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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 "GrGpu.h"
#include "GrPath.h"
GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrContext* context) {
GrAssert(NULL != context);
GrAssert(NULL != context->getGpu());
if (context->getGpu()->getCaps().pathStencilingSupport()) {
return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (context->getGpu()));
} else {
return NULL;
}
}
GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrGpu* gpu) {
GrAssert(gpu->getCaps().pathStencilingSupport());
fGpu = gpu;
gpu->ref();
}
GrStencilAndCoverPathRenderer::~GrStencilAndCoverPathRenderer() {
fGpu->unref();
}
bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
GrPathFill fill,
const GrDrawTarget* target,
bool antiAlias) const {
return kHairLine_GrPathFill != fill &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
target->getDrawState().getStencil().isDisabled();
}
bool GrStencilAndCoverPathRenderer::requiresStencilPass(const SkPath& path,
GrPathFill fill,
const GrDrawTarget* target) const {
return true;
}
void GrStencilAndCoverPathRenderer::drawPathToStencil(const SkPath& path,
GrPathFill fill,
GrDrawTarget* target) {
GrAssert(kEvenOdd_GrPathFill == fill || kWinding_GrPathFill == fill);
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
target->stencilPath(p, fill);
}
bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
GrPathFill fill,
GrDrawTarget* target,
bool antiAlias) {
GrAssert(!antiAlias);
GrAssert(kHairLine_GrPathFill != fill);
GrDrawState* drawState = target->drawState();
GrAssert(drawState->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(fGpu->createPath(path));
GrPathFill nonInvertedFill = GrNonInvertedFill(fill);
target->stencilPath(p, nonInvertedFill);
// TODO: Use built in cover operation rather than a rect draw. This will require making our
// fragment shaders be able to eat varyings generated by a matrix.
// fill the path, zero out the stencil
GrRect bounds = p->getBounds();
GrScalar bloat = drawState->getViewMatrix().getMaxStretch() * GR_ScalarHalf;
GrDrawState::AutoDeviceCoordDraw adcd;
if (nonInvertedFill == fill) {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
*drawState->stencil() = kStencilPass;
} else {
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);
GrMatrix vmi;
bounds.setLTRB(0, 0,
GrIntToScalar(drawState->getRenderTarget()->width()),
GrIntToScalar(drawState->getRenderTarget()->height()));
// mapRect through persp matrix may not be correct
if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
vmi.mapRect(&bounds);
// theoretically could set bloat = 0, instead leave it because of matrix inversion
// precision.
} else {
adcd.set(drawState);
bloat = 0;
}
*drawState->stencil() = kInvertedStencilPass;
}
bounds.outset(bloat, bloat);
target->drawSimpleRect(bounds, NULL);
target->drawState()->stencil()->setDisabled();
return true;
}
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