Make SkPicture/SkImageGenerator default to SkCodec

tools/LazyDecodeBitmap.cpp

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "LazyDecodeBitmap.h"
-
-#include "SkData.h"
-#include "SkDiscardableMemoryPool.h"
-#include "SkImageGeneratorPriv.h"
-#include "SkForceLinking.h"
-
-#include "SkCommandLineFlags.h"
-
-__SK_FORCE_IMAGE_DECODER_LINKING;
-
-DEFINE_bool(useVolatileCache, false, "Use a volatile cache for deferred image decoding pixels. "
-            "Only meaningful if --deferImageDecoding is set to true and the platform has an "
-            "implementation.");
-
-//  Fits SkPicture::InstallPixelRefProc call signature.
-//  Used in SkPictureData::CreateFromStream
-bool sk_tools::LazyDecodeBitmap(const void* src, size_t length, SkBitmap* dst) {
-    SkAutoDataUnref data(SkData::NewWithCopy(src, length));
-    if (nullptr == data.get()) {
-        return false;
-    }
-
-    SkAutoTDelete<SkImageGenerator> gen(SkImageGenerator::NewFromEncoded(data));
-    if (nullptr == gen.get()) {
-        return false;
-    }
-    const SkImageInfo info = gen->getInfo();
-    SkDiscardableMemory::Factory* pool = nullptr;
-    if ((!FLAGS_useVolatileCache) || (info.width() * info.height() < 32 * 1024)) {
-        // how to do switching with SkDiscardableMemory.
-        pool = SkGetGlobalDiscardableMemoryPool();
-        // Only meaningful if platform has a default discardable
-        // memory implementation that differs from the global DM pool.
-    }
-    return SkDEPRECATED_InstallDiscardablePixelRef(gen.detach(), nullptr, dst, pool);
-}