1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "LazyDecodeBitmap.h"
9
10#include "SkData.h"
11#include "SkDecodingImageGenerator.h"
12#include "SkDiscardableMemoryPool.h"
13#include "SkImageGeneratorPriv.h"
14#include "SkForceLinking.h"
15
16#include "SkCommandLineFlags.h"
17
18__SK_FORCE_IMAGE_DECODER_LINKING;
19
20DEFINE_bool(useVolatileCache, false, "Use a volatile cache for deferred image decoding pixels. "
21            "Only meaningful if --deferImageDecoding is set to true and the platform has an "
22            "implementation.");
23
24//  Fits SkPicture::InstallPixelRefProc call signature.
25//  Used in SkPicturePlayback::CreateFromStream
26bool sk_tools::LazyDecodeBitmap(const void* src,
27                                size_t length,
28                                SkBitmap* dst) {
29    SkAutoDataUnref data(SkData::NewWithCopy(src, length));
30    if (NULL == data.get()) {
31        return false;
32    }
33
34    SkAutoTDelete<SkImageGenerator> gen(
35        SkDecodingImageGenerator::Create(
36            data, SkDecodingImageGenerator::Options()));
37    SkImageInfo info;
38    if ((NULL == gen.get()) || !gen->getInfo(&info)) {
39        return false;
40    }
41    SkDiscardableMemory::Factory* pool = NULL;
42    if ((!FLAGS_useVolatileCache) || (info.fWidth * info.fHeight < 32 * 1024)) {
43        // how to do switching with SkDiscardableMemory.
44        pool = SkGetGlobalDiscardableMemoryPool();
45        // Only meaningful if platform has a default discardable
46        // memory implementation that differs from the global DM pool.
47    }
48    return SkInstallDiscardablePixelRef(gen.detach(), dst, pool);
49}
50