[WIP] Add Context to SkDrawLooper.

SkDrawLooper carries some state during draws. This CL extracts this state into
a separate class Context, which is then passed by the users of SkDrawLooper
into the appropriate methods.
This is a step towards making SkDrawLooper immutable.

BUG=skia:2141
R=scroggo@google.com, reed@google.com, sugoi@google.com

Author: dominikg@chromium.org

Review URL: https://codereview.chromium.org/155513012

git-svn-id: http://skia.googlecode.com/svn/trunk@13760 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 22 insertions, 11 deletions

diff --git a/tests/QuickRejectTest.cpp b/tests/QuickRejectTest.cpp
index 2d367389bb..ef145525e9 100644
--- a/tests/QuickRejectTest.cpp
+++ b/tests/QuickRejectTest.cpp
@@ -7,6 +7,7 @@
 
 #include "SkCanvas.h"
 #include "SkDrawLooper.h"
+#include "SkTypes.h"
 #include "Test.h"
 
 /*
@@ -14,20 +15,12 @@
  */
 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 {
@@ -35,6 +28,24 @@ public:
     }
 #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()
 };