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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrStencilAndCoverPathRenderer.h"
#include "GrCaps.h"
#include "GrContext.h"
#include "GrDrawPathOp.h"
#include "GrFixedClip.h"
#include "GrGpu.h"
#include "GrPath.h"
#include "GrPipelineBuilder.h"
#include "GrRenderTarget.h"
#include "GrRenderTargetContextPriv.h"
#include "GrResourceProvider.h"
#include "GrStencilPathOp.h"
#include "GrStyle.h"
#include "ops/GrRectOpFactory.h"
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrResourceProvider* resourceProvider,
const GrCaps& caps) {
if (caps.shaderCaps()->pathRenderingSupport() && !caps.avoidStencilBuffers()) {
return new GrStencilAndCoverPathRenderer(resourceProvider);
} else {
return nullptr;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrResourceProvider* resourceProvider)
: fResourceProvider(resourceProvider) {
}
bool GrStencilAndCoverPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const {
// GrPath doesn't support hairline paths. An arbitrary path effect could produce a hairline
// path.
if (args.fShape->style().strokeRec().isHairlineStyle() ||
args.fShape->style().hasNonDashPathEffect()) {
return false;
}
if (args.fHasUserStencilSettings) {
return false;
}
// doesn't do per-path AA, relies on the target having MSAA.
return (GrAAType::kCoverage != args.fAAType);
}
static GrPath* get_gr_path(GrResourceProvider* resourceProvider, const GrShape& shape) {
GrUniqueKey key;
bool isVolatile;
GrPath::ComputeKey(shape, &key, &isVolatile);
sk_sp<GrPath> path;
if (!isVolatile) {
path.reset(
static_cast<GrPath*>(resourceProvider->findAndRefResourceByUniqueKey(key)));
}
if (!path) {
SkPath skPath;
shape.asPath(&skPath);
path.reset(resourceProvider->createPath(skPath, shape.style()));
if (!isVolatile) {
resourceProvider->assignUniqueKeyToResource(key, path.get());
}
} else {
#ifdef SK_DEBUG
SkPath skPath;
shape.asPath(&skPath);
SkASSERT(path->isEqualTo(skPath, shape.style()));
#endif
}
return path.release();
}
void GrStencilAndCoverPathRenderer::onStencilPath(const StencilPathArgs& args) {
GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(),
"GrStencilAndCoverPathRenderer::onStencilPath");
sk_sp<GrPath> p(get_gr_path(fResourceProvider, *args.fShape));
args.fRenderTargetContext->priv().stencilPath(*args.fClip, args.fAAType,
*args.fViewMatrix, p.get());
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const DrawPathArgs& args) {
GR_AUDIT_TRAIL_AUTO_FRAME(args.fRenderTargetContext->auditTrail(),
"GrStencilAndCoverPathRenderer::onDrawPath");
SkASSERT(!args.fShape->style().strokeRec().isHairlineStyle());
const SkMatrix& viewMatrix = *args.fViewMatrix;
sk_sp<GrPath> path(get_gr_path(fResourceProvider, *args.fShape));
if (args.fShape->inverseFilled()) {
SkMatrix invert = SkMatrix::I();
SkRect bounds =
SkRect::MakeLTRB(0, 0,
SkIntToScalar(args.fRenderTargetContext->width()),
SkIntToScalar(args.fRenderTargetContext->height()));
SkMatrix vmi;
// mapRect through persp matrix may not be correct
if (!viewMatrix.hasPerspective() && viewMatrix.invert(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
SkScalar bloat = viewMatrix.getMaxScale() * SK_ScalarHalf;
bounds.outset(bloat, bloat);
} else {
if (!viewMatrix.invert(&invert)) {
return false;
}
}
const SkMatrix& viewM = viewMatrix.hasPerspective() ? SkMatrix::I() : viewMatrix;
std::unique_ptr<GrLegacyMeshDrawOp> coverOp(GrRectOpFactory::MakeNonAAFill(
args.fPaint.getColor(), viewM, bounds, nullptr, &invert));
// fake inverse with a stencil and cover
args.fRenderTargetContext->priv().stencilPath(*args.fClip, args.fAAType, viewMatrix,
path.get());
{
static constexpr GrUserStencilSettings kInvertedCoverPass(
GrUserStencilSettings::StaticInit<
0x0000,
// We know our rect will hit pixels outside the clip and the user bits will
// be 0 outside the clip. So we can't just fill where the user bits are 0. We
// also need to check that the clip bit is set.
GrUserStencilTest::kEqualIfInClip,
0xffff,
GrUserStencilOp::kKeep,
GrUserStencilOp::kZero,
0xffff>()
);
// We have to suppress enabling MSAA for mixed samples or we will get seams due to
// coverage modulation along the edge where two triangles making up the rect meet.
GrAAType coverAAType = args.fAAType;
if (GrAAType::kMixedSamples == coverAAType) {
coverAAType = GrAAType::kNone;
}
GrPipelineBuilder pipelineBuilder(std::move(args.fPaint), coverAAType);
pipelineBuilder.setUserStencil(&kInvertedCoverPass);
args.fRenderTargetContext->addLegacyMeshDrawOp(std::move(pipelineBuilder), *args.fClip,
std::move(coverOp));
}
} else {
std::unique_ptr<GrDrawOp> op =
GrDrawPathOp::Make(viewMatrix, std::move(args.fPaint), args.fAAType, path.get());
args.fRenderTargetContext->addDrawOp(*args.fClip, std::move(op));
}
return true;
}
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