added GrMSAAPathRenderer

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1834133003

Committed: https://skia.googlesource.com/skia/+/47a2dc8e229e93e1bcf7405747320920da1ab742

Committed: https://skia.googlesource.com/skia/+/b0fabd4ed55abcb6f5ed2f331c96c783f42bd37c

Review-Url: https://codereview.chromium.org/1834133003

1 files changed, 134 insertions, 0 deletions

diff --git a/src/gpu/batches/GrPathStencilSettings.h b/src/gpu/batches/GrPathStencilSettings.h
new file mode 100644
index 0000000000..dd930a0da7
--- /dev/null
+++ b/src/gpu/batches/GrPathStencilSettings.h
@@ -0,0 +1,134 @@
+/*
+ * 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