SkCachingPixelRef to use SkImageGenerator

src/lazy/SkLazyCachingPixelRef.h

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkLazyCachingPixelRef_DEFINED
-#define SkLazyCachingPixelRef_DEFINED
-
-#include "SkBitmapFactory.h"
-#include "SkCachingPixelRef.h"
-
-class SkData;
-
-/**
- *  PixelRef which defers decoding until SkBitmap::lockPixels() is
- *  called.  Makes use of a supplied decode procedure.  Will decode at
- *  the procedure's preferred size.
- */
-class SkLazyCachingPixelRef : public SkCachingPixelRef {
-public:
-    /**
-     *  @param data Encoded data representing the pixels.  NULL is
-     *         equivalent to an empty data, and will be passed to
-     *         DecodeProc with length zero.
-     *
-     *  @param procedure Called to decode the pixels when
-     *         needed. If NULL, use SkImageDecoder::DecodeMemoryToTarget.
-     */
-    SkLazyCachingPixelRef(SkData* data,
-                          SkBitmapFactory::DecodeProc procedure);
-
-    virtual ~SkLazyCachingPixelRef();
-
-    virtual SkData* onRefEncodedData() SK_OVERRIDE { return SkSafeRef(fData); }
-
-    /**
-     *  A simplified version of SkBitmapFactory.  Installs a new
-     *  SkLazyCachingPixelRef into the provided bitmap.  Will
-     *  immediately call onDecodeInfo() to configure the bitmap, but
-     *  will defer decoding until the first time the bitmap's pixels
-     *  are locked.
-     *
-     *  @param data Encoded data representing the pixels.  NULL is
-     *         equivalent to an empty data, and will be passed to
-     *         DecodeProc with length zero.
-     *
-     *  @param procedure Called to decode the pixels when
-     *         needed. If NULL, use SkImageDecoder::DecodeMemoryToTarget.
-     *
-     *  @param destination Bitmap that will be modified on success.
-     *
-     *  @returns true on success.
-     */
-    static bool Install(SkBitmapFactory::DecodeProc procedure,
-                        SkData* data,
-                        SkBitmap* destination);
-
-    // No need to flatten this object. When flattening an SkBitmap,
-    // SkOrderedWriteBuffer will check the encoded data and write that
-    // instead.
-    // Future implementations of SkFlattenableWriteBuffer will need to
-    // special case for onRefEncodedData as well.
-    SK_DECLARE_UNFLATTENABLE_OBJECT()
-
-protected:
-    /**
-     *  Return some information about the pixels, allowing this class
-     *  to allocate pixels.  @return false if anything goes wrong.
-     *
-     *  This implementation calls SkBitmapFactory::DecodeProc with a
-     *  NULL target.
-     */
-    virtual bool onDecodeInfo(SkImageInfo* info) SK_OVERRIDE;
-    /**
-     *  Decode into the given pixels, a block of memory of size
-     *  (info.fHeight * rowBytes) bytes.
-     *
-     *  @param info Should be identical to the info returned by
-     *         onDecodeInfo so that the implementation can confirm
-     *         that the caller knows what its asking for (config,
-     *         size).
-     *
-     *  @return false if anything goes wrong.
-     */
-    virtual bool onDecodePixels(const SkImageInfo& info,
-                                void* pixels,
-                                size_t rowBytes) SK_OVERRIDE;
-
-private:
-    SkData*                     fData;
-    SkBitmapFactory::DecodeProc fDecodeProc;
-
-    typedef SkCachingPixelRef INHERITED;
-};
-
-#endif  // SkLazyCachingPixelRef_DEFINED