[WIP] Add Context to SkDrawLooper.

src/effects/SkBlurDrawLooper.cpp

Index: src/effects/SkBlurDrawLooper.cpp
diff --git a/src/effects/SkBlurDrawLooper.cpp b/src/effects/SkBlurDrawLooper.cpp
index 3a5c6973715704d837222ef77fb1a1670a9e91a9..7bc42073ec57196d0592939fc49e5aca6be8a528 100644
--- a/src/effects/SkBlurDrawLooper.cpp
+++ b/src/effects/SkBlurDrawLooper.cpp
@@ -33,7 +33,6 @@ void SkBlurDrawLooper::init(SkScalar sigma, SkScalar dx, SkScalar dy,
     fDy = dy;
     fBlurColor = color;
     fBlurFlags = flags;
-    fState = kDone;
 
     SkASSERT(flags <= kAll_BlurFlag);
     if (sigma > 0) {
@@ -90,16 +89,20 @@ void SkBlurDrawLooper::flatten(SkWriteBuffer& buffer) const {
     buffer.writeUInt(fBlurFlags);
 }
 
-void SkBlurDrawLooper::init(SkCanvas*) {
-    fState = kBeforeEdge;
+SkDrawLooper::DrawContext* SkBlurDrawLooper::init(SkCanvas*) const {
+    return new SkBlurDrawLooperContext;

[scroggo, 2014/02/06 17:57:13]

SkNEW

 }
 
-bool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
-    switch (fState) {
+bool SkBlurDrawLooper::next_internal(SkCanvas* canvas, SkPaint* paint,
+                                     SkDrawLooper::DrawContext* context) {
+    SkBlurDrawLooperContext* blurContext =
+        static_cast<SkBlurDrawLooperContext*>(context);
+
+    switch (blurContext->fState) {
         case kBeforeEdge:
             // we do nothing if a maskfilter is already installed
             if (paint->getMaskFilter()) {
-                fState = kDone;
+                blurContext->fState = kDone;
                 return false;
             }
 #ifdef SK_BUILD_FOR_ANDROID
@@ -122,18 +125,21 @@ bool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
             } else {
                 canvas->translate(fDx, fDy);
             }
-            fState = kAfterEdge;
+            blurContext->fState = kAfterEdge;
             return true;
         case kAfterEdge:
             canvas->restore();
-            fState = kDone;
+            blurContext->fState = kDone;
             return true;
         default:
-            SkASSERT(kDone == fState);
+            SkASSERT(kDone == blurContext->fState);
             return false;
     }
 }
 
+SkBlurDrawLooper::SkBlurDrawLooperContext::SkBlurDrawLooperContext()
+    : fState(SkBlurDrawLooper::kBeforeEdge) {}
+
 #ifdef SK_DEVELOPER
 void SkBlurDrawLooper::toString(SkString* str) const {
     str->append("SkBlurDrawLooper: ");