[WIP] Add Context to SkDrawLooper.

tests/QuickRejectTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkDrawLooper.h"
+#include "SkTypes.h"
 #include "Test.h"
 
 /*
  *  Subclass of looper that just draws once, with an offset in X.
  */
 class TestLooper : public SkDrawLooper {
 public:
-    bool fOnce;
 
-    virtual void init(SkCanvas*) SK_OVERRIDE {
-        fOnce = true;
+    virtual SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE {
+        return SkNEW_PLACEMENT(storage, TestDrawLooperContext);
     }
 
-    virtual bool next(SkCanvas* canvas, SkPaint*) SK_OVERRIDE {
-        if (fOnce) {
-            fOnce = false;
-            canvas->translate(SkIntToScalar(10), 0);
-            return true;
-        }
-        return false;
-    }
+    virtual size_t contextSize() const SK_OVERRIDE { return sizeof(TestDrawLooperContext); }
 
 #ifdef SK_DEVELOPER
     virtual void toString(SkString* str) const SK_OVERRIDE {
         str->append("TestLooper:");
     }
 #endif
 
+private:
+    class TestDrawLooperContext : public SkDrawLooper::Context {
+    public:
+        TestDrawLooperContext() : fOnce(true) {}
+        virtual ~TestDrawLooperContext() {}
+
+        virtual bool next(SkCanvas* canvas, SkPaint*) SK_OVERRIDE {
+            if (fOnce) {
+                fOnce = false;
+                canvas->translate(SkIntToScalar(10), 0);
+                return true;
+            }
+            return false;
+        }
+    private:
+        bool fOnce;
+    };
+
     SK_DECLARE_UNFLATTENABLE_OBJECT()
 };
 
 static void test_drawBitmap(skiatest::Reporter* reporter) {
     SkBitmap src;
     src.allocN32Pixels(10, 10);
     src.eraseColor(SK_ColorWHITE);
 
     SkBitmap dst;
     dst.allocN32Pixels(10, 10);
@@ skipping 22 matching lines @@
     // allows us through, even though sans-looper we would look like we should
     // be clipped out.
     paint.setLooper(new TestLooper)->unref();
     canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
     REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
 }
 
 DEF_TEST(QuickReject, reporter) {
     test_drawBitmap(reporter);
 }