From bcede394ee5e1b5d10dbb149d69a3ad8b8f2cd3c Mon Sep 17 00:00:00 2001
From: "bsalomon@google.com"
 <bsalomon@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Wed, 23 Jan 2013 18:29:21 +0000
Subject: Add GrDrawState::DeferredState for saving GrDrawStates in
 GrInOrderDrawBuffer.

A future CL will do the unref'ing of GrResources when converting a GrDrawState to a DeferredState.
Review URL: https://codereview.appspot.com/7181049

git-svn-id: http://skia.googlecode.com/svn/trunk@7342 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 include/gpu/GrEffectStage.h | 58 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

(limited to 'include/gpu/GrEffectStage.h')

diff --git a/include/gpu/GrEffectStage.h b/include/gpu/GrEffectStage.h
index c09cd450a7..b561aaac25 100644
--- a/include/gpu/GrEffectStage.h
+++ b/include/gpu/GrEffectStage.h
@@ -20,7 +20,6 @@
 
 class GrEffectStage {
 public:
-
     GrEffectStage()
     : fEffectRef (NULL) {
         GR_DEBUGCODE(fSavedCoordChangeCnt = 0;)
@@ -95,6 +94,63 @@ public:
         GR_DEBUGCODE(savedCoordChange.fEffectRef.reset(NULL);)
     }
 
+    /**
+     * Used when storing a deferred GrDrawState. The DeferredStage allows resources owned by its
+     * GrEffect to be recycled through the cache.
+     */
+    class DeferredStage {
+    public:
+        DeferredStage() : fEffect(NULL) {
+            SkDEBUGCODE(fInitialized = false;)
+        }
+
+        void saveFrom(const GrEffectStage& stage) {
+            GrAssert(!fInitialized);
+            if (NULL != stage.fEffectRef) {
+                stage.fEffectRef->get()->addRef();
+                fEffect = stage.fEffectRef->get();
+                fCoordChangeMatrix = stage.fCoordChangeMatrix;
+            }
+            SkDEBUGCODE(fInitialized = true;)
+        }
+
+        void restoreTo(GrEffectStage* stage) {
+            GrAssert(fInitialized);
+            const GrEffectRef* oldEffectRef = stage->fEffectRef;
+            if (NULL != fEffect) {
+                stage->fEffectRef = GrEffect::CreateEffectRef(fEffect);
+                stage->fCoordChangeMatrix = fCoordChangeMatrix;
+            } else {
+                stage->fEffectRef = NULL;
+            }
+            SkSafeUnref(oldEffectRef);
+        }
+
+        bool isEqual(const GrEffectStage& stage) const {
+            if (NULL == stage.fEffectRef) {
+                return NULL == fEffect;
+            } else if (NULL == fEffect) {
+                return false;
+            }
+
+            if (!(*stage.getEffect())->isEqual(*fEffect)) {
+                return false;
+            }
+
+            return fCoordChangeMatrix == stage.fCoordChangeMatrix;
+        }
+
+        ~DeferredStage() {
+            if (NULL != fEffect) {
+                fEffect->subRef();
+            }
+        }
+    private:
+        const GrEffect*               fEffect;
+        SkMatrix                      fCoordChangeMatrix;
+        SkDEBUGCODE(bool fInitialized;)
+    };
+
     /**
      * Gets the matrix representing all changes of coordinate system since the GrEffect was
      * installed in the stage.
-- 
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