Trim the copy of the dst made for dst-reading effects using the clip and dev-bounds of draw.

Adds dev bounds to circles and rects drawn by GrDrawTarget base class (GrIODB already provides rect bounds).

Author: bsalomon@google.com

Reviewed By: robertphilips@google.com,jvanverth@google.com,robertphillips@google.com

Review URL: https://chromiumcodereview.appspot.com/13222004

git-svn-id: http://skia.googlecode.com/svn/trunk@8453 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 12 insertions, 0 deletions

diff --git a/src/gpu/GrDrawState.h b/src/gpu/GrDrawState.h
index 002c4ede34..d16efa893c 100644
--- a/src/gpu/GrDrawState.h
+++ b/src/gpu/GrDrawState.h
@@ -507,6 +507,18 @@ public:
             }
         }
     }
+    
+    /**
+     * Checks whether any of the effects will read the dst pixel color.
+     */
+    bool willEffectReadDst() const {
+        for (int s = 0; s < kNumStages; ++s) {
+            if (this->isStageEnabled(s) && (*this->getStage(s).getEffect())->willReadDst()) {
+                return true;
+            }
+        }
+        return false;
+    }
 
     /// @}