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
GrPathRendererChain(GrContext * context)17 GrPathRendererChain::GrPathRendererChain(GrContext* context)
18 : fInit(false)
19 , fOwner(context) {
20 }
21
~GrPathRendererChain()22 GrPathRendererChain::~GrPathRendererChain() {
23 for (int i = 0; i < fChain.count(); ++i) {
24 fChain[i]->unref();
25 }
26 }
27
addPathRenderer(GrPathRenderer * pr)28 GrPathRenderer* GrPathRendererChain::addPathRenderer(GrPathRenderer* pr) {
29 fChain.push_back() = pr;
30 pr->ref();
31 return pr;
32 }
33
getPathRenderer(const GrDrawTarget * target,const GrPipelineBuilder * pipelineBuilder,const SkMatrix & viewMatrix,const SkPath & path,const GrStrokeInfo & stroke,DrawType drawType,StencilSupport * stencilSupport)34 GrPathRenderer* GrPathRendererChain::getPathRenderer(const GrDrawTarget* target,
35 const GrPipelineBuilder* pipelineBuilder,
36 const SkMatrix& viewMatrix,
37 const SkPath& path,
38 const GrStrokeInfo& stroke,
39 DrawType drawType,
40 StencilSupport* stencilSupport) {
41 if (!fInit) {
42 this->init();
43 }
44 bool antiAlias = (kColorAntiAlias_DrawType == drawType ||
45 kStencilAndColorAntiAlias_DrawType == drawType);
46
47 GR_STATIC_ASSERT(GrPathRenderer::kNoSupport_StencilSupport <
48 GrPathRenderer::kStencilOnly_StencilSupport);
49 GR_STATIC_ASSERT(GrPathRenderer::kStencilOnly_StencilSupport <
50 GrPathRenderer::kNoRestriction_StencilSupport);
51 GrPathRenderer::StencilSupport minStencilSupport;
52 if (kStencilOnly_DrawType == drawType) {
53 minStencilSupport = GrPathRenderer::kStencilOnly_StencilSupport;
54 } else if (kStencilAndColor_DrawType == drawType ||
55 kStencilAndColorAntiAlias_DrawType == drawType) {
56 minStencilSupport = GrPathRenderer::kNoRestriction_StencilSupport;
57 } else {
58 minStencilSupport = GrPathRenderer::kNoSupport_StencilSupport;
59 }
60
61
62 for (int i = 0; i < fChain.count(); ++i) {
63 if (fChain[i]->canDrawPath(target, pipelineBuilder, viewMatrix, path, stroke, antiAlias)) {
64 if (GrPathRenderer::kNoSupport_StencilSupport != minStencilSupport) {
65 GrPathRenderer::StencilSupport support =
66 fChain[i]->getStencilSupport(target, pipelineBuilder, path, stroke);
67 if (support < minStencilSupport) {
68 continue;
69 } else if (stencilSupport) {
70 *stencilSupport = support;
71 }
72 }
73 return fChain[i];
74 }
75 }
76 return NULL;
77 }
78
init()79 void GrPathRendererChain::init() {
80 SkASSERT(!fInit);
81 GrGpu* gpu = fOwner->getGpu();
82 bool twoSided = gpu->caps()->twoSidedStencilSupport();
83 bool wrapOp = gpu->caps()->stencilWrapOpsSupport();
84 GrPathRenderer::AddPathRenderers(fOwner, this);
85 this->addPathRenderer(SkNEW_ARGS(GrDefaultPathRenderer,
86 (twoSided, wrapOp)))->unref();
87 fInit = true;
88 }
89