencilOp,
kAlwaysIfInClip_StencilFunc, kAlwaysIfInClip_StencilFunc,
0xffff, 0xffff,
0xffff, 0xffff,
0xffff, 0xffff);
// if inc'ing the max value, invert to make 0
// if dec'ing zero invert to make all ones.
// we can't avoid touching the stencil on both passing and
// failing, so we can't resctrict ourselves to the clip.
static constexpr GrStencilSettings gWindStencilSeparateNoWrap(
kInvert_StencilOp, kInvert_StencilOp,
kIncClamp_StencilOp, kDecClamp_StencilOp,
kEqual_StencilFunc, kEqual_StencilFunc,
0xffff, 0xffff,
0xffff, 0x0000,
0xffff, 0xffff);
// When there are no separate faces we do two passes to setup the winding rule
// stencil. First we draw the front faces and inc, then we draw the back faces
// and dec. These are same as the above two split into the incrementing and
// decrementing passes.
static constexpr GrStencilSettings gWindSingleStencilWithWrapInc(
kIncWrap_StencilOp,
kKeep_StencilOp,
kAlwaysIfInClip_StencilFunc,
0xffff,
0xffff,
0xffff);
static constexpr GrStencilSettings gWindSingleStencilWithWrapDec(
kDecWrap_StencilOp,
kKeep_StencilOp,
kAlwaysIfInClip_StencilFunc,
0xffff,
0xffff,
0xffff);
static constexpr GrStencilSettings gWindSingleStencilNoWrapInc(
kInvert_StencilOp,
kIncClamp_StencilOp,
kEqual_StencilFunc,
0xffff,
0xffff,
0xffff);
static constexpr GrStencilSettings gWindSingleStencilNoWrapDec(
kInvert_StencilOp,
kDecClamp_StencilOp,
kEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
// Color passes are the same whether we use the two-sided stencil or two passes
static constexpr GrStencilSettings gWindColorPass(
kZero_StencilOp,
kZero_StencilOp,
kNonZeroIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
static constexpr GrStencilSettings gInvWindColorPass(
kZero_StencilOp,
kZero_StencilOp,
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
////// Normal render to stencil
// Sometimes the default path renderer can draw a path directly to the stencil
// buffer without having to first resolve the interior / exterior.
static constexpr GrStencilSettings gDirectToStencil(
kZero_StencilOp,
kIncClamp_StencilOp,
kAlwaysIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
#endif
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