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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 "GrContext.h"
#include "GrDrawTargetCaps.h"
#include "GrGpu.h"
#include "GrPath.h"
#include "SkStrokeRec.h"
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrContext* context) {
SkASSERT(NULL != context);
SkASSERT(NULL != context->getGpu());
if (context->getGpu()->caps()->pathRenderingSupport()) {
return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (context->getGpu()));
} else {
return NULL;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrGpu* gpu) {
SkASSERT(gpu->caps()->pathRenderingSupport());
fGpu = gpu;
gpu->ref();
}
GrStencilAndCoverPathRenderer::~GrStencilAndCoverPathRenderer() {
fGpu->unref();
}
bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
const GrDrawTarget* target,
bool antiAlias) const {
return !stroke.isHairlineStyle() &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
NULL != target->getDrawState().getRenderTarget()->getStencilBuffer() &&
target->getDrawState().getStencil().isDisabled();
}
GrPathRenderer::StencilSupport GrStencilAndCoverPathRenderer::onGetStencilSupport(
const SkPath&,
const SkStrokeRec& ,
const GrDrawTarget*) const {
return GrPathRenderer::kStencilOnly_StencilSupport;
}
void GrStencilAndCoverPathRenderer::onStencilPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target) {
SkASSERT(!path.isInverseFillType());
SkAutoTUnref<GrPath> p(fGpu->getContext()->createPath(path, stroke));
target->stencilPath(p, path.getFillType());
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
const SkStrokeRec& stroke,
GrDrawTarget* target,
bool antiAlias) {
SkASSERT(!antiAlias);
SkASSERT(!stroke.isHairlineStyle());
GrDrawState* drawState = target->drawState();
SkASSERT(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->getContext()->createPath(path, stroke));
if (path.isInverseFillType()) {
GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
kZero_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);
*drawState->stencil() = kInvertedStencilPass;
} else {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
}
target->drawPath(p, path.getFillType());
target->drawState()->stencil()->setDisabled();
return true;
}
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