Revert of Move DstCopy on gpu into the GrXferProcessor. (patchset #11 id:200001 of https://codereview.chromium.org/885923002/)

Reason for revert:
Testing to see if reverting fixes 10.9 bots.

Original issue's description:
> Move DstCopy on gpu into the GrXferProcessor.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/74a11753604768bf461b80cabb66060e8564d82c
>
> Committed: https://skia.googlesource.com/skia/+/5e1378d0e075a323144ba14e0a4cbcca35eccc69

TBR=joshualitt@google.com,egdaniel@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/901663007

1 files changed, 17 insertions, 0 deletions

diff --git a/src/gpu/GrProgramDesc.h b/src/gpu/GrProgramDesc.h
index 66e0e06b8c..e07e116733 100644
--- a/src/gpu/GrProgramDesc.h
+++ b/src/gpu/GrProgramDesc.h
@@ -55,6 +55,9 @@ public:
     }
 
     struct KeyHeader {
+        uint8_t                     fDstReadKey;   // set by GrGLShaderBuilder if there
+                                                   // are effects that must read the dst.
+                                                   // Otherwise, 0.
         uint8_t                     fFragPosKey;   // set by GrGLShaderBuilder if there are
                                                    // effects that read the fragment position.
                                                    // Otherwise, 0.
@@ -76,6 +79,20 @@ public:
     // This should really only be used internally, base classes should return their own headers
     const KeyHeader& header() const { return *this->atOffset<KeyHeader, kHeaderOffset>(); }
 
+    // A struct to communicate descriptor information to the program descriptor builder
+    struct DescInfo {
+        bool operator==(const DescInfo& that) const {
+            return fReadsDst == that.fReadsDst &&
+                   fReadsFragPosition == that.fReadsFragPosition;
+        }
+        bool operator!=(const DescInfo& that) const { return !(*this == that); };
+
+        // These flags give aggregated info on the processor stages that are used when building
+        // programs.
+        bool            fReadsDst;
+        bool            fReadsFragPosition;
+    };
+
 private:
     template<typename T, size_t OFFSET> T* atOffset() {
         return reinterpret_cast<T*>(reinterpret_cast<intptr_t>(fKey.begin()) + OFFSET);