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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 "GrDrawContextPriv.h"
#include "GrDrawPathBatch.h"
#include "GrGpu.h"
#include "GrPath.h"
#include "GrRenderTarget.h"
#include "GrResourceProvider.h"
#include "GrStencilPathBatch.h"
#include "GrStyle.h"
#include "batches/GrRectBatchFactory.h"
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrResourceProvider* resourceProvider,
const GrCaps& caps) {
if (caps.shaderCaps()->pathRenderingSupport()) {
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. Also, an arbitrary path effect could change
// the style type to hairline.
if (args.fStyle->hasNonDashPathEffect() || args.fStyle->strokeRec().isHairlineStyle()) {
return false;
}
if (args.fHasUserStencilSettings) {
return false;
}
if (args.fAntiAlias) {
return args.fIsStencilBufferMSAA;
} else {
return true; // doesn't do per-path AA, relies on the target having MSAA
}
}
static GrPath* get_gr_path(GrResourceProvider* resourceProvider, const SkPath& skPath,
const GrStyle& style) {
GrUniqueKey key;
bool isVolatile;
GrPath::ComputeKey(skPath, style, &key, &isVolatile);
SkAutoTUnref<GrPath> path(
static_cast<GrPath*>(resourceProvider->findAndRefResourceByUniqueKey(key)));
if (!path) {
path.reset(resourceProvider->createPath(skPath, style));
if (!isVolatile) {
resourceProvider->assignUniqueKeyToResource(key, path);
}
} else {
SkASSERT(path->isEqualTo(skPath, style));
}
return path.release();
}
void GrStencilAndCoverPathRenderer::onStencilPath(const StencilPathArgs& args) {
GR_AUDIT_TRAIL_AUTO_FRAME(args.fDrawContext->auditTrail(),
"GrStencilAndCoverPathRenderer::onStencilPath");
GrPaint paint;
SkSafeUnref(paint.setXPFactory(GrDisableColorXPFactory::Create()));
paint.setAntiAlias(args.fIsAA);
GrPipelineBuilder pipelineBuilder(paint, args.fDrawContext->isUnifiedMultisampled());
pipelineBuilder.setRenderTarget(args.fDrawContext->accessRenderTarget());
SkASSERT(!args.fPath->isInverseFillType());
SkAutoTUnref<GrPath> path(get_gr_path(fResourceProvider, *args.fPath, GrStyle::SimpleFill()));
args.fDrawContext->drawContextPriv().stencilPath(pipelineBuilder,
*args.fClip,
*args.fViewMatrix,
path,
path->getFillType());
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const DrawPathArgs& args) {
GR_AUDIT_TRAIL_AUTO_FRAME(args.fDrawContext->auditTrail(),
"GrStencilAndCoverPathRenderer::onDrawPath");
SkASSERT(!args.fStyle->strokeRec().isHairlineStyle());
const SkPath& path = *args.fPath;
const SkMatrix& viewMatrix = *args.fViewMatrix;
SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, path, *args.fStyle));
if (path.isInverseFillType()) {
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>()
);
// fake inverse with a stencil and cover
{
GrPipelineBuilder pipelineBuilder(*args.fPaint,
args.fDrawContext->isUnifiedMultisampled());
pipelineBuilder.setRenderTarget(args.fDrawContext->accessRenderTarget());
pipelineBuilder.setUserStencil(&kInvertedCoverPass);
if (args.fAntiAlias) {
SkASSERT(args.fDrawContext->isStencilBufferMultisampled());
pipelineBuilder.enableState(GrPipelineBuilder::kHWAntialias_Flag);
}
args.fDrawContext->drawContextPriv().stencilPath(pipelineBuilder, *args.fClip,
viewMatrix, p, p->getFillType());
}
SkMatrix invert = SkMatrix::I();
SkRect bounds =
SkRect::MakeLTRB(0, 0,
SkIntToScalar(args.fDrawContext->width()),
SkIntToScalar(args.fDrawContext->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;
SkAutoTUnref<GrDrawBatch> batch(
GrRectBatchFactory::CreateNonAAFill(args.fColor, viewM, bounds, nullptr,
&invert));
{
GrPipelineBuilder pipelineBuilder(*args.fPaint,
args.fDrawContext->isUnifiedMultisampled());
pipelineBuilder.setRenderTarget(args.fDrawContext->accessRenderTarget());
pipelineBuilder.setUserStencil(&kInvertedCoverPass);
if (args.fAntiAlias) {
SkASSERT(args.fDrawContext->isStencilBufferMultisampled());
pipelineBuilder.enableState(GrPipelineBuilder::kHWAntialias_Flag);
}
if (args.fDrawContext->hasMixedSamples()) {
pipelineBuilder.disableState(GrPipelineBuilder::kHWAntialias_Flag);
}
args.fDrawContext->drawBatch(pipelineBuilder, *args.fClip, batch);
}
} else {
static constexpr GrUserStencilSettings kCoverPass(
GrUserStencilSettings::StaticInit<
0x0000,
GrUserStencilTest::kNotEqual,
0xffff,
GrUserStencilOp::kZero,
GrUserStencilOp::kKeep,
0xffff>()
);
SkAutoTUnref<GrDrawBatch> batch(
GrDrawPathBatch::Create(viewMatrix, args.fColor, p->getFillType(), p));
GrPipelineBuilder pipelineBuilder(*args.fPaint,
args.fDrawContext->isUnifiedMultisampled());
pipelineBuilder.setRenderTarget(args.fDrawContext->accessRenderTarget());
pipelineBuilder.setUserStencil(&kCoverPass);
if (args.fAntiAlias) {
SkASSERT(args.fDrawContext->isStencilBufferMultisampled());
pipelineBuilder.enableState(GrPipelineBuilder::kHWAntialias_Flag);
}
args.fDrawContext->drawBatch(pipelineBuilder, *args.fClip, batch);
}
return true;
}
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