Add an InvariantOutput for the XPF.

The Invariant output holds information about final post blended color and other
general information like will it blend with dst. Having this new struct allowed
me to also remove some functions that were previously querying subsets of the
invariant output.

BUG=skia:

Review URL: https://codereview.chromium.org/814933002

1 files changed, 17 insertions, 30 deletions

diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index cddbbfb49e..d956cd31b0 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -186,40 +186,27 @@ GrXferProcessor* GrCoverageSetOpXPFactory::createXferProcessor(const GrProcOptIn
     return GrCoverageSetOpXP::Create(fRegionOp, fInvertCoverage);
 }
 
-bool GrCoverageSetOpXPFactory::willBlendWithDst(const GrProcOptInfo& colorPOI,
-                                                const GrProcOptInfo& coveragePOI,
-                                                bool colorWriteDisabled) const {
-    // TODO: once all SkXferEffects are XP's then we will never reads dst here since only XP's
-    // will readDst and this XP doesn't read dst.
-    if (coveragePOI.readsDst()) {
-        return true;
-    }
-
-    // Besides Replace all other SkRegion ops will either have a src coeff that references dst or a
-    // non zero dst coeff
-    return SkRegion::kReplace_Op != fRegionOp;
-}
-
-bool GrCoverageSetOpXPFactory::getOpaqueAndKnownColor(const GrProcOptInfo& colorPOI,
-                                                      const GrProcOptInfo& coveragePOI,
-                                                      GrColor* solidColor,
-                                                      uint32_t* solidColorKnownComponents) const {
-    if (!coveragePOI.isSolidWhite()) {
-        return false;
-    }
-
-    SkASSERT((NULL == solidColor) == (NULL == solidColorKnownComponents));
+void GrCoverageSetOpXPFactory::getInvariantOutput(const GrProcOptInfo& colorPOI,
+                                                  const GrProcOptInfo& coveragePOI,
+                                                  bool colorWriteDisabled,
+                                                  GrXPFactory::InvariantOutput* output) const {
+    if (SkRegion::kReplace_Op == fRegionOp) {
+        if (coveragePOI.isSolidWhite()) {
+            output->fBlendedColor = GrColor_WHITE;
+            output->fBlendedColorFlags = kRGBA_GrColorComponentFlags;
+        } else {
+            output->fBlendedColorFlags = 0;
+        }
 
-    bool opaque = SkRegion::kReplace_Op == fRegionOp;
-    if (solidColor) {
-        if (opaque) {
-            *solidColor = GrColor_WHITE;
-            *solidColorKnownComponents = kRGBA_GrColorComponentFlags;
+        if (coveragePOI.readsDst()) {
+            output->fWillBlendWithDst = true;
         } else {
-            solidColorKnownComponents = 0;
+            output->fWillBlendWithDst = false;
         }
+    } else {
+        output->fBlendedColorFlags = 0;
+        output->fWillBlendWithDst = true;
     }
-    return opaque;
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrCoverageSetOpXPFactory);