SkTaskGroup::batch(fn, args, N)

Porting QuiltTask isn't important in itself; this is mostly an API feeler.

BUG=skia:

Review URL: https://codereview.chromium.org/689673003

1 files changed, 13 insertions, 1 deletions

diff --git a/src/core/SkTaskGroup.h b/src/core/SkTaskGroup.h
index 75443c37cb..14a52c6aac 100644
--- a/src/core/SkTaskGroup.h
+++ b/src/core/SkTaskGroup.h
@@ -26,13 +26,25 @@ public:
     // Add a task to this SkTaskGroup.  It will likely run on another thread.
     // Neither add() method takes owership of any of its parameters.
     void add(SkRunnable*);
-    void add(void (*fn)(void*), void* arg);
+
+    template <typename T>
+    void add(void (*fn)(T*), T* arg) { this->add((void_fn)fn, (void*)arg); }
+
+    // Add a batch of N tasks, all calling fn with different arguments.
+    // Equivalent to a loop over add(fn, arg), but with perhaps less synchronization overhead.
+    template <typename T>
+    void batch(void (*fn)(T*), T* args, int N) { this->batch((void_fn)fn, args, N, sizeof(T)); }
 
     // Block until all Tasks previously add()ed to this SkTaskGroup have run.
     // You may safely reuse this SkTaskGroup after wait() returns.
     void wait();
 
 private:
+    typedef void(*void_fn)(void*);
+
+    void add  (void_fn, void* arg);
+    void batch(void_fn, void* args, int N, size_t stride);
+
     /*atomic*/ int32_t fPending;
 };