michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #include "GrStencilAndCoverPathRenderer.h"
michael@0: #include "GrContext.h"
michael@0: #include "GrDrawTargetCaps.h"
michael@0: #include "GrGpu.h"
michael@0: #include "GrPath.h"
michael@0: #include "SkStrokeRec.h"
michael@0: 
michael@0: GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrContext* context) {
michael@0:     SkASSERT(NULL != context);
michael@0:     SkASSERT(NULL != context->getGpu());
michael@0:     if (context->getGpu()->caps()->pathRenderingSupport()) {
michael@0:         return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (context->getGpu()));
michael@0:     } else {
michael@0:         return NULL;
michael@0:     }
michael@0: }
michael@0: 
michael@0: GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrGpu* gpu) {
michael@0:     SkASSERT(gpu->caps()->pathRenderingSupport());
michael@0:     fGpu = gpu;
michael@0:     gpu->ref();
michael@0: }
michael@0: 
michael@0: GrStencilAndCoverPathRenderer::~GrStencilAndCoverPathRenderer() {
michael@0:     fGpu->unref();
michael@0: }
michael@0: 
michael@0: bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
michael@0:                                                 const SkStrokeRec& stroke,
michael@0:                                                 const GrDrawTarget* target,
michael@0:                                                 bool antiAlias) const {
michael@0:     return !stroke.isHairlineStyle() &&
michael@0:            !antiAlias && // doesn't do per-path AA, relies on the target having MSAA
michael@0:            NULL != target->getDrawState().getRenderTarget()->getStencilBuffer() &&
michael@0:            target->getDrawState().getStencil().isDisabled();
michael@0: }
michael@0: 
michael@0: GrPathRenderer::StencilSupport GrStencilAndCoverPathRenderer::onGetStencilSupport(
michael@0:                                                         const SkPath&,
michael@0:                                                         const SkStrokeRec& ,
michael@0:                                                         const GrDrawTarget*) const {
michael@0:     return GrPathRenderer::kStencilOnly_StencilSupport;
michael@0: }
michael@0: 
michael@0: void GrStencilAndCoverPathRenderer::onStencilPath(const SkPath& path,
michael@0:                                                   const SkStrokeRec& stroke,
michael@0:                                                   GrDrawTarget* target) {
michael@0:     SkASSERT(!path.isInverseFillType());
michael@0:     SkAutoTUnref<GrPath> p(fGpu->getContext()->createPath(path, stroke));
michael@0:     target->stencilPath(p, path.getFillType());
michael@0: }
michael@0: 
michael@0: bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
michael@0:                                                const SkStrokeRec& stroke,
michael@0:                                                GrDrawTarget* target,
michael@0:                                                bool antiAlias) {
michael@0:     SkASSERT(!antiAlias);
michael@0:     SkASSERT(!stroke.isHairlineStyle());
michael@0: 
michael@0:     GrDrawState* drawState = target->drawState();
michael@0:     SkASSERT(drawState->getStencil().isDisabled());
michael@0: 
michael@0:     SkAutoTUnref<GrPath> p(fGpu->getContext()->createPath(path, stroke));
michael@0: 
michael@0:     if (path.isInverseFillType()) {
michael@0:         GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
michael@0:             kZero_StencilOp,
michael@0:             kZero_StencilOp,
michael@0:             // We know our rect will hit pixels outside the clip and the user bits will be 0
michael@0:             // outside the clip. So we can't just fill where the user bits are 0. We also need to
michael@0:             // check that the clip bit is set.
michael@0:             kEqualIfInClip_StencilFunc,
michael@0:             0xffff,
michael@0:             0x0000,
michael@0:             0xffff);
michael@0: 
michael@0:         *drawState->stencil() = kInvertedStencilPass;
michael@0:     } else {
michael@0:         GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
michael@0:             kZero_StencilOp,
michael@0:             kZero_StencilOp,
michael@0:             kNotEqual_StencilFunc,
michael@0:             0xffff,
michael@0:             0x0000,
michael@0:             0xffff);
michael@0: 
michael@0:         *drawState->stencil() = kStencilPass;
michael@0:     }
michael@0: 
michael@0:     target->drawPath(p, path.getFillType());
michael@0: 
michael@0:     target->drawState()->stencil()->setDisabled();
michael@0:     return true;
michael@0: }