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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 "GrRenderTarget.h"
#include "GrRenderTargetPriv.h"
#include "SkStrokeRec.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(GrContext* context) {
SkASSERT(context);
SkASSERT(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 GrDrawTarget* target,
const GrPipelineBuilder* pipelineBuilder,
const SkMatrix& viewMatrix,
const SkPath& path,
const SkStrokeRec& stroke,
bool antiAlias) const {
return !stroke.isHairlineStyle() &&
!antiAlias && // doesn't do per-path AA, relies on the target having MSAA
pipelineBuilder->getStencil().isDisabled();
}
GrPathRenderer::StencilSupport
GrStencilAndCoverPathRenderer::onGetStencilSupport(const GrDrawTarget*,
const GrPipelineBuilder*,
const SkPath&,
const SkStrokeRec&) const {
return GrPathRenderer::kStencilOnly_StencilSupport;
}
static GrPath* get_gr_path(GrGpu* gpu, const SkPath& skPath, const SkStrokeRec& stroke) {
GrContext* ctx = gpu->getContext();
GrUniqueKey key;
GrPath::ComputeKey(skPath, stroke, &key);
SkAutoTUnref<GrPath> path(static_cast<GrPath*>(ctx->findAndRefCachedResource(key)));
if (NULL == path || !path->isEqualTo(skPath, stroke)) {
path.reset(gpu->pathRendering()->createPath(skPath, stroke));
ctx->addResourceToCache(key, path);
}
return path.detach();
}
void GrStencilAndCoverPathRenderer::onStencilPath(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
const SkMatrix& viewMatrix,
const SkPath& path,
const SkStrokeRec& stroke) {
SkASSERT(!path.isInverseFillType());
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, viewMatrix));
SkAutoTUnref<GrPath> p(get_gr_path(fGpu, path, stroke));
target->stencilPath(pipelineBuilder, pp, p, convert_skpath_filltype(path.getFillType()));
}
bool GrStencilAndCoverPathRenderer::onDrawPath(GrDrawTarget* target,
GrPipelineBuilder* pipelineBuilder,
GrColor color,
const SkMatrix& viewMatrix,
const SkPath& path,
const SkStrokeRec& stroke,
bool antiAlias) {
SkASSERT(!antiAlias);
SkASSERT(!stroke.isHairlineStyle());
SkASSERT(pipelineBuilder->getStencil().isDisabled());
SkAutoTUnref<GrPath> p(get_gr_path(fGpu, 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);
pipelineBuilder->setStencil(kInvertedStencilPass);
// fake inverse with a stencil and cover
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, viewMatrix));
target->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;
target->drawRect(pipelineBuilder, color, viewM, bounds, NULL, &invert);
} else {
GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
kZero_StencilOp,
kZero_StencilOp,
kNotEqual_StencilFunc,
0xffff,
0x0000,
0xffff);
pipelineBuilder->setStencil(kStencilPass);
SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(color, viewMatrix));
target->drawPath(pipelineBuilder, pp, p, convert_skpath_filltype(path.getFillType()));
}
pipelineBuilder->stencil()->setDisabled();
return true;
}
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