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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #include "GrPathRendererChain.h"
     11 
     12 #include "GrContext.h"
     13 #include "GrDefaultPathRenderer.h"
     14 #include "GrDrawTargetCaps.h"
     15 #include "GrGpu.h"
     16 
     17 GrPathRendererChain::GrPathRendererChain(GrContext* context)
     18     : fInit(false)
     19     , fOwner(context) {
     20 }
     21 
     22 GrPathRendererChain::~GrPathRendererChain() {
     23     for (int i = 0; i < fChain.count(); ++i) {
     24         fChain[i]->unref();
     25     }
     26 }
     27 
     28 GrPathRenderer* GrPathRendererChain::addPathRenderer(GrPathRenderer* pr) {
     29     fChain.push_back() = pr;
     30     pr->ref();
     31     return pr;
     32 }
     33 
     34 GrPathRenderer* GrPathRendererChain::getPathRenderer(const SkPath& path,
     35                                                      const SkStrokeRec& stroke,
     36                                                      const GrDrawTarget* target,
     37                                                      DrawType drawType,
     38                                                      StencilSupport* stencilSupport) {
     39     if (!fInit) {
     40         this->init();
     41     }
     42     bool antiAlias = (kColorAntiAlias_DrawType == drawType ||
     43                       kStencilAndColorAntiAlias_DrawType == drawType);
     44 
     45     GR_STATIC_ASSERT(GrPathRenderer::kNoSupport_StencilSupport <
     46                      GrPathRenderer::kStencilOnly_StencilSupport);
     47     GR_STATIC_ASSERT(GrPathRenderer::kStencilOnly_StencilSupport <
     48                      GrPathRenderer::kNoRestriction_StencilSupport);
     49     GrPathRenderer::StencilSupport minStencilSupport;
     50     if (kStencilOnly_DrawType == drawType) {
     51         minStencilSupport = GrPathRenderer::kStencilOnly_StencilSupport;
     52     } else if (kStencilAndColor_DrawType == drawType ||
     53                kStencilAndColorAntiAlias_DrawType == drawType) {
     54         minStencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
     55     } else {
     56         minStencilSupport = GrPathRenderer::kNoSupport_StencilSupport;
     57     }
     58 
     59 
     60     for (int i = 0; i < fChain.count(); ++i) {
     61         if (fChain[i]->canDrawPath(path, stroke, target, antiAlias)) {
     62             if (GrPathRenderer::kNoSupport_StencilSupport != minStencilSupport) {
     63                 GrPathRenderer::StencilSupport support = fChain[i]->getStencilSupport(path,
     64                                                                                       stroke,
     65                                                                                       target);
     66                 if (support < minStencilSupport) {
     67                     continue;
     68                 } else if (stencilSupport) {
     69                     *stencilSupport = support;
     70                 }
     71             }
     72             return fChain[i];
     73         }
     74     }
     75     return NULL;
     76 }
     77 
     78 void GrPathRendererChain::init() {
     79     SkASSERT(!fInit);
     80     GrGpu* gpu = fOwner->getGpu();
     81     bool twoSided = gpu->caps()->twoSidedStencilSupport();
     82     bool wrapOp = gpu->caps()->stencilWrapOpsSupport();
     83     GrPathRenderer::AddPathRenderers(fOwner, this);
     84     this->addPathRenderer(SkNEW_ARGS(GrDefaultPathRenderer,
     85                                      (twoSided, wrapOp)))->unref();
     86     fInit = true;
     87 }
     88