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 SkPath & path,const SkStrokeRec & stroke,const GrDrawTarget * target,DrawType drawType,StencilSupport * stencilSupport)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
init()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