Interlaced gifs without the iterator

src/codec/SkGifInterlaceIter.h

-/*
- * Copyright 2015 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkTypes.h"
-
-/*
- * Helper class to determine the destination y-values for interlaced gifs
- */
-class SkGifInterlaceIter : SkNoncopyable {
-public:
-
-    explicit SkGifInterlaceIter(int32_t height);
-
-    /*
-     * Get the next destination y-value
-     */
-    int32_t nextY();
-
-private:
-
-    /*
-     * Updates the iterator to prepare the next y-value
-     */
-    void prepareY();
-
-    const int32_t fHeight;
-    int32_t        fCurrY;
-    int32_t        fDeltaY;
-    const uint8_t* fStartYPtr;
-    const uint8_t* fDeltaYPtr;
-};