Implement support for mixed sampled render targets

src/gpu/GrStencilAndCoverPathRenderer.cpp

Index: src/gpu/GrStencilAndCoverPathRenderer.cpp
diff --git a/src/gpu/GrStencilAndCoverPathRenderer.cpp b/src/gpu/GrStencilAndCoverPathRenderer.cpp
index aed1743af22216864a2aa2382a2ea724cc0c82a9..54b646c747b5b9f314a40798c9cf50172b15d57b 100644
--- a/src/gpu/GrStencilAndCoverPathRenderer.cpp
+++ b/src/gpu/GrStencilAndCoverPathRenderer.cpp
@@ -59,7 +59,8 @@ bool GrStencilAndCoverPathRenderer::canDrawPath(const GrDrawTarget* target,
                                                 const SkStrokeRec& stroke,
                                                 bool antiAlias) const {
     return !stroke.isHairlineStyle() &&
-           !antiAlias && // doesn't do per-path AA, relies on the target having MSAA
+           (!antiAlias || // doesn't do per-path AA, relies on the target having MSAA
+           pipelineBuilder->getRenderTarget()->isMultisampled(kStencil_GrSampleConfig)) &&
            pipelineBuilder->getStencil().isDisabled();

[Chris Dalton, 2015/03/17 00:39:35]

Here we can punt and only use nvfms if coverage modulation will work. I'm going
to break it up just because it's getting more complicated..

 if (stroke.isHairlineStyle()) {
     return false;
 }
 if (!pipelineBuilder->getStencil().isDisabled()) {
     return false;
 }
 if (antiAlias) {
     return
pipelineBuilder->getRenderTarget()->isMultisampled(kStencil_GrSampleConfig)) &&
            pipelineBuilder->canTweakAlphaForCoverage();
 } else {
     return true;
 }

 }
 
@@ -101,7 +102,8 @@ bool GrStencilAndCoverPathRenderer::onDrawPath(GrDrawTarget* target,
                                                const SkPath& path,
                                                const SkStrokeRec& stroke,
                                                bool antiAlias) {
-    SkASSERT(!antiAlias);
+    SkASSERT(!antiAlias ||
+             pipelineBuilder->getRenderTarget()->isMultisampled(kStencil_GrSampleConfig));

[Chris Dalton, 2015/03/16 19:31:24]

We can take out this assert from here since we do it below.

     SkASSERT(!stroke.isHairlineStyle());
 
     SkASSERT(pipelineBuilder->getStencil().isDisabled());
@@ -160,5 +162,9 @@ bool GrStencilAndCoverPathRenderer::onDrawPath(GrDrawTarget* target,
     }
 
     pipelineBuilder->stencil()->setDisabled();
+    if (antiAlias) {
+        SkASSERT(pipelineBuilder->getRenderTarget()->isMultisampled(kStencil_GrSampleConfig));
+        pipelineBuilder->enableState(GrPipelineBuilder::kHWAntialias_StateBit);
+    }
     return true;
 }