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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 "GrGpu.h"
#include "GrPath.h"
#include "GrRenderTarget.h"
#include "GrResourceProvider.h"
#include "GrStrokeInfo.h"
/*
* For now paths only natively support winding and even odd fill types
*/
static GrPathRendering::FillType convert_skpath_filltype(SkPath::FillType fill) {
switch (fill) {
default:
SkFAIL("Incomplete Switch\n");
case SkPath::kWinding_FillType:
case SkPath::kInverseWinding_FillType:
return GrPathRendering::kWinding_FillType;
case SkPath::kEvenOdd_FillType:
case SkPath::kInverseEvenOdd_FillType:
return GrPathRendering::kEvenOdd_FillType;
}
}
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrResourceProvider* resourceProvider,
const GrCaps& caps) {
if (caps.shaderCaps()->pathRenderingSupport()) {
return new GrStencilAndCoverPathRenderer(resourceProvider);
} else {
return NULL;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrResourceProvider* resourceProvider)
: fResourceProvider(resourceProvider) {
}
bool GrStencilAndCoverPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const {
if (args.fStroke->isHairlineStyle()) {
return false;
}
if (!args.fPipelineBuilder->getStencil().isDisabled()) {
return false;
}
if (args.fAntiAlias) {
return args.fPipelineBuilder->getRenderTarget()->isStencilBufferMultisampled();
} 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 GrStrokeInfo& stroke) {
GrUniqueKey key;
bool isVolatile;
GrPath::ComputeKey(skPath, stroke, &key, &isVolatile);
SkAutoTUnref<GrPath> path(
static_cast<GrPath*>(resourceProvider->findAndRefResourceByUniqueKey(key)));
if (!path) {
path.reset(resourceProvider->createPath(skPath, stroke));
if (!isVolatile) {
resourceProvider->assignUniqueKeyToResource(key, path);
}
} else {
SkASSERT(path->isEqualTo(skPath, stroke));
}
return path.detach();
}
void GrStencilAndCoverPathRenderer::onStencilPath(const StencilPathArgs& args) {
SkASSERT(!args.fPath->isInverseFillType());
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, *args.fViewMatrix));
SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, *args.fPath, *args.fStroke));
args.fTarget->stencilPath(*args.fPipelineBuilder, pp, p,
convert_skpath_filltype(args.fPath->getFillType()));
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const DrawPathArgs& args) {
SkASSERT(!args.fStroke->isHairlineStyle());
const SkPath& path = *args.fPath;
GrPipelineBuilder* pipelineBuilder = args.fPipelineBuilder;
const SkMatrix& viewMatrix = *args.fViewMatrix;
SkASSERT(pipelineBuilder->getStencil().isDisabled());
if (args.fAntiAlias) {
SkASSERT(pipelineBuilder->getRenderTarget()->isStencilBufferMultisampled());
pipelineBuilder->enableState(GrPipelineBuilder::kHWAntialias_Flag);
}
SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, path, *args.fStroke));
if (path.isInverseFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kKeep_StencilOp,
kZero_StencilOp,
// 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.
kEqualIfInClip_StencilFunc,
0xffff,
0x0000,
0xffff);
pipelineBuilder->setStencil(kInvertedStencilPass);
// fake inverse with a stencil and cover
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, viewMatrix));
args.fTarget->stencilPath(*pipelineBuilder, pp, p,
convert_skpath_filltype(path.getFillType()));
SkMatrix invert = SkMatrix::I();
SkRect bounds =
SkRect::MakeLTRB(0, 0, SkIntToScalar(pipelineBuilder->getRenderTarget()->width()),
SkIntToScalar(pipelineBuilder->getRenderTarget()->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;
args.fTarget->drawNonAARect(*pipelineBuilder, args.fColor, viewM, bounds, invert);
} else {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kKeep_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
pipelineBuilder->setStencil(kStencilPass);
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(args.fColor, viewMatrix));
args.fTarget->drawPath(*pipelineBuilder, pp, p,
convert_skpath_filltype(path.getFillType()));
}
pipelineBuilder->stencil()->setDisabled();
return true;
}
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