Add query to GrXPFactory about coverage-as-alpha optimization

This will be needed to have GrDrawOps that haven't yet built pipelines.

Change-Id: If5292aaa5dc9f98dccbe27be98960b630332158d
Reviewed-on: https://skia-review.googlesource.com/9480
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gpu/GrXferProcessor.cpp b/src/gpu/GrXferProcessor.cpp
index 3b8a2bfb87..4d877d6b27 100644
--- a/src/gpu/GrXferProcessor.cpp
+++ b/src/gpu/GrXferProcessor.cpp
@@ -197,6 +197,13 @@ bool GrXPFactory::WillNeedDstTexture(const GrXPFactory* factory, const GrCaps& c
     return result;
 }
 
+bool GrXPFactory::CompatibleWithCoverageAsAlpha(const GrXPFactory* factory, bool colorIsOpaque) {
+    if (factory) {
+        return factory->compatibleWithCoverageAsAlpha(colorIsOpaque);
+    }
+    return GrPorterDuffXPFactory::SrcOverIsCompatibleWithCoverageAsAlpha();
+}
+
 GrXferProcessor* GrXPFactory::createXferProcessor(const FragmentProcessorAnalysis& analysis,
                                                   bool hasMixedSamples,
                                                   const DstTexture* dstTexture,